Mike Frysinger | 9849ed4 | 2010-07-20 03:13:35 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Ftrace header. For implementation details beyond the random comments |
| 3 | * scattered below, see: Documentation/trace/ftrace-design.txt |
| 4 | */ |
| 5 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 6 | #ifndef _LINUX_FTRACE_H |
| 7 | #define _LINUX_FTRACE_H |
| 8 | |
Frederic Weisbecker | 0012693 | 2009-03-05 01:49:22 +0100 | [diff] [blame] | 9 | #include <linux/trace_clock.h> |
Frederic Weisbecker | 5601020 | 2008-10-02 13:26:05 +0200 | [diff] [blame] | 10 | #include <linux/kallsyms.h> |
Frederic Weisbecker | 0012693 | 2009-03-05 01:49:22 +0100 | [diff] [blame] | 11 | #include <linux/linkage.h> |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 12 | #include <linux/bitops.h> |
Steven Rostedt | a1e2e31 | 2011-08-09 12:50:46 -0400 | [diff] [blame] | 13 | #include <linux/ptrace.h> |
Frederic Weisbecker | 0012693 | 2009-03-05 01:49:22 +0100 | [diff] [blame] | 14 | #include <linux/ktime.h> |
Frederic Weisbecker | 21a8c46 | 2008-12-04 23:51:23 +0100 | [diff] [blame] | 15 | #include <linux/sched.h> |
Frederic Weisbecker | 0012693 | 2009-03-05 01:49:22 +0100 | [diff] [blame] | 16 | #include <linux/types.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/fs.h> |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 19 | |
Uwe Kleine-Koenig | c79a61f | 2009-02-27 21:30:03 +0100 | [diff] [blame] | 20 | #include <asm/ftrace.h> |
| 21 | |
Steven Rostedt | 2f5f6ad | 2011-08-08 16:57:47 -0400 | [diff] [blame] | 22 | /* |
| 23 | * If the arch supports passing the variable contents of |
| 24 | * function_trace_op as the third parameter back from the |
| 25 | * mcount call, then the arch should define this as 1. |
| 26 | */ |
| 27 | #ifndef ARCH_SUPPORTS_FTRACE_OPS |
| 28 | #define ARCH_SUPPORTS_FTRACE_OPS 0 |
| 29 | #endif |
| 30 | |
Steven Rostedt | ccf3672 | 2012-06-05 09:44:25 -0400 | [diff] [blame] | 31 | /* |
| 32 | * If the arch's mcount caller does not support all of ftrace's |
| 33 | * features, then it must call an indirect function that |
| 34 | * does. Or at least does enough to prevent any unwelcomed side effects. |
| 35 | */ |
Steven Rostedt (Red Hat) | 7544256a | 2014-06-25 13:26:59 -0400 | [diff] [blame] | 36 | #if !ARCH_SUPPORTS_FTRACE_OPS |
Steven Rostedt | ccf3672 | 2012-06-05 09:44:25 -0400 | [diff] [blame] | 37 | # define FTRACE_FORCE_LIST_FUNC 1 |
| 38 | #else |
| 39 | # define FTRACE_FORCE_LIST_FUNC 0 |
| 40 | #endif |
| 41 | |
Steven Rostedt (Red Hat) | 5f893b2 | 2014-12-12 20:05:10 -0500 | [diff] [blame] | 42 | /* Main tracing buffer and events set up */ |
| 43 | #ifdef CONFIG_TRACING |
| 44 | void trace_init(void); |
| 45 | #else |
| 46 | static inline void trace_init(void) { } |
| 47 | #endif |
Steven Rostedt | ccf3672 | 2012-06-05 09:44:25 -0400 | [diff] [blame] | 48 | |
Paul Gortmaker | de47725 | 2011-05-26 13:46:22 -0400 | [diff] [blame] | 49 | struct module; |
Steven Rostedt | 04da85b | 2011-07-11 10:12:59 -0400 | [diff] [blame] | 50 | struct ftrace_hash; |
| 51 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 52 | #ifdef CONFIG_FUNCTION_TRACER |
Ingo Molnar | 3e1932a | 2008-10-02 17:45:47 +0200 | [diff] [blame] | 53 | |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 54 | extern int ftrace_enabled; |
| 55 | extern int |
| 56 | ftrace_enable_sysctl(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 57 | void __user *buffer, size_t *lenp, |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 58 | loff_t *ppos); |
| 59 | |
Steven Rostedt | 2f5f6ad | 2011-08-08 16:57:47 -0400 | [diff] [blame] | 60 | struct ftrace_ops; |
| 61 | |
| 62 | typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, |
Steven Rostedt | a1e2e31 | 2011-08-09 12:50:46 -0400 | [diff] [blame] | 63 | struct ftrace_ops *op, struct pt_regs *regs); |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 64 | |
Steven Rostedt (Red Hat) | 8735405 | 2014-07-22 20:41:42 -0400 | [diff] [blame] | 65 | ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops); |
| 66 | |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 67 | /* |
| 68 | * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are |
| 69 | * set in the flags member. |
Masami Hiramatsu | f8b8be8 | 2014-11-21 05:25:16 -0500 | [diff] [blame] | 70 | * CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION_SAFE, STUB and |
| 71 | * IPMODIFY are a kind of attribute flags which can be set only before |
| 72 | * registering the ftrace_ops, and can not be modified while registered. |
| 73 | * Changing those attribute flags after regsitering ftrace_ops will |
| 74 | * cause unexpected results. |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 75 | * |
| 76 | * ENABLED - set/unset when ftrace_ops is registered/unregistered |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 77 | * DYNAMIC - set when ftrace_ops is registered to denote dynamically |
| 78 | * allocated ftrace_ops which need special care |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 79 | * PER_CPU - set manualy by ftrace_ops user to denote the ftrace_ops |
| 80 | * could be controlled by following calls: |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 81 | * ftrace_function_local_enable |
| 82 | * ftrace_function_local_disable |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 83 | * SAVE_REGS - The ftrace_ops wants regs saved at each function called |
| 84 | * and passed to the callback. If this flag is set, but the |
| 85 | * architecture does not support passing regs |
Masami Hiramatsu | 06aeaae | 2012-09-28 17:15:17 +0900 | [diff] [blame] | 86 | * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 87 | * ftrace_ops will fail to register, unless the next flag |
| 88 | * is set. |
| 89 | * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the |
| 90 | * handler can handle an arch that does not save regs |
| 91 | * (the handler tests if regs == NULL), then it can set |
| 92 | * this flag instead. It will not fail registering the ftrace_ops |
| 93 | * but, the regs field will be NULL if the arch does not support |
| 94 | * passing regs to the handler. |
| 95 | * Note, if this flag is set, the SAVE_REGS flag will automatically |
| 96 | * get set upon registering the ftrace_ops, if the arch supports it. |
Steven Rostedt | 4740974 | 2012-07-20 11:04:44 -0400 | [diff] [blame] | 97 | * RECURSION_SAFE - The ftrace_ops can set this to tell the ftrace infrastructure |
| 98 | * that the call back has its own recursion protection. If it does |
| 99 | * not set this, then the ftrace infrastructure will add recursion |
| 100 | * protection for the caller. |
Steven Rostedt (Red Hat) | 395b97a | 2013-03-27 09:31:28 -0400 | [diff] [blame] | 101 | * STUB - The ftrace_ops is just a place holder. |
Masami Hiramatsu | f04f24fb | 2013-05-09 14:44:17 +0900 | [diff] [blame] | 102 | * INITIALIZED - The ftrace_ops has already been initialized (first use time |
| 103 | * register_ftrace_function() is called, it will initialized the ops) |
Steven Rostedt (Red Hat) | 591dffd | 2014-01-10 16:17:45 -0500 | [diff] [blame] | 104 | * DELETED - The ops are being deleted, do not let them be registered again. |
Steven Rostedt (Red Hat) | e1effa0 | 2014-08-05 17:19:38 -0400 | [diff] [blame] | 105 | * ADDING - The ops is in the process of being added. |
| 106 | * REMOVING - The ops is in the process of being removed. |
| 107 | * MODIFYING - The ops is in the process of changing its filter functions. |
Steven Rostedt (Red Hat) | f3bea49 | 2014-07-02 23:23:31 -0400 | [diff] [blame] | 108 | * ALLOC_TRAMP - A dynamic trampoline was allocated by the core code. |
| 109 | * The arch specific code sets this flag when it allocated a |
| 110 | * trampoline. This lets the arch know that it can update the |
| 111 | * trampoline in case the callback function changes. |
| 112 | * The ftrace_ops trampoline can be set by the ftrace users, and |
| 113 | * in such cases the arch must not modify it. Only the arch ftrace |
| 114 | * core code should set this flag. |
Masami Hiramatsu | f8b8be8 | 2014-11-21 05:25:16 -0500 | [diff] [blame] | 115 | * IPMODIFY - The ops can modify the IP register. This can only be set with |
| 116 | * SAVE_REGS. If another ops with this flag set is already registered |
| 117 | * for any of the functions that this ops will be registered for, then |
| 118 | * this ops will fail to register or set_filter_ip. |
Steven Rostedt (Red Hat) | e3eea14 | 2015-07-24 10:38:12 -0400 | [diff] [blame] | 119 | * PID - Is affected by set_ftrace_pid (allows filtering on those pids) |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 120 | */ |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 121 | enum { |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 122 | FTRACE_OPS_FL_ENABLED = 1 << 0, |
Steven Rostedt (Red Hat) | 4104d32 | 2014-01-10 17:01:58 -0500 | [diff] [blame] | 123 | FTRACE_OPS_FL_DYNAMIC = 1 << 1, |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 124 | FTRACE_OPS_FL_PER_CPU = 1 << 2, |
Steven Rostedt (Red Hat) | 4104d32 | 2014-01-10 17:01:58 -0500 | [diff] [blame] | 125 | FTRACE_OPS_FL_SAVE_REGS = 1 << 3, |
| 126 | FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = 1 << 4, |
| 127 | FTRACE_OPS_FL_RECURSION_SAFE = 1 << 5, |
| 128 | FTRACE_OPS_FL_STUB = 1 << 6, |
| 129 | FTRACE_OPS_FL_INITIALIZED = 1 << 7, |
| 130 | FTRACE_OPS_FL_DELETED = 1 << 8, |
Steven Rostedt (Red Hat) | e1effa0 | 2014-08-05 17:19:38 -0400 | [diff] [blame] | 131 | FTRACE_OPS_FL_ADDING = 1 << 9, |
| 132 | FTRACE_OPS_FL_REMOVING = 1 << 10, |
| 133 | FTRACE_OPS_FL_MODIFYING = 1 << 11, |
Steven Rostedt (Red Hat) | f3bea49 | 2014-07-02 23:23:31 -0400 | [diff] [blame] | 134 | FTRACE_OPS_FL_ALLOC_TRAMP = 1 << 12, |
Masami Hiramatsu | f8b8be8 | 2014-11-21 05:25:16 -0500 | [diff] [blame] | 135 | FTRACE_OPS_FL_IPMODIFY = 1 << 13, |
Steven Rostedt (Red Hat) | e3eea14 | 2015-07-24 10:38:12 -0400 | [diff] [blame] | 136 | FTRACE_OPS_FL_PID = 1 << 14, |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 137 | FTRACE_OPS_FL_RCU = 1 << 15, |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 138 | }; |
| 139 | |
Steven Rostedt (Red Hat) | 33b7f99 | 2014-08-15 17:23:02 -0400 | [diff] [blame] | 140 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 141 | /* The hash used to know what functions callbacks trace */ |
| 142 | struct ftrace_ops_hash { |
| 143 | struct ftrace_hash *notrace_hash; |
| 144 | struct ftrace_hash *filter_hash; |
| 145 | struct mutex regex_lock; |
| 146 | }; |
| 147 | #endif |
| 148 | |
Steven Rostedt (Red Hat) | b7e00a6 | 2013-11-07 09:36:25 -0500 | [diff] [blame] | 149 | /* |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 150 | * Note, ftrace_ops can be referenced outside of RCU protection, unless |
| 151 | * the RCU flag is set. If ftrace_ops is allocated and not part of kernel |
| 152 | * core data, the unregistering of it will perform a scheduling on all CPUs |
| 153 | * to make sure that there are no more users. Depending on the load of the |
| 154 | * system that may take a bit of time. |
Steven Rostedt (Red Hat) | b7e00a6 | 2013-11-07 09:36:25 -0500 | [diff] [blame] | 155 | * |
| 156 | * Any private data added must also take care not to be freed and if private |
| 157 | * data is added to a ftrace_ops that is in core code, the user of the |
| 158 | * ftrace_ops must perform a schedule_on_each_cpu() before freeing it. |
| 159 | */ |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 160 | struct ftrace_ops { |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 161 | ftrace_func_t func; |
| 162 | struct ftrace_ops *next; |
Steven Rostedt | b848914 | 2011-05-04 09:27:52 -0400 | [diff] [blame] | 163 | unsigned long flags; |
Steven Rostedt (Red Hat) | b7e00a6 | 2013-11-07 09:36:25 -0500 | [diff] [blame] | 164 | void *private; |
Steven Rostedt (Red Hat) | e3eea14 | 2015-07-24 10:38:12 -0400 | [diff] [blame] | 165 | ftrace_func_t saved_func; |
Steven Rostedt (Red Hat) | 79922b8 | 2014-05-06 21:56:17 -0400 | [diff] [blame] | 166 | int __percpu *disabled; |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 167 | #ifdef CONFIG_DYNAMIC_FTRACE |
Steven Rostedt (Red Hat) | 33b7f99 | 2014-08-15 17:23:02 -0400 | [diff] [blame] | 168 | struct ftrace_ops_hash local_hash; |
| 169 | struct ftrace_ops_hash *func_hash; |
Steven Rostedt (Red Hat) | fef5aee | 2014-07-24 12:25:47 -0400 | [diff] [blame] | 170 | struct ftrace_ops_hash old_hash; |
Steven Rostedt (Red Hat) | 79922b8 | 2014-05-06 21:56:17 -0400 | [diff] [blame] | 171 | unsigned long trampoline; |
Steven Rostedt (Red Hat) | aec0be2 | 2014-11-18 21:14:11 -0500 | [diff] [blame] | 172 | unsigned long trampoline_size; |
Steven Rostedt | f45948e | 2011-05-02 12:29:25 -0400 | [diff] [blame] | 173 | #endif |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 174 | }; |
| 175 | |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 176 | /* |
| 177 | * Type of the current tracing. |
| 178 | */ |
| 179 | enum ftrace_tracing_type_t { |
| 180 | FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */ |
| 181 | FTRACE_TYPE_RETURN, /* Hook the return of the function */ |
| 182 | }; |
| 183 | |
| 184 | /* Current tracing type, default is FTRACE_TYPE_ENTER */ |
| 185 | extern enum ftrace_tracing_type_t ftrace_tracing_type; |
| 186 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 187 | /* |
| 188 | * The ftrace_ops must be a static and should also |
| 189 | * be read_mostly. These functions do modify read_mostly variables |
| 190 | * so use them sparely. Never free an ftrace_op or modify the |
| 191 | * next pointer after it has been registered. Even after unregistering |
| 192 | * it, the next pointer may still be used internally. |
| 193 | */ |
| 194 | int register_ftrace_function(struct ftrace_ops *ops); |
| 195 | int unregister_ftrace_function(struct ftrace_ops *ops); |
| 196 | void clear_ftrace_function(void); |
| 197 | |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 198 | /** |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 199 | * ftrace_function_local_enable - enable ftrace_ops on current cpu |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 200 | * |
| 201 | * This function enables tracing on current cpu by decreasing |
| 202 | * the per cpu control variable. |
| 203 | * It must be called with preemption disabled and only on ftrace_ops |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 204 | * registered with FTRACE_OPS_FL_PER_CPU. If called without preemption |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 205 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. |
| 206 | */ |
| 207 | static inline void ftrace_function_local_enable(struct ftrace_ops *ops) |
| 208 | { |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 209 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU))) |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 210 | return; |
| 211 | |
| 212 | (*this_cpu_ptr(ops->disabled))--; |
| 213 | } |
| 214 | |
| 215 | /** |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 216 | * ftrace_function_local_disable - disable ftrace_ops on current cpu |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 217 | * |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 218 | * This function disables tracing on current cpu by increasing |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 219 | * the per cpu control variable. |
| 220 | * It must be called with preemption disabled and only on ftrace_ops |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 221 | * registered with FTRACE_OPS_FL_PER_CPU. If called without preemption |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 222 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. |
| 223 | */ |
| 224 | static inline void ftrace_function_local_disable(struct ftrace_ops *ops) |
| 225 | { |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 226 | if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU))) |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 227 | return; |
| 228 | |
| 229 | (*this_cpu_ptr(ops->disabled))++; |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * ftrace_function_local_disabled - returns ftrace_ops disabled value |
| 234 | * on current cpu |
| 235 | * |
| 236 | * This function returns value of ftrace_ops::disabled on current cpu. |
| 237 | * It must be called with preemption disabled and only on ftrace_ops |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 238 | * registered with FTRACE_OPS_FL_PER_CPU. If called without preemption |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 239 | * disabled, this_cpu_ptr will complain when CONFIG_DEBUG_PREEMPT is enabled. |
| 240 | */ |
| 241 | static inline int ftrace_function_local_disabled(struct ftrace_ops *ops) |
| 242 | { |
Steven Rostedt (Red Hat) | ba27f2b | 2015-11-30 17:23:39 -0500 | [diff] [blame] | 243 | WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU)); |
Jiri Olsa | e248491 | 2012-02-15 15:51:48 +0100 | [diff] [blame] | 244 | return *this_cpu_ptr(ops->disabled); |
| 245 | } |
| 246 | |
Steven Rostedt | a1e2e31 | 2011-08-09 12:50:46 -0400 | [diff] [blame] | 247 | extern void ftrace_stub(unsigned long a0, unsigned long a1, |
| 248 | struct ftrace_ops *op, struct pt_regs *regs); |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 249 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 250 | #else /* !CONFIG_FUNCTION_TRACER */ |
Steven Rostedt | 4dbf6bc | 2010-05-04 11:24:01 -0400 | [diff] [blame] | 251 | /* |
| 252 | * (un)register_ftrace_function must be a macro since the ops parameter |
| 253 | * must not be evaluated. |
| 254 | */ |
| 255 | #define register_ftrace_function(ops) ({ 0; }) |
| 256 | #define unregister_ftrace_function(ops) ({ 0; }) |
Steven Rostedt | ea701f1 | 2012-07-20 13:08:05 -0400 | [diff] [blame] | 257 | static inline int ftrace_nr_registered_ops(void) |
| 258 | { |
| 259 | return 0; |
| 260 | } |
Steven Rostedt | 4dbf6bc | 2010-05-04 11:24:01 -0400 | [diff] [blame] | 261 | static inline void clear_ftrace_function(void) { } |
Steven Rostedt | 81adbdc | 2008-10-23 09:33:02 -0400 | [diff] [blame] | 262 | static inline void ftrace_kill(void) { } |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 263 | #endif /* CONFIG_FUNCTION_TRACER */ |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 264 | |
Steven Rostedt | f38f1d2 | 2008-12-16 23:06:40 -0500 | [diff] [blame] | 265 | #ifdef CONFIG_STACK_TRACER |
AKASHI Takahiro | bb99d8c | 2015-10-30 14:25:39 +0900 | [diff] [blame] | 266 | |
| 267 | #define STACK_TRACE_ENTRIES 500 |
| 268 | |
| 269 | struct stack_trace; |
| 270 | |
| 271 | extern unsigned stack_trace_index[]; |
| 272 | extern struct stack_trace stack_trace_max; |
| 273 | extern unsigned long stack_trace_max_size; |
Steven Rostedt (Red Hat) | d332736 | 2015-11-03 14:50:15 -0500 | [diff] [blame] | 274 | extern arch_spinlock_t stack_trace_max_lock; |
AKASHI Takahiro | bb99d8c | 2015-10-30 14:25:39 +0900 | [diff] [blame] | 275 | |
Steven Rostedt | f38f1d2 | 2008-12-16 23:06:40 -0500 | [diff] [blame] | 276 | extern int stack_tracer_enabled; |
AKASHI Takahiro | bb99d8c | 2015-10-30 14:25:39 +0900 | [diff] [blame] | 277 | void stack_trace_print(void); |
Steven Rostedt | f38f1d2 | 2008-12-16 23:06:40 -0500 | [diff] [blame] | 278 | int |
| 279 | stack_trace_sysctl(struct ctl_table *table, int write, |
Alexey Dobriyan | 8d65af7 | 2009-09-23 15:57:19 -0700 | [diff] [blame] | 280 | void __user *buffer, size_t *lenp, |
Steven Rostedt | f38f1d2 | 2008-12-16 23:06:40 -0500 | [diff] [blame] | 281 | loff_t *ppos); |
| 282 | #endif |
| 283 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 284 | struct ftrace_func_command { |
| 285 | struct list_head list; |
| 286 | char *name; |
Steven Rostedt | 43dd61c | 2011-07-07 11:09:22 -0400 | [diff] [blame] | 287 | int (*func)(struct ftrace_hash *hash, |
| 288 | char *func, char *cmd, |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 289 | char *params, int enable); |
| 290 | }; |
| 291 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 292 | #ifdef CONFIG_DYNAMIC_FTRACE |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 293 | |
Steven Rostedt | 000ab69 | 2009-02-17 13:35:06 -0500 | [diff] [blame] | 294 | int ftrace_arch_code_modify_prepare(void); |
| 295 | int ftrace_arch_code_modify_post_process(void); |
| 296 | |
Steven Rostedt (Red Hat) | 4fd3279 | 2014-10-24 17:56:04 -0400 | [diff] [blame] | 297 | struct dyn_ftrace; |
| 298 | |
Steven Rostedt (Red Hat) | 02a392a | 2015-11-25 12:50:47 -0500 | [diff] [blame] | 299 | enum ftrace_bug_type { |
| 300 | FTRACE_BUG_UNKNOWN, |
| 301 | FTRACE_BUG_INIT, |
| 302 | FTRACE_BUG_NOP, |
| 303 | FTRACE_BUG_CALL, |
| 304 | FTRACE_BUG_UPDATE, |
| 305 | }; |
| 306 | extern enum ftrace_bug_type ftrace_bug_type; |
| 307 | |
Steven Rostedt (Red Hat) | b05086c | 2015-11-25 14:13:11 -0500 | [diff] [blame] | 308 | /* |
| 309 | * Archs can set this to point to a variable that holds the value that was |
| 310 | * expected at the call site before calling ftrace_bug(). |
| 311 | */ |
| 312 | extern const void *ftrace_expected; |
| 313 | |
Steven Rostedt (Red Hat) | 4fd3279 | 2014-10-24 17:56:04 -0400 | [diff] [blame] | 314 | void ftrace_bug(int err, struct dyn_ftrace *rec); |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 315 | |
Steven Rostedt | 809dcf2 | 2009-02-16 23:06:01 -0500 | [diff] [blame] | 316 | struct seq_file; |
| 317 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 318 | struct ftrace_probe_ops { |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 319 | void (*func)(unsigned long ip, |
| 320 | unsigned long parent_ip, |
| 321 | void **data); |
Steven Rostedt (Red Hat) | e67efb9 | 2013-03-12 15:07:59 -0400 | [diff] [blame] | 322 | int (*init)(struct ftrace_probe_ops *ops, |
| 323 | unsigned long ip, void **data); |
| 324 | void (*free)(struct ftrace_probe_ops *ops, |
| 325 | unsigned long ip, void **data); |
Steven Rostedt | 809dcf2 | 2009-02-16 23:06:01 -0500 | [diff] [blame] | 326 | int (*print)(struct seq_file *m, |
| 327 | unsigned long ip, |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 328 | struct ftrace_probe_ops *ops, |
Steven Rostedt | 809dcf2 | 2009-02-16 23:06:01 -0500 | [diff] [blame] | 329 | void *data); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 330 | }; |
| 331 | |
| 332 | extern int |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 333 | register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 334 | void *data); |
| 335 | extern void |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 336 | unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 337 | void *data); |
| 338 | extern void |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 339 | unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops); |
| 340 | extern void unregister_ftrace_function_probe_all(char *glob); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 341 | |
Sasha Levin | d88471c | 2013-01-09 18:09:20 -0500 | [diff] [blame] | 342 | extern int ftrace_text_reserved(const void *start, const void *end); |
Masami Hiramatsu | 2cfa197 | 2010-02-02 16:49:11 -0500 | [diff] [blame] | 343 | |
Steven Rostedt | ea701f1 | 2012-07-20 13:08:05 -0400 | [diff] [blame] | 344 | extern int ftrace_nr_registered_ops(void); |
| 345 | |
Steven Rostedt (Red Hat) | aec0be2 | 2014-11-18 21:14:11 -0500 | [diff] [blame] | 346 | bool is_ftrace_trampoline(unsigned long addr); |
| 347 | |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 348 | /* |
| 349 | * The dyn_ftrace record's flags field is split into two parts. |
| 350 | * the first part which is '0-FTRACE_REF_MAX' is a counter of |
| 351 | * the number of callbacks that have registered the function that |
| 352 | * the dyn_ftrace descriptor represents. |
| 353 | * |
| 354 | * The second part is a mask: |
| 355 | * ENABLED - the function is being traced |
| 356 | * REGS - the record wants the function to save regs |
| 357 | * REGS_EN - the function is set up to save regs. |
Masami Hiramatsu | f8b8be8 | 2014-11-21 05:25:16 -0500 | [diff] [blame] | 358 | * IPMODIFY - the record allows for the IP address to be changed. |
Steven Rostedt (Red Hat) | b7ffffb | 2016-01-07 15:40:01 -0500 | [diff] [blame] | 359 | * DISABLED - the record is not ready to be touched yet |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 360 | * |
| 361 | * When a new ftrace_ops is registered and wants a function to save |
| 362 | * pt_regs, the rec->flag REGS is set. When the function has been |
| 363 | * set up to save regs, the REG_EN flag is set. Once a function |
| 364 | * starts saving regs it will do so until all ftrace_ops are removed |
| 365 | * from tracing that function. |
| 366 | */ |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 367 | enum { |
Steven Rostedt (Red Hat) | 79922b8 | 2014-05-06 21:56:17 -0400 | [diff] [blame] | 368 | FTRACE_FL_ENABLED = (1UL << 31), |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 369 | FTRACE_FL_REGS = (1UL << 30), |
Steven Rostedt (Red Hat) | 79922b8 | 2014-05-06 21:56:17 -0400 | [diff] [blame] | 370 | FTRACE_FL_REGS_EN = (1UL << 29), |
| 371 | FTRACE_FL_TRAMP = (1UL << 28), |
| 372 | FTRACE_FL_TRAMP_EN = (1UL << 27), |
Masami Hiramatsu | f8b8be8 | 2014-11-21 05:25:16 -0500 | [diff] [blame] | 373 | FTRACE_FL_IPMODIFY = (1UL << 26), |
Steven Rostedt (Red Hat) | b7ffffb | 2016-01-07 15:40:01 -0500 | [diff] [blame] | 374 | FTRACE_FL_DISABLED = (1UL << 25), |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 375 | }; |
| 376 | |
Steven Rostedt (Red Hat) | b7ffffb | 2016-01-07 15:40:01 -0500 | [diff] [blame] | 377 | #define FTRACE_REF_MAX_SHIFT 25 |
| 378 | #define FTRACE_FL_BITS 7 |
Steven Rostedt (Red Hat) | cf2cb0b | 2014-05-07 12:42:28 -0400 | [diff] [blame] | 379 | #define FTRACE_FL_MASKED_BITS ((1UL << FTRACE_FL_BITS) - 1) |
| 380 | #define FTRACE_FL_MASK (FTRACE_FL_MASKED_BITS << FTRACE_REF_MAX_SHIFT) |
| 381 | #define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1) |
Steven Rostedt | ed926f9 | 2011-05-03 13:25:24 -0400 | [diff] [blame] | 382 | |
Steven Rostedt (Red Hat) | 0376bde | 2014-05-07 13:46:45 -0400 | [diff] [blame] | 383 | #define ftrace_rec_count(rec) ((rec)->flags & ~FTRACE_FL_MASK) |
| 384 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 385 | struct dyn_ftrace { |
Jiri Slaby | a762782 | 2014-02-24 20:00:00 +0100 | [diff] [blame] | 386 | unsigned long ip; /* address of mcount call-site */ |
Steven Rostedt | 85ae32a | 2011-12-16 16:30:31 -0500 | [diff] [blame] | 387 | unsigned long flags; |
Jiri Slaby | a762782 | 2014-02-24 20:00:00 +0100 | [diff] [blame] | 388 | struct dyn_arch_ftrace arch; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 389 | }; |
| 390 | |
Steven Rostedt | e1c08bd | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 391 | int ftrace_force_update(void); |
Masami Hiramatsu | 647664e | 2012-06-05 19:28:08 +0900 | [diff] [blame] | 392 | int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip, |
| 393 | int remove, int reset); |
Jiri Olsa | ac483c4 | 2012-01-02 10:04:14 +0100 | [diff] [blame] | 394 | int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, |
Steven Rostedt | 936e074 | 2011-05-05 22:54:01 -0400 | [diff] [blame] | 395 | int len, int reset); |
Jiri Olsa | ac483c4 | 2012-01-02 10:04:14 +0100 | [diff] [blame] | 396 | int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, |
Steven Rostedt | 936e074 | 2011-05-05 22:54:01 -0400 | [diff] [blame] | 397 | int len, int reset); |
| 398 | void ftrace_set_global_filter(unsigned char *buf, int len, int reset); |
| 399 | void ftrace_set_global_notrace(unsigned char *buf, int len, int reset); |
Jiri Olsa | 5500fa5 | 2012-02-15 15:51:54 +0100 | [diff] [blame] | 400 | void ftrace_free_filter(struct ftrace_ops *ops); |
Steven Rostedt | e1c08bd | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 401 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 402 | int register_ftrace_command(struct ftrace_func_command *cmd); |
| 403 | int unregister_ftrace_command(struct ftrace_func_command *cmd); |
| 404 | |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 405 | enum { |
| 406 | FTRACE_UPDATE_CALLS = (1 << 0), |
| 407 | FTRACE_DISABLE_CALLS = (1 << 1), |
| 408 | FTRACE_UPDATE_TRACE_FUNC = (1 << 2), |
| 409 | FTRACE_START_FUNC_RET = (1 << 3), |
| 410 | FTRACE_STOP_FUNC_RET = (1 << 4), |
| 411 | }; |
| 412 | |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 413 | /* |
| 414 | * The FTRACE_UPDATE_* enum is used to pass information back |
| 415 | * from the ftrace_update_record() and ftrace_test_record() |
| 416 | * functions. These are called by the code update routines |
| 417 | * to find out what is to be done for a given function. |
| 418 | * |
| 419 | * IGNORE - The function is already what we want it to be |
| 420 | * MAKE_CALL - Start tracing the function |
| 421 | * MODIFY_CALL - Stop saving regs for the function |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 422 | * MAKE_NOP - Stop tracing the function |
| 423 | */ |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 424 | enum { |
| 425 | FTRACE_UPDATE_IGNORE, |
| 426 | FTRACE_UPDATE_MAKE_CALL, |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 427 | FTRACE_UPDATE_MODIFY_CALL, |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 428 | FTRACE_UPDATE_MAKE_NOP, |
| 429 | }; |
| 430 | |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 431 | enum { |
| 432 | FTRACE_ITER_FILTER = (1 << 0), |
| 433 | FTRACE_ITER_NOTRACE = (1 << 1), |
| 434 | FTRACE_ITER_PRINTALL = (1 << 2), |
Steven Rostedt | 69a3083 | 2011-12-19 15:21:16 -0500 | [diff] [blame] | 435 | FTRACE_ITER_DO_HASH = (1 << 3), |
| 436 | FTRACE_ITER_HASH = (1 << 4), |
| 437 | FTRACE_ITER_ENABLED = (1 << 5), |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 438 | }; |
| 439 | |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 440 | void arch_ftrace_update_code(int command); |
| 441 | |
| 442 | struct ftrace_rec_iter; |
| 443 | |
| 444 | struct ftrace_rec_iter *ftrace_rec_iter_start(void); |
| 445 | struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter); |
| 446 | struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter); |
| 447 | |
Steven Rostedt | 08d636b | 2011-08-16 09:57:10 -0400 | [diff] [blame] | 448 | #define for_ftrace_rec_iter(iter) \ |
| 449 | for (iter = ftrace_rec_iter_start(); \ |
| 450 | iter; \ |
| 451 | iter = ftrace_rec_iter_next(iter)) |
| 452 | |
| 453 | |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 454 | int ftrace_update_record(struct dyn_ftrace *rec, int enable); |
| 455 | int ftrace_test_record(struct dyn_ftrace *rec, int enable); |
| 456 | void ftrace_run_stop_machine(int command); |
Steven Rostedt | f0cf973 | 2012-04-25 14:39:54 -0400 | [diff] [blame] | 457 | unsigned long ftrace_location(unsigned long ip); |
Michael Ellerman | 04cf31a | 2016-03-24 22:04:01 +1100 | [diff] [blame] | 458 | unsigned long ftrace_location_range(unsigned long start, unsigned long end); |
Steven Rostedt (Red Hat) | 7413af1 | 2014-05-06 21:34:14 -0400 | [diff] [blame] | 459 | unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec); |
| 460 | unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec); |
Steven Rostedt | c88fd86 | 2011-08-16 09:53:39 -0400 | [diff] [blame] | 461 | |
| 462 | extern ftrace_func_t ftrace_trace_function; |
| 463 | |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 464 | int ftrace_regex_open(struct ftrace_ops *ops, int flag, |
| 465 | struct inode *inode, struct file *file); |
| 466 | ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, |
| 467 | size_t cnt, loff_t *ppos); |
| 468 | ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, |
| 469 | size_t cnt, loff_t *ppos); |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 470 | int ftrace_regex_release(struct inode *inode, struct file *file); |
| 471 | |
Steven Rostedt | 2a85a37 | 2011-12-19 21:57:44 -0500 | [diff] [blame] | 472 | void __init |
| 473 | ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable); |
| 474 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 475 | /* defined in arch */ |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 476 | extern int ftrace_ip_converted(unsigned long ip); |
Jiri Slaby | 3a36cb1 | 2014-02-24 19:59:59 +0100 | [diff] [blame] | 477 | extern int ftrace_dyn_arch_init(void); |
Steven Rostedt | e4f5d54 | 2012-04-27 09:13:18 -0400 | [diff] [blame] | 478 | extern void ftrace_replace_code(int enable); |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 479 | extern int ftrace_update_ftrace_func(ftrace_func_t func); |
| 480 | extern void ftrace_caller(void); |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 481 | extern void ftrace_regs_caller(void); |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 482 | extern void ftrace_call(void); |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 483 | extern void ftrace_regs_call(void); |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 484 | extern void mcount_call(void); |
Shaohua Li | f000120 | 2009-01-09 11:29:42 +0800 | [diff] [blame] | 485 | |
Steven Rostedt | 8ed3e2c | 2012-04-26 14:59:43 -0400 | [diff] [blame] | 486 | void ftrace_modify_all_code(int command); |
| 487 | |
Shaohua Li | f000120 | 2009-01-09 11:29:42 +0800 | [diff] [blame] | 488 | #ifndef FTRACE_ADDR |
| 489 | #define FTRACE_ADDR ((unsigned long)ftrace_caller) |
| 490 | #endif |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 491 | |
Steven Rostedt (Red Hat) | 79922b8 | 2014-05-06 21:56:17 -0400 | [diff] [blame] | 492 | #ifndef FTRACE_GRAPH_ADDR |
| 493 | #define FTRACE_GRAPH_ADDR ((unsigned long)ftrace_graph_caller) |
| 494 | #endif |
| 495 | |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 496 | #ifndef FTRACE_REGS_ADDR |
Masami Hiramatsu | 06aeaae | 2012-09-28 17:15:17 +0900 | [diff] [blame] | 497 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 498 | # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller) |
| 499 | #else |
| 500 | # define FTRACE_REGS_ADDR FTRACE_ADDR |
| 501 | #endif |
| 502 | #endif |
| 503 | |
Steven Rostedt (Red Hat) | 646d704 | 2014-07-11 14:39:10 -0400 | [diff] [blame] | 504 | /* |
| 505 | * If an arch would like functions that are only traced |
| 506 | * by the function graph tracer to jump directly to its own |
| 507 | * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR |
| 508 | * to be that address to jump to. |
| 509 | */ |
| 510 | #ifndef FTRACE_GRAPH_TRAMP_ADDR |
| 511 | #define FTRACE_GRAPH_TRAMP_ADDR ((unsigned long) 0) |
| 512 | #endif |
| 513 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 514 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 515 | extern void ftrace_graph_caller(void); |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 516 | extern int ftrace_enable_ftrace_graph_caller(void); |
| 517 | extern int ftrace_disable_ftrace_graph_caller(void); |
| 518 | #else |
| 519 | static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } |
| 520 | static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 521 | #endif |
Steven Rostedt | ad90c0e | 2008-05-27 20:48:37 -0400 | [diff] [blame] | 522 | |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 523 | /** |
Wenji Huang | 57794a9 | 2009-02-06 17:33:27 +0800 | [diff] [blame] | 524 | * ftrace_make_nop - convert code into nop |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 525 | * @mod: module structure if called by module load initialization |
| 526 | * @rec: the mcount call site record |
| 527 | * @addr: the address that the call site should be calling |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 528 | * |
| 529 | * This is a very sensitive operation and great care needs |
| 530 | * to be taken by the arch. The operation should carefully |
| 531 | * read the location, check to see if what is read is indeed |
| 532 | * what we expect it to be, and then on success of the compare, |
| 533 | * it should write to the location. |
| 534 | * |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 535 | * The code segment at @rec->ip should be a caller to @addr |
| 536 | * |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 537 | * Return must be: |
| 538 | * 0 on success |
| 539 | * -EFAULT on error reading the location |
| 540 | * -EINVAL on a failed compare of the contents |
| 541 | * -EPERM on error writing to the location |
| 542 | * Any other value will be considered a failure. |
| 543 | */ |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 544 | extern int ftrace_make_nop(struct module *mod, |
| 545 | struct dyn_ftrace *rec, unsigned long addr); |
| 546 | |
| 547 | /** |
| 548 | * ftrace_make_call - convert a nop call site into a call to addr |
| 549 | * @rec: the mcount call site record |
| 550 | * @addr: the address that the call site should call |
| 551 | * |
| 552 | * This is a very sensitive operation and great care needs |
| 553 | * to be taken by the arch. The operation should carefully |
| 554 | * read the location, check to see if what is read is indeed |
| 555 | * what we expect it to be, and then on success of the compare, |
| 556 | * it should write to the location. |
| 557 | * |
| 558 | * The code segment at @rec->ip should be a nop |
| 559 | * |
| 560 | * Return must be: |
| 561 | * 0 on success |
| 562 | * -EFAULT on error reading the location |
| 563 | * -EINVAL on a failed compare of the contents |
| 564 | * -EPERM on error writing to the location |
| 565 | * Any other value will be considered a failure. |
| 566 | */ |
| 567 | extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); |
| 568 | |
Masami Hiramatsu | 06aeaae | 2012-09-28 17:15:17 +0900 | [diff] [blame] | 569 | #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS |
Steven Rostedt | 08f6fba | 2012-04-30 16:20:23 -0400 | [diff] [blame] | 570 | /** |
| 571 | * ftrace_modify_call - convert from one addr to another (no nop) |
| 572 | * @rec: the mcount call site record |
| 573 | * @old_addr: the address expected to be currently called to |
| 574 | * @addr: the address to change to |
| 575 | * |
| 576 | * This is a very sensitive operation and great care needs |
| 577 | * to be taken by the arch. The operation should carefully |
| 578 | * read the location, check to see if what is read is indeed |
| 579 | * what we expect it to be, and then on success of the compare, |
| 580 | * it should write to the location. |
| 581 | * |
| 582 | * The code segment at @rec->ip should be a caller to @old_addr |
| 583 | * |
| 584 | * Return must be: |
| 585 | * 0 on success |
| 586 | * -EFAULT on error reading the location |
| 587 | * -EINVAL on a failed compare of the contents |
| 588 | * -EPERM on error writing to the location |
| 589 | * Any other value will be considered a failure. |
| 590 | */ |
| 591 | extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, |
| 592 | unsigned long addr); |
| 593 | #else |
| 594 | /* Should never be called */ |
| 595 | static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, |
| 596 | unsigned long addr) |
| 597 | { |
| 598 | return -EINVAL; |
| 599 | } |
| 600 | #endif |
| 601 | |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 602 | /* May be defined in arch */ |
| 603 | extern int ftrace_arch_read_dyn_info(char *buf, int size); |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 604 | |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 605 | extern int skip_trace(unsigned long ip); |
Steven Rostedt (Red Hat) | a949ae5 | 2014-04-24 10:40:12 -0400 | [diff] [blame] | 606 | extern void ftrace_module_init(struct module *mod); |
Jessica Yu | 7dcd182 | 2016-02-16 17:32:33 -0500 | [diff] [blame] | 607 | extern void ftrace_module_enable(struct module *mod); |
Steven Rostedt (Red Hat) | 049fb9b | 2016-01-05 20:32:47 -0500 | [diff] [blame] | 608 | extern void ftrace_release_mod(struct module *mod); |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 609 | |
Steven Rostedt | c0719e5 | 2008-09-06 01:06:03 -0400 | [diff] [blame] | 610 | extern void ftrace_disable_daemon(void); |
| 611 | extern void ftrace_enable_daemon(void); |
Steven Rostedt | 4dc9367 | 2012-06-06 13:45:31 -0400 | [diff] [blame] | 612 | #else /* CONFIG_DYNAMIC_FTRACE */ |
Steven Rostedt | 4dbf6bc | 2010-05-04 11:24:01 -0400 | [diff] [blame] | 613 | static inline int skip_trace(unsigned long ip) { return 0; } |
| 614 | static inline int ftrace_force_update(void) { return 0; } |
Steven Rostedt | 4dbf6bc | 2010-05-04 11:24:01 -0400 | [diff] [blame] | 615 | static inline void ftrace_disable_daemon(void) { } |
| 616 | static inline void ftrace_enable_daemon(void) { } |
Jessica Yu | 7dcd182 | 2016-02-16 17:32:33 -0500 | [diff] [blame] | 617 | static inline void ftrace_module_init(struct module *mod) { } |
| 618 | static inline void ftrace_module_enable(struct module *mod) { } |
| 619 | static inline void ftrace_release_mod(struct module *mod) { } |
Tom Zanussi | 38de93a | 2013-10-24 08:34:18 -0500 | [diff] [blame] | 620 | static inline __init int register_ftrace_command(struct ftrace_func_command *cmd) |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 621 | { |
Ingo Molnar | 97d0bb8 | 2009-02-17 11:47:39 +0100 | [diff] [blame] | 622 | return -EINVAL; |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 623 | } |
Tom Zanussi | 38de93a | 2013-10-24 08:34:18 -0500 | [diff] [blame] | 624 | static inline __init int unregister_ftrace_command(char *cmd_name) |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 625 | { |
Ingo Molnar | 97d0bb8 | 2009-02-17 11:47:39 +0100 | [diff] [blame] | 626 | return -EINVAL; |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 627 | } |
Sasha Levin | d88471c | 2013-01-09 18:09:20 -0500 | [diff] [blame] | 628 | static inline int ftrace_text_reserved(const void *start, const void *end) |
Masami Hiramatsu | 2cfa197 | 2010-02-02 16:49:11 -0500 | [diff] [blame] | 629 | { |
| 630 | return 0; |
| 631 | } |
Steven Rostedt | 4dc9367 | 2012-06-06 13:45:31 -0400 | [diff] [blame] | 632 | static inline unsigned long ftrace_location(unsigned long ip) |
| 633 | { |
| 634 | return 0; |
| 635 | } |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 636 | |
| 637 | /* |
| 638 | * Again users of functions that have ftrace_ops may not |
| 639 | * have them defined when ftrace is not enabled, but these |
| 640 | * functions may still be called. Use a macro instead of inline. |
| 641 | */ |
| 642 | #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) |
Steven Rostedt | 96de37b | 2012-01-07 17:26:49 -0500 | [diff] [blame] | 643 | #define ftrace_set_early_filter(ops, buf, enable) do { } while (0) |
Masami Hiramatsu | 647664e | 2012-06-05 19:28:08 +0900 | [diff] [blame] | 644 | #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; }) |
Jiri Olsa | 5500fa5 | 2012-02-15 15:51:54 +0100 | [diff] [blame] | 645 | #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; }) |
| 646 | #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; }) |
| 647 | #define ftrace_free_filter(ops) do { } while (0) |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 648 | |
| 649 | static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, |
| 650 | size_t cnt, loff_t *ppos) { return -ENODEV; } |
| 651 | static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, |
| 652 | size_t cnt, loff_t *ppos) { return -ENODEV; } |
Steven Rostedt | fc13cb0 | 2011-12-19 14:41:25 -0500 | [diff] [blame] | 653 | static inline int |
| 654 | ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } |
Steven Rostedt (Red Hat) | aec0be2 | 2014-11-18 21:14:11 -0500 | [diff] [blame] | 655 | |
| 656 | static inline bool is_ftrace_trampoline(unsigned long addr) |
| 657 | { |
| 658 | return false; |
| 659 | } |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 660 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 661 | |
Ingo Molnar | aeaee8a | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 662 | /* totally disable ftrace - can not re-enable after this */ |
| 663 | void ftrace_kill(void); |
| 664 | |
Ingo Molnar | f43fdad | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 665 | static inline void tracer_disable(void) |
| 666 | { |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 667 | #ifdef CONFIG_FUNCTION_TRACER |
Ingo Molnar | f43fdad | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 668 | ftrace_enabled = 0; |
| 669 | #endif |
| 670 | } |
| 671 | |
Huang Ying | 3700273 | 2008-08-18 16:24:56 +0800 | [diff] [blame] | 672 | /* |
| 673 | * Ftrace disable/restore without lock. Some synchronization mechanism |
Huang Ying | 9bdeb7b | 2008-08-15 00:40:25 -0700 | [diff] [blame] | 674 | * must be used to prevent ftrace_enabled to be changed between |
Huang Ying | 3700273 | 2008-08-18 16:24:56 +0800 | [diff] [blame] | 675 | * disable/restore. |
| 676 | */ |
Huang Ying | 9bdeb7b | 2008-08-15 00:40:25 -0700 | [diff] [blame] | 677 | static inline int __ftrace_enabled_save(void) |
| 678 | { |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 679 | #ifdef CONFIG_FUNCTION_TRACER |
Huang Ying | 9bdeb7b | 2008-08-15 00:40:25 -0700 | [diff] [blame] | 680 | int saved_ftrace_enabled = ftrace_enabled; |
| 681 | ftrace_enabled = 0; |
| 682 | return saved_ftrace_enabled; |
| 683 | #else |
| 684 | return 0; |
| 685 | #endif |
| 686 | } |
| 687 | |
| 688 | static inline void __ftrace_enabled_restore(int enabled) |
| 689 | { |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 690 | #ifdef CONFIG_FUNCTION_TRACER |
Huang Ying | 9bdeb7b | 2008-08-15 00:40:25 -0700 | [diff] [blame] | 691 | ftrace_enabled = enabled; |
| 692 | #endif |
| 693 | } |
| 694 | |
AKASHI Takahiro | eed542d | 2014-05-20 20:31:04 +0900 | [diff] [blame] | 695 | /* All archs should have this, but we define it for consistency */ |
| 696 | #ifndef ftrace_return_address0 |
| 697 | # define ftrace_return_address0 __builtin_return_address(0) |
| 698 | #endif |
| 699 | |
| 700 | /* Archs may use other ways for ADDR1 and beyond */ |
| 701 | #ifndef ftrace_return_address |
Uwe Kleine-Koenig | c79a61f | 2009-02-27 21:30:03 +0100 | [diff] [blame] | 702 | # ifdef CONFIG_FRAME_POINTER |
AKASHI Takahiro | eed542d | 2014-05-20 20:31:04 +0900 | [diff] [blame] | 703 | # define ftrace_return_address(n) __builtin_return_address(n) |
Uwe Kleine-Koenig | c79a61f | 2009-02-27 21:30:03 +0100 | [diff] [blame] | 704 | # else |
AKASHI Takahiro | eed542d | 2014-05-20 20:31:04 +0900 | [diff] [blame] | 705 | # define ftrace_return_address(n) 0UL |
Uwe Kleine-Koenig | c79a61f | 2009-02-27 21:30:03 +0100 | [diff] [blame] | 706 | # endif |
AKASHI Takahiro | eed542d | 2014-05-20 20:31:04 +0900 | [diff] [blame] | 707 | #endif |
| 708 | |
| 709 | #define CALLER_ADDR0 ((unsigned long)ftrace_return_address0) |
| 710 | #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1)) |
| 711 | #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2)) |
| 712 | #define CALLER_ADDR3 ((unsigned long)ftrace_return_address(3)) |
| 713 | #define CALLER_ADDR4 ((unsigned long)ftrace_return_address(4)) |
| 714 | #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5)) |
| 715 | #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6)) |
Steven Rostedt | 352ad25 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 716 | |
Sebastian Andrzej Siewior | f904f58 | 2016-02-26 14:54:56 +0100 | [diff] [blame] | 717 | static inline unsigned long get_lock_parent_ip(void) |
| 718 | { |
| 719 | unsigned long addr = CALLER_ADDR0; |
| 720 | |
| 721 | if (!in_lock_functions(addr)) |
| 722 | return addr; |
| 723 | addr = CALLER_ADDR1; |
| 724 | if (!in_lock_functions(addr)) |
| 725 | return addr; |
| 726 | return CALLER_ADDR2; |
| 727 | } |
| 728 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 729 | #ifdef CONFIG_IRQSOFF_TRACER |
Ingo Molnar | 489f139 | 2008-02-25 13:38:05 +0100 | [diff] [blame] | 730 | extern void time_hardirqs_on(unsigned long a0, unsigned long a1); |
| 731 | extern void time_hardirqs_off(unsigned long a0, unsigned long a1); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 732 | #else |
Steven Rostedt | 4dbf6bc | 2010-05-04 11:24:01 -0400 | [diff] [blame] | 733 | static inline void time_hardirqs_on(unsigned long a0, unsigned long a1) { } |
| 734 | static inline void time_hardirqs_off(unsigned long a0, unsigned long a1) { } |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 735 | #endif |
| 736 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 737 | #ifdef CONFIG_PREEMPT_TRACER |
Ingo Molnar | 489f139 | 2008-02-25 13:38:05 +0100 | [diff] [blame] | 738 | extern void trace_preempt_on(unsigned long a0, unsigned long a1); |
| 739 | extern void trace_preempt_off(unsigned long a0, unsigned long a1); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 740 | #else |
Minho Ban | b02ee9a | 2012-05-07 11:36:00 +0900 | [diff] [blame] | 741 | /* |
| 742 | * Use defines instead of static inlines because some arches will make code out |
| 743 | * of the CALLER_ADDR, when we really want these to be a real nop. |
| 744 | */ |
| 745 | # define trace_preempt_on(a0, a1) do { } while (0) |
| 746 | # define trace_preempt_off(a0, a1) do { } while (0) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 747 | #endif |
| 748 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 749 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| 750 | extern void ftrace_init(void); |
| 751 | #else |
| 752 | static inline void ftrace_init(void) { } |
| 753 | #endif |
| 754 | |
Frederic Weisbecker | 71566a0 | 2008-10-31 12:57:20 +0100 | [diff] [blame] | 755 | /* |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 756 | * Structure that defines an entry function trace. |
| 757 | */ |
| 758 | struct ftrace_graph_ent { |
| 759 | unsigned long func; /* Current function */ |
| 760 | int depth; |
| 761 | }; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 762 | |
Frederic Weisbecker | 71566a0 | 2008-10-31 12:57:20 +0100 | [diff] [blame] | 763 | /* |
Frederic Weisbecker | caf4b32 | 2008-11-11 07:03:45 +0100 | [diff] [blame] | 764 | * Structure that defines a return function trace. |
| 765 | */ |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 766 | struct ftrace_graph_ret { |
Frederic Weisbecker | caf4b32 | 2008-11-11 07:03:45 +0100 | [diff] [blame] | 767 | unsigned long func; /* Current function */ |
| 768 | unsigned long long calltime; |
| 769 | unsigned long long rettime; |
Frederic Weisbecker | 0231022 | 2008-11-17 03:22:41 +0100 | [diff] [blame] | 770 | /* Number of functions that overran the depth limit for current task */ |
| 771 | unsigned long overrun; |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 772 | int depth; |
Frederic Weisbecker | caf4b32 | 2008-11-11 07:03:45 +0100 | [diff] [blame] | 773 | }; |
| 774 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 775 | /* Type of the callback handlers for tracing function graph*/ |
| 776 | typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ |
| 777 | typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ |
| 778 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 779 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
Frederic Weisbecker | 8b96f01 | 2008-12-06 03:40:00 +0100 | [diff] [blame] | 780 | |
Steven Rostedt | 5ac9f62 | 2009-03-25 20:55:00 -0400 | [diff] [blame] | 781 | /* for init task */ |
Tetsuo Handa | f876d34 | 2009-04-08 14:05:43 +0900 | [diff] [blame] | 782 | #define INIT_FTRACE_GRAPH .ret_stack = NULL, |
Steven Rostedt | 5ac9f62 | 2009-03-25 20:55:00 -0400 | [diff] [blame] | 783 | |
Frederic Weisbecker | 8b96f01 | 2008-12-06 03:40:00 +0100 | [diff] [blame] | 784 | /* |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 785 | * Stack of return addresses for functions |
| 786 | * of a thread. |
| 787 | * Used in struct thread_info |
| 788 | */ |
| 789 | struct ftrace_ret_stack { |
| 790 | unsigned long ret; |
| 791 | unsigned long func; |
| 792 | unsigned long long calltime; |
Steven Rostedt | a2a16d6 | 2009-03-24 23:17:58 -0400 | [diff] [blame] | 793 | unsigned long long subtime; |
Steven Rostedt | 71e308a | 2009-06-18 12:45:08 -0400 | [diff] [blame] | 794 | unsigned long fp; |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 795 | }; |
| 796 | |
| 797 | /* |
| 798 | * Primary handler of a function return. |
| 799 | * It relays on ftrace_return_to_handler. |
| 800 | * Defined in entry_32/64.S |
| 801 | */ |
| 802 | extern void return_to_handler(void); |
| 803 | |
| 804 | extern int |
Steven Rostedt | 71e308a | 2009-06-18 12:45:08 -0400 | [diff] [blame] | 805 | ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth, |
| 806 | unsigned long frame_pointer); |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 807 | |
| 808 | /* |
Frederic Weisbecker | 8b96f01 | 2008-12-06 03:40:00 +0100 | [diff] [blame] | 809 | * Sometimes we don't want to trace a function with the function |
| 810 | * graph tracer but we want them to keep traced by the usual function |
| 811 | * tracer if the function graph tracer is not configured. |
| 812 | */ |
| 813 | #define __notrace_funcgraph notrace |
| 814 | |
Namhyung Kim | 29ad23b | 2013-10-14 17:24:26 +0900 | [diff] [blame] | 815 | #define FTRACE_NOTRACE_DEPTH 65536 |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 816 | #define FTRACE_RETFUNC_DEPTH 50 |
| 817 | #define FTRACE_RETSTACK_ALLOC_SIZE 32 |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 818 | extern int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
| 819 | trace_func_graph_ent_t entryfunc); |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 820 | |
Steven Rostedt (Red Hat) | 1b2f121 | 2014-06-25 10:39:46 -0400 | [diff] [blame] | 821 | extern bool ftrace_graph_is_dead(void); |
Steven Rostedt | 14a866c | 2008-12-02 23:50:02 -0500 | [diff] [blame] | 822 | extern void ftrace_graph_stop(void); |
| 823 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 824 | /* The current handlers in use */ |
| 825 | extern trace_func_graph_ret_t ftrace_graph_return; |
| 826 | extern trace_func_graph_ent_t ftrace_graph_entry; |
| 827 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 828 | extern void unregister_ftrace_graph(void); |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 829 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 830 | extern void ftrace_graph_init_task(struct task_struct *t); |
| 831 | extern void ftrace_graph_exit_task(struct task_struct *t); |
Steven Rostedt | 868baf0 | 2011-02-10 21:26:13 -0500 | [diff] [blame] | 832 | extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); |
Frederic Weisbecker | 21a8c46 | 2008-12-04 23:51:23 +0100 | [diff] [blame] | 833 | |
| 834 | static inline int task_curr_ret_stack(struct task_struct *t) |
| 835 | { |
| 836 | return t->curr_ret_stack; |
| 837 | } |
Frederic Weisbecker | 380c4b1 | 2008-12-06 03:43:41 +0100 | [diff] [blame] | 838 | |
| 839 | static inline void pause_graph_tracing(void) |
| 840 | { |
| 841 | atomic_inc(¤t->tracing_graph_pause); |
| 842 | } |
| 843 | |
| 844 | static inline void unpause_graph_tracing(void) |
| 845 | { |
| 846 | atomic_dec(¤t->tracing_graph_pause); |
| 847 | } |
Steven Rostedt | 5ac9f62 | 2009-03-25 20:55:00 -0400 | [diff] [blame] | 848 | #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ |
Frederic Weisbecker | 8b96f01 | 2008-12-06 03:40:00 +0100 | [diff] [blame] | 849 | |
| 850 | #define __notrace_funcgraph |
Steven Rostedt | 5ac9f62 | 2009-03-25 20:55:00 -0400 | [diff] [blame] | 851 | #define INIT_FTRACE_GRAPH |
Frederic Weisbecker | 8b96f01 | 2008-12-06 03:40:00 +0100 | [diff] [blame] | 852 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 853 | static inline void ftrace_graph_init_task(struct task_struct *t) { } |
| 854 | static inline void ftrace_graph_exit_task(struct task_struct *t) { } |
Steven Rostedt | 868baf0 | 2011-02-10 21:26:13 -0500 | [diff] [blame] | 855 | static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } |
Frederic Weisbecker | 21a8c46 | 2008-12-04 23:51:23 +0100 | [diff] [blame] | 856 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 857 | static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
| 858 | trace_func_graph_ent_t entryfunc) |
| 859 | { |
| 860 | return -1; |
| 861 | } |
| 862 | static inline void unregister_ftrace_graph(void) { } |
| 863 | |
Frederic Weisbecker | 21a8c46 | 2008-12-04 23:51:23 +0100 | [diff] [blame] | 864 | static inline int task_curr_ret_stack(struct task_struct *tsk) |
| 865 | { |
| 866 | return -1; |
| 867 | } |
Frederic Weisbecker | 380c4b1 | 2008-12-06 03:43:41 +0100 | [diff] [blame] | 868 | |
| 869 | static inline void pause_graph_tracing(void) { } |
| 870 | static inline void unpause_graph_tracing(void) { } |
Steven Rostedt | 5ac9f62 | 2009-03-25 20:55:00 -0400 | [diff] [blame] | 871 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
Frederic Weisbecker | caf4b32 | 2008-11-11 07:03:45 +0100 | [diff] [blame] | 872 | |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 873 | #ifdef CONFIG_TRACING |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 874 | |
| 875 | /* flags for current->trace */ |
| 876 | enum { |
| 877 | TSK_TRACE_FL_TRACE_BIT = 0, |
| 878 | TSK_TRACE_FL_GRAPH_BIT = 1, |
| 879 | }; |
| 880 | enum { |
| 881 | TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT, |
| 882 | TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT, |
| 883 | }; |
| 884 | |
| 885 | static inline void set_tsk_trace_trace(struct task_struct *tsk) |
| 886 | { |
| 887 | set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); |
| 888 | } |
| 889 | |
| 890 | static inline void clear_tsk_trace_trace(struct task_struct *tsk) |
| 891 | { |
| 892 | clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace); |
| 893 | } |
| 894 | |
| 895 | static inline int test_tsk_trace_trace(struct task_struct *tsk) |
| 896 | { |
| 897 | return tsk->trace & TSK_TRACE_FL_TRACE; |
| 898 | } |
| 899 | |
| 900 | static inline void set_tsk_trace_graph(struct task_struct *tsk) |
| 901 | { |
| 902 | set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); |
| 903 | } |
| 904 | |
| 905 | static inline void clear_tsk_trace_graph(struct task_struct *tsk) |
| 906 | { |
| 907 | clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace); |
| 908 | } |
| 909 | |
| 910 | static inline int test_tsk_trace_graph(struct task_struct *tsk) |
| 911 | { |
| 912 | return tsk->trace & TSK_TRACE_FL_GRAPH; |
| 913 | } |
| 914 | |
Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 915 | enum ftrace_dump_mode; |
| 916 | |
| 917 | extern enum ftrace_dump_mode ftrace_dump_on_oops; |
Steven Rostedt (Red Hat) | 0daa2302 | 2014-12-12 22:27:10 -0500 | [diff] [blame] | 918 | extern int tracepoint_printk; |
Ingo Molnar | 526211b | 2009-03-05 10:28:45 +0100 | [diff] [blame] | 919 | |
Steven Rostedt (Red Hat) | de7edd3 | 2013-06-14 16:21:43 -0400 | [diff] [blame] | 920 | extern void disable_trace_on_warning(void); |
| 921 | extern int __disable_trace_on_warning; |
| 922 | |
Steven Rostedt | 261842b | 2009-04-16 21:41:52 -0400 | [diff] [blame] | 923 | #ifdef CONFIG_PREEMPT |
| 924 | #define INIT_TRACE_RECURSION .trace_recursion = 0, |
| 925 | #endif |
| 926 | |
Steven Rostedt (Red Hat) | de7edd3 | 2013-06-14 16:21:43 -0400 | [diff] [blame] | 927 | #else /* CONFIG_TRACING */ |
| 928 | static inline void disable_trace_on_warning(void) { } |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 929 | #endif /* CONFIG_TRACING */ |
| 930 | |
Steven Rostedt | 261842b | 2009-04-16 21:41:52 -0400 | [diff] [blame] | 931 | #ifndef INIT_TRACE_RECURSION |
| 932 | #define INIT_TRACE_RECURSION |
| 933 | #endif |
Markus Metzger | b181874 | 2009-01-19 10:31:01 +0100 | [diff] [blame] | 934 | |
Mike Frysinger | e7b8e67 | 2010-01-26 04:40:03 -0500 | [diff] [blame] | 935 | #ifdef CONFIG_FTRACE_SYSCALLS |
| 936 | |
| 937 | unsigned long arch_syscall_addr(int nr); |
| 938 | |
| 939 | #endif /* CONFIG_FTRACE_SYSCALLS */ |
| 940 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 941 | #endif /* _LINUX_FTRACE_H */ |