Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Infrastructure for profiling code inserted by 'gcc -pg'. |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> |
| 5 | * Copyright (C) 2004-2008 Ingo Molnar <mingo@redhat.com> |
| 6 | * |
| 7 | * Originally ported from the -rt patch by: |
| 8 | * Copyright (C) 2007 Arnaldo Carvalho de Melo <acme@redhat.com> |
| 9 | * |
| 10 | * Based on code in the latency_tracer, that is: |
| 11 | * |
| 12 | * Copyright (C) 2004-2006 Ingo Molnar |
| 13 | * Copyright (C) 2004 William Lee Irwin III |
| 14 | */ |
| 15 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 16 | #include <linux/stop_machine.h> |
| 17 | #include <linux/clocksource.h> |
| 18 | #include <linux/kallsyms.h> |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 19 | #include <linux/seq_file.h> |
Frederic Weisbecker | 4a2b8dd | 2009-01-14 13:33:27 -0800 | [diff] [blame] | 20 | #include <linux/suspend.h> |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 21 | #include <linux/debugfs.h> |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 22 | #include <linux/hardirq.h> |
Ingo Molnar | 2d8b820 | 2008-02-23 16:55:50 +0100 | [diff] [blame] | 23 | #include <linux/kthread.h> |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 24 | #include <linux/uaccess.h> |
Abhishek Sagar | f22f9a8 | 2008-06-21 23:50:29 +0530 | [diff] [blame] | 25 | #include <linux/kprobes.h> |
Ingo Molnar | 2d8b820 | 2008-02-23 16:55:50 +0100 | [diff] [blame] | 26 | #include <linux/ftrace.h> |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 27 | #include <linux/sysctl.h> |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 28 | #include <linux/ctype.h> |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 29 | #include <linux/list.h> |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 30 | #include <linux/hash.h> |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 31 | |
Abhishek Sagar | 395a59d | 2008-06-21 23:47:27 +0530 | [diff] [blame] | 32 | #include <asm/ftrace.h> |
| 33 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 34 | #include "trace.h" |
| 35 | |
Steven Rostedt | 6912896e | 2008-10-23 09:33:03 -0400 | [diff] [blame] | 36 | #define FTRACE_WARN_ON(cond) \ |
| 37 | do { \ |
| 38 | if (WARN_ON(cond)) \ |
| 39 | ftrace_kill(); \ |
| 40 | } while (0) |
| 41 | |
| 42 | #define FTRACE_WARN_ON_ONCE(cond) \ |
| 43 | do { \ |
| 44 | if (WARN_ON_ONCE(cond)) \ |
| 45 | ftrace_kill(); \ |
| 46 | } while (0) |
| 47 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 48 | /* hash bits for specific function selection */ |
| 49 | #define FTRACE_HASH_BITS 7 |
| 50 | #define FTRACE_FUNC_HASHSIZE (1 << FTRACE_HASH_BITS) |
| 51 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 52 | /* ftrace_enabled is a method to turn ftrace on or off */ |
| 53 | int ftrace_enabled __read_mostly; |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 54 | static int last_ftrace_enabled; |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 55 | |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 56 | /* Quick disabling of function tracer. */ |
| 57 | int function_trace_stop; |
| 58 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 59 | /* |
| 60 | * ftrace_disabled is set when an anomaly is discovered. |
| 61 | * ftrace_disabled is much stronger than ftrace_enabled. |
| 62 | */ |
| 63 | static int ftrace_disabled __read_mostly; |
| 64 | |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 65 | static DEFINE_MUTEX(ftrace_lock); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 66 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 67 | static struct ftrace_ops ftrace_list_end __read_mostly = |
| 68 | { |
| 69 | .func = ftrace_stub, |
| 70 | }; |
| 71 | |
| 72 | static struct ftrace_ops *ftrace_list __read_mostly = &ftrace_list_end; |
| 73 | ftrace_func_t ftrace_trace_function __read_mostly = ftrace_stub; |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 74 | ftrace_func_t __ftrace_trace_function __read_mostly = ftrace_stub; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 75 | ftrace_func_t ftrace_pid_function __read_mostly = ftrace_stub; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 76 | |
Ingo Molnar | f225293 | 2008-05-22 10:37:48 +0200 | [diff] [blame] | 77 | static void ftrace_list_func(unsigned long ip, unsigned long parent_ip) |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 78 | { |
| 79 | struct ftrace_ops *op = ftrace_list; |
| 80 | |
| 81 | /* in case someone actually ports this to alpha! */ |
| 82 | read_barrier_depends(); |
| 83 | |
| 84 | while (op != &ftrace_list_end) { |
| 85 | /* silly alpha */ |
| 86 | read_barrier_depends(); |
| 87 | op->func(ip, parent_ip); |
| 88 | op = op->next; |
| 89 | }; |
| 90 | } |
| 91 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 92 | static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip) |
| 93 | { |
Steven Rostedt | 0ef8cde | 2008-12-03 15:36:58 -0500 | [diff] [blame] | 94 | if (!test_tsk_trace_trace(current)) |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 95 | return; |
| 96 | |
| 97 | ftrace_pid_function(ip, parent_ip); |
| 98 | } |
| 99 | |
| 100 | static void set_ftrace_pid_function(ftrace_func_t func) |
| 101 | { |
| 102 | /* do not set ftrace_pid_function to itself! */ |
| 103 | if (func != ftrace_pid_func) |
| 104 | ftrace_pid_function = func; |
| 105 | } |
| 106 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 107 | /** |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 108 | * clear_ftrace_function - reset the ftrace function |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 109 | * |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 110 | * This NULLs the ftrace function and in essence stops |
| 111 | * tracing. There may be lag |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 112 | */ |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 113 | void clear_ftrace_function(void) |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 114 | { |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 115 | ftrace_trace_function = ftrace_stub; |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 116 | __ftrace_trace_function = ftrace_stub; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 117 | ftrace_pid_function = ftrace_stub; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 118 | } |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 119 | |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 120 | #ifndef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST |
| 121 | /* |
| 122 | * For those archs that do not test ftrace_trace_stop in their |
| 123 | * mcount call site, we need to do it from C. |
| 124 | */ |
| 125 | static void ftrace_test_stop_func(unsigned long ip, unsigned long parent_ip) |
| 126 | { |
| 127 | if (function_trace_stop) |
| 128 | return; |
| 129 | |
| 130 | __ftrace_trace_function(ip, parent_ip); |
| 131 | } |
| 132 | #endif |
| 133 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 134 | static int __register_ftrace_function(struct ftrace_ops *ops) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 135 | { |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 136 | ops->next = ftrace_list; |
| 137 | /* |
| 138 | * We are entering ops into the ftrace_list but another |
| 139 | * CPU might be walking that list. We need to make sure |
| 140 | * the ops->next pointer is valid before another CPU sees |
| 141 | * the ops pointer included into the ftrace_list. |
| 142 | */ |
| 143 | smp_wmb(); |
| 144 | ftrace_list = ops; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 145 | |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 146 | if (ftrace_enabled) { |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 147 | ftrace_func_t func; |
| 148 | |
| 149 | if (ops->next == &ftrace_list_end) |
| 150 | func = ops->func; |
| 151 | else |
| 152 | func = ftrace_list_func; |
| 153 | |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 154 | if (ftrace_pid_trace) { |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 155 | set_ftrace_pid_function(func); |
| 156 | func = ftrace_pid_func; |
| 157 | } |
| 158 | |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 159 | /* |
| 160 | * For one func, simply call it directly. |
| 161 | * For more than one func, call the chain. |
| 162 | */ |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 163 | #ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 164 | ftrace_trace_function = func; |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 165 | #else |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 166 | __ftrace_trace_function = func; |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 167 | ftrace_trace_function = ftrace_test_stop_func; |
| 168 | #endif |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 169 | } |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 170 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 171 | return 0; |
| 172 | } |
| 173 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 174 | static int __unregister_ftrace_function(struct ftrace_ops *ops) |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 175 | { |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 176 | struct ftrace_ops **p; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 177 | |
| 178 | /* |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 179 | * If we are removing the last function, then simply point |
| 180 | * to the ftrace_stub. |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 181 | */ |
| 182 | if (ftrace_list == ops && ops->next == &ftrace_list_end) { |
| 183 | ftrace_trace_function = ftrace_stub; |
| 184 | ftrace_list = &ftrace_list_end; |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 185 | return 0; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 186 | } |
| 187 | |
| 188 | for (p = &ftrace_list; *p != &ftrace_list_end; p = &(*p)->next) |
| 189 | if (*p == ops) |
| 190 | break; |
| 191 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 192 | if (*p != ops) |
| 193 | return -1; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 194 | |
| 195 | *p = (*p)->next; |
| 196 | |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 197 | if (ftrace_enabled) { |
| 198 | /* If we only have one func left, then call that directly */ |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 199 | if (ftrace_list->next == &ftrace_list_end) { |
| 200 | ftrace_func_t func = ftrace_list->func; |
| 201 | |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 202 | if (ftrace_pid_trace) { |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 203 | set_ftrace_pid_function(func); |
| 204 | func = ftrace_pid_func; |
| 205 | } |
| 206 | #ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST |
| 207 | ftrace_trace_function = func; |
| 208 | #else |
| 209 | __ftrace_trace_function = func; |
| 210 | #endif |
| 211 | } |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 212 | } |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 213 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 214 | return 0; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 215 | } |
| 216 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 217 | static void ftrace_update_pid_func(void) |
| 218 | { |
| 219 | ftrace_func_t func; |
| 220 | |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 221 | mutex_lock(&ftrace_lock); |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 222 | |
| 223 | if (ftrace_trace_function == ftrace_stub) |
| 224 | goto out; |
| 225 | |
| 226 | func = ftrace_trace_function; |
| 227 | |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 228 | if (ftrace_pid_trace) { |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 229 | set_ftrace_pid_function(func); |
| 230 | func = ftrace_pid_func; |
| 231 | } else { |
Liming Wang | 66eafeb | 2008-12-02 10:33:08 +0800 | [diff] [blame] | 232 | if (func == ftrace_pid_func) |
| 233 | func = ftrace_pid_function; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 234 | } |
| 235 | |
| 236 | #ifdef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST |
| 237 | ftrace_trace_function = func; |
| 238 | #else |
| 239 | __ftrace_trace_function = func; |
| 240 | #endif |
| 241 | |
| 242 | out: |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 243 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 244 | } |
| 245 | |
Ingo Molnar | 73d3fd9 | 2009-02-17 11:48:18 +0100 | [diff] [blame] | 246 | /* set when tracing only a pid */ |
| 247 | struct pid *ftrace_pid_trace; |
| 248 | static struct pid * const ftrace_swapper_pid = &init_struct_pid; |
| 249 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 250 | #ifdef CONFIG_DYNAMIC_FTRACE |
Ingo Molnar | 73d3fd9 | 2009-02-17 11:48:18 +0100 | [diff] [blame] | 251 | |
Steven Rostedt | 99ecdc4 | 2008-08-15 21:40:05 -0400 | [diff] [blame] | 252 | #ifndef CONFIG_FTRACE_MCOUNT_RECORD |
Steven Rostedt | cb7be3b | 2008-10-23 09:33:05 -0400 | [diff] [blame] | 253 | # error Dynamic ftrace depends on MCOUNT_RECORD |
Steven Rostedt | 99ecdc4 | 2008-08-15 21:40:05 -0400 | [diff] [blame] | 254 | #endif |
| 255 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 256 | static struct hlist_head ftrace_func_hash[FTRACE_FUNC_HASHSIZE] __read_mostly; |
| 257 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 258 | struct ftrace_func_probe { |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 259 | struct hlist_node node; |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 260 | struct ftrace_probe_ops *ops; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 261 | unsigned long flags; |
| 262 | unsigned long ip; |
| 263 | void *data; |
| 264 | struct rcu_head rcu; |
| 265 | }; |
| 266 | |
| 267 | |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 268 | enum { |
| 269 | FTRACE_ENABLE_CALLS = (1 << 0), |
| 270 | FTRACE_DISABLE_CALLS = (1 << 1), |
| 271 | FTRACE_UPDATE_TRACE_FUNC = (1 << 2), |
| 272 | FTRACE_ENABLE_MCOUNT = (1 << 3), |
| 273 | FTRACE_DISABLE_MCOUNT = (1 << 4), |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 274 | FTRACE_START_FUNC_RET = (1 << 5), |
| 275 | FTRACE_STOP_FUNC_RET = (1 << 6), |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 276 | }; |
| 277 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 278 | static int ftrace_filtered; |
| 279 | |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 280 | static LIST_HEAD(ftrace_new_addrs); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 281 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 282 | static DEFINE_MUTEX(ftrace_regex_lock); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 283 | |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 284 | struct ftrace_page { |
| 285 | struct ftrace_page *next; |
Steven Rostedt | 431aa3f | 2009-01-06 12:43:01 -0500 | [diff] [blame] | 286 | int index; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 287 | struct dyn_ftrace records[]; |
David Miller | aa5e5ce | 2008-05-13 22:06:56 -0700 | [diff] [blame] | 288 | }; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 289 | |
| 290 | #define ENTRIES_PER_PAGE \ |
| 291 | ((PAGE_SIZE - sizeof(struct ftrace_page)) / sizeof(struct dyn_ftrace)) |
| 292 | |
| 293 | /* estimate from running different kernels */ |
| 294 | #define NR_TO_INIT 10000 |
| 295 | |
| 296 | static struct ftrace_page *ftrace_pages_start; |
| 297 | static struct ftrace_page *ftrace_pages; |
| 298 | |
Steven Rostedt | 37ad508 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 299 | static struct dyn_ftrace *ftrace_free_records; |
| 300 | |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 301 | /* |
| 302 | * This is a double for. Do not use 'break' to break out of the loop, |
| 303 | * you must use a goto. |
| 304 | */ |
| 305 | #define do_for_each_ftrace_rec(pg, rec) \ |
| 306 | for (pg = ftrace_pages_start; pg; pg = pg->next) { \ |
| 307 | int _____i; \ |
| 308 | for (_____i = 0; _____i < pg->index; _____i++) { \ |
| 309 | rec = &pg->records[_____i]; |
| 310 | |
| 311 | #define while_for_each_ftrace_rec() \ |
| 312 | } \ |
| 313 | } |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 314 | |
| 315 | #ifdef CONFIG_KPROBES |
Ingo Molnar | f17845e | 2008-10-24 12:47:10 +0200 | [diff] [blame] | 316 | |
| 317 | static int frozen_record_count; |
| 318 | |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 319 | static inline void freeze_record(struct dyn_ftrace *rec) |
| 320 | { |
| 321 | if (!(rec->flags & FTRACE_FL_FROZEN)) { |
| 322 | rec->flags |= FTRACE_FL_FROZEN; |
| 323 | frozen_record_count++; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | static inline void unfreeze_record(struct dyn_ftrace *rec) |
| 328 | { |
| 329 | if (rec->flags & FTRACE_FL_FROZEN) { |
| 330 | rec->flags &= ~FTRACE_FL_FROZEN; |
| 331 | frozen_record_count--; |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | static inline int record_frozen(struct dyn_ftrace *rec) |
| 336 | { |
| 337 | return rec->flags & FTRACE_FL_FROZEN; |
| 338 | } |
| 339 | #else |
| 340 | # define freeze_record(rec) ({ 0; }) |
| 341 | # define unfreeze_record(rec) ({ 0; }) |
| 342 | # define record_frozen(rec) ({ 0; }) |
| 343 | #endif /* CONFIG_KPROBES */ |
| 344 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 345 | static void ftrace_free_rec(struct dyn_ftrace *rec) |
Steven Rostedt | 37ad508 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 346 | { |
Steven Rostedt | 37ad508 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 347 | rec->ip = (unsigned long)ftrace_free_records; |
| 348 | ftrace_free_records = rec; |
| 349 | rec->flags |= FTRACE_FL_FREE; |
| 350 | } |
| 351 | |
Steven Rostedt | fed1939 | 2008-08-14 22:47:19 -0400 | [diff] [blame] | 352 | void ftrace_release(void *start, unsigned long size) |
| 353 | { |
| 354 | struct dyn_ftrace *rec; |
| 355 | struct ftrace_page *pg; |
| 356 | unsigned long s = (unsigned long)start; |
| 357 | unsigned long e = s + size; |
Steven Rostedt | fed1939 | 2008-08-14 22:47:19 -0400 | [diff] [blame] | 358 | |
Steven Rostedt | 00fd61a | 2008-08-15 21:40:04 -0400 | [diff] [blame] | 359 | if (ftrace_disabled || !start) |
Steven Rostedt | fed1939 | 2008-08-14 22:47:19 -0400 | [diff] [blame] | 360 | return; |
| 361 | |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 362 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 363 | do_for_each_ftrace_rec(pg, rec) { |
| 364 | if ((rec->ip >= s) && (rec->ip < e)) |
| 365 | ftrace_free_rec(rec); |
| 366 | } while_for_each_ftrace_rec(); |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 367 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | fed1939 | 2008-08-14 22:47:19 -0400 | [diff] [blame] | 368 | } |
| 369 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 370 | static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip) |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 371 | { |
Steven Rostedt | 37ad508 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 372 | struct dyn_ftrace *rec; |
| 373 | |
| 374 | /* First check for freed records */ |
| 375 | if (ftrace_free_records) { |
| 376 | rec = ftrace_free_records; |
| 377 | |
Steven Rostedt | 37ad508 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 378 | if (unlikely(!(rec->flags & FTRACE_FL_FREE))) { |
Steven Rostedt | 6912896e | 2008-10-23 09:33:03 -0400 | [diff] [blame] | 379 | FTRACE_WARN_ON_ONCE(1); |
Steven Rostedt | 37ad508 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 380 | ftrace_free_records = NULL; |
| 381 | return NULL; |
| 382 | } |
| 383 | |
| 384 | ftrace_free_records = (void *)rec->ip; |
| 385 | memset(rec, 0, sizeof(*rec)); |
| 386 | return rec; |
| 387 | } |
| 388 | |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 389 | if (ftrace_pages->index == ENTRIES_PER_PAGE) { |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 390 | if (!ftrace_pages->next) { |
| 391 | /* allocate another page */ |
| 392 | ftrace_pages->next = |
| 393 | (void *)get_zeroed_page(GFP_KERNEL); |
| 394 | if (!ftrace_pages->next) |
| 395 | return NULL; |
| 396 | } |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 397 | ftrace_pages = ftrace_pages->next; |
| 398 | } |
| 399 | |
| 400 | return &ftrace_pages->records[ftrace_pages->index++]; |
| 401 | } |
| 402 | |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 403 | static struct dyn_ftrace * |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 404 | ftrace_record_ip(unsigned long ip) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 405 | { |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 406 | struct dyn_ftrace *rec; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 407 | |
Steven Rostedt | f3c7ac4 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 408 | if (ftrace_disabled) |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 409 | return NULL; |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 410 | |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 411 | rec = ftrace_alloc_dyn_node(ip); |
| 412 | if (!rec) |
| 413 | return NULL; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 414 | |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 415 | rec->ip = ip; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 416 | |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 417 | list_add(&rec->list, &ftrace_new_addrs); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 418 | |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 419 | return rec; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 420 | } |
| 421 | |
Steven Rostedt | 05736a4 | 2008-09-22 14:55:47 -0700 | [diff] [blame] | 422 | static void print_ip_ins(const char *fmt, unsigned char *p) |
| 423 | { |
| 424 | int i; |
| 425 | |
| 426 | printk(KERN_CONT "%s", fmt); |
| 427 | |
| 428 | for (i = 0; i < MCOUNT_INSN_SIZE; i++) |
| 429 | printk(KERN_CONT "%s%02x", i ? ":" : "", p[i]); |
| 430 | } |
| 431 | |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 432 | static void ftrace_bug(int failed, unsigned long ip) |
Steven Rostedt | b17e8a3 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 433 | { |
| 434 | switch (failed) { |
| 435 | case -EFAULT: |
| 436 | FTRACE_WARN_ON_ONCE(1); |
| 437 | pr_info("ftrace faulted on modifying "); |
| 438 | print_ip_sym(ip); |
| 439 | break; |
| 440 | case -EINVAL: |
| 441 | FTRACE_WARN_ON_ONCE(1); |
| 442 | pr_info("ftrace failed to modify "); |
| 443 | print_ip_sym(ip); |
Steven Rostedt | b17e8a3 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 444 | print_ip_ins(" actual: ", (unsigned char *)ip); |
Steven Rostedt | b17e8a3 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 445 | printk(KERN_CONT "\n"); |
| 446 | break; |
| 447 | case -EPERM: |
| 448 | FTRACE_WARN_ON_ONCE(1); |
| 449 | pr_info("ftrace faulted on writing "); |
| 450 | print_ip_sym(ip); |
| 451 | break; |
| 452 | default: |
| 453 | FTRACE_WARN_ON_ONCE(1); |
| 454 | pr_info("ftrace faulted on unknown error "); |
| 455 | print_ip_sym(ip); |
| 456 | } |
| 457 | } |
| 458 | |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 459 | |
Abhishek Sagar | 492a7ea5 | 2008-05-25 00:10:04 +0530 | [diff] [blame] | 460 | static int |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 461 | __ftrace_replace_code(struct dyn_ftrace *rec, int enable) |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 462 | { |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 463 | unsigned long ftrace_addr; |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 464 | unsigned long ip, fl; |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 465 | |
Shaohua Li | f000120 | 2009-01-09 11:29:42 +0800 | [diff] [blame] | 466 | ftrace_addr = (unsigned long)FTRACE_ADDR; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 467 | |
| 468 | ip = rec->ip; |
| 469 | |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 470 | /* |
| 471 | * If this record is not to be traced and |
| 472 | * it is not enabled then do nothing. |
| 473 | * |
| 474 | * If this record is not to be traced and |
Wenji Huang | 57794a9 | 2009-02-06 17:33:27 +0800 | [diff] [blame] | 475 | * it is enabled then disable it. |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 476 | * |
| 477 | */ |
| 478 | if (rec->flags & FTRACE_FL_NOTRACE) { |
| 479 | if (rec->flags & FTRACE_FL_ENABLED) |
| 480 | rec->flags &= ~FTRACE_FL_ENABLED; |
| 481 | else |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 482 | return 0; |
| 483 | |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 484 | } else if (ftrace_filtered && enable) { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 485 | /* |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 486 | * Filtering is on: |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 487 | */ |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 488 | |
| 489 | fl = rec->flags & (FTRACE_FL_FILTER | FTRACE_FL_ENABLED); |
| 490 | |
| 491 | /* Record is filtered and enabled, do nothing */ |
| 492 | if (fl == (FTRACE_FL_FILTER | FTRACE_FL_ENABLED)) |
| 493 | return 0; |
| 494 | |
Wenji Huang | 57794a9 | 2009-02-06 17:33:27 +0800 | [diff] [blame] | 495 | /* Record is not filtered or enabled, do nothing */ |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 496 | if (!fl) |
| 497 | return 0; |
| 498 | |
| 499 | /* Record is not filtered but enabled, disable it */ |
| 500 | if (fl == FTRACE_FL_ENABLED) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 501 | rec->flags &= ~FTRACE_FL_ENABLED; |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 502 | else |
| 503 | /* Otherwise record is filtered but not enabled, enable it */ |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 504 | rec->flags |= FTRACE_FL_ENABLED; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 505 | } else { |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 506 | /* Disable or not filtered */ |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 507 | |
| 508 | if (enable) { |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 509 | /* if record is enabled, do nothing */ |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 510 | if (rec->flags & FTRACE_FL_ENABLED) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 511 | return 0; |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 512 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 513 | rec->flags |= FTRACE_FL_ENABLED; |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 514 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 515 | } else { |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 516 | |
Wenji Huang | 57794a9 | 2009-02-06 17:33:27 +0800 | [diff] [blame] | 517 | /* if record is not enabled, do nothing */ |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 518 | if (!(rec->flags & FTRACE_FL_ENABLED)) |
| 519 | return 0; |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 520 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 521 | rec->flags &= ~FTRACE_FL_ENABLED; |
| 522 | } |
| 523 | } |
| 524 | |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 525 | if (rec->flags & FTRACE_FL_ENABLED) |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 526 | return ftrace_make_call(rec, ftrace_addr); |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 527 | else |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 528 | return ftrace_make_nop(NULL, rec, ftrace_addr); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | static void ftrace_replace_code(int enable) |
| 532 | { |
Steven Rostedt | 37ad508 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 533 | struct dyn_ftrace *rec; |
| 534 | struct ftrace_page *pg; |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 535 | int failed; |
Steven Rostedt | 37ad508 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 536 | |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 537 | do_for_each_ftrace_rec(pg, rec) { |
| 538 | /* |
| 539 | * Skip over free records and records that have |
| 540 | * failed. |
| 541 | */ |
| 542 | if (rec->flags & FTRACE_FL_FREE || |
| 543 | rec->flags & FTRACE_FL_FAILED) |
| 544 | continue; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 545 | |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 546 | /* ignore updates to this record's mcount site */ |
| 547 | if (get_kprobe((void *)rec->ip)) { |
| 548 | freeze_record(rec); |
| 549 | continue; |
| 550 | } else { |
| 551 | unfreeze_record(rec); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 552 | } |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 553 | |
| 554 | failed = __ftrace_replace_code(rec, enable); |
| 555 | if (failed && (rec->flags & FTRACE_FL_CONVERTED)) { |
| 556 | rec->flags |= FTRACE_FL_FAILED; |
| 557 | if ((system_state == SYSTEM_BOOTING) || |
| 558 | !core_kernel_text(rec->ip)) { |
| 559 | ftrace_free_rec(rec); |
Steven Rostedt | 4377245 | 2009-02-19 13:41:27 -0500 | [diff] [blame] | 560 | } else { |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 561 | ftrace_bug(failed, rec->ip); |
Steven Rostedt | 4377245 | 2009-02-19 13:41:27 -0500 | [diff] [blame] | 562 | /* Stop processing */ |
| 563 | return; |
| 564 | } |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 565 | } |
| 566 | } while_for_each_ftrace_rec(); |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 567 | } |
| 568 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 569 | static int |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 570 | ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec) |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 571 | { |
| 572 | unsigned long ip; |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 573 | int ret; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 574 | |
| 575 | ip = rec->ip; |
| 576 | |
Shaohua Li | 25aac9d | 2009-01-09 11:29:40 +0800 | [diff] [blame] | 577 | ret = ftrace_make_nop(mod, rec, MCOUNT_ADDR); |
Steven Rostedt | 593eb8a | 2008-10-23 09:32:59 -0400 | [diff] [blame] | 578 | if (ret) { |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 579 | ftrace_bug(ret, ip); |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 580 | rec->flags |= FTRACE_FL_FAILED; |
Abhishek Sagar | 492a7ea5 | 2008-05-25 00:10:04 +0530 | [diff] [blame] | 581 | return 0; |
Steven Rostedt | 37ad508 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 582 | } |
Abhishek Sagar | 492a7ea5 | 2008-05-25 00:10:04 +0530 | [diff] [blame] | 583 | return 1; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 584 | } |
| 585 | |
Steven Rostedt | 000ab69 | 2009-02-17 13:35:06 -0500 | [diff] [blame] | 586 | /* |
| 587 | * archs can override this function if they must do something |
| 588 | * before the modifying code is performed. |
| 589 | */ |
| 590 | int __weak ftrace_arch_code_modify_prepare(void) |
| 591 | { |
| 592 | return 0; |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | * archs can override this function if they must do something |
| 597 | * after the modifying code is performed. |
| 598 | */ |
| 599 | int __weak ftrace_arch_code_modify_post_process(void) |
| 600 | { |
| 601 | return 0; |
| 602 | } |
| 603 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 604 | static int __ftrace_modify_code(void *data) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 605 | { |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 606 | int *command = data; |
| 607 | |
Steven Rostedt | a358324 | 2008-11-11 15:01:42 -0500 | [diff] [blame] | 608 | if (*command & FTRACE_ENABLE_CALLS) |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 609 | ftrace_replace_code(1); |
Steven Rostedt | a358324 | 2008-11-11 15:01:42 -0500 | [diff] [blame] | 610 | else if (*command & FTRACE_DISABLE_CALLS) |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 611 | ftrace_replace_code(0); |
| 612 | |
| 613 | if (*command & FTRACE_UPDATE_TRACE_FUNC) |
| 614 | ftrace_update_ftrace_func(ftrace_trace_function); |
| 615 | |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 616 | if (*command & FTRACE_START_FUNC_RET) |
| 617 | ftrace_enable_ftrace_graph_caller(); |
| 618 | else if (*command & FTRACE_STOP_FUNC_RET) |
| 619 | ftrace_disable_ftrace_graph_caller(); |
| 620 | |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 621 | return 0; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 622 | } |
| 623 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 624 | static void ftrace_run_update_code(int command) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 625 | { |
Steven Rostedt | 000ab69 | 2009-02-17 13:35:06 -0500 | [diff] [blame] | 626 | int ret; |
| 627 | |
| 628 | ret = ftrace_arch_code_modify_prepare(); |
| 629 | FTRACE_WARN_ON(ret); |
| 630 | if (ret) |
| 631 | return; |
| 632 | |
Rusty Russell | 784e2d7 | 2008-07-28 12:16:31 -0500 | [diff] [blame] | 633 | stop_machine(__ftrace_modify_code, &command, NULL); |
Steven Rostedt | 000ab69 | 2009-02-17 13:35:06 -0500 | [diff] [blame] | 634 | |
| 635 | ret = ftrace_arch_code_modify_post_process(); |
| 636 | FTRACE_WARN_ON(ret); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 637 | } |
| 638 | |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 639 | static ftrace_func_t saved_ftrace_func; |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 640 | static int ftrace_start_up; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 641 | |
| 642 | static void ftrace_startup_enable(int command) |
| 643 | { |
| 644 | if (saved_ftrace_func != ftrace_trace_function) { |
| 645 | saved_ftrace_func = ftrace_trace_function; |
| 646 | command |= FTRACE_UPDATE_TRACE_FUNC; |
| 647 | } |
| 648 | |
| 649 | if (!command || !ftrace_enabled) |
| 650 | return; |
| 651 | |
| 652 | ftrace_run_update_code(command); |
| 653 | } |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 654 | |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 655 | static void ftrace_startup(int command) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 656 | { |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 657 | if (unlikely(ftrace_disabled)) |
| 658 | return; |
| 659 | |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 660 | ftrace_start_up++; |
Steven Rostedt | 982c350 | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 661 | command |= FTRACE_ENABLE_CALLS; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 662 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 663 | ftrace_startup_enable(command); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 664 | } |
| 665 | |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 666 | static void ftrace_shutdown(int command) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 667 | { |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 668 | if (unlikely(ftrace_disabled)) |
| 669 | return; |
| 670 | |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 671 | ftrace_start_up--; |
| 672 | if (!ftrace_start_up) |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 673 | command |= FTRACE_DISABLE_CALLS; |
| 674 | |
| 675 | if (saved_ftrace_func != ftrace_trace_function) { |
| 676 | saved_ftrace_func = ftrace_trace_function; |
| 677 | command |= FTRACE_UPDATE_TRACE_FUNC; |
| 678 | } |
| 679 | |
| 680 | if (!command || !ftrace_enabled) |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 681 | return; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 682 | |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 683 | ftrace_run_update_code(command); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 684 | } |
| 685 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 686 | static void ftrace_startup_sysctl(void) |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 687 | { |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 688 | int command = FTRACE_ENABLE_MCOUNT; |
| 689 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 690 | if (unlikely(ftrace_disabled)) |
| 691 | return; |
| 692 | |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 693 | /* Force update next time */ |
| 694 | saved_ftrace_func = NULL; |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 695 | /* ftrace_start_up is true if we want ftrace running */ |
| 696 | if (ftrace_start_up) |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 697 | command |= FTRACE_ENABLE_CALLS; |
| 698 | |
| 699 | ftrace_run_update_code(command); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 700 | } |
| 701 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 702 | static void ftrace_shutdown_sysctl(void) |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 703 | { |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 704 | int command = FTRACE_DISABLE_MCOUNT; |
| 705 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 706 | if (unlikely(ftrace_disabled)) |
| 707 | return; |
| 708 | |
Steven Rostedt | 60a7ecf | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 709 | /* ftrace_start_up is true if ftrace is running */ |
| 710 | if (ftrace_start_up) |
Steven Rostedt | d61f82d | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 711 | command |= FTRACE_DISABLE_CALLS; |
| 712 | |
| 713 | ftrace_run_update_code(command); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 714 | } |
| 715 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 716 | static cycle_t ftrace_update_time; |
| 717 | static unsigned long ftrace_update_cnt; |
| 718 | unsigned long ftrace_update_tot_cnt; |
| 719 | |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 720 | static int ftrace_update_code(struct module *mod) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 721 | { |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 722 | struct dyn_ftrace *p, *t; |
Abhishek Sagar | f22f9a8 | 2008-06-21 23:50:29 +0530 | [diff] [blame] | 723 | cycle_t start, stop; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 724 | |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 725 | start = ftrace_now(raw_smp_processor_id()); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 726 | ftrace_update_cnt = 0; |
| 727 | |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 728 | list_for_each_entry_safe(p, t, &ftrace_new_addrs, list) { |
Abhishek Sagar | f22f9a8 | 2008-06-21 23:50:29 +0530 | [diff] [blame] | 729 | |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 730 | /* If something went wrong, bail without enabling anything */ |
| 731 | if (unlikely(ftrace_disabled)) |
| 732 | return -1; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 733 | |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 734 | list_del_init(&p->list); |
Abhishek Sagar | 0eb9670 | 2008-06-01 21:47:30 +0530 | [diff] [blame] | 735 | |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 736 | /* convert record (i.e, patch mcount-call with NOP) */ |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 737 | if (ftrace_code_disable(mod, p)) { |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 738 | p->flags |= FTRACE_FL_CONVERTED; |
| 739 | ftrace_update_cnt++; |
| 740 | } else |
| 741 | ftrace_free_rec(p); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 742 | } |
| 743 | |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 744 | stop = ftrace_now(raw_smp_processor_id()); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 745 | ftrace_update_time = stop - start; |
| 746 | ftrace_update_tot_cnt += ftrace_update_cnt; |
| 747 | |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 748 | return 0; |
| 749 | } |
| 750 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 751 | static int __init ftrace_dyn_table_alloc(unsigned long num_to_init) |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 752 | { |
| 753 | struct ftrace_page *pg; |
| 754 | int cnt; |
| 755 | int i; |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 756 | |
| 757 | /* allocate a few pages */ |
| 758 | ftrace_pages_start = (void *)get_zeroed_page(GFP_KERNEL); |
| 759 | if (!ftrace_pages_start) |
| 760 | return -1; |
| 761 | |
| 762 | /* |
| 763 | * Allocate a few more pages. |
| 764 | * |
| 765 | * TODO: have some parser search vmlinux before |
| 766 | * final linking to find all calls to ftrace. |
| 767 | * Then we can: |
| 768 | * a) know how many pages to allocate. |
| 769 | * and/or |
| 770 | * b) set up the table then. |
| 771 | * |
| 772 | * The dynamic code is still necessary for |
| 773 | * modules. |
| 774 | */ |
| 775 | |
| 776 | pg = ftrace_pages = ftrace_pages_start; |
| 777 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 778 | cnt = num_to_init / ENTRIES_PER_PAGE; |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 779 | pr_info("ftrace: allocating %ld entries in %d pages\n", |
walimis | 5821e1b | 2008-11-15 15:19:06 +0800 | [diff] [blame] | 780 | num_to_init, cnt + 1); |
Steven Rostedt | 3c1720f | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 781 | |
| 782 | for (i = 0; i < cnt; i++) { |
| 783 | pg->next = (void *)get_zeroed_page(GFP_KERNEL); |
| 784 | |
| 785 | /* If we fail, we'll try later anyway */ |
| 786 | if (!pg->next) |
| 787 | break; |
| 788 | |
| 789 | pg = pg->next; |
| 790 | } |
| 791 | |
| 792 | return 0; |
| 793 | } |
| 794 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 795 | enum { |
| 796 | FTRACE_ITER_FILTER = (1 << 0), |
| 797 | FTRACE_ITER_CONT = (1 << 1), |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 798 | FTRACE_ITER_NOTRACE = (1 << 2), |
Abhishek Sagar | eb9a7bf | 2008-06-01 21:47:54 +0530 | [diff] [blame] | 799 | FTRACE_ITER_FAILURES = (1 << 3), |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 800 | FTRACE_ITER_PRINTALL = (1 << 4), |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 801 | FTRACE_ITER_HASH = (1 << 5), |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 802 | }; |
| 803 | |
| 804 | #define FTRACE_BUFF_MAX (KSYM_SYMBOL_LEN+4) /* room for wildcards */ |
| 805 | |
| 806 | struct ftrace_iterator { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 807 | struct ftrace_page *pg; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 808 | int hidx; |
Steven Rostedt | 431aa3f | 2009-01-06 12:43:01 -0500 | [diff] [blame] | 809 | int idx; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 810 | unsigned flags; |
| 811 | unsigned char buffer[FTRACE_BUFF_MAX+1]; |
| 812 | unsigned buffer_idx; |
| 813 | unsigned filtered; |
| 814 | }; |
| 815 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 816 | static void * |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 817 | t_hash_next(struct seq_file *m, void *v, loff_t *pos) |
| 818 | { |
| 819 | struct ftrace_iterator *iter = m->private; |
| 820 | struct hlist_node *hnd = v; |
| 821 | struct hlist_head *hhd; |
| 822 | |
| 823 | WARN_ON(!(iter->flags & FTRACE_ITER_HASH)); |
| 824 | |
| 825 | (*pos)++; |
| 826 | |
| 827 | retry: |
| 828 | if (iter->hidx >= FTRACE_FUNC_HASHSIZE) |
| 829 | return NULL; |
| 830 | |
| 831 | hhd = &ftrace_func_hash[iter->hidx]; |
| 832 | |
| 833 | if (hlist_empty(hhd)) { |
| 834 | iter->hidx++; |
| 835 | hnd = NULL; |
| 836 | goto retry; |
| 837 | } |
| 838 | |
| 839 | if (!hnd) |
| 840 | hnd = hhd->first; |
| 841 | else { |
| 842 | hnd = hnd->next; |
| 843 | if (!hnd) { |
| 844 | iter->hidx++; |
| 845 | goto retry; |
| 846 | } |
| 847 | } |
| 848 | |
| 849 | return hnd; |
| 850 | } |
| 851 | |
| 852 | static void *t_hash_start(struct seq_file *m, loff_t *pos) |
| 853 | { |
| 854 | struct ftrace_iterator *iter = m->private; |
| 855 | void *p = NULL; |
| 856 | |
| 857 | iter->flags |= FTRACE_ITER_HASH; |
| 858 | |
| 859 | return t_hash_next(m, p, pos); |
| 860 | } |
| 861 | |
| 862 | static int t_hash_show(struct seq_file *m, void *v) |
| 863 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 864 | struct ftrace_func_probe *rec; |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 865 | struct hlist_node *hnd = v; |
| 866 | char str[KSYM_SYMBOL_LEN]; |
| 867 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 868 | rec = hlist_entry(hnd, struct ftrace_func_probe, node); |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 869 | |
Steven Rostedt | 809dcf2 | 2009-02-16 23:06:01 -0500 | [diff] [blame] | 870 | if (rec->ops->print) |
| 871 | return rec->ops->print(m, rec->ip, rec->ops, rec->data); |
| 872 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 873 | kallsyms_lookup(rec->ip, NULL, NULL, NULL, str); |
| 874 | seq_printf(m, "%s:", str); |
| 875 | |
| 876 | kallsyms_lookup((unsigned long)rec->ops->func, NULL, NULL, NULL, str); |
| 877 | seq_printf(m, "%s", str); |
| 878 | |
| 879 | if (rec->data) |
| 880 | seq_printf(m, ":%p", rec->data); |
| 881 | seq_putc(m, '\n'); |
| 882 | |
| 883 | return 0; |
| 884 | } |
| 885 | |
| 886 | static void * |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 887 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 888 | { |
| 889 | struct ftrace_iterator *iter = m->private; |
| 890 | struct dyn_ftrace *rec = NULL; |
| 891 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 892 | if (iter->flags & FTRACE_ITER_HASH) |
| 893 | return t_hash_next(m, v, pos); |
| 894 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 895 | (*pos)++; |
| 896 | |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 897 | if (iter->flags & FTRACE_ITER_PRINTALL) |
| 898 | return NULL; |
| 899 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 900 | retry: |
| 901 | if (iter->idx >= iter->pg->index) { |
| 902 | if (iter->pg->next) { |
| 903 | iter->pg = iter->pg->next; |
| 904 | iter->idx = 0; |
| 905 | goto retry; |
Liming Wang | 50cdaf0 | 2008-11-28 12:13:21 +0800 | [diff] [blame] | 906 | } else { |
| 907 | iter->idx = -1; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 908 | } |
| 909 | } else { |
| 910 | rec = &iter->pg->records[iter->idx++]; |
Steven Rostedt | a9fdda3 | 2008-08-14 22:47:17 -0400 | [diff] [blame] | 911 | if ((rec->flags & FTRACE_FL_FREE) || |
| 912 | |
| 913 | (!(iter->flags & FTRACE_ITER_FAILURES) && |
Abhishek Sagar | eb9a7bf | 2008-06-01 21:47:54 +0530 | [diff] [blame] | 914 | (rec->flags & FTRACE_FL_FAILED)) || |
| 915 | |
| 916 | ((iter->flags & FTRACE_ITER_FAILURES) && |
Steven Rostedt | a9fdda3 | 2008-08-14 22:47:17 -0400 | [diff] [blame] | 917 | !(rec->flags & FTRACE_FL_FAILED)) || |
Abhishek Sagar | eb9a7bf | 2008-06-01 21:47:54 +0530 | [diff] [blame] | 918 | |
Steven Rostedt | 0183fb1 | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 919 | ((iter->flags & FTRACE_ITER_FILTER) && |
| 920 | !(rec->flags & FTRACE_FL_FILTER)) || |
| 921 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 922 | ((iter->flags & FTRACE_ITER_NOTRACE) && |
| 923 | !(rec->flags & FTRACE_FL_NOTRACE))) { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 924 | rec = NULL; |
| 925 | goto retry; |
| 926 | } |
| 927 | } |
| 928 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 929 | return rec; |
| 930 | } |
| 931 | |
| 932 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 933 | { |
| 934 | struct ftrace_iterator *iter = m->private; |
| 935 | void *p = NULL; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 936 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 937 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 938 | /* |
| 939 | * For set_ftrace_filter reading, if we have the filter |
| 940 | * off, we can short cut and just print out that all |
| 941 | * functions are enabled. |
| 942 | */ |
| 943 | if (iter->flags & FTRACE_ITER_FILTER && !ftrace_filtered) { |
| 944 | if (*pos > 0) |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 945 | return t_hash_start(m, pos); |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 946 | iter->flags |= FTRACE_ITER_PRINTALL; |
| 947 | (*pos)++; |
| 948 | return iter; |
| 949 | } |
| 950 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 951 | if (iter->flags & FTRACE_ITER_HASH) |
| 952 | return t_hash_start(m, pos); |
| 953 | |
Liming Wang | 50cdaf0 | 2008-11-28 12:13:21 +0800 | [diff] [blame] | 954 | if (*pos > 0) { |
| 955 | if (iter->idx < 0) |
| 956 | return p; |
| 957 | (*pos)--; |
| 958 | iter->idx--; |
| 959 | } |
walimis | 5821e1b | 2008-11-15 15:19:06 +0800 | [diff] [blame] | 960 | |
Liming Wang | 50cdaf0 | 2008-11-28 12:13:21 +0800 | [diff] [blame] | 961 | p = t_next(m, p, pos); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 962 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 963 | if (!p) |
| 964 | return t_hash_start(m, pos); |
| 965 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 966 | return p; |
| 967 | } |
| 968 | |
| 969 | static void t_stop(struct seq_file *m, void *p) |
| 970 | { |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 971 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | static int t_show(struct seq_file *m, void *v) |
| 975 | { |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 976 | struct ftrace_iterator *iter = m->private; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 977 | struct dyn_ftrace *rec = v; |
| 978 | char str[KSYM_SYMBOL_LEN]; |
| 979 | |
Steven Rostedt | 8fc0c70 | 2009-02-16 15:28:00 -0500 | [diff] [blame] | 980 | if (iter->flags & FTRACE_ITER_HASH) |
| 981 | return t_hash_show(m, v); |
| 982 | |
Steven Rostedt | 0c75a3e | 2009-02-16 11:21:52 -0500 | [diff] [blame] | 983 | if (iter->flags & FTRACE_ITER_PRINTALL) { |
| 984 | seq_printf(m, "#### all functions enabled ####\n"); |
| 985 | return 0; |
| 986 | } |
| 987 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 988 | if (!rec) |
| 989 | return 0; |
| 990 | |
| 991 | kallsyms_lookup(rec->ip, NULL, NULL, NULL, str); |
| 992 | |
Liming Wang | 50cdaf0 | 2008-11-28 12:13:21 +0800 | [diff] [blame] | 993 | seq_printf(m, "%s\n", str); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 994 | |
| 995 | return 0; |
| 996 | } |
| 997 | |
| 998 | static struct seq_operations show_ftrace_seq_ops = { |
| 999 | .start = t_start, |
| 1000 | .next = t_next, |
| 1001 | .stop = t_stop, |
| 1002 | .show = t_show, |
| 1003 | }; |
| 1004 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1005 | static int |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1006 | ftrace_avail_open(struct inode *inode, struct file *file) |
| 1007 | { |
| 1008 | struct ftrace_iterator *iter; |
| 1009 | int ret; |
| 1010 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 1011 | if (unlikely(ftrace_disabled)) |
| 1012 | return -ENODEV; |
| 1013 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1014 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1015 | if (!iter) |
| 1016 | return -ENOMEM; |
| 1017 | |
| 1018 | iter->pg = ftrace_pages_start; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1019 | |
| 1020 | ret = seq_open(file, &show_ftrace_seq_ops); |
| 1021 | if (!ret) { |
| 1022 | struct seq_file *m = file->private_data; |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1023 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1024 | m->private = iter; |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1025 | } else { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1026 | kfree(iter); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1027 | } |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1028 | |
| 1029 | return ret; |
| 1030 | } |
| 1031 | |
| 1032 | int ftrace_avail_release(struct inode *inode, struct file *file) |
| 1033 | { |
| 1034 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 1035 | struct ftrace_iterator *iter = m->private; |
| 1036 | |
| 1037 | seq_release(inode, file); |
| 1038 | kfree(iter); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1039 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1040 | return 0; |
| 1041 | } |
| 1042 | |
Abhishek Sagar | eb9a7bf | 2008-06-01 21:47:54 +0530 | [diff] [blame] | 1043 | static int |
| 1044 | ftrace_failures_open(struct inode *inode, struct file *file) |
| 1045 | { |
| 1046 | int ret; |
| 1047 | struct seq_file *m; |
| 1048 | struct ftrace_iterator *iter; |
| 1049 | |
| 1050 | ret = ftrace_avail_open(inode, file); |
| 1051 | if (!ret) { |
| 1052 | m = (struct seq_file *)file->private_data; |
| 1053 | iter = (struct ftrace_iterator *)m->private; |
| 1054 | iter->flags = FTRACE_ITER_FAILURES; |
| 1055 | } |
| 1056 | |
| 1057 | return ret; |
| 1058 | } |
| 1059 | |
| 1060 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1061 | static void ftrace_filter_reset(int enable) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1062 | { |
| 1063 | struct ftrace_page *pg; |
| 1064 | struct dyn_ftrace *rec; |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1065 | unsigned long type = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1066 | |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 1067 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1068 | if (enable) |
| 1069 | ftrace_filtered = 0; |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 1070 | do_for_each_ftrace_rec(pg, rec) { |
| 1071 | if (rec->flags & FTRACE_FL_FAILED) |
| 1072 | continue; |
| 1073 | rec->flags &= ~type; |
| 1074 | } while_for_each_ftrace_rec(); |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 1075 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1076 | } |
| 1077 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1078 | static int |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1079 | ftrace_regex_open(struct inode *inode, struct file *file, int enable) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1080 | { |
| 1081 | struct ftrace_iterator *iter; |
| 1082 | int ret = 0; |
| 1083 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 1084 | if (unlikely(ftrace_disabled)) |
| 1085 | return -ENODEV; |
| 1086 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1087 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1088 | if (!iter) |
| 1089 | return -ENOMEM; |
| 1090 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1091 | mutex_lock(&ftrace_regex_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1092 | if ((file->f_mode & FMODE_WRITE) && |
| 1093 | !(file->f_flags & O_APPEND)) |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1094 | ftrace_filter_reset(enable); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1095 | |
| 1096 | if (file->f_mode & FMODE_READ) { |
| 1097 | iter->pg = ftrace_pages_start; |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1098 | iter->flags = enable ? FTRACE_ITER_FILTER : |
| 1099 | FTRACE_ITER_NOTRACE; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1100 | |
| 1101 | ret = seq_open(file, &show_ftrace_seq_ops); |
| 1102 | if (!ret) { |
| 1103 | struct seq_file *m = file->private_data; |
| 1104 | m->private = iter; |
| 1105 | } else |
| 1106 | kfree(iter); |
| 1107 | } else |
| 1108 | file->private_data = iter; |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1109 | mutex_unlock(&ftrace_regex_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1110 | |
| 1111 | return ret; |
| 1112 | } |
| 1113 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1114 | static int |
| 1115 | ftrace_filter_open(struct inode *inode, struct file *file) |
| 1116 | { |
| 1117 | return ftrace_regex_open(inode, file, 1); |
| 1118 | } |
| 1119 | |
| 1120 | static int |
| 1121 | ftrace_notrace_open(struct inode *inode, struct file *file) |
| 1122 | { |
| 1123 | return ftrace_regex_open(inode, file, 0); |
| 1124 | } |
| 1125 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1126 | static ssize_t |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1127 | ftrace_regex_read(struct file *file, char __user *ubuf, |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1128 | size_t cnt, loff_t *ppos) |
| 1129 | { |
| 1130 | if (file->f_mode & FMODE_READ) |
| 1131 | return seq_read(file, ubuf, cnt, ppos); |
| 1132 | else |
| 1133 | return -EPERM; |
| 1134 | } |
| 1135 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1136 | static loff_t |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1137 | ftrace_regex_lseek(struct file *file, loff_t offset, int origin) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1138 | { |
| 1139 | loff_t ret; |
| 1140 | |
| 1141 | if (file->f_mode & FMODE_READ) |
| 1142 | ret = seq_lseek(file, offset, origin); |
| 1143 | else |
| 1144 | file->f_pos = ret = 1; |
| 1145 | |
| 1146 | return ret; |
| 1147 | } |
| 1148 | |
| 1149 | enum { |
| 1150 | MATCH_FULL, |
| 1151 | MATCH_FRONT_ONLY, |
| 1152 | MATCH_MIDDLE_ONLY, |
| 1153 | MATCH_END_ONLY, |
| 1154 | }; |
| 1155 | |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1156 | /* |
| 1157 | * (static function - no need for kernel doc) |
| 1158 | * |
| 1159 | * Pass in a buffer containing a glob and this function will |
| 1160 | * set search to point to the search part of the buffer and |
| 1161 | * return the type of search it is (see enum above). |
| 1162 | * This does modify buff. |
| 1163 | * |
| 1164 | * Returns enum type. |
| 1165 | * search returns the pointer to use for comparison. |
| 1166 | * not returns 1 if buff started with a '!' |
| 1167 | * 0 otherwise. |
| 1168 | */ |
| 1169 | static int |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1170 | ftrace_setup_glob(char *buff, int len, char **search, int *not) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1171 | { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1172 | int type = MATCH_FULL; |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1173 | int i; |
Steven Rostedt | ea3a6d6 | 2008-12-17 15:05:36 -0500 | [diff] [blame] | 1174 | |
| 1175 | if (buff[0] == '!') { |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1176 | *not = 1; |
Steven Rostedt | ea3a6d6 | 2008-12-17 15:05:36 -0500 | [diff] [blame] | 1177 | buff++; |
| 1178 | len--; |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1179 | } else |
| 1180 | *not = 0; |
| 1181 | |
| 1182 | *search = buff; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1183 | |
| 1184 | for (i = 0; i < len; i++) { |
| 1185 | if (buff[i] == '*') { |
| 1186 | if (!i) { |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1187 | *search = buff + 1; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1188 | type = MATCH_END_ONLY; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1189 | } else { |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1190 | if (type == MATCH_END_ONLY) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1191 | type = MATCH_MIDDLE_ONLY; |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1192 | else |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1193 | type = MATCH_FRONT_ONLY; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1194 | buff[i] = 0; |
| 1195 | break; |
| 1196 | } |
| 1197 | } |
| 1198 | } |
| 1199 | |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1200 | return type; |
| 1201 | } |
| 1202 | |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1203 | static int ftrace_match(char *str, char *regex, int len, int type) |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1204 | { |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1205 | int matched = 0; |
| 1206 | char *ptr; |
| 1207 | |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1208 | switch (type) { |
| 1209 | case MATCH_FULL: |
| 1210 | if (strcmp(str, regex) == 0) |
| 1211 | matched = 1; |
| 1212 | break; |
| 1213 | case MATCH_FRONT_ONLY: |
| 1214 | if (strncmp(str, regex, len) == 0) |
| 1215 | matched = 1; |
| 1216 | break; |
| 1217 | case MATCH_MIDDLE_ONLY: |
| 1218 | if (strstr(str, regex)) |
| 1219 | matched = 1; |
| 1220 | break; |
| 1221 | case MATCH_END_ONLY: |
| 1222 | ptr = strstr(str, regex); |
| 1223 | if (ptr && (ptr[len] == 0)) |
| 1224 | matched = 1; |
| 1225 | break; |
| 1226 | } |
| 1227 | |
| 1228 | return matched; |
| 1229 | } |
| 1230 | |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1231 | static int |
| 1232 | ftrace_match_record(struct dyn_ftrace *rec, char *regex, int len, int type) |
| 1233 | { |
| 1234 | char str[KSYM_SYMBOL_LEN]; |
| 1235 | |
| 1236 | kallsyms_lookup(rec->ip, NULL, NULL, NULL, str); |
| 1237 | return ftrace_match(str, regex, len, type); |
| 1238 | } |
| 1239 | |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1240 | static void ftrace_match_records(char *buff, int len, int enable) |
| 1241 | { |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 1242 | unsigned int search_len; |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1243 | struct ftrace_page *pg; |
| 1244 | struct dyn_ftrace *rec; |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 1245 | unsigned long flag; |
| 1246 | char *search; |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1247 | int type; |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1248 | int not; |
| 1249 | |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 1250 | flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1251 | type = ftrace_setup_glob(buff, len, &search, ¬); |
| 1252 | |
| 1253 | search_len = strlen(search); |
| 1254 | |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 1255 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 1256 | do_for_each_ftrace_rec(pg, rec) { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1257 | |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 1258 | if (rec->flags & FTRACE_FL_FAILED) |
| 1259 | continue; |
Steven Rostedt | 9f4801e | 2009-02-13 15:56:43 -0500 | [diff] [blame] | 1260 | |
| 1261 | if (ftrace_match_record(rec, search, search_len, type)) { |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 1262 | if (not) |
| 1263 | rec->flags &= ~flag; |
| 1264 | else |
| 1265 | rec->flags |= flag; |
| 1266 | } |
Steven Rostedt | e68746a | 2009-02-13 20:53:42 -0500 | [diff] [blame] | 1267 | /* |
| 1268 | * Only enable filtering if we have a function that |
| 1269 | * is filtered on. |
| 1270 | */ |
| 1271 | if (enable && (rec->flags & FTRACE_FL_FILTER)) |
| 1272 | ftrace_filtered = 1; |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 1273 | } while_for_each_ftrace_rec(); |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 1274 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1275 | } |
| 1276 | |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1277 | static int |
| 1278 | ftrace_match_module_record(struct dyn_ftrace *rec, char *mod, |
| 1279 | char *regex, int len, int type) |
| 1280 | { |
| 1281 | char str[KSYM_SYMBOL_LEN]; |
| 1282 | char *modname; |
| 1283 | |
| 1284 | kallsyms_lookup(rec->ip, NULL, NULL, &modname, str); |
| 1285 | |
| 1286 | if (!modname || strcmp(modname, mod)) |
| 1287 | return 0; |
| 1288 | |
| 1289 | /* blank search means to match all funcs in the mod */ |
| 1290 | if (len) |
| 1291 | return ftrace_match(str, regex, len, type); |
| 1292 | else |
| 1293 | return 1; |
| 1294 | } |
| 1295 | |
| 1296 | static void ftrace_match_module_records(char *buff, char *mod, int enable) |
| 1297 | { |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 1298 | unsigned search_len = 0; |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1299 | struct ftrace_page *pg; |
| 1300 | struct dyn_ftrace *rec; |
| 1301 | int type = MATCH_FULL; |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 1302 | char *search = buff; |
| 1303 | unsigned long flag; |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1304 | int not = 0; |
| 1305 | |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 1306 | flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; |
| 1307 | |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1308 | /* blank or '*' mean the same */ |
| 1309 | if (strcmp(buff, "*") == 0) |
| 1310 | buff[0] = 0; |
| 1311 | |
| 1312 | /* handle the case of 'dont filter this module' */ |
| 1313 | if (strcmp(buff, "!") == 0 || strcmp(buff, "!*") == 0) { |
| 1314 | buff[0] = 0; |
| 1315 | not = 1; |
| 1316 | } |
| 1317 | |
| 1318 | if (strlen(buff)) { |
| 1319 | type = ftrace_setup_glob(buff, strlen(buff), &search, ¬); |
| 1320 | search_len = strlen(search); |
| 1321 | } |
| 1322 | |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 1323 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1324 | do_for_each_ftrace_rec(pg, rec) { |
| 1325 | |
| 1326 | if (rec->flags & FTRACE_FL_FAILED) |
| 1327 | continue; |
| 1328 | |
| 1329 | if (ftrace_match_module_record(rec, mod, |
| 1330 | search, search_len, type)) { |
| 1331 | if (not) |
| 1332 | rec->flags &= ~flag; |
| 1333 | else |
| 1334 | rec->flags |= flag; |
| 1335 | } |
Steven Rostedt | e68746a | 2009-02-13 20:53:42 -0500 | [diff] [blame] | 1336 | if (enable && (rec->flags & FTRACE_FL_FILTER)) |
| 1337 | ftrace_filtered = 1; |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1338 | |
| 1339 | } while_for_each_ftrace_rec(); |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 1340 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1341 | } |
| 1342 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 1343 | /* |
| 1344 | * We register the module command as a template to show others how |
| 1345 | * to register the a command as well. |
| 1346 | */ |
| 1347 | |
| 1348 | static int |
| 1349 | ftrace_mod_callback(char *func, char *cmd, char *param, int enable) |
| 1350 | { |
| 1351 | char *mod; |
| 1352 | |
| 1353 | /* |
| 1354 | * cmd == 'mod' because we only registered this func |
| 1355 | * for the 'mod' ftrace_func_command. |
| 1356 | * But if you register one func with multiple commands, |
| 1357 | * you can tell which command was used by the cmd |
| 1358 | * parameter. |
| 1359 | */ |
| 1360 | |
| 1361 | /* we must have a module name */ |
| 1362 | if (!param) |
| 1363 | return -EINVAL; |
| 1364 | |
| 1365 | mod = strsep(¶m, ":"); |
| 1366 | if (!strlen(mod)) |
| 1367 | return -EINVAL; |
| 1368 | |
| 1369 | ftrace_match_module_records(func, mod, enable); |
| 1370 | return 0; |
| 1371 | } |
| 1372 | |
| 1373 | static struct ftrace_func_command ftrace_mod_cmd = { |
| 1374 | .name = "mod", |
| 1375 | .func = ftrace_mod_callback, |
| 1376 | }; |
| 1377 | |
| 1378 | static int __init ftrace_mod_cmd_init(void) |
| 1379 | { |
| 1380 | return register_ftrace_command(&ftrace_mod_cmd); |
| 1381 | } |
| 1382 | device_initcall(ftrace_mod_cmd_init); |
| 1383 | |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1384 | static void |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1385 | function_trace_probe_call(unsigned long ip, unsigned long parent_ip) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1386 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1387 | struct ftrace_func_probe *entry; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1388 | struct hlist_head *hhd; |
| 1389 | struct hlist_node *n; |
| 1390 | unsigned long key; |
| 1391 | int resched; |
| 1392 | |
| 1393 | key = hash_long(ip, FTRACE_HASH_BITS); |
| 1394 | |
| 1395 | hhd = &ftrace_func_hash[key]; |
| 1396 | |
| 1397 | if (hlist_empty(hhd)) |
| 1398 | return; |
| 1399 | |
| 1400 | /* |
| 1401 | * Disable preemption for these calls to prevent a RCU grace |
| 1402 | * period. This syncs the hash iteration and freeing of items |
| 1403 | * on the hash. rcu_read_lock is too dangerous here. |
| 1404 | */ |
| 1405 | resched = ftrace_preempt_disable(); |
| 1406 | hlist_for_each_entry_rcu(entry, n, hhd, node) { |
| 1407 | if (entry->ip == ip) |
| 1408 | entry->ops->func(ip, parent_ip, &entry->data); |
| 1409 | } |
| 1410 | ftrace_preempt_enable(resched); |
| 1411 | } |
| 1412 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1413 | static struct ftrace_ops trace_probe_ops __read_mostly = |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1414 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1415 | .func = function_trace_probe_call, |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1416 | }; |
| 1417 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1418 | static int ftrace_probe_registered; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1419 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1420 | static void __enable_ftrace_function_probe(void) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1421 | { |
| 1422 | int i; |
| 1423 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1424 | if (ftrace_probe_registered) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1425 | return; |
| 1426 | |
| 1427 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { |
| 1428 | struct hlist_head *hhd = &ftrace_func_hash[i]; |
| 1429 | if (hhd->first) |
| 1430 | break; |
| 1431 | } |
| 1432 | /* Nothing registered? */ |
| 1433 | if (i == FTRACE_FUNC_HASHSIZE) |
| 1434 | return; |
| 1435 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1436 | __register_ftrace_function(&trace_probe_ops); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1437 | ftrace_startup(0); |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1438 | ftrace_probe_registered = 1; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1439 | } |
| 1440 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1441 | static void __disable_ftrace_function_probe(void) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1442 | { |
| 1443 | int i; |
| 1444 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1445 | if (!ftrace_probe_registered) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1446 | return; |
| 1447 | |
| 1448 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { |
| 1449 | struct hlist_head *hhd = &ftrace_func_hash[i]; |
| 1450 | if (hhd->first) |
| 1451 | return; |
| 1452 | } |
| 1453 | |
| 1454 | /* no more funcs left */ |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1455 | __unregister_ftrace_function(&trace_probe_ops); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1456 | ftrace_shutdown(0); |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1457 | ftrace_probe_registered = 0; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1458 | } |
| 1459 | |
| 1460 | |
| 1461 | static void ftrace_free_entry_rcu(struct rcu_head *rhp) |
| 1462 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1463 | struct ftrace_func_probe *entry = |
| 1464 | container_of(rhp, struct ftrace_func_probe, rcu); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1465 | |
| 1466 | if (entry->ops->free) |
| 1467 | entry->ops->free(&entry->data); |
| 1468 | kfree(entry); |
| 1469 | } |
| 1470 | |
| 1471 | |
| 1472 | int |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1473 | register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1474 | void *data) |
| 1475 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1476 | struct ftrace_func_probe *entry; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1477 | struct ftrace_page *pg; |
| 1478 | struct dyn_ftrace *rec; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1479 | int type, len, not; |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 1480 | unsigned long key; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1481 | int count = 0; |
| 1482 | char *search; |
| 1483 | |
| 1484 | type = ftrace_setup_glob(glob, strlen(glob), &search, ¬); |
| 1485 | len = strlen(search); |
| 1486 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1487 | /* we do not support '!' for function probes */ |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1488 | if (WARN_ON(not)) |
| 1489 | return -EINVAL; |
| 1490 | |
| 1491 | mutex_lock(&ftrace_lock); |
| 1492 | do_for_each_ftrace_rec(pg, rec) { |
| 1493 | |
| 1494 | if (rec->flags & FTRACE_FL_FAILED) |
| 1495 | continue; |
| 1496 | |
| 1497 | if (!ftrace_match_record(rec, search, len, type)) |
| 1498 | continue; |
| 1499 | |
| 1500 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); |
| 1501 | if (!entry) { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1502 | /* If we did not process any, then return error */ |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1503 | if (!count) |
| 1504 | count = -ENOMEM; |
| 1505 | goto out_unlock; |
| 1506 | } |
| 1507 | |
| 1508 | count++; |
| 1509 | |
| 1510 | entry->data = data; |
| 1511 | |
| 1512 | /* |
| 1513 | * The caller might want to do something special |
| 1514 | * for each function we find. We call the callback |
| 1515 | * to give the caller an opportunity to do so. |
| 1516 | */ |
| 1517 | if (ops->callback) { |
| 1518 | if (ops->callback(rec->ip, &entry->data) < 0) { |
| 1519 | /* caller does not like this func */ |
| 1520 | kfree(entry); |
| 1521 | continue; |
| 1522 | } |
| 1523 | } |
| 1524 | |
| 1525 | entry->ops = ops; |
| 1526 | entry->ip = rec->ip; |
| 1527 | |
| 1528 | key = hash_long(entry->ip, FTRACE_HASH_BITS); |
| 1529 | hlist_add_head_rcu(&entry->node, &ftrace_func_hash[key]); |
| 1530 | |
| 1531 | } while_for_each_ftrace_rec(); |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1532 | __enable_ftrace_function_probe(); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1533 | |
| 1534 | out_unlock: |
| 1535 | mutex_unlock(&ftrace_lock); |
| 1536 | |
| 1537 | return count; |
| 1538 | } |
| 1539 | |
| 1540 | enum { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1541 | PROBE_TEST_FUNC = 1, |
| 1542 | PROBE_TEST_DATA = 2 |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1543 | }; |
| 1544 | |
| 1545 | static void |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1546 | __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1547 | void *data, int flags) |
| 1548 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1549 | struct ftrace_func_probe *entry; |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1550 | struct hlist_node *n, *tmp; |
| 1551 | char str[KSYM_SYMBOL_LEN]; |
| 1552 | int type = MATCH_FULL; |
| 1553 | int i, len = 0; |
| 1554 | char *search; |
| 1555 | |
| 1556 | if (glob && (strcmp(glob, "*") || !strlen(glob))) |
| 1557 | glob = NULL; |
| 1558 | else { |
| 1559 | int not; |
| 1560 | |
| 1561 | type = ftrace_setup_glob(glob, strlen(glob), &search, ¬); |
| 1562 | len = strlen(search); |
| 1563 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1564 | /* we do not support '!' for function probes */ |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1565 | if (WARN_ON(not)) |
| 1566 | return; |
| 1567 | } |
| 1568 | |
| 1569 | mutex_lock(&ftrace_lock); |
| 1570 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { |
| 1571 | struct hlist_head *hhd = &ftrace_func_hash[i]; |
| 1572 | |
| 1573 | hlist_for_each_entry_safe(entry, n, tmp, hhd, node) { |
| 1574 | |
| 1575 | /* break up if statements for readability */ |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1576 | if ((flags & PROBE_TEST_FUNC) && entry->ops != ops) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1577 | continue; |
| 1578 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1579 | if ((flags & PROBE_TEST_DATA) && entry->data != data) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1580 | continue; |
| 1581 | |
| 1582 | /* do this last, since it is the most expensive */ |
| 1583 | if (glob) { |
| 1584 | kallsyms_lookup(entry->ip, NULL, NULL, |
| 1585 | NULL, str); |
| 1586 | if (!ftrace_match(str, glob, len, type)) |
| 1587 | continue; |
| 1588 | } |
| 1589 | |
| 1590 | hlist_del(&entry->node); |
| 1591 | call_rcu(&entry->rcu, ftrace_free_entry_rcu); |
| 1592 | } |
| 1593 | } |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1594 | __disable_ftrace_function_probe(); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1595 | mutex_unlock(&ftrace_lock); |
| 1596 | } |
| 1597 | |
| 1598 | void |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1599 | unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1600 | void *data) |
| 1601 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1602 | __unregister_ftrace_function_probe(glob, ops, data, |
| 1603 | PROBE_TEST_FUNC | PROBE_TEST_DATA); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1604 | } |
| 1605 | |
| 1606 | void |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1607 | unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1608 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1609 | __unregister_ftrace_function_probe(glob, ops, NULL, PROBE_TEST_FUNC); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1610 | } |
| 1611 | |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1612 | void unregister_ftrace_function_probe_all(char *glob) |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1613 | { |
Steven Rostedt | b6887d7 | 2009-02-17 12:32:04 -0500 | [diff] [blame] | 1614 | __unregister_ftrace_function_probe(glob, NULL, NULL, 0); |
Steven Rostedt | 59df055f | 2009-02-14 15:29:06 -0500 | [diff] [blame] | 1615 | } |
| 1616 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 1617 | static LIST_HEAD(ftrace_commands); |
| 1618 | static DEFINE_MUTEX(ftrace_cmd_mutex); |
| 1619 | |
| 1620 | int register_ftrace_command(struct ftrace_func_command *cmd) |
| 1621 | { |
| 1622 | struct ftrace_func_command *p; |
| 1623 | int ret = 0; |
| 1624 | |
| 1625 | mutex_lock(&ftrace_cmd_mutex); |
| 1626 | list_for_each_entry(p, &ftrace_commands, list) { |
| 1627 | if (strcmp(cmd->name, p->name) == 0) { |
| 1628 | ret = -EBUSY; |
| 1629 | goto out_unlock; |
| 1630 | } |
| 1631 | } |
| 1632 | list_add(&cmd->list, &ftrace_commands); |
| 1633 | out_unlock: |
| 1634 | mutex_unlock(&ftrace_cmd_mutex); |
| 1635 | |
| 1636 | return ret; |
| 1637 | } |
| 1638 | |
| 1639 | int unregister_ftrace_command(struct ftrace_func_command *cmd) |
| 1640 | { |
| 1641 | struct ftrace_func_command *p, *n; |
| 1642 | int ret = -ENODEV; |
| 1643 | |
| 1644 | mutex_lock(&ftrace_cmd_mutex); |
| 1645 | list_for_each_entry_safe(p, n, &ftrace_commands, list) { |
| 1646 | if (strcmp(cmd->name, p->name) == 0) { |
| 1647 | ret = 0; |
| 1648 | list_del_init(&p->list); |
| 1649 | goto out_unlock; |
| 1650 | } |
| 1651 | } |
| 1652 | out_unlock: |
| 1653 | mutex_unlock(&ftrace_cmd_mutex); |
| 1654 | |
| 1655 | return ret; |
| 1656 | } |
| 1657 | |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1658 | static int ftrace_process_regex(char *buff, int len, int enable) |
| 1659 | { |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 1660 | char *func, *command, *next = buff; |
Steven Rostedt | 6a24a24 | 2009-02-17 11:20:26 -0500 | [diff] [blame] | 1661 | struct ftrace_func_command *p; |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 1662 | int ret = -EINVAL; |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1663 | |
| 1664 | func = strsep(&next, ":"); |
| 1665 | |
| 1666 | if (!next) { |
| 1667 | ftrace_match_records(func, len, enable); |
| 1668 | return 0; |
| 1669 | } |
| 1670 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 1671 | /* command found */ |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1672 | |
| 1673 | command = strsep(&next, ":"); |
| 1674 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 1675 | mutex_lock(&ftrace_cmd_mutex); |
| 1676 | list_for_each_entry(p, &ftrace_commands, list) { |
| 1677 | if (strcmp(p->name, command) == 0) { |
| 1678 | ret = p->func(func, command, next, enable); |
| 1679 | goto out_unlock; |
| 1680 | } |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1681 | } |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 1682 | out_unlock: |
| 1683 | mutex_unlock(&ftrace_cmd_mutex); |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1684 | |
Steven Rostedt | f618077 | 2009-02-14 00:40:25 -0500 | [diff] [blame] | 1685 | return ret; |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1686 | } |
| 1687 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1688 | static ssize_t |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1689 | ftrace_regex_write(struct file *file, const char __user *ubuf, |
| 1690 | size_t cnt, loff_t *ppos, int enable) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1691 | { |
| 1692 | struct ftrace_iterator *iter; |
| 1693 | char ch; |
| 1694 | size_t read = 0; |
| 1695 | ssize_t ret; |
| 1696 | |
| 1697 | if (!cnt || cnt < 0) |
| 1698 | return 0; |
| 1699 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1700 | mutex_lock(&ftrace_regex_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1701 | |
| 1702 | if (file->f_mode & FMODE_READ) { |
| 1703 | struct seq_file *m = file->private_data; |
| 1704 | iter = m->private; |
| 1705 | } else |
| 1706 | iter = file->private_data; |
| 1707 | |
| 1708 | if (!*ppos) { |
| 1709 | iter->flags &= ~FTRACE_ITER_CONT; |
| 1710 | iter->buffer_idx = 0; |
| 1711 | } |
| 1712 | |
| 1713 | ret = get_user(ch, ubuf++); |
| 1714 | if (ret) |
| 1715 | goto out; |
| 1716 | read++; |
| 1717 | cnt--; |
| 1718 | |
| 1719 | if (!(iter->flags & ~FTRACE_ITER_CONT)) { |
| 1720 | /* skip white space */ |
| 1721 | while (cnt && isspace(ch)) { |
| 1722 | ret = get_user(ch, ubuf++); |
| 1723 | if (ret) |
| 1724 | goto out; |
| 1725 | read++; |
| 1726 | cnt--; |
| 1727 | } |
| 1728 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1729 | if (isspace(ch)) { |
| 1730 | file->f_pos += read; |
| 1731 | ret = read; |
| 1732 | goto out; |
| 1733 | } |
| 1734 | |
| 1735 | iter->buffer_idx = 0; |
| 1736 | } |
| 1737 | |
| 1738 | while (cnt && !isspace(ch)) { |
| 1739 | if (iter->buffer_idx < FTRACE_BUFF_MAX) |
| 1740 | iter->buffer[iter->buffer_idx++] = ch; |
| 1741 | else { |
| 1742 | ret = -EINVAL; |
| 1743 | goto out; |
| 1744 | } |
| 1745 | ret = get_user(ch, ubuf++); |
| 1746 | if (ret) |
| 1747 | goto out; |
| 1748 | read++; |
| 1749 | cnt--; |
| 1750 | } |
| 1751 | |
| 1752 | if (isspace(ch)) { |
| 1753 | iter->filtered++; |
| 1754 | iter->buffer[iter->buffer_idx] = 0; |
Steven Rostedt | 64e7c44 | 2009-02-13 17:08:48 -0500 | [diff] [blame] | 1755 | ret = ftrace_process_regex(iter->buffer, |
| 1756 | iter->buffer_idx, enable); |
| 1757 | if (ret) |
| 1758 | goto out; |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1759 | iter->buffer_idx = 0; |
| 1760 | } else |
| 1761 | iter->flags |= FTRACE_ITER_CONT; |
| 1762 | |
| 1763 | |
| 1764 | file->f_pos += read; |
| 1765 | |
| 1766 | ret = read; |
| 1767 | out: |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1768 | mutex_unlock(&ftrace_regex_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1769 | |
| 1770 | return ret; |
| 1771 | } |
| 1772 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1773 | static ssize_t |
| 1774 | ftrace_filter_write(struct file *file, const char __user *ubuf, |
| 1775 | size_t cnt, loff_t *ppos) |
| 1776 | { |
| 1777 | return ftrace_regex_write(file, ubuf, cnt, ppos, 1); |
| 1778 | } |
| 1779 | |
| 1780 | static ssize_t |
| 1781 | ftrace_notrace_write(struct file *file, const char __user *ubuf, |
| 1782 | size_t cnt, loff_t *ppos) |
| 1783 | { |
| 1784 | return ftrace_regex_write(file, ubuf, cnt, ppos, 0); |
| 1785 | } |
| 1786 | |
| 1787 | static void |
| 1788 | ftrace_set_regex(unsigned char *buf, int len, int reset, int enable) |
| 1789 | { |
| 1790 | if (unlikely(ftrace_disabled)) |
| 1791 | return; |
| 1792 | |
| 1793 | mutex_lock(&ftrace_regex_lock); |
| 1794 | if (reset) |
| 1795 | ftrace_filter_reset(enable); |
| 1796 | if (buf) |
Steven Rostedt | 7f24b31 | 2009-02-13 14:37:33 -0500 | [diff] [blame] | 1797 | ftrace_match_records(buf, len, enable); |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1798 | mutex_unlock(&ftrace_regex_lock); |
| 1799 | } |
| 1800 | |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1801 | /** |
| 1802 | * ftrace_set_filter - set a function to filter on in ftrace |
| 1803 | * @buf - the string that holds the function filter text. |
| 1804 | * @len - the length of the string. |
| 1805 | * @reset - non zero to reset all filters before applying this filter. |
| 1806 | * |
| 1807 | * Filters denote which functions should be enabled when tracing is enabled. |
| 1808 | * If @buf is NULL and reset is set, all functions will be enabled for tracing. |
| 1809 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1810 | void ftrace_set_filter(unsigned char *buf, int len, int reset) |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1811 | { |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1812 | ftrace_set_regex(buf, len, reset, 1); |
| 1813 | } |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 1814 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1815 | /** |
| 1816 | * ftrace_set_notrace - set a function to not trace in ftrace |
| 1817 | * @buf - the string that holds the function notrace text. |
| 1818 | * @len - the length of the string. |
| 1819 | * @reset - non zero to reset all filters before applying this filter. |
| 1820 | * |
| 1821 | * Notrace Filters denote which functions should not be enabled when tracing |
| 1822 | * is enabled. If @buf is NULL and reset is set, all functions will be enabled |
| 1823 | * for tracing. |
| 1824 | */ |
| 1825 | void ftrace_set_notrace(unsigned char *buf, int len, int reset) |
| 1826 | { |
| 1827 | ftrace_set_regex(buf, len, reset, 0); |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1828 | } |
| 1829 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1830 | static int |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1831 | ftrace_regex_release(struct inode *inode, struct file *file, int enable) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1832 | { |
| 1833 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 1834 | struct ftrace_iterator *iter; |
| 1835 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1836 | mutex_lock(&ftrace_regex_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1837 | if (file->f_mode & FMODE_READ) { |
| 1838 | iter = m->private; |
| 1839 | |
| 1840 | seq_release(inode, file); |
| 1841 | } else |
| 1842 | iter = file->private_data; |
| 1843 | |
| 1844 | if (iter->buffer_idx) { |
| 1845 | iter->filtered++; |
| 1846 | iter->buffer[iter->buffer_idx] = 0; |
Steven Rostedt | 7f24b31 | 2009-02-13 14:37:33 -0500 | [diff] [blame] | 1847 | ftrace_match_records(iter->buffer, iter->buffer_idx, enable); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1848 | } |
| 1849 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 1850 | mutex_lock(&ftrace_lock); |
Steven Rostedt | ee02a2e | 2008-11-15 16:31:41 -0500 | [diff] [blame] | 1851 | if (ftrace_start_up && ftrace_enabled) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1852 | ftrace_run_update_code(FTRACE_ENABLE_CALLS); |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 1853 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1854 | |
| 1855 | kfree(iter); |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1856 | mutex_unlock(&ftrace_regex_lock); |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1857 | return 0; |
| 1858 | } |
| 1859 | |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1860 | static int |
| 1861 | ftrace_filter_release(struct inode *inode, struct file *file) |
| 1862 | { |
| 1863 | return ftrace_regex_release(inode, file, 1); |
| 1864 | } |
| 1865 | |
| 1866 | static int |
| 1867 | ftrace_notrace_release(struct inode *inode, struct file *file) |
| 1868 | { |
| 1869 | return ftrace_regex_release(inode, file, 0); |
| 1870 | } |
| 1871 | |
Steven Rostedt | 5e2336a | 2009-03-05 21:44:55 -0500 | [diff] [blame^] | 1872 | static const struct file_operations ftrace_avail_fops = { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1873 | .open = ftrace_avail_open, |
| 1874 | .read = seq_read, |
| 1875 | .llseek = seq_lseek, |
| 1876 | .release = ftrace_avail_release, |
| 1877 | }; |
| 1878 | |
Steven Rostedt | 5e2336a | 2009-03-05 21:44:55 -0500 | [diff] [blame^] | 1879 | static const struct file_operations ftrace_failures_fops = { |
Abhishek Sagar | eb9a7bf | 2008-06-01 21:47:54 +0530 | [diff] [blame] | 1880 | .open = ftrace_failures_open, |
| 1881 | .read = seq_read, |
| 1882 | .llseek = seq_lseek, |
| 1883 | .release = ftrace_avail_release, |
| 1884 | }; |
| 1885 | |
Steven Rostedt | 5e2336a | 2009-03-05 21:44:55 -0500 | [diff] [blame^] | 1886 | static const struct file_operations ftrace_filter_fops = { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1887 | .open = ftrace_filter_open, |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1888 | .read = ftrace_regex_read, |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1889 | .write = ftrace_filter_write, |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1890 | .llseek = ftrace_regex_lseek, |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1891 | .release = ftrace_filter_release, |
| 1892 | }; |
| 1893 | |
Steven Rostedt | 5e2336a | 2009-03-05 21:44:55 -0500 | [diff] [blame^] | 1894 | static const struct file_operations ftrace_notrace_fops = { |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 1895 | .open = ftrace_notrace_open, |
| 1896 | .read = ftrace_regex_read, |
| 1897 | .write = ftrace_notrace_write, |
| 1898 | .llseek = ftrace_regex_lseek, |
| 1899 | .release = ftrace_notrace_release, |
| 1900 | }; |
| 1901 | |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 1902 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 1903 | |
| 1904 | static DEFINE_MUTEX(graph_lock); |
| 1905 | |
| 1906 | int ftrace_graph_count; |
| 1907 | unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS] __read_mostly; |
| 1908 | |
| 1909 | static void * |
| 1910 | g_next(struct seq_file *m, void *v, loff_t *pos) |
| 1911 | { |
| 1912 | unsigned long *array = m->private; |
| 1913 | int index = *pos; |
| 1914 | |
| 1915 | (*pos)++; |
| 1916 | |
| 1917 | if (index >= ftrace_graph_count) |
| 1918 | return NULL; |
| 1919 | |
| 1920 | return &array[index]; |
| 1921 | } |
| 1922 | |
| 1923 | static void *g_start(struct seq_file *m, loff_t *pos) |
| 1924 | { |
| 1925 | void *p = NULL; |
| 1926 | |
| 1927 | mutex_lock(&graph_lock); |
| 1928 | |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 1929 | /* Nothing, tell g_show to print all functions are enabled */ |
| 1930 | if (!ftrace_graph_count && !*pos) |
| 1931 | return (void *)1; |
| 1932 | |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 1933 | p = g_next(m, p, pos); |
| 1934 | |
| 1935 | return p; |
| 1936 | } |
| 1937 | |
| 1938 | static void g_stop(struct seq_file *m, void *p) |
| 1939 | { |
| 1940 | mutex_unlock(&graph_lock); |
| 1941 | } |
| 1942 | |
| 1943 | static int g_show(struct seq_file *m, void *v) |
| 1944 | { |
| 1945 | unsigned long *ptr = v; |
| 1946 | char str[KSYM_SYMBOL_LEN]; |
| 1947 | |
| 1948 | if (!ptr) |
| 1949 | return 0; |
| 1950 | |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 1951 | if (ptr == (unsigned long *)1) { |
| 1952 | seq_printf(m, "#### all functions enabled ####\n"); |
| 1953 | return 0; |
| 1954 | } |
| 1955 | |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 1956 | kallsyms_lookup(*ptr, NULL, NULL, NULL, str); |
| 1957 | |
| 1958 | seq_printf(m, "%s\n", str); |
| 1959 | |
| 1960 | return 0; |
| 1961 | } |
| 1962 | |
| 1963 | static struct seq_operations ftrace_graph_seq_ops = { |
| 1964 | .start = g_start, |
| 1965 | .next = g_next, |
| 1966 | .stop = g_stop, |
| 1967 | .show = g_show, |
| 1968 | }; |
| 1969 | |
| 1970 | static int |
| 1971 | ftrace_graph_open(struct inode *inode, struct file *file) |
| 1972 | { |
| 1973 | int ret = 0; |
| 1974 | |
| 1975 | if (unlikely(ftrace_disabled)) |
| 1976 | return -ENODEV; |
| 1977 | |
| 1978 | mutex_lock(&graph_lock); |
| 1979 | if ((file->f_mode & FMODE_WRITE) && |
| 1980 | !(file->f_flags & O_APPEND)) { |
| 1981 | ftrace_graph_count = 0; |
| 1982 | memset(ftrace_graph_funcs, 0, sizeof(ftrace_graph_funcs)); |
| 1983 | } |
| 1984 | |
| 1985 | if (file->f_mode & FMODE_READ) { |
| 1986 | ret = seq_open(file, &ftrace_graph_seq_ops); |
| 1987 | if (!ret) { |
| 1988 | struct seq_file *m = file->private_data; |
| 1989 | m->private = ftrace_graph_funcs; |
| 1990 | } |
| 1991 | } else |
| 1992 | file->private_data = ftrace_graph_funcs; |
| 1993 | mutex_unlock(&graph_lock); |
| 1994 | |
| 1995 | return ret; |
| 1996 | } |
| 1997 | |
| 1998 | static ssize_t |
| 1999 | ftrace_graph_read(struct file *file, char __user *ubuf, |
| 2000 | size_t cnt, loff_t *ppos) |
| 2001 | { |
| 2002 | if (file->f_mode & FMODE_READ) |
| 2003 | return seq_read(file, ubuf, cnt, ppos); |
| 2004 | else |
| 2005 | return -EPERM; |
| 2006 | } |
| 2007 | |
| 2008 | static int |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 2009 | ftrace_set_func(unsigned long *array, int *idx, char *buffer) |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 2010 | { |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 2011 | struct dyn_ftrace *rec; |
| 2012 | struct ftrace_page *pg; |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 2013 | int search_len; |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 2014 | int found = 0; |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 2015 | int type, not; |
| 2016 | char *search; |
| 2017 | bool exists; |
| 2018 | int i; |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 2019 | |
| 2020 | if (ftrace_disabled) |
| 2021 | return -ENODEV; |
| 2022 | |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 2023 | /* decode regex */ |
| 2024 | type = ftrace_setup_glob(buffer, strlen(buffer), &search, ¬); |
| 2025 | if (not) |
| 2026 | return -EINVAL; |
| 2027 | |
| 2028 | search_len = strlen(search); |
| 2029 | |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 2030 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 2031 | do_for_each_ftrace_rec(pg, rec) { |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 2032 | |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 2033 | if (*idx >= FTRACE_GRAPH_MAX_FUNCS) |
| 2034 | break; |
| 2035 | |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 2036 | if (rec->flags & (FTRACE_FL_FAILED | FTRACE_FL_FREE)) |
| 2037 | continue; |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 2038 | |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 2039 | if (ftrace_match_record(rec, search, search_len, type)) { |
| 2040 | /* ensure it is not already in the array */ |
| 2041 | exists = false; |
| 2042 | for (i = 0; i < *idx; i++) |
| 2043 | if (array[i] == rec->ip) { |
| 2044 | exists = true; |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 2045 | break; |
| 2046 | } |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 2047 | if (!exists) { |
| 2048 | array[(*idx)++] = rec->ip; |
| 2049 | found = 1; |
| 2050 | } |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 2051 | } |
Steven Rostedt | 265c831 | 2009-02-13 12:43:56 -0500 | [diff] [blame] | 2052 | } while_for_each_ftrace_rec(); |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 2053 | |
Steven Rostedt | 52baf11 | 2009-02-14 01:15:39 -0500 | [diff] [blame] | 2054 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 2055 | |
| 2056 | return found ? 0 : -EINVAL; |
| 2057 | } |
| 2058 | |
| 2059 | static ssize_t |
| 2060 | ftrace_graph_write(struct file *file, const char __user *ubuf, |
| 2061 | size_t cnt, loff_t *ppos) |
| 2062 | { |
| 2063 | unsigned char buffer[FTRACE_BUFF_MAX+1]; |
| 2064 | unsigned long *array; |
| 2065 | size_t read = 0; |
| 2066 | ssize_t ret; |
| 2067 | int index = 0; |
| 2068 | char ch; |
| 2069 | |
| 2070 | if (!cnt || cnt < 0) |
| 2071 | return 0; |
| 2072 | |
| 2073 | mutex_lock(&graph_lock); |
| 2074 | |
| 2075 | if (ftrace_graph_count >= FTRACE_GRAPH_MAX_FUNCS) { |
| 2076 | ret = -EBUSY; |
| 2077 | goto out; |
| 2078 | } |
| 2079 | |
| 2080 | if (file->f_mode & FMODE_READ) { |
| 2081 | struct seq_file *m = file->private_data; |
| 2082 | array = m->private; |
| 2083 | } else |
| 2084 | array = file->private_data; |
| 2085 | |
| 2086 | ret = get_user(ch, ubuf++); |
| 2087 | if (ret) |
| 2088 | goto out; |
| 2089 | read++; |
| 2090 | cnt--; |
| 2091 | |
| 2092 | /* skip white space */ |
| 2093 | while (cnt && isspace(ch)) { |
| 2094 | ret = get_user(ch, ubuf++); |
| 2095 | if (ret) |
| 2096 | goto out; |
| 2097 | read++; |
| 2098 | cnt--; |
| 2099 | } |
| 2100 | |
| 2101 | if (isspace(ch)) { |
| 2102 | *ppos += read; |
| 2103 | ret = read; |
| 2104 | goto out; |
| 2105 | } |
| 2106 | |
| 2107 | while (cnt && !isspace(ch)) { |
| 2108 | if (index < FTRACE_BUFF_MAX) |
| 2109 | buffer[index++] = ch; |
| 2110 | else { |
| 2111 | ret = -EINVAL; |
| 2112 | goto out; |
| 2113 | } |
| 2114 | ret = get_user(ch, ubuf++); |
| 2115 | if (ret) |
| 2116 | goto out; |
| 2117 | read++; |
| 2118 | cnt--; |
| 2119 | } |
| 2120 | buffer[index] = 0; |
| 2121 | |
Frederic Weisbecker | f9349a8 | 2009-02-19 21:13:12 +0100 | [diff] [blame] | 2122 | /* we allow only one expression at a time */ |
| 2123 | ret = ftrace_set_func(array, &ftrace_graph_count, buffer); |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 2124 | if (ret) |
| 2125 | goto out; |
| 2126 | |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 2127 | file->f_pos += read; |
| 2128 | |
| 2129 | ret = read; |
| 2130 | out: |
| 2131 | mutex_unlock(&graph_lock); |
| 2132 | |
| 2133 | return ret; |
| 2134 | } |
| 2135 | |
| 2136 | static const struct file_operations ftrace_graph_fops = { |
| 2137 | .open = ftrace_graph_open, |
| 2138 | .read = ftrace_graph_read, |
| 2139 | .write = ftrace_graph_write, |
| 2140 | }; |
| 2141 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| 2142 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2143 | static __init int ftrace_init_dyn_debugfs(struct dentry *d_tracer) |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2144 | { |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2145 | struct dentry *entry; |
| 2146 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2147 | entry = debugfs_create_file("available_filter_functions", 0444, |
| 2148 | d_tracer, NULL, &ftrace_avail_fops); |
| 2149 | if (!entry) |
| 2150 | pr_warning("Could not create debugfs " |
| 2151 | "'available_filter_functions' entry\n"); |
| 2152 | |
Abhishek Sagar | eb9a7bf | 2008-06-01 21:47:54 +0530 | [diff] [blame] | 2153 | entry = debugfs_create_file("failures", 0444, |
| 2154 | d_tracer, NULL, &ftrace_failures_fops); |
| 2155 | if (!entry) |
| 2156 | pr_warning("Could not create debugfs 'failures' entry\n"); |
| 2157 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2158 | entry = debugfs_create_file("set_ftrace_filter", 0644, d_tracer, |
| 2159 | NULL, &ftrace_filter_fops); |
| 2160 | if (!entry) |
| 2161 | pr_warning("Could not create debugfs " |
| 2162 | "'set_ftrace_filter' entry\n"); |
Steven Rostedt | 41c52c0 | 2008-05-22 11:46:33 -0400 | [diff] [blame] | 2163 | |
| 2164 | entry = debugfs_create_file("set_ftrace_notrace", 0644, d_tracer, |
| 2165 | NULL, &ftrace_notrace_fops); |
| 2166 | if (!entry) |
| 2167 | pr_warning("Could not create debugfs " |
| 2168 | "'set_ftrace_notrace' entry\n"); |
Steven Rostedt | ad90c0e | 2008-05-27 20:48:37 -0400 | [diff] [blame] | 2169 | |
Steven Rostedt | ea4e2bc | 2008-12-03 15:36:57 -0500 | [diff] [blame] | 2170 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 2171 | entry = debugfs_create_file("set_graph_function", 0444, d_tracer, |
| 2172 | NULL, |
| 2173 | &ftrace_graph_fops); |
| 2174 | if (!entry) |
| 2175 | pr_warning("Could not create debugfs " |
| 2176 | "'set_graph_function' entry\n"); |
| 2177 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| 2178 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2179 | return 0; |
| 2180 | } |
| 2181 | |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 2182 | static int ftrace_convert_nops(struct module *mod, |
| 2183 | unsigned long *start, |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 2184 | unsigned long *end) |
| 2185 | { |
| 2186 | unsigned long *p; |
| 2187 | unsigned long addr; |
| 2188 | unsigned long flags; |
| 2189 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2190 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 2191 | p = start; |
| 2192 | while (p < end) { |
| 2193 | addr = ftrace_call_adjust(*p++); |
Steven Rostedt | 20e5227 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 2194 | /* |
| 2195 | * Some architecture linkers will pad between |
| 2196 | * the different mcount_loc sections of different |
| 2197 | * object files to satisfy alignments. |
| 2198 | * Skip any NULL pointers. |
| 2199 | */ |
| 2200 | if (!addr) |
| 2201 | continue; |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 2202 | ftrace_record_ip(addr); |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 2203 | } |
| 2204 | |
Steven Rostedt | 08f5ac90 | 2008-10-23 09:33:07 -0400 | [diff] [blame] | 2205 | /* disable interrupts to prevent kstop machine */ |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 2206 | local_irq_save(flags); |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 2207 | ftrace_update_code(mod); |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 2208 | local_irq_restore(flags); |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2209 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 2210 | |
| 2211 | return 0; |
| 2212 | } |
| 2213 | |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 2214 | void ftrace_init_module(struct module *mod, |
| 2215 | unsigned long *start, unsigned long *end) |
Steven Rostedt | 90d595f | 2008-08-14 15:45:09 -0400 | [diff] [blame] | 2216 | { |
Steven Rostedt | 00fd61a | 2008-08-15 21:40:04 -0400 | [diff] [blame] | 2217 | if (ftrace_disabled || start == end) |
Steven Rostedt | fed1939 | 2008-08-14 22:47:19 -0400 | [diff] [blame] | 2218 | return; |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 2219 | ftrace_convert_nops(mod, start, end); |
Steven Rostedt | 90d595f | 2008-08-14 15:45:09 -0400 | [diff] [blame] | 2220 | } |
| 2221 | |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 2222 | extern unsigned long __start_mcount_loc[]; |
| 2223 | extern unsigned long __stop_mcount_loc[]; |
| 2224 | |
| 2225 | void __init ftrace_init(void) |
| 2226 | { |
| 2227 | unsigned long count, addr, flags; |
| 2228 | int ret; |
| 2229 | |
| 2230 | /* Keep the ftrace pointer to the stub */ |
| 2231 | addr = (unsigned long)ftrace_stub; |
| 2232 | |
| 2233 | local_irq_save(flags); |
| 2234 | ftrace_dyn_arch_init(&addr); |
| 2235 | local_irq_restore(flags); |
| 2236 | |
| 2237 | /* ftrace_dyn_arch_init places the return code in addr */ |
| 2238 | if (addr) |
| 2239 | goto failed; |
| 2240 | |
| 2241 | count = __stop_mcount_loc - __start_mcount_loc; |
| 2242 | |
| 2243 | ret = ftrace_dyn_table_alloc(count); |
| 2244 | if (ret) |
| 2245 | goto failed; |
| 2246 | |
| 2247 | last_ftrace_enabled = ftrace_enabled = 1; |
| 2248 | |
Steven Rostedt | 31e8890 | 2008-11-14 16:21:19 -0800 | [diff] [blame] | 2249 | ret = ftrace_convert_nops(NULL, |
| 2250 | __start_mcount_loc, |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 2251 | __stop_mcount_loc); |
| 2252 | |
| 2253 | return; |
| 2254 | failed: |
| 2255 | ftrace_disabled = 1; |
| 2256 | } |
Steven Rostedt | 68bf21a | 2008-08-14 15:45:08 -0400 | [diff] [blame] | 2257 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2258 | #else |
Frederic Weisbecker | 0b6e4d5 | 2008-10-28 20:17:38 +0100 | [diff] [blame] | 2259 | |
| 2260 | static int __init ftrace_nodyn_init(void) |
| 2261 | { |
| 2262 | ftrace_enabled = 1; |
| 2263 | return 0; |
| 2264 | } |
| 2265 | device_initcall(ftrace_nodyn_init); |
| 2266 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2267 | static inline int ftrace_init_dyn_debugfs(struct dentry *d_tracer) { return 0; } |
| 2268 | static inline void ftrace_startup_enable(int command) { } |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 2269 | /* Keep as macros so we do not need to define the commands */ |
| 2270 | # define ftrace_startup(command) do { } while (0) |
| 2271 | # define ftrace_shutdown(command) do { } while (0) |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2272 | # define ftrace_startup_sysctl() do { } while (0) |
| 2273 | # define ftrace_shutdown_sysctl() do { } while (0) |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2274 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
| 2275 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2276 | static ssize_t |
| 2277 | ftrace_pid_read(struct file *file, char __user *ubuf, |
| 2278 | size_t cnt, loff_t *ppos) |
| 2279 | { |
| 2280 | char buf[64]; |
| 2281 | int r; |
| 2282 | |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 2283 | if (ftrace_pid_trace == ftrace_swapper_pid) |
| 2284 | r = sprintf(buf, "swapper tasks\n"); |
| 2285 | else if (ftrace_pid_trace) |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2286 | r = sprintf(buf, "%u\n", pid_nr(ftrace_pid_trace)); |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2287 | else |
| 2288 | r = sprintf(buf, "no pid\n"); |
| 2289 | |
| 2290 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 2291 | } |
| 2292 | |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 2293 | static void clear_ftrace_swapper(void) |
| 2294 | { |
| 2295 | struct task_struct *p; |
| 2296 | int cpu; |
| 2297 | |
| 2298 | get_online_cpus(); |
| 2299 | for_each_online_cpu(cpu) { |
| 2300 | p = idle_task(cpu); |
| 2301 | clear_tsk_trace_trace(p); |
| 2302 | } |
| 2303 | put_online_cpus(); |
| 2304 | } |
| 2305 | |
| 2306 | static void set_ftrace_swapper(void) |
| 2307 | { |
| 2308 | struct task_struct *p; |
| 2309 | int cpu; |
| 2310 | |
| 2311 | get_online_cpus(); |
| 2312 | for_each_online_cpu(cpu) { |
| 2313 | p = idle_task(cpu); |
| 2314 | set_tsk_trace_trace(p); |
| 2315 | } |
| 2316 | put_online_cpus(); |
| 2317 | } |
| 2318 | |
| 2319 | static void clear_ftrace_pid(struct pid *pid) |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2320 | { |
| 2321 | struct task_struct *p; |
| 2322 | |
Oleg Nesterov | 229c4ef | 2009-02-03 20:39:04 +0100 | [diff] [blame] | 2323 | rcu_read_lock(); |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 2324 | do_each_pid_task(pid, PIDTYPE_PID, p) { |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2325 | clear_tsk_trace_trace(p); |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 2326 | } while_each_pid_task(pid, PIDTYPE_PID, p); |
Oleg Nesterov | 229c4ef | 2009-02-03 20:39:04 +0100 | [diff] [blame] | 2327 | rcu_read_unlock(); |
| 2328 | |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 2329 | put_pid(pid); |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2330 | } |
| 2331 | |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 2332 | static void set_ftrace_pid(struct pid *pid) |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2333 | { |
| 2334 | struct task_struct *p; |
| 2335 | |
Oleg Nesterov | 229c4ef | 2009-02-03 20:39:04 +0100 | [diff] [blame] | 2336 | rcu_read_lock(); |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2337 | do_each_pid_task(pid, PIDTYPE_PID, p) { |
| 2338 | set_tsk_trace_trace(p); |
| 2339 | } while_each_pid_task(pid, PIDTYPE_PID, p); |
Oleg Nesterov | 229c4ef | 2009-02-03 20:39:04 +0100 | [diff] [blame] | 2340 | rcu_read_unlock(); |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2341 | } |
| 2342 | |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 2343 | static void clear_ftrace_pid_task(struct pid **pid) |
| 2344 | { |
| 2345 | if (*pid == ftrace_swapper_pid) |
| 2346 | clear_ftrace_swapper(); |
| 2347 | else |
| 2348 | clear_ftrace_pid(*pid); |
| 2349 | |
| 2350 | *pid = NULL; |
| 2351 | } |
| 2352 | |
| 2353 | static void set_ftrace_pid_task(struct pid *pid) |
| 2354 | { |
| 2355 | if (pid == ftrace_swapper_pid) |
| 2356 | set_ftrace_swapper(); |
| 2357 | else |
| 2358 | set_ftrace_pid(pid); |
| 2359 | } |
| 2360 | |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2361 | static ssize_t |
| 2362 | ftrace_pid_write(struct file *filp, const char __user *ubuf, |
| 2363 | size_t cnt, loff_t *ppos) |
| 2364 | { |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2365 | struct pid *pid; |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2366 | char buf[64]; |
| 2367 | long val; |
| 2368 | int ret; |
| 2369 | |
| 2370 | if (cnt >= sizeof(buf)) |
| 2371 | return -EINVAL; |
| 2372 | |
| 2373 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2374 | return -EFAULT; |
| 2375 | |
| 2376 | buf[cnt] = 0; |
| 2377 | |
| 2378 | ret = strict_strtol(buf, 10, &val); |
| 2379 | if (ret < 0) |
| 2380 | return ret; |
| 2381 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2382 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2383 | if (val < 0) { |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2384 | /* disable pid tracing */ |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2385 | if (!ftrace_pid_trace) |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2386 | goto out; |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2387 | |
| 2388 | clear_ftrace_pid_task(&ftrace_pid_trace); |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2389 | |
| 2390 | } else { |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 2391 | /* swapper task is special */ |
| 2392 | if (!val) { |
| 2393 | pid = ftrace_swapper_pid; |
| 2394 | if (pid == ftrace_pid_trace) |
| 2395 | goto out; |
| 2396 | } else { |
| 2397 | pid = find_get_pid(val); |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2398 | |
Steven Rostedt | e32d895 | 2008-12-04 00:26:41 -0500 | [diff] [blame] | 2399 | if (pid == ftrace_pid_trace) { |
| 2400 | put_pid(pid); |
| 2401 | goto out; |
| 2402 | } |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2403 | } |
| 2404 | |
| 2405 | if (ftrace_pid_trace) |
| 2406 | clear_ftrace_pid_task(&ftrace_pid_trace); |
| 2407 | |
| 2408 | if (!pid) |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2409 | goto out; |
| 2410 | |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2411 | ftrace_pid_trace = pid; |
Steven Rostedt | 0ef8cde | 2008-12-03 15:36:58 -0500 | [diff] [blame] | 2412 | |
Steven Rostedt | 978f3a4 | 2008-12-04 00:26:40 -0500 | [diff] [blame] | 2413 | set_ftrace_pid_task(ftrace_pid_trace); |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2414 | } |
| 2415 | |
| 2416 | /* update the function call */ |
| 2417 | ftrace_update_pid_func(); |
| 2418 | ftrace_startup_enable(0); |
| 2419 | |
| 2420 | out: |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2421 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2422 | |
| 2423 | return cnt; |
| 2424 | } |
| 2425 | |
Steven Rostedt | 5e2336a | 2009-03-05 21:44:55 -0500 | [diff] [blame^] | 2426 | static const struct file_operations ftrace_pid_fops = { |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2427 | .read = ftrace_pid_read, |
| 2428 | .write = ftrace_pid_write, |
| 2429 | }; |
| 2430 | |
| 2431 | static __init int ftrace_init_debugfs(void) |
| 2432 | { |
| 2433 | struct dentry *d_tracer; |
| 2434 | struct dentry *entry; |
| 2435 | |
| 2436 | d_tracer = tracing_init_dentry(); |
| 2437 | if (!d_tracer) |
| 2438 | return 0; |
| 2439 | |
| 2440 | ftrace_init_dyn_debugfs(d_tracer); |
| 2441 | |
| 2442 | entry = debugfs_create_file("set_ftrace_pid", 0644, d_tracer, |
| 2443 | NULL, &ftrace_pid_fops); |
| 2444 | if (!entry) |
| 2445 | pr_warning("Could not create debugfs " |
| 2446 | "'set_ftrace_pid' entry\n"); |
| 2447 | return 0; |
| 2448 | } |
Steven Rostedt | df4fc31 | 2008-11-26 00:16:23 -0500 | [diff] [blame] | 2449 | fs_initcall(ftrace_init_debugfs); |
| 2450 | |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2451 | /** |
Steven Rostedt | 81adbdc | 2008-10-23 09:33:02 -0400 | [diff] [blame] | 2452 | * ftrace_kill - kill ftrace |
Steven Rostedt | a2bb6a3 | 2008-07-10 20:58:15 -0400 | [diff] [blame] | 2453 | * |
| 2454 | * This function should be used by panic code. It stops ftrace |
| 2455 | * but in a not so nice way. If you need to simply kill ftrace |
| 2456 | * from a non-atomic section, use ftrace_kill. |
| 2457 | */ |
Steven Rostedt | 81adbdc | 2008-10-23 09:33:02 -0400 | [diff] [blame] | 2458 | void ftrace_kill(void) |
Steven Rostedt | a2bb6a3 | 2008-07-10 20:58:15 -0400 | [diff] [blame] | 2459 | { |
| 2460 | ftrace_disabled = 1; |
| 2461 | ftrace_enabled = 0; |
Steven Rostedt | a2bb6a3 | 2008-07-10 20:58:15 -0400 | [diff] [blame] | 2462 | clear_ftrace_function(); |
| 2463 | } |
| 2464 | |
| 2465 | /** |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2466 | * register_ftrace_function - register a function for profiling |
| 2467 | * @ops - ops structure that holds the function for profiling. |
| 2468 | * |
| 2469 | * Register a function to be called by all functions in the |
| 2470 | * kernel. |
| 2471 | * |
| 2472 | * Note: @ops->func and all the functions it calls must be labeled |
| 2473 | * with "notrace", otherwise it will go into a |
| 2474 | * recursive loop. |
| 2475 | */ |
| 2476 | int register_ftrace_function(struct ftrace_ops *ops) |
| 2477 | { |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2478 | int ret; |
| 2479 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2480 | if (unlikely(ftrace_disabled)) |
| 2481 | return -1; |
| 2482 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2483 | mutex_lock(&ftrace_lock); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 2484 | |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2485 | ret = __register_ftrace_function(ops); |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 2486 | ftrace_startup(0); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2487 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2488 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2489 | return ret; |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2490 | } |
| 2491 | |
| 2492 | /** |
Uwe Kleine-Koenig | 3263292 | 2009-01-12 23:35:50 +0100 | [diff] [blame] | 2493 | * unregister_ftrace_function - unregister a function for profiling. |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2494 | * @ops - ops structure that holds the function to unregister |
| 2495 | * |
| 2496 | * Unregister a function that was added to be called by ftrace profiling. |
| 2497 | */ |
| 2498 | int unregister_ftrace_function(struct ftrace_ops *ops) |
| 2499 | { |
| 2500 | int ret; |
| 2501 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2502 | mutex_lock(&ftrace_lock); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2503 | ret = __unregister_ftrace_function(ops); |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 2504 | ftrace_shutdown(0); |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2505 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2506 | |
| 2507 | return ret; |
| 2508 | } |
| 2509 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 2510 | int |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2511 | ftrace_enable_sysctl(struct ctl_table *table, int write, |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2512 | struct file *file, void __user *buffer, size_t *lenp, |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2513 | loff_t *ppos) |
| 2514 | { |
| 2515 | int ret; |
| 2516 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2517 | if (unlikely(ftrace_disabled)) |
| 2518 | return -ENODEV; |
| 2519 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2520 | mutex_lock(&ftrace_lock); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2521 | |
Steven Rostedt | 5072c59 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2522 | ret = proc_dointvec(table, write, file, buffer, lenp, ppos); |
Steven Rostedt | b0fc494 | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2523 | |
| 2524 | if (ret || !write || (last_ftrace_enabled == ftrace_enabled)) |
| 2525 | goto out; |
| 2526 | |
| 2527 | last_ftrace_enabled = ftrace_enabled; |
| 2528 | |
| 2529 | if (ftrace_enabled) { |
| 2530 | |
| 2531 | ftrace_startup_sysctl(); |
| 2532 | |
| 2533 | /* we are starting ftrace again */ |
| 2534 | if (ftrace_list != &ftrace_list_end) { |
| 2535 | if (ftrace_list->next == &ftrace_list_end) |
| 2536 | ftrace_trace_function = ftrace_list->func; |
| 2537 | else |
| 2538 | ftrace_trace_function = ftrace_list_func; |
| 2539 | } |
| 2540 | |
| 2541 | } else { |
| 2542 | /* stopping ftrace calls (just send to ftrace_stub) */ |
| 2543 | ftrace_trace_function = ftrace_stub; |
| 2544 | |
| 2545 | ftrace_shutdown_sysctl(); |
| 2546 | } |
| 2547 | |
| 2548 | out: |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2549 | mutex_unlock(&ftrace_lock); |
Steven Rostedt | 3d08339 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2550 | return ret; |
Arnaldo Carvalho de Melo | 16444a8 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2551 | } |
Ingo Molnar | f17845e | 2008-10-24 12:47:10 +0200 | [diff] [blame] | 2552 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 2553 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 2554 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 2555 | static atomic_t ftrace_graph_active; |
Frederic Weisbecker | 4a2b8dd | 2009-01-14 13:33:27 -0800 | [diff] [blame] | 2556 | static struct notifier_block ftrace_suspend_notifier; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2557 | |
Steven Rostedt | e49dc19 | 2008-12-02 23:50:05 -0500 | [diff] [blame] | 2558 | int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace) |
| 2559 | { |
| 2560 | return 0; |
| 2561 | } |
| 2562 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 2563 | /* The callbacks that hook a function */ |
| 2564 | trace_func_graph_ret_t ftrace_graph_return = |
| 2565 | (trace_func_graph_ret_t)ftrace_stub; |
Steven Rostedt | e49dc19 | 2008-12-02 23:50:05 -0500 | [diff] [blame] | 2566 | trace_func_graph_ent_t ftrace_graph_entry = ftrace_graph_entry_stub; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2567 | |
| 2568 | /* Try to assign a return stack array on FTRACE_RETSTACK_ALLOC_SIZE tasks. */ |
| 2569 | static int alloc_retstack_tasklist(struct ftrace_ret_stack **ret_stack_list) |
| 2570 | { |
| 2571 | int i; |
| 2572 | int ret = 0; |
| 2573 | unsigned long flags; |
| 2574 | int start = 0, end = FTRACE_RETSTACK_ALLOC_SIZE; |
| 2575 | struct task_struct *g, *t; |
| 2576 | |
| 2577 | for (i = 0; i < FTRACE_RETSTACK_ALLOC_SIZE; i++) { |
| 2578 | ret_stack_list[i] = kmalloc(FTRACE_RETFUNC_DEPTH |
| 2579 | * sizeof(struct ftrace_ret_stack), |
| 2580 | GFP_KERNEL); |
| 2581 | if (!ret_stack_list[i]) { |
| 2582 | start = 0; |
| 2583 | end = i; |
| 2584 | ret = -ENOMEM; |
| 2585 | goto free; |
| 2586 | } |
| 2587 | } |
| 2588 | |
| 2589 | read_lock_irqsave(&tasklist_lock, flags); |
| 2590 | do_each_thread(g, t) { |
| 2591 | if (start == end) { |
| 2592 | ret = -EAGAIN; |
| 2593 | goto unlock; |
| 2594 | } |
| 2595 | |
| 2596 | if (t->ret_stack == NULL) { |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2597 | t->curr_ret_stack = -1; |
Frederic Weisbecker | 48d68b2 | 2008-12-02 00:20:39 +0100 | [diff] [blame] | 2598 | /* Make sure IRQs see the -1 first: */ |
| 2599 | barrier(); |
| 2600 | t->ret_stack = ret_stack_list[start++]; |
Frederic Weisbecker | 380c4b1 | 2008-12-06 03:43:41 +0100 | [diff] [blame] | 2601 | atomic_set(&t->tracing_graph_pause, 0); |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2602 | atomic_set(&t->trace_overrun, 0); |
| 2603 | } |
| 2604 | } while_each_thread(g, t); |
| 2605 | |
| 2606 | unlock: |
| 2607 | read_unlock_irqrestore(&tasklist_lock, flags); |
| 2608 | free: |
| 2609 | for (i = start; i < end; i++) |
| 2610 | kfree(ret_stack_list[i]); |
| 2611 | return ret; |
| 2612 | } |
| 2613 | |
| 2614 | /* Allocate a return stack for each task */ |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 2615 | static int start_graph_tracing(void) |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2616 | { |
| 2617 | struct ftrace_ret_stack **ret_stack_list; |
Frederic Weisbecker | 5b058bc | 2009-02-17 18:35:34 +0100 | [diff] [blame] | 2618 | int ret, cpu; |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2619 | |
| 2620 | ret_stack_list = kmalloc(FTRACE_RETSTACK_ALLOC_SIZE * |
| 2621 | sizeof(struct ftrace_ret_stack *), |
| 2622 | GFP_KERNEL); |
| 2623 | |
| 2624 | if (!ret_stack_list) |
| 2625 | return -ENOMEM; |
| 2626 | |
Frederic Weisbecker | 5b058bc | 2009-02-17 18:35:34 +0100 | [diff] [blame] | 2627 | /* The cpu_boot init_task->ret_stack will never be freed */ |
| 2628 | for_each_online_cpu(cpu) |
| 2629 | ftrace_graph_init_task(idle_task(cpu)); |
| 2630 | |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2631 | do { |
| 2632 | ret = alloc_retstack_tasklist(ret_stack_list); |
| 2633 | } while (ret == -EAGAIN); |
| 2634 | |
| 2635 | kfree(ret_stack_list); |
| 2636 | return ret; |
| 2637 | } |
| 2638 | |
Frederic Weisbecker | 4a2b8dd | 2009-01-14 13:33:27 -0800 | [diff] [blame] | 2639 | /* |
| 2640 | * Hibernation protection. |
| 2641 | * The state of the current task is too much unstable during |
| 2642 | * suspend/restore to disk. We want to protect against that. |
| 2643 | */ |
| 2644 | static int |
| 2645 | ftrace_suspend_notifier_call(struct notifier_block *bl, unsigned long state, |
| 2646 | void *unused) |
| 2647 | { |
| 2648 | switch (state) { |
| 2649 | case PM_HIBERNATION_PREPARE: |
| 2650 | pause_graph_tracing(); |
| 2651 | break; |
| 2652 | |
| 2653 | case PM_POST_HIBERNATION: |
| 2654 | unpause_graph_tracing(); |
| 2655 | break; |
| 2656 | } |
| 2657 | return NOTIFY_DONE; |
| 2658 | } |
| 2659 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 2660 | int register_ftrace_graph(trace_func_graph_ret_t retfunc, |
| 2661 | trace_func_graph_ent_t entryfunc) |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 2662 | { |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 2663 | int ret = 0; |
| 2664 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2665 | mutex_lock(&ftrace_lock); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 2666 | |
Frederic Weisbecker | 4a2b8dd | 2009-01-14 13:33:27 -0800 | [diff] [blame] | 2667 | ftrace_suspend_notifier.notifier_call = ftrace_suspend_notifier_call; |
| 2668 | register_pm_notifier(&ftrace_suspend_notifier); |
| 2669 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 2670 | atomic_inc(&ftrace_graph_active); |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 2671 | ret = start_graph_tracing(); |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2672 | if (ret) { |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 2673 | atomic_dec(&ftrace_graph_active); |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2674 | goto out; |
| 2675 | } |
Steven Rostedt | e53a631 | 2008-11-26 00:16:25 -0500 | [diff] [blame] | 2676 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 2677 | ftrace_graph_return = retfunc; |
| 2678 | ftrace_graph_entry = entryfunc; |
Steven Rostedt | e53a631 | 2008-11-26 00:16:25 -0500 | [diff] [blame] | 2679 | |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 2680 | ftrace_startup(FTRACE_START_FUNC_RET); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 2681 | |
| 2682 | out: |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2683 | mutex_unlock(&ftrace_lock); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 2684 | return ret; |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 2685 | } |
| 2686 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 2687 | void unregister_ftrace_graph(void) |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 2688 | { |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2689 | mutex_lock(&ftrace_lock); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 2690 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 2691 | atomic_dec(&ftrace_graph_active); |
| 2692 | ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub; |
Steven Rostedt | e49dc19 | 2008-12-02 23:50:05 -0500 | [diff] [blame] | 2693 | ftrace_graph_entry = ftrace_graph_entry_stub; |
Steven Rostedt | 5a45cfe | 2008-11-26 00:16:24 -0500 | [diff] [blame] | 2694 | ftrace_shutdown(FTRACE_STOP_FUNC_RET); |
Frederic Weisbecker | 4a2b8dd | 2009-01-14 13:33:27 -0800 | [diff] [blame] | 2695 | unregister_pm_notifier(&ftrace_suspend_notifier); |
Frederic Weisbecker | e7d3737 | 2008-11-16 06:02:06 +0100 | [diff] [blame] | 2696 | |
Steven Rostedt | e6ea44e | 2009-02-14 01:42:44 -0500 | [diff] [blame] | 2697 | mutex_unlock(&ftrace_lock); |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 2698 | } |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2699 | |
| 2700 | /* Allocate a return stack for newly created task */ |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 2701 | void ftrace_graph_init_task(struct task_struct *t) |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2702 | { |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 2703 | if (atomic_read(&ftrace_graph_active)) { |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2704 | t->ret_stack = kmalloc(FTRACE_RETFUNC_DEPTH |
| 2705 | * sizeof(struct ftrace_ret_stack), |
| 2706 | GFP_KERNEL); |
| 2707 | if (!t->ret_stack) |
| 2708 | return; |
| 2709 | t->curr_ret_stack = -1; |
Frederic Weisbecker | 380c4b1 | 2008-12-06 03:43:41 +0100 | [diff] [blame] | 2710 | atomic_set(&t->tracing_graph_pause, 0); |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2711 | atomic_set(&t->trace_overrun, 0); |
| 2712 | } else |
| 2713 | t->ret_stack = NULL; |
| 2714 | } |
| 2715 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 2716 | void ftrace_graph_exit_task(struct task_struct *t) |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2717 | { |
Frederic Weisbecker | eae849c | 2008-11-23 17:33:12 +0100 | [diff] [blame] | 2718 | struct ftrace_ret_stack *ret_stack = t->ret_stack; |
| 2719 | |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2720 | t->ret_stack = NULL; |
Frederic Weisbecker | eae849c | 2008-11-23 17:33:12 +0100 | [diff] [blame] | 2721 | /* NULL must become visible to IRQs before we free it: */ |
| 2722 | barrier(); |
| 2723 | |
| 2724 | kfree(ret_stack); |
Frederic Weisbecker | f201ae2 | 2008-11-23 06:22:56 +0100 | [diff] [blame] | 2725 | } |
Steven Rostedt | 14a866c | 2008-12-02 23:50:02 -0500 | [diff] [blame] | 2726 | |
| 2727 | void ftrace_graph_stop(void) |
| 2728 | { |
| 2729 | ftrace_stop(); |
| 2730 | } |
Frederic Weisbecker | 15e6cb3 | 2008-11-11 07:14:25 +0100 | [diff] [blame] | 2731 | #endif |
| 2732 | |