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 |
Nadia Yvette Chambers | 6d49e35 | 2012-12-06 10:39:54 +0100 | [diff] [blame] | 10 | * Copyright (C) 2004 Nadia Yvette Chambers |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 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 | |
Thomas Gleixner | 5389f6f | 2009-07-25 17:13:33 +0200 | [diff] [blame] | 26 | static DEFINE_RAW_SPINLOCK(max_trace_lock); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 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 (Red Hat) | 613f04a | 2013-03-14 15:03:53 -0400 | [diff] [blame] | 35 | static int save_flags; |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 36 | static bool function_enabled; |
Steven Rostedt | e9d25fe | 2009-03-04 22:15:30 -0500 | [diff] [blame] | 37 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 38 | static void stop_irqsoff_tracer(struct trace_array *tr, int graph); |
| 39 | static int start_irqsoff_tracer(struct trace_array *tr, int graph); |
| 40 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 41 | #ifdef CONFIG_PREEMPT_TRACER |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 42 | static inline int |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 43 | preempt_trace(void) |
| 44 | { |
| 45 | return ((trace_type & TRACER_PREEMPT_OFF) && preempt_count()); |
| 46 | } |
| 47 | #else |
| 48 | # define preempt_trace() (0) |
| 49 | #endif |
| 50 | |
| 51 | #ifdef CONFIG_IRQSOFF_TRACER |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 52 | static inline int |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 53 | irq_trace(void) |
| 54 | { |
| 55 | return ((trace_type & TRACER_IRQS_OFF) && |
| 56 | irqs_disabled()); |
| 57 | } |
| 58 | #else |
| 59 | # define irq_trace() (0) |
| 60 | #endif |
| 61 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 62 | #define TRACE_DISPLAY_GRAPH 1 |
| 63 | |
| 64 | static struct tracer_opt trace_opts[] = { |
| 65 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 66 | /* display latency trace as call graph */ |
| 67 | { TRACER_OPT(display-graph, TRACE_DISPLAY_GRAPH) }, |
| 68 | #endif |
| 69 | { } /* Empty entry */ |
| 70 | }; |
| 71 | |
| 72 | static struct tracer_flags tracer_flags = { |
| 73 | .val = 0, |
| 74 | .opts = trace_opts, |
| 75 | }; |
| 76 | |
| 77 | #define is_graph() (tracer_flags.val & TRACE_DISPLAY_GRAPH) |
| 78 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 79 | /* |
| 80 | * Sequence count - we record it when starting a measurement and |
| 81 | * skip the latency if the sequence has changed - some other section |
| 82 | * did a maximum and could disturb our measurement with serial console |
| 83 | * printouts, etc. Truly coinciding maximum latencies should be rare |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 84 | * and what happens together happens separately as well, so this doesn't |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 85 | * decrease the validity of the maximum found: |
| 86 | */ |
| 87 | static __cacheline_aligned_in_smp unsigned long max_sequence; |
| 88 | |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 89 | #ifdef CONFIG_FUNCTION_TRACER |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 90 | /* |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 91 | * Prologue for the preempt and irqs off function tracers. |
| 92 | * |
| 93 | * Returns 1 if it is OK to continue, and data->disabled is |
| 94 | * incremented. |
| 95 | * 0 if the trace is to be ignored, and data->disabled |
| 96 | * is kept the same. |
| 97 | * |
| 98 | * Note, this function is also used outside this ifdef but |
| 99 | * inside the #ifdef of the function graph tracer below. |
| 100 | * This is OK, since the function graph tracer is |
| 101 | * dependent on the function tracer. |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 102 | */ |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 103 | static int func_prolog_dec(struct trace_array *tr, |
| 104 | struct trace_array_cpu **data, |
| 105 | unsigned long *flags) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 106 | { |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 107 | long disabled; |
| 108 | int cpu; |
| 109 | |
Steven Rostedt | 361943a | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 110 | /* |
| 111 | * Does not matter if we preempt. We test the flags |
| 112 | * afterward, to see if irqs are disabled or not. |
| 113 | * If we preempt and get a false positive, the flags |
| 114 | * test will fail. |
| 115 | */ |
| 116 | cpu = raw_smp_processor_id(); |
| 117 | if (likely(!per_cpu(tracing_cpu, cpu))) |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 118 | return 0; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 119 | |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 120 | local_save_flags(*flags); |
Steven Rostedt | 361943a | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 121 | /* slight chance to get a false positive on tracing_cpu */ |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 122 | if (!irqs_disabled_flags(*flags)) |
| 123 | return 0; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 124 | |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 125 | *data = per_cpu_ptr(tr->trace_buffer.data, cpu); |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 126 | disabled = atomic_inc_return(&(*data)->disabled); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 127 | |
| 128 | if (likely(disabled == 1)) |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 129 | return 1; |
| 130 | |
| 131 | atomic_dec(&(*data)->disabled); |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * irqsoff uses its own tracer function to keep the overhead down: |
| 138 | */ |
| 139 | static void |
Steven Rostedt | 2f5f6ad | 2011-08-08 16:57:47 -0400 | [diff] [blame] | 140 | irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip, |
Steven Rostedt | a1e2e31 | 2011-08-09 12:50:46 -0400 | [diff] [blame] | 141 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 142 | { |
| 143 | struct trace_array *tr = irqsoff_trace; |
| 144 | struct trace_array_cpu *data; |
| 145 | unsigned long flags; |
| 146 | |
| 147 | if (!func_prolog_dec(tr, &data, &flags)) |
| 148 | return; |
| 149 | |
| 150 | trace_function(tr, ip, parent_ip, flags, preempt_count()); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 151 | |
| 152 | atomic_dec(&data->disabled); |
| 153 | } |
| 154 | |
| 155 | static struct ftrace_ops trace_ops __read_mostly = |
| 156 | { |
| 157 | .func = irqsoff_tracer_call, |
Steven Rostedt | 4740974 | 2012-07-20 11:04:44 -0400 | [diff] [blame] | 158 | .flags = FTRACE_OPS_FL_GLOBAL | FTRACE_OPS_FL_RECURSION_SAFE, |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 159 | }; |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 160 | #endif /* CONFIG_FUNCTION_TRACER */ |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 161 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 162 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
Steven Rostedt (Red Hat) | 8c1a49a | 2014-01-10 11:13:54 -0500 | [diff] [blame] | 163 | static int |
| 164 | irqsoff_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 165 | { |
| 166 | int cpu; |
| 167 | |
| 168 | if (!(bit & TRACE_DISPLAY_GRAPH)) |
| 169 | return -EINVAL; |
| 170 | |
| 171 | if (!(is_graph() ^ set)) |
| 172 | return 0; |
| 173 | |
| 174 | stop_irqsoff_tracer(irqsoff_trace, !set); |
| 175 | |
| 176 | for_each_possible_cpu(cpu) |
| 177 | per_cpu(tracing_cpu, cpu) = 0; |
| 178 | |
| 179 | tracing_max_latency = 0; |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 180 | tracing_reset_online_cpus(&irqsoff_trace->trace_buffer); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 181 | |
| 182 | return start_irqsoff_tracer(irqsoff_trace, set); |
| 183 | } |
| 184 | |
| 185 | static int irqsoff_graph_entry(struct ftrace_graph_ent *trace) |
| 186 | { |
| 187 | struct trace_array *tr = irqsoff_trace; |
| 188 | struct trace_array_cpu *data; |
| 189 | unsigned long flags; |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 190 | int ret; |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 191 | int pc; |
| 192 | |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 193 | if (!func_prolog_dec(tr, &data, &flags)) |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 194 | return 0; |
| 195 | |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 196 | pc = preempt_count(); |
| 197 | ret = __trace_graph_entry(tr, trace, flags, pc); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 198 | atomic_dec(&data->disabled); |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 199 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 200 | return ret; |
| 201 | } |
| 202 | |
| 203 | static void irqsoff_graph_return(struct ftrace_graph_ret *trace) |
| 204 | { |
| 205 | struct trace_array *tr = irqsoff_trace; |
| 206 | struct trace_array_cpu *data; |
| 207 | unsigned long flags; |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 208 | int pc; |
| 209 | |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 210 | if (!func_prolog_dec(tr, &data, &flags)) |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 211 | return; |
| 212 | |
Steven Rostedt | 5e6d2b9 | 2010-10-05 19:41:43 -0400 | [diff] [blame] | 213 | pc = preempt_count(); |
| 214 | __trace_graph_return(tr, trace, flags, pc); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 215 | atomic_dec(&data->disabled); |
| 216 | } |
| 217 | |
| 218 | static void irqsoff_trace_open(struct trace_iterator *iter) |
| 219 | { |
| 220 | if (is_graph()) |
| 221 | graph_trace_open(iter); |
| 222 | |
| 223 | } |
| 224 | |
| 225 | static void irqsoff_trace_close(struct trace_iterator *iter) |
| 226 | { |
| 227 | if (iter->private) |
| 228 | graph_trace_close(iter); |
| 229 | } |
| 230 | |
| 231 | #define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_CPU | \ |
Jiri Olsa | 321e68b | 2011-06-03 16:58:47 +0200 | [diff] [blame] | 232 | TRACE_GRAPH_PRINT_PROC | \ |
| 233 | TRACE_GRAPH_PRINT_ABS_TIME | \ |
| 234 | TRACE_GRAPH_PRINT_DURATION) |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 235 | |
| 236 | static enum print_line_t irqsoff_print_line(struct trace_iterator *iter) |
| 237 | { |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 238 | /* |
| 239 | * In graph mode call the graph tracer output function, |
| 240 | * otherwise go with the TRACE_FN event handler |
| 241 | */ |
| 242 | if (is_graph()) |
Jiri Olsa | 0a77262 | 2010-09-23 14:00:52 +0200 | [diff] [blame] | 243 | return print_graph_function_flags(iter, GRAPH_TRACER_FLAGS); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 244 | |
| 245 | return TRACE_TYPE_UNHANDLED; |
| 246 | } |
| 247 | |
| 248 | static void irqsoff_print_header(struct seq_file *s) |
| 249 | { |
Jiri Olsa | 0a77262 | 2010-09-23 14:00:52 +0200 | [diff] [blame] | 250 | if (is_graph()) |
| 251 | print_graph_headers_flags(s, GRAPH_TRACER_FLAGS); |
| 252 | else |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 253 | trace_default_header(s); |
| 254 | } |
| 255 | |
| 256 | static void |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 257 | __trace_function(struct trace_array *tr, |
| 258 | unsigned long ip, unsigned long parent_ip, |
| 259 | unsigned long flags, int pc) |
| 260 | { |
Jiri Olsa | 0a77262 | 2010-09-23 14:00:52 +0200 | [diff] [blame] | 261 | if (is_graph()) |
| 262 | trace_graph_function(tr, ip, parent_ip, flags, pc); |
| 263 | else |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 264 | trace_function(tr, ip, parent_ip, flags, pc); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 265 | } |
| 266 | |
| 267 | #else |
| 268 | #define __trace_function trace_function |
| 269 | |
Steven Rostedt (Red Hat) | 8c1a49a | 2014-01-10 11:13:54 -0500 | [diff] [blame] | 270 | static int |
| 271 | irqsoff_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 272 | { |
| 273 | return -EINVAL; |
| 274 | } |
| 275 | |
| 276 | static int irqsoff_graph_entry(struct ftrace_graph_ent *trace) |
| 277 | { |
| 278 | return -1; |
| 279 | } |
| 280 | |
| 281 | static enum print_line_t irqsoff_print_line(struct trace_iterator *iter) |
| 282 | { |
| 283 | return TRACE_TYPE_UNHANDLED; |
| 284 | } |
| 285 | |
| 286 | static void irqsoff_graph_return(struct ftrace_graph_ret *trace) { } |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 287 | static void irqsoff_trace_open(struct trace_iterator *iter) { } |
| 288 | static void irqsoff_trace_close(struct trace_iterator *iter) { } |
Jiri Olsa | 7e9a49e | 2011-11-07 16:08:49 +0100 | [diff] [blame] | 289 | |
| 290 | #ifdef CONFIG_FUNCTION_TRACER |
| 291 | static void irqsoff_print_header(struct seq_file *s) |
| 292 | { |
| 293 | trace_default_header(s); |
| 294 | } |
| 295 | #else |
| 296 | static void irqsoff_print_header(struct seq_file *s) |
| 297 | { |
| 298 | trace_latency_header(s); |
| 299 | } |
| 300 | #endif /* CONFIG_FUNCTION_TRACER */ |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 301 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| 302 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 303 | /* |
| 304 | * Should this new latency be reported/recorded? |
| 305 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 306 | static int report_latency(cycle_t delta) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 307 | { |
| 308 | if (tracing_thresh) { |
| 309 | if (delta < tracing_thresh) |
| 310 | return 0; |
| 311 | } else { |
| 312 | if (delta <= tracing_max_latency) |
| 313 | return 0; |
| 314 | } |
| 315 | return 1; |
| 316 | } |
| 317 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 318 | static void |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 319 | check_critical_timing(struct trace_array *tr, |
| 320 | struct trace_array_cpu *data, |
| 321 | unsigned long parent_ip, |
| 322 | int cpu) |
| 323 | { |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 324 | cycle_t T0, T1, delta; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 325 | unsigned long flags; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 326 | int pc; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 327 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 328 | T0 = data->preempt_timestamp; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 329 | T1 = ftrace_now(cpu); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 330 | delta = T1-T0; |
| 331 | |
| 332 | local_save_flags(flags); |
| 333 | |
Steven Rostedt | 6450c1d | 2008-10-02 19:23:04 -0400 | [diff] [blame] | 334 | pc = preempt_count(); |
| 335 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 336 | if (!report_latency(delta)) |
| 337 | goto out; |
| 338 | |
Thomas Gleixner | 5389f6f | 2009-07-25 17:13:33 +0200 | [diff] [blame] | 339 | raw_spin_lock_irqsave(&max_trace_lock, flags); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 340 | |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 341 | /* check if we are still the max latency */ |
| 342 | if (!report_latency(delta)) |
| 343 | goto out_unlock; |
| 344 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 345 | __trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc); |
Steven Rostedt | cc51a0f | 2009-12-11 11:54:51 -0500 | [diff] [blame] | 346 | /* Skip 5 functions to get to the irq/preempt enable function */ |
| 347 | __trace_stack(tr, flags, 5, pc); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 348 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 349 | if (data->critical_sequence != max_sequence) |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 350 | goto out_unlock; |
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 | data->critical_end = parent_ip; |
| 353 | |
Carsten Emde | b5130b1 | 2009-09-13 01:43:07 +0200 | [diff] [blame] | 354 | if (likely(!is_tracing_stopped())) { |
| 355 | tracing_max_latency = delta; |
| 356 | update_max_tr_single(tr, current, cpu); |
| 357 | } |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 358 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 359 | max_sequence++; |
| 360 | |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 361 | out_unlock: |
Thomas Gleixner | 5389f6f | 2009-07-25 17:13:33 +0200 | [diff] [blame] | 362 | raw_spin_unlock_irqrestore(&max_trace_lock, flags); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 363 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 364 | out: |
| 365 | data->critical_sequence = max_sequence; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 366 | data->preempt_timestamp = ftrace_now(cpu); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 367 | __trace_function(tr, CALLER_ADDR0, parent_ip, flags, pc); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 368 | } |
| 369 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 370 | static inline void |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 371 | start_critical_timing(unsigned long ip, unsigned long parent_ip) |
| 372 | { |
| 373 | int cpu; |
| 374 | struct trace_array *tr = irqsoff_trace; |
| 375 | struct trace_array_cpu *data; |
| 376 | unsigned long flags; |
| 377 | |
Steven Rostedt (Red Hat) | 10246fa | 2013-07-01 15:58:24 -0400 | [diff] [blame] | 378 | if (!tracer_enabled || !tracing_is_enabled()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 379 | return; |
| 380 | |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 381 | cpu = raw_smp_processor_id(); |
| 382 | |
| 383 | if (per_cpu(tracing_cpu, cpu)) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 384 | return; |
| 385 | |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 386 | data = per_cpu_ptr(tr->trace_buffer.data, cpu); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 387 | |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 388 | if (unlikely(!data) || atomic_read(&data->disabled)) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 389 | return; |
| 390 | |
| 391 | atomic_inc(&data->disabled); |
| 392 | |
| 393 | data->critical_sequence = max_sequence; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 394 | data->preempt_timestamp = ftrace_now(cpu); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 395 | data->critical_start = parent_ip ? : ip; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 396 | |
| 397 | local_save_flags(flags); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 398 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 399 | __trace_function(tr, ip, parent_ip, flags, preempt_count()); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 400 | |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 401 | per_cpu(tracing_cpu, cpu) = 1; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 402 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 403 | atomic_dec(&data->disabled); |
| 404 | } |
| 405 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 406 | static inline void |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 407 | stop_critical_timing(unsigned long ip, unsigned long parent_ip) |
| 408 | { |
| 409 | int cpu; |
| 410 | struct trace_array *tr = irqsoff_trace; |
| 411 | struct trace_array_cpu *data; |
| 412 | unsigned long flags; |
| 413 | |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 414 | cpu = raw_smp_processor_id(); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 415 | /* Always clear the tracing cpu on stopping the trace */ |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 416 | if (unlikely(per_cpu(tracing_cpu, cpu))) |
| 417 | per_cpu(tracing_cpu, cpu) = 0; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 418 | else |
| 419 | return; |
| 420 | |
Steven Rostedt (Red Hat) | 10246fa | 2013-07-01 15:58:24 -0400 | [diff] [blame] | 421 | if (!tracer_enabled || !tracing_is_enabled()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 422 | return; |
| 423 | |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 424 | data = per_cpu_ptr(tr->trace_buffer.data, cpu); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 425 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 426 | if (unlikely(!data) || |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 427 | !data->critical_start || atomic_read(&data->disabled)) |
| 428 | return; |
| 429 | |
| 430 | atomic_inc(&data->disabled); |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 431 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 432 | local_save_flags(flags); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 433 | __trace_function(tr, ip, parent_ip, flags, preempt_count()); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 434 | check_critical_timing(tr, data, parent_ip ? : ip, cpu); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 435 | data->critical_start = 0; |
| 436 | atomic_dec(&data->disabled); |
| 437 | } |
| 438 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 439 | /* start and stop critical timings used to for stoppage (in idle) */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 440 | void start_critical_timings(void) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 441 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 442 | if (preempt_trace() || irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 443 | start_critical_timing(CALLER_ADDR0, CALLER_ADDR1); |
| 444 | } |
Ingo Molnar | 1fe3710 | 2008-07-26 15:09:47 +0200 | [diff] [blame] | 445 | EXPORT_SYMBOL_GPL(start_critical_timings); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 446 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 447 | void stop_critical_timings(void) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 448 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 449 | if (preempt_trace() || irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 450 | stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1); |
| 451 | } |
Ingo Molnar | 1fe3710 | 2008-07-26 15:09:47 +0200 | [diff] [blame] | 452 | EXPORT_SYMBOL_GPL(stop_critical_timings); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 453 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 454 | #ifdef CONFIG_IRQSOFF_TRACER |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 455 | #ifdef CONFIG_PROVE_LOCKING |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 456 | void time_hardirqs_on(unsigned long a0, unsigned long a1) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 457 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 458 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 459 | stop_critical_timing(a0, a1); |
| 460 | } |
| 461 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 462 | void time_hardirqs_off(unsigned long a0, unsigned long a1) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 463 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 464 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 465 | start_critical_timing(a0, a1); |
| 466 | } |
| 467 | |
| 468 | #else /* !CONFIG_PROVE_LOCKING */ |
| 469 | |
| 470 | /* |
| 471 | * Stubs: |
| 472 | */ |
| 473 | |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 474 | void trace_softirqs_on(unsigned long ip) |
| 475 | { |
| 476 | } |
| 477 | |
| 478 | void trace_softirqs_off(unsigned long ip) |
| 479 | { |
| 480 | } |
| 481 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 482 | inline void print_irqtrace_events(struct task_struct *curr) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 483 | { |
| 484 | } |
| 485 | |
| 486 | /* |
| 487 | * We are only interested in hardirq on/off events: |
| 488 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 489 | void trace_hardirqs_on(void) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 490 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 491 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 492 | stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1); |
| 493 | } |
| 494 | EXPORT_SYMBOL(trace_hardirqs_on); |
| 495 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 496 | void trace_hardirqs_off(void) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 497 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 498 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 499 | start_critical_timing(CALLER_ADDR0, CALLER_ADDR1); |
| 500 | } |
| 501 | EXPORT_SYMBOL(trace_hardirqs_off); |
| 502 | |
Andi Kleen | 285c00a | 2014-02-08 08:52:08 +0100 | [diff] [blame] | 503 | __visible void trace_hardirqs_on_caller(unsigned long caller_addr) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 504 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 505 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 506 | stop_critical_timing(CALLER_ADDR0, caller_addr); |
| 507 | } |
| 508 | EXPORT_SYMBOL(trace_hardirqs_on_caller); |
| 509 | |
Andi Kleen | 285c00a | 2014-02-08 08:52:08 +0100 | [diff] [blame] | 510 | __visible void trace_hardirqs_off_caller(unsigned long caller_addr) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 511 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 512 | if (!preempt_trace() && irq_trace()) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 513 | start_critical_timing(CALLER_ADDR0, caller_addr); |
| 514 | } |
| 515 | EXPORT_SYMBOL(trace_hardirqs_off_caller); |
| 516 | |
| 517 | #endif /* CONFIG_PROVE_LOCKING */ |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 518 | #endif /* CONFIG_IRQSOFF_TRACER */ |
| 519 | |
| 520 | #ifdef CONFIG_PREEMPT_TRACER |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 521 | void trace_preempt_on(unsigned long a0, unsigned long a1) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 522 | { |
Steven Rostedt | e36de1d | 2011-09-22 11:11:51 -0400 | [diff] [blame] | 523 | if (preempt_trace() && !irq_trace()) |
Steven Rostedt | 1e01cb0 | 2008-07-15 09:53:37 -0400 | [diff] [blame] | 524 | stop_critical_timing(a0, a1); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 525 | } |
| 526 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 527 | void trace_preempt_off(unsigned long a0, unsigned long a1) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 528 | { |
Steven Rostedt | e36de1d | 2011-09-22 11:11:51 -0400 | [diff] [blame] | 529 | if (preempt_trace() && !irq_trace()) |
Steven Rostedt | 1e01cb0 | 2008-07-15 09:53:37 -0400 | [diff] [blame] | 530 | start_critical_timing(a0, a1); |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 531 | } |
| 532 | #endif /* CONFIG_PREEMPT_TRACER */ |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 533 | |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 534 | static int register_irqsoff_function(int graph, int set) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 535 | { |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 536 | int ret; |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 537 | |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 538 | /* 'set' is set if TRACE_ITER_FUNCTION is about to be set */ |
| 539 | if (function_enabled || (!set && !(trace_flags & TRACE_ITER_FUNCTION))) |
| 540 | return 0; |
| 541 | |
| 542 | if (graph) |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 543 | ret = register_ftrace_graph(&irqsoff_graph_return, |
| 544 | &irqsoff_graph_entry); |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 545 | else |
| 546 | ret = register_ftrace_function(&trace_ops); |
| 547 | |
| 548 | if (!ret) |
| 549 | function_enabled = true; |
| 550 | |
| 551 | return ret; |
| 552 | } |
| 553 | |
| 554 | static void unregister_irqsoff_function(int graph) |
| 555 | { |
| 556 | if (!function_enabled) |
| 557 | return; |
| 558 | |
| 559 | if (graph) |
| 560 | unregister_ftrace_graph(); |
| 561 | else |
| 562 | unregister_ftrace_function(&trace_ops); |
| 563 | |
| 564 | function_enabled = false; |
| 565 | } |
| 566 | |
| 567 | static void irqsoff_function_set(int set) |
| 568 | { |
| 569 | if (set) |
| 570 | register_irqsoff_function(is_graph(), 1); |
| 571 | else |
| 572 | unregister_irqsoff_function(is_graph()); |
| 573 | } |
| 574 | |
Steven Rostedt (Red Hat) | bf6065b | 2014-01-10 17:51:01 -0500 | [diff] [blame] | 575 | static int irqsoff_flag_changed(struct trace_array *tr, u32 mask, int set) |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 576 | { |
Steven Rostedt (Red Hat) | bf6065b | 2014-01-10 17:51:01 -0500 | [diff] [blame] | 577 | struct tracer *tracer = tr->current_trace; |
| 578 | |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 579 | if (mask & TRACE_ITER_FUNCTION) |
| 580 | irqsoff_function_set(set); |
| 581 | |
| 582 | return trace_keep_overwrite(tracer, mask, set); |
| 583 | } |
| 584 | |
| 585 | static int start_irqsoff_tracer(struct trace_array *tr, int graph) |
| 586 | { |
| 587 | int ret; |
| 588 | |
| 589 | ret = register_irqsoff_function(graph, 0); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 590 | |
| 591 | if (!ret && tracing_is_enabled()) |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 592 | tracer_enabled = 1; |
Steven Rostedt | 94523e8 | 2009-01-22 11:18:06 -0500 | [diff] [blame] | 593 | else |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 594 | tracer_enabled = 0; |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 595 | |
| 596 | return ret; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 597 | } |
| 598 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 599 | static void stop_irqsoff_tracer(struct trace_array *tr, int graph) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 600 | { |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 601 | tracer_enabled = 0; |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 602 | |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 603 | unregister_irqsoff_function(graph); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 604 | } |
| 605 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 606 | static void __irqsoff_tracer_init(struct trace_array *tr) |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 607 | { |
Steven Rostedt (Red Hat) | 613f04a | 2013-03-14 15:03:53 -0400 | [diff] [blame] | 608 | save_flags = trace_flags; |
| 609 | |
| 610 | /* non overwrite screws up the latency tracers */ |
Steven Rostedt | 2b6080f | 2012-05-11 13:29:49 -0400 | [diff] [blame] | 611 | set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1); |
| 612 | set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, 1); |
Steven Rostedt | e9d25fe | 2009-03-04 22:15:30 -0500 | [diff] [blame] | 613 | |
Steven Rostedt | 745b162 | 2009-01-15 23:40:11 -0500 | [diff] [blame] | 614 | tracing_max_latency = 0; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 615 | irqsoff_trace = tr; |
Steven Rostedt | c5f888c | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 616 | /* make sure that the tracer is visible */ |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 617 | smp_wmb(); |
Steven Rostedt (Red Hat) | 12883ef | 2013-03-05 09:24:35 -0500 | [diff] [blame] | 618 | tracing_reset_online_cpus(&tr->trace_buffer); |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 619 | |
| 620 | if (start_irqsoff_tracer(tr, is_graph())) |
| 621 | printk(KERN_ERR "failed to start irqsoff tracer\n"); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | static void irqsoff_tracer_reset(struct trace_array *tr) |
| 625 | { |
Steven Rostedt (Red Hat) | 613f04a | 2013-03-14 15:03:53 -0400 | [diff] [blame] | 626 | int lat_flag = save_flags & TRACE_ITER_LATENCY_FMT; |
| 627 | int overwrite_flag = save_flags & TRACE_ITER_OVERWRITE; |
| 628 | |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 629 | stop_irqsoff_tracer(tr, is_graph()); |
Steven Rostedt | e9d25fe | 2009-03-04 22:15:30 -0500 | [diff] [blame] | 630 | |
Steven Rostedt | 2b6080f | 2012-05-11 13:29:49 -0400 | [diff] [blame] | 631 | set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag); |
| 632 | set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 633 | } |
| 634 | |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 635 | static void irqsoff_tracer_start(struct trace_array *tr) |
| 636 | { |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 637 | tracer_enabled = 1; |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 638 | } |
| 639 | |
| 640 | static void irqsoff_tracer_stop(struct trace_array *tr) |
| 641 | { |
| 642 | tracer_enabled = 0; |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 643 | } |
| 644 | |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 645 | #ifdef CONFIG_IRQSOFF_TRACER |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 646 | static int irqsoff_tracer_init(struct trace_array *tr) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 647 | { |
| 648 | trace_type = TRACER_IRQS_OFF; |
| 649 | |
| 650 | __irqsoff_tracer_init(tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 651 | return 0; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 652 | } |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 653 | static struct tracer irqsoff_tracer __read_mostly = |
| 654 | { |
| 655 | .name = "irqsoff", |
| 656 | .init = irqsoff_tracer_init, |
| 657 | .reset = irqsoff_tracer_reset, |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 658 | .start = irqsoff_tracer_start, |
| 659 | .stop = irqsoff_tracer_stop, |
Hiraku Toyooka | f43c738 | 2012-10-02 17:27:10 +0900 | [diff] [blame] | 660 | .print_max = true, |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 661 | .print_header = irqsoff_print_header, |
| 662 | .print_line = irqsoff_print_line, |
| 663 | .flags = &tracer_flags, |
| 664 | .set_flag = irqsoff_set_flag, |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 665 | .flag_changed = irqsoff_flag_changed, |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 666 | #ifdef CONFIG_FTRACE_SELFTEST |
| 667 | .selftest = trace_selftest_startup_irqsoff, |
| 668 | #endif |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 669 | .open = irqsoff_trace_open, |
| 670 | .close = irqsoff_trace_close, |
Hiraku Toyooka | f43c738 | 2012-10-02 17:27:10 +0900 | [diff] [blame] | 671 | .use_max_tr = true, |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 672 | }; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 673 | # define register_irqsoff(trace) register_tracer(&trace) |
| 674 | #else |
| 675 | # define register_irqsoff(trace) do { } while (0) |
| 676 | #endif |
| 677 | |
| 678 | #ifdef CONFIG_PREEMPT_TRACER |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 679 | static int preemptoff_tracer_init(struct trace_array *tr) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 680 | { |
| 681 | trace_type = TRACER_PREEMPT_OFF; |
| 682 | |
| 683 | __irqsoff_tracer_init(tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 684 | return 0; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 685 | } |
| 686 | |
| 687 | static struct tracer preemptoff_tracer __read_mostly = |
| 688 | { |
| 689 | .name = "preemptoff", |
| 690 | .init = preemptoff_tracer_init, |
| 691 | .reset = irqsoff_tracer_reset, |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 692 | .start = irqsoff_tracer_start, |
| 693 | .stop = irqsoff_tracer_stop, |
Hiraku Toyooka | f43c738 | 2012-10-02 17:27:10 +0900 | [diff] [blame] | 694 | .print_max = true, |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 695 | .print_header = irqsoff_print_header, |
| 696 | .print_line = irqsoff_print_line, |
| 697 | .flags = &tracer_flags, |
| 698 | .set_flag = irqsoff_set_flag, |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 699 | .flag_changed = irqsoff_flag_changed, |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 700 | #ifdef CONFIG_FTRACE_SELFTEST |
| 701 | .selftest = trace_selftest_startup_preemptoff, |
| 702 | #endif |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 703 | .open = irqsoff_trace_open, |
| 704 | .close = irqsoff_trace_close, |
Hiraku Toyooka | f43c738 | 2012-10-02 17:27:10 +0900 | [diff] [blame] | 705 | .use_max_tr = true, |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 706 | }; |
| 707 | # define register_preemptoff(trace) register_tracer(&trace) |
| 708 | #else |
| 709 | # define register_preemptoff(trace) do { } while (0) |
| 710 | #endif |
| 711 | |
| 712 | #if defined(CONFIG_IRQSOFF_TRACER) && \ |
| 713 | defined(CONFIG_PREEMPT_TRACER) |
| 714 | |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 715 | static int preemptirqsoff_tracer_init(struct trace_array *tr) |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 716 | { |
| 717 | trace_type = TRACER_IRQS_OFF | TRACER_PREEMPT_OFF; |
| 718 | |
| 719 | __irqsoff_tracer_init(tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 720 | return 0; |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 721 | } |
| 722 | |
| 723 | static struct tracer preemptirqsoff_tracer __read_mostly = |
| 724 | { |
| 725 | .name = "preemptirqsoff", |
| 726 | .init = preemptirqsoff_tracer_init, |
| 727 | .reset = irqsoff_tracer_reset, |
Steven Rostedt | 9036990 | 2008-11-05 16:05:44 -0500 | [diff] [blame] | 728 | .start = irqsoff_tracer_start, |
| 729 | .stop = irqsoff_tracer_stop, |
Hiraku Toyooka | f43c738 | 2012-10-02 17:27:10 +0900 | [diff] [blame] | 730 | .print_max = true, |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 731 | .print_header = irqsoff_print_header, |
| 732 | .print_line = irqsoff_print_line, |
| 733 | .flags = &tracer_flags, |
| 734 | .set_flag = irqsoff_set_flag, |
Steven Rostedt (Red Hat) | 328df47 | 2013-03-14 12:10:40 -0400 | [diff] [blame] | 735 | .flag_changed = irqsoff_flag_changed, |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 736 | #ifdef CONFIG_FTRACE_SELFTEST |
| 737 | .selftest = trace_selftest_startup_preemptirqsoff, |
| 738 | #endif |
Jiri Olsa | 62b915f | 2010-04-02 19:01:22 +0200 | [diff] [blame] | 739 | .open = irqsoff_trace_open, |
| 740 | .close = irqsoff_trace_close, |
Hiraku Toyooka | f43c738 | 2012-10-02 17:27:10 +0900 | [diff] [blame] | 741 | .use_max_tr = true, |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 742 | }; |
| 743 | |
| 744 | # define register_preemptirqsoff(trace) register_tracer(&trace) |
| 745 | #else |
| 746 | # define register_preemptirqsoff(trace) do { } while (0) |
| 747 | #endif |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 748 | |
| 749 | __init static int init_irqsoff_tracer(void) |
| 750 | { |
Steven Rostedt | 6cd8a4b | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 751 | register_irqsoff(irqsoff_tracer); |
| 752 | register_preemptoff(preemptoff_tracer); |
| 753 | register_preemptirqsoff(preemptirqsoff_tracer); |
Steven Rostedt | 81d68a9 | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 754 | |
| 755 | return 0; |
| 756 | } |
Steven Rostedt | 6f41567 | 2012-10-05 12:13:07 -0400 | [diff] [blame] | 757 | core_initcall(init_irqsoff_tracer); |