Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Function graph tracer. |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 4 | * Copyright (c) 2008-2009 Frederic Weisbecker <fweisbec@gmail.com> |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 5 | * 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 Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 12 | #include <linux/slab.h> |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 13 | #include <linux/fs.h> |
| 14 | |
| 15 | #include "trace.h" |
Steven Rostedt | f0868d1 | 2008-12-23 23:24:12 -0500 | [diff] [blame] | 16 | #include "trace_output.h" |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 17 | |
Steven Rostedt | b304d04 | 2010-09-14 18:58:33 -0400 | [diff] [blame] | 18 | /* When set, irq functions will be ignored */ |
| 19 | static int ftrace_graph_skip_irqs; |
| 20 | |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 21 | struct fgraph_cpu_data { |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 22 | pid_t last_pid; |
| 23 | int depth; |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 24 | int depth_irq; |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 25 | int ignore; |
Steven Rostedt | f1c7f51 | 2010-02-26 17:08:16 -0500 | [diff] [blame] | 26 | unsigned long enter_funcs[FTRACE_RETFUNC_DEPTH]; |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 27 | }; |
| 28 | |
| 29 | struct fgraph_data { |
Namhyung Kim | 6016ee1 | 2010-08-11 12:47:59 +0900 | [diff] [blame] | 30 | struct fgraph_cpu_data __percpu *cpu_data; |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 31 | |
| 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 Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 37 | }; |
| 38 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 39 | #define TRACE_GRAPH_INDENT 2 |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 40 | |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 41 | /* Flag options */ |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 42 | #define TRACE_GRAPH_PRINT_OVERRUN 0x1 |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 43 | #define TRACE_GRAPH_PRINT_CPU 0x2 |
| 44 | #define TRACE_GRAPH_PRINT_OVERHEAD 0x4 |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 45 | #define TRACE_GRAPH_PRINT_PROC 0x8 |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 46 | #define TRACE_GRAPH_PRINT_DURATION 0x10 |
Jiri Olsa | 9106b69 | 2010-04-02 19:01:20 +0200 | [diff] [blame] | 47 | #define TRACE_GRAPH_PRINT_ABS_TIME 0x20 |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 48 | #define TRACE_GRAPH_PRINT_IRQS 0x40 |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 49 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 50 | static struct tracer_opt trace_opts[] = { |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 51 | /* Display overruns? (for self-debug purpose) */ |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 52 | { TRACER_OPT(funcgraph-overrun, TRACE_GRAPH_PRINT_OVERRUN) }, |
| 53 | /* Display CPU ? */ |
| 54 | { TRACER_OPT(funcgraph-cpu, TRACE_GRAPH_PRINT_CPU) }, |
| 55 | /* Display Overhead ? */ |
| 56 | { TRACER_OPT(funcgraph-overhead, TRACE_GRAPH_PRINT_OVERHEAD) }, |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 57 | /* Display proc name/pid */ |
| 58 | { TRACER_OPT(funcgraph-proc, TRACE_GRAPH_PRINT_PROC) }, |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 59 | /* Display duration of execution */ |
| 60 | { TRACER_OPT(funcgraph-duration, TRACE_GRAPH_PRINT_DURATION) }, |
| 61 | /* Display absolute time of an entry */ |
| 62 | { TRACER_OPT(funcgraph-abstime, TRACE_GRAPH_PRINT_ABS_TIME) }, |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 63 | /* Display interrupts */ |
| 64 | { TRACER_OPT(funcgraph-irqs, TRACE_GRAPH_PRINT_IRQS) }, |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 65 | { } /* Empty entry */ |
| 66 | }; |
| 67 | |
| 68 | static struct tracer_flags tracer_flags = { |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 69 | /* Don't display overruns and proc by default */ |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 70 | .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD | |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 71 | TRACE_GRAPH_PRINT_DURATION | TRACE_GRAPH_PRINT_IRQS, |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 72 | .opts = trace_opts |
| 73 | }; |
| 74 | |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 75 | static struct trace_array *graph_array; |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 76 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 77 | |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 78 | /* Add a function return address to the trace stack on thread info.*/ |
| 79 | int |
Steven Rostedt | 71e308a | 2009-06-18 12:45:08 -0400 | [diff] [blame] | 80 | ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth, |
| 81 | unsigned long frame_pointer) |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 82 | { |
Steven Rostedt | 5d1a03d | 2009-03-23 23:38:49 -0400 | [diff] [blame] | 83 | unsigned long long calltime; |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 84 | int index; |
| 85 | |
| 86 | if (!current->ret_stack) |
| 87 | return -EBUSY; |
| 88 | |
Steven Rostedt | 82310a3 | 2009-06-02 12:26:07 -0400 | [diff] [blame] | 89 | /* |
| 90 | * We must make sure the ret_stack is tested before we read |
| 91 | * anything else. |
| 92 | */ |
| 93 | smp_rmb(); |
| 94 | |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 95 | /* The return trace stack is full */ |
| 96 | if (current->curr_ret_stack == FTRACE_RETFUNC_DEPTH - 1) { |
| 97 | atomic_inc(¤t->trace_overrun); |
| 98 | return -EBUSY; |
| 99 | } |
| 100 | |
Steven Rostedt | 5d1a03d | 2009-03-23 23:38:49 -0400 | [diff] [blame] | 101 | calltime = trace_clock_local(); |
| 102 | |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 103 | index = ++current->curr_ret_stack; |
| 104 | barrier(); |
| 105 | current->ret_stack[index].ret = ret; |
| 106 | current->ret_stack[index].func = func; |
Steven Rostedt | 5d1a03d | 2009-03-23 23:38:49 -0400 | [diff] [blame] | 107 | current->ret_stack[index].calltime = calltime; |
Steven Rostedt | a2a16d6 | 2009-03-24 23:17:58 -0400 | [diff] [blame] | 108 | current->ret_stack[index].subtime = 0; |
Steven Rostedt | 71e308a | 2009-06-18 12:45:08 -0400 | [diff] [blame] | 109 | current->ret_stack[index].fp = frame_pointer; |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 110 | *depth = index; |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | /* Retrieve a function return address to the trace stack on thread info.*/ |
Steven Rostedt | a2a16d6 | 2009-03-24 23:17:58 -0400 | [diff] [blame] | 116 | static void |
Steven Rostedt | 71e308a | 2009-06-18 12:45:08 -0400 | [diff] [blame] | 117 | ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret, |
| 118 | unsigned long frame_pointer) |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 119 | { |
| 120 | int index; |
| 121 | |
| 122 | index = current->curr_ret_stack; |
| 123 | |
| 124 | if (unlikely(index < 0)) { |
| 125 | ftrace_graph_stop(); |
| 126 | WARN_ON(1); |
| 127 | /* Might as well panic, otherwise we have no where to go */ |
| 128 | *ret = (unsigned long)panic; |
| 129 | return; |
| 130 | } |
| 131 | |
Steven Rostedt | 71e308a | 2009-06-18 12:45:08 -0400 | [diff] [blame] | 132 | #ifdef CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST |
| 133 | /* |
| 134 | * The arch may choose to record the frame pointer used |
| 135 | * and check it here to make sure that it is what we expect it |
| 136 | * to be. If gcc does not set the place holder of the return |
| 137 | * address in the frame pointer, and does a copy instead, then |
| 138 | * the function graph trace will fail. This test detects this |
| 139 | * case. |
| 140 | * |
| 141 | * Currently, x86_32 with optimize for size (-Os) makes the latest |
| 142 | * gcc do the above. |
| 143 | */ |
| 144 | if (unlikely(current->ret_stack[index].fp != frame_pointer)) { |
| 145 | ftrace_graph_stop(); |
| 146 | WARN(1, "Bad frame pointer: expected %lx, received %lx\n" |
Steven Rostedt | b375a11 | 2009-09-17 00:05:58 -0400 | [diff] [blame] | 147 | " from func %ps return to %lx\n", |
Steven Rostedt | 71e308a | 2009-06-18 12:45:08 -0400 | [diff] [blame] | 148 | current->ret_stack[index].fp, |
| 149 | frame_pointer, |
| 150 | (void *)current->ret_stack[index].func, |
| 151 | current->ret_stack[index].ret); |
| 152 | *ret = (unsigned long)panic; |
| 153 | return; |
| 154 | } |
| 155 | #endif |
| 156 | |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 157 | *ret = current->ret_stack[index].ret; |
| 158 | trace->func = current->ret_stack[index].func; |
| 159 | trace->calltime = current->ret_stack[index].calltime; |
| 160 | trace->overrun = atomic_read(¤t->trace_overrun); |
| 161 | trace->depth = index; |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | /* |
| 165 | * Send the trace to the ring-buffer. |
| 166 | * @return the original return address. |
| 167 | */ |
Steven Rostedt | 71e308a | 2009-06-18 12:45:08 -0400 | [diff] [blame] | 168 | unsigned long ftrace_return_to_handler(unsigned long frame_pointer) |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 169 | { |
| 170 | struct ftrace_graph_ret trace; |
| 171 | unsigned long ret; |
| 172 | |
Steven Rostedt | 71e308a | 2009-06-18 12:45:08 -0400 | [diff] [blame] | 173 | ftrace_pop_return_trace(&trace, &ret, frame_pointer); |
Frederic Weisbecker | 0012693 | 2009-03-05 01:49:22 +0100 | [diff] [blame] | 174 | trace.rettime = trace_clock_local(); |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 175 | ftrace_graph_return(&trace); |
Steven Rostedt | a2a16d6 | 2009-03-24 23:17:58 -0400 | [diff] [blame] | 176 | barrier(); |
| 177 | current->curr_ret_stack--; |
Steven Rostedt | 712406a | 2009-02-09 10:54:03 -0800 | [diff] [blame] | 178 | |
| 179 | if (unlikely(!ret)) { |
| 180 | ftrace_graph_stop(); |
| 181 | WARN_ON(1); |
| 182 | /* Might as well panic. What else to do? */ |
| 183 | ret = (unsigned long)panic; |
| 184 | } |
| 185 | |
| 186 | return ret; |
| 187 | } |
| 188 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 189 | int __trace_graph_entry(struct trace_array *tr, |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 190 | struct ftrace_graph_ent *trace, |
| 191 | unsigned long flags, |
| 192 | int pc) |
| 193 | { |
| 194 | struct ftrace_event_call *call = &event_funcgraph_entry; |
| 195 | struct ring_buffer_event *event; |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 196 | struct ring_buffer *buffer = tr->buffer; |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 197 | struct ftrace_graph_ent_entry *entry; |
| 198 | |
Rusty Russell | dd17c8f | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 199 | if (unlikely(__this_cpu_read(ftrace_cpu_disabled))) |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 200 | return 0; |
| 201 | |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 202 | event = trace_buffer_lock_reserve(buffer, TRACE_GRAPH_ENT, |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 203 | sizeof(*entry), flags, pc); |
| 204 | if (!event) |
| 205 | return 0; |
| 206 | entry = ring_buffer_event_data(event); |
| 207 | entry->graph_ent = *trace; |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 208 | if (!filter_current_check_discard(buffer, call, entry, event)) |
| 209 | ring_buffer_unlock_commit(buffer, event); |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 210 | |
| 211 | return 1; |
| 212 | } |
| 213 | |
Steven Rostedt | b304d04 | 2010-09-14 18:58:33 -0400 | [diff] [blame] | 214 | static inline int ftrace_graph_ignore_irqs(void) |
| 215 | { |
| 216 | if (!ftrace_graph_skip_irqs) |
| 217 | return 0; |
| 218 | |
| 219 | return in_irq(); |
| 220 | } |
| 221 | |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 222 | int trace_graph_entry(struct ftrace_graph_ent *trace) |
| 223 | { |
| 224 | struct trace_array *tr = graph_array; |
| 225 | struct trace_array_cpu *data; |
| 226 | unsigned long flags; |
| 227 | long disabled; |
| 228 | int ret; |
| 229 | int cpu; |
| 230 | int pc; |
| 231 | |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 232 | if (!ftrace_trace_task(current)) |
| 233 | return 0; |
| 234 | |
Lai Jiangshan | ea2c68a | 2010-01-13 19:38:30 +0800 | [diff] [blame] | 235 | /* trace it when it is-nested-in or is a function enabled. */ |
Steven Rostedt | b304d04 | 2010-09-14 18:58:33 -0400 | [diff] [blame] | 236 | if (!(trace->depth || ftrace_graph_addr(trace->func)) || |
| 237 | ftrace_graph_ignore_irqs()) |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 238 | return 0; |
| 239 | |
| 240 | local_irq_save(flags); |
| 241 | cpu = raw_smp_processor_id(); |
| 242 | data = tr->data[cpu]; |
| 243 | disabled = atomic_inc_return(&data->disabled); |
| 244 | if (likely(disabled == 1)) { |
| 245 | pc = preempt_count(); |
| 246 | ret = __trace_graph_entry(tr, trace, flags, pc); |
| 247 | } else { |
| 248 | ret = 0; |
| 249 | } |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 250 | |
| 251 | atomic_dec(&data->disabled); |
| 252 | local_irq_restore(flags); |
| 253 | |
| 254 | return ret; |
| 255 | } |
| 256 | |
Tim Bird | 0e95017 | 2010-02-25 15:36:43 -0800 | [diff] [blame] | 257 | int trace_graph_thresh_entry(struct ftrace_graph_ent *trace) |
| 258 | { |
| 259 | if (tracing_thresh) |
| 260 | return 1; |
| 261 | else |
| 262 | return trace_graph_entry(trace); |
| 263 | } |
| 264 | |
Jiri Olsa | 0a77262 | 2010-09-23 14:00:52 +0200 | [diff] [blame] | 265 | static void |
| 266 | __trace_graph_function(struct trace_array *tr, |
| 267 | unsigned long ip, unsigned long flags, int pc) |
| 268 | { |
| 269 | u64 time = trace_clock_local(); |
| 270 | struct ftrace_graph_ent ent = { |
| 271 | .func = ip, |
| 272 | .depth = 0, |
| 273 | }; |
| 274 | struct ftrace_graph_ret ret = { |
| 275 | .func = ip, |
| 276 | .depth = 0, |
| 277 | .calltime = time, |
| 278 | .rettime = time, |
| 279 | }; |
| 280 | |
| 281 | __trace_graph_entry(tr, &ent, flags, pc); |
| 282 | __trace_graph_return(tr, &ret, flags, pc); |
| 283 | } |
| 284 | |
| 285 | void |
| 286 | trace_graph_function(struct trace_array *tr, |
| 287 | unsigned long ip, unsigned long parent_ip, |
| 288 | unsigned long flags, int pc) |
| 289 | { |
Jiri Olsa | 0a77262 | 2010-09-23 14:00:52 +0200 | [diff] [blame] | 290 | __trace_graph_function(tr, ip, flags, pc); |
| 291 | } |
| 292 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 293 | void __trace_graph_return(struct trace_array *tr, |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 294 | struct ftrace_graph_ret *trace, |
| 295 | unsigned long flags, |
| 296 | int pc) |
| 297 | { |
| 298 | struct ftrace_event_call *call = &event_funcgraph_exit; |
| 299 | struct ring_buffer_event *event; |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 300 | struct ring_buffer *buffer = tr->buffer; |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 301 | struct ftrace_graph_ret_entry *entry; |
| 302 | |
Rusty Russell | dd17c8f | 2009-10-29 22:34:15 +0900 | [diff] [blame] | 303 | if (unlikely(__this_cpu_read(ftrace_cpu_disabled))) |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 304 | return; |
| 305 | |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 306 | event = trace_buffer_lock_reserve(buffer, TRACE_GRAPH_RET, |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 307 | sizeof(*entry), flags, pc); |
| 308 | if (!event) |
| 309 | return; |
| 310 | entry = ring_buffer_event_data(event); |
| 311 | entry->ret = *trace; |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 312 | if (!filter_current_check_discard(buffer, call, entry, event)) |
| 313 | ring_buffer_unlock_commit(buffer, event); |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 314 | } |
| 315 | |
| 316 | void trace_graph_return(struct ftrace_graph_ret *trace) |
| 317 | { |
| 318 | struct trace_array *tr = graph_array; |
| 319 | struct trace_array_cpu *data; |
| 320 | unsigned long flags; |
| 321 | long disabled; |
| 322 | int cpu; |
| 323 | int pc; |
| 324 | |
| 325 | local_irq_save(flags); |
| 326 | cpu = raw_smp_processor_id(); |
| 327 | data = tr->data[cpu]; |
| 328 | disabled = atomic_inc_return(&data->disabled); |
| 329 | if (likely(disabled == 1)) { |
| 330 | pc = preempt_count(); |
| 331 | __trace_graph_return(tr, trace, flags, pc); |
| 332 | } |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 333 | atomic_dec(&data->disabled); |
| 334 | local_irq_restore(flags); |
| 335 | } |
| 336 | |
Frederic Weisbecker | 24a5365 | 2010-01-14 08:23:15 +0100 | [diff] [blame] | 337 | void set_graph_array(struct trace_array *tr) |
| 338 | { |
| 339 | graph_array = tr; |
| 340 | |
| 341 | /* Make graph_array visible before we start tracing */ |
| 342 | |
| 343 | smp_mb(); |
| 344 | } |
| 345 | |
Tim Bird | 0e95017 | 2010-02-25 15:36:43 -0800 | [diff] [blame] | 346 | void trace_graph_thresh_return(struct ftrace_graph_ret *trace) |
| 347 | { |
| 348 | if (tracing_thresh && |
| 349 | (trace->rettime - trace->calltime < tracing_thresh)) |
| 350 | return; |
| 351 | else |
| 352 | trace_graph_return(trace); |
| 353 | } |
| 354 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 355 | static int graph_trace_init(struct trace_array *tr) |
| 356 | { |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 357 | int ret; |
| 358 | |
Frederic Weisbecker | 24a5365 | 2010-01-14 08:23:15 +0100 | [diff] [blame] | 359 | set_graph_array(tr); |
Tim Bird | 0e95017 | 2010-02-25 15:36:43 -0800 | [diff] [blame] | 360 | if (tracing_thresh) |
| 361 | ret = register_ftrace_graph(&trace_graph_thresh_return, |
| 362 | &trace_graph_thresh_entry); |
| 363 | else |
| 364 | ret = register_ftrace_graph(&trace_graph_return, |
| 365 | &trace_graph_entry); |
Steven Rostedt | 660c7f9 | 2008-11-26 00:16:26 -0500 | [diff] [blame] | 366 | if (ret) |
| 367 | return ret; |
| 368 | tracing_start_cmdline_record(); |
| 369 | |
| 370 | return 0; |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 371 | } |
| 372 | |
| 373 | static void graph_trace_reset(struct trace_array *tr) |
| 374 | { |
Steven Rostedt | 660c7f9 | 2008-11-26 00:16:26 -0500 | [diff] [blame] | 375 | tracing_stop_cmdline_record(); |
| 376 | unregister_ftrace_graph(); |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 377 | } |
| 378 | |
Lai Jiangshan | 0c9e6f6 | 2009-07-28 20:26:06 +0800 | [diff] [blame] | 379 | static int max_bytes_for_cpu; |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 380 | |
| 381 | static enum print_line_t |
| 382 | print_graph_cpu(struct trace_seq *s, int cpu) |
| 383 | { |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 384 | int ret; |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 385 | |
Ingo Molnar | d51090b | 2008-11-28 09:55:16 +0100 | [diff] [blame] | 386 | /* |
| 387 | * Start with a space character - to make it stand out |
| 388 | * to the right a bit when trace output is pasted into |
| 389 | * email: |
| 390 | */ |
Lai Jiangshan | 0c9e6f6 | 2009-07-28 20:26:06 +0800 | [diff] [blame] | 391 | ret = trace_seq_printf(s, " %*d) ", max_bytes_for_cpu, cpu); |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 392 | if (!ret) |
Ingo Molnar | d51090b | 2008-11-28 09:55:16 +0100 | [diff] [blame] | 393 | return TRACE_TYPE_PARTIAL_LINE; |
| 394 | |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 395 | return TRACE_TYPE_HANDLED; |
| 396 | } |
| 397 | |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 398 | #define TRACE_GRAPH_PROCINFO_LENGTH 14 |
| 399 | |
| 400 | static enum print_line_t |
| 401 | print_graph_proc(struct trace_seq *s, pid_t pid) |
| 402 | { |
Steven Rostedt | 4ca53085 | 2009-03-16 19:20:15 -0400 | [diff] [blame] | 403 | char comm[TASK_COMM_LEN]; |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 404 | /* sign + log10(MAX_INT) + '\0' */ |
| 405 | char pid_str[11]; |
Steven Rostedt | 4ca53085 | 2009-03-16 19:20:15 -0400 | [diff] [blame] | 406 | int spaces = 0; |
| 407 | int ret; |
| 408 | int len; |
| 409 | int i; |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 410 | |
Steven Rostedt | 4ca53085 | 2009-03-16 19:20:15 -0400 | [diff] [blame] | 411 | trace_find_cmdline(pid, comm); |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 412 | comm[7] = '\0'; |
| 413 | sprintf(pid_str, "%d", pid); |
| 414 | |
| 415 | /* 1 stands for the "-" character */ |
| 416 | len = strlen(comm) + strlen(pid_str) + 1; |
| 417 | |
| 418 | if (len < TRACE_GRAPH_PROCINFO_LENGTH) |
| 419 | spaces = TRACE_GRAPH_PROCINFO_LENGTH - len; |
| 420 | |
| 421 | /* First spaces to align center */ |
| 422 | for (i = 0; i < spaces / 2; i++) { |
| 423 | ret = trace_seq_printf(s, " "); |
| 424 | if (!ret) |
| 425 | return TRACE_TYPE_PARTIAL_LINE; |
| 426 | } |
| 427 | |
| 428 | ret = trace_seq_printf(s, "%s-%s", comm, pid_str); |
| 429 | if (!ret) |
| 430 | return TRACE_TYPE_PARTIAL_LINE; |
| 431 | |
| 432 | /* Last spaces to align center */ |
| 433 | for (i = 0; i < spaces - (spaces / 2); i++) { |
| 434 | ret = trace_seq_printf(s, " "); |
| 435 | if (!ret) |
| 436 | return TRACE_TYPE_PARTIAL_LINE; |
| 437 | } |
| 438 | return TRACE_TYPE_HANDLED; |
| 439 | } |
| 440 | |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 441 | |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 442 | static enum print_line_t |
| 443 | print_graph_lat_fmt(struct trace_seq *s, struct trace_entry *entry) |
| 444 | { |
Steven Rostedt | f81c972 | 2009-09-11 14:24:13 -0400 | [diff] [blame] | 445 | if (!trace_seq_putc(s, ' ')) |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 446 | return 0; |
| 447 | |
Steven Rostedt | f81c972 | 2009-09-11 14:24:13 -0400 | [diff] [blame] | 448 | return trace_print_lat_fmt(s, entry); |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 449 | } |
| 450 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 451 | /* If the pid changed since the last trace, output this event */ |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 452 | static enum print_line_t |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 453 | verif_pid(struct trace_seq *s, pid_t pid, int cpu, struct fgraph_data *data) |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 454 | { |
Ingo Molnar | d51090b | 2008-11-28 09:55:16 +0100 | [diff] [blame] | 455 | pid_t prev_pid; |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 456 | pid_t *last_pid; |
Ingo Molnar | d51090b | 2008-11-28 09:55:16 +0100 | [diff] [blame] | 457 | int ret; |
Steven Rostedt | 660c7f9 | 2008-11-26 00:16:26 -0500 | [diff] [blame] | 458 | |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 459 | if (!data) |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 460 | return TRACE_TYPE_HANDLED; |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 461 | |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 462 | last_pid = &(per_cpu_ptr(data->cpu_data, cpu)->last_pid); |
Steven Rostedt | 660c7f9 | 2008-11-26 00:16:26 -0500 | [diff] [blame] | 463 | |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 464 | if (*last_pid == pid) |
| 465 | return TRACE_TYPE_HANDLED; |
| 466 | |
| 467 | prev_pid = *last_pid; |
| 468 | *last_pid = pid; |
| 469 | |
| 470 | if (prev_pid == -1) |
| 471 | return TRACE_TYPE_HANDLED; |
Ingo Molnar | d51090b | 2008-11-28 09:55:16 +0100 | [diff] [blame] | 472 | /* |
| 473 | * Context-switch trace line: |
| 474 | |
| 475 | ------------------------------------------ |
| 476 | | 1) migration/0--1 => sshd-1755 |
| 477 | ------------------------------------------ |
| 478 | |
| 479 | */ |
| 480 | ret = trace_seq_printf(s, |
Frederic Weisbecker | 1fd8f2a | 2008-12-03 23:45:11 +0100 | [diff] [blame] | 481 | " ------------------------------------------\n"); |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 482 | if (!ret) |
Wenji Huang | 810dc73 | 2009-02-10 01:03:05 -0500 | [diff] [blame] | 483 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 484 | |
| 485 | ret = print_graph_cpu(s, cpu); |
| 486 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
Wenji Huang | 810dc73 | 2009-02-10 01:03:05 -0500 | [diff] [blame] | 487 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 488 | |
| 489 | ret = print_graph_proc(s, prev_pid); |
| 490 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
Wenji Huang | 810dc73 | 2009-02-10 01:03:05 -0500 | [diff] [blame] | 491 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 492 | |
| 493 | ret = trace_seq_printf(s, " => "); |
| 494 | if (!ret) |
Wenji Huang | 810dc73 | 2009-02-10 01:03:05 -0500 | [diff] [blame] | 495 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 496 | |
| 497 | ret = print_graph_proc(s, pid); |
| 498 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
Wenji Huang | 810dc73 | 2009-02-10 01:03:05 -0500 | [diff] [blame] | 499 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 500 | |
| 501 | ret = trace_seq_printf(s, |
| 502 | "\n ------------------------------------------\n\n"); |
| 503 | if (!ret) |
Wenji Huang | 810dc73 | 2009-02-10 01:03:05 -0500 | [diff] [blame] | 504 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 505 | |
Wenji Huang | 810dc73 | 2009-02-10 01:03:05 -0500 | [diff] [blame] | 506 | return TRACE_TYPE_HANDLED; |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 507 | } |
| 508 | |
Frederic Weisbecker | b91facc | 2009-02-06 18:30:44 +0100 | [diff] [blame] | 509 | static struct ftrace_graph_ret_entry * |
| 510 | get_return_for_leaf(struct trace_iterator *iter, |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 511 | struct ftrace_graph_ent_entry *curr) |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 512 | { |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 513 | struct fgraph_data *data = iter->private; |
| 514 | struct ring_buffer_iter *ring_iter = NULL; |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 515 | struct ring_buffer_event *event; |
| 516 | struct ftrace_graph_ret_entry *next; |
| 517 | |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 518 | /* |
| 519 | * If the previous output failed to write to the seq buffer, |
| 520 | * then we just reuse the data from before. |
| 521 | */ |
| 522 | if (data && data->failed) { |
| 523 | curr = &data->ent; |
| 524 | next = &data->ret; |
| 525 | } else { |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 526 | |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 527 | ring_iter = iter->buffer_iter[iter->cpu]; |
| 528 | |
| 529 | /* First peek to compare current entry and the next one */ |
| 530 | if (ring_iter) |
| 531 | event = ring_buffer_iter_peek(ring_iter, NULL); |
| 532 | else { |
| 533 | /* |
| 534 | * We need to consume the current entry to see |
| 535 | * the next one. |
| 536 | */ |
Steven Rostedt | 66a8cb9 | 2010-03-31 13:21:56 -0400 | [diff] [blame] | 537 | ring_buffer_consume(iter->tr->buffer, iter->cpu, |
| 538 | NULL, NULL); |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 539 | event = ring_buffer_peek(iter->tr->buffer, iter->cpu, |
Steven Rostedt | 66a8cb9 | 2010-03-31 13:21:56 -0400 | [diff] [blame] | 540 | NULL, NULL); |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 541 | } |
| 542 | |
| 543 | if (!event) |
| 544 | return NULL; |
| 545 | |
| 546 | next = ring_buffer_event_data(event); |
| 547 | |
| 548 | if (data) { |
| 549 | /* |
| 550 | * Save current and next entries for later reference |
| 551 | * if the output fails. |
| 552 | */ |
| 553 | data->ent = *curr; |
Shaohua Li | 575570f | 2010-07-27 16:06:34 +0800 | [diff] [blame] | 554 | /* |
| 555 | * If the next event is not a return type, then |
| 556 | * we only care about what type it is. Otherwise we can |
| 557 | * safely copy the entire event. |
| 558 | */ |
| 559 | if (next->ent.type == TRACE_GRAPH_RET) |
| 560 | data->ret = *next; |
| 561 | else |
| 562 | data->ret.ent.type = next->ent.type; |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 563 | } |
Frederic Weisbecker | b91facc | 2009-02-06 18:30:44 +0100 | [diff] [blame] | 564 | } |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 565 | |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 566 | if (next->ent.type != TRACE_GRAPH_RET) |
Frederic Weisbecker | b91facc | 2009-02-06 18:30:44 +0100 | [diff] [blame] | 567 | return NULL; |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 568 | |
| 569 | if (curr->ent.pid != next->ent.pid || |
| 570 | curr->graph_ent.func != next->ret.func) |
Frederic Weisbecker | b91facc | 2009-02-06 18:30:44 +0100 | [diff] [blame] | 571 | return NULL; |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 572 | |
Frederic Weisbecker | b91facc | 2009-02-06 18:30:44 +0100 | [diff] [blame] | 573 | /* this is a leaf, now advance the iterator */ |
| 574 | if (ring_iter) |
| 575 | ring_buffer_read(ring_iter, NULL); |
| 576 | |
| 577 | return next; |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 578 | } |
| 579 | |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 580 | /* Signal a overhead of time execution to the output */ |
| 581 | static int |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 582 | print_graph_overhead(unsigned long long duration, struct trace_seq *s, |
| 583 | u32 flags) |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 584 | { |
| 585 | /* If duration disappear, we don't need anything */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 586 | if (!(flags & TRACE_GRAPH_PRINT_DURATION)) |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 587 | return 1; |
| 588 | |
| 589 | /* Non nested entry or return */ |
| 590 | if (duration == -1) |
| 591 | return trace_seq_printf(s, " "); |
| 592 | |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 593 | if (flags & TRACE_GRAPH_PRINT_OVERHEAD) { |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 594 | /* Duration exceeded 100 msecs */ |
| 595 | if (duration > 100000ULL) |
| 596 | return trace_seq_printf(s, "! "); |
| 597 | |
| 598 | /* Duration exceeded 10 msecs */ |
| 599 | if (duration > 10000ULL) |
| 600 | return trace_seq_printf(s, "+ "); |
| 601 | } |
| 602 | |
| 603 | return trace_seq_printf(s, " "); |
| 604 | } |
| 605 | |
Frederic Weisbecker | d1f9cbd | 2009-02-18 04:25:25 +0100 | [diff] [blame] | 606 | static int print_graph_abs_time(u64 t, struct trace_seq *s) |
| 607 | { |
| 608 | unsigned long usecs_rem; |
| 609 | |
| 610 | usecs_rem = do_div(t, NSEC_PER_SEC); |
| 611 | usecs_rem /= 1000; |
| 612 | |
| 613 | return trace_seq_printf(s, "%5lu.%06lu | ", |
| 614 | (unsigned long)t, usecs_rem); |
| 615 | } |
| 616 | |
Frederic Weisbecker | f8b755a | 2008-12-09 23:55:25 +0100 | [diff] [blame] | 617 | static enum print_line_t |
Frederic Weisbecker | d1f9cbd | 2009-02-18 04:25:25 +0100 | [diff] [blame] | 618 | print_graph_irq(struct trace_iterator *iter, unsigned long addr, |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 619 | enum trace_type type, int cpu, pid_t pid, u32 flags) |
Frederic Weisbecker | f8b755a | 2008-12-09 23:55:25 +0100 | [diff] [blame] | 620 | { |
| 621 | int ret; |
Frederic Weisbecker | d1f9cbd | 2009-02-18 04:25:25 +0100 | [diff] [blame] | 622 | struct trace_seq *s = &iter->seq; |
Frederic Weisbecker | f8b755a | 2008-12-09 23:55:25 +0100 | [diff] [blame] | 623 | |
| 624 | if (addr < (unsigned long)__irqentry_text_start || |
| 625 | addr >= (unsigned long)__irqentry_text_end) |
| 626 | return TRACE_TYPE_UNHANDLED; |
| 627 | |
Frederic Weisbecker | d1f9cbd | 2009-02-18 04:25:25 +0100 | [diff] [blame] | 628 | /* Absolute time */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 629 | if (flags & TRACE_GRAPH_PRINT_ABS_TIME) { |
Frederic Weisbecker | d1f9cbd | 2009-02-18 04:25:25 +0100 | [diff] [blame] | 630 | ret = print_graph_abs_time(iter->ts, s); |
| 631 | if (!ret) |
| 632 | return TRACE_TYPE_PARTIAL_LINE; |
| 633 | } |
| 634 | |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 635 | /* Cpu */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 636 | if (flags & TRACE_GRAPH_PRINT_CPU) { |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 637 | ret = print_graph_cpu(s, cpu); |
| 638 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
| 639 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | f8b755a | 2008-12-09 23:55:25 +0100 | [diff] [blame] | 640 | } |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 641 | |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 642 | /* Proc */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 643 | if (flags & TRACE_GRAPH_PRINT_PROC) { |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 644 | ret = print_graph_proc(s, pid); |
| 645 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
| 646 | return TRACE_TYPE_PARTIAL_LINE; |
| 647 | ret = trace_seq_printf(s, " | "); |
| 648 | if (!ret) |
| 649 | return TRACE_TYPE_PARTIAL_LINE; |
| 650 | } |
| 651 | |
| 652 | /* No overhead */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 653 | ret = print_graph_overhead(-1, s, flags); |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 654 | if (!ret) |
| 655 | return TRACE_TYPE_PARTIAL_LINE; |
| 656 | |
| 657 | if (type == TRACE_GRAPH_ENT) |
| 658 | ret = trace_seq_printf(s, "==========>"); |
| 659 | else |
| 660 | ret = trace_seq_printf(s, "<=========="); |
| 661 | |
| 662 | if (!ret) |
| 663 | return TRACE_TYPE_PARTIAL_LINE; |
| 664 | |
| 665 | /* Don't close the duration column if haven't one */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 666 | if (flags & TRACE_GRAPH_PRINT_DURATION) |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 667 | trace_seq_printf(s, " |"); |
| 668 | ret = trace_seq_printf(s, "\n"); |
| 669 | |
Frederic Weisbecker | f8b755a | 2008-12-09 23:55:25 +0100 | [diff] [blame] | 670 | if (!ret) |
| 671 | return TRACE_TYPE_PARTIAL_LINE; |
| 672 | return TRACE_TYPE_HANDLED; |
| 673 | } |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 674 | |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 675 | enum print_line_t |
| 676 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s) |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 677 | { |
| 678 | unsigned long nsecs_rem = do_div(duration, 1000); |
Frederic Weisbecker | 166d3c7 | 2008-12-03 02:32:12 +0100 | [diff] [blame] | 679 | /* log10(ULONG_MAX) + '\0' */ |
| 680 | char msecs_str[21]; |
| 681 | char nsecs_str[5]; |
| 682 | int ret, len; |
| 683 | int i; |
| 684 | |
| 685 | sprintf(msecs_str, "%lu", (unsigned long) duration); |
| 686 | |
| 687 | /* Print msecs */ |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 688 | ret = trace_seq_printf(s, "%s", msecs_str); |
Frederic Weisbecker | 166d3c7 | 2008-12-03 02:32:12 +0100 | [diff] [blame] | 689 | if (!ret) |
| 690 | return TRACE_TYPE_PARTIAL_LINE; |
| 691 | |
| 692 | len = strlen(msecs_str); |
| 693 | |
| 694 | /* Print nsecs (we don't want to exceed 7 numbers) */ |
| 695 | if (len < 7) { |
Borislav Petkov | 14cae9b | 2010-09-29 10:08:23 +0200 | [diff] [blame] | 696 | size_t slen = min_t(size_t, sizeof(nsecs_str), 8UL - len); |
| 697 | |
| 698 | snprintf(nsecs_str, slen, "%03lu", nsecs_rem); |
Frederic Weisbecker | 166d3c7 | 2008-12-03 02:32:12 +0100 | [diff] [blame] | 699 | ret = trace_seq_printf(s, ".%s", nsecs_str); |
| 700 | if (!ret) |
| 701 | return TRACE_TYPE_PARTIAL_LINE; |
| 702 | len += strlen(nsecs_str); |
| 703 | } |
| 704 | |
| 705 | ret = trace_seq_printf(s, " us "); |
| 706 | if (!ret) |
| 707 | return TRACE_TYPE_PARTIAL_LINE; |
| 708 | |
| 709 | /* Print remaining spaces to fit the row's width */ |
| 710 | for (i = len; i < 7; i++) { |
| 711 | ret = trace_seq_printf(s, " "); |
| 712 | if (!ret) |
| 713 | return TRACE_TYPE_PARTIAL_LINE; |
| 714 | } |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 715 | return TRACE_TYPE_HANDLED; |
| 716 | } |
| 717 | |
| 718 | static enum print_line_t |
| 719 | print_graph_duration(unsigned long long duration, struct trace_seq *s) |
| 720 | { |
| 721 | int ret; |
| 722 | |
| 723 | ret = trace_print_graph_duration(duration, s); |
| 724 | if (ret != TRACE_TYPE_HANDLED) |
| 725 | return ret; |
Frederic Weisbecker | 166d3c7 | 2008-12-03 02:32:12 +0100 | [diff] [blame] | 726 | |
| 727 | ret = trace_seq_printf(s, "| "); |
| 728 | if (!ret) |
| 729 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | 166d3c7 | 2008-12-03 02:32:12 +0100 | [diff] [blame] | 730 | |
Steven Rostedt | 0706f1c | 2009-03-23 23:12:58 -0400 | [diff] [blame] | 731 | return TRACE_TYPE_HANDLED; |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 732 | } |
| 733 | |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 734 | /* Case of a leaf function on its call entry */ |
| 735 | static enum print_line_t |
| 736 | print_graph_entry_leaf(struct trace_iterator *iter, |
Frederic Weisbecker | b91facc | 2009-02-06 18:30:44 +0100 | [diff] [blame] | 737 | struct ftrace_graph_ent_entry *entry, |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 738 | struct ftrace_graph_ret_entry *ret_entry, |
| 739 | struct trace_seq *s, u32 flags) |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 740 | { |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 741 | struct fgraph_data *data = iter->private; |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 742 | struct ftrace_graph_ret *graph_ret; |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 743 | struct ftrace_graph_ent *call; |
| 744 | unsigned long long duration; |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 745 | int ret; |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 746 | int i; |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 747 | |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 748 | graph_ret = &ret_entry->ret; |
| 749 | call = &entry->graph_ent; |
| 750 | duration = graph_ret->rettime - graph_ret->calltime; |
Steven Rostedt | 437f24fb | 2008-11-26 00:16:27 -0500 | [diff] [blame] | 751 | |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 752 | if (data) { |
Steven Rostedt | f1c7f51 | 2010-02-26 17:08:16 -0500 | [diff] [blame] | 753 | struct fgraph_cpu_data *cpu_data; |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 754 | int cpu = iter->cpu; |
Steven Rostedt | f1c7f51 | 2010-02-26 17:08:16 -0500 | [diff] [blame] | 755 | |
| 756 | cpu_data = per_cpu_ptr(data->cpu_data, cpu); |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 757 | |
| 758 | /* |
| 759 | * Comments display at + 1 to depth. Since |
| 760 | * this is a leaf function, keep the comments |
| 761 | * equal to this depth. |
| 762 | */ |
Steven Rostedt | f1c7f51 | 2010-02-26 17:08:16 -0500 | [diff] [blame] | 763 | cpu_data->depth = call->depth - 1; |
| 764 | |
| 765 | /* No need to keep this function around for this depth */ |
| 766 | if (call->depth < FTRACE_RETFUNC_DEPTH) |
| 767 | cpu_data->enter_funcs[call->depth] = 0; |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 768 | } |
| 769 | |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 770 | /* Overhead */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 771 | ret = print_graph_overhead(duration, s, flags); |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 772 | if (!ret) |
| 773 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 774 | |
| 775 | /* Duration */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 776 | if (flags & TRACE_GRAPH_PRINT_DURATION) { |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 777 | ret = print_graph_duration(duration, s); |
| 778 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
| 779 | return TRACE_TYPE_PARTIAL_LINE; |
| 780 | } |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 781 | |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 782 | /* Function */ |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 783 | for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) { |
| 784 | ret = trace_seq_printf(s, " "); |
| 785 | if (!ret) |
| 786 | return TRACE_TYPE_PARTIAL_LINE; |
| 787 | } |
| 788 | |
Steven Rostedt | b375a11 | 2009-09-17 00:05:58 -0400 | [diff] [blame] | 789 | ret = trace_seq_printf(s, "%ps();\n", (void *)call->func); |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 790 | if (!ret) |
| 791 | return TRACE_TYPE_PARTIAL_LINE; |
| 792 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 793 | return TRACE_TYPE_HANDLED; |
| 794 | } |
| 795 | |
| 796 | static enum print_line_t |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 797 | print_graph_entry_nested(struct trace_iterator *iter, |
| 798 | struct ftrace_graph_ent_entry *entry, |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 799 | struct trace_seq *s, int cpu, u32 flags) |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 800 | { |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 801 | struct ftrace_graph_ent *call = &entry->graph_ent; |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 802 | struct fgraph_data *data = iter->private; |
| 803 | int ret; |
| 804 | int i; |
| 805 | |
| 806 | if (data) { |
Steven Rostedt | f1c7f51 | 2010-02-26 17:08:16 -0500 | [diff] [blame] | 807 | struct fgraph_cpu_data *cpu_data; |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 808 | int cpu = iter->cpu; |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 809 | |
Steven Rostedt | f1c7f51 | 2010-02-26 17:08:16 -0500 | [diff] [blame] | 810 | cpu_data = per_cpu_ptr(data->cpu_data, cpu); |
| 811 | cpu_data->depth = call->depth; |
| 812 | |
| 813 | /* Save this function pointer to see if the exit matches */ |
| 814 | if (call->depth < FTRACE_RETFUNC_DEPTH) |
| 815 | cpu_data->enter_funcs[call->depth] = call->func; |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 816 | } |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 817 | |
| 818 | /* No overhead */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 819 | ret = print_graph_overhead(-1, s, flags); |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 820 | if (!ret) |
| 821 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 822 | |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 823 | /* No time */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 824 | if (flags & TRACE_GRAPH_PRINT_DURATION) { |
Frederic Weisbecker | f8b755a | 2008-12-09 23:55:25 +0100 | [diff] [blame] | 825 | ret = trace_seq_printf(s, " | "); |
| 826 | if (!ret) |
| 827 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | f8b755a | 2008-12-09 23:55:25 +0100 | [diff] [blame] | 828 | } |
| 829 | |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 830 | /* Function */ |
| 831 | for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) { |
| 832 | ret = trace_seq_printf(s, " "); |
| 833 | if (!ret) |
| 834 | return TRACE_TYPE_PARTIAL_LINE; |
| 835 | } |
| 836 | |
Steven Rostedt | b375a11 | 2009-09-17 00:05:58 -0400 | [diff] [blame] | 837 | ret = trace_seq_printf(s, "%ps() {\n", (void *)call->func); |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 838 | if (!ret) |
| 839 | return TRACE_TYPE_PARTIAL_LINE; |
| 840 | |
Frederic Weisbecker | b91facc | 2009-02-06 18:30:44 +0100 | [diff] [blame] | 841 | /* |
| 842 | * we already consumed the current entry to check the next one |
| 843 | * and see if this is a leaf. |
| 844 | */ |
| 845 | return TRACE_TYPE_NO_CONSUME; |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | static enum print_line_t |
Steven Rostedt | ac5f6c9 | 2009-03-19 11:29:23 -0400 | [diff] [blame] | 849 | print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s, |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 850 | int type, unsigned long addr, u32 flags) |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 851 | { |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 852 | struct fgraph_data *data = iter->private; |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 853 | struct trace_entry *ent = iter->ent; |
Steven Rostedt | ac5f6c9 | 2009-03-19 11:29:23 -0400 | [diff] [blame] | 854 | int cpu = iter->cpu; |
| 855 | int ret; |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 856 | |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 857 | /* Pid */ |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 858 | if (verif_pid(s, ent->pid, cpu, data) == TRACE_TYPE_PARTIAL_LINE) |
Steven Rostedt | 437f24fb | 2008-11-26 00:16:27 -0500 | [diff] [blame] | 859 | return TRACE_TYPE_PARTIAL_LINE; |
| 860 | |
Steven Rostedt | ac5f6c9 | 2009-03-19 11:29:23 -0400 | [diff] [blame] | 861 | if (type) { |
| 862 | /* Interrupt */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 863 | ret = print_graph_irq(iter, addr, type, cpu, ent->pid, flags); |
Steven Rostedt | ac5f6c9 | 2009-03-19 11:29:23 -0400 | [diff] [blame] | 864 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
| 865 | return TRACE_TYPE_PARTIAL_LINE; |
| 866 | } |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 867 | |
| 868 | /* Absolute time */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 869 | if (flags & TRACE_GRAPH_PRINT_ABS_TIME) { |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 870 | ret = print_graph_abs_time(iter->ts, s); |
| 871 | if (!ret) |
| 872 | return TRACE_TYPE_PARTIAL_LINE; |
| 873 | } |
| 874 | |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 875 | /* Cpu */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 876 | if (flags & TRACE_GRAPH_PRINT_CPU) { |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 877 | ret = print_graph_cpu(s, cpu); |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 878 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
| 879 | return TRACE_TYPE_PARTIAL_LINE; |
| 880 | } |
| 881 | |
| 882 | /* Proc */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 883 | if (flags & TRACE_GRAPH_PRINT_PROC) { |
Ingo Molnar | 00a8bf8 | 2009-02-19 13:01:37 +0100 | [diff] [blame] | 884 | ret = print_graph_proc(s, ent->pid); |
Frederic Weisbecker | 11e84ac | 2008-12-03 02:30:37 +0100 | [diff] [blame] | 885 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
| 886 | return TRACE_TYPE_PARTIAL_LINE; |
| 887 | |
| 888 | ret = trace_seq_printf(s, " | "); |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 889 | if (!ret) |
| 890 | return TRACE_TYPE_PARTIAL_LINE; |
| 891 | } |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 892 | |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 893 | /* Latency format */ |
| 894 | if (trace_flags & TRACE_ITER_LATENCY_FMT) { |
| 895 | ret = print_graph_lat_fmt(s, ent); |
| 896 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
| 897 | return TRACE_TYPE_PARTIAL_LINE; |
| 898 | } |
| 899 | |
Steven Rostedt | ac5f6c9 | 2009-03-19 11:29:23 -0400 | [diff] [blame] | 900 | return 0; |
| 901 | } |
| 902 | |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 903 | /* |
| 904 | * Entry check for irq code |
| 905 | * |
| 906 | * returns 1 if |
| 907 | * - we are inside irq code |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 908 | * - we just entered irq code |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 909 | * |
| 910 | * retunns 0 if |
| 911 | * - funcgraph-interrupts option is set |
| 912 | * - we are not inside irq code |
| 913 | */ |
| 914 | static int |
| 915 | check_irq_entry(struct trace_iterator *iter, u32 flags, |
| 916 | unsigned long addr, int depth) |
| 917 | { |
| 918 | int cpu = iter->cpu; |
Jiri Olsa | a9d6117 | 2010-09-24 17:41:02 +0200 | [diff] [blame] | 919 | int *depth_irq; |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 920 | struct fgraph_data *data = iter->private; |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 921 | |
Jiri Olsa | a9d6117 | 2010-09-24 17:41:02 +0200 | [diff] [blame] | 922 | /* |
| 923 | * If we are either displaying irqs, or we got called as |
| 924 | * a graph event and private data does not exist, |
| 925 | * then we bypass the irq check. |
| 926 | */ |
| 927 | if ((flags & TRACE_GRAPH_PRINT_IRQS) || |
| 928 | (!data)) |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 929 | return 0; |
| 930 | |
Jiri Olsa | a9d6117 | 2010-09-24 17:41:02 +0200 | [diff] [blame] | 931 | depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq); |
| 932 | |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 933 | /* |
| 934 | * We are inside the irq code |
| 935 | */ |
| 936 | if (*depth_irq >= 0) |
| 937 | return 1; |
| 938 | |
| 939 | if ((addr < (unsigned long)__irqentry_text_start) || |
| 940 | (addr >= (unsigned long)__irqentry_text_end)) |
| 941 | return 0; |
| 942 | |
| 943 | /* |
| 944 | * We are entering irq code. |
| 945 | */ |
| 946 | *depth_irq = depth; |
| 947 | return 1; |
| 948 | } |
| 949 | |
| 950 | /* |
| 951 | * Return check for irq code |
| 952 | * |
| 953 | * returns 1 if |
| 954 | * - we are inside irq code |
| 955 | * - we just left irq code |
| 956 | * |
| 957 | * returns 0 if |
| 958 | * - funcgraph-interrupts option is set |
| 959 | * - we are not inside irq code |
| 960 | */ |
| 961 | static int |
| 962 | check_irq_return(struct trace_iterator *iter, u32 flags, int depth) |
| 963 | { |
| 964 | int cpu = iter->cpu; |
Jiri Olsa | a9d6117 | 2010-09-24 17:41:02 +0200 | [diff] [blame] | 965 | int *depth_irq; |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 966 | struct fgraph_data *data = iter->private; |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 967 | |
Jiri Olsa | a9d6117 | 2010-09-24 17:41:02 +0200 | [diff] [blame] | 968 | /* |
| 969 | * If we are either displaying irqs, or we got called as |
| 970 | * a graph event and private data does not exist, |
| 971 | * then we bypass the irq check. |
| 972 | */ |
| 973 | if ((flags & TRACE_GRAPH_PRINT_IRQS) || |
| 974 | (!data)) |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 975 | return 0; |
| 976 | |
Jiri Olsa | a9d6117 | 2010-09-24 17:41:02 +0200 | [diff] [blame] | 977 | depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq); |
| 978 | |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 979 | /* |
| 980 | * We are not inside the irq code. |
| 981 | */ |
| 982 | if (*depth_irq == -1) |
| 983 | return 0; |
| 984 | |
| 985 | /* |
| 986 | * We are inside the irq code, and this is returning entry. |
| 987 | * Let's not trace it and clear the entry depth, since |
| 988 | * we are out of irq code. |
| 989 | * |
| 990 | * This condition ensures that we 'leave the irq code' once |
| 991 | * we are out of the entry depth. Thus protecting us from |
| 992 | * the RETURN entry loss. |
| 993 | */ |
| 994 | if (*depth_irq >= depth) { |
| 995 | *depth_irq = -1; |
| 996 | return 1; |
| 997 | } |
| 998 | |
| 999 | /* |
| 1000 | * We are inside the irq code, and this is not the entry. |
| 1001 | */ |
| 1002 | return 1; |
| 1003 | } |
| 1004 | |
Steven Rostedt | ac5f6c9 | 2009-03-19 11:29:23 -0400 | [diff] [blame] | 1005 | static enum print_line_t |
| 1006 | print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s, |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1007 | struct trace_iterator *iter, u32 flags) |
Steven Rostedt | ac5f6c9 | 2009-03-19 11:29:23 -0400 | [diff] [blame] | 1008 | { |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1009 | struct fgraph_data *data = iter->private; |
Steven Rostedt | ac5f6c9 | 2009-03-19 11:29:23 -0400 | [diff] [blame] | 1010 | struct ftrace_graph_ent *call = &field->graph_ent; |
| 1011 | struct ftrace_graph_ret_entry *leaf_ret; |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1012 | static enum print_line_t ret; |
| 1013 | int cpu = iter->cpu; |
Steven Rostedt | ac5f6c9 | 2009-03-19 11:29:23 -0400 | [diff] [blame] | 1014 | |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 1015 | if (check_irq_entry(iter, flags, call->func, call->depth)) |
| 1016 | return TRACE_TYPE_HANDLED; |
| 1017 | |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1018 | if (print_graph_prologue(iter, s, TRACE_GRAPH_ENT, call->func, flags)) |
Steven Rostedt | ac5f6c9 | 2009-03-19 11:29:23 -0400 | [diff] [blame] | 1019 | return TRACE_TYPE_PARTIAL_LINE; |
| 1020 | |
Frederic Weisbecker | b91facc | 2009-02-06 18:30:44 +0100 | [diff] [blame] | 1021 | leaf_ret = get_return_for_leaf(iter, field); |
| 1022 | if (leaf_ret) |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1023 | ret = print_graph_entry_leaf(iter, field, leaf_ret, s, flags); |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 1024 | else |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1025 | ret = print_graph_entry_nested(iter, field, s, cpu, flags); |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 1026 | |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1027 | if (data) { |
| 1028 | /* |
| 1029 | * If we failed to write our output, then we need to make |
| 1030 | * note of it. Because we already consumed our entry. |
| 1031 | */ |
| 1032 | if (s->full) { |
| 1033 | data->failed = 1; |
| 1034 | data->cpu = cpu; |
| 1035 | } else |
| 1036 | data->failed = 0; |
| 1037 | } |
| 1038 | |
| 1039 | return ret; |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 1040 | } |
| 1041 | |
| 1042 | static enum print_line_t |
| 1043 | print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s, |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1044 | struct trace_entry *ent, struct trace_iterator *iter, |
| 1045 | u32 flags) |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 1046 | { |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 1047 | unsigned long long duration = trace->rettime - trace->calltime; |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1048 | struct fgraph_data *data = iter->private; |
| 1049 | pid_t pid = ent->pid; |
| 1050 | int cpu = iter->cpu; |
Steven Rostedt | f1c7f51 | 2010-02-26 17:08:16 -0500 | [diff] [blame] | 1051 | int func_match = 1; |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1052 | int ret; |
| 1053 | int i; |
| 1054 | |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 1055 | if (check_irq_return(iter, flags, trace->depth)) |
| 1056 | return TRACE_TYPE_HANDLED; |
| 1057 | |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1058 | if (data) { |
Steven Rostedt | f1c7f51 | 2010-02-26 17:08:16 -0500 | [diff] [blame] | 1059 | struct fgraph_cpu_data *cpu_data; |
| 1060 | int cpu = iter->cpu; |
| 1061 | |
| 1062 | cpu_data = per_cpu_ptr(data->cpu_data, cpu); |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1063 | |
| 1064 | /* |
| 1065 | * Comments display at + 1 to depth. This is the |
| 1066 | * return from a function, we now want the comments |
| 1067 | * to display at the same level of the bracket. |
| 1068 | */ |
Steven Rostedt | f1c7f51 | 2010-02-26 17:08:16 -0500 | [diff] [blame] | 1069 | cpu_data->depth = trace->depth - 1; |
| 1070 | |
| 1071 | if (trace->depth < FTRACE_RETFUNC_DEPTH) { |
| 1072 | if (cpu_data->enter_funcs[trace->depth] != trace->func) |
| 1073 | func_match = 0; |
| 1074 | cpu_data->enter_funcs[trace->depth] = 0; |
| 1075 | } |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1076 | } |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 1077 | |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1078 | if (print_graph_prologue(iter, s, 0, 0, flags)) |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 1079 | return TRACE_TYPE_PARTIAL_LINE; |
| 1080 | |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 1081 | /* Overhead */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1082 | ret = print_graph_overhead(duration, s, flags); |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1083 | if (!ret) |
| 1084 | return TRACE_TYPE_PARTIAL_LINE; |
Frederic Weisbecker | 1a05615 | 2008-11-28 00:42:46 +0100 | [diff] [blame] | 1085 | |
| 1086 | /* Duration */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1087 | if (flags & TRACE_GRAPH_PRINT_DURATION) { |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1088 | ret = print_graph_duration(duration, s); |
| 1089 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
| 1090 | return TRACE_TYPE_PARTIAL_LINE; |
| 1091 | } |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 1092 | |
| 1093 | /* Closing brace */ |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 1094 | for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) { |
| 1095 | ret = trace_seq_printf(s, " "); |
| 1096 | if (!ret) |
| 1097 | return TRACE_TYPE_PARTIAL_LINE; |
| 1098 | } |
| 1099 | |
Steven Rostedt | f1c7f51 | 2010-02-26 17:08:16 -0500 | [diff] [blame] | 1100 | /* |
| 1101 | * If the return function does not have a matching entry, |
| 1102 | * then the entry was lost. Instead of just printing |
| 1103 | * the '}' and letting the user guess what function this |
| 1104 | * belongs to, write out the function name. |
| 1105 | */ |
| 1106 | if (func_match) { |
| 1107 | ret = trace_seq_printf(s, "}\n"); |
| 1108 | if (!ret) |
| 1109 | return TRACE_TYPE_PARTIAL_LINE; |
| 1110 | } else { |
Steven Rostedt | a094fe0 | 2010-03-05 20:08:58 -0500 | [diff] [blame] | 1111 | ret = trace_seq_printf(s, "} /* %ps */\n", (void *)trace->func); |
Steven Rostedt | f1c7f51 | 2010-02-26 17:08:16 -0500 | [diff] [blame] | 1112 | if (!ret) |
| 1113 | return TRACE_TYPE_PARTIAL_LINE; |
| 1114 | } |
Frederic Weisbecker | 83a8df6 | 2008-11-27 01:46:33 +0100 | [diff] [blame] | 1115 | |
| 1116 | /* Overrun */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1117 | if (flags & TRACE_GRAPH_PRINT_OVERRUN) { |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 1118 | ret = trace_seq_printf(s, " (Overruns: %lu)\n", |
| 1119 | trace->overrun); |
| 1120 | if (!ret) |
| 1121 | return TRACE_TYPE_PARTIAL_LINE; |
| 1122 | } |
Frederic Weisbecker | f8b755a | 2008-12-09 23:55:25 +0100 | [diff] [blame] | 1123 | |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1124 | ret = print_graph_irq(iter, trace->func, TRACE_GRAPH_RET, |
| 1125 | cpu, pid, flags); |
Frederic Weisbecker | f8b755a | 2008-12-09 23:55:25 +0100 | [diff] [blame] | 1126 | if (ret == TRACE_TYPE_PARTIAL_LINE) |
| 1127 | return TRACE_TYPE_PARTIAL_LINE; |
| 1128 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 1129 | return TRACE_TYPE_HANDLED; |
| 1130 | } |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1131 | |
Frederic Weisbecker | 1fd8f2a | 2008-12-03 23:45:11 +0100 | [diff] [blame] | 1132 | static enum print_line_t |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1133 | print_graph_comment(struct trace_seq *s, struct trace_entry *ent, |
| 1134 | struct trace_iterator *iter, u32 flags) |
Frederic Weisbecker | 1fd8f2a | 2008-12-03 23:45:11 +0100 | [diff] [blame] | 1135 | { |
Steven Rostedt | 5087f8d | 2009-03-19 15:14:46 -0400 | [diff] [blame] | 1136 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1137 | struct fgraph_data *data = iter->private; |
Steven Rostedt | 5087f8d | 2009-03-19 15:14:46 -0400 | [diff] [blame] | 1138 | struct trace_event *event; |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1139 | int depth = 0; |
Frederic Weisbecker | 1fd8f2a | 2008-12-03 23:45:11 +0100 | [diff] [blame] | 1140 | int ret; |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1141 | int i; |
| 1142 | |
| 1143 | if (data) |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1144 | depth = per_cpu_ptr(data->cpu_data, iter->cpu)->depth; |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1145 | |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1146 | if (print_graph_prologue(iter, s, 0, 0, flags)) |
Frederic Weisbecker | d1f9cbd | 2009-02-18 04:25:25 +0100 | [diff] [blame] | 1147 | return TRACE_TYPE_PARTIAL_LINE; |
| 1148 | |
Frederic Weisbecker | 1fd8f2a | 2008-12-03 23:45:11 +0100 | [diff] [blame] | 1149 | /* No overhead */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1150 | ret = print_graph_overhead(-1, s, flags); |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1151 | if (!ret) |
| 1152 | return TRACE_TYPE_PARTIAL_LINE; |
| 1153 | |
| 1154 | /* No time */ |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1155 | if (flags & TRACE_GRAPH_PRINT_DURATION) { |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1156 | ret = trace_seq_printf(s, " | "); |
Frederic Weisbecker | 1fd8f2a | 2008-12-03 23:45:11 +0100 | [diff] [blame] | 1157 | if (!ret) |
| 1158 | return TRACE_TYPE_PARTIAL_LINE; |
| 1159 | } |
| 1160 | |
Frederic Weisbecker | 1fd8f2a | 2008-12-03 23:45:11 +0100 | [diff] [blame] | 1161 | /* Indentation */ |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1162 | if (depth > 0) |
| 1163 | for (i = 0; i < (depth + 1) * TRACE_GRAPH_INDENT; i++) { |
Frederic Weisbecker | 1fd8f2a | 2008-12-03 23:45:11 +0100 | [diff] [blame] | 1164 | ret = trace_seq_printf(s, " "); |
| 1165 | if (!ret) |
| 1166 | return TRACE_TYPE_PARTIAL_LINE; |
| 1167 | } |
| 1168 | |
| 1169 | /* The comment */ |
Frederic Weisbecker | 769b044 | 2009-03-06 17:21:49 +0100 | [diff] [blame] | 1170 | ret = trace_seq_printf(s, "/* "); |
| 1171 | if (!ret) |
| 1172 | return TRACE_TYPE_PARTIAL_LINE; |
| 1173 | |
Steven Rostedt | 5087f8d | 2009-03-19 15:14:46 -0400 | [diff] [blame] | 1174 | switch (iter->ent->type) { |
| 1175 | case TRACE_BPRINT: |
| 1176 | ret = trace_print_bprintk_msg_only(iter); |
| 1177 | if (ret != TRACE_TYPE_HANDLED) |
| 1178 | return ret; |
| 1179 | break; |
| 1180 | case TRACE_PRINT: |
| 1181 | ret = trace_print_printk_msg_only(iter); |
| 1182 | if (ret != TRACE_TYPE_HANDLED) |
| 1183 | return ret; |
| 1184 | break; |
| 1185 | default: |
| 1186 | event = ftrace_find_event(ent->type); |
| 1187 | if (!event) |
| 1188 | return TRACE_TYPE_UNHANDLED; |
| 1189 | |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1190 | ret = event->funcs->trace(iter, sym_flags, event); |
Steven Rostedt | 5087f8d | 2009-03-19 15:14:46 -0400 | [diff] [blame] | 1191 | if (ret != TRACE_TYPE_HANDLED) |
| 1192 | return ret; |
| 1193 | } |
Frederic Weisbecker | 1fd8f2a | 2008-12-03 23:45:11 +0100 | [diff] [blame] | 1194 | |
Frederic Weisbecker | 412d0bb | 2008-12-24 01:43:25 +0100 | [diff] [blame] | 1195 | /* Strip ending newline */ |
| 1196 | if (s->buffer[s->len - 1] == '\n') { |
| 1197 | s->buffer[s->len - 1] = '\0'; |
| 1198 | s->len--; |
| 1199 | } |
| 1200 | |
Frederic Weisbecker | 1fd8f2a | 2008-12-03 23:45:11 +0100 | [diff] [blame] | 1201 | ret = trace_seq_printf(s, " */\n"); |
| 1202 | if (!ret) |
| 1203 | return TRACE_TYPE_PARTIAL_LINE; |
| 1204 | |
| 1205 | return TRACE_TYPE_HANDLED; |
| 1206 | } |
| 1207 | |
| 1208 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1209 | enum print_line_t |
Jiri Olsa | 0a77262 | 2010-09-23 14:00:52 +0200 | [diff] [blame] | 1210 | __print_graph_function_flags(struct trace_iterator *iter, u32 flags) |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1211 | { |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1212 | struct ftrace_graph_ent_entry *field; |
| 1213 | struct fgraph_data *data = iter->private; |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1214 | struct trace_entry *entry = iter->ent; |
Steven Rostedt | 5087f8d | 2009-03-19 15:14:46 -0400 | [diff] [blame] | 1215 | struct trace_seq *s = &iter->seq; |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1216 | int cpu = iter->cpu; |
| 1217 | int ret; |
| 1218 | |
| 1219 | if (data && per_cpu_ptr(data->cpu_data, cpu)->ignore) { |
| 1220 | per_cpu_ptr(data->cpu_data, cpu)->ignore = 0; |
| 1221 | return TRACE_TYPE_HANDLED; |
| 1222 | } |
| 1223 | |
| 1224 | /* |
| 1225 | * If the last output failed, there's a possibility we need |
| 1226 | * to print out the missing entry which would never go out. |
| 1227 | */ |
| 1228 | if (data && data->failed) { |
| 1229 | field = &data->ent; |
| 1230 | iter->cpu = data->cpu; |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1231 | ret = print_graph_entry(field, s, iter, flags); |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1232 | if (ret == TRACE_TYPE_HANDLED && iter->cpu != cpu) { |
| 1233 | per_cpu_ptr(data->cpu_data, iter->cpu)->ignore = 1; |
| 1234 | ret = TRACE_TYPE_NO_CONSUME; |
| 1235 | } |
| 1236 | iter->cpu = cpu; |
| 1237 | return ret; |
| 1238 | } |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1239 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 1240 | switch (entry->type) { |
| 1241 | case TRACE_GRAPH_ENT: { |
Lai Jiangshan | 38ceb59 | 2009-07-28 20:11:24 +0800 | [diff] [blame] | 1242 | /* |
| 1243 | * print_graph_entry() may consume the current event, |
| 1244 | * thus @field may become invalid, so we need to save it. |
| 1245 | * sizeof(struct ftrace_graph_ent_entry) is very small, |
| 1246 | * it can be safely saved at the stack. |
| 1247 | */ |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1248 | struct ftrace_graph_ent_entry saved; |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1249 | trace_assign_type(field, entry); |
Lai Jiangshan | 38ceb59 | 2009-07-28 20:11:24 +0800 | [diff] [blame] | 1250 | saved = *field; |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1251 | return print_graph_entry(&saved, s, iter, flags); |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1252 | } |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 1253 | case TRACE_GRAPH_RET: { |
| 1254 | struct ftrace_graph_ret_entry *field; |
| 1255 | trace_assign_type(field, entry); |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1256 | return print_graph_return(&field->ret, s, entry, iter, flags); |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 1257 | } |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 1258 | case TRACE_STACK: |
| 1259 | case TRACE_FN: |
| 1260 | /* dont trace stack and functions as comments */ |
| 1261 | return TRACE_TYPE_UNHANDLED; |
| 1262 | |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 1263 | default: |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1264 | return print_graph_comment(s, entry, iter, flags); |
Frederic Weisbecker | 287b6e6 | 2008-11-26 00:57:25 +0100 | [diff] [blame] | 1265 | } |
Steven Rostedt | 5087f8d | 2009-03-19 15:14:46 -0400 | [diff] [blame] | 1266 | |
| 1267 | return TRACE_TYPE_HANDLED; |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1268 | } |
| 1269 | |
Jiri Olsa | 9106b69 | 2010-04-02 19:01:20 +0200 | [diff] [blame] | 1270 | static enum print_line_t |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1271 | print_graph_function(struct trace_iterator *iter) |
| 1272 | { |
Jiri Olsa | 0a77262 | 2010-09-23 14:00:52 +0200 | [diff] [blame] | 1273 | return __print_graph_function_flags(iter, tracer_flags.val); |
| 1274 | } |
| 1275 | |
| 1276 | enum print_line_t print_graph_function_flags(struct trace_iterator *iter, |
| 1277 | u32 flags) |
| 1278 | { |
| 1279 | if (trace_flags & TRACE_ITER_LATENCY_FMT) |
| 1280 | flags |= TRACE_GRAPH_PRINT_DURATION; |
| 1281 | else |
| 1282 | flags |= TRACE_GRAPH_PRINT_ABS_TIME; |
| 1283 | |
| 1284 | return __print_graph_function_flags(iter, flags); |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1285 | } |
| 1286 | |
| 1287 | static enum print_line_t |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1288 | print_graph_function_event(struct trace_iterator *iter, int flags, |
| 1289 | struct trace_event *event) |
Jiri Olsa | 9106b69 | 2010-04-02 19:01:20 +0200 | [diff] [blame] | 1290 | { |
| 1291 | return print_graph_function(iter); |
| 1292 | } |
| 1293 | |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1294 | static void print_lat_header(struct seq_file *s, u32 flags) |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1295 | { |
| 1296 | static const char spaces[] = " " /* 16 spaces */ |
| 1297 | " " /* 4 spaces */ |
| 1298 | " "; /* 17 spaces */ |
| 1299 | int size = 0; |
| 1300 | |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1301 | if (flags & TRACE_GRAPH_PRINT_ABS_TIME) |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1302 | size += 16; |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1303 | if (flags & TRACE_GRAPH_PRINT_CPU) |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1304 | size += 4; |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1305 | if (flags & TRACE_GRAPH_PRINT_PROC) |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1306 | size += 17; |
| 1307 | |
| 1308 | seq_printf(s, "#%.*s _-----=> irqs-off \n", size, spaces); |
| 1309 | seq_printf(s, "#%.*s / _----=> need-resched \n", size, spaces); |
| 1310 | seq_printf(s, "#%.*s| / _---=> hardirq/softirq \n", size, spaces); |
| 1311 | seq_printf(s, "#%.*s|| / _--=> preempt-depth \n", size, spaces); |
Steven Rostedt | 637e7e8 | 2009-09-11 13:55:35 -0400 | [diff] [blame] | 1312 | seq_printf(s, "#%.*s||| / _-=> lock-depth \n", size, spaces); |
| 1313 | seq_printf(s, "#%.*s|||| / \n", size, spaces); |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1314 | } |
| 1315 | |
Jiri Olsa | 0a77262 | 2010-09-23 14:00:52 +0200 | [diff] [blame] | 1316 | static void __print_graph_headers_flags(struct seq_file *s, u32 flags) |
Frederic Weisbecker | decbec3 | 2008-12-08 01:56:06 +0100 | [diff] [blame] | 1317 | { |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1318 | int lat = trace_flags & TRACE_ITER_LATENCY_FMT; |
| 1319 | |
| 1320 | if (lat) |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1321 | print_lat_header(s, flags); |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1322 | |
Frederic Weisbecker | decbec3 | 2008-12-08 01:56:06 +0100 | [diff] [blame] | 1323 | /* 1st line */ |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1324 | seq_printf(s, "#"); |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1325 | if (flags & TRACE_GRAPH_PRINT_ABS_TIME) |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1326 | seq_printf(s, " TIME "); |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1327 | if (flags & TRACE_GRAPH_PRINT_CPU) |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1328 | seq_printf(s, " CPU"); |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1329 | if (flags & TRACE_GRAPH_PRINT_PROC) |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1330 | seq_printf(s, " TASK/PID "); |
| 1331 | if (lat) |
Steven Rostedt | 637e7e8 | 2009-09-11 13:55:35 -0400 | [diff] [blame] | 1332 | seq_printf(s, "|||||"); |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1333 | if (flags & TRACE_GRAPH_PRINT_DURATION) |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1334 | seq_printf(s, " DURATION "); |
| 1335 | seq_printf(s, " FUNCTION CALLS\n"); |
Frederic Weisbecker | decbec3 | 2008-12-08 01:56:06 +0100 | [diff] [blame] | 1336 | |
| 1337 | /* 2nd line */ |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1338 | seq_printf(s, "#"); |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1339 | if (flags & TRACE_GRAPH_PRINT_ABS_TIME) |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1340 | seq_printf(s, " | "); |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1341 | if (flags & TRACE_GRAPH_PRINT_CPU) |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1342 | seq_printf(s, " | "); |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1343 | if (flags & TRACE_GRAPH_PRINT_PROC) |
Steven Rostedt | 49ff590 | 2009-09-11 00:30:26 -0400 | [diff] [blame] | 1344 | seq_printf(s, " | | "); |
| 1345 | if (lat) |
Steven Rostedt | 637e7e8 | 2009-09-11 13:55:35 -0400 | [diff] [blame] | 1346 | seq_printf(s, "|||||"); |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1347 | if (flags & TRACE_GRAPH_PRINT_DURATION) |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1348 | seq_printf(s, " | | "); |
| 1349 | seq_printf(s, " | | | |\n"); |
Frederic Weisbecker | decbec3 | 2008-12-08 01:56:06 +0100 | [diff] [blame] | 1350 | } |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1351 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 1352 | void print_graph_headers(struct seq_file *s) |
Jiri Olsa | d7a8d9e | 2010-04-02 19:01:21 +0200 | [diff] [blame] | 1353 | { |
| 1354 | print_graph_headers_flags(s, tracer_flags.val); |
| 1355 | } |
| 1356 | |
Jiri Olsa | 0a77262 | 2010-09-23 14:00:52 +0200 | [diff] [blame] | 1357 | void print_graph_headers_flags(struct seq_file *s, u32 flags) |
| 1358 | { |
| 1359 | struct trace_iterator *iter = s->private; |
| 1360 | |
| 1361 | if (trace_flags & TRACE_ITER_LATENCY_FMT) { |
| 1362 | /* print nothing if the buffers are empty */ |
| 1363 | if (trace_empty(iter)) |
| 1364 | return; |
| 1365 | |
| 1366 | print_trace_header(s, iter); |
| 1367 | flags |= TRACE_GRAPH_PRINT_DURATION; |
| 1368 | } else |
| 1369 | flags |= TRACE_GRAPH_PRINT_ABS_TIME; |
| 1370 | |
| 1371 | __print_graph_headers_flags(s, flags); |
| 1372 | } |
| 1373 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 1374 | void graph_trace_open(struct trace_iterator *iter) |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1375 | { |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1376 | /* pid and depth on the last trace processed */ |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1377 | struct fgraph_data *data; |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1378 | int cpu; |
| 1379 | |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1380 | iter->private = NULL; |
| 1381 | |
| 1382 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1383 | if (!data) |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1384 | goto out_err; |
| 1385 | |
| 1386 | data->cpu_data = alloc_percpu(struct fgraph_cpu_data); |
| 1387 | if (!data->cpu_data) |
| 1388 | goto out_err_free; |
| 1389 | |
| 1390 | for_each_possible_cpu(cpu) { |
| 1391 | pid_t *pid = &(per_cpu_ptr(data->cpu_data, cpu)->last_pid); |
| 1392 | int *depth = &(per_cpu_ptr(data->cpu_data, cpu)->depth); |
| 1393 | int *ignore = &(per_cpu_ptr(data->cpu_data, cpu)->ignore); |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 1394 | int *depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq); |
| 1395 | |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1396 | *pid = -1; |
| 1397 | *depth = 0; |
| 1398 | *ignore = 0; |
Jiri Olsa | 2bd16212 | 2010-09-07 16:53:44 +0200 | [diff] [blame] | 1399 | *depth_irq = -1; |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1400 | } |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1401 | |
Steven Rostedt | 2fbcdb3 | 2009-03-19 13:24:42 -0400 | [diff] [blame] | 1402 | iter->private = data; |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1403 | |
| 1404 | return; |
| 1405 | |
| 1406 | out_err_free: |
| 1407 | kfree(data); |
| 1408 | out_err: |
| 1409 | pr_warning("function graph tracer: not enough memory\n"); |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1410 | } |
| 1411 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 1412 | void graph_trace_close(struct trace_iterator *iter) |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1413 | { |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1414 | struct fgraph_data *data = iter->private; |
| 1415 | |
| 1416 | if (data) { |
| 1417 | free_percpu(data->cpu_data); |
| 1418 | kfree(data); |
| 1419 | } |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1420 | } |
| 1421 | |
Steven Rostedt | b304d04 | 2010-09-14 18:58:33 -0400 | [diff] [blame] | 1422 | static int func_graph_set_flag(u32 old_flags, u32 bit, int set) |
| 1423 | { |
| 1424 | if (bit == TRACE_GRAPH_PRINT_IRQS) |
| 1425 | ftrace_graph_skip_irqs = !set; |
| 1426 | |
| 1427 | return 0; |
| 1428 | } |
| 1429 | |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1430 | static struct trace_event_functions graph_functions = { |
| 1431 | .trace = print_graph_function_event, |
| 1432 | }; |
| 1433 | |
Jiri Olsa | 9106b69 | 2010-04-02 19:01:20 +0200 | [diff] [blame] | 1434 | static struct trace_event graph_trace_entry_event = { |
| 1435 | .type = TRACE_GRAPH_ENT, |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1436 | .funcs = &graph_functions, |
Jiri Olsa | 9106b69 | 2010-04-02 19:01:20 +0200 | [diff] [blame] | 1437 | }; |
| 1438 | |
| 1439 | static struct trace_event graph_trace_ret_event = { |
| 1440 | .type = TRACE_GRAPH_RET, |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1441 | .funcs = &graph_functions |
Jiri Olsa | 9106b69 | 2010-04-02 19:01:20 +0200 | [diff] [blame] | 1442 | }; |
| 1443 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1444 | static struct tracer graph_trace __read_mostly = { |
Steven Rostedt | ef18012 | 2009-03-10 14:10:56 -0400 | [diff] [blame] | 1445 | .name = "function_graph", |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1446 | .open = graph_trace_open, |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1447 | .pipe_open = graph_trace_open, |
Frederic Weisbecker | 9005f3e | 2009-01-22 17:04:53 -0800 | [diff] [blame] | 1448 | .close = graph_trace_close, |
Jiri Olsa | be1eca3 | 2009-11-24 13:57:38 +0100 | [diff] [blame] | 1449 | .pipe_close = graph_trace_close, |
Frederic Weisbecker | 6eaaa5d | 2009-02-11 02:25:00 +0100 | [diff] [blame] | 1450 | .wait_pipe = poll_wait_pipe, |
Steven Rostedt | ef18012 | 2009-03-10 14:10:56 -0400 | [diff] [blame] | 1451 | .init = graph_trace_init, |
| 1452 | .reset = graph_trace_reset, |
Frederic Weisbecker | decbec3 | 2008-12-08 01:56:06 +0100 | [diff] [blame] | 1453 | .print_line = print_graph_function, |
| 1454 | .print_header = print_graph_headers, |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1455 | .flags = &tracer_flags, |
Steven Rostedt | b304d04 | 2010-09-14 18:58:33 -0400 | [diff] [blame] | 1456 | .set_flag = func_graph_set_flag, |
Frederic Weisbecker | 7447dce | 2009-02-07 21:33:57 +0100 | [diff] [blame] | 1457 | #ifdef CONFIG_FTRACE_SELFTEST |
| 1458 | .selftest = trace_selftest_startup_function_graph, |
| 1459 | #endif |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1460 | }; |
| 1461 | |
| 1462 | static __init int init_graph_trace(void) |
| 1463 | { |
Lai Jiangshan | 0c9e6f6 | 2009-07-28 20:26:06 +0800 | [diff] [blame] | 1464 | max_bytes_for_cpu = snprintf(NULL, 0, "%d", nr_cpu_ids - 1); |
| 1465 | |
Jiri Olsa | 9106b69 | 2010-04-02 19:01:20 +0200 | [diff] [blame] | 1466 | if (!register_ftrace_event(&graph_trace_entry_event)) { |
| 1467 | pr_warning("Warning: could not register graph trace events\n"); |
| 1468 | return 1; |
| 1469 | } |
| 1470 | |
| 1471 | if (!register_ftrace_event(&graph_trace_ret_event)) { |
| 1472 | pr_warning("Warning: could not register graph trace events\n"); |
| 1473 | return 1; |
| 1474 | } |
| 1475 | |
Frederic Weisbecker | fb52607 | 2008-11-25 21:07:04 +0100 | [diff] [blame] | 1476 | return register_tracer(&graph_trace); |
| 1477 | } |
| 1478 | |
| 1479 | device_initcall(init_graph_trace); |