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Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001/*
2 *
3 * Function graph tracer.
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08004 * Copyright (c) 2008-2009 Frederic Weisbecker <fweisbec@gmail.com>
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01005 * Mostly borrowed from function tracer which
6 * is Copyright (c) Steven Rostedt <srostedt@redhat.com>
7 *
8 */
9#include <linux/debugfs.h>
10#include <linux/uaccess.h>
11#include <linux/ftrace.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010013#include <linux/fs.h>
14
15#include "trace.h"
Steven Rostedtf0868d12008-12-23 23:24:12 -050016#include "trace_output.h"
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010017
Jiri Olsabe1eca32009-11-24 13:57:38 +010018struct fgraph_cpu_data {
Steven Rostedt2fbcdb32009-03-19 13:24:42 -040019 pid_t last_pid;
20 int depth;
Jiri Olsabe1eca32009-11-24 13:57:38 +010021 int ignore;
Steven Rostedtf1c7f512010-02-26 17:08:16 -050022 unsigned long enter_funcs[FTRACE_RETFUNC_DEPTH];
Jiri Olsabe1eca32009-11-24 13:57:38 +010023};
24
25struct fgraph_data {
26 struct fgraph_cpu_data *cpu_data;
27
28 /* Place to preserve last processed entry. */
29 struct ftrace_graph_ent_entry ent;
30 struct ftrace_graph_ret_entry ret;
31 int failed;
32 int cpu;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -040033};
34
Frederic Weisbecker287b6e62008-11-26 00:57:25 +010035#define TRACE_GRAPH_INDENT 2
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010036
Frederic Weisbecker1a056152008-11-28 00:42:46 +010037/* Flag options */
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010038#define TRACE_GRAPH_PRINT_OVERRUN 0x1
Frederic Weisbecker1a056152008-11-28 00:42:46 +010039#define TRACE_GRAPH_PRINT_CPU 0x2
40#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +010041#define TRACE_GRAPH_PRINT_PROC 0x8
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -080042#define TRACE_GRAPH_PRINT_DURATION 0x10
Jiri Olsa9106b692010-04-02 19:01:20 +020043#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
Frederic Weisbecker1a056152008-11-28 00:42:46 +010044
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010045static struct tracer_opt trace_opts[] = {
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -080046 /* Display overruns? (for self-debug purpose) */
Frederic Weisbecker1a056152008-11-28 00:42:46 +010047 { TRACER_OPT(funcgraph-overrun, TRACE_GRAPH_PRINT_OVERRUN) },
48 /* Display CPU ? */
49 { TRACER_OPT(funcgraph-cpu, TRACE_GRAPH_PRINT_CPU) },
50 /* Display Overhead ? */
51 { TRACER_OPT(funcgraph-overhead, TRACE_GRAPH_PRINT_OVERHEAD) },
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +010052 /* Display proc name/pid */
53 { TRACER_OPT(funcgraph-proc, TRACE_GRAPH_PRINT_PROC) },
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -080054 /* Display duration of execution */
55 { TRACER_OPT(funcgraph-duration, TRACE_GRAPH_PRINT_DURATION) },
56 /* Display absolute time of an entry */
57 { TRACER_OPT(funcgraph-abstime, TRACE_GRAPH_PRINT_ABS_TIME) },
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010058 { } /* Empty entry */
59};
60
61static struct tracer_flags tracer_flags = {
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +010062 /* Don't display overruns and proc by default */
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -080063 .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD |
64 TRACE_GRAPH_PRINT_DURATION,
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010065 .opts = trace_opts
66};
67
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +020068static struct trace_array *graph_array;
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -080069
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010070
Steven Rostedt712406a2009-02-09 10:54:03 -080071/* Add a function return address to the trace stack on thread info.*/
72int
Steven Rostedt71e308a2009-06-18 12:45:08 -040073ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
74 unsigned long frame_pointer)
Steven Rostedt712406a2009-02-09 10:54:03 -080075{
Steven Rostedt5d1a03d2009-03-23 23:38:49 -040076 unsigned long long calltime;
Steven Rostedt712406a2009-02-09 10:54:03 -080077 int index;
78
79 if (!current->ret_stack)
80 return -EBUSY;
81
Steven Rostedt82310a32009-06-02 12:26:07 -040082 /*
83 * We must make sure the ret_stack is tested before we read
84 * anything else.
85 */
86 smp_rmb();
87
Steven Rostedt712406a2009-02-09 10:54:03 -080088 /* The return trace stack is full */
89 if (current->curr_ret_stack == FTRACE_RETFUNC_DEPTH - 1) {
90 atomic_inc(&current->trace_overrun);
91 return -EBUSY;
92 }
93
Steven Rostedt5d1a03d2009-03-23 23:38:49 -040094 calltime = trace_clock_local();
95
Steven Rostedt712406a2009-02-09 10:54:03 -080096 index = ++current->curr_ret_stack;
97 barrier();
98 current->ret_stack[index].ret = ret;
99 current->ret_stack[index].func = func;
Steven Rostedt5d1a03d2009-03-23 23:38:49 -0400100 current->ret_stack[index].calltime = calltime;
Steven Rostedta2a16d62009-03-24 23:17:58 -0400101 current->ret_stack[index].subtime = 0;
Steven Rostedt71e308a2009-06-18 12:45:08 -0400102 current->ret_stack[index].fp = frame_pointer;
Steven Rostedt712406a2009-02-09 10:54:03 -0800103 *depth = index;
104
105 return 0;
106}
107
108/* Retrieve a function return address to the trace stack on thread info.*/
Steven Rostedta2a16d62009-03-24 23:17:58 -0400109static void
Steven Rostedt71e308a2009-06-18 12:45:08 -0400110ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret,
111 unsigned long frame_pointer)
Steven Rostedt712406a2009-02-09 10:54:03 -0800112{
113 int index;
114
115 index = current->curr_ret_stack;
116
117 if (unlikely(index < 0)) {
118 ftrace_graph_stop();
119 WARN_ON(1);
120 /* Might as well panic, otherwise we have no where to go */
121 *ret = (unsigned long)panic;
122 return;
123 }
124
Steven Rostedt71e308a2009-06-18 12:45:08 -0400125#ifdef CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST
126 /*
127 * The arch may choose to record the frame pointer used
128 * and check it here to make sure that it is what we expect it
129 * to be. If gcc does not set the place holder of the return
130 * address in the frame pointer, and does a copy instead, then
131 * the function graph trace will fail. This test detects this
132 * case.
133 *
134 * Currently, x86_32 with optimize for size (-Os) makes the latest
135 * gcc do the above.
136 */
137 if (unlikely(current->ret_stack[index].fp != frame_pointer)) {
138 ftrace_graph_stop();
139 WARN(1, "Bad frame pointer: expected %lx, received %lx\n"
Steven Rostedtb375a112009-09-17 00:05:58 -0400140 " from func %ps return to %lx\n",
Steven Rostedt71e308a2009-06-18 12:45:08 -0400141 current->ret_stack[index].fp,
142 frame_pointer,
143 (void *)current->ret_stack[index].func,
144 current->ret_stack[index].ret);
145 *ret = (unsigned long)panic;
146 return;
147 }
148#endif
149
Steven Rostedt712406a2009-02-09 10:54:03 -0800150 *ret = current->ret_stack[index].ret;
151 trace->func = current->ret_stack[index].func;
152 trace->calltime = current->ret_stack[index].calltime;
153 trace->overrun = atomic_read(&current->trace_overrun);
154 trace->depth = index;
Steven Rostedt712406a2009-02-09 10:54:03 -0800155}
156
157/*
158 * Send the trace to the ring-buffer.
159 * @return the original return address.
160 */
Steven Rostedt71e308a2009-06-18 12:45:08 -0400161unsigned long ftrace_return_to_handler(unsigned long frame_pointer)
Steven Rostedt712406a2009-02-09 10:54:03 -0800162{
163 struct ftrace_graph_ret trace;
164 unsigned long ret;
165
Steven Rostedt71e308a2009-06-18 12:45:08 -0400166 ftrace_pop_return_trace(&trace, &ret, frame_pointer);
Frederic Weisbecker00126932009-03-05 01:49:22 +0100167 trace.rettime = trace_clock_local();
Steven Rostedt712406a2009-02-09 10:54:03 -0800168 ftrace_graph_return(&trace);
Steven Rostedta2a16d62009-03-24 23:17:58 -0400169 barrier();
170 current->curr_ret_stack--;
Steven Rostedt712406a2009-02-09 10:54:03 -0800171
172 if (unlikely(!ret)) {
173 ftrace_graph_stop();
174 WARN_ON(1);
175 /* Might as well panic. What else to do? */
176 ret = (unsigned long)panic;
177 }
178
179 return ret;
180}
181
Jiri Olsa62b915f2010-04-02 19:01:22 +0200182int __trace_graph_entry(struct trace_array *tr,
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200183 struct ftrace_graph_ent *trace,
184 unsigned long flags,
185 int pc)
186{
187 struct ftrace_event_call *call = &event_funcgraph_entry;
188 struct ring_buffer_event *event;
Steven Rostedte77405a2009-09-02 14:17:06 -0400189 struct ring_buffer *buffer = tr->buffer;
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200190 struct ftrace_graph_ent_entry *entry;
191
Rusty Russelldd17c8f2009-10-29 22:34:15 +0900192 if (unlikely(__this_cpu_read(ftrace_cpu_disabled)))
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200193 return 0;
194
Steven Rostedte77405a2009-09-02 14:17:06 -0400195 event = trace_buffer_lock_reserve(buffer, TRACE_GRAPH_ENT,
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200196 sizeof(*entry), flags, pc);
197 if (!event)
198 return 0;
199 entry = ring_buffer_event_data(event);
200 entry->graph_ent = *trace;
Steven Rostedte77405a2009-09-02 14:17:06 -0400201 if (!filter_current_check_discard(buffer, call, entry, event))
202 ring_buffer_unlock_commit(buffer, event);
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200203
204 return 1;
205}
206
207int trace_graph_entry(struct ftrace_graph_ent *trace)
208{
209 struct trace_array *tr = graph_array;
210 struct trace_array_cpu *data;
211 unsigned long flags;
212 long disabled;
213 int ret;
214 int cpu;
215 int pc;
216
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200217 if (!ftrace_trace_task(current))
218 return 0;
219
Lai Jiangshanea2c68a2010-01-13 19:38:30 +0800220 /* trace it when it is-nested-in or is a function enabled. */
221 if (!(trace->depth || ftrace_graph_addr(trace->func)))
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200222 return 0;
223
224 local_irq_save(flags);
225 cpu = raw_smp_processor_id();
226 data = tr->data[cpu];
227 disabled = atomic_inc_return(&data->disabled);
228 if (likely(disabled == 1)) {
229 pc = preempt_count();
230 ret = __trace_graph_entry(tr, trace, flags, pc);
231 } else {
232 ret = 0;
233 }
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200234
235 atomic_dec(&data->disabled);
236 local_irq_restore(flags);
237
238 return ret;
239}
240
Tim Bird0e950172010-02-25 15:36:43 -0800241int trace_graph_thresh_entry(struct ftrace_graph_ent *trace)
242{
243 if (tracing_thresh)
244 return 1;
245 else
246 return trace_graph_entry(trace);
247}
248
Jiri Olsa62b915f2010-04-02 19:01:22 +0200249void __trace_graph_return(struct trace_array *tr,
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200250 struct ftrace_graph_ret *trace,
251 unsigned long flags,
252 int pc)
253{
254 struct ftrace_event_call *call = &event_funcgraph_exit;
255 struct ring_buffer_event *event;
Steven Rostedte77405a2009-09-02 14:17:06 -0400256 struct ring_buffer *buffer = tr->buffer;
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200257 struct ftrace_graph_ret_entry *entry;
258
Rusty Russelldd17c8f2009-10-29 22:34:15 +0900259 if (unlikely(__this_cpu_read(ftrace_cpu_disabled)))
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200260 return;
261
Steven Rostedte77405a2009-09-02 14:17:06 -0400262 event = trace_buffer_lock_reserve(buffer, TRACE_GRAPH_RET,
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200263 sizeof(*entry), flags, pc);
264 if (!event)
265 return;
266 entry = ring_buffer_event_data(event);
267 entry->ret = *trace;
Steven Rostedte77405a2009-09-02 14:17:06 -0400268 if (!filter_current_check_discard(buffer, call, entry, event))
269 ring_buffer_unlock_commit(buffer, event);
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200270}
271
272void trace_graph_return(struct ftrace_graph_ret *trace)
273{
274 struct trace_array *tr = graph_array;
275 struct trace_array_cpu *data;
276 unsigned long flags;
277 long disabled;
278 int cpu;
279 int pc;
280
281 local_irq_save(flags);
282 cpu = raw_smp_processor_id();
283 data = tr->data[cpu];
284 disabled = atomic_inc_return(&data->disabled);
285 if (likely(disabled == 1)) {
286 pc = preempt_count();
287 __trace_graph_return(tr, trace, flags, pc);
288 }
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200289 atomic_dec(&data->disabled);
290 local_irq_restore(flags);
291}
292
Frederic Weisbecker24a53652010-01-14 08:23:15 +0100293void set_graph_array(struct trace_array *tr)
294{
295 graph_array = tr;
296
297 /* Make graph_array visible before we start tracing */
298
299 smp_mb();
300}
301
Tim Bird0e950172010-02-25 15:36:43 -0800302void trace_graph_thresh_return(struct ftrace_graph_ret *trace)
303{
304 if (tracing_thresh &&
305 (trace->rettime - trace->calltime < tracing_thresh))
306 return;
307 else
308 trace_graph_return(trace);
309}
310
Frederic Weisbeckerfb526072008-11-25 21:07:04 +0100311static int graph_trace_init(struct trace_array *tr)
312{
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200313 int ret;
314
Frederic Weisbecker24a53652010-01-14 08:23:15 +0100315 set_graph_array(tr);
Tim Bird0e950172010-02-25 15:36:43 -0800316 if (tracing_thresh)
317 ret = register_ftrace_graph(&trace_graph_thresh_return,
318 &trace_graph_thresh_entry);
319 else
320 ret = register_ftrace_graph(&trace_graph_return,
321 &trace_graph_entry);
Steven Rostedt660c7f92008-11-26 00:16:26 -0500322 if (ret)
323 return ret;
324 tracing_start_cmdline_record();
325
326 return 0;
Frederic Weisbeckerfb526072008-11-25 21:07:04 +0100327}
328
329static void graph_trace_reset(struct trace_array *tr)
330{
Steven Rostedt660c7f92008-11-26 00:16:26 -0500331 tracing_stop_cmdline_record();
332 unregister_ftrace_graph();
Frederic Weisbeckerfb526072008-11-25 21:07:04 +0100333}
334
Lai Jiangshan0c9e6f62009-07-28 20:26:06 +0800335static int max_bytes_for_cpu;
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100336
337static enum print_line_t
338print_graph_cpu(struct trace_seq *s, int cpu)
339{
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100340 int ret;
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100341
Ingo Molnard51090b2008-11-28 09:55:16 +0100342 /*
343 * Start with a space character - to make it stand out
344 * to the right a bit when trace output is pasted into
345 * email:
346 */
Lai Jiangshan0c9e6f62009-07-28 20:26:06 +0800347 ret = trace_seq_printf(s, " %*d) ", max_bytes_for_cpu, cpu);
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100348 if (!ret)
Ingo Molnard51090b2008-11-28 09:55:16 +0100349 return TRACE_TYPE_PARTIAL_LINE;
350
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100351 return TRACE_TYPE_HANDLED;
352}
353
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100354#define TRACE_GRAPH_PROCINFO_LENGTH 14
355
356static enum print_line_t
357print_graph_proc(struct trace_seq *s, pid_t pid)
358{
Steven Rostedt4ca53082009-03-16 19:20:15 -0400359 char comm[TASK_COMM_LEN];
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100360 /* sign + log10(MAX_INT) + '\0' */
361 char pid_str[11];
Steven Rostedt4ca53082009-03-16 19:20:15 -0400362 int spaces = 0;
363 int ret;
364 int len;
365 int i;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100366
Steven Rostedt4ca53082009-03-16 19:20:15 -0400367 trace_find_cmdline(pid, comm);
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100368 comm[7] = '\0';
369 sprintf(pid_str, "%d", pid);
370
371 /* 1 stands for the "-" character */
372 len = strlen(comm) + strlen(pid_str) + 1;
373
374 if (len < TRACE_GRAPH_PROCINFO_LENGTH)
375 spaces = TRACE_GRAPH_PROCINFO_LENGTH - len;
376
377 /* First spaces to align center */
378 for (i = 0; i < spaces / 2; i++) {
379 ret = trace_seq_printf(s, " ");
380 if (!ret)
381 return TRACE_TYPE_PARTIAL_LINE;
382 }
383
384 ret = trace_seq_printf(s, "%s-%s", comm, pid_str);
385 if (!ret)
386 return TRACE_TYPE_PARTIAL_LINE;
387
388 /* Last spaces to align center */
389 for (i = 0; i < spaces - (spaces / 2); i++) {
390 ret = trace_seq_printf(s, " ");
391 if (!ret)
392 return TRACE_TYPE_PARTIAL_LINE;
393 }
394 return TRACE_TYPE_HANDLED;
395}
396
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100397
Steven Rostedt49ff5902009-09-11 00:30:26 -0400398static enum print_line_t
399print_graph_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
400{
Steven Rostedtf81c9722009-09-11 14:24:13 -0400401 if (!trace_seq_putc(s, ' '))
Steven Rostedt49ff5902009-09-11 00:30:26 -0400402 return 0;
403
Steven Rostedtf81c9722009-09-11 14:24:13 -0400404 return trace_print_lat_fmt(s, entry);
Steven Rostedt49ff5902009-09-11 00:30:26 -0400405}
406
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100407/* If the pid changed since the last trace, output this event */
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100408static enum print_line_t
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400409verif_pid(struct trace_seq *s, pid_t pid, int cpu, struct fgraph_data *data)
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100410{
Ingo Molnard51090b2008-11-28 09:55:16 +0100411 pid_t prev_pid;
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800412 pid_t *last_pid;
Ingo Molnard51090b2008-11-28 09:55:16 +0100413 int ret;
Steven Rostedt660c7f92008-11-26 00:16:26 -0500414
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400415 if (!data)
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100416 return TRACE_TYPE_HANDLED;
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100417
Jiri Olsabe1eca32009-11-24 13:57:38 +0100418 last_pid = &(per_cpu_ptr(data->cpu_data, cpu)->last_pid);
Steven Rostedt660c7f92008-11-26 00:16:26 -0500419
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800420 if (*last_pid == pid)
421 return TRACE_TYPE_HANDLED;
422
423 prev_pid = *last_pid;
424 *last_pid = pid;
425
426 if (prev_pid == -1)
427 return TRACE_TYPE_HANDLED;
Ingo Molnard51090b2008-11-28 09:55:16 +0100428/*
429 * Context-switch trace line:
430
431 ------------------------------------------
432 | 1) migration/0--1 => sshd-1755
433 ------------------------------------------
434
435 */
436 ret = trace_seq_printf(s,
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +0100437 " ------------------------------------------\n");
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100438 if (!ret)
Wenji Huang810dc732009-02-10 01:03:05 -0500439 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100440
441 ret = print_graph_cpu(s, cpu);
442 if (ret == TRACE_TYPE_PARTIAL_LINE)
Wenji Huang810dc732009-02-10 01:03:05 -0500443 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100444
445 ret = print_graph_proc(s, prev_pid);
446 if (ret == TRACE_TYPE_PARTIAL_LINE)
Wenji Huang810dc732009-02-10 01:03:05 -0500447 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100448
449 ret = trace_seq_printf(s, " => ");
450 if (!ret)
Wenji Huang810dc732009-02-10 01:03:05 -0500451 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100452
453 ret = print_graph_proc(s, pid);
454 if (ret == TRACE_TYPE_PARTIAL_LINE)
Wenji Huang810dc732009-02-10 01:03:05 -0500455 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100456
457 ret = trace_seq_printf(s,
458 "\n ------------------------------------------\n\n");
459 if (!ret)
Wenji Huang810dc732009-02-10 01:03:05 -0500460 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100461
Wenji Huang810dc732009-02-10 01:03:05 -0500462 return TRACE_TYPE_HANDLED;
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100463}
464
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100465static struct ftrace_graph_ret_entry *
466get_return_for_leaf(struct trace_iterator *iter,
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100467 struct ftrace_graph_ent_entry *curr)
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100468{
Jiri Olsabe1eca32009-11-24 13:57:38 +0100469 struct fgraph_data *data = iter->private;
470 struct ring_buffer_iter *ring_iter = NULL;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100471 struct ring_buffer_event *event;
472 struct ftrace_graph_ret_entry *next;
473
Jiri Olsabe1eca32009-11-24 13:57:38 +0100474 /*
475 * If the previous output failed to write to the seq buffer,
476 * then we just reuse the data from before.
477 */
478 if (data && data->failed) {
479 curr = &data->ent;
480 next = &data->ret;
481 } else {
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100482
Jiri Olsabe1eca32009-11-24 13:57:38 +0100483 ring_iter = iter->buffer_iter[iter->cpu];
484
485 /* First peek to compare current entry and the next one */
486 if (ring_iter)
487 event = ring_buffer_iter_peek(ring_iter, NULL);
488 else {
489 /*
490 * We need to consume the current entry to see
491 * the next one.
492 */
Steven Rostedt66a8cb92010-03-31 13:21:56 -0400493 ring_buffer_consume(iter->tr->buffer, iter->cpu,
494 NULL, NULL);
Jiri Olsabe1eca32009-11-24 13:57:38 +0100495 event = ring_buffer_peek(iter->tr->buffer, iter->cpu,
Steven Rostedt66a8cb92010-03-31 13:21:56 -0400496 NULL, NULL);
Jiri Olsabe1eca32009-11-24 13:57:38 +0100497 }
498
499 if (!event)
500 return NULL;
501
502 next = ring_buffer_event_data(event);
503
504 if (data) {
505 /*
506 * Save current and next entries for later reference
507 * if the output fails.
508 */
509 data->ent = *curr;
510 data->ret = *next;
511 }
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100512 }
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100513
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100514 if (next->ent.type != TRACE_GRAPH_RET)
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100515 return NULL;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100516
517 if (curr->ent.pid != next->ent.pid ||
518 curr->graph_ent.func != next->ret.func)
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100519 return NULL;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100520
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100521 /* this is a leaf, now advance the iterator */
522 if (ring_iter)
523 ring_buffer_read(ring_iter, NULL);
524
525 return next;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100526}
527
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800528/* Signal a overhead of time execution to the output */
529static int
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200530print_graph_overhead(unsigned long long duration, struct trace_seq *s,
531 u32 flags)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800532{
533 /* If duration disappear, we don't need anything */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200534 if (!(flags & TRACE_GRAPH_PRINT_DURATION))
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800535 return 1;
536
537 /* Non nested entry or return */
538 if (duration == -1)
539 return trace_seq_printf(s, " ");
540
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200541 if (flags & TRACE_GRAPH_PRINT_OVERHEAD) {
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800542 /* Duration exceeded 100 msecs */
543 if (duration > 100000ULL)
544 return trace_seq_printf(s, "! ");
545
546 /* Duration exceeded 10 msecs */
547 if (duration > 10000ULL)
548 return trace_seq_printf(s, "+ ");
549 }
550
551 return trace_seq_printf(s, " ");
552}
553
Frederic Weisbeckerd1f9cbd2009-02-18 04:25:25 +0100554static int print_graph_abs_time(u64 t, struct trace_seq *s)
555{
556 unsigned long usecs_rem;
557
558 usecs_rem = do_div(t, NSEC_PER_SEC);
559 usecs_rem /= 1000;
560
561 return trace_seq_printf(s, "%5lu.%06lu | ",
562 (unsigned long)t, usecs_rem);
563}
564
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100565static enum print_line_t
Frederic Weisbeckerd1f9cbd2009-02-18 04:25:25 +0100566print_graph_irq(struct trace_iterator *iter, unsigned long addr,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200567 enum trace_type type, int cpu, pid_t pid, u32 flags)
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100568{
569 int ret;
Frederic Weisbeckerd1f9cbd2009-02-18 04:25:25 +0100570 struct trace_seq *s = &iter->seq;
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100571
572 if (addr < (unsigned long)__irqentry_text_start ||
573 addr >= (unsigned long)__irqentry_text_end)
574 return TRACE_TYPE_UNHANDLED;
575
Frederic Weisbeckerd1f9cbd2009-02-18 04:25:25 +0100576 /* Absolute time */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200577 if (flags & TRACE_GRAPH_PRINT_ABS_TIME) {
Frederic Weisbeckerd1f9cbd2009-02-18 04:25:25 +0100578 ret = print_graph_abs_time(iter->ts, s);
579 if (!ret)
580 return TRACE_TYPE_PARTIAL_LINE;
581 }
582
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800583 /* Cpu */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200584 if (flags & TRACE_GRAPH_PRINT_CPU) {
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800585 ret = print_graph_cpu(s, cpu);
586 if (ret == TRACE_TYPE_PARTIAL_LINE)
587 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100588 }
Steven Rostedt49ff5902009-09-11 00:30:26 -0400589
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800590 /* Proc */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200591 if (flags & TRACE_GRAPH_PRINT_PROC) {
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800592 ret = print_graph_proc(s, pid);
593 if (ret == TRACE_TYPE_PARTIAL_LINE)
594 return TRACE_TYPE_PARTIAL_LINE;
595 ret = trace_seq_printf(s, " | ");
596 if (!ret)
597 return TRACE_TYPE_PARTIAL_LINE;
598 }
599
600 /* No overhead */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200601 ret = print_graph_overhead(-1, s, flags);
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800602 if (!ret)
603 return TRACE_TYPE_PARTIAL_LINE;
604
605 if (type == TRACE_GRAPH_ENT)
606 ret = trace_seq_printf(s, "==========>");
607 else
608 ret = trace_seq_printf(s, "<==========");
609
610 if (!ret)
611 return TRACE_TYPE_PARTIAL_LINE;
612
613 /* Don't close the duration column if haven't one */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200614 if (flags & TRACE_GRAPH_PRINT_DURATION)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800615 trace_seq_printf(s, " |");
616 ret = trace_seq_printf(s, "\n");
617
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100618 if (!ret)
619 return TRACE_TYPE_PARTIAL_LINE;
620 return TRACE_TYPE_HANDLED;
621}
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100622
Steven Rostedt0706f1c2009-03-23 23:12:58 -0400623enum print_line_t
624trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100625{
626 unsigned long nsecs_rem = do_div(duration, 1000);
Frederic Weisbecker166d3c72008-12-03 02:32:12 +0100627 /* log10(ULONG_MAX) + '\0' */
628 char msecs_str[21];
629 char nsecs_str[5];
630 int ret, len;
631 int i;
632
633 sprintf(msecs_str, "%lu", (unsigned long) duration);
634
635 /* Print msecs */
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800636 ret = trace_seq_printf(s, "%s", msecs_str);
Frederic Weisbecker166d3c72008-12-03 02:32:12 +0100637 if (!ret)
638 return TRACE_TYPE_PARTIAL_LINE;
639
640 len = strlen(msecs_str);
641
642 /* Print nsecs (we don't want to exceed 7 numbers) */
643 if (len < 7) {
Chase Douglasd62f85d2010-06-15 12:29:15 -0400644 snprintf(nsecs_str, min(sizeof(nsecs_str), 8UL - len), "%03lu",
645 nsecs_rem);
Frederic Weisbecker166d3c72008-12-03 02:32:12 +0100646 ret = trace_seq_printf(s, ".%s", nsecs_str);
647 if (!ret)
648 return TRACE_TYPE_PARTIAL_LINE;
649 len += strlen(nsecs_str);
650 }
651
652 ret = trace_seq_printf(s, " us ");
653 if (!ret)
654 return TRACE_TYPE_PARTIAL_LINE;
655
656 /* Print remaining spaces to fit the row's width */
657 for (i = len; i < 7; i++) {
658 ret = trace_seq_printf(s, " ");
659 if (!ret)
660 return TRACE_TYPE_PARTIAL_LINE;
661 }
Steven Rostedt0706f1c2009-03-23 23:12:58 -0400662 return TRACE_TYPE_HANDLED;
663}
664
665static enum print_line_t
666print_graph_duration(unsigned long long duration, struct trace_seq *s)
667{
668 int ret;
669
670 ret = trace_print_graph_duration(duration, s);
671 if (ret != TRACE_TYPE_HANDLED)
672 return ret;
Frederic Weisbecker166d3c72008-12-03 02:32:12 +0100673
674 ret = trace_seq_printf(s, "| ");
675 if (!ret)
676 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker166d3c72008-12-03 02:32:12 +0100677
Steven Rostedt0706f1c2009-03-23 23:12:58 -0400678 return TRACE_TYPE_HANDLED;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100679}
680
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100681/* Case of a leaf function on its call entry */
682static enum print_line_t
683print_graph_entry_leaf(struct trace_iterator *iter,
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100684 struct ftrace_graph_ent_entry *entry,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200685 struct ftrace_graph_ret_entry *ret_entry,
686 struct trace_seq *s, u32 flags)
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100687{
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400688 struct fgraph_data *data = iter->private;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100689 struct ftrace_graph_ret *graph_ret;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100690 struct ftrace_graph_ent *call;
691 unsigned long long duration;
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100692 int ret;
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100693 int i;
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100694
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100695 graph_ret = &ret_entry->ret;
696 call = &entry->graph_ent;
697 duration = graph_ret->rettime - graph_ret->calltime;
Steven Rostedt437f24fb2008-11-26 00:16:27 -0500698
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400699 if (data) {
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500700 struct fgraph_cpu_data *cpu_data;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400701 int cpu = iter->cpu;
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500702
703 cpu_data = per_cpu_ptr(data->cpu_data, cpu);
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400704
705 /*
706 * Comments display at + 1 to depth. Since
707 * this is a leaf function, keep the comments
708 * equal to this depth.
709 */
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500710 cpu_data->depth = call->depth - 1;
711
712 /* No need to keep this function around for this depth */
713 if (call->depth < FTRACE_RETFUNC_DEPTH)
714 cpu_data->enter_funcs[call->depth] = 0;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400715 }
716
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100717 /* Overhead */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200718 ret = print_graph_overhead(duration, s, flags);
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800719 if (!ret)
720 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100721
722 /* Duration */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200723 if (flags & TRACE_GRAPH_PRINT_DURATION) {
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800724 ret = print_graph_duration(duration, s);
725 if (ret == TRACE_TYPE_PARTIAL_LINE)
726 return TRACE_TYPE_PARTIAL_LINE;
727 }
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100728
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100729 /* Function */
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100730 for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
731 ret = trace_seq_printf(s, " ");
732 if (!ret)
733 return TRACE_TYPE_PARTIAL_LINE;
734 }
735
Steven Rostedtb375a112009-09-17 00:05:58 -0400736 ret = trace_seq_printf(s, "%ps();\n", (void *)call->func);
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100737 if (!ret)
738 return TRACE_TYPE_PARTIAL_LINE;
739
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100740 return TRACE_TYPE_HANDLED;
741}
742
743static enum print_line_t
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400744print_graph_entry_nested(struct trace_iterator *iter,
745 struct ftrace_graph_ent_entry *entry,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200746 struct trace_seq *s, int cpu, u32 flags)
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100747{
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100748 struct ftrace_graph_ent *call = &entry->graph_ent;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400749 struct fgraph_data *data = iter->private;
750 int ret;
751 int i;
752
753 if (data) {
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500754 struct fgraph_cpu_data *cpu_data;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400755 int cpu = iter->cpu;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400756
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500757 cpu_data = per_cpu_ptr(data->cpu_data, cpu);
758 cpu_data->depth = call->depth;
759
760 /* Save this function pointer to see if the exit matches */
761 if (call->depth < FTRACE_RETFUNC_DEPTH)
762 cpu_data->enter_funcs[call->depth] = call->func;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400763 }
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100764
765 /* No overhead */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200766 ret = print_graph_overhead(-1, s, flags);
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800767 if (!ret)
768 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100769
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800770 /* No time */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200771 if (flags & TRACE_GRAPH_PRINT_DURATION) {
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100772 ret = trace_seq_printf(s, " | ");
773 if (!ret)
774 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100775 }
776
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100777 /* Function */
778 for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
779 ret = trace_seq_printf(s, " ");
780 if (!ret)
781 return TRACE_TYPE_PARTIAL_LINE;
782 }
783
Steven Rostedtb375a112009-09-17 00:05:58 -0400784 ret = trace_seq_printf(s, "%ps() {\n", (void *)call->func);
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100785 if (!ret)
786 return TRACE_TYPE_PARTIAL_LINE;
787
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100788 /*
789 * we already consumed the current entry to check the next one
790 * and see if this is a leaf.
791 */
792 return TRACE_TYPE_NO_CONSUME;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100793}
794
795static enum print_line_t
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400796print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200797 int type, unsigned long addr, u32 flags)
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100798{
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400799 struct fgraph_data *data = iter->private;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100800 struct trace_entry *ent = iter->ent;
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400801 int cpu = iter->cpu;
802 int ret;
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100803
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100804 /* Pid */
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400805 if (verif_pid(s, ent->pid, cpu, data) == TRACE_TYPE_PARTIAL_LINE)
Steven Rostedt437f24fb2008-11-26 00:16:27 -0500806 return TRACE_TYPE_PARTIAL_LINE;
807
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400808 if (type) {
809 /* Interrupt */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200810 ret = print_graph_irq(iter, addr, type, cpu, ent->pid, flags);
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400811 if (ret == TRACE_TYPE_PARTIAL_LINE)
812 return TRACE_TYPE_PARTIAL_LINE;
813 }
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800814
815 /* Absolute time */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200816 if (flags & TRACE_GRAPH_PRINT_ABS_TIME) {
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800817 ret = print_graph_abs_time(iter->ts, s);
818 if (!ret)
819 return TRACE_TYPE_PARTIAL_LINE;
820 }
821
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100822 /* Cpu */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200823 if (flags & TRACE_GRAPH_PRINT_CPU) {
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100824 ret = print_graph_cpu(s, cpu);
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100825 if (ret == TRACE_TYPE_PARTIAL_LINE)
826 return TRACE_TYPE_PARTIAL_LINE;
827 }
828
829 /* Proc */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200830 if (flags & TRACE_GRAPH_PRINT_PROC) {
Ingo Molnar00a8bf82009-02-19 13:01:37 +0100831 ret = print_graph_proc(s, ent->pid);
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100832 if (ret == TRACE_TYPE_PARTIAL_LINE)
833 return TRACE_TYPE_PARTIAL_LINE;
834
835 ret = trace_seq_printf(s, " | ");
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100836 if (!ret)
837 return TRACE_TYPE_PARTIAL_LINE;
838 }
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100839
Steven Rostedt49ff5902009-09-11 00:30:26 -0400840 /* Latency format */
841 if (trace_flags & TRACE_ITER_LATENCY_FMT) {
842 ret = print_graph_lat_fmt(s, ent);
843 if (ret == TRACE_TYPE_PARTIAL_LINE)
844 return TRACE_TYPE_PARTIAL_LINE;
845 }
846
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400847 return 0;
848}
849
850static enum print_line_t
851print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200852 struct trace_iterator *iter, u32 flags)
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400853{
Jiri Olsabe1eca32009-11-24 13:57:38 +0100854 struct fgraph_data *data = iter->private;
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400855 struct ftrace_graph_ent *call = &field->graph_ent;
856 struct ftrace_graph_ret_entry *leaf_ret;
Jiri Olsabe1eca32009-11-24 13:57:38 +0100857 static enum print_line_t ret;
858 int cpu = iter->cpu;
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400859
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200860 if (print_graph_prologue(iter, s, TRACE_GRAPH_ENT, call->func, flags))
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400861 return TRACE_TYPE_PARTIAL_LINE;
862
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100863 leaf_ret = get_return_for_leaf(iter, field);
864 if (leaf_ret)
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200865 ret = print_graph_entry_leaf(iter, field, leaf_ret, s, flags);
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100866 else
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200867 ret = print_graph_entry_nested(iter, field, s, cpu, flags);
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100868
Jiri Olsabe1eca32009-11-24 13:57:38 +0100869 if (data) {
870 /*
871 * If we failed to write our output, then we need to make
872 * note of it. Because we already consumed our entry.
873 */
874 if (s->full) {
875 data->failed = 1;
876 data->cpu = cpu;
877 } else
878 data->failed = 0;
879 }
880
881 return ret;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100882}
883
884static enum print_line_t
885print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200886 struct trace_entry *ent, struct trace_iterator *iter,
887 u32 flags)
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100888{
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100889 unsigned long long duration = trace->rettime - trace->calltime;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400890 struct fgraph_data *data = iter->private;
891 pid_t pid = ent->pid;
892 int cpu = iter->cpu;
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500893 int func_match = 1;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400894 int ret;
895 int i;
896
897 if (data) {
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500898 struct fgraph_cpu_data *cpu_data;
899 int cpu = iter->cpu;
900
901 cpu_data = per_cpu_ptr(data->cpu_data, cpu);
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400902
903 /*
904 * Comments display at + 1 to depth. This is the
905 * return from a function, we now want the comments
906 * to display at the same level of the bracket.
907 */
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500908 cpu_data->depth = trace->depth - 1;
909
910 if (trace->depth < FTRACE_RETFUNC_DEPTH) {
911 if (cpu_data->enter_funcs[trace->depth] != trace->func)
912 func_match = 0;
913 cpu_data->enter_funcs[trace->depth] = 0;
914 }
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400915 }
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100916
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200917 if (print_graph_prologue(iter, s, 0, 0, flags))
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100918 return TRACE_TYPE_PARTIAL_LINE;
919
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100920 /* Overhead */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200921 ret = print_graph_overhead(duration, s, flags);
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800922 if (!ret)
923 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100924
925 /* Duration */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200926 if (flags & TRACE_GRAPH_PRINT_DURATION) {
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800927 ret = print_graph_duration(duration, s);
928 if (ret == TRACE_TYPE_PARTIAL_LINE)
929 return TRACE_TYPE_PARTIAL_LINE;
930 }
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100931
932 /* Closing brace */
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100933 for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
934 ret = trace_seq_printf(s, " ");
935 if (!ret)
936 return TRACE_TYPE_PARTIAL_LINE;
937 }
938
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500939 /*
940 * If the return function does not have a matching entry,
941 * then the entry was lost. Instead of just printing
942 * the '}' and letting the user guess what function this
943 * belongs to, write out the function name.
944 */
945 if (func_match) {
946 ret = trace_seq_printf(s, "}\n");
947 if (!ret)
948 return TRACE_TYPE_PARTIAL_LINE;
949 } else {
Steven Rostedta094fe02010-03-05 20:08:58 -0500950 ret = trace_seq_printf(s, "} /* %ps */\n", (void *)trace->func);
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500951 if (!ret)
952 return TRACE_TYPE_PARTIAL_LINE;
953 }
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100954
955 /* Overrun */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200956 if (flags & TRACE_GRAPH_PRINT_OVERRUN) {
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100957 ret = trace_seq_printf(s, " (Overruns: %lu)\n",
958 trace->overrun);
959 if (!ret)
960 return TRACE_TYPE_PARTIAL_LINE;
961 }
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100962
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200963 ret = print_graph_irq(iter, trace->func, TRACE_GRAPH_RET,
964 cpu, pid, flags);
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100965 if (ret == TRACE_TYPE_PARTIAL_LINE)
966 return TRACE_TYPE_PARTIAL_LINE;
967
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100968 return TRACE_TYPE_HANDLED;
969}
Frederic Weisbeckerfb526072008-11-25 21:07:04 +0100970
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +0100971static enum print_line_t
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200972print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
973 struct trace_iterator *iter, u32 flags)
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +0100974{
Steven Rostedt5087f8d2009-03-19 15:14:46 -0400975 unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400976 struct fgraph_data *data = iter->private;
Steven Rostedt5087f8d2009-03-19 15:14:46 -0400977 struct trace_event *event;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400978 int depth = 0;
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +0100979 int ret;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400980 int i;
981
982 if (data)
Jiri Olsabe1eca32009-11-24 13:57:38 +0100983 depth = per_cpu_ptr(data->cpu_data, iter->cpu)->depth;
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800984
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200985 if (print_graph_prologue(iter, s, 0, 0, flags))
Frederic Weisbeckerd1f9cbd2009-02-18 04:25:25 +0100986 return TRACE_TYPE_PARTIAL_LINE;
987
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +0100988 /* No overhead */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200989 ret = print_graph_overhead(-1, s, flags);
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800990 if (!ret)
991 return TRACE_TYPE_PARTIAL_LINE;
992
993 /* No time */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200994 if (flags & TRACE_GRAPH_PRINT_DURATION) {
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800995 ret = trace_seq_printf(s, " | ");
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +0100996 if (!ret)
997 return TRACE_TYPE_PARTIAL_LINE;
998 }
999
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001000 /* Indentation */
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001001 if (depth > 0)
1002 for (i = 0; i < (depth + 1) * TRACE_GRAPH_INDENT; i++) {
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001003 ret = trace_seq_printf(s, " ");
1004 if (!ret)
1005 return TRACE_TYPE_PARTIAL_LINE;
1006 }
1007
1008 /* The comment */
Frederic Weisbecker769b0442009-03-06 17:21:49 +01001009 ret = trace_seq_printf(s, "/* ");
1010 if (!ret)
1011 return TRACE_TYPE_PARTIAL_LINE;
1012
Steven Rostedt5087f8d2009-03-19 15:14:46 -04001013 switch (iter->ent->type) {
1014 case TRACE_BPRINT:
1015 ret = trace_print_bprintk_msg_only(iter);
1016 if (ret != TRACE_TYPE_HANDLED)
1017 return ret;
1018 break;
1019 case TRACE_PRINT:
1020 ret = trace_print_printk_msg_only(iter);
1021 if (ret != TRACE_TYPE_HANDLED)
1022 return ret;
1023 break;
1024 default:
1025 event = ftrace_find_event(ent->type);
1026 if (!event)
1027 return TRACE_TYPE_UNHANDLED;
1028
Steven Rostedta9a57762010-04-22 18:46:14 -04001029 ret = event->funcs->trace(iter, sym_flags, event);
Steven Rostedt5087f8d2009-03-19 15:14:46 -04001030 if (ret != TRACE_TYPE_HANDLED)
1031 return ret;
1032 }
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001033
Frederic Weisbecker412d0bb2008-12-24 01:43:25 +01001034 /* Strip ending newline */
1035 if (s->buffer[s->len - 1] == '\n') {
1036 s->buffer[s->len - 1] = '\0';
1037 s->len--;
1038 }
1039
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001040 ret = trace_seq_printf(s, " */\n");
1041 if (!ret)
1042 return TRACE_TYPE_PARTIAL_LINE;
1043
1044 return TRACE_TYPE_HANDLED;
1045}
1046
1047
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001048enum print_line_t
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001049print_graph_function_flags(struct trace_iterator *iter, u32 flags)
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001050{
Jiri Olsabe1eca32009-11-24 13:57:38 +01001051 struct ftrace_graph_ent_entry *field;
1052 struct fgraph_data *data = iter->private;
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001053 struct trace_entry *entry = iter->ent;
Steven Rostedt5087f8d2009-03-19 15:14:46 -04001054 struct trace_seq *s = &iter->seq;
Jiri Olsabe1eca32009-11-24 13:57:38 +01001055 int cpu = iter->cpu;
1056 int ret;
1057
1058 if (data && per_cpu_ptr(data->cpu_data, cpu)->ignore) {
1059 per_cpu_ptr(data->cpu_data, cpu)->ignore = 0;
1060 return TRACE_TYPE_HANDLED;
1061 }
1062
1063 /*
1064 * If the last output failed, there's a possibility we need
1065 * to print out the missing entry which would never go out.
1066 */
1067 if (data && data->failed) {
1068 field = &data->ent;
1069 iter->cpu = data->cpu;
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001070 ret = print_graph_entry(field, s, iter, flags);
Jiri Olsabe1eca32009-11-24 13:57:38 +01001071 if (ret == TRACE_TYPE_HANDLED && iter->cpu != cpu) {
1072 per_cpu_ptr(data->cpu_data, iter->cpu)->ignore = 1;
1073 ret = TRACE_TYPE_NO_CONSUME;
1074 }
1075 iter->cpu = cpu;
1076 return ret;
1077 }
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001078
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001079 switch (entry->type) {
1080 case TRACE_GRAPH_ENT: {
Lai Jiangshan38ceb592009-07-28 20:11:24 +08001081 /*
1082 * print_graph_entry() may consume the current event,
1083 * thus @field may become invalid, so we need to save it.
1084 * sizeof(struct ftrace_graph_ent_entry) is very small,
1085 * it can be safely saved at the stack.
1086 */
Jiri Olsabe1eca32009-11-24 13:57:38 +01001087 struct ftrace_graph_ent_entry saved;
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001088 trace_assign_type(field, entry);
Lai Jiangshan38ceb592009-07-28 20:11:24 +08001089 saved = *field;
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001090 return print_graph_entry(&saved, s, iter, flags);
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001091 }
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001092 case TRACE_GRAPH_RET: {
1093 struct ftrace_graph_ret_entry *field;
1094 trace_assign_type(field, entry);
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001095 return print_graph_return(&field->ret, s, entry, iter, flags);
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001096 }
Jiri Olsa62b915f2010-04-02 19:01:22 +02001097 case TRACE_STACK:
1098 case TRACE_FN:
1099 /* dont trace stack and functions as comments */
1100 return TRACE_TYPE_UNHANDLED;
1101
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001102 default:
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001103 return print_graph_comment(s, entry, iter, flags);
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001104 }
Steven Rostedt5087f8d2009-03-19 15:14:46 -04001105
1106 return TRACE_TYPE_HANDLED;
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001107}
1108
Jiri Olsa9106b692010-04-02 19:01:20 +02001109static enum print_line_t
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001110print_graph_function(struct trace_iterator *iter)
1111{
1112 return print_graph_function_flags(iter, tracer_flags.val);
1113}
1114
1115static enum print_line_t
Steven Rostedta9a57762010-04-22 18:46:14 -04001116print_graph_function_event(struct trace_iterator *iter, int flags,
1117 struct trace_event *event)
Jiri Olsa9106b692010-04-02 19:01:20 +02001118{
1119 return print_graph_function(iter);
1120}
1121
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001122static void print_lat_header(struct seq_file *s, u32 flags)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001123{
1124 static const char spaces[] = " " /* 16 spaces */
1125 " " /* 4 spaces */
1126 " "; /* 17 spaces */
1127 int size = 0;
1128
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001129 if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001130 size += 16;
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001131 if (flags & TRACE_GRAPH_PRINT_CPU)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001132 size += 4;
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001133 if (flags & TRACE_GRAPH_PRINT_PROC)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001134 size += 17;
1135
1136 seq_printf(s, "#%.*s _-----=> irqs-off \n", size, spaces);
1137 seq_printf(s, "#%.*s / _----=> need-resched \n", size, spaces);
1138 seq_printf(s, "#%.*s| / _---=> hardirq/softirq \n", size, spaces);
1139 seq_printf(s, "#%.*s|| / _--=> preempt-depth \n", size, spaces);
Steven Rostedt637e7e82009-09-11 13:55:35 -04001140 seq_printf(s, "#%.*s||| / _-=> lock-depth \n", size, spaces);
1141 seq_printf(s, "#%.*s|||| / \n", size, spaces);
Steven Rostedt49ff5902009-09-11 00:30:26 -04001142}
1143
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001144void print_graph_headers_flags(struct seq_file *s, u32 flags)
Frederic Weisbeckerdecbec32008-12-08 01:56:06 +01001145{
Steven Rostedt49ff5902009-09-11 00:30:26 -04001146 int lat = trace_flags & TRACE_ITER_LATENCY_FMT;
1147
1148 if (lat)
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001149 print_lat_header(s, flags);
Steven Rostedt49ff5902009-09-11 00:30:26 -04001150
Frederic Weisbeckerdecbec32008-12-08 01:56:06 +01001151 /* 1st line */
Steven Rostedt49ff5902009-09-11 00:30:26 -04001152 seq_printf(s, "#");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001153 if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001154 seq_printf(s, " TIME ");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001155 if (flags & TRACE_GRAPH_PRINT_CPU)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001156 seq_printf(s, " CPU");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001157 if (flags & TRACE_GRAPH_PRINT_PROC)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001158 seq_printf(s, " TASK/PID ");
1159 if (lat)
Steven Rostedt637e7e82009-09-11 13:55:35 -04001160 seq_printf(s, "|||||");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001161 if (flags & TRACE_GRAPH_PRINT_DURATION)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001162 seq_printf(s, " DURATION ");
1163 seq_printf(s, " FUNCTION CALLS\n");
Frederic Weisbeckerdecbec32008-12-08 01:56:06 +01001164
1165 /* 2nd line */
Steven Rostedt49ff5902009-09-11 00:30:26 -04001166 seq_printf(s, "#");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001167 if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001168 seq_printf(s, " | ");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001169 if (flags & TRACE_GRAPH_PRINT_CPU)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001170 seq_printf(s, " | ");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001171 if (flags & TRACE_GRAPH_PRINT_PROC)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001172 seq_printf(s, " | | ");
1173 if (lat)
Steven Rostedt637e7e82009-09-11 13:55:35 -04001174 seq_printf(s, "|||||");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001175 if (flags & TRACE_GRAPH_PRINT_DURATION)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001176 seq_printf(s, " | | ");
1177 seq_printf(s, " | | | |\n");
Frederic Weisbeckerdecbec32008-12-08 01:56:06 +01001178}
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001179
Jiri Olsa62b915f2010-04-02 19:01:22 +02001180void print_graph_headers(struct seq_file *s)
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001181{
1182 print_graph_headers_flags(s, tracer_flags.val);
1183}
1184
Jiri Olsa62b915f2010-04-02 19:01:22 +02001185void graph_trace_open(struct trace_iterator *iter)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001186{
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001187 /* pid and depth on the last trace processed */
Jiri Olsabe1eca32009-11-24 13:57:38 +01001188 struct fgraph_data *data;
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001189 int cpu;
1190
Jiri Olsabe1eca32009-11-24 13:57:38 +01001191 iter->private = NULL;
1192
1193 data = kzalloc(sizeof(*data), GFP_KERNEL);
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001194 if (!data)
Jiri Olsabe1eca32009-11-24 13:57:38 +01001195 goto out_err;
1196
1197 data->cpu_data = alloc_percpu(struct fgraph_cpu_data);
1198 if (!data->cpu_data)
1199 goto out_err_free;
1200
1201 for_each_possible_cpu(cpu) {
1202 pid_t *pid = &(per_cpu_ptr(data->cpu_data, cpu)->last_pid);
1203 int *depth = &(per_cpu_ptr(data->cpu_data, cpu)->depth);
1204 int *ignore = &(per_cpu_ptr(data->cpu_data, cpu)->ignore);
1205 *pid = -1;
1206 *depth = 0;
1207 *ignore = 0;
1208 }
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001209
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001210 iter->private = data;
Jiri Olsabe1eca32009-11-24 13:57:38 +01001211
1212 return;
1213
1214 out_err_free:
1215 kfree(data);
1216 out_err:
1217 pr_warning("function graph tracer: not enough memory\n");
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001218}
1219
Jiri Olsa62b915f2010-04-02 19:01:22 +02001220void graph_trace_close(struct trace_iterator *iter)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001221{
Jiri Olsabe1eca32009-11-24 13:57:38 +01001222 struct fgraph_data *data = iter->private;
1223
1224 if (data) {
1225 free_percpu(data->cpu_data);
1226 kfree(data);
1227 }
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001228}
1229
Steven Rostedta9a57762010-04-22 18:46:14 -04001230static struct trace_event_functions graph_functions = {
1231 .trace = print_graph_function_event,
1232};
1233
Jiri Olsa9106b692010-04-02 19:01:20 +02001234static struct trace_event graph_trace_entry_event = {
1235 .type = TRACE_GRAPH_ENT,
Steven Rostedta9a57762010-04-22 18:46:14 -04001236 .funcs = &graph_functions,
Jiri Olsa9106b692010-04-02 19:01:20 +02001237};
1238
1239static struct trace_event graph_trace_ret_event = {
1240 .type = TRACE_GRAPH_RET,
Steven Rostedta9a57762010-04-22 18:46:14 -04001241 .funcs = &graph_functions
Jiri Olsa9106b692010-04-02 19:01:20 +02001242};
1243
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001244static struct tracer graph_trace __read_mostly = {
Steven Rostedtef180122009-03-10 14:10:56 -04001245 .name = "function_graph",
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001246 .open = graph_trace_open,
Jiri Olsabe1eca32009-11-24 13:57:38 +01001247 .pipe_open = graph_trace_open,
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001248 .close = graph_trace_close,
Jiri Olsabe1eca32009-11-24 13:57:38 +01001249 .pipe_close = graph_trace_close,
Frederic Weisbecker6eaaa5d2009-02-11 02:25:00 +01001250 .wait_pipe = poll_wait_pipe,
Steven Rostedtef180122009-03-10 14:10:56 -04001251 .init = graph_trace_init,
1252 .reset = graph_trace_reset,
Frederic Weisbeckerdecbec32008-12-08 01:56:06 +01001253 .print_line = print_graph_function,
1254 .print_header = print_graph_headers,
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001255 .flags = &tracer_flags,
Frederic Weisbecker7447dce2009-02-07 21:33:57 +01001256#ifdef CONFIG_FTRACE_SELFTEST
1257 .selftest = trace_selftest_startup_function_graph,
1258#endif
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001259};
1260
1261static __init int init_graph_trace(void)
1262{
Lai Jiangshan0c9e6f62009-07-28 20:26:06 +08001263 max_bytes_for_cpu = snprintf(NULL, 0, "%d", nr_cpu_ids - 1);
1264
Jiri Olsa9106b692010-04-02 19:01:20 +02001265 if (!register_ftrace_event(&graph_trace_entry_event)) {
1266 pr_warning("Warning: could not register graph trace events\n");
1267 return 1;
1268 }
1269
1270 if (!register_ftrace_event(&graph_trace_ret_event)) {
1271 pr_warning("Warning: could not register graph trace events\n");
1272 return 1;
1273 }
1274
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001275 return register_tracer(&graph_trace);
1276}
1277
1278device_initcall(init_graph_trace);