Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1 | /* Include in trace.c */ |
| 2 | |
Steven Rostedt | 9cc26a2 | 2009-03-09 16:00:22 -0400 | [diff] [blame] | 3 | #include <linux/stringify.h> |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 4 | #include <linux/kthread.h> |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 5 | #include <linux/delay.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 6 | #include <linux/slab.h> |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 7 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 8 | static inline int trace_valid_entry(struct trace_entry *entry) |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 9 | { |
| 10 | switch (entry->type) { |
| 11 | case TRACE_FN: |
| 12 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 13 | case TRACE_WAKE: |
Steven Rostedt | 06fa75a | 2008-05-12 21:20:54 +0200 | [diff] [blame] | 14 | case TRACE_STACK: |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 15 | case TRACE_PRINT: |
Steven Rostedt | 06fa75a | 2008-05-12 21:20:54 +0200 | [diff] [blame] | 16 | case TRACE_SPECIAL: |
Steven Rostedt | 80e5ea4 | 2008-11-12 15:24:24 -0500 | [diff] [blame] | 17 | case TRACE_BRANCH: |
Frederic Weisbecker | 7447dce | 2009-02-07 21:33:57 +0100 | [diff] [blame] | 18 | case TRACE_GRAPH_ENT: |
| 19 | case TRACE_GRAPH_RET: |
K.Prasad | 0722db0 | 2009-06-01 23:46:40 +0530 | [diff] [blame] | 20 | case TRACE_KSYM: |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 21 | return 1; |
| 22 | } |
| 23 | return 0; |
| 24 | } |
| 25 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 26 | static int trace_test_buffer_cpu(struct trace_array *tr, int cpu) |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 27 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 28 | struct ring_buffer_event *event; |
| 29 | struct trace_entry *entry; |
Steven Rostedt | 4b3e3d2 | 2009-02-18 22:50:01 -0500 | [diff] [blame] | 30 | unsigned int loops = 0; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 31 | |
Steven Rostedt | 66a8cb9 | 2010-03-31 13:21:56 -0400 | [diff] [blame] | 32 | while ((event = ring_buffer_consume(tr->buffer, cpu, NULL, NULL))) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 33 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 34 | |
Steven Rostedt | 4b3e3d2 | 2009-02-18 22:50:01 -0500 | [diff] [blame] | 35 | /* |
| 36 | * The ring buffer is a size of trace_buf_size, if |
| 37 | * we loop more than the size, there's something wrong |
| 38 | * with the ring buffer. |
| 39 | */ |
| 40 | if (loops++ > trace_buf_size) { |
| 41 | printk(KERN_CONT ".. bad ring buffer "); |
| 42 | goto failed; |
| 43 | } |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 44 | if (!trace_valid_entry(entry)) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 45 | printk(KERN_CONT ".. invalid entry %d ", |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 46 | entry->type); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 47 | goto failed; |
| 48 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 49 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 50 | return 0; |
| 51 | |
| 52 | failed: |
Steven Rostedt | 08bafa0 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 53 | /* disable tracing */ |
| 54 | tracing_disabled = 1; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 55 | printk(KERN_CONT ".. corrupted trace buffer .. "); |
| 56 | return -1; |
| 57 | } |
| 58 | |
| 59 | /* |
| 60 | * Test the trace buffer to see if all the elements |
| 61 | * are still sane. |
| 62 | */ |
| 63 | static int trace_test_buffer(struct trace_array *tr, unsigned long *count) |
| 64 | { |
Steven Rostedt | 30afdcb | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 65 | unsigned long flags, cnt = 0; |
| 66 | int cpu, ret = 0; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 67 | |
Steven Rostedt | 30afdcb | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 68 | /* Don't allow flipping of max traces now */ |
Steven Rostedt | d51ad7a | 2008-11-15 15:48:29 -0500 | [diff] [blame] | 69 | local_irq_save(flags); |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 70 | arch_spin_lock(&ftrace_max_lock); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 71 | |
| 72 | cnt = ring_buffer_entries(tr->buffer); |
| 73 | |
Steven Rostedt | 0c5119c | 2009-02-18 18:33:57 -0500 | [diff] [blame] | 74 | /* |
| 75 | * The trace_test_buffer_cpu runs a while loop to consume all data. |
| 76 | * If the calling tracer is broken, and is constantly filling |
| 77 | * the buffer, this will run forever, and hard lock the box. |
| 78 | * We disable the ring buffer while we do this test to prevent |
| 79 | * a hard lock up. |
| 80 | */ |
| 81 | tracing_off(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 82 | for_each_possible_cpu(cpu) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 83 | ret = trace_test_buffer_cpu(tr, cpu); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 84 | if (ret) |
| 85 | break; |
| 86 | } |
Steven Rostedt | 0c5119c | 2009-02-18 18:33:57 -0500 | [diff] [blame] | 87 | tracing_on(); |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 88 | arch_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | d51ad7a | 2008-11-15 15:48:29 -0500 | [diff] [blame] | 89 | local_irq_restore(flags); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 90 | |
| 91 | if (count) |
| 92 | *count = cnt; |
| 93 | |
| 94 | return ret; |
| 95 | } |
| 96 | |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 97 | static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret) |
| 98 | { |
| 99 | printk(KERN_WARNING "Failed to init %s tracer, init returned %d\n", |
| 100 | trace->name, init_ret); |
| 101 | } |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 102 | #ifdef CONFIG_FUNCTION_TRACER |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 103 | |
| 104 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 105 | |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 106 | /* Test dynamic code modification and ftrace filters */ |
| 107 | int trace_selftest_startup_dynamic_tracing(struct tracer *trace, |
| 108 | struct trace_array *tr, |
| 109 | int (*func)(void)) |
| 110 | { |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 111 | int save_ftrace_enabled = ftrace_enabled; |
| 112 | int save_tracer_enabled = tracer_enabled; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 113 | unsigned long count; |
Steven Rostedt | 4e491d1 | 2008-05-14 23:49:44 -0400 | [diff] [blame] | 114 | char *func_name; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 115 | int ret; |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 116 | |
| 117 | /* The ftrace test PASSED */ |
| 118 | printk(KERN_CONT "PASSED\n"); |
| 119 | pr_info("Testing dynamic ftrace: "); |
| 120 | |
| 121 | /* enable tracing, and record the filter function */ |
| 122 | ftrace_enabled = 1; |
| 123 | tracer_enabled = 1; |
| 124 | |
| 125 | /* passed in by parameter to fool gcc from optimizing */ |
| 126 | func(); |
| 127 | |
Steven Rostedt | 4e491d1 | 2008-05-14 23:49:44 -0400 | [diff] [blame] | 128 | /* |
Wenji Huang | 73d8b8b | 2009-02-17 01:10:02 -0500 | [diff] [blame] | 129 | * Some archs *cough*PowerPC*cough* add characters to the |
Steven Rostedt | 4e491d1 | 2008-05-14 23:49:44 -0400 | [diff] [blame] | 130 | * start of the function names. We simply put a '*' to |
Wenji Huang | 73d8b8b | 2009-02-17 01:10:02 -0500 | [diff] [blame] | 131 | * accommodate them. |
Steven Rostedt | 4e491d1 | 2008-05-14 23:49:44 -0400 | [diff] [blame] | 132 | */ |
Steven Rostedt | 9cc26a2 | 2009-03-09 16:00:22 -0400 | [diff] [blame] | 133 | func_name = "*" __stringify(DYN_FTRACE_TEST_NAME); |
Steven Rostedt | 4e491d1 | 2008-05-14 23:49:44 -0400 | [diff] [blame] | 134 | |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 135 | /* filter only on our function */ |
Steven Rostedt | 4e491d1 | 2008-05-14 23:49:44 -0400 | [diff] [blame] | 136 | ftrace_set_filter(func_name, strlen(func_name), 1); |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 137 | |
| 138 | /* enable tracing */ |
Arnaldo Carvalho de Melo | b6f11df | 2009-02-05 18:02:00 -0200 | [diff] [blame] | 139 | ret = tracer_init(trace, tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 140 | if (ret) { |
| 141 | warn_failed_init_tracer(trace, ret); |
| 142 | goto out; |
| 143 | } |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 144 | |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 145 | /* Sleep for a 1/10 of a second */ |
| 146 | msleep(100); |
| 147 | |
| 148 | /* we should have nothing in the buffer */ |
| 149 | ret = trace_test_buffer(tr, &count); |
| 150 | if (ret) |
| 151 | goto out; |
| 152 | |
| 153 | if (count) { |
| 154 | ret = -1; |
| 155 | printk(KERN_CONT ".. filter did not filter .. "); |
| 156 | goto out; |
| 157 | } |
| 158 | |
| 159 | /* call our function again */ |
| 160 | func(); |
| 161 | |
| 162 | /* sleep again */ |
| 163 | msleep(100); |
| 164 | |
| 165 | /* stop the tracing. */ |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 166 | tracing_stop(); |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 167 | ftrace_enabled = 0; |
| 168 | |
| 169 | /* check the trace buffer */ |
| 170 | ret = trace_test_buffer(tr, &count); |
| 171 | trace->reset(tr); |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 172 | tracing_start(); |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 173 | |
| 174 | /* we should only have one item */ |
| 175 | if (!ret && count != 1) { |
Steven Rostedt | 06fa75a | 2008-05-12 21:20:54 +0200 | [diff] [blame] | 176 | printk(KERN_CONT ".. filter failed count=%ld ..", count); |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 177 | ret = -1; |
| 178 | goto out; |
| 179 | } |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 180 | |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 181 | out: |
| 182 | ftrace_enabled = save_ftrace_enabled; |
| 183 | tracer_enabled = save_tracer_enabled; |
| 184 | |
| 185 | /* Enable tracing on all functions again */ |
| 186 | ftrace_set_filter(NULL, 0, 1); |
| 187 | |
| 188 | return ret; |
| 189 | } |
| 190 | #else |
| 191 | # define trace_selftest_startup_dynamic_tracing(trace, tr, func) ({ 0; }) |
| 192 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
Ingo Molnar | e9a22d1 | 2009-03-13 11:54:40 +0100 | [diff] [blame] | 193 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 194 | /* |
| 195 | * Simple verification test of ftrace function tracer. |
| 196 | * Enable ftrace, sleep 1/10 second, and then read the trace |
| 197 | * buffer to see if all is in order. |
| 198 | */ |
| 199 | int |
| 200 | trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr) |
| 201 | { |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 202 | int save_ftrace_enabled = ftrace_enabled; |
| 203 | int save_tracer_enabled = tracer_enabled; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 204 | unsigned long count; |
| 205 | int ret; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 206 | |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 207 | /* make sure msleep has been recorded */ |
| 208 | msleep(1); |
| 209 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 210 | /* start the tracing */ |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 211 | ftrace_enabled = 1; |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 212 | tracer_enabled = 1; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 213 | |
Arnaldo Carvalho de Melo | b6f11df | 2009-02-05 18:02:00 -0200 | [diff] [blame] | 214 | ret = tracer_init(trace, tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 215 | if (ret) { |
| 216 | warn_failed_init_tracer(trace, ret); |
| 217 | goto out; |
| 218 | } |
| 219 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 220 | /* Sleep for a 1/10 of a second */ |
| 221 | msleep(100); |
| 222 | /* stop the tracing. */ |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 223 | tracing_stop(); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 224 | ftrace_enabled = 0; |
| 225 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 226 | /* check the trace buffer */ |
| 227 | ret = trace_test_buffer(tr, &count); |
| 228 | trace->reset(tr); |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 229 | tracing_start(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 230 | |
| 231 | if (!ret && !count) { |
| 232 | printk(KERN_CONT ".. no entries found .."); |
| 233 | ret = -1; |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 234 | goto out; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 235 | } |
| 236 | |
Steven Rostedt | 77a2b37 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 237 | ret = trace_selftest_startup_dynamic_tracing(trace, tr, |
| 238 | DYN_FTRACE_TEST_NAME); |
| 239 | |
| 240 | out: |
| 241 | ftrace_enabled = save_ftrace_enabled; |
| 242 | tracer_enabled = save_tracer_enabled; |
| 243 | |
Steven Rostedt | 4eebcc8 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 244 | /* kill ftrace totally if we failed */ |
| 245 | if (ret) |
| 246 | ftrace_kill(); |
| 247 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 248 | return ret; |
| 249 | } |
Steven Rostedt | 606576c | 2008-10-06 19:06:12 -0400 | [diff] [blame] | 250 | #endif /* CONFIG_FUNCTION_TRACER */ |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 251 | |
Frederic Weisbecker | 7447dce | 2009-02-07 21:33:57 +0100 | [diff] [blame] | 252 | |
| 253 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
Frederic Weisbecker | cf586b6 | 2009-03-22 05:04:35 +0100 | [diff] [blame] | 254 | |
| 255 | /* Maximum number of functions to trace before diagnosing a hang */ |
| 256 | #define GRAPH_MAX_FUNC_TEST 100000000 |
| 257 | |
Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 258 | static void |
| 259 | __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode); |
Frederic Weisbecker | cf586b6 | 2009-03-22 05:04:35 +0100 | [diff] [blame] | 260 | static unsigned int graph_hang_thresh; |
| 261 | |
| 262 | /* Wrap the real function entry probe to avoid possible hanging */ |
| 263 | static int trace_graph_entry_watchdog(struct ftrace_graph_ent *trace) |
| 264 | { |
| 265 | /* This is harmlessly racy, we want to approximately detect a hang */ |
| 266 | if (unlikely(++graph_hang_thresh > GRAPH_MAX_FUNC_TEST)) { |
| 267 | ftrace_graph_stop(); |
| 268 | printk(KERN_WARNING "BUG: Function graph tracer hang!\n"); |
| 269 | if (ftrace_dump_on_oops) |
Frederic Weisbecker | cecbca9 | 2010-04-18 19:08:41 +0200 | [diff] [blame] | 270 | __ftrace_dump(false, DUMP_ALL); |
Frederic Weisbecker | cf586b6 | 2009-03-22 05:04:35 +0100 | [diff] [blame] | 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | return trace_graph_entry(trace); |
| 275 | } |
| 276 | |
Frederic Weisbecker | 7447dce | 2009-02-07 21:33:57 +0100 | [diff] [blame] | 277 | /* |
| 278 | * Pretty much the same than for the function tracer from which the selftest |
| 279 | * has been borrowed. |
| 280 | */ |
| 281 | int |
| 282 | trace_selftest_startup_function_graph(struct tracer *trace, |
| 283 | struct trace_array *tr) |
| 284 | { |
| 285 | int ret; |
| 286 | unsigned long count; |
| 287 | |
Frederic Weisbecker | cf586b6 | 2009-03-22 05:04:35 +0100 | [diff] [blame] | 288 | /* |
| 289 | * Simulate the init() callback but we attach a watchdog callback |
| 290 | * to detect and recover from possible hangs |
| 291 | */ |
| 292 | tracing_reset_online_cpus(tr); |
Frederic Weisbecker | 1a0799a | 2009-07-29 18:59:58 +0200 | [diff] [blame] | 293 | set_graph_array(tr); |
Frederic Weisbecker | cf586b6 | 2009-03-22 05:04:35 +0100 | [diff] [blame] | 294 | ret = register_ftrace_graph(&trace_graph_return, |
| 295 | &trace_graph_entry_watchdog); |
Frederic Weisbecker | 7447dce | 2009-02-07 21:33:57 +0100 | [diff] [blame] | 296 | if (ret) { |
| 297 | warn_failed_init_tracer(trace, ret); |
| 298 | goto out; |
| 299 | } |
Frederic Weisbecker | cf586b6 | 2009-03-22 05:04:35 +0100 | [diff] [blame] | 300 | tracing_start_cmdline_record(); |
Frederic Weisbecker | 7447dce | 2009-02-07 21:33:57 +0100 | [diff] [blame] | 301 | |
| 302 | /* Sleep for a 1/10 of a second */ |
| 303 | msleep(100); |
| 304 | |
Frederic Weisbecker | cf586b6 | 2009-03-22 05:04:35 +0100 | [diff] [blame] | 305 | /* Have we just recovered from a hang? */ |
| 306 | if (graph_hang_thresh > GRAPH_MAX_FUNC_TEST) { |
Frederic Weisbecker | 0cf53ff | 2009-03-22 15:13:07 +0100 | [diff] [blame] | 307 | tracing_selftest_disabled = true; |
Frederic Weisbecker | cf586b6 | 2009-03-22 05:04:35 +0100 | [diff] [blame] | 308 | ret = -1; |
| 309 | goto out; |
| 310 | } |
| 311 | |
Frederic Weisbecker | 7447dce | 2009-02-07 21:33:57 +0100 | [diff] [blame] | 312 | tracing_stop(); |
| 313 | |
| 314 | /* check the trace buffer */ |
| 315 | ret = trace_test_buffer(tr, &count); |
| 316 | |
| 317 | trace->reset(tr); |
| 318 | tracing_start(); |
| 319 | |
| 320 | if (!ret && !count) { |
| 321 | printk(KERN_CONT ".. no entries found .."); |
| 322 | ret = -1; |
| 323 | goto out; |
| 324 | } |
| 325 | |
| 326 | /* Don't test dynamic tracing, the function tracer already did */ |
| 327 | |
| 328 | out: |
| 329 | /* Stop it if we failed */ |
| 330 | if (ret) |
| 331 | ftrace_graph_stop(); |
| 332 | |
| 333 | return ret; |
| 334 | } |
| 335 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| 336 | |
| 337 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 338 | #ifdef CONFIG_IRQSOFF_TRACER |
| 339 | int |
| 340 | trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr) |
| 341 | { |
| 342 | unsigned long save_max = tracing_max_latency; |
| 343 | unsigned long count; |
| 344 | int ret; |
| 345 | |
| 346 | /* start the tracing */ |
Arnaldo Carvalho de Melo | b6f11df | 2009-02-05 18:02:00 -0200 | [diff] [blame] | 347 | ret = tracer_init(trace, tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 348 | if (ret) { |
| 349 | warn_failed_init_tracer(trace, ret); |
| 350 | return ret; |
| 351 | } |
| 352 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 353 | /* reset the max latency */ |
| 354 | tracing_max_latency = 0; |
| 355 | /* disable interrupts for a bit */ |
| 356 | local_irq_disable(); |
| 357 | udelay(100); |
| 358 | local_irq_enable(); |
Frederic Weisbecker | 4903620 | 2009-03-17 22:38:58 +0100 | [diff] [blame] | 359 | |
| 360 | /* |
| 361 | * Stop the tracer to avoid a warning subsequent |
| 362 | * to buffer flipping failure because tracing_stop() |
| 363 | * disables the tr and max buffers, making flipping impossible |
| 364 | * in case of parallels max irqs off latencies. |
| 365 | */ |
| 366 | trace->stop(tr); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 367 | /* stop the tracing. */ |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 368 | tracing_stop(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 369 | /* check both trace buffers */ |
| 370 | ret = trace_test_buffer(tr, NULL); |
| 371 | if (!ret) |
| 372 | ret = trace_test_buffer(&max_tr, &count); |
| 373 | trace->reset(tr); |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 374 | tracing_start(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 375 | |
| 376 | if (!ret && !count) { |
| 377 | printk(KERN_CONT ".. no entries found .."); |
| 378 | ret = -1; |
| 379 | } |
| 380 | |
| 381 | tracing_max_latency = save_max; |
| 382 | |
| 383 | return ret; |
| 384 | } |
| 385 | #endif /* CONFIG_IRQSOFF_TRACER */ |
| 386 | |
| 387 | #ifdef CONFIG_PREEMPT_TRACER |
| 388 | int |
| 389 | trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr) |
| 390 | { |
| 391 | unsigned long save_max = tracing_max_latency; |
| 392 | unsigned long count; |
| 393 | int ret; |
| 394 | |
Steven Rostedt | 769c48e | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 395 | /* |
| 396 | * Now that the big kernel lock is no longer preemptable, |
| 397 | * and this is called with the BKL held, it will always |
| 398 | * fail. If preemption is already disabled, simply |
| 399 | * pass the test. When the BKL is removed, or becomes |
| 400 | * preemptible again, we will once again test this, |
| 401 | * so keep it in. |
| 402 | */ |
| 403 | if (preempt_count()) { |
| 404 | printk(KERN_CONT "can not test ... force "); |
| 405 | return 0; |
| 406 | } |
| 407 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 408 | /* start the tracing */ |
Arnaldo Carvalho de Melo | b6f11df | 2009-02-05 18:02:00 -0200 | [diff] [blame] | 409 | ret = tracer_init(trace, tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 410 | if (ret) { |
| 411 | warn_failed_init_tracer(trace, ret); |
| 412 | return ret; |
| 413 | } |
| 414 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 415 | /* reset the max latency */ |
| 416 | tracing_max_latency = 0; |
| 417 | /* disable preemption for a bit */ |
| 418 | preempt_disable(); |
| 419 | udelay(100); |
| 420 | preempt_enable(); |
Frederic Weisbecker | 4903620 | 2009-03-17 22:38:58 +0100 | [diff] [blame] | 421 | |
| 422 | /* |
| 423 | * Stop the tracer to avoid a warning subsequent |
| 424 | * to buffer flipping failure because tracing_stop() |
| 425 | * disables the tr and max buffers, making flipping impossible |
| 426 | * in case of parallels max preempt off latencies. |
| 427 | */ |
| 428 | trace->stop(tr); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 429 | /* stop the tracing. */ |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 430 | tracing_stop(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 431 | /* check both trace buffers */ |
| 432 | ret = trace_test_buffer(tr, NULL); |
| 433 | if (!ret) |
| 434 | ret = trace_test_buffer(&max_tr, &count); |
| 435 | trace->reset(tr); |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 436 | tracing_start(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 437 | |
| 438 | if (!ret && !count) { |
| 439 | printk(KERN_CONT ".. no entries found .."); |
| 440 | ret = -1; |
| 441 | } |
| 442 | |
| 443 | tracing_max_latency = save_max; |
| 444 | |
| 445 | return ret; |
| 446 | } |
| 447 | #endif /* CONFIG_PREEMPT_TRACER */ |
| 448 | |
| 449 | #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER) |
| 450 | int |
| 451 | trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *tr) |
| 452 | { |
| 453 | unsigned long save_max = tracing_max_latency; |
| 454 | unsigned long count; |
| 455 | int ret; |
| 456 | |
Steven Rostedt | 769c48e | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 457 | /* |
| 458 | * Now that the big kernel lock is no longer preemptable, |
| 459 | * and this is called with the BKL held, it will always |
| 460 | * fail. If preemption is already disabled, simply |
| 461 | * pass the test. When the BKL is removed, or becomes |
| 462 | * preemptible again, we will once again test this, |
| 463 | * so keep it in. |
| 464 | */ |
| 465 | if (preempt_count()) { |
| 466 | printk(KERN_CONT "can not test ... force "); |
| 467 | return 0; |
| 468 | } |
| 469 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 470 | /* start the tracing */ |
Arnaldo Carvalho de Melo | b6f11df | 2009-02-05 18:02:00 -0200 | [diff] [blame] | 471 | ret = tracer_init(trace, tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 472 | if (ret) { |
| 473 | warn_failed_init_tracer(trace, ret); |
Frederic Weisbecker | ac1d52d | 2009-03-16 00:32:41 +0100 | [diff] [blame] | 474 | goto out_no_start; |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 475 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 476 | |
| 477 | /* reset the max latency */ |
| 478 | tracing_max_latency = 0; |
| 479 | |
| 480 | /* disable preemption and interrupts for a bit */ |
| 481 | preempt_disable(); |
| 482 | local_irq_disable(); |
| 483 | udelay(100); |
| 484 | preempt_enable(); |
| 485 | /* reverse the order of preempt vs irqs */ |
| 486 | local_irq_enable(); |
| 487 | |
Frederic Weisbecker | 4903620 | 2009-03-17 22:38:58 +0100 | [diff] [blame] | 488 | /* |
| 489 | * Stop the tracer to avoid a warning subsequent |
| 490 | * to buffer flipping failure because tracing_stop() |
| 491 | * disables the tr and max buffers, making flipping impossible |
| 492 | * in case of parallels max irqs/preempt off latencies. |
| 493 | */ |
| 494 | trace->stop(tr); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 495 | /* stop the tracing. */ |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 496 | tracing_stop(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 497 | /* check both trace buffers */ |
| 498 | ret = trace_test_buffer(tr, NULL); |
Frederic Weisbecker | ac1d52d | 2009-03-16 00:32:41 +0100 | [diff] [blame] | 499 | if (ret) |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 500 | goto out; |
| 501 | |
| 502 | ret = trace_test_buffer(&max_tr, &count); |
Frederic Weisbecker | ac1d52d | 2009-03-16 00:32:41 +0100 | [diff] [blame] | 503 | if (ret) |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 504 | goto out; |
| 505 | |
| 506 | if (!ret && !count) { |
| 507 | printk(KERN_CONT ".. no entries found .."); |
| 508 | ret = -1; |
| 509 | goto out; |
| 510 | } |
| 511 | |
| 512 | /* do the test by disabling interrupts first this time */ |
| 513 | tracing_max_latency = 0; |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 514 | tracing_start(); |
Frederic Weisbecker | 4903620 | 2009-03-17 22:38:58 +0100 | [diff] [blame] | 515 | trace->start(tr); |
| 516 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 517 | preempt_disable(); |
| 518 | local_irq_disable(); |
| 519 | udelay(100); |
| 520 | preempt_enable(); |
| 521 | /* reverse the order of preempt vs irqs */ |
| 522 | local_irq_enable(); |
| 523 | |
Frederic Weisbecker | 4903620 | 2009-03-17 22:38:58 +0100 | [diff] [blame] | 524 | trace->stop(tr); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 525 | /* stop the tracing. */ |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 526 | tracing_stop(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 527 | /* check both trace buffers */ |
| 528 | ret = trace_test_buffer(tr, NULL); |
| 529 | if (ret) |
| 530 | goto out; |
| 531 | |
| 532 | ret = trace_test_buffer(&max_tr, &count); |
| 533 | |
| 534 | if (!ret && !count) { |
| 535 | printk(KERN_CONT ".. no entries found .."); |
| 536 | ret = -1; |
| 537 | goto out; |
| 538 | } |
| 539 | |
Frederic Weisbecker | ac1d52d | 2009-03-16 00:32:41 +0100 | [diff] [blame] | 540 | out: |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 541 | tracing_start(); |
Frederic Weisbecker | ac1d52d | 2009-03-16 00:32:41 +0100 | [diff] [blame] | 542 | out_no_start: |
| 543 | trace->reset(tr); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 544 | tracing_max_latency = save_max; |
| 545 | |
| 546 | return ret; |
| 547 | } |
| 548 | #endif /* CONFIG_IRQSOFF_TRACER && CONFIG_PREEMPT_TRACER */ |
| 549 | |
Steven Noonan | fb1b6d8 | 2008-09-19 03:06:43 -0700 | [diff] [blame] | 550 | #ifdef CONFIG_NOP_TRACER |
| 551 | int |
| 552 | trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr) |
| 553 | { |
| 554 | /* What could possibly go wrong? */ |
| 555 | return 0; |
| 556 | } |
| 557 | #endif |
| 558 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 559 | #ifdef CONFIG_SCHED_TRACER |
| 560 | static int trace_wakeup_test_thread(void *data) |
| 561 | { |
Steven Rostedt | 05bd68c | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 562 | /* Make this a RT thread, doesn't need to be too high */ |
| 563 | struct sched_param param = { .sched_priority = 5 }; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 564 | struct completion *x = data; |
| 565 | |
Steven Rostedt | 05bd68c | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 566 | sched_setscheduler(current, SCHED_FIFO, ¶m); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 567 | |
| 568 | /* Make it know we have a new prio */ |
| 569 | complete(x); |
| 570 | |
| 571 | /* now go to sleep and let the test wake us up */ |
| 572 | set_current_state(TASK_INTERRUPTIBLE); |
| 573 | schedule(); |
| 574 | |
| 575 | /* we are awake, now wait to disappear */ |
| 576 | while (!kthread_should_stop()) { |
| 577 | /* |
| 578 | * This is an RT task, do short sleeps to let |
| 579 | * others run. |
| 580 | */ |
| 581 | msleep(100); |
| 582 | } |
| 583 | |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | int |
| 588 | trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr) |
| 589 | { |
| 590 | unsigned long save_max = tracing_max_latency; |
| 591 | struct task_struct *p; |
| 592 | struct completion isrt; |
| 593 | unsigned long count; |
| 594 | int ret; |
| 595 | |
| 596 | init_completion(&isrt); |
| 597 | |
| 598 | /* create a high prio thread */ |
| 599 | p = kthread_run(trace_wakeup_test_thread, &isrt, "ftrace-test"); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 600 | if (IS_ERR(p)) { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 601 | printk(KERN_CONT "Failed to create ftrace wakeup test thread "); |
| 602 | return -1; |
| 603 | } |
| 604 | |
| 605 | /* make sure the thread is running at an RT prio */ |
| 606 | wait_for_completion(&isrt); |
| 607 | |
| 608 | /* start the tracing */ |
Arnaldo Carvalho de Melo | b6f11df | 2009-02-05 18:02:00 -0200 | [diff] [blame] | 609 | ret = tracer_init(trace, tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 610 | if (ret) { |
| 611 | warn_failed_init_tracer(trace, ret); |
| 612 | return ret; |
| 613 | } |
| 614 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 615 | /* reset the max latency */ |
| 616 | tracing_max_latency = 0; |
| 617 | |
| 618 | /* sleep to let the RT thread sleep too */ |
| 619 | msleep(100); |
| 620 | |
| 621 | /* |
| 622 | * Yes this is slightly racy. It is possible that for some |
| 623 | * strange reason that the RT thread we created, did not |
| 624 | * call schedule for 100ms after doing the completion, |
| 625 | * and we do a wakeup on a task that already is awake. |
| 626 | * But that is extremely unlikely, and the worst thing that |
| 627 | * happens in such a case, is that we disable tracing. |
| 628 | * Honestly, if this race does happen something is horrible |
| 629 | * wrong with the system. |
| 630 | */ |
| 631 | |
| 632 | wake_up_process(p); |
| 633 | |
Steven Rostedt | 5aa60c6 | 2008-09-29 23:02:37 -0400 | [diff] [blame] | 634 | /* give a little time to let the thread wake up */ |
| 635 | msleep(100); |
| 636 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 637 | /* stop the tracing. */ |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 638 | tracing_stop(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 639 | /* check both trace buffers */ |
| 640 | ret = trace_test_buffer(tr, NULL); |
| 641 | if (!ret) |
| 642 | ret = trace_test_buffer(&max_tr, &count); |
| 643 | |
| 644 | |
| 645 | trace->reset(tr); |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 646 | tracing_start(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 647 | |
| 648 | tracing_max_latency = save_max; |
| 649 | |
| 650 | /* kill the thread */ |
| 651 | kthread_stop(p); |
| 652 | |
| 653 | if (!ret && !count) { |
| 654 | printk(KERN_CONT ".. no entries found .."); |
| 655 | ret = -1; |
| 656 | } |
| 657 | |
| 658 | return ret; |
| 659 | } |
| 660 | #endif /* CONFIG_SCHED_TRACER */ |
| 661 | |
| 662 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER |
| 663 | int |
| 664 | trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr) |
| 665 | { |
| 666 | unsigned long count; |
| 667 | int ret; |
| 668 | |
| 669 | /* start the tracing */ |
Arnaldo Carvalho de Melo | b6f11df | 2009-02-05 18:02:00 -0200 | [diff] [blame] | 670 | ret = tracer_init(trace, tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 671 | if (ret) { |
| 672 | warn_failed_init_tracer(trace, ret); |
| 673 | return ret; |
| 674 | } |
| 675 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 676 | /* Sleep for a 1/10 of a second */ |
| 677 | msleep(100); |
| 678 | /* stop the tracing. */ |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 679 | tracing_stop(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 680 | /* check the trace buffer */ |
| 681 | ret = trace_test_buffer(tr, &count); |
| 682 | trace->reset(tr); |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 683 | tracing_start(); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 684 | |
| 685 | if (!ret && !count) { |
| 686 | printk(KERN_CONT ".. no entries found .."); |
| 687 | ret = -1; |
| 688 | } |
| 689 | |
| 690 | return ret; |
| 691 | } |
| 692 | #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ |
Ingo Molnar | a6dd24f | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 693 | |
| 694 | #ifdef CONFIG_SYSPROF_TRACER |
| 695 | int |
| 696 | trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr) |
| 697 | { |
| 698 | unsigned long count; |
| 699 | int ret; |
| 700 | |
| 701 | /* start the tracing */ |
Arnaldo Carvalho de Melo | b6f11df | 2009-02-05 18:02:00 -0200 | [diff] [blame] | 702 | ret = tracer_init(trace, tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 703 | if (ret) { |
| 704 | warn_failed_init_tracer(trace, ret); |
Wenji Huang | d2ef7c2 | 2009-02-17 01:09:47 -0500 | [diff] [blame] | 705 | return ret; |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 706 | } |
| 707 | |
Ingo Molnar | a6dd24f | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 708 | /* Sleep for a 1/10 of a second */ |
| 709 | msleep(100); |
| 710 | /* stop the tracing. */ |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 711 | tracing_stop(); |
Ingo Molnar | a6dd24f | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 712 | /* check the trace buffer */ |
| 713 | ret = trace_test_buffer(tr, &count); |
| 714 | trace->reset(tr); |
Steven Rostedt | bbf5b1a | 2008-11-07 22:36:02 -0500 | [diff] [blame] | 715 | tracing_start(); |
Ingo Molnar | a6dd24f | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 716 | |
Wenji Huang | d2ef7c2 | 2009-02-17 01:09:47 -0500 | [diff] [blame] | 717 | if (!ret && !count) { |
| 718 | printk(KERN_CONT ".. no entries found .."); |
| 719 | ret = -1; |
| 720 | } |
| 721 | |
Ingo Molnar | a6dd24f | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 722 | return ret; |
| 723 | } |
| 724 | #endif /* CONFIG_SYSPROF_TRACER */ |
Steven Rostedt | 80e5ea4 | 2008-11-12 15:24:24 -0500 | [diff] [blame] | 725 | |
| 726 | #ifdef CONFIG_BRANCH_TRACER |
| 727 | int |
| 728 | trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr) |
| 729 | { |
| 730 | unsigned long count; |
| 731 | int ret; |
| 732 | |
| 733 | /* start the tracing */ |
Arnaldo Carvalho de Melo | b6f11df | 2009-02-05 18:02:00 -0200 | [diff] [blame] | 734 | ret = tracer_init(trace, tr); |
Frederic Weisbecker | 1c80025 | 2008-11-16 05:57:26 +0100 | [diff] [blame] | 735 | if (ret) { |
| 736 | warn_failed_init_tracer(trace, ret); |
| 737 | return ret; |
| 738 | } |
| 739 | |
Steven Rostedt | 80e5ea4 | 2008-11-12 15:24:24 -0500 | [diff] [blame] | 740 | /* Sleep for a 1/10 of a second */ |
| 741 | msleep(100); |
| 742 | /* stop the tracing. */ |
| 743 | tracing_stop(); |
| 744 | /* check the trace buffer */ |
| 745 | ret = trace_test_buffer(tr, &count); |
| 746 | trace->reset(tr); |
| 747 | tracing_start(); |
| 748 | |
Wenji Huang | d2ef7c2 | 2009-02-17 01:09:47 -0500 | [diff] [blame] | 749 | if (!ret && !count) { |
| 750 | printk(KERN_CONT ".. no entries found .."); |
| 751 | ret = -1; |
| 752 | } |
| 753 | |
Steven Rostedt | 80e5ea4 | 2008-11-12 15:24:24 -0500 | [diff] [blame] | 754 | return ret; |
| 755 | } |
| 756 | #endif /* CONFIG_BRANCH_TRACER */ |
Markus Metzger | 321bb5e | 2009-03-13 10:50:27 +0100 | [diff] [blame] | 757 | |
K.Prasad | 0722db0 | 2009-06-01 23:46:40 +0530 | [diff] [blame] | 758 | #ifdef CONFIG_KSYM_TRACER |
| 759 | static int ksym_selftest_dummy; |
| 760 | |
| 761 | int |
| 762 | trace_selftest_startup_ksym(struct tracer *trace, struct trace_array *tr) |
| 763 | { |
| 764 | unsigned long count; |
| 765 | int ret; |
| 766 | |
| 767 | /* start the tracing */ |
| 768 | ret = tracer_init(trace, tr); |
| 769 | if (ret) { |
| 770 | warn_failed_init_tracer(trace, ret); |
| 771 | return ret; |
| 772 | } |
| 773 | |
| 774 | ksym_selftest_dummy = 0; |
| 775 | /* Register the read-write tracing request */ |
Li Zefan | 30ff21e3 | 2009-09-10 09:35:20 +0800 | [diff] [blame] | 776 | |
| 777 | ret = process_new_ksym_entry("ksym_selftest_dummy", |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 778 | HW_BREAKPOINT_R | HW_BREAKPOINT_W, |
K.Prasad | 0722db0 | 2009-06-01 23:46:40 +0530 | [diff] [blame] | 779 | (unsigned long)(&ksym_selftest_dummy)); |
| 780 | |
| 781 | if (ret < 0) { |
| 782 | printk(KERN_CONT "ksym_trace read-write startup test failed\n"); |
| 783 | goto ret_path; |
| 784 | } |
| 785 | /* Perform a read and a write operation over the dummy variable to |
| 786 | * trigger the tracer |
| 787 | */ |
| 788 | if (ksym_selftest_dummy == 0) |
| 789 | ksym_selftest_dummy++; |
| 790 | |
| 791 | /* stop the tracing. */ |
| 792 | tracing_stop(); |
| 793 | /* check the trace buffer */ |
| 794 | ret = trace_test_buffer(tr, &count); |
| 795 | trace->reset(tr); |
| 796 | tracing_start(); |
| 797 | |
| 798 | /* read & write operations - one each is performed on the dummy variable |
| 799 | * triggering two entries in the trace buffer |
| 800 | */ |
| 801 | if (!ret && count != 2) { |
| 802 | printk(KERN_CONT "Ksym tracer startup test failed"); |
| 803 | ret = -1; |
| 804 | } |
| 805 | |
| 806 | ret_path: |
| 807 | return ret; |
| 808 | } |
| 809 | #endif /* CONFIG_KSYM_TRACER */ |
| 810 | |