Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1 | /* |
Wenji Huang | 73d8b8b | 2009-02-17 01:10:02 -0500 | [diff] [blame] | 2 | * trace irqs off critical timings |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> |
| 5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
| 6 | * |
| 7 | * From code in the latency_tracer, that is: |
| 8 | * |
| 9 | * Copyright (C) 2004-2006 Ingo Molnar |
| 10 | * Copyright (C) 2004 William Lee Irwin III |
| 11 | */ |
| 12 | #include <linux/kallsyms.h> |
| 13 | #include <linux/debugfs.h> |
| 14 | #include <linux/uaccess.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/ftrace.h> |
| 17 | #include <linux/fs.h> |
| 18 | |
| 19 | #include "trace.h" |
| 20 | |
| 21 | static struct trace_array *irqsoff_trace __read_mostly; |
| 22 | static int tracer_enabled __read_mostly; |
| 23 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 24 | static DEFINE_PER_CPU(int, tracing_cpu); |
| 25 | |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 26 | static DEFINE_SPINLOCK(max_trace_lock); |
| 27 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 28 | enum { |
| 29 | TRACER_IRQS_OFF = (1 << 1), |
| 30 | TRACER_PREEMPT_OFF = (1 << 2), |
| 31 | }; |
| 32 | |
| 33 | static int trace_type __read_mostly; |
| 34 | |
Steven Rostedt | e9d25fe | 2009-03-04 22:15:30 -0500 | [diff] [blame] | 35 | static int save_lat_flag; |
| 36 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 37 | static void stop_irqsoff_tracer(struct trace_array *tr, int graph); |
| 38 | static int start_irqsoff_tracer(struct trace_array *tr, int graph); |
| 39 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 40 | #ifdef CONFIG_PREEMPT_TRACER |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 41 | static inline int |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 42 | preempt_trace(void) |
| 43 | { |
| 44 | return ((trace_type & TRACER_PREEMPT_OFF) && preempt_count()); |
| 45 | } |
| 46 | #else |
| 47 | # define preempt_trace() (0) |
| 48 | #endif |
| 49 | |
| 50 | #ifdef CONFIG_IRQSOFF_TRACER |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 51 | static inline int |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 52 | irq_trace(void) |
| 53 | { |
| 54 | return ((trace_type & TRACER_IRQS_OFF) && |
| 55 | irqs_disabled()); |
| 56 | } |
| 57 | #else |
| 58 | # define irq_trace() (0) |
| 59 | #endif |
| 60 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 61 | #define TRACE_DISPLAY_GRAPH 1 |
| 62 | |
| 63 | static struct tracer_opt trace_opts[] = { |
| 64 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 65 | /* display latency trace as call graph */ |
| 66 | { TRACER_OPT(display-graph, TRACE_DISPLAY_GRAPH) }, |
| 67 | #endif |
| 68 | { } /* Empty entry */ |
| 69 | }; |
| 70 | |
| 71 | static struct tracer_flags tracer_flags = { |
| 72 | .val = 0, |
| 73 | .opts = trace_opts, |
| 74 | }; |
| 75 | |
| 76 | #define is_graph() (tracer_flags.val & TRACE_DISPLAY_GRAPH) |
| 77 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 78 | /* |
| 79 | * Sequence count - we record it when starting a measurement and |
| 80 | * skip the latency if the sequence has changed - some other section |
| 81 | * did a maximum and could disturb our measurement with serial console |
| 82 | * printouts, etc. Truly coinciding maximum latencies should be rare |
| 83 | * and what happens together happens separately as well, so this doesnt |
| 84 | * decrease the validity of the maximum found: |
| 85 | */ |
| 86 | static __cacheline_aligned_in_smp unsigned long max_sequence; |
| 87 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 88 | #ifdef CONFIG_FUNCTION_TRACER |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 89 | /* |
| 90 | * irqsoff uses its own tracer function to keep the overhead down: |
| 91 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 92 | static void |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 93 | irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip) |
| 94 | { |
| 95 | struct trace_array *tr = irqsoff_trace; |
| 96 | struct trace_array_cpu *data; |
| 97 | unsigned long flags; |
| 98 | long disabled; |
| 99 | int cpu; |
| 100 | |
Steven Rostedt | 361943a | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 101 | /* |
| 102 | * Does not matter if we preempt. We test the flags |
| 103 | * afterward, to see if irqs are disabled or not. |
| 104 | * If we preempt and get a false positive, the flags |
| 105 | * test will fail. |
| 106 | */ |
| 107 | cpu = raw_smp_processor_id(); |
| 108 | if (likely(!per_cpu(tracing_cpu, cpu))) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 109 | return; |
| 110 | |
| 111 | local_save_flags(flags); |
Steven Rostedt | 361943a | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 112 | /* slight chance to get a false positive on tracing_cpu */ |
| 113 | if (!irqs_disabled_flags(flags)) |
| 114 | return; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 115 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 116 | data = tr->data[cpu]; |
| 117 | disabled = atomic_inc_return(&data->disabled); |
| 118 | |
| 119 | if (likely(disabled == 1)) |
Arnaldo Carvalho de Melo | 7be4215 | 2009-02-05 01:13:37 -0500 | [diff] [blame] | 120 | trace_function(tr, ip, parent_ip, flags, preempt_count()); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 121 | |
| 122 | atomic_dec(&data->disabled); |
| 123 | } |
| 124 | |
| 125 | static struct ftrace_ops trace_ops __read_mostly = |
| 126 | { |
| 127 | .func = irqsoff_tracer_call, |
| 128 | }; |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 129 | #endif /* CONFIG_FUNCTION_TRACER */ |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 130 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 131 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 132 | static int irqsoff_set_flag(u32 old_flags, u32 bit, int set) |
| 133 | { |
| 134 | int cpu; |
| 135 | |
| 136 | if (!(bit & TRACE_DISPLAY_GRAPH)) |
| 137 | return -EINVAL; |
| 138 | |
| 139 | if (!(is_graph() ^ set)) |
| 140 | return 0; |
| 141 | |
| 142 | stop_irqsoff_tracer(irqsoff_trace, !set); |
| 143 | |
| 144 | for_each_possible_cpu(cpu) |
| 145 | per_cpu(tracing_cpu, cpu) = 0; |
| 146 | |
| 147 | tracing_max_latency = 0; |
| 148 | tracing_reset_online_cpus(irqsoff_trace); |
| 149 | |
| 150 | return start_irqsoff_tracer(irqsoff_trace, set); |
| 151 | } |
| 152 | |
| 153 | static int irqsoff_graph_entry(struct ftrace_graph_ent *trace) |
| 154 | { |
| 155 | struct trace_array *tr = irqsoff_trace; |
| 156 | struct trace_array_cpu *data; |
| 157 | unsigned long flags; |
| 158 | long disabled; |
| 159 | int ret; |
| 160 | int cpu; |
| 161 | int pc; |
| 162 | |
| 163 | cpu = raw_smp_processor_id(); |
| 164 | if (likely(!per_cpu(tracing_cpu, cpu))) |
| 165 | return 0; |
| 166 | |
| 167 | local_save_flags(flags); |
| 168 | /* slight chance to get a false positive on tracing_cpu */ |
| 169 | if (!irqs_disabled_flags(flags)) |
| 170 | return 0; |
| 171 | |
| 172 | data = tr->data[cpu]; |
| 173 | disabled = atomic_inc_return(&data->disabled); |
| 174 | |
| 175 | if (likely(disabled == 1)) { |
| 176 | pc = preempt_count(); |
| 177 | ret = __trace_graph_entry(tr, trace, flags, pc); |
| 178 | } else |
| 179 | ret = 0; |
| 180 | |
| 181 | atomic_dec(&data->disabled); |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | static void irqsoff_graph_return(struct ftrace_graph_ret *trace) |
| 186 | { |
| 187 | struct trace_array *tr = irqsoff_trace; |
| 188 | struct trace_array_cpu *data; |
| 189 | unsigned long flags; |
| 190 | long disabled; |
| 191 | int cpu; |
| 192 | int pc; |
| 193 | |
| 194 | cpu = raw_smp_processor_id(); |
| 195 | if (likely(!per_cpu(tracing_cpu, cpu))) |
| 196 | return; |
| 197 | |
| 198 | local_save_flags(flags); |
| 199 | /* slight chance to get a false positive on tracing_cpu */ |
| 200 | if (!irqs_disabled_flags(flags)) |
| 201 | return; |
| 202 | |
| 203 | data = tr->data[cpu]; |
| 204 | disabled = atomic_inc_return(&data->disabled); |
| 205 | |
| 206 | if (likely(disabled == 1)) { |
| 207 | pc = preempt_count(); |
| 208 | __trace_graph_return(tr, trace, flags, pc); |
| 209 | } |
| 210 | |
| 211 | atomic_dec(&data->disabled); |
| 212 | } |
| 213 | |
| 214 | static void irqsoff_trace_open(struct trace_iterator *iter) |
| 215 | { |
| 216 | if (is_graph()) |
| 217 | graph_trace_open(iter); |
| 218 | |
| 219 | } |
| 220 | |
| 221 | static void irqsoff_trace_close(struct trace_iterator *iter) |
| 222 | { |
| 223 | if (iter->private) |
| 224 | graph_trace_close(iter); |
| 225 | } |
| 226 | |
| 227 | #define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_CPU | \ |
| 228 | TRACE_GRAPH_PRINT_PROC) |
| 229 | |
| 230 | static enum print_line_t irqsoff_print_line(struct trace_iterator *iter) |
| 231 | { |
| 232 | u32 flags = GRAPH_TRACER_FLAGS; |
| 233 | |
| 234 | if (trace_flags & TRACE_ITER_LATENCY_FMT) |
| 235 | flags |= TRACE_GRAPH_PRINT_DURATION; |
| 236 | else |
| 237 | flags |= TRACE_GRAPH_PRINT_ABS_TIME; |
| 238 | |
| 239 | /* |
| 240 | * In graph mode call the graph tracer output function, |
| 241 | * otherwise go with the TRACE_FN event handler |
| 242 | */ |
| 243 | if (is_graph()) |
| 244 | return print_graph_function_flags(iter, flags); |
| 245 | |
| 246 | return TRACE_TYPE_UNHANDLED; |
| 247 | } |
| 248 | |
| 249 | static void irqsoff_print_header(struct seq_file *s) |
| 250 | { |
| 251 | if (is_graph()) { |
| 252 | struct trace_iterator *iter = s->private; |
| 253 | u32 flags = GRAPH_TRACER_FLAGS; |
| 254 | |
| 255 | if (trace_flags & TRACE_ITER_LATENCY_FMT) { |
| 256 | /* print nothing if the buffers are empty */ |
| 257 | if (trace_empty(iter)) |
| 258 | return; |
| 259 | |
| 260 | print_trace_header(s, iter); |
| 261 | flags |= TRACE_GRAPH_PRINT_DURATION; |
| 262 | } else |
| 263 | flags |= TRACE_GRAPH_PRINT_ABS_TIME; |
| 264 | |
| 265 | print_graph_headers_flags(s, flags); |
| 266 | } else |
| 267 | trace_default_header(s); |
| 268 | } |
| 269 | |
| 270 | static void |
| 271 | trace_graph_function(struct trace_array *tr, |
| 272 | unsigned long ip, unsigned long flags, int pc) |
| 273 | { |
| 274 | u64 time = trace_clock_local(); |
| 275 | struct ftrace_graph_ent ent = { |
| 276 | .func = ip, |
| 277 | .depth = 0, |
| 278 | }; |
| 279 | struct ftrace_graph_ret ret = { |
| 280 | .func = ip, |
| 281 | .depth = 0, |
| 282 | .calltime = time, |
| 283 | .rettime = time, |
| 284 | }; |
| 285 | |
| 286 | __trace_graph_entry(tr, &ent, flags, pc); |
| 287 | __trace_graph_return(tr, &ret, flags, pc); |
| 288 | } |
| 289 | |
| 290 | static void |
| 291 | __trace_function(struct trace_array *tr, |
| 292 | unsigned long ip, unsigned long parent_ip, |
| 293 | unsigned long flags, int pc) |
| 294 | { |
| 295 | if (!is_graph()) |
| 296 | trace_function(tr, ip, parent_ip, flags, pc); |
| 297 | else { |
| 298 | trace_graph_function(tr, parent_ip, flags, pc); |
| 299 | trace_graph_function(tr, ip, flags, pc); |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | #else |
| 304 | #define __trace_function trace_function |
| 305 | |
| 306 | static int irqsoff_set_flag(u32 old_flags, u32 bit, int set) |
| 307 | { |
| 308 | return -EINVAL; |
| 309 | } |
| 310 | |
| 311 | static int irqsoff_graph_entry(struct ftrace_graph_ent *trace) |
| 312 | { |
| 313 | return -1; |
| 314 | } |
| 315 | |
| 316 | static enum print_line_t irqsoff_print_line(struct trace_iterator *iter) |
| 317 | { |
| 318 | return TRACE_TYPE_UNHANDLED; |
| 319 | } |
| 320 | |
| 321 | static void irqsoff_graph_return(struct ftrace_graph_ret *trace) { } |
| 322 | static void irqsoff_print_header(struct seq_file *s) { } |
| 323 | static void irqsoff_trace_open(struct trace_iterator *iter) { } |
| 324 | static void irqsoff_trace_close(struct trace_iterator *iter) { } |
| 325 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| 326 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 327 | /* |
| 328 | * Should this new latency be reported/recorded? |
| 329 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 330 | static int report_latency(cycle_t delta) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 331 | { |
| 332 | if (tracing_thresh) { |
| 333 | if (delta < tracing_thresh) |
| 334 | return 0; |
| 335 | } else { |
| 336 | if (delta <= tracing_max_latency) |
| 337 | return 0; |
| 338 | } |
| 339 | return 1; |
| 340 | } |
| 341 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 342 | static void |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 343 | check_critical_timing(struct trace_array *tr, |
| 344 | struct trace_array_cpu *data, |
| 345 | unsigned long parent_ip, |
| 346 | int cpu) |
| 347 | { |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 348 | cycle_t T0, T1, delta; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 349 | unsigned long flags; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 350 | int pc; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 351 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 352 | T0 = data->preempt_timestamp; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 353 | T1 = ftrace_now(cpu); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 354 | delta = T1-T0; |
| 355 | |
| 356 | local_save_flags(flags); |
| 357 | |
Steven Rostedt | 6450c1d | 2008-10-02 19:23:04 -0400 | [diff] [blame] | 358 | pc = preempt_count(); |
| 359 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 360 | if (!report_latency(delta)) |
| 361 | goto out; |
| 362 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 363 | spin_lock_irqsave(&max_trace_lock, flags); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 364 | |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 365 | /* check if we are still the max latency */ |
| 366 | if (!report_latency(delta)) |
| 367 | goto out_unlock; |
| 368 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 369 | __trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc); |
Steven Rostedt | cc51a0f | 2009-12-11 11:54:51 -0500 | [diff] [blame] | 370 | /* Skip 5 functions to get to the irq/preempt enable function */ |
| 371 | __trace_stack(tr, flags, 5, pc); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 372 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 373 | if (data->critical_sequence != max_sequence) |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 374 | goto out_unlock; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 375 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 376 | data->critical_end = parent_ip; |
| 377 | |
Carsten Emde | b5130b1 | 2009-09-13 01:43:07 +0200 | [diff] [blame] | 378 | if (likely(!is_tracing_stopped())) { |
| 379 | tracing_max_latency = delta; |
| 380 | update_max_tr_single(tr, current, cpu); |
| 381 | } |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 382 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 383 | max_sequence++; |
| 384 | |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 385 | out_unlock: |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 386 | spin_unlock_irqrestore(&max_trace_lock, flags); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 387 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 388 | out: |
| 389 | data->critical_sequence = max_sequence; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 390 | data->preempt_timestamp = ftrace_now(cpu); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 391 | __trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 392 | } |
| 393 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 394 | static inline void |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 395 | start_critical_timing(unsigned long ip, unsigned long parent_ip) |
| 396 | { |
| 397 | int cpu; |
| 398 | struct trace_array *tr = irqsoff_trace; |
| 399 | struct trace_array_cpu *data; |
| 400 | unsigned long flags; |
| 401 | |
| 402 | if (likely(!tracer_enabled)) |
| 403 | return; |
| 404 | |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 405 | cpu = raw_smp_processor_id(); |
| 406 | |
| 407 | if (per_cpu(tracing_cpu, cpu)) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 408 | return; |
| 409 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 410 | data = tr->data[cpu]; |
| 411 | |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 412 | if (unlikely(!data) || atomic_read(&data->disabled)) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 413 | return; |
| 414 | |
| 415 | atomic_inc(&data->disabled); |
| 416 | |
| 417 | data->critical_sequence = max_sequence; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 418 | data->preempt_timestamp = ftrace_now(cpu); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 419 | data->critical_start = parent_ip ? : ip; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 420 | |
| 421 | local_save_flags(flags); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 422 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 423 | __trace_function(tr, ip, parent_ip, flags, preempt_count()); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 424 | |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 425 | per_cpu(tracing_cpu, cpu) = 1; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 426 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 427 | atomic_dec(&data->disabled); |
| 428 | } |
| 429 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 430 | static inline void |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 431 | stop_critical_timing(unsigned long ip, unsigned long parent_ip) |
| 432 | { |
| 433 | int cpu; |
| 434 | struct trace_array *tr = irqsoff_trace; |
| 435 | struct trace_array_cpu *data; |
| 436 | unsigned long flags; |
| 437 | |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 438 | cpu = raw_smp_processor_id(); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 439 | /* Always clear the tracing cpu on stopping the trace */ |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 440 | if (unlikely(per_cpu(tracing_cpu, cpu))) |
| 441 | per_cpu(tracing_cpu, cpu) = 0; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 442 | else |
| 443 | return; |
| 444 | |
| 445 | if (!tracer_enabled) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 446 | return; |
| 447 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 448 | data = tr->data[cpu]; |
| 449 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 450 | if (unlikely(!data) || |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 451 | !data->critical_start || atomic_read(&data->disabled)) |
| 452 | return; |
| 453 | |
| 454 | atomic_inc(&data->disabled); |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 455 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 456 | local_save_flags(flags); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 457 | __trace_function(tr, ip, parent_ip, flags, preempt_count()); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 458 | check_critical_timing(tr, data, parent_ip ? : ip, cpu); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 459 | data->critical_start = 0; |
| 460 | atomic_dec(&data->disabled); |
| 461 | } |
| 462 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 463 | /* start and stop critical timings used to for stoppage (in idle) */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 464 | void start_critical_timings(void) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 465 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 466 | if (preempt_trace() || irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 467 | start_critical_timing(CALLER_ADDR0, CALLER_ADDR1); |
| 468 | } |
Ingo Molnar | 1fe3710 | 2008-07-26 15:09:47 +0200 | [diff] [blame] | 469 | EXPORT_SYMBOL_GPL(start_critical_timings); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 470 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 471 | void stop_critical_timings(void) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 472 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 473 | if (preempt_trace() || irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 474 | stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1); |
| 475 | } |
Ingo Molnar | 1fe3710 | 2008-07-26 15:09:47 +0200 | [diff] [blame] | 476 | EXPORT_SYMBOL_GPL(stop_critical_timings); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 477 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 478 | #ifdef CONFIG_IRQSOFF_TRACER |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 479 | #ifdef CONFIG_PROVE_LOCKING |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 480 | void time_hardirqs_on(unsigned long a0, unsigned long a1) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 481 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 482 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 483 | stop_critical_timing(a0, a1); |
| 484 | } |
| 485 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 486 | void time_hardirqs_off(unsigned long a0, unsigned long a1) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 487 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 488 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 489 | start_critical_timing(a0, a1); |
| 490 | } |
| 491 | |
| 492 | #else /* !CONFIG_PROVE_LOCKING */ |
| 493 | |
| 494 | /* |
| 495 | * Stubs: |
| 496 | */ |
| 497 | |
| 498 | void early_boot_irqs_off(void) |
| 499 | { |
| 500 | } |
| 501 | |
| 502 | void early_boot_irqs_on(void) |
| 503 | { |
| 504 | } |
| 505 | |
| 506 | void trace_softirqs_on(unsigned long ip) |
| 507 | { |
| 508 | } |
| 509 | |
| 510 | void trace_softirqs_off(unsigned long ip) |
| 511 | { |
| 512 | } |
| 513 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 514 | inline void print_irqtrace_events(struct task_struct *curr) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 515 | { |
| 516 | } |
| 517 | |
| 518 | /* |
| 519 | * We are only interested in hardirq on/off events: |
| 520 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 521 | void trace_hardirqs_on(void) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 522 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 523 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 524 | stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1); |
| 525 | } |
| 526 | EXPORT_SYMBOL(trace_hardirqs_on); |
| 527 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 528 | void trace_hardirqs_off(void) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 529 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 530 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 531 | start_critical_timing(CALLER_ADDR0, CALLER_ADDR1); |
| 532 | } |
| 533 | EXPORT_SYMBOL(trace_hardirqs_off); |
| 534 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 535 | void trace_hardirqs_on_caller(unsigned long caller_addr) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 536 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 537 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 538 | stop_critical_timing(CALLER_ADDR0, caller_addr); |
| 539 | } |
| 540 | EXPORT_SYMBOL(trace_hardirqs_on_caller); |
| 541 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 542 | void trace_hardirqs_off_caller(unsigned long caller_addr) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 543 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 544 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 545 | start_critical_timing(CALLER_ADDR0, caller_addr); |
| 546 | } |
| 547 | EXPORT_SYMBOL(trace_hardirqs_off_caller); |
| 548 | |
| 549 | #endif /* CONFIG_PROVE_LOCKING */ |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 550 | #endif /* CONFIG_IRQSOFF_TRACER */ |
| 551 | |
| 552 | #ifdef CONFIG_PREEMPT_TRACER |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 553 | void trace_preempt_on(unsigned long a0, unsigned long a1) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 554 | { |
Steven Rostedt | 1e01cb0 | 2008-07-15 09:53:37 -0400 | [diff] [blame] | 555 | if (preempt_trace()) |
| 556 | stop_critical_timing(a0, a1); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 557 | } |
| 558 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 559 | void trace_preempt_off(unsigned long a0, unsigned long a1) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 560 | { |
Steven Rostedt | 1e01cb0 | 2008-07-15 09:53:37 -0400 | [diff] [blame] | 561 | if (preempt_trace()) |
| 562 | start_critical_timing(a0, a1); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 563 | } |
| 564 | #endif /* CONFIG_PREEMPT_TRACER */ |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 565 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 566 | static int start_irqsoff_tracer(struct trace_array *tr, int graph) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 567 | { |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 568 | int ret = 0; |
| 569 | |
| 570 | if (!graph) |
| 571 | ret = register_ftrace_function(&trace_ops); |
| 572 | else |
| 573 | ret = register_ftrace_graph(&irqsoff_graph_return, |
| 574 | &irqsoff_graph_entry); |
| 575 | |
| 576 | if (!ret && tracing_is_enabled()) |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 577 | tracer_enabled = 1; |
Steven Rostedt | 94523e8 | 2009-01-22 11:18:06 -0500 | [diff] [blame] | 578 | else |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 579 | tracer_enabled = 0; |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 580 | |
| 581 | return ret; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 582 | } |
| 583 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 584 | static void stop_irqsoff_tracer(struct trace_array *tr, int graph) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 585 | { |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 586 | tracer_enabled = 0; |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 587 | |
| 588 | if (!graph) |
| 589 | unregister_ftrace_function(&trace_ops); |
| 590 | else |
| 591 | unregister_ftrace_graph(); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 592 | } |
| 593 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 594 | static void __irqsoff_tracer_init(struct trace_array *tr) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 595 | { |
Steven Rostedt | e9d25fe | 2009-03-04 22:15:30 -0500 | [diff] [blame] | 596 | save_lat_flag = trace_flags & TRACE_ITER_LATENCY_FMT; |
| 597 | trace_flags |= TRACE_ITER_LATENCY_FMT; |
| 598 | |
Steven Rostedt | 745b162 | 2009-01-15 23:40:11 -0500 | [diff] [blame] | 599 | tracing_max_latency = 0; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 600 | irqsoff_trace = tr; |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 601 | /* make sure that the tracer is visible */ |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 602 | smp_wmb(); |
Steven Rostedt | 2f26ebd | 2009-09-01 11:06:29 -0400 | [diff] [blame] | 603 | tracing_reset_online_cpus(tr); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 604 | |
| 605 | if (start_irqsoff_tracer(tr, is_graph())) |
| 606 | printk(KERN_ERR "failed to start irqsoff tracer\n"); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 607 | } |
| 608 | |
| 609 | static void irqsoff_tracer_reset(struct trace_array *tr) |
| 610 | { |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 611 | stop_irqsoff_tracer(tr, is_graph()); |
Steven Rostedt | e9d25fe | 2009-03-04 22:15:30 -0500 | [diff] [blame] | 612 | |
| 613 | if (!save_lat_flag) |
| 614 | trace_flags &= ~TRACE_ITER_LATENCY_FMT; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 615 | } |
| 616 | |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 617 | static void irqsoff_tracer_start(struct trace_array *tr) |
| 618 | { |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 619 | tracer_enabled = 1; |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 620 | } |
| 621 | |
| 622 | static void irqsoff_tracer_stop(struct trace_array *tr) |
| 623 | { |
| 624 | tracer_enabled = 0; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 625 | } |
| 626 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 627 | #ifdef CONFIG_IRQSOFF_TRACER |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 628 | static int irqsoff_tracer_init(struct trace_array *tr) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 629 | { |
| 630 | trace_type = TRACER_IRQS_OFF; |
| 631 | |
| 632 | __irqsoff_tracer_init(tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 633 | return 0; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 634 | } |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 635 | static struct tracer irqsoff_tracer __read_mostly = |
| 636 | { |
| 637 | .name = "irqsoff", |
| 638 | .init = irqsoff_tracer_init, |
| 639 | .reset = irqsoff_tracer_reset, |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 640 | .start = irqsoff_tracer_start, |
| 641 | .stop = irqsoff_tracer_stop, |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 642 | .print_max = 1, |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 643 | .print_header = irqsoff_print_header, |
| 644 | .print_line = irqsoff_print_line, |
| 645 | .flags = &tracer_flags, |
| 646 | .set_flag = irqsoff_set_flag, |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 647 | #ifdef CONFIG_FTRACE_SELFTEST |
| 648 | .selftest = trace_selftest_startup_irqsoff, |
| 649 | #endif |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 650 | .open = irqsoff_trace_open, |
| 651 | .close = irqsoff_trace_close, |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 652 | }; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 653 | # define register_irqsoff(trace) register_tracer(&trace) |
| 654 | #else |
| 655 | # define register_irqsoff(trace) do { } while (0) |
| 656 | #endif |
| 657 | |
| 658 | #ifdef CONFIG_PREEMPT_TRACER |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 659 | static int preemptoff_tracer_init(struct trace_array *tr) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 660 | { |
| 661 | trace_type = TRACER_PREEMPT_OFF; |
| 662 | |
| 663 | __irqsoff_tracer_init(tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 664 | return 0; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | static struct tracer preemptoff_tracer __read_mostly = |
| 668 | { |
| 669 | .name = "preemptoff", |
| 670 | .init = preemptoff_tracer_init, |
| 671 | .reset = irqsoff_tracer_reset, |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 672 | .start = irqsoff_tracer_start, |
| 673 | .stop = irqsoff_tracer_stop, |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 674 | .print_max = 1, |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 675 | .print_header = irqsoff_print_header, |
| 676 | .print_line = irqsoff_print_line, |
| 677 | .flags = &tracer_flags, |
| 678 | .set_flag = irqsoff_set_flag, |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 679 | #ifdef CONFIG_FTRACE_SELFTEST |
| 680 | .selftest = trace_selftest_startup_preemptoff, |
| 681 | #endif |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 682 | .open = irqsoff_trace_open, |
| 683 | .close = irqsoff_trace_close, |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 684 | }; |
| 685 | # define register_preemptoff(trace) register_tracer(&trace) |
| 686 | #else |
| 687 | # define register_preemptoff(trace) do { } while (0) |
| 688 | #endif |
| 689 | |
| 690 | #if defined(CONFIG_IRQSOFF_TRACER) && \ |
| 691 | defined(CONFIG_PREEMPT_TRACER) |
| 692 | |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 693 | static int preemptirqsoff_tracer_init(struct trace_array *tr) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 694 | { |
| 695 | trace_type = TRACER_IRQS_OFF | TRACER_PREEMPT_OFF; |
| 696 | |
| 697 | __irqsoff_tracer_init(tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 698 | return 0; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 699 | } |
| 700 | |
| 701 | static struct tracer preemptirqsoff_tracer __read_mostly = |
| 702 | { |
| 703 | .name = "preemptirqsoff", |
| 704 | .init = preemptirqsoff_tracer_init, |
| 705 | .reset = irqsoff_tracer_reset, |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 706 | .start = irqsoff_tracer_start, |
| 707 | .stop = irqsoff_tracer_stop, |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 708 | .print_max = 1, |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 709 | .print_header = irqsoff_print_header, |
| 710 | .print_line = irqsoff_print_line, |
| 711 | .flags = &tracer_flags, |
| 712 | .set_flag = irqsoff_set_flag, |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 713 | #ifdef CONFIG_FTRACE_SELFTEST |
| 714 | .selftest = trace_selftest_startup_preemptirqsoff, |
| 715 | #endif |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 716 | .open = irqsoff_trace_open, |
| 717 | .close = irqsoff_trace_close, |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 718 | }; |
| 719 | |
| 720 | # define register_preemptirqsoff(trace) register_tracer(&trace) |
| 721 | #else |
| 722 | # define register_preemptirqsoff(trace) do { } while (0) |
| 723 | #endif |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 724 | |
| 725 | __init static int init_irqsoff_tracer(void) |
| 726 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 727 | register_irqsoff(irqsoff_tracer); |
| 728 | register_preemptoff(preemptoff_tracer); |
| 729 | register_preemptirqsoff(preemptirqsoff_tracer); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 730 | |
| 731 | return 0; |
| 732 | } |
| 733 | device_initcall(init_irqsoff_tracer); |