blob: 7008d2e13cf2c0508235aeab12cc2630ef8bcb52 [file] [log] [blame]
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
Steven Rostedtb304d042010-09-14 18:58:33 -040018/* When set, irq functions will be ignored */
19static int ftrace_graph_skip_irqs;
20
Jiri Olsabe1eca32009-11-24 13:57:38 +010021struct fgraph_cpu_data {
Steven Rostedt2fbcdb32009-03-19 13:24:42 -040022 pid_t last_pid;
23 int depth;
Jiri Olsa2bd162122010-09-07 16:53:44 +020024 int depth_irq;
Jiri Olsabe1eca32009-11-24 13:57:38 +010025 int ignore;
Steven Rostedtf1c7f512010-02-26 17:08:16 -050026 unsigned long enter_funcs[FTRACE_RETFUNC_DEPTH];
Jiri Olsabe1eca32009-11-24 13:57:38 +010027};
28
29struct fgraph_data {
Namhyung Kim6016ee12010-08-11 12:47:59 +090030 struct fgraph_cpu_data __percpu *cpu_data;
Jiri Olsabe1eca32009-11-24 13:57:38 +010031
32 /* Place to preserve last processed entry. */
33 struct ftrace_graph_ent_entry ent;
34 struct ftrace_graph_ret_entry ret;
35 int failed;
36 int cpu;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -040037};
38
Frederic Weisbecker287b6e62008-11-26 00:57:25 +010039#define TRACE_GRAPH_INDENT 2
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010040
Frederic Weisbecker1a056152008-11-28 00:42:46 +010041/* Flag options */
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010042#define TRACE_GRAPH_PRINT_OVERRUN 0x1
Frederic Weisbecker1a056152008-11-28 00:42:46 +010043#define TRACE_GRAPH_PRINT_CPU 0x2
44#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +010045#define TRACE_GRAPH_PRINT_PROC 0x8
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -080046#define TRACE_GRAPH_PRINT_DURATION 0x10
Jiri Olsa9106b692010-04-02 19:01:20 +020047#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
Jiri Olsa2bd162122010-09-07 16:53:44 +020048#define TRACE_GRAPH_PRINT_IRQS 0x40
Frederic Weisbecker1a056152008-11-28 00:42:46 +010049
Steven Rostedt8741db52013-01-16 10:49:37 -050050static unsigned int max_depth;
51
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010052static struct tracer_opt trace_opts[] = {
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -080053 /* Display overruns? (for self-debug purpose) */
Frederic Weisbecker1a056152008-11-28 00:42:46 +010054 { TRACER_OPT(funcgraph-overrun, TRACE_GRAPH_PRINT_OVERRUN) },
55 /* Display CPU ? */
56 { TRACER_OPT(funcgraph-cpu, TRACE_GRAPH_PRINT_CPU) },
57 /* Display Overhead ? */
58 { TRACER_OPT(funcgraph-overhead, TRACE_GRAPH_PRINT_OVERHEAD) },
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +010059 /* Display proc name/pid */
60 { TRACER_OPT(funcgraph-proc, TRACE_GRAPH_PRINT_PROC) },
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -080061 /* Display duration of execution */
62 { TRACER_OPT(funcgraph-duration, TRACE_GRAPH_PRINT_DURATION) },
63 /* Display absolute time of an entry */
64 { TRACER_OPT(funcgraph-abstime, TRACE_GRAPH_PRINT_ABS_TIME) },
Jiri Olsa2bd162122010-09-07 16:53:44 +020065 /* Display interrupts */
66 { TRACER_OPT(funcgraph-irqs, TRACE_GRAPH_PRINT_IRQS) },
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010067 { } /* Empty entry */
68};
69
70static struct tracer_flags tracer_flags = {
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +010071 /* Don't display overruns and proc by default */
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -080072 .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD |
Jiri Olsa2bd162122010-09-07 16:53:44 +020073 TRACE_GRAPH_PRINT_DURATION | TRACE_GRAPH_PRINT_IRQS,
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010074 .opts = trace_opts
75};
76
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +020077static struct trace_array *graph_array;
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -080078
Jiri Olsaffeb80f2011-06-03 16:58:48 +020079/*
80 * DURATION column is being also used to display IRQ signs,
81 * following values are used by print_graph_irq and others
82 * to fill in space into DURATION column.
83 */
84enum {
85 DURATION_FILL_FULL = -1,
86 DURATION_FILL_START = -2,
87 DURATION_FILL_END = -3,
88};
89
90static enum print_line_t
91print_graph_duration(unsigned long long duration, struct trace_seq *s,
92 u32 flags);
Frederic Weisbeckerfb526072008-11-25 21:07:04 +010093
Steven Rostedt712406a2009-02-09 10:54:03 -080094/* Add a function return address to the trace stack on thread info.*/
95int
Steven Rostedt71e308a2009-06-18 12:45:08 -040096ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth,
97 unsigned long frame_pointer)
Steven Rostedt712406a2009-02-09 10:54:03 -080098{
Steven Rostedt5d1a03d2009-03-23 23:38:49 -040099 unsigned long long calltime;
Steven Rostedt712406a2009-02-09 10:54:03 -0800100 int index;
101
102 if (!current->ret_stack)
103 return -EBUSY;
104
Steven Rostedt82310a32009-06-02 12:26:07 -0400105 /*
106 * We must make sure the ret_stack is tested before we read
107 * anything else.
108 */
109 smp_rmb();
110
Steven Rostedt712406a2009-02-09 10:54:03 -0800111 /* The return trace stack is full */
112 if (current->curr_ret_stack == FTRACE_RETFUNC_DEPTH - 1) {
113 atomic_inc(&current->trace_overrun);
114 return -EBUSY;
115 }
116
Steven Rostedt5d1a03d2009-03-23 23:38:49 -0400117 calltime = trace_clock_local();
118
Steven Rostedt712406a2009-02-09 10:54:03 -0800119 index = ++current->curr_ret_stack;
120 barrier();
121 current->ret_stack[index].ret = ret;
122 current->ret_stack[index].func = func;
Steven Rostedt5d1a03d2009-03-23 23:38:49 -0400123 current->ret_stack[index].calltime = calltime;
Steven Rostedta2a16d62009-03-24 23:17:58 -0400124 current->ret_stack[index].subtime = 0;
Steven Rostedt71e308a2009-06-18 12:45:08 -0400125 current->ret_stack[index].fp = frame_pointer;
Steven Rostedt712406a2009-02-09 10:54:03 -0800126 *depth = index;
127
128 return 0;
129}
130
131/* Retrieve a function return address to the trace stack on thread info.*/
Steven Rostedta2a16d62009-03-24 23:17:58 -0400132static void
Steven Rostedt71e308a2009-06-18 12:45:08 -0400133ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret,
134 unsigned long frame_pointer)
Steven Rostedt712406a2009-02-09 10:54:03 -0800135{
136 int index;
137
138 index = current->curr_ret_stack;
139
140 if (unlikely(index < 0)) {
141 ftrace_graph_stop();
142 WARN_ON(1);
143 /* Might as well panic, otherwise we have no where to go */
144 *ret = (unsigned long)panic;
145 return;
146 }
147
Steven Rostedt781d0622011-02-09 13:27:22 -0500148#if defined(CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST) && !defined(CC_USING_FENTRY)
Steven Rostedt71e308a2009-06-18 12:45:08 -0400149 /*
150 * The arch may choose to record the frame pointer used
151 * and check it here to make sure that it is what we expect it
152 * to be. If gcc does not set the place holder of the return
153 * address in the frame pointer, and does a copy instead, then
154 * the function graph trace will fail. This test detects this
155 * case.
156 *
157 * Currently, x86_32 with optimize for size (-Os) makes the latest
158 * gcc do the above.
Steven Rostedt781d0622011-02-09 13:27:22 -0500159 *
160 * Note, -mfentry does not use frame pointers, and this test
161 * is not needed if CC_USING_FENTRY is set.
Steven Rostedt71e308a2009-06-18 12:45:08 -0400162 */
163 if (unlikely(current->ret_stack[index].fp != frame_pointer)) {
164 ftrace_graph_stop();
165 WARN(1, "Bad frame pointer: expected %lx, received %lx\n"
Steven Rostedtb375a112009-09-17 00:05:58 -0400166 " from func %ps return to %lx\n",
Steven Rostedt71e308a2009-06-18 12:45:08 -0400167 current->ret_stack[index].fp,
168 frame_pointer,
169 (void *)current->ret_stack[index].func,
170 current->ret_stack[index].ret);
171 *ret = (unsigned long)panic;
172 return;
173 }
174#endif
175
Steven Rostedt712406a2009-02-09 10:54:03 -0800176 *ret = current->ret_stack[index].ret;
177 trace->func = current->ret_stack[index].func;
178 trace->calltime = current->ret_stack[index].calltime;
179 trace->overrun = atomic_read(&current->trace_overrun);
180 trace->depth = index;
Steven Rostedt712406a2009-02-09 10:54:03 -0800181}
182
183/*
184 * Send the trace to the ring-buffer.
185 * @return the original return address.
186 */
Steven Rostedt71e308a2009-06-18 12:45:08 -0400187unsigned long ftrace_return_to_handler(unsigned long frame_pointer)
Steven Rostedt712406a2009-02-09 10:54:03 -0800188{
189 struct ftrace_graph_ret trace;
190 unsigned long ret;
191
Steven Rostedt71e308a2009-06-18 12:45:08 -0400192 ftrace_pop_return_trace(&trace, &ret, frame_pointer);
Frederic Weisbecker00126932009-03-05 01:49:22 +0100193 trace.rettime = trace_clock_local();
Steven Rostedt712406a2009-02-09 10:54:03 -0800194 ftrace_graph_return(&trace);
Steven Rostedta2a16d62009-03-24 23:17:58 -0400195 barrier();
196 current->curr_ret_stack--;
Steven Rostedt712406a2009-02-09 10:54:03 -0800197
198 if (unlikely(!ret)) {
199 ftrace_graph_stop();
200 WARN_ON(1);
201 /* Might as well panic. What else to do? */
202 ret = (unsigned long)panic;
203 }
204
205 return ret;
206}
207
Jiri Olsa62b915f2010-04-02 19:01:22 +0200208int __trace_graph_entry(struct trace_array *tr,
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200209 struct ftrace_graph_ent *trace,
210 unsigned long flags,
211 int pc)
212{
213 struct ftrace_event_call *call = &event_funcgraph_entry;
214 struct ring_buffer_event *event;
Steven Rostedte77405a2009-09-02 14:17:06 -0400215 struct ring_buffer *buffer = tr->buffer;
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200216 struct ftrace_graph_ent_entry *entry;
217
Rusty Russelldd17c8f2009-10-29 22:34:15 +0900218 if (unlikely(__this_cpu_read(ftrace_cpu_disabled)))
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200219 return 0;
220
Steven Rostedte77405a2009-09-02 14:17:06 -0400221 event = trace_buffer_lock_reserve(buffer, TRACE_GRAPH_ENT,
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200222 sizeof(*entry), flags, pc);
223 if (!event)
224 return 0;
225 entry = ring_buffer_event_data(event);
226 entry->graph_ent = *trace;
Steven Rostedte77405a2009-09-02 14:17:06 -0400227 if (!filter_current_check_discard(buffer, call, entry, event))
Steven Rostedt7ffbd482012-10-11 12:14:25 -0400228 __buffer_unlock_commit(buffer, event);
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200229
230 return 1;
231}
232
Steven Rostedtb304d042010-09-14 18:58:33 -0400233static inline int ftrace_graph_ignore_irqs(void)
234{
Steven Rostedte4a3f542011-06-14 19:02:29 -0400235 if (!ftrace_graph_skip_irqs || trace_recursion_test(TRACE_IRQ_BIT))
Steven Rostedtb304d042010-09-14 18:58:33 -0400236 return 0;
237
238 return in_irq();
239}
240
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200241int trace_graph_entry(struct ftrace_graph_ent *trace)
242{
243 struct trace_array *tr = graph_array;
244 struct trace_array_cpu *data;
245 unsigned long flags;
246 long disabled;
247 int ret;
248 int cpu;
249 int pc;
250
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200251 if (!ftrace_trace_task(current))
252 return 0;
253
Lai Jiangshanea2c68a2010-01-13 19:38:30 +0800254 /* trace it when it is-nested-in or is a function enabled. */
Steven Rostedt8741db52013-01-16 10:49:37 -0500255 if ((!(trace->depth || ftrace_graph_addr(trace->func)) ||
256 ftrace_graph_ignore_irqs()) ||
257 (max_depth && trace->depth >= max_depth))
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200258 return 0;
259
260 local_irq_save(flags);
261 cpu = raw_smp_processor_id();
262 data = tr->data[cpu];
263 disabled = atomic_inc_return(&data->disabled);
264 if (likely(disabled == 1)) {
265 pc = preempt_count();
266 ret = __trace_graph_entry(tr, trace, flags, pc);
267 } else {
268 ret = 0;
269 }
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200270
271 atomic_dec(&data->disabled);
272 local_irq_restore(flags);
273
274 return ret;
275}
276
Tim Bird0e950172010-02-25 15:36:43 -0800277int trace_graph_thresh_entry(struct ftrace_graph_ent *trace)
278{
279 if (tracing_thresh)
280 return 1;
281 else
282 return trace_graph_entry(trace);
283}
284
Jiri Olsa0a772622010-09-23 14:00:52 +0200285static void
286__trace_graph_function(struct trace_array *tr,
287 unsigned long ip, unsigned long flags, int pc)
288{
289 u64 time = trace_clock_local();
290 struct ftrace_graph_ent ent = {
291 .func = ip,
292 .depth = 0,
293 };
294 struct ftrace_graph_ret ret = {
295 .func = ip,
296 .depth = 0,
297 .calltime = time,
298 .rettime = time,
299 };
300
301 __trace_graph_entry(tr, &ent, flags, pc);
302 __trace_graph_return(tr, &ret, flags, pc);
303}
304
305void
306trace_graph_function(struct trace_array *tr,
307 unsigned long ip, unsigned long parent_ip,
308 unsigned long flags, int pc)
309{
Jiri Olsa0a772622010-09-23 14:00:52 +0200310 __trace_graph_function(tr, ip, flags, pc);
311}
312
Jiri Olsa62b915f2010-04-02 19:01:22 +0200313void __trace_graph_return(struct trace_array *tr,
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200314 struct ftrace_graph_ret *trace,
315 unsigned long flags,
316 int pc)
317{
318 struct ftrace_event_call *call = &event_funcgraph_exit;
319 struct ring_buffer_event *event;
Steven Rostedte77405a2009-09-02 14:17:06 -0400320 struct ring_buffer *buffer = tr->buffer;
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200321 struct ftrace_graph_ret_entry *entry;
322
Rusty Russelldd17c8f2009-10-29 22:34:15 +0900323 if (unlikely(__this_cpu_read(ftrace_cpu_disabled)))
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200324 return;
325
Steven Rostedte77405a2009-09-02 14:17:06 -0400326 event = trace_buffer_lock_reserve(buffer, TRACE_GRAPH_RET,
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200327 sizeof(*entry), flags, pc);
328 if (!event)
329 return;
330 entry = ring_buffer_event_data(event);
331 entry->ret = *trace;
Steven Rostedte77405a2009-09-02 14:17:06 -0400332 if (!filter_current_check_discard(buffer, call, entry, event))
Steven Rostedt7ffbd482012-10-11 12:14:25 -0400333 __buffer_unlock_commit(buffer, event);
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200334}
335
336void trace_graph_return(struct ftrace_graph_ret *trace)
337{
338 struct trace_array *tr = graph_array;
339 struct trace_array_cpu *data;
340 unsigned long flags;
341 long disabled;
342 int cpu;
343 int pc;
344
345 local_irq_save(flags);
346 cpu = raw_smp_processor_id();
347 data = tr->data[cpu];
348 disabled = atomic_inc_return(&data->disabled);
349 if (likely(disabled == 1)) {
350 pc = preempt_count();
351 __trace_graph_return(tr, trace, flags, pc);
352 }
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200353 atomic_dec(&data->disabled);
354 local_irq_restore(flags);
355}
356
Frederic Weisbecker24a53652010-01-14 08:23:15 +0100357void set_graph_array(struct trace_array *tr)
358{
359 graph_array = tr;
360
361 /* Make graph_array visible before we start tracing */
362
363 smp_mb();
364}
365
Tim Bird0e950172010-02-25 15:36:43 -0800366void trace_graph_thresh_return(struct ftrace_graph_ret *trace)
367{
368 if (tracing_thresh &&
369 (trace->rettime - trace->calltime < tracing_thresh))
370 return;
371 else
372 trace_graph_return(trace);
373}
374
Frederic Weisbeckerfb526072008-11-25 21:07:04 +0100375static int graph_trace_init(struct trace_array *tr)
376{
Frederic Weisbecker1a0799a2009-07-29 18:59:58 +0200377 int ret;
378
Frederic Weisbecker24a53652010-01-14 08:23:15 +0100379 set_graph_array(tr);
Tim Bird0e950172010-02-25 15:36:43 -0800380 if (tracing_thresh)
381 ret = register_ftrace_graph(&trace_graph_thresh_return,
382 &trace_graph_thresh_entry);
383 else
384 ret = register_ftrace_graph(&trace_graph_return,
385 &trace_graph_entry);
Steven Rostedt660c7f92008-11-26 00:16:26 -0500386 if (ret)
387 return ret;
388 tracing_start_cmdline_record();
389
390 return 0;
Frederic Weisbeckerfb526072008-11-25 21:07:04 +0100391}
392
393static void graph_trace_reset(struct trace_array *tr)
394{
Steven Rostedt660c7f92008-11-26 00:16:26 -0500395 tracing_stop_cmdline_record();
396 unregister_ftrace_graph();
Frederic Weisbeckerfb526072008-11-25 21:07:04 +0100397}
398
Lai Jiangshan0c9e6f62009-07-28 20:26:06 +0800399static int max_bytes_for_cpu;
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100400
401static enum print_line_t
402print_graph_cpu(struct trace_seq *s, int cpu)
403{
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100404 int ret;
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100405
Ingo Molnard51090b2008-11-28 09:55:16 +0100406 /*
407 * Start with a space character - to make it stand out
408 * to the right a bit when trace output is pasted into
409 * email:
410 */
Lai Jiangshan0c9e6f62009-07-28 20:26:06 +0800411 ret = trace_seq_printf(s, " %*d) ", max_bytes_for_cpu, cpu);
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100412 if (!ret)
Ingo Molnard51090b2008-11-28 09:55:16 +0100413 return TRACE_TYPE_PARTIAL_LINE;
414
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100415 return TRACE_TYPE_HANDLED;
416}
417
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100418#define TRACE_GRAPH_PROCINFO_LENGTH 14
419
420static enum print_line_t
421print_graph_proc(struct trace_seq *s, pid_t pid)
422{
Steven Rostedt4ca53082009-03-16 19:20:15 -0400423 char comm[TASK_COMM_LEN];
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100424 /* sign + log10(MAX_INT) + '\0' */
425 char pid_str[11];
Steven Rostedt4ca53082009-03-16 19:20:15 -0400426 int spaces = 0;
427 int ret;
428 int len;
429 int i;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100430
Steven Rostedt4ca53082009-03-16 19:20:15 -0400431 trace_find_cmdline(pid, comm);
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100432 comm[7] = '\0';
433 sprintf(pid_str, "%d", pid);
434
435 /* 1 stands for the "-" character */
436 len = strlen(comm) + strlen(pid_str) + 1;
437
438 if (len < TRACE_GRAPH_PROCINFO_LENGTH)
439 spaces = TRACE_GRAPH_PROCINFO_LENGTH - len;
440
441 /* First spaces to align center */
442 for (i = 0; i < spaces / 2; i++) {
443 ret = trace_seq_printf(s, " ");
444 if (!ret)
445 return TRACE_TYPE_PARTIAL_LINE;
446 }
447
448 ret = trace_seq_printf(s, "%s-%s", comm, pid_str);
449 if (!ret)
450 return TRACE_TYPE_PARTIAL_LINE;
451
452 /* Last spaces to align center */
453 for (i = 0; i < spaces - (spaces / 2); i++) {
454 ret = trace_seq_printf(s, " ");
455 if (!ret)
456 return TRACE_TYPE_PARTIAL_LINE;
457 }
458 return TRACE_TYPE_HANDLED;
459}
460
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100461
Steven Rostedt49ff5902009-09-11 00:30:26 -0400462static enum print_line_t
463print_graph_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
464{
Steven Rostedtf81c9722009-09-11 14:24:13 -0400465 if (!trace_seq_putc(s, ' '))
Steven Rostedt49ff5902009-09-11 00:30:26 -0400466 return 0;
467
Steven Rostedtf81c9722009-09-11 14:24:13 -0400468 return trace_print_lat_fmt(s, entry);
Steven Rostedt49ff5902009-09-11 00:30:26 -0400469}
470
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100471/* If the pid changed since the last trace, output this event */
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100472static enum print_line_t
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400473verif_pid(struct trace_seq *s, pid_t pid, int cpu, struct fgraph_data *data)
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100474{
Ingo Molnard51090b2008-11-28 09:55:16 +0100475 pid_t prev_pid;
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800476 pid_t *last_pid;
Ingo Molnard51090b2008-11-28 09:55:16 +0100477 int ret;
Steven Rostedt660c7f92008-11-26 00:16:26 -0500478
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400479 if (!data)
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100480 return TRACE_TYPE_HANDLED;
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100481
Jiri Olsabe1eca32009-11-24 13:57:38 +0100482 last_pid = &(per_cpu_ptr(data->cpu_data, cpu)->last_pid);
Steven Rostedt660c7f92008-11-26 00:16:26 -0500483
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800484 if (*last_pid == pid)
485 return TRACE_TYPE_HANDLED;
486
487 prev_pid = *last_pid;
488 *last_pid = pid;
489
490 if (prev_pid == -1)
491 return TRACE_TYPE_HANDLED;
Ingo Molnard51090b2008-11-28 09:55:16 +0100492/*
493 * Context-switch trace line:
494
495 ------------------------------------------
496 | 1) migration/0--1 => sshd-1755
497 ------------------------------------------
498
499 */
500 ret = trace_seq_printf(s,
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +0100501 " ------------------------------------------\n");
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100502 if (!ret)
Wenji Huang810dc732009-02-10 01:03:05 -0500503 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100504
505 ret = print_graph_cpu(s, cpu);
506 if (ret == TRACE_TYPE_PARTIAL_LINE)
Wenji Huang810dc732009-02-10 01:03:05 -0500507 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100508
509 ret = print_graph_proc(s, prev_pid);
510 if (ret == TRACE_TYPE_PARTIAL_LINE)
Wenji Huang810dc732009-02-10 01:03:05 -0500511 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100512
513 ret = trace_seq_printf(s, " => ");
514 if (!ret)
Wenji Huang810dc732009-02-10 01:03:05 -0500515 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100516
517 ret = print_graph_proc(s, pid);
518 if (ret == TRACE_TYPE_PARTIAL_LINE)
Wenji Huang810dc732009-02-10 01:03:05 -0500519 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100520
521 ret = trace_seq_printf(s,
522 "\n ------------------------------------------\n\n");
523 if (!ret)
Wenji Huang810dc732009-02-10 01:03:05 -0500524 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100525
Wenji Huang810dc732009-02-10 01:03:05 -0500526 return TRACE_TYPE_HANDLED;
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100527}
528
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100529static struct ftrace_graph_ret_entry *
530get_return_for_leaf(struct trace_iterator *iter,
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100531 struct ftrace_graph_ent_entry *curr)
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100532{
Jiri Olsabe1eca32009-11-24 13:57:38 +0100533 struct fgraph_data *data = iter->private;
534 struct ring_buffer_iter *ring_iter = NULL;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100535 struct ring_buffer_event *event;
536 struct ftrace_graph_ret_entry *next;
537
Jiri Olsabe1eca32009-11-24 13:57:38 +0100538 /*
539 * If the previous output failed to write to the seq buffer,
540 * then we just reuse the data from before.
541 */
542 if (data && data->failed) {
543 curr = &data->ent;
544 next = &data->ret;
545 } else {
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100546
Steven Rostedt6d158a82012-06-27 20:46:14 -0400547 ring_iter = trace_buffer_iter(iter, iter->cpu);
Jiri Olsabe1eca32009-11-24 13:57:38 +0100548
549 /* First peek to compare current entry and the next one */
550 if (ring_iter)
551 event = ring_buffer_iter_peek(ring_iter, NULL);
552 else {
553 /*
554 * We need to consume the current entry to see
555 * the next one.
556 */
Steven Rostedt66a8cb92010-03-31 13:21:56 -0400557 ring_buffer_consume(iter->tr->buffer, iter->cpu,
558 NULL, NULL);
Jiri Olsabe1eca32009-11-24 13:57:38 +0100559 event = ring_buffer_peek(iter->tr->buffer, iter->cpu,
Steven Rostedt66a8cb92010-03-31 13:21:56 -0400560 NULL, NULL);
Jiri Olsabe1eca32009-11-24 13:57:38 +0100561 }
562
563 if (!event)
564 return NULL;
565
566 next = ring_buffer_event_data(event);
567
568 if (data) {
569 /*
570 * Save current and next entries for later reference
571 * if the output fails.
572 */
573 data->ent = *curr;
Shaohua Li575570f2010-07-27 16:06:34 +0800574 /*
575 * If the next event is not a return type, then
576 * we only care about what type it is. Otherwise we can
577 * safely copy the entire event.
578 */
579 if (next->ent.type == TRACE_GRAPH_RET)
580 data->ret = *next;
581 else
582 data->ret.ent.type = next->ent.type;
Jiri Olsabe1eca32009-11-24 13:57:38 +0100583 }
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100584 }
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100585
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100586 if (next->ent.type != TRACE_GRAPH_RET)
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100587 return NULL;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100588
589 if (curr->ent.pid != next->ent.pid ||
590 curr->graph_ent.func != next->ret.func)
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100591 return NULL;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100592
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100593 /* this is a leaf, now advance the iterator */
594 if (ring_iter)
595 ring_buffer_read(ring_iter, NULL);
596
597 return next;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100598}
599
Frederic Weisbeckerd1f9cbd2009-02-18 04:25:25 +0100600static int print_graph_abs_time(u64 t, struct trace_seq *s)
601{
602 unsigned long usecs_rem;
603
604 usecs_rem = do_div(t, NSEC_PER_SEC);
605 usecs_rem /= 1000;
606
607 return trace_seq_printf(s, "%5lu.%06lu | ",
608 (unsigned long)t, usecs_rem);
609}
610
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100611static enum print_line_t
Frederic Weisbeckerd1f9cbd2009-02-18 04:25:25 +0100612print_graph_irq(struct trace_iterator *iter, unsigned long addr,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200613 enum trace_type type, int cpu, pid_t pid, u32 flags)
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100614{
615 int ret;
Frederic Weisbeckerd1f9cbd2009-02-18 04:25:25 +0100616 struct trace_seq *s = &iter->seq;
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100617
618 if (addr < (unsigned long)__irqentry_text_start ||
619 addr >= (unsigned long)__irqentry_text_end)
620 return TRACE_TYPE_UNHANDLED;
621
Jiri Olsa749230b2011-06-03 16:58:51 +0200622 if (trace_flags & TRACE_ITER_CONTEXT_INFO) {
623 /* Absolute time */
624 if (flags & TRACE_GRAPH_PRINT_ABS_TIME) {
625 ret = print_graph_abs_time(iter->ts, s);
626 if (!ret)
627 return TRACE_TYPE_PARTIAL_LINE;
628 }
Frederic Weisbeckerd1f9cbd2009-02-18 04:25:25 +0100629
Jiri Olsa749230b2011-06-03 16:58:51 +0200630 /* Cpu */
631 if (flags & TRACE_GRAPH_PRINT_CPU) {
632 ret = print_graph_cpu(s, cpu);
633 if (ret == TRACE_TYPE_PARTIAL_LINE)
634 return TRACE_TYPE_PARTIAL_LINE;
635 }
Steven Rostedt49ff5902009-09-11 00:30:26 -0400636
Jiri Olsa749230b2011-06-03 16:58:51 +0200637 /* Proc */
638 if (flags & TRACE_GRAPH_PRINT_PROC) {
639 ret = print_graph_proc(s, pid);
640 if (ret == TRACE_TYPE_PARTIAL_LINE)
641 return TRACE_TYPE_PARTIAL_LINE;
642 ret = trace_seq_printf(s, " | ");
643 if (!ret)
644 return TRACE_TYPE_PARTIAL_LINE;
645 }
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800646 }
647
648 /* No overhead */
Jiri Olsaffeb80f2011-06-03 16:58:48 +0200649 ret = print_graph_duration(DURATION_FILL_START, s, flags);
650 if (ret != TRACE_TYPE_HANDLED)
651 return ret;
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800652
653 if (type == TRACE_GRAPH_ENT)
654 ret = trace_seq_printf(s, "==========>");
655 else
656 ret = trace_seq_printf(s, "<==========");
657
658 if (!ret)
659 return TRACE_TYPE_PARTIAL_LINE;
660
Jiri Olsaffeb80f2011-06-03 16:58:48 +0200661 ret = print_graph_duration(DURATION_FILL_END, s, flags);
662 if (ret != TRACE_TYPE_HANDLED)
663 return ret;
664
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800665 ret = trace_seq_printf(s, "\n");
666
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100667 if (!ret)
668 return TRACE_TYPE_PARTIAL_LINE;
669 return TRACE_TYPE_HANDLED;
670}
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100671
Steven Rostedt0706f1c2009-03-23 23:12:58 -0400672enum print_line_t
673trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100674{
675 unsigned long nsecs_rem = do_div(duration, 1000);
Frederic Weisbecker166d3c72008-12-03 02:32:12 +0100676 /* log10(ULONG_MAX) + '\0' */
677 char msecs_str[21];
678 char nsecs_str[5];
679 int ret, len;
680 int i;
681
682 sprintf(msecs_str, "%lu", (unsigned long) duration);
683
684 /* Print msecs */
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800685 ret = trace_seq_printf(s, "%s", msecs_str);
Frederic Weisbecker166d3c72008-12-03 02:32:12 +0100686 if (!ret)
687 return TRACE_TYPE_PARTIAL_LINE;
688
689 len = strlen(msecs_str);
690
691 /* Print nsecs (we don't want to exceed 7 numbers) */
692 if (len < 7) {
Borislav Petkov14cae9b2010-09-29 10:08:23 +0200693 size_t slen = min_t(size_t, sizeof(nsecs_str), 8UL - len);
694
695 snprintf(nsecs_str, slen, "%03lu", nsecs_rem);
Frederic Weisbecker166d3c72008-12-03 02:32:12 +0100696 ret = trace_seq_printf(s, ".%s", nsecs_str);
697 if (!ret)
698 return TRACE_TYPE_PARTIAL_LINE;
699 len += strlen(nsecs_str);
700 }
701
702 ret = trace_seq_printf(s, " us ");
703 if (!ret)
704 return TRACE_TYPE_PARTIAL_LINE;
705
706 /* Print remaining spaces to fit the row's width */
707 for (i = len; i < 7; i++) {
708 ret = trace_seq_printf(s, " ");
709 if (!ret)
710 return TRACE_TYPE_PARTIAL_LINE;
711 }
Steven Rostedt0706f1c2009-03-23 23:12:58 -0400712 return TRACE_TYPE_HANDLED;
713}
714
715static enum print_line_t
Jiri Olsaffeb80f2011-06-03 16:58:48 +0200716print_graph_duration(unsigned long long duration, struct trace_seq *s,
717 u32 flags)
Steven Rostedt0706f1c2009-03-23 23:12:58 -0400718{
Jiri Olsaffeb80f2011-06-03 16:58:48 +0200719 int ret = -1;
720
Jiri Olsa749230b2011-06-03 16:58:51 +0200721 if (!(flags & TRACE_GRAPH_PRINT_DURATION) ||
722 !(trace_flags & TRACE_ITER_CONTEXT_INFO))
723 return TRACE_TYPE_HANDLED;
Jiri Olsaffeb80f2011-06-03 16:58:48 +0200724
725 /* No real adata, just filling the column with spaces */
726 switch (duration) {
727 case DURATION_FILL_FULL:
728 ret = trace_seq_printf(s, " | ");
729 return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
730 case DURATION_FILL_START:
731 ret = trace_seq_printf(s, " ");
732 return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
733 case DURATION_FILL_END:
734 ret = trace_seq_printf(s, " |");
735 return ret ? TRACE_TYPE_HANDLED : TRACE_TYPE_PARTIAL_LINE;
736 }
737
738 /* Signal a overhead of time execution to the output */
739 if (flags & TRACE_GRAPH_PRINT_OVERHEAD) {
740 /* Duration exceeded 100 msecs */
741 if (duration > 100000ULL)
742 ret = trace_seq_printf(s, "! ");
743 /* Duration exceeded 10 msecs */
744 else if (duration > 10000ULL)
745 ret = trace_seq_printf(s, "+ ");
746 }
747
748 /*
749 * The -1 means we either did not exceed the duration tresholds
750 * or we dont want to print out the overhead. Either way we need
751 * to fill out the space.
752 */
753 if (ret == -1)
754 ret = trace_seq_printf(s, " ");
755
756 /* Catching here any failure happenned above */
757 if (!ret)
758 return TRACE_TYPE_PARTIAL_LINE;
Steven Rostedt0706f1c2009-03-23 23:12:58 -0400759
760 ret = trace_print_graph_duration(duration, s);
761 if (ret != TRACE_TYPE_HANDLED)
762 return ret;
Frederic Weisbecker166d3c72008-12-03 02:32:12 +0100763
764 ret = trace_seq_printf(s, "| ");
765 if (!ret)
766 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker166d3c72008-12-03 02:32:12 +0100767
Steven Rostedt0706f1c2009-03-23 23:12:58 -0400768 return TRACE_TYPE_HANDLED;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100769}
770
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100771/* Case of a leaf function on its call entry */
772static enum print_line_t
773print_graph_entry_leaf(struct trace_iterator *iter,
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100774 struct ftrace_graph_ent_entry *entry,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200775 struct ftrace_graph_ret_entry *ret_entry,
776 struct trace_seq *s, u32 flags)
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100777{
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400778 struct fgraph_data *data = iter->private;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100779 struct ftrace_graph_ret *graph_ret;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100780 struct ftrace_graph_ent *call;
781 unsigned long long duration;
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100782 int ret;
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100783 int i;
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100784
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100785 graph_ret = &ret_entry->ret;
786 call = &entry->graph_ent;
787 duration = graph_ret->rettime - graph_ret->calltime;
Steven Rostedt437f24fb2008-11-26 00:16:27 -0500788
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400789 if (data) {
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500790 struct fgraph_cpu_data *cpu_data;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400791 int cpu = iter->cpu;
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500792
793 cpu_data = per_cpu_ptr(data->cpu_data, cpu);
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400794
795 /*
796 * Comments display at + 1 to depth. Since
797 * this is a leaf function, keep the comments
798 * equal to this depth.
799 */
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500800 cpu_data->depth = call->depth - 1;
801
802 /* No need to keep this function around for this depth */
803 if (call->depth < FTRACE_RETFUNC_DEPTH)
804 cpu_data->enter_funcs[call->depth] = 0;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400805 }
806
Jiri Olsaffeb80f2011-06-03 16:58:48 +0200807 /* Overhead and duration */
808 ret = print_graph_duration(duration, s, flags);
809 if (ret == TRACE_TYPE_PARTIAL_LINE)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800810 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100811
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100812 /* Function */
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100813 for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
814 ret = trace_seq_printf(s, " ");
815 if (!ret)
816 return TRACE_TYPE_PARTIAL_LINE;
817 }
818
Steven Rostedtb375a112009-09-17 00:05:58 -0400819 ret = trace_seq_printf(s, "%ps();\n", (void *)call->func);
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100820 if (!ret)
821 return TRACE_TYPE_PARTIAL_LINE;
822
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100823 return TRACE_TYPE_HANDLED;
824}
825
826static enum print_line_t
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400827print_graph_entry_nested(struct trace_iterator *iter,
828 struct ftrace_graph_ent_entry *entry,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200829 struct trace_seq *s, int cpu, u32 flags)
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100830{
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100831 struct ftrace_graph_ent *call = &entry->graph_ent;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400832 struct fgraph_data *data = iter->private;
833 int ret;
834 int i;
835
836 if (data) {
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500837 struct fgraph_cpu_data *cpu_data;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400838 int cpu = iter->cpu;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400839
Steven Rostedtf1c7f512010-02-26 17:08:16 -0500840 cpu_data = per_cpu_ptr(data->cpu_data, cpu);
841 cpu_data->depth = call->depth;
842
843 /* Save this function pointer to see if the exit matches */
844 if (call->depth < FTRACE_RETFUNC_DEPTH)
845 cpu_data->enter_funcs[call->depth] = call->func;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400846 }
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100847
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800848 /* No time */
Jiri Olsaffeb80f2011-06-03 16:58:48 +0200849 ret = print_graph_duration(DURATION_FILL_FULL, s, flags);
850 if (ret != TRACE_TYPE_HANDLED)
851 return ret;
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +0100852
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100853 /* Function */
854 for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
855 ret = trace_seq_printf(s, " ");
856 if (!ret)
857 return TRACE_TYPE_PARTIAL_LINE;
858 }
859
Steven Rostedtb375a112009-09-17 00:05:58 -0400860 ret = trace_seq_printf(s, "%ps() {\n", (void *)call->func);
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100861 if (!ret)
862 return TRACE_TYPE_PARTIAL_LINE;
863
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +0100864 /*
865 * we already consumed the current entry to check the next one
866 * and see if this is a leaf.
867 */
868 return TRACE_TYPE_NO_CONSUME;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100869}
870
871static enum print_line_t
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400872print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200873 int type, unsigned long addr, u32 flags)
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100874{
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400875 struct fgraph_data *data = iter->private;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +0100876 struct trace_entry *ent = iter->ent;
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400877 int cpu = iter->cpu;
878 int ret;
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100879
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100880 /* Pid */
Steven Rostedt2fbcdb32009-03-19 13:24:42 -0400881 if (verif_pid(s, ent->pid, cpu, data) == TRACE_TYPE_PARTIAL_LINE)
Steven Rostedt437f24fb2008-11-26 00:16:27 -0500882 return TRACE_TYPE_PARTIAL_LINE;
883
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400884 if (type) {
885 /* Interrupt */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200886 ret = print_graph_irq(iter, addr, type, cpu, ent->pid, flags);
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400887 if (ret == TRACE_TYPE_PARTIAL_LINE)
888 return TRACE_TYPE_PARTIAL_LINE;
889 }
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800890
Jiri Olsa749230b2011-06-03 16:58:51 +0200891 if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
892 return 0;
893
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800894 /* Absolute time */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200895 if (flags & TRACE_GRAPH_PRINT_ABS_TIME) {
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -0800896 ret = print_graph_abs_time(iter->ts, s);
897 if (!ret)
898 return TRACE_TYPE_PARTIAL_LINE;
899 }
900
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100901 /* Cpu */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200902 if (flags & TRACE_GRAPH_PRINT_CPU) {
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100903 ret = print_graph_cpu(s, cpu);
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100904 if (ret == TRACE_TYPE_PARTIAL_LINE)
905 return TRACE_TYPE_PARTIAL_LINE;
906 }
907
908 /* Proc */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +0200909 if (flags & TRACE_GRAPH_PRINT_PROC) {
Ingo Molnar00a8bf82009-02-19 13:01:37 +0100910 ret = print_graph_proc(s, ent->pid);
Frederic Weisbecker11e84ac2008-12-03 02:30:37 +0100911 if (ret == TRACE_TYPE_PARTIAL_LINE)
912 return TRACE_TYPE_PARTIAL_LINE;
913
914 ret = trace_seq_printf(s, " | ");
Frederic Weisbecker1a056152008-11-28 00:42:46 +0100915 if (!ret)
916 return TRACE_TYPE_PARTIAL_LINE;
917 }
Frederic Weisbecker287b6e62008-11-26 00:57:25 +0100918
Steven Rostedt49ff5902009-09-11 00:30:26 -0400919 /* Latency format */
920 if (trace_flags & TRACE_ITER_LATENCY_FMT) {
921 ret = print_graph_lat_fmt(s, ent);
922 if (ret == TRACE_TYPE_PARTIAL_LINE)
923 return TRACE_TYPE_PARTIAL_LINE;
924 }
925
Steven Rostedtac5f6c92009-03-19 11:29:23 -0400926 return 0;
927}
928
Jiri Olsa2bd162122010-09-07 16:53:44 +0200929/*
930 * Entry check for irq code
931 *
932 * returns 1 if
933 * - we are inside irq code
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300934 * - we just entered irq code
Jiri Olsa2bd162122010-09-07 16:53:44 +0200935 *
936 * retunns 0 if
937 * - funcgraph-interrupts option is set
938 * - we are not inside irq code
939 */
940static int
941check_irq_entry(struct trace_iterator *iter, u32 flags,
942 unsigned long addr, int depth)
943{
944 int cpu = iter->cpu;
Jiri Olsaa9d61172010-09-24 17:41:02 +0200945 int *depth_irq;
Jiri Olsa2bd162122010-09-07 16:53:44 +0200946 struct fgraph_data *data = iter->private;
Jiri Olsa2bd162122010-09-07 16:53:44 +0200947
Jiri Olsaa9d61172010-09-24 17:41:02 +0200948 /*
949 * If we are either displaying irqs, or we got called as
950 * a graph event and private data does not exist,
951 * then we bypass the irq check.
952 */
953 if ((flags & TRACE_GRAPH_PRINT_IRQS) ||
954 (!data))
Jiri Olsa2bd162122010-09-07 16:53:44 +0200955 return 0;
956
Jiri Olsaa9d61172010-09-24 17:41:02 +0200957 depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
958
Jiri Olsa2bd162122010-09-07 16:53:44 +0200959 /*
960 * We are inside the irq code
961 */
962 if (*depth_irq >= 0)
963 return 1;
964
965 if ((addr < (unsigned long)__irqentry_text_start) ||
966 (addr >= (unsigned long)__irqentry_text_end))
967 return 0;
968
969 /*
970 * We are entering irq code.
971 */
972 *depth_irq = depth;
973 return 1;
974}
975
976/*
977 * Return check for irq code
978 *
979 * returns 1 if
980 * - we are inside irq code
981 * - we just left irq code
982 *
983 * returns 0 if
984 * - funcgraph-interrupts option is set
985 * - we are not inside irq code
986 */
987static int
988check_irq_return(struct trace_iterator *iter, u32 flags, int depth)
989{
990 int cpu = iter->cpu;
Jiri Olsaa9d61172010-09-24 17:41:02 +0200991 int *depth_irq;
Jiri Olsa2bd162122010-09-07 16:53:44 +0200992 struct fgraph_data *data = iter->private;
Jiri Olsa2bd162122010-09-07 16:53:44 +0200993
Jiri Olsaa9d61172010-09-24 17:41:02 +0200994 /*
995 * If we are either displaying irqs, or we got called as
996 * a graph event and private data does not exist,
997 * then we bypass the irq check.
998 */
999 if ((flags & TRACE_GRAPH_PRINT_IRQS) ||
1000 (!data))
Jiri Olsa2bd162122010-09-07 16:53:44 +02001001 return 0;
1002
Jiri Olsaa9d61172010-09-24 17:41:02 +02001003 depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
1004
Jiri Olsa2bd162122010-09-07 16:53:44 +02001005 /*
1006 * We are not inside the irq code.
1007 */
1008 if (*depth_irq == -1)
1009 return 0;
1010
1011 /*
1012 * We are inside the irq code, and this is returning entry.
1013 * Let's not trace it and clear the entry depth, since
1014 * we are out of irq code.
1015 *
1016 * This condition ensures that we 'leave the irq code' once
1017 * we are out of the entry depth. Thus protecting us from
1018 * the RETURN entry loss.
1019 */
1020 if (*depth_irq >= depth) {
1021 *depth_irq = -1;
1022 return 1;
1023 }
1024
1025 /*
1026 * We are inside the irq code, and this is not the entry.
1027 */
1028 return 1;
1029}
1030
Steven Rostedtac5f6c92009-03-19 11:29:23 -04001031static enum print_line_t
1032print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001033 struct trace_iterator *iter, u32 flags)
Steven Rostedtac5f6c92009-03-19 11:29:23 -04001034{
Jiri Olsabe1eca32009-11-24 13:57:38 +01001035 struct fgraph_data *data = iter->private;
Steven Rostedtac5f6c92009-03-19 11:29:23 -04001036 struct ftrace_graph_ent *call = &field->graph_ent;
1037 struct ftrace_graph_ret_entry *leaf_ret;
Jiri Olsabe1eca32009-11-24 13:57:38 +01001038 static enum print_line_t ret;
1039 int cpu = iter->cpu;
Steven Rostedtac5f6c92009-03-19 11:29:23 -04001040
Jiri Olsa2bd162122010-09-07 16:53:44 +02001041 if (check_irq_entry(iter, flags, call->func, call->depth))
1042 return TRACE_TYPE_HANDLED;
1043
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001044 if (print_graph_prologue(iter, s, TRACE_GRAPH_ENT, call->func, flags))
Steven Rostedtac5f6c92009-03-19 11:29:23 -04001045 return TRACE_TYPE_PARTIAL_LINE;
1046
Frederic Weisbeckerb91facc2009-02-06 18:30:44 +01001047 leaf_ret = get_return_for_leaf(iter, field);
1048 if (leaf_ret)
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001049 ret = print_graph_entry_leaf(iter, field, leaf_ret, s, flags);
Frederic Weisbecker83a8df62008-11-27 01:46:33 +01001050 else
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001051 ret = print_graph_entry_nested(iter, field, s, cpu, flags);
Frederic Weisbecker83a8df62008-11-27 01:46:33 +01001052
Jiri Olsabe1eca32009-11-24 13:57:38 +01001053 if (data) {
1054 /*
1055 * If we failed to write our output, then we need to make
1056 * note of it. Because we already consumed our entry.
1057 */
1058 if (s->full) {
1059 data->failed = 1;
1060 data->cpu = cpu;
1061 } else
1062 data->failed = 0;
1063 }
1064
1065 return ret;
Frederic Weisbecker83a8df62008-11-27 01:46:33 +01001066}
1067
1068static enum print_line_t
1069print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001070 struct trace_entry *ent, struct trace_iterator *iter,
1071 u32 flags)
Frederic Weisbecker83a8df62008-11-27 01:46:33 +01001072{
Frederic Weisbecker83a8df62008-11-27 01:46:33 +01001073 unsigned long long duration = trace->rettime - trace->calltime;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001074 struct fgraph_data *data = iter->private;
1075 pid_t pid = ent->pid;
1076 int cpu = iter->cpu;
Steven Rostedtf1c7f512010-02-26 17:08:16 -05001077 int func_match = 1;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001078 int ret;
1079 int i;
1080
Jiri Olsa2bd162122010-09-07 16:53:44 +02001081 if (check_irq_return(iter, flags, trace->depth))
1082 return TRACE_TYPE_HANDLED;
1083
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001084 if (data) {
Steven Rostedtf1c7f512010-02-26 17:08:16 -05001085 struct fgraph_cpu_data *cpu_data;
1086 int cpu = iter->cpu;
1087
1088 cpu_data = per_cpu_ptr(data->cpu_data, cpu);
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001089
1090 /*
1091 * Comments display at + 1 to depth. This is the
1092 * return from a function, we now want the comments
1093 * to display at the same level of the bracket.
1094 */
Steven Rostedtf1c7f512010-02-26 17:08:16 -05001095 cpu_data->depth = trace->depth - 1;
1096
1097 if (trace->depth < FTRACE_RETFUNC_DEPTH) {
1098 if (cpu_data->enter_funcs[trace->depth] != trace->func)
1099 func_match = 0;
1100 cpu_data->enter_funcs[trace->depth] = 0;
1101 }
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001102 }
Frederic Weisbecker83a8df62008-11-27 01:46:33 +01001103
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001104 if (print_graph_prologue(iter, s, 0, 0, flags))
Frederic Weisbecker83a8df62008-11-27 01:46:33 +01001105 return TRACE_TYPE_PARTIAL_LINE;
1106
Jiri Olsaffeb80f2011-06-03 16:58:48 +02001107 /* Overhead and duration */
1108 ret = print_graph_duration(duration, s, flags);
1109 if (ret == TRACE_TYPE_PARTIAL_LINE)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001110 return TRACE_TYPE_PARTIAL_LINE;
Frederic Weisbecker1a056152008-11-28 00:42:46 +01001111
Frederic Weisbecker83a8df62008-11-27 01:46:33 +01001112 /* Closing brace */
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001113 for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
1114 ret = trace_seq_printf(s, " ");
1115 if (!ret)
1116 return TRACE_TYPE_PARTIAL_LINE;
1117 }
1118
Steven Rostedtf1c7f512010-02-26 17:08:16 -05001119 /*
1120 * If the return function does not have a matching entry,
1121 * then the entry was lost. Instead of just printing
1122 * the '}' and letting the user guess what function this
1123 * belongs to, write out the function name.
1124 */
1125 if (func_match) {
1126 ret = trace_seq_printf(s, "}\n");
1127 if (!ret)
1128 return TRACE_TYPE_PARTIAL_LINE;
1129 } else {
Steven Rostedta094fe02010-03-05 20:08:58 -05001130 ret = trace_seq_printf(s, "} /* %ps */\n", (void *)trace->func);
Steven Rostedtf1c7f512010-02-26 17:08:16 -05001131 if (!ret)
1132 return TRACE_TYPE_PARTIAL_LINE;
1133 }
Frederic Weisbecker83a8df62008-11-27 01:46:33 +01001134
1135 /* Overrun */
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001136 if (flags & TRACE_GRAPH_PRINT_OVERRUN) {
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001137 ret = trace_seq_printf(s, " (Overruns: %lu)\n",
1138 trace->overrun);
1139 if (!ret)
1140 return TRACE_TYPE_PARTIAL_LINE;
1141 }
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +01001142
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001143 ret = print_graph_irq(iter, trace->func, TRACE_GRAPH_RET,
1144 cpu, pid, flags);
Frederic Weisbeckerf8b755a2008-12-09 23:55:25 +01001145 if (ret == TRACE_TYPE_PARTIAL_LINE)
1146 return TRACE_TYPE_PARTIAL_LINE;
1147
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001148 return TRACE_TYPE_HANDLED;
1149}
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001150
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001151static enum print_line_t
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001152print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
1153 struct trace_iterator *iter, u32 flags)
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001154{
Steven Rostedt5087f8d2009-03-19 15:14:46 -04001155 unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001156 struct fgraph_data *data = iter->private;
Steven Rostedt5087f8d2009-03-19 15:14:46 -04001157 struct trace_event *event;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001158 int depth = 0;
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001159 int ret;
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001160 int i;
1161
1162 if (data)
Jiri Olsabe1eca32009-11-24 13:57:38 +01001163 depth = per_cpu_ptr(data->cpu_data, iter->cpu)->depth;
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001164
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001165 if (print_graph_prologue(iter, s, 0, 0, flags))
Frederic Weisbeckerd1f9cbd2009-02-18 04:25:25 +01001166 return TRACE_TYPE_PARTIAL_LINE;
1167
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001168 /* No time */
Jiri Olsaffeb80f2011-06-03 16:58:48 +02001169 ret = print_graph_duration(DURATION_FILL_FULL, s, flags);
1170 if (ret != TRACE_TYPE_HANDLED)
1171 return ret;
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001172
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001173 /* Indentation */
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001174 if (depth > 0)
1175 for (i = 0; i < (depth + 1) * TRACE_GRAPH_INDENT; i++) {
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001176 ret = trace_seq_printf(s, " ");
1177 if (!ret)
1178 return TRACE_TYPE_PARTIAL_LINE;
1179 }
1180
1181 /* The comment */
Frederic Weisbecker769b0442009-03-06 17:21:49 +01001182 ret = trace_seq_printf(s, "/* ");
1183 if (!ret)
1184 return TRACE_TYPE_PARTIAL_LINE;
1185
Steven Rostedt5087f8d2009-03-19 15:14:46 -04001186 switch (iter->ent->type) {
1187 case TRACE_BPRINT:
1188 ret = trace_print_bprintk_msg_only(iter);
1189 if (ret != TRACE_TYPE_HANDLED)
1190 return ret;
1191 break;
1192 case TRACE_PRINT:
1193 ret = trace_print_printk_msg_only(iter);
1194 if (ret != TRACE_TYPE_HANDLED)
1195 return ret;
1196 break;
1197 default:
1198 event = ftrace_find_event(ent->type);
1199 if (!event)
1200 return TRACE_TYPE_UNHANDLED;
1201
Steven Rostedta9a57762010-04-22 18:46:14 -04001202 ret = event->funcs->trace(iter, sym_flags, event);
Steven Rostedt5087f8d2009-03-19 15:14:46 -04001203 if (ret != TRACE_TYPE_HANDLED)
1204 return ret;
1205 }
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001206
Frederic Weisbecker412d0bb2008-12-24 01:43:25 +01001207 /* Strip ending newline */
1208 if (s->buffer[s->len - 1] == '\n') {
1209 s->buffer[s->len - 1] = '\0';
1210 s->len--;
1211 }
1212
Frederic Weisbecker1fd8f2a2008-12-03 23:45:11 +01001213 ret = trace_seq_printf(s, " */\n");
1214 if (!ret)
1215 return TRACE_TYPE_PARTIAL_LINE;
1216
1217 return TRACE_TYPE_HANDLED;
1218}
1219
1220
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001221enum print_line_t
Jiri Olsa321e68b2011-06-03 16:58:47 +02001222print_graph_function_flags(struct trace_iterator *iter, u32 flags)
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001223{
Jiri Olsabe1eca32009-11-24 13:57:38 +01001224 struct ftrace_graph_ent_entry *field;
1225 struct fgraph_data *data = iter->private;
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001226 struct trace_entry *entry = iter->ent;
Steven Rostedt5087f8d2009-03-19 15:14:46 -04001227 struct trace_seq *s = &iter->seq;
Jiri Olsabe1eca32009-11-24 13:57:38 +01001228 int cpu = iter->cpu;
1229 int ret;
1230
1231 if (data && per_cpu_ptr(data->cpu_data, cpu)->ignore) {
1232 per_cpu_ptr(data->cpu_data, cpu)->ignore = 0;
1233 return TRACE_TYPE_HANDLED;
1234 }
1235
1236 /*
1237 * If the last output failed, there's a possibility we need
1238 * to print out the missing entry which would never go out.
1239 */
1240 if (data && data->failed) {
1241 field = &data->ent;
1242 iter->cpu = data->cpu;
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001243 ret = print_graph_entry(field, s, iter, flags);
Jiri Olsabe1eca32009-11-24 13:57:38 +01001244 if (ret == TRACE_TYPE_HANDLED && iter->cpu != cpu) {
1245 per_cpu_ptr(data->cpu_data, iter->cpu)->ignore = 1;
1246 ret = TRACE_TYPE_NO_CONSUME;
1247 }
1248 iter->cpu = cpu;
1249 return ret;
1250 }
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001251
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001252 switch (entry->type) {
1253 case TRACE_GRAPH_ENT: {
Lai Jiangshan38ceb592009-07-28 20:11:24 +08001254 /*
1255 * print_graph_entry() may consume the current event,
1256 * thus @field may become invalid, so we need to save it.
1257 * sizeof(struct ftrace_graph_ent_entry) is very small,
1258 * it can be safely saved at the stack.
1259 */
Jiri Olsabe1eca32009-11-24 13:57:38 +01001260 struct ftrace_graph_ent_entry saved;
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001261 trace_assign_type(field, entry);
Lai Jiangshan38ceb592009-07-28 20:11:24 +08001262 saved = *field;
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001263 return print_graph_entry(&saved, s, iter, flags);
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001264 }
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001265 case TRACE_GRAPH_RET: {
1266 struct ftrace_graph_ret_entry *field;
1267 trace_assign_type(field, entry);
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001268 return print_graph_return(&field->ret, s, entry, iter, flags);
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001269 }
Jiri Olsa62b915f2010-04-02 19:01:22 +02001270 case TRACE_STACK:
1271 case TRACE_FN:
1272 /* dont trace stack and functions as comments */
1273 return TRACE_TYPE_UNHANDLED;
1274
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001275 default:
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001276 return print_graph_comment(s, entry, iter, flags);
Frederic Weisbecker287b6e62008-11-26 00:57:25 +01001277 }
Steven Rostedt5087f8d2009-03-19 15:14:46 -04001278
1279 return TRACE_TYPE_HANDLED;
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001280}
1281
Jiri Olsa9106b692010-04-02 19:01:20 +02001282static enum print_line_t
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001283print_graph_function(struct trace_iterator *iter)
1284{
Jiri Olsa321e68b2011-06-03 16:58:47 +02001285 return print_graph_function_flags(iter, tracer_flags.val);
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001286}
1287
1288static enum print_line_t
Steven Rostedta9a57762010-04-22 18:46:14 -04001289print_graph_function_event(struct trace_iterator *iter, int flags,
1290 struct trace_event *event)
Jiri Olsa9106b692010-04-02 19:01:20 +02001291{
1292 return print_graph_function(iter);
1293}
1294
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001295static void print_lat_header(struct seq_file *s, u32 flags)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001296{
1297 static const char spaces[] = " " /* 16 spaces */
1298 " " /* 4 spaces */
1299 " "; /* 17 spaces */
1300 int size = 0;
1301
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001302 if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001303 size += 16;
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001304 if (flags & TRACE_GRAPH_PRINT_CPU)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001305 size += 4;
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001306 if (flags & TRACE_GRAPH_PRINT_PROC)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001307 size += 17;
1308
1309 seq_printf(s, "#%.*s _-----=> irqs-off \n", size, spaces);
1310 seq_printf(s, "#%.*s / _----=> need-resched \n", size, spaces);
1311 seq_printf(s, "#%.*s| / _---=> hardirq/softirq \n", size, spaces);
1312 seq_printf(s, "#%.*s|| / _--=> preempt-depth \n", size, spaces);
Jiri Olsa199abfa2011-06-03 16:58:50 +02001313 seq_printf(s, "#%.*s||| / \n", size, spaces);
Steven Rostedt49ff5902009-09-11 00:30:26 -04001314}
1315
Jiri Olsa0a772622010-09-23 14:00:52 +02001316static void __print_graph_headers_flags(struct seq_file *s, u32 flags)
Frederic Weisbeckerdecbec32008-12-08 01:56:06 +01001317{
Steven Rostedt49ff5902009-09-11 00:30:26 -04001318 int lat = trace_flags & TRACE_ITER_LATENCY_FMT;
1319
1320 if (lat)
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001321 print_lat_header(s, flags);
Steven Rostedt49ff5902009-09-11 00:30:26 -04001322
Frederic Weisbeckerdecbec32008-12-08 01:56:06 +01001323 /* 1st line */
Steven Rostedt49ff5902009-09-11 00:30:26 -04001324 seq_printf(s, "#");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001325 if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001326 seq_printf(s, " TIME ");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001327 if (flags & TRACE_GRAPH_PRINT_CPU)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001328 seq_printf(s, " CPU");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001329 if (flags & TRACE_GRAPH_PRINT_PROC)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001330 seq_printf(s, " TASK/PID ");
1331 if (lat)
Jiri Olsa199abfa2011-06-03 16:58:50 +02001332 seq_printf(s, "||||");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001333 if (flags & TRACE_GRAPH_PRINT_DURATION)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001334 seq_printf(s, " DURATION ");
1335 seq_printf(s, " FUNCTION CALLS\n");
Frederic Weisbeckerdecbec32008-12-08 01:56:06 +01001336
1337 /* 2nd line */
Steven Rostedt49ff5902009-09-11 00:30:26 -04001338 seq_printf(s, "#");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001339 if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001340 seq_printf(s, " | ");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001341 if (flags & TRACE_GRAPH_PRINT_CPU)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001342 seq_printf(s, " | ");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001343 if (flags & TRACE_GRAPH_PRINT_PROC)
Steven Rostedt49ff5902009-09-11 00:30:26 -04001344 seq_printf(s, " | | ");
1345 if (lat)
Jiri Olsa199abfa2011-06-03 16:58:50 +02001346 seq_printf(s, "||||");
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001347 if (flags & TRACE_GRAPH_PRINT_DURATION)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001348 seq_printf(s, " | | ");
1349 seq_printf(s, " | | | |\n");
Frederic Weisbeckerdecbec32008-12-08 01:56:06 +01001350}
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001351
Jiri Olsa62b915f2010-04-02 19:01:22 +02001352void print_graph_headers(struct seq_file *s)
Jiri Olsad7a8d9e2010-04-02 19:01:21 +02001353{
1354 print_graph_headers_flags(s, tracer_flags.val);
1355}
1356
Jiri Olsa0a772622010-09-23 14:00:52 +02001357void print_graph_headers_flags(struct seq_file *s, u32 flags)
1358{
1359 struct trace_iterator *iter = s->private;
1360
Jiri Olsa749230b2011-06-03 16:58:51 +02001361 if (!(trace_flags & TRACE_ITER_CONTEXT_INFO))
1362 return;
1363
Jiri Olsa0a772622010-09-23 14:00:52 +02001364 if (trace_flags & TRACE_ITER_LATENCY_FMT) {
1365 /* print nothing if the buffers are empty */
1366 if (trace_empty(iter))
1367 return;
1368
1369 print_trace_header(s, iter);
Jiri Olsa321e68b2011-06-03 16:58:47 +02001370 }
Jiri Olsa0a772622010-09-23 14:00:52 +02001371
1372 __print_graph_headers_flags(s, flags);
1373}
1374
Jiri Olsa62b915f2010-04-02 19:01:22 +02001375void graph_trace_open(struct trace_iterator *iter)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001376{
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001377 /* pid and depth on the last trace processed */
Jiri Olsabe1eca32009-11-24 13:57:38 +01001378 struct fgraph_data *data;
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001379 int cpu;
1380
Jiri Olsabe1eca32009-11-24 13:57:38 +01001381 iter->private = NULL;
1382
1383 data = kzalloc(sizeof(*data), GFP_KERNEL);
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001384 if (!data)
Jiri Olsabe1eca32009-11-24 13:57:38 +01001385 goto out_err;
1386
1387 data->cpu_data = alloc_percpu(struct fgraph_cpu_data);
1388 if (!data->cpu_data)
1389 goto out_err_free;
1390
1391 for_each_possible_cpu(cpu) {
1392 pid_t *pid = &(per_cpu_ptr(data->cpu_data, cpu)->last_pid);
1393 int *depth = &(per_cpu_ptr(data->cpu_data, cpu)->depth);
1394 int *ignore = &(per_cpu_ptr(data->cpu_data, cpu)->ignore);
Jiri Olsa2bd162122010-09-07 16:53:44 +02001395 int *depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
1396
Jiri Olsabe1eca32009-11-24 13:57:38 +01001397 *pid = -1;
1398 *depth = 0;
1399 *ignore = 0;
Jiri Olsa2bd162122010-09-07 16:53:44 +02001400 *depth_irq = -1;
Jiri Olsabe1eca32009-11-24 13:57:38 +01001401 }
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001402
Steven Rostedt2fbcdb32009-03-19 13:24:42 -04001403 iter->private = data;
Jiri Olsabe1eca32009-11-24 13:57:38 +01001404
1405 return;
1406
1407 out_err_free:
1408 kfree(data);
1409 out_err:
1410 pr_warning("function graph tracer: not enough memory\n");
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001411}
1412
Jiri Olsa62b915f2010-04-02 19:01:22 +02001413void graph_trace_close(struct trace_iterator *iter)
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001414{
Jiri Olsabe1eca32009-11-24 13:57:38 +01001415 struct fgraph_data *data = iter->private;
1416
1417 if (data) {
1418 free_percpu(data->cpu_data);
1419 kfree(data);
1420 }
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001421}
1422
Steven Rostedtb304d042010-09-14 18:58:33 -04001423static int func_graph_set_flag(u32 old_flags, u32 bit, int set)
1424{
1425 if (bit == TRACE_GRAPH_PRINT_IRQS)
1426 ftrace_graph_skip_irqs = !set;
1427
1428 return 0;
1429}
1430
Steven Rostedta9a57762010-04-22 18:46:14 -04001431static struct trace_event_functions graph_functions = {
1432 .trace = print_graph_function_event,
1433};
1434
Jiri Olsa9106b692010-04-02 19:01:20 +02001435static struct trace_event graph_trace_entry_event = {
1436 .type = TRACE_GRAPH_ENT,
Steven Rostedta9a57762010-04-22 18:46:14 -04001437 .funcs = &graph_functions,
Jiri Olsa9106b692010-04-02 19:01:20 +02001438};
1439
1440static struct trace_event graph_trace_ret_event = {
1441 .type = TRACE_GRAPH_RET,
Steven Rostedta9a57762010-04-22 18:46:14 -04001442 .funcs = &graph_functions
Jiri Olsa9106b692010-04-02 19:01:20 +02001443};
1444
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001445static struct tracer graph_trace __read_mostly = {
Steven Rostedtef180122009-03-10 14:10:56 -04001446 .name = "function_graph",
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001447 .open = graph_trace_open,
Jiri Olsabe1eca32009-11-24 13:57:38 +01001448 .pipe_open = graph_trace_open,
Frederic Weisbecker9005f3e2009-01-22 17:04:53 -08001449 .close = graph_trace_close,
Jiri Olsabe1eca32009-11-24 13:57:38 +01001450 .pipe_close = graph_trace_close,
Frederic Weisbecker6eaaa5d2009-02-11 02:25:00 +01001451 .wait_pipe = poll_wait_pipe,
Steven Rostedtef180122009-03-10 14:10:56 -04001452 .init = graph_trace_init,
1453 .reset = graph_trace_reset,
Frederic Weisbeckerdecbec32008-12-08 01:56:06 +01001454 .print_line = print_graph_function,
1455 .print_header = print_graph_headers,
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001456 .flags = &tracer_flags,
Steven Rostedtb304d042010-09-14 18:58:33 -04001457 .set_flag = func_graph_set_flag,
Frederic Weisbecker7447dce2009-02-07 21:33:57 +01001458#ifdef CONFIG_FTRACE_SELFTEST
1459 .selftest = trace_selftest_startup_function_graph,
1460#endif
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001461};
1462
Steven Rostedt8741db52013-01-16 10:49:37 -05001463
1464static ssize_t
1465graph_depth_write(struct file *filp, const char __user *ubuf, size_t cnt,
1466 loff_t *ppos)
1467{
1468 unsigned long val;
1469 int ret;
1470
1471 ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
1472 if (ret)
1473 return ret;
1474
1475 max_depth = val;
1476
1477 *ppos += cnt;
1478
1479 return cnt;
1480}
1481
1482static ssize_t
1483graph_depth_read(struct file *filp, char __user *ubuf, size_t cnt,
1484 loff_t *ppos)
1485{
1486 char buf[15]; /* More than enough to hold UINT_MAX + "\n"*/
1487 int n;
1488
1489 n = sprintf(buf, "%d\n", max_depth);
1490
1491 return simple_read_from_buffer(ubuf, cnt, ppos, buf, n);
1492}
1493
1494static const struct file_operations graph_depth_fops = {
1495 .open = tracing_open_generic,
1496 .write = graph_depth_write,
1497 .read = graph_depth_read,
1498 .llseek = generic_file_llseek,
1499};
1500
1501static __init int init_graph_debugfs(void)
1502{
1503 struct dentry *d_tracer;
1504
1505 d_tracer = tracing_init_dentry();
1506 if (!d_tracer)
1507 return 0;
1508
1509 trace_create_file("max_graph_depth", 0644, d_tracer,
1510 NULL, &graph_depth_fops);
1511
1512 return 0;
1513}
1514fs_initcall(init_graph_debugfs);
1515
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001516static __init int init_graph_trace(void)
1517{
Lai Jiangshan0c9e6f62009-07-28 20:26:06 +08001518 max_bytes_for_cpu = snprintf(NULL, 0, "%d", nr_cpu_ids - 1);
1519
Jiri Olsa9106b692010-04-02 19:01:20 +02001520 if (!register_ftrace_event(&graph_trace_entry_event)) {
1521 pr_warning("Warning: could not register graph trace events\n");
1522 return 1;
1523 }
1524
1525 if (!register_ftrace_event(&graph_trace_ret_event)) {
1526 pr_warning("Warning: could not register graph trace events\n");
1527 return 1;
1528 }
1529
Frederic Weisbeckerfb526072008-11-25 21:07:04 +01001530 return register_tracer(&graph_trace);
1531}
1532
Steven Rostedt6f415672012-10-05 12:13:07 -04001533core_initcall(init_graph_trace);