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Commit | Line | Data |
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1b29b018 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Based on code from the latency_tracer, that is: | |
8 | * | |
9 | * Copyright (C) 2004-2006 Ingo Molnar | |
6d49e352 | 10 | * Copyright (C) 2004 Nadia Yvette Chambers |
1b29b018 | 11 | */ |
23b4ff3a | 12 | #include <linux/ring_buffer.h> |
1b29b018 SR |
13 | #include <linux/debugfs.h> |
14 | #include <linux/uaccess.h> | |
15 | #include <linux/ftrace.h> | |
f20a5806 | 16 | #include <linux/slab.h> |
2e0f5761 | 17 | #include <linux/fs.h> |
1b29b018 SR |
18 | |
19 | #include "trace.h" | |
20 | ||
f20a5806 SRRH |
21 | static void tracing_start_function_trace(struct trace_array *tr); |
22 | static void tracing_stop_function_trace(struct trace_array *tr); | |
23 | static void | |
24 | function_trace_call(unsigned long ip, unsigned long parent_ip, | |
25 | struct ftrace_ops *op, struct pt_regs *pt_regs); | |
26 | static void | |
27 | function_stack_trace_call(unsigned long ip, unsigned long parent_ip, | |
28 | struct ftrace_ops *op, struct pt_regs *pt_regs); | |
f20a5806 SRRH |
29 | static struct tracer_flags func_flags; |
30 | ||
31 | /* Our option */ | |
32 | enum { | |
33 | TRACE_FUNC_OPT_STACK = 0x1, | |
34 | }; | |
35 | ||
36 | static int allocate_ftrace_ops(struct trace_array *tr) | |
37 | { | |
38 | struct ftrace_ops *ops; | |
a225cdd2 | 39 | |
f20a5806 SRRH |
40 | ops = kzalloc(sizeof(*ops), GFP_KERNEL); |
41 | if (!ops) | |
42 | return -ENOMEM; | |
53614991 | 43 | |
f20a5806 SRRH |
44 | /* Currently only the non stack verision is supported */ |
45 | ops->func = function_trace_call; | |
345ddcc8 | 46 | ops->flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_PID; |
f20a5806 SRRH |
47 | |
48 | tr->ops = ops; | |
49 | ops->private = tr; | |
50 | return 0; | |
51 | } | |
a225cdd2 | 52 | |
591dffda SRRH |
53 | |
54 | int ftrace_create_function_files(struct trace_array *tr, | |
55 | struct dentry *parent) | |
56 | { | |
57 | int ret; | |
58 | ||
5d6c97c5 SRRH |
59 | /* |
60 | * The top level array uses the "global_ops", and the files are | |
61 | * created on boot up. | |
62 | */ | |
63 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
64 | return 0; | |
65 | ||
66 | ret = allocate_ftrace_ops(tr); | |
67 | if (ret) | |
68 | return ret; | |
591dffda SRRH |
69 | |
70 | ftrace_create_filter_files(tr->ops, parent); | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | void ftrace_destroy_function_files(struct trace_array *tr) | |
76 | { | |
77 | ftrace_destroy_filter_files(tr->ops); | |
78 | kfree(tr->ops); | |
79 | tr->ops = NULL; | |
80 | } | |
81 | ||
b6f11df2 | 82 | static int function_trace_init(struct trace_array *tr) |
1b29b018 | 83 | { |
4104d326 | 84 | ftrace_func_t func; |
f20a5806 | 85 | |
4104d326 SRRH |
86 | /* |
87 | * Instance trace_arrays get their ops allocated | |
88 | * at instance creation. Unless it failed | |
89 | * the allocation. | |
90 | */ | |
91 | if (!tr->ops) | |
591dffda | 92 | return -ENOMEM; |
4104d326 SRRH |
93 | |
94 | /* Currently only the global instance can do stack tracing */ | |
95 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL && | |
96 | func_flags.val & TRACE_FUNC_OPT_STACK) | |
97 | func = function_stack_trace_call; | |
98 | else | |
99 | func = function_trace_call; | |
100 | ||
101 | ftrace_init_array_ops(tr, func); | |
f20a5806 | 102 | |
12883efb | 103 | tr->trace_buffer.cpu = get_cpu(); |
26bc83f4 SR |
104 | put_cpu(); |
105 | ||
41bc8144 | 106 | tracing_start_cmdline_record(); |
f20a5806 | 107 | tracing_start_function_trace(tr); |
1c80025a | 108 | return 0; |
1b29b018 SR |
109 | } |
110 | ||
e309b41d | 111 | static void function_trace_reset(struct trace_array *tr) |
1b29b018 | 112 | { |
f20a5806 | 113 | tracing_stop_function_trace(tr); |
b6f11df2 | 114 | tracing_stop_cmdline_record(); |
4104d326 | 115 | ftrace_reset_array_ops(tr); |
1b29b018 SR |
116 | } |
117 | ||
9036990d SR |
118 | static void function_trace_start(struct trace_array *tr) |
119 | { | |
12883efb | 120 | tracing_reset_online_cpus(&tr->trace_buffer); |
9036990d SR |
121 | } |
122 | ||
bb3c3c95 | 123 | static void |
2f5f6ad9 | 124 | function_trace_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 125 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
bb3c3c95 | 126 | { |
f20a5806 | 127 | struct trace_array *tr = op->private; |
bb3c3c95 SR |
128 | struct trace_array_cpu *data; |
129 | unsigned long flags; | |
d41032a8 | 130 | int bit; |
bb3c3c95 SR |
131 | int cpu; |
132 | int pc; | |
133 | ||
f20a5806 | 134 | if (unlikely(!tr->function_enabled)) |
bb3c3c95 SR |
135 | return; |
136 | ||
897f68a4 SR |
137 | pc = preempt_count(); |
138 | preempt_disable_notrace(); | |
bb3c3c95 | 139 | |
897f68a4 SR |
140 | bit = trace_test_and_set_recursion(TRACE_FTRACE_START, TRACE_FTRACE_MAX); |
141 | if (bit < 0) | |
142 | goto out; | |
143 | ||
144 | cpu = smp_processor_id(); | |
12883efb | 145 | data = per_cpu_ptr(tr->trace_buffer.data, cpu); |
897f68a4 SR |
146 | if (!atomic_read(&data->disabled)) { |
147 | local_save_flags(flags); | |
7be42151 | 148 | trace_function(tr, ip, parent_ip, flags, pc); |
bb3c3c95 | 149 | } |
897f68a4 | 150 | trace_clear_recursion(bit); |
bb3c3c95 | 151 | |
897f68a4 SR |
152 | out: |
153 | preempt_enable_notrace(); | |
bb3c3c95 SR |
154 | } |
155 | ||
53614991 | 156 | static void |
2f5f6ad9 | 157 | function_stack_trace_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 158 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
53614991 | 159 | { |
f20a5806 | 160 | struct trace_array *tr = op->private; |
53614991 SR |
161 | struct trace_array_cpu *data; |
162 | unsigned long flags; | |
163 | long disabled; | |
164 | int cpu; | |
165 | int pc; | |
166 | ||
f20a5806 | 167 | if (unlikely(!tr->function_enabled)) |
53614991 SR |
168 | return; |
169 | ||
170 | /* | |
171 | * Need to use raw, since this must be called before the | |
172 | * recursive protection is performed. | |
173 | */ | |
174 | local_irq_save(flags); | |
175 | cpu = raw_smp_processor_id(); | |
12883efb | 176 | data = per_cpu_ptr(tr->trace_buffer.data, cpu); |
53614991 SR |
177 | disabled = atomic_inc_return(&data->disabled); |
178 | ||
179 | if (likely(disabled == 1)) { | |
180 | pc = preempt_count(); | |
7be42151 | 181 | trace_function(tr, ip, parent_ip, flags, pc); |
53614991 SR |
182 | /* |
183 | * skip over 5 funcs: | |
184 | * __ftrace_trace_stack, | |
185 | * __trace_stack, | |
186 | * function_stack_trace_call | |
187 | * ftrace_list_func | |
188 | * ftrace_call | |
189 | */ | |
7be42151 | 190 | __trace_stack(tr, flags, 5, pc); |
53614991 SR |
191 | } |
192 | ||
193 | atomic_dec(&data->disabled); | |
194 | local_irq_restore(flags); | |
195 | } | |
196 | ||
53614991 SR |
197 | static struct tracer_opt func_opts[] = { |
198 | #ifdef CONFIG_STACKTRACE | |
199 | { TRACER_OPT(func_stack_trace, TRACE_FUNC_OPT_STACK) }, | |
200 | #endif | |
201 | { } /* Always set a last empty entry */ | |
202 | }; | |
203 | ||
204 | static struct tracer_flags func_flags = { | |
205 | .val = 0, /* By default: all flags disabled */ | |
206 | .opts = func_opts | |
207 | }; | |
208 | ||
f20a5806 | 209 | static void tracing_start_function_trace(struct trace_array *tr) |
3eb36aa0 | 210 | { |
f20a5806 SRRH |
211 | tr->function_enabled = 0; |
212 | register_ftrace_function(tr->ops); | |
213 | tr->function_enabled = 1; | |
3eb36aa0 SR |
214 | } |
215 | ||
f20a5806 | 216 | static void tracing_stop_function_trace(struct trace_array *tr) |
3eb36aa0 | 217 | { |
f20a5806 SRRH |
218 | tr->function_enabled = 0; |
219 | unregister_ftrace_function(tr->ops); | |
3eb36aa0 SR |
220 | } |
221 | ||
d39cdd20 CH |
222 | static struct tracer function_trace; |
223 | ||
8c1a49ae SRRH |
224 | static int |
225 | func_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) | |
53614991 | 226 | { |
f555f123 AV |
227 | switch (bit) { |
228 | case TRACE_FUNC_OPT_STACK: | |
53614991 SR |
229 | /* do nothing if already set */ |
230 | if (!!set == !!(func_flags.val & TRACE_FUNC_OPT_STACK)) | |
f555f123 | 231 | break; |
53614991 | 232 | |
d39cdd20 CH |
233 | /* We can change this flag when not running. */ |
234 | if (tr->current_trace != &function_trace) | |
235 | break; | |
236 | ||
f20a5806 SRRH |
237 | unregister_ftrace_function(tr->ops); |
238 | ||
3eb36aa0 | 239 | if (set) { |
4104d326 | 240 | tr->ops->func = function_stack_trace_call; |
f20a5806 | 241 | register_ftrace_function(tr->ops); |
3eb36aa0 | 242 | } else { |
4104d326 | 243 | tr->ops->func = function_trace_call; |
f20a5806 | 244 | register_ftrace_function(tr->ops); |
3eb36aa0 | 245 | } |
53614991 | 246 | |
f555f123 AV |
247 | break; |
248 | default: | |
249 | return -EINVAL; | |
53614991 SR |
250 | } |
251 | ||
f555f123 | 252 | return 0; |
53614991 SR |
253 | } |
254 | ||
8f768993 | 255 | static struct tracer function_trace __tracer_data = |
1b29b018 | 256 | { |
3eb36aa0 SR |
257 | .name = "function", |
258 | .init = function_trace_init, | |
259 | .reset = function_trace_reset, | |
260 | .start = function_trace_start, | |
53614991 SR |
261 | .flags = &func_flags, |
262 | .set_flag = func_set_flag, | |
f20a5806 | 263 | .allow_instances = true, |
60a11774 | 264 | #ifdef CONFIG_FTRACE_SELFTEST |
3eb36aa0 | 265 | .selftest = trace_selftest_startup_function, |
60a11774 | 266 | #endif |
1b29b018 SR |
267 | }; |
268 | ||
23b4ff3a | 269 | #ifdef CONFIG_DYNAMIC_FTRACE |
fe014e24 | 270 | static void update_traceon_count(struct ftrace_probe_ops *ops, |
2290f2c5 SRV |
271 | unsigned long ip, |
272 | struct trace_array *tr, bool on, | |
6e444319 | 273 | void *data) |
23b4ff3a | 274 | { |
6e444319 | 275 | struct ftrace_func_mapper *mapper = data; |
fe014e24 SRV |
276 | long *count; |
277 | long old_count; | |
23b4ff3a | 278 | |
a9ce7c36 SRRH |
279 | /* |
280 | * Tracing gets disabled (or enabled) once per count. | |
0af26492 | 281 | * This function can be called at the same time on multiple CPUs. |
a9ce7c36 SRRH |
282 | * It is fine if both disable (or enable) tracing, as disabling |
283 | * (or enabling) the second time doesn't do anything as the | |
284 | * state of the tracer is already disabled (or enabled). | |
285 | * What needs to be synchronized in this case is that the count | |
286 | * only gets decremented once, even if the tracer is disabled | |
287 | * (or enabled) twice, as the second one is really a nop. | |
288 | * | |
289 | * The memory barriers guarantee that we only decrement the | |
290 | * counter once. First the count is read to a local variable | |
291 | * and a read barrier is used to make sure that it is loaded | |
292 | * before checking if the tracer is in the state we want. | |
293 | * If the tracer is not in the state we want, then the count | |
294 | * is guaranteed to be the old count. | |
295 | * | |
296 | * Next the tracer is set to the state we want (disabled or enabled) | |
297 | * then a write memory barrier is used to make sure that | |
298 | * the new state is visible before changing the counter by | |
299 | * one minus the old counter. This guarantees that another CPU | |
300 | * executing this code will see the new state before seeing | |
0af26492 | 301 | * the new counter value, and would not do anything if the new |
a9ce7c36 SRRH |
302 | * counter is seen. |
303 | * | |
304 | * Note, there is no synchronization between this and a user | |
305 | * setting the tracing_on file. But we currently don't care | |
306 | * about that. | |
307 | */ | |
fe014e24 SRV |
308 | count = (long *)ftrace_func_mapper_find_ip(mapper, ip); |
309 | old_count = *count; | |
310 | ||
311 | if (old_count <= 0) | |
a9ce7c36 | 312 | return; |
23b4ff3a | 313 | |
a9ce7c36 SRRH |
314 | /* Make sure we see count before checking tracing state */ |
315 | smp_rmb(); | |
23b4ff3a | 316 | |
2290f2c5 | 317 | if (on == !!tracer_tracing_is_on(tr)) |
a9ce7c36 SRRH |
318 | return; |
319 | ||
320 | if (on) | |
2290f2c5 | 321 | tracer_tracing_on(tr); |
a9ce7c36 | 322 | else |
2290f2c5 | 323 | tracer_tracing_off(tr); |
a9ce7c36 | 324 | |
a9ce7c36 SRRH |
325 | /* Make sure tracing state is visible before updating count */ |
326 | smp_wmb(); | |
327 | ||
328 | *count = old_count - 1; | |
23b4ff3a SR |
329 | } |
330 | ||
331 | static void | |
bca6c8d0 | 332 | ftrace_traceon_count(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 333 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 334 | void *data) |
23b4ff3a | 335 | { |
2290f2c5 | 336 | update_traceon_count(ops, ip, tr, 1, data); |
1c317143 | 337 | } |
23b4ff3a | 338 | |
1c317143 | 339 | static void |
bca6c8d0 | 340 | ftrace_traceoff_count(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 341 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 342 | void *data) |
1c317143 | 343 | { |
2290f2c5 | 344 | update_traceon_count(ops, ip, tr, 0, data); |
23b4ff3a SR |
345 | } |
346 | ||
8380d248 | 347 | static void |
bca6c8d0 | 348 | ftrace_traceon(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 349 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 350 | void *data) |
8380d248 | 351 | { |
2290f2c5 | 352 | if (tracer_tracing_is_on(tr)) |
8380d248 SRRH |
353 | return; |
354 | ||
2290f2c5 | 355 | tracer_tracing_on(tr); |
8380d248 SRRH |
356 | } |
357 | ||
358 | static void | |
bca6c8d0 | 359 | ftrace_traceoff(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 360 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 361 | void *data) |
8380d248 | 362 | { |
2290f2c5 | 363 | if (!tracer_tracing_is_on(tr)) |
8380d248 SRRH |
364 | return; |
365 | ||
2290f2c5 | 366 | tracer_tracing_off(tr); |
8380d248 SRRH |
367 | } |
368 | ||
dd42cd3e SRRH |
369 | /* |
370 | * Skip 4: | |
371 | * ftrace_stacktrace() | |
372 | * function_trace_probe_call() | |
373 | * ftrace_ops_list_func() | |
374 | * ftrace_call() | |
375 | */ | |
376 | #define STACK_SKIP 4 | |
377 | ||
dcc19d28 SRV |
378 | static __always_inline void trace_stack(struct trace_array *tr) |
379 | { | |
380 | unsigned long flags; | |
381 | int pc; | |
382 | ||
383 | local_save_flags(flags); | |
384 | pc = preempt_count(); | |
385 | ||
386 | __trace_stack(tr, flags, STACK_SKIP, pc); | |
387 | } | |
388 | ||
dd42cd3e | 389 | static void |
bca6c8d0 | 390 | ftrace_stacktrace(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 391 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 392 | void *data) |
dd42cd3e | 393 | { |
dcc19d28 | 394 | trace_stack(tr); |
dd42cd3e SRRH |
395 | } |
396 | ||
397 | static void | |
bca6c8d0 | 398 | ftrace_stacktrace_count(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 399 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 400 | void *data) |
dd42cd3e | 401 | { |
6e444319 | 402 | struct ftrace_func_mapper *mapper = data; |
fe014e24 | 403 | long *count; |
a9ce7c36 SRRH |
404 | long old_count; |
405 | long new_count; | |
406 | ||
fe014e24 SRV |
407 | if (!tracing_is_on()) |
408 | return; | |
409 | ||
410 | /* unlimited? */ | |
411 | if (!mapper) { | |
dcc19d28 | 412 | trace_stack(tr); |
fe014e24 SRV |
413 | return; |
414 | } | |
415 | ||
416 | count = (long *)ftrace_func_mapper_find_ip(mapper, ip); | |
417 | ||
a9ce7c36 SRRH |
418 | /* |
419 | * Stack traces should only execute the number of times the | |
420 | * user specified in the counter. | |
421 | */ | |
422 | do { | |
a9ce7c36 SRRH |
423 | old_count = *count; |
424 | ||
425 | if (!old_count) | |
426 | return; | |
427 | ||
a9ce7c36 SRRH |
428 | new_count = old_count - 1; |
429 | new_count = cmpxchg(count, old_count, new_count); | |
430 | if (new_count == old_count) | |
dcc19d28 | 431 | trace_stack(tr); |
a9ce7c36 | 432 | |
fe014e24 SRV |
433 | if (!tracing_is_on()) |
434 | return; | |
435 | ||
a9ce7c36 SRRH |
436 | } while (new_count != old_count); |
437 | } | |
438 | ||
6e444319 SRV |
439 | static int update_count(struct ftrace_probe_ops *ops, unsigned long ip, |
440 | void *data) | |
a9ce7c36 | 441 | { |
6e444319 | 442 | struct ftrace_func_mapper *mapper = data; |
fe014e24 | 443 | long *count = NULL; |
a9ce7c36 | 444 | |
fe014e24 SRV |
445 | if (mapper) |
446 | count = (long *)ftrace_func_mapper_find_ip(mapper, ip); | |
a9ce7c36 | 447 | |
fe014e24 SRV |
448 | if (count) { |
449 | if (*count <= 0) | |
450 | return 0; | |
a9ce7c36 | 451 | (*count)--; |
fe014e24 | 452 | } |
a9ce7c36 SRRH |
453 | |
454 | return 1; | |
dd42cd3e SRRH |
455 | } |
456 | ||
ad71d889 | 457 | static void |
bca6c8d0 | 458 | ftrace_dump_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 459 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 460 | void *data) |
ad71d889 | 461 | { |
6e444319 | 462 | if (update_count(ops, ip, data)) |
ad71d889 SRRH |
463 | ftrace_dump(DUMP_ALL); |
464 | } | |
465 | ||
90e3c03c SRRH |
466 | /* Only dump the current CPU buffer. */ |
467 | static void | |
bca6c8d0 | 468 | ftrace_cpudump_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 469 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 470 | void *data) |
90e3c03c | 471 | { |
6e444319 | 472 | if (update_count(ops, ip, data)) |
90e3c03c SRRH |
473 | ftrace_dump(DUMP_ORIG); |
474 | } | |
475 | ||
e110e3d1 | 476 | static int |
dd42cd3e | 477 | ftrace_probe_print(const char *name, struct seq_file *m, |
6e444319 SRV |
478 | unsigned long ip, struct ftrace_probe_ops *ops, |
479 | void *data) | |
dd42cd3e | 480 | { |
6e444319 | 481 | struct ftrace_func_mapper *mapper = data; |
fe014e24 | 482 | long *count = NULL; |
dd42cd3e SRRH |
483 | |
484 | seq_printf(m, "%ps:%s", (void *)ip, name); | |
485 | ||
fe014e24 SRV |
486 | if (mapper) |
487 | count = (long *)ftrace_func_mapper_find_ip(mapper, ip); | |
488 | ||
489 | if (count) | |
490 | seq_printf(m, ":count=%ld\n", *count); | |
dd42cd3e | 491 | else |
fe014e24 | 492 | seq_puts(m, ":unlimited\n"); |
dd42cd3e SRRH |
493 | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static int | |
498 | ftrace_traceon_print(struct seq_file *m, unsigned long ip, | |
b5f081b5 SRV |
499 | struct ftrace_probe_ops *ops, |
500 | void *data) | |
dd42cd3e | 501 | { |
6e444319 | 502 | return ftrace_probe_print("traceon", m, ip, ops, data); |
dd42cd3e SRRH |
503 | } |
504 | ||
505 | static int | |
506 | ftrace_traceoff_print(struct seq_file *m, unsigned long ip, | |
507 | struct ftrace_probe_ops *ops, void *data) | |
508 | { | |
6e444319 | 509 | return ftrace_probe_print("traceoff", m, ip, ops, data); |
dd42cd3e SRRH |
510 | } |
511 | ||
512 | static int | |
513 | ftrace_stacktrace_print(struct seq_file *m, unsigned long ip, | |
514 | struct ftrace_probe_ops *ops, void *data) | |
515 | { | |
6e444319 | 516 | return ftrace_probe_print("stacktrace", m, ip, ops, data); |
dd42cd3e | 517 | } |
e110e3d1 | 518 | |
ad71d889 SRRH |
519 | static int |
520 | ftrace_dump_print(struct seq_file *m, unsigned long ip, | |
521 | struct ftrace_probe_ops *ops, void *data) | |
522 | { | |
6e444319 | 523 | return ftrace_probe_print("dump", m, ip, ops, data); |
ad71d889 SRRH |
524 | } |
525 | ||
90e3c03c SRRH |
526 | static int |
527 | ftrace_cpudump_print(struct seq_file *m, unsigned long ip, | |
528 | struct ftrace_probe_ops *ops, void *data) | |
529 | { | |
6e444319 | 530 | return ftrace_probe_print("cpudump", m, ip, ops, data); |
fe014e24 SRV |
531 | } |
532 | ||
533 | ||
534 | static int | |
b5f081b5 | 535 | ftrace_count_init(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 536 | unsigned long ip, void *init_data, void **data) |
fe014e24 | 537 | { |
6e444319 SRV |
538 | struct ftrace_func_mapper *mapper = *data; |
539 | ||
540 | if (!mapper) { | |
541 | mapper = allocate_ftrace_func_mapper(); | |
542 | if (!mapper) | |
543 | return -ENOMEM; | |
544 | *data = mapper; | |
545 | } | |
fe014e24 | 546 | |
6e444319 | 547 | return ftrace_func_mapper_add_ip(mapper, ip, init_data); |
fe014e24 SRV |
548 | } |
549 | ||
550 | static void | |
b5f081b5 | 551 | ftrace_count_free(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 552 | unsigned long ip, void *data) |
fe014e24 | 553 | { |
6e444319 SRV |
554 | struct ftrace_func_mapper *mapper = data; |
555 | ||
556 | if (!ip) { | |
557 | free_ftrace_func_mapper(mapper, NULL); | |
558 | return; | |
559 | } | |
fe014e24 SRV |
560 | |
561 | ftrace_func_mapper_remove_ip(mapper, ip); | |
90e3c03c SRRH |
562 | } |
563 | ||
8380d248 SRRH |
564 | static struct ftrace_probe_ops traceon_count_probe_ops = { |
565 | .func = ftrace_traceon_count, | |
dd42cd3e | 566 | .print = ftrace_traceon_print, |
fe014e24 SRV |
567 | .init = ftrace_count_init, |
568 | .free = ftrace_count_free, | |
8380d248 SRRH |
569 | }; |
570 | ||
571 | static struct ftrace_probe_ops traceoff_count_probe_ops = { | |
572 | .func = ftrace_traceoff_count, | |
dd42cd3e | 573 | .print = ftrace_traceoff_print, |
fe014e24 SRV |
574 | .init = ftrace_count_init, |
575 | .free = ftrace_count_free, | |
dd42cd3e SRRH |
576 | }; |
577 | ||
578 | static struct ftrace_probe_ops stacktrace_count_probe_ops = { | |
579 | .func = ftrace_stacktrace_count, | |
580 | .print = ftrace_stacktrace_print, | |
fe014e24 SRV |
581 | .init = ftrace_count_init, |
582 | .free = ftrace_count_free, | |
8380d248 SRRH |
583 | }; |
584 | ||
ad71d889 SRRH |
585 | static struct ftrace_probe_ops dump_probe_ops = { |
586 | .func = ftrace_dump_probe, | |
587 | .print = ftrace_dump_print, | |
fe014e24 SRV |
588 | .init = ftrace_count_init, |
589 | .free = ftrace_count_free, | |
ad71d889 SRRH |
590 | }; |
591 | ||
90e3c03c SRRH |
592 | static struct ftrace_probe_ops cpudump_probe_ops = { |
593 | .func = ftrace_cpudump_probe, | |
594 | .print = ftrace_cpudump_print, | |
595 | }; | |
596 | ||
b6887d79 | 597 | static struct ftrace_probe_ops traceon_probe_ops = { |
23b4ff3a | 598 | .func = ftrace_traceon, |
dd42cd3e | 599 | .print = ftrace_traceon_print, |
23b4ff3a SR |
600 | }; |
601 | ||
b6887d79 | 602 | static struct ftrace_probe_ops traceoff_probe_ops = { |
23b4ff3a | 603 | .func = ftrace_traceoff, |
dd42cd3e | 604 | .print = ftrace_traceoff_print, |
23b4ff3a SR |
605 | }; |
606 | ||
dd42cd3e SRRH |
607 | static struct ftrace_probe_ops stacktrace_probe_ops = { |
608 | .func = ftrace_stacktrace, | |
609 | .print = ftrace_stacktrace_print, | |
610 | }; | |
e110e3d1 | 611 | |
23b4ff3a | 612 | static int |
04ec7bb6 SRV |
613 | ftrace_trace_probe_callback(struct trace_array *tr, |
614 | struct ftrace_probe_ops *ops, | |
dd42cd3e SRRH |
615 | struct ftrace_hash *hash, char *glob, |
616 | char *cmd, char *param, int enable) | |
23b4ff3a | 617 | { |
23b4ff3a SR |
618 | void *count = (void *)-1; |
619 | char *number; | |
620 | int ret; | |
621 | ||
622 | /* hash funcs only work with set_ftrace_filter */ | |
623 | if (!enable) | |
624 | return -EINVAL; | |
625 | ||
d3d532d7 | 626 | if (glob[0] == '!') |
7b60f3d8 | 627 | return unregister_ftrace_function_probe_func(glob+1, tr, ops); |
8b8fa62c | 628 | |
23b4ff3a SR |
629 | if (!param) |
630 | goto out_reg; | |
631 | ||
632 | number = strsep(¶m, ":"); | |
633 | ||
634 | if (!strlen(number)) | |
635 | goto out_reg; | |
636 | ||
637 | /* | |
638 | * We use the callback data field (which is a pointer) | |
639 | * as our counter. | |
640 | */ | |
bcd83ea6 | 641 | ret = kstrtoul(number, 0, (unsigned long *)&count); |
23b4ff3a SR |
642 | if (ret) |
643 | return ret; | |
644 | ||
645 | out_reg: | |
04ec7bb6 | 646 | ret = register_ftrace_function_probe(glob, tr, ops, count); |
23b4ff3a | 647 | |
04aef32d | 648 | return ret < 0 ? ret : 0; |
23b4ff3a SR |
649 | } |
650 | ||
dd42cd3e | 651 | static int |
04ec7bb6 | 652 | ftrace_trace_onoff_callback(struct trace_array *tr, struct ftrace_hash *hash, |
dd42cd3e SRRH |
653 | char *glob, char *cmd, char *param, int enable) |
654 | { | |
655 | struct ftrace_probe_ops *ops; | |
656 | ||
657 | /* we register both traceon and traceoff to this callback */ | |
658 | if (strcmp(cmd, "traceon") == 0) | |
659 | ops = param ? &traceon_count_probe_ops : &traceon_probe_ops; | |
660 | else | |
661 | ops = param ? &traceoff_count_probe_ops : &traceoff_probe_ops; | |
662 | ||
04ec7bb6 | 663 | return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd, |
dd42cd3e SRRH |
664 | param, enable); |
665 | } | |
666 | ||
667 | static int | |
04ec7bb6 | 668 | ftrace_stacktrace_callback(struct trace_array *tr, struct ftrace_hash *hash, |
dd42cd3e SRRH |
669 | char *glob, char *cmd, char *param, int enable) |
670 | { | |
671 | struct ftrace_probe_ops *ops; | |
672 | ||
673 | ops = param ? &stacktrace_count_probe_ops : &stacktrace_probe_ops; | |
674 | ||
04ec7bb6 | 675 | return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd, |
dd42cd3e SRRH |
676 | param, enable); |
677 | } | |
678 | ||
ad71d889 | 679 | static int |
04ec7bb6 | 680 | ftrace_dump_callback(struct trace_array *tr, struct ftrace_hash *hash, |
ad71d889 SRRH |
681 | char *glob, char *cmd, char *param, int enable) |
682 | { | |
683 | struct ftrace_probe_ops *ops; | |
684 | ||
685 | ops = &dump_probe_ops; | |
686 | ||
687 | /* Only dump once. */ | |
04ec7bb6 | 688 | return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd, |
ad71d889 SRRH |
689 | "1", enable); |
690 | } | |
691 | ||
90e3c03c | 692 | static int |
04ec7bb6 | 693 | ftrace_cpudump_callback(struct trace_array *tr, struct ftrace_hash *hash, |
90e3c03c SRRH |
694 | char *glob, char *cmd, char *param, int enable) |
695 | { | |
696 | struct ftrace_probe_ops *ops; | |
697 | ||
698 | ops = &cpudump_probe_ops; | |
699 | ||
700 | /* Only dump once. */ | |
04ec7bb6 | 701 | return ftrace_trace_probe_callback(tr, ops, hash, glob, cmd, |
90e3c03c SRRH |
702 | "1", enable); |
703 | } | |
704 | ||
23b4ff3a SR |
705 | static struct ftrace_func_command ftrace_traceon_cmd = { |
706 | .name = "traceon", | |
707 | .func = ftrace_trace_onoff_callback, | |
708 | }; | |
709 | ||
710 | static struct ftrace_func_command ftrace_traceoff_cmd = { | |
711 | .name = "traceoff", | |
712 | .func = ftrace_trace_onoff_callback, | |
713 | }; | |
714 | ||
dd42cd3e SRRH |
715 | static struct ftrace_func_command ftrace_stacktrace_cmd = { |
716 | .name = "stacktrace", | |
717 | .func = ftrace_stacktrace_callback, | |
718 | }; | |
719 | ||
ad71d889 SRRH |
720 | static struct ftrace_func_command ftrace_dump_cmd = { |
721 | .name = "dump", | |
722 | .func = ftrace_dump_callback, | |
723 | }; | |
724 | ||
90e3c03c SRRH |
725 | static struct ftrace_func_command ftrace_cpudump_cmd = { |
726 | .name = "cpudump", | |
727 | .func = ftrace_cpudump_callback, | |
728 | }; | |
729 | ||
23b4ff3a SR |
730 | static int __init init_func_cmd_traceon(void) |
731 | { | |
732 | int ret; | |
733 | ||
734 | ret = register_ftrace_command(&ftrace_traceoff_cmd); | |
735 | if (ret) | |
736 | return ret; | |
737 | ||
738 | ret = register_ftrace_command(&ftrace_traceon_cmd); | |
739 | if (ret) | |
ad71d889 | 740 | goto out_free_traceoff; |
dd42cd3e SRRH |
741 | |
742 | ret = register_ftrace_command(&ftrace_stacktrace_cmd); | |
ad71d889 SRRH |
743 | if (ret) |
744 | goto out_free_traceon; | |
745 | ||
746 | ret = register_ftrace_command(&ftrace_dump_cmd); | |
747 | if (ret) | |
748 | goto out_free_stacktrace; | |
749 | ||
90e3c03c SRRH |
750 | ret = register_ftrace_command(&ftrace_cpudump_cmd); |
751 | if (ret) | |
752 | goto out_free_dump; | |
753 | ||
ad71d889 SRRH |
754 | return 0; |
755 | ||
90e3c03c SRRH |
756 | out_free_dump: |
757 | unregister_ftrace_command(&ftrace_dump_cmd); | |
ad71d889 SRRH |
758 | out_free_stacktrace: |
759 | unregister_ftrace_command(&ftrace_stacktrace_cmd); | |
760 | out_free_traceon: | |
761 | unregister_ftrace_command(&ftrace_traceon_cmd); | |
762 | out_free_traceoff: | |
763 | unregister_ftrace_command(&ftrace_traceoff_cmd); | |
764 | ||
23b4ff3a SR |
765 | return ret; |
766 | } | |
767 | #else | |
768 | static inline int init_func_cmd_traceon(void) | |
769 | { | |
770 | return 0; | |
771 | } | |
772 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
773 | ||
dbeafd0d | 774 | __init int init_function_trace(void) |
1b29b018 | 775 | { |
23b4ff3a | 776 | init_func_cmd_traceon(); |
1b29b018 SR |
777 | return register_tracer(&function_trace); |
778 | } |