Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1 | /* |
| 2 | * event tracer |
| 3 | * |
| 4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> |
| 5 | * |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 6 | * - Added format output of fields of the trace point. |
| 7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. |
| 8 | * |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 9 | */ |
| 10 | |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 11 | #define pr_fmt(fmt) fmt |
| 12 | |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 13 | #include <linux/workqueue.h> |
| 14 | #include <linux/spinlock.h> |
| 15 | #include <linux/kthread.h> |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 16 | #include <linux/debugfs.h> |
| 17 | #include <linux/uaccess.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/ctype.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 21 | #include <linux/delay.h> |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 22 | |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 23 | #include <asm/setup.h> |
| 24 | |
Steven Rostedt | 91729ef9 | 2009-03-02 15:03:01 -0500 | [diff] [blame] | 25 | #include "trace_output.h" |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 26 | |
Steven Rostedt | 4e5292e | 2009-09-12 19:26:21 -0400 | [diff] [blame] | 27 | #undef TRACE_SYSTEM |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 28 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
| 29 | |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 30 | DEFINE_MUTEX(event_mutex); |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 31 | |
Steven Rostedt | a59fd60 | 2009-04-10 13:52:20 -0400 | [diff] [blame] | 32 | LIST_HEAD(ftrace_events); |
zhangwei(Jovi) | b3a8c6f | 2013-03-11 15:13:42 +0800 | [diff] [blame] | 33 | static LIST_HEAD(ftrace_common_fields); |
Steven Rostedt | a59fd60 | 2009-04-10 13:52:20 -0400 | [diff] [blame] | 34 | |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 35 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
| 36 | |
| 37 | static struct kmem_cache *field_cachep; |
| 38 | static struct kmem_cache *file_cachep; |
| 39 | |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 40 | #define SYSTEM_FL_FREE_NAME (1 << 31) |
| 41 | |
| 42 | static inline int system_refcount(struct event_subsystem *system) |
| 43 | { |
| 44 | return system->ref_count & ~SYSTEM_FL_FREE_NAME; |
| 45 | } |
| 46 | |
| 47 | static int system_refcount_inc(struct event_subsystem *system) |
| 48 | { |
| 49 | return (system->ref_count++) & ~SYSTEM_FL_FREE_NAME; |
| 50 | } |
| 51 | |
| 52 | static int system_refcount_dec(struct event_subsystem *system) |
| 53 | { |
| 54 | return (--system->ref_count) & ~SYSTEM_FL_FREE_NAME; |
| 55 | } |
| 56 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 57 | /* Double loops, do not use break, only goto's work */ |
| 58 | #define do_for_each_event_file(tr, file) \ |
| 59 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ |
| 60 | list_for_each_entry(file, &tr->events, list) |
| 61 | |
| 62 | #define do_for_each_event_file_safe(tr, file) \ |
| 63 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ |
| 64 | struct ftrace_event_file *___n; \ |
| 65 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
| 66 | |
| 67 | #define while_for_each_event_file() \ |
| 68 | } |
| 69 | |
zhangwei(Jovi) | b3a8c6f | 2013-03-11 15:13:42 +0800 | [diff] [blame] | 70 | static struct list_head * |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 71 | trace_get_fields(struct ftrace_event_call *event_call) |
| 72 | { |
| 73 | if (!event_call->class->get_fields) |
| 74 | return &event_call->class->fields; |
| 75 | return event_call->class->get_fields(event_call); |
| 76 | } |
| 77 | |
zhangwei(Jovi) | b3a8c6f | 2013-03-11 15:13:42 +0800 | [diff] [blame] | 78 | static struct ftrace_event_field * |
| 79 | __find_event_field(struct list_head *head, char *name) |
| 80 | { |
| 81 | struct ftrace_event_field *field; |
| 82 | |
| 83 | list_for_each_entry(field, head, link) { |
| 84 | if (!strcmp(field->name, name)) |
| 85 | return field; |
| 86 | } |
| 87 | |
| 88 | return NULL; |
| 89 | } |
| 90 | |
| 91 | struct ftrace_event_field * |
| 92 | trace_find_event_field(struct ftrace_event_call *call, char *name) |
| 93 | { |
| 94 | struct ftrace_event_field *field; |
| 95 | struct list_head *head; |
| 96 | |
| 97 | field = __find_event_field(&ftrace_common_fields, name); |
| 98 | if (field) |
| 99 | return field; |
| 100 | |
| 101 | head = trace_get_fields(call); |
| 102 | return __find_event_field(head, name); |
| 103 | } |
| 104 | |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 105 | static int __trace_define_field(struct list_head *head, const char *type, |
| 106 | const char *name, int offset, int size, |
| 107 | int is_signed, int filter_type) |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 108 | { |
| 109 | struct ftrace_event_field *field; |
| 110 | |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 111 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 112 | if (!field) |
Namhyung Kim | aaf6ac0 | 2013-06-07 15:07:48 +0900 | [diff] [blame] | 113 | return -ENOMEM; |
Ingo Molnar | fe9f57f | 2009-03-22 18:41:59 +0100 | [diff] [blame] | 114 | |
Steven Rostedt | 92edca0 | 2013-02-27 20:41:37 -0500 | [diff] [blame] | 115 | field->name = name; |
| 116 | field->type = type; |
Ingo Molnar | fe9f57f | 2009-03-22 18:41:59 +0100 | [diff] [blame] | 117 | |
Li Zefan | 43b51ea | 2009-08-07 10:33:22 +0800 | [diff] [blame] | 118 | if (filter_type == FILTER_OTHER) |
| 119 | field->filter_type = filter_assign_type(type); |
| 120 | else |
| 121 | field->filter_type = filter_type; |
| 122 | |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 123 | field->offset = offset; |
| 124 | field->size = size; |
Tom Zanussi | a118e4d | 2009-04-28 03:04:53 -0500 | [diff] [blame] | 125 | field->is_signed = is_signed; |
Li Zefan | aa38e9f | 2009-08-07 10:33:02 +0800 | [diff] [blame] | 126 | |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 127 | list_add(&field->link, head); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 128 | |
| 129 | return 0; |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 130 | } |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 131 | |
| 132 | int trace_define_field(struct ftrace_event_call *call, const char *type, |
| 133 | const char *name, int offset, int size, int is_signed, |
| 134 | int filter_type) |
| 135 | { |
| 136 | struct list_head *head; |
| 137 | |
| 138 | if (WARN_ON(!call->class)) |
| 139 | return 0; |
| 140 | |
| 141 | head = trace_get_fields(call); |
| 142 | return __trace_define_field(head, type, name, offset, size, |
| 143 | is_signed, filter_type); |
| 144 | } |
Steven Rostedt | 17c873e | 2009-04-10 18:12:50 -0400 | [diff] [blame] | 145 | EXPORT_SYMBOL_GPL(trace_define_field); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 146 | |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 147 | #define __common_field(type, item) \ |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 148 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
| 149 | "common_" #item, \ |
| 150 | offsetof(typeof(ent), item), \ |
| 151 | sizeof(ent.item), \ |
| 152 | is_signed_type(type), FILTER_OTHER); \ |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 153 | if (ret) \ |
| 154 | return ret; |
| 155 | |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 156 | static int trace_define_common_fields(void) |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 157 | { |
| 158 | int ret; |
| 159 | struct trace_entry ent; |
| 160 | |
| 161 | __common_field(unsigned short, type); |
| 162 | __common_field(unsigned char, flags); |
| 163 | __common_field(unsigned char, preempt_count); |
| 164 | __common_field(int, pid); |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 165 | |
| 166 | return ret; |
| 167 | } |
| 168 | |
zhangwei(Jovi) | ad7067c | 2013-03-11 15:13:46 +0800 | [diff] [blame] | 169 | static void trace_destroy_fields(struct ftrace_event_call *call) |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 170 | { |
| 171 | struct ftrace_event_field *field, *next; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 172 | struct list_head *head; |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 173 | |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 174 | head = trace_get_fields(call); |
| 175 | list_for_each_entry_safe(field, next, head, link) { |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 176 | list_del(&field->link); |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 177 | kmem_cache_free(field_cachep, field); |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 178 | } |
| 179 | } |
| 180 | |
Li Zefan | 87d9b4e | 2009-12-08 11:14:20 +0800 | [diff] [blame] | 181 | int trace_event_raw_init(struct ftrace_event_call *call) |
| 182 | { |
| 183 | int id; |
| 184 | |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 185 | id = register_ftrace_event(&call->event); |
Li Zefan | 87d9b4e | 2009-12-08 11:14:20 +0800 | [diff] [blame] | 186 | if (!id) |
| 187 | return -ENODEV; |
Li Zefan | 87d9b4e | 2009-12-08 11:14:20 +0800 | [diff] [blame] | 188 | |
| 189 | return 0; |
| 190 | } |
| 191 | EXPORT_SYMBOL_GPL(trace_event_raw_init); |
| 192 | |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 193 | void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer, |
| 194 | struct ftrace_event_file *ftrace_file, |
| 195 | unsigned long len) |
| 196 | { |
| 197 | struct ftrace_event_call *event_call = ftrace_file->event_call; |
| 198 | |
| 199 | local_save_flags(fbuffer->flags); |
| 200 | fbuffer->pc = preempt_count(); |
| 201 | fbuffer->ftrace_file = ftrace_file; |
| 202 | |
| 203 | fbuffer->event = |
| 204 | trace_event_buffer_lock_reserve(&fbuffer->buffer, ftrace_file, |
| 205 | event_call->event.type, len, |
| 206 | fbuffer->flags, fbuffer->pc); |
| 207 | if (!fbuffer->event) |
| 208 | return NULL; |
| 209 | |
| 210 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); |
| 211 | return fbuffer->entry; |
| 212 | } |
| 213 | EXPORT_SYMBOL_GPL(ftrace_event_buffer_reserve); |
| 214 | |
Steven Rostedt (Red Hat) | 0daa2302 | 2014-12-12 22:27:10 -0500 | [diff] [blame] | 215 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
| 216 | |
| 217 | static void output_printk(struct ftrace_event_buffer *fbuffer) |
| 218 | { |
| 219 | struct ftrace_event_call *event_call; |
| 220 | struct trace_event *event; |
| 221 | unsigned long flags; |
| 222 | struct trace_iterator *iter = tracepoint_print_iter; |
| 223 | |
| 224 | if (!iter) |
| 225 | return; |
| 226 | |
| 227 | event_call = fbuffer->ftrace_file->event_call; |
| 228 | if (!event_call || !event_call->event.funcs || |
| 229 | !event_call->event.funcs->trace) |
| 230 | return; |
| 231 | |
| 232 | event = &fbuffer->ftrace_file->event_call->event; |
| 233 | |
| 234 | spin_lock_irqsave(&tracepoint_iter_lock, flags); |
| 235 | trace_seq_init(&iter->seq); |
| 236 | iter->ent = fbuffer->entry; |
| 237 | event_call->event.funcs->trace(iter, 0, event); |
| 238 | trace_seq_putc(&iter->seq, 0); |
| 239 | printk("%s", iter->seq.buffer); |
| 240 | |
| 241 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); |
| 242 | } |
| 243 | |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 244 | void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer) |
| 245 | { |
Steven Rostedt (Red Hat) | 0daa2302 | 2014-12-12 22:27:10 -0500 | [diff] [blame] | 246 | if (tracepoint_printk) |
| 247 | output_printk(fbuffer); |
| 248 | |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 249 | event_trigger_unlock_commit(fbuffer->ftrace_file, fbuffer->buffer, |
| 250 | fbuffer->event, fbuffer->entry, |
| 251 | fbuffer->flags, fbuffer->pc); |
| 252 | } |
| 253 | EXPORT_SYMBOL_GPL(ftrace_event_buffer_commit); |
| 254 | |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 255 | int ftrace_event_reg(struct ftrace_event_call *call, |
| 256 | enum trace_reg type, void *data) |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 257 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 258 | struct ftrace_event_file *file = data; |
| 259 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 260 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 261 | switch (type) { |
| 262 | case TRACE_REG_REGISTER: |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 263 | return tracepoint_probe_register(call->tp, |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 264 | call->class->probe, |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 265 | file); |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 266 | case TRACE_REG_UNREGISTER: |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 267 | tracepoint_probe_unregister(call->tp, |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 268 | call->class->probe, |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 269 | file); |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 270 | return 0; |
| 271 | |
| 272 | #ifdef CONFIG_PERF_EVENTS |
| 273 | case TRACE_REG_PERF_REGISTER: |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 274 | return tracepoint_probe_register(call->tp, |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 275 | call->class->perf_probe, |
| 276 | call); |
| 277 | case TRACE_REG_PERF_UNREGISTER: |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 278 | tracepoint_probe_unregister(call->tp, |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 279 | call->class->perf_probe, |
| 280 | call); |
| 281 | return 0; |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 282 | case TRACE_REG_PERF_OPEN: |
| 283 | case TRACE_REG_PERF_CLOSE: |
Jiri Olsa | 489c75c | 2012-02-15 15:51:50 +0100 | [diff] [blame] | 284 | case TRACE_REG_PERF_ADD: |
| 285 | case TRACE_REG_PERF_DEL: |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 286 | return 0; |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 287 | #endif |
| 288 | } |
| 289 | return 0; |
| 290 | } |
| 291 | EXPORT_SYMBOL_GPL(ftrace_event_reg); |
| 292 | |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 293 | void trace_event_enable_cmd_record(bool enable) |
| 294 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 295 | struct ftrace_event_file *file; |
| 296 | struct trace_array *tr; |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 297 | |
| 298 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 299 | do_for_each_event_file(tr, file) { |
| 300 | |
| 301 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 302 | continue; |
| 303 | |
| 304 | if (enable) { |
| 305 | tracing_start_cmdline_record(); |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 306 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 307 | } else { |
| 308 | tracing_stop_cmdline_record(); |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 309 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 310 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 311 | } while_for_each_event_file(); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 312 | mutex_unlock(&event_mutex); |
| 313 | } |
| 314 | |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 315 | static int __ftrace_event_enable_disable(struct ftrace_event_file *file, |
| 316 | int enable, int soft_disable) |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 317 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 318 | struct ftrace_event_call *call = file->event_call; |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 319 | int ret = 0; |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 320 | int disable; |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 321 | |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 322 | switch (enable) { |
| 323 | case 0: |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 324 | /* |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 325 | * When soft_disable is set and enable is cleared, the sm_ref |
| 326 | * reference counter is decremented. If it reaches 0, we want |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 327 | * to clear the SOFT_DISABLED flag but leave the event in the |
| 328 | * state that it was. That is, if the event was enabled and |
| 329 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED |
| 330 | * is set we do not want the event to be enabled before we |
| 331 | * clear the bit. |
| 332 | * |
| 333 | * When soft_disable is not set but the SOFT_MODE flag is, |
| 334 | * we do nothing. Do not disable the tracepoint, otherwise |
| 335 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. |
| 336 | */ |
| 337 | if (soft_disable) { |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 338 | if (atomic_dec_return(&file->sm_ref) > 0) |
| 339 | break; |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 340 | disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED; |
| 341 | clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); |
| 342 | } else |
| 343 | disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE); |
| 344 | |
| 345 | if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) { |
| 346 | clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 347 | if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 348 | tracing_stop_cmdline_record(); |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 349 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 350 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 351 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 352 | } |
Tom Zanussi | 3baa5e4 | 2013-06-29 00:08:07 -0500 | [diff] [blame] | 353 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 354 | if (file->flags & FTRACE_EVENT_FL_SOFT_MODE) |
| 355 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); |
Tom Zanussi | 3baa5e4 | 2013-06-29 00:08:07 -0500 | [diff] [blame] | 356 | else |
| 357 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 358 | break; |
| 359 | case 1: |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 360 | /* |
| 361 | * When soft_disable is set and enable is set, we want to |
| 362 | * register the tracepoint for the event, but leave the event |
| 363 | * as is. That means, if the event was already enabled, we do |
| 364 | * nothing (but set SOFT_MODE). If the event is disabled, we |
| 365 | * set SOFT_DISABLED before enabling the event tracepoint, so |
| 366 | * it still seems to be disabled. |
| 367 | */ |
| 368 | if (!soft_disable) |
| 369 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 370 | else { |
| 371 | if (atomic_inc_return(&file->sm_ref) > 1) |
| 372 | break; |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 373 | set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 374 | } |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 375 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 376 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 377 | |
| 378 | /* Keep the event disabled, when going to SOFT_MODE. */ |
| 379 | if (soft_disable) |
| 380 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); |
| 381 | |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 382 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
| 383 | tracing_start_cmdline_record(); |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 384 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 385 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 386 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 387 | if (ret) { |
| 388 | tracing_stop_cmdline_record(); |
| 389 | pr_info("event trace: Could not enable event " |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 390 | "%s\n", ftrace_event_name(call)); |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 391 | break; |
| 392 | } |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 393 | set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 394 | |
| 395 | /* WAS_ENABLED gets set but never cleared. */ |
| 396 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 397 | } |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 398 | break; |
| 399 | } |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 400 | |
| 401 | return ret; |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 402 | } |
| 403 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 404 | int trace_event_enable_disable(struct ftrace_event_file *file, |
| 405 | int enable, int soft_disable) |
| 406 | { |
| 407 | return __ftrace_event_enable_disable(file, enable, soft_disable); |
| 408 | } |
| 409 | |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 410 | static int ftrace_event_enable_disable(struct ftrace_event_file *file, |
| 411 | int enable) |
| 412 | { |
| 413 | return __ftrace_event_enable_disable(file, enable, 0); |
| 414 | } |
| 415 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 416 | static void ftrace_clear_events(struct trace_array *tr) |
Zhaolei | 0e907c9 | 2009-05-25 18:13:59 +0800 | [diff] [blame] | 417 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 418 | struct ftrace_event_file *file; |
Zhaolei | 0e907c9 | 2009-05-25 18:13:59 +0800 | [diff] [blame] | 419 | |
| 420 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 421 | list_for_each_entry(file, &tr->events, list) { |
| 422 | ftrace_event_enable_disable(file, 0); |
Zhaolei | 0e907c9 | 2009-05-25 18:13:59 +0800 | [diff] [blame] | 423 | } |
| 424 | mutex_unlock(&event_mutex); |
| 425 | } |
| 426 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 427 | static void __put_system(struct event_subsystem *system) |
| 428 | { |
| 429 | struct event_filter *filter = system->filter; |
| 430 | |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 431 | WARN_ON_ONCE(system_refcount(system) == 0); |
| 432 | if (system_refcount_dec(system)) |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 433 | return; |
| 434 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 435 | list_del(&system->list); |
| 436 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 437 | if (filter) { |
| 438 | kfree(filter->filter_string); |
| 439 | kfree(filter); |
| 440 | } |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 441 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
| 442 | kfree(system->name); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 443 | kfree(system); |
| 444 | } |
| 445 | |
| 446 | static void __get_system(struct event_subsystem *system) |
| 447 | { |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 448 | WARN_ON_ONCE(system_refcount(system) == 0); |
| 449 | system_refcount_inc(system); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 450 | } |
| 451 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 452 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
| 453 | { |
| 454 | WARN_ON_ONCE(dir->ref_count == 0); |
| 455 | dir->ref_count++; |
| 456 | __get_system(dir->subsystem); |
| 457 | } |
| 458 | |
| 459 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) |
| 460 | { |
| 461 | WARN_ON_ONCE(dir->ref_count == 0); |
| 462 | /* If the subsystem is about to be freed, the dir must be too */ |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 463 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 464 | |
| 465 | __put_system(dir->subsystem); |
| 466 | if (!--dir->ref_count) |
| 467 | kfree(dir); |
| 468 | } |
| 469 | |
| 470 | static void put_system(struct ftrace_subsystem_dir *dir) |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 471 | { |
| 472 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 473 | __put_system_dir(dir); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 474 | mutex_unlock(&event_mutex); |
| 475 | } |
| 476 | |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 477 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
| 478 | { |
| 479 | if (!dir) |
| 480 | return; |
| 481 | |
| 482 | if (!--dir->nr_events) { |
| 483 | debugfs_remove_recursive(dir->entry); |
| 484 | list_del(&dir->list); |
| 485 | __put_system_dir(dir); |
| 486 | } |
| 487 | } |
| 488 | |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 489 | static void remove_event_file_dir(struct ftrace_event_file *file) |
| 490 | { |
Oleg Nesterov | bf682c3 | 2013-07-28 20:35:27 +0200 | [diff] [blame] | 491 | struct dentry *dir = file->dir; |
| 492 | struct dentry *child; |
| 493 | |
| 494 | if (dir) { |
| 495 | spin_lock(&dir->d_lock); /* probably unneeded */ |
Al Viro | 946e51f | 2014-10-26 19:19:16 -0400 | [diff] [blame] | 496 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
Oleg Nesterov | bf682c3 | 2013-07-28 20:35:27 +0200 | [diff] [blame] | 497 | if (child->d_inode) /* probably unneeded */ |
| 498 | child->d_inode->i_private = NULL; |
| 499 | } |
| 500 | spin_unlock(&dir->d_lock); |
| 501 | |
| 502 | debugfs_remove_recursive(dir); |
| 503 | } |
| 504 | |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 505 | list_del(&file->list); |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 506 | remove_subsystem(file->system); |
Oleg Nesterov | 2448e34 | 2014-07-11 21:06:38 +0200 | [diff] [blame] | 507 | free_event_filter(file->filter); |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 508 | kmem_cache_free(file_cachep, file); |
| 509 | } |
| 510 | |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 511 | /* |
| 512 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. |
| 513 | */ |
Steven Rostedt (Red Hat) | 2a6c24a | 2013-07-02 14:48:23 -0400 | [diff] [blame] | 514 | static int |
| 515 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, |
| 516 | const char *sub, const char *event, int set) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 517 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 518 | struct ftrace_event_file *file; |
Steven Rostedt | a59fd60 | 2009-04-10 13:52:20 -0400 | [diff] [blame] | 519 | struct ftrace_event_call *call; |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 520 | const char *name; |
Steven Rostedt | 29f9394 | 2009-05-08 16:06:47 -0400 | [diff] [blame] | 521 | int ret = -EINVAL; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 522 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 523 | list_for_each_entry(file, &tr->events, list) { |
| 524 | |
| 525 | call = file->event_call; |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 526 | name = ftrace_event_name(call); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 527 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 528 | if (!name || !call->class || !call->class->reg) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 529 | continue; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 530 | |
Steven Rostedt | 9b63776 | 2012-05-10 15:55:43 -0400 | [diff] [blame] | 531 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
| 532 | continue; |
| 533 | |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 534 | if (match && |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 535 | strcmp(match, name) != 0 && |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 536 | strcmp(match, call->class->system) != 0) |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 537 | continue; |
| 538 | |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 539 | if (sub && strcmp(sub, call->class->system) != 0) |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 540 | continue; |
| 541 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 542 | if (event && strcmp(event, name) != 0) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 543 | continue; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 544 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 545 | ftrace_event_enable_disable(file, set); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 546 | |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 547 | ret = 0; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 548 | } |
Steven Rostedt (Red Hat) | 2a6c24a | 2013-07-02 14:48:23 -0400 | [diff] [blame] | 549 | |
| 550 | return ret; |
| 551 | } |
| 552 | |
| 553 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, |
| 554 | const char *sub, const char *event, int set) |
| 555 | { |
| 556 | int ret; |
| 557 | |
| 558 | mutex_lock(&event_mutex); |
| 559 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 560 | mutex_unlock(&event_mutex); |
| 561 | |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 562 | return ret; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 563 | } |
| 564 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 565 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 566 | { |
| 567 | char *event = NULL, *sub = NULL, *match; |
| 568 | |
| 569 | /* |
| 570 | * The buf format can be <subsystem>:<event-name> |
| 571 | * *:<event-name> means any event by that name. |
| 572 | * :<event-name> is the same. |
| 573 | * |
| 574 | * <subsystem>:* means all events in that subsystem |
| 575 | * <subsystem>: means the same. |
| 576 | * |
| 577 | * <name> (no ':') means all events in a subsystem with |
| 578 | * the name <name> or any event that matches <name> |
| 579 | */ |
| 580 | |
| 581 | match = strsep(&buf, ":"); |
| 582 | if (buf) { |
| 583 | sub = match; |
| 584 | event = buf; |
| 585 | match = NULL; |
| 586 | |
| 587 | if (!strlen(sub) || strcmp(sub, "*") == 0) |
| 588 | sub = NULL; |
| 589 | if (!strlen(event) || strcmp(event, "*") == 0) |
| 590 | event = NULL; |
| 591 | } |
| 592 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 593 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 594 | } |
| 595 | |
Steven Rostedt | 4671c79 | 2009-05-08 16:27:41 -0400 | [diff] [blame] | 596 | /** |
| 597 | * trace_set_clr_event - enable or disable an event |
| 598 | * @system: system name to match (NULL for any system) |
| 599 | * @event: event name to match (NULL for all events, within system) |
| 600 | * @set: 1 to enable, 0 to disable |
| 601 | * |
| 602 | * This is a way for other parts of the kernel to enable or disable |
| 603 | * event recording. |
| 604 | * |
| 605 | * Returns 0 on success, -EINVAL if the parameters do not match any |
| 606 | * registered events. |
| 607 | */ |
| 608 | int trace_set_clr_event(const char *system, const char *event, int set) |
| 609 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 610 | struct trace_array *tr = top_trace_array(); |
| 611 | |
Yoshihiro YUNOMAE | dc81e5e | 2014-06-06 07:35:17 +0900 | [diff] [blame] | 612 | if (!tr) |
| 613 | return -ENODEV; |
| 614 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 615 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
Steven Rostedt | 4671c79 | 2009-05-08 16:27:41 -0400 | [diff] [blame] | 616 | } |
Yuanhan Liu | 56355b8 | 2010-11-08 14:05:12 +0800 | [diff] [blame] | 617 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
Steven Rostedt | 4671c79 | 2009-05-08 16:27:41 -0400 | [diff] [blame] | 618 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 619 | /* 128 should be much more than enough */ |
| 620 | #define EVENT_BUF_SIZE 127 |
| 621 | |
| 622 | static ssize_t |
| 623 | ftrace_event_write(struct file *file, const char __user *ubuf, |
| 624 | size_t cnt, loff_t *ppos) |
| 625 | { |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 626 | struct trace_parser parser; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 627 | struct seq_file *m = file->private_data; |
| 628 | struct trace_array *tr = m->private; |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 629 | ssize_t read, ret; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 630 | |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 631 | if (!cnt) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 632 | return 0; |
| 633 | |
Steven Rostedt | 1852fcc | 2009-03-11 14:33:00 -0400 | [diff] [blame] | 634 | ret = tracing_update_buffers(); |
| 635 | if (ret < 0) |
| 636 | return ret; |
| 637 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 638 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 639 | return -ENOMEM; |
| 640 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 641 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 642 | |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 643 | if (read >= 0 && trace_parser_loaded((&parser))) { |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 644 | int set = 1; |
| 645 | |
| 646 | if (*parser.buffer == '!') |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 647 | set = 0; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 648 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 649 | parser.buffer[parser.idx] = 0; |
| 650 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 651 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 652 | if (ret) |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 653 | goto out_put; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 654 | } |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 655 | |
| 656 | ret = read; |
| 657 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 658 | out_put: |
| 659 | trace_parser_put(&parser); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 660 | |
| 661 | return ret; |
| 662 | } |
| 663 | |
| 664 | static void * |
| 665 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 666 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 667 | struct ftrace_event_file *file = v; |
| 668 | struct ftrace_event_call *call; |
| 669 | struct trace_array *tr = m->private; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 670 | |
| 671 | (*pos)++; |
| 672 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 673 | list_for_each_entry_continue(file, &tr->events, list) { |
| 674 | call = file->event_call; |
Steven Rostedt | 40e2681 | 2009-03-10 11:32:40 -0400 | [diff] [blame] | 675 | /* |
| 676 | * The ftrace subsystem is for showing formats only. |
| 677 | * They can not be enabled or disabled via the event files. |
| 678 | */ |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 679 | if (call->class && call->class->reg) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 680 | return file; |
Steven Rostedt | 40e2681 | 2009-03-10 11:32:40 -0400 | [diff] [blame] | 681 | } |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 682 | |
Li Zefan | 30bd39c | 2009-09-18 14:07:05 +0800 | [diff] [blame] | 683 | return NULL; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 684 | } |
| 685 | |
| 686 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 687 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 688 | struct ftrace_event_file *file; |
| 689 | struct trace_array *tr = m->private; |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 690 | loff_t l; |
| 691 | |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 692 | mutex_lock(&event_mutex); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 693 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 694 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 695 | for (l = 0; l <= *pos; ) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 696 | file = t_next(m, file, &l); |
| 697 | if (!file) |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 698 | break; |
| 699 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 700 | return file; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | static void * |
| 704 | s_next(struct seq_file *m, void *v, loff_t *pos) |
| 705 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 706 | struct ftrace_event_file *file = v; |
| 707 | struct trace_array *tr = m->private; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 708 | |
| 709 | (*pos)++; |
| 710 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 711 | list_for_each_entry_continue(file, &tr->events, list) { |
| 712 | if (file->flags & FTRACE_EVENT_FL_ENABLED) |
| 713 | return file; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 714 | } |
| 715 | |
Li Zefan | 30bd39c | 2009-09-18 14:07:05 +0800 | [diff] [blame] | 716 | return NULL; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 717 | } |
| 718 | |
| 719 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 720 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 721 | struct ftrace_event_file *file; |
| 722 | struct trace_array *tr = m->private; |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 723 | loff_t l; |
| 724 | |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 725 | mutex_lock(&event_mutex); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 726 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 727 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 728 | for (l = 0; l <= *pos; ) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 729 | file = s_next(m, file, &l); |
| 730 | if (!file) |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 731 | break; |
| 732 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 733 | return file; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 734 | } |
| 735 | |
| 736 | static int t_show(struct seq_file *m, void *v) |
| 737 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 738 | struct ftrace_event_file *file = v; |
| 739 | struct ftrace_event_call *call = file->event_call; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 740 | |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 741 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
| 742 | seq_printf(m, "%s:", call->class->system); |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 743 | seq_printf(m, "%s\n", ftrace_event_name(call)); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 744 | |
| 745 | return 0; |
| 746 | } |
| 747 | |
| 748 | static void t_stop(struct seq_file *m, void *p) |
| 749 | { |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 750 | mutex_unlock(&event_mutex); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 751 | } |
| 752 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 753 | static ssize_t |
| 754 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 755 | loff_t *ppos) |
| 756 | { |
Oleg Nesterov | bc6f6b0 | 2013-07-26 19:25:36 +0200 | [diff] [blame] | 757 | struct ftrace_event_file *file; |
| 758 | unsigned long flags; |
Tom Zanussi | a439059 | 2013-06-29 00:08:04 -0500 | [diff] [blame] | 759 | char buf[4] = "0"; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 760 | |
Oleg Nesterov | bc6f6b0 | 2013-07-26 19:25:36 +0200 | [diff] [blame] | 761 | mutex_lock(&event_mutex); |
| 762 | file = event_file_data(filp); |
| 763 | if (likely(file)) |
| 764 | flags = file->flags; |
| 765 | mutex_unlock(&event_mutex); |
| 766 | |
| 767 | if (!file) |
| 768 | return -ENODEV; |
| 769 | |
| 770 | if (flags & FTRACE_EVENT_FL_ENABLED && |
| 771 | !(flags & FTRACE_EVENT_FL_SOFT_DISABLED)) |
Tom Zanussi | a439059 | 2013-06-29 00:08:04 -0500 | [diff] [blame] | 772 | strcpy(buf, "1"); |
| 773 | |
Oleg Nesterov | bc6f6b0 | 2013-07-26 19:25:36 +0200 | [diff] [blame] | 774 | if (flags & FTRACE_EVENT_FL_SOFT_DISABLED || |
| 775 | flags & FTRACE_EVENT_FL_SOFT_MODE) |
Tom Zanussi | a439059 | 2013-06-29 00:08:04 -0500 | [diff] [blame] | 776 | strcat(buf, "*"); |
| 777 | |
| 778 | strcat(buf, "\n"); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 779 | |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 780 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 781 | } |
| 782 | |
| 783 | static ssize_t |
| 784 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 785 | loff_t *ppos) |
| 786 | { |
Oleg Nesterov | bc6f6b0 | 2013-07-26 19:25:36 +0200 | [diff] [blame] | 787 | struct ftrace_event_file *file; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 788 | unsigned long val; |
| 789 | int ret; |
| 790 | |
Peter Huewe | 22fe9b5 | 2011-06-07 21:58:27 +0200 | [diff] [blame] | 791 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
| 792 | if (ret) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 793 | return ret; |
| 794 | |
Steven Rostedt | 1852fcc | 2009-03-11 14:33:00 -0400 | [diff] [blame] | 795 | ret = tracing_update_buffers(); |
| 796 | if (ret < 0) |
| 797 | return ret; |
| 798 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 799 | switch (val) { |
| 800 | case 0: |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 801 | case 1: |
Oleg Nesterov | bc6f6b0 | 2013-07-26 19:25:36 +0200 | [diff] [blame] | 802 | ret = -ENODEV; |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 803 | mutex_lock(&event_mutex); |
Oleg Nesterov | bc6f6b0 | 2013-07-26 19:25:36 +0200 | [diff] [blame] | 804 | file = event_file_data(filp); |
| 805 | if (likely(file)) |
| 806 | ret = ftrace_event_enable_disable(file, val); |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 807 | mutex_unlock(&event_mutex); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 808 | break; |
| 809 | |
| 810 | default: |
| 811 | return -EINVAL; |
| 812 | } |
| 813 | |
| 814 | *ppos += cnt; |
| 815 | |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 816 | return ret ? ret : cnt; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 817 | } |
| 818 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 819 | static ssize_t |
| 820 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 821 | loff_t *ppos) |
| 822 | { |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 823 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 824 | struct ftrace_subsystem_dir *dir = filp->private_data; |
| 825 | struct event_subsystem *system = dir->subsystem; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 826 | struct ftrace_event_call *call; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 827 | struct ftrace_event_file *file; |
| 828 | struct trace_array *tr = dir->tr; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 829 | char buf[2]; |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 830 | int set = 0; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 831 | int ret; |
| 832 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 833 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 834 | list_for_each_entry(file, &tr->events, list) { |
| 835 | call = file->event_call; |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 836 | if (!ftrace_event_name(call) || !call->class || !call->class->reg) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 837 | continue; |
| 838 | |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 839 | if (system && strcmp(call->class->system, system->name) != 0) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 840 | continue; |
| 841 | |
| 842 | /* |
| 843 | * We need to find out if all the events are set |
| 844 | * or if all events or cleared, or if we have |
| 845 | * a mixture. |
| 846 | */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 847 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 848 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 849 | /* |
| 850 | * If we have a mixture, no need to look further. |
| 851 | */ |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 852 | if (set == 3) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 853 | break; |
| 854 | } |
| 855 | mutex_unlock(&event_mutex); |
| 856 | |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 857 | buf[0] = set_to_char[set]; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 858 | buf[1] = '\n'; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 859 | |
| 860 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); |
| 861 | |
| 862 | return ret; |
| 863 | } |
| 864 | |
| 865 | static ssize_t |
| 866 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 867 | loff_t *ppos) |
| 868 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 869 | struct ftrace_subsystem_dir *dir = filp->private_data; |
| 870 | struct event_subsystem *system = dir->subsystem; |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 871 | const char *name = NULL; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 872 | unsigned long val; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 873 | ssize_t ret; |
| 874 | |
Peter Huewe | 22fe9b5 | 2011-06-07 21:58:27 +0200 | [diff] [blame] | 875 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
| 876 | if (ret) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 877 | return ret; |
| 878 | |
| 879 | ret = tracing_update_buffers(); |
| 880 | if (ret < 0) |
| 881 | return ret; |
| 882 | |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 883 | if (val != 0 && val != 1) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 884 | return -EINVAL; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 885 | |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 886 | /* |
| 887 | * Opening of "enable" adds a ref count to system, |
| 888 | * so the name is safe to use. |
| 889 | */ |
| 890 | if (system) |
| 891 | name = system->name; |
| 892 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 893 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 894 | if (ret) |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 895 | goto out; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 896 | |
| 897 | ret = cnt; |
| 898 | |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 899 | out: |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 900 | *ppos += cnt; |
| 901 | |
| 902 | return ret; |
| 903 | } |
| 904 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 905 | enum { |
| 906 | FORMAT_HEADER = 1, |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 907 | FORMAT_FIELD_SEPERATOR = 2, |
| 908 | FORMAT_PRINTFMT = 3, |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 909 | }; |
| 910 | |
| 911 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 912 | { |
Oleg Nesterov | c5a44a1 | 2013-07-26 19:25:43 +0200 | [diff] [blame] | 913 | struct ftrace_event_call *call = event_file_data(m->private); |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 914 | struct list_head *common_head = &ftrace_common_fields; |
| 915 | struct list_head *head = trace_get_fields(call); |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 916 | struct list_head *node = v; |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 917 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 918 | (*pos)++; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 919 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 920 | switch ((unsigned long)v) { |
| 921 | case FORMAT_HEADER: |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 922 | node = common_head; |
| 923 | break; |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 924 | |
| 925 | case FORMAT_FIELD_SEPERATOR: |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 926 | node = head; |
| 927 | break; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 928 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 929 | case FORMAT_PRINTFMT: |
| 930 | /* all done */ |
| 931 | return NULL; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 932 | } |
| 933 | |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 934 | node = node->prev; |
| 935 | if (node == common_head) |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 936 | return (void *)FORMAT_FIELD_SEPERATOR; |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 937 | else if (node == head) |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 938 | return (void *)FORMAT_PRINTFMT; |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 939 | else |
| 940 | return node; |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 941 | } |
| 942 | |
| 943 | static int f_show(struct seq_file *m, void *v) |
| 944 | { |
Oleg Nesterov | c5a44a1 | 2013-07-26 19:25:43 +0200 | [diff] [blame] | 945 | struct ftrace_event_call *call = event_file_data(m->private); |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 946 | struct ftrace_event_field *field; |
| 947 | const char *array_descriptor; |
| 948 | |
| 949 | switch ((unsigned long)v) { |
| 950 | case FORMAT_HEADER: |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 951 | seq_printf(m, "name: %s\n", ftrace_event_name(call)); |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 952 | seq_printf(m, "ID: %d\n", call->event.type); |
Rasmus Villemoes | fa6f0cc | 2014-11-08 21:42:10 +0100 | [diff] [blame] | 953 | seq_puts(m, "format:\n"); |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 954 | return 0; |
| 955 | |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 956 | case FORMAT_FIELD_SEPERATOR: |
| 957 | seq_putc(m, '\n'); |
| 958 | return 0; |
| 959 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 960 | case FORMAT_PRINTFMT: |
| 961 | seq_printf(m, "\nprint fmt: %s\n", |
| 962 | call->print_fmt); |
| 963 | return 0; |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 964 | } |
| 965 | |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 966 | field = list_entry(v, struct ftrace_event_field, link); |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 967 | /* |
| 968 | * Smartly shows the array type(except dynamic array). |
| 969 | * Normal: |
| 970 | * field:TYPE VAR |
| 971 | * If TYPE := TYPE[LEN], it is shown: |
| 972 | * field:TYPE VAR[LEN] |
| 973 | */ |
| 974 | array_descriptor = strchr(field->type, '['); |
| 975 | |
| 976 | if (!strncmp(field->type, "__data_loc", 10)) |
| 977 | array_descriptor = NULL; |
| 978 | |
| 979 | if (!array_descriptor) |
| 980 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", |
| 981 | field->type, field->name, field->offset, |
| 982 | field->size, !!field->is_signed); |
| 983 | else |
| 984 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", |
| 985 | (int)(array_descriptor - field->type), |
| 986 | field->type, field->name, |
| 987 | array_descriptor, field->offset, |
| 988 | field->size, !!field->is_signed); |
| 989 | |
| 990 | return 0; |
| 991 | } |
| 992 | |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 993 | static void *f_start(struct seq_file *m, loff_t *pos) |
| 994 | { |
| 995 | void *p = (void *)FORMAT_HEADER; |
| 996 | loff_t l = 0; |
| 997 | |
Oleg Nesterov | c5a44a1 | 2013-07-26 19:25:43 +0200 | [diff] [blame] | 998 | /* ->stop() is called even if ->start() fails */ |
| 999 | mutex_lock(&event_mutex); |
| 1000 | if (!event_file_data(m->private)) |
| 1001 | return ERR_PTR(-ENODEV); |
| 1002 | |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 1003 | while (l < *pos && p) |
| 1004 | p = f_next(m, p, &l); |
| 1005 | |
| 1006 | return p; |
| 1007 | } |
| 1008 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1009 | static void f_stop(struct seq_file *m, void *p) |
| 1010 | { |
Oleg Nesterov | c5a44a1 | 2013-07-26 19:25:43 +0200 | [diff] [blame] | 1011 | mutex_unlock(&event_mutex); |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1012 | } |
| 1013 | |
| 1014 | static const struct seq_operations trace_format_seq_ops = { |
| 1015 | .start = f_start, |
| 1016 | .next = f_next, |
| 1017 | .stop = f_stop, |
| 1018 | .show = f_show, |
| 1019 | }; |
| 1020 | |
| 1021 | static int trace_format_open(struct inode *inode, struct file *file) |
| 1022 | { |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1023 | struct seq_file *m; |
| 1024 | int ret; |
| 1025 | |
| 1026 | ret = seq_open(file, &trace_format_seq_ops); |
| 1027 | if (ret < 0) |
| 1028 | return ret; |
| 1029 | |
| 1030 | m = file->private_data; |
Oleg Nesterov | c5a44a1 | 2013-07-26 19:25:43 +0200 | [diff] [blame] | 1031 | m->private = file; |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1032 | |
| 1033 | return 0; |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 1034 | } |
| 1035 | |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1036 | static ssize_t |
| 1037 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) |
| 1038 | { |
Oleg Nesterov | 1a11126 | 2013-07-26 19:25:32 +0200 | [diff] [blame] | 1039 | int id = (long)event_file_data(filp); |
Oleg Nesterov | cd458ba | 2013-07-18 20:47:12 +0200 | [diff] [blame] | 1040 | char buf[32]; |
| 1041 | int len; |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1042 | |
| 1043 | if (*ppos) |
| 1044 | return 0; |
| 1045 | |
Oleg Nesterov | 1a11126 | 2013-07-26 19:25:32 +0200 | [diff] [blame] | 1046 | if (unlikely(!id)) |
| 1047 | return -ENODEV; |
| 1048 | |
| 1049 | len = sprintf(buf, "%d\n", id); |
| 1050 | |
Oleg Nesterov | cd458ba | 2013-07-18 20:47:12 +0200 | [diff] [blame] | 1051 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1052 | } |
| 1053 | |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1054 | static ssize_t |
| 1055 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 1056 | loff_t *ppos) |
| 1057 | { |
Tom Zanussi | f306cc8 | 2013-10-24 08:34:17 -0500 | [diff] [blame] | 1058 | struct ftrace_event_file *file; |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1059 | struct trace_seq *s; |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1060 | int r = -ENODEV; |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1061 | |
| 1062 | if (*ppos) |
| 1063 | return 0; |
| 1064 | |
| 1065 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1066 | |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1067 | if (!s) |
| 1068 | return -ENOMEM; |
| 1069 | |
| 1070 | trace_seq_init(s); |
| 1071 | |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1072 | mutex_lock(&event_mutex); |
Tom Zanussi | f306cc8 | 2013-10-24 08:34:17 -0500 | [diff] [blame] | 1073 | file = event_file_data(filp); |
| 1074 | if (file) |
| 1075 | print_event_filter(file, s); |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1076 | mutex_unlock(&event_mutex); |
| 1077 | |
Tom Zanussi | f306cc8 | 2013-10-24 08:34:17 -0500 | [diff] [blame] | 1078 | if (file) |
Steven Rostedt (Red Hat) | 5ac48378 | 2014-11-14 15:49:41 -0500 | [diff] [blame] | 1079 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
| 1080 | s->buffer, trace_seq_used(s)); |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1081 | |
| 1082 | kfree(s); |
| 1083 | |
| 1084 | return r; |
| 1085 | } |
| 1086 | |
| 1087 | static ssize_t |
| 1088 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 1089 | loff_t *ppos) |
| 1090 | { |
Tom Zanussi | f306cc8 | 2013-10-24 08:34:17 -0500 | [diff] [blame] | 1091 | struct ftrace_event_file *file; |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1092 | char *buf; |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1093 | int err = -ENODEV; |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1094 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1095 | if (cnt >= PAGE_SIZE) |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1096 | return -EINVAL; |
| 1097 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1098 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
| 1099 | if (!buf) |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1100 | return -ENOMEM; |
| 1101 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1102 | if (copy_from_user(buf, ubuf, cnt)) { |
| 1103 | free_page((unsigned long) buf); |
| 1104 | return -EFAULT; |
| 1105 | } |
| 1106 | buf[cnt] = '\0'; |
| 1107 | |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1108 | mutex_lock(&event_mutex); |
Tom Zanussi | f306cc8 | 2013-10-24 08:34:17 -0500 | [diff] [blame] | 1109 | file = event_file_data(filp); |
| 1110 | if (file) |
| 1111 | err = apply_event_filter(file, buf); |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1112 | mutex_unlock(&event_mutex); |
| 1113 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1114 | free_page((unsigned long) buf); |
| 1115 | if (err < 0) |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1116 | return err; |
Tom Zanussi | 0a19e53 | 2009-04-13 03:17:50 -0500 | [diff] [blame] | 1117 | |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1118 | *ppos += cnt; |
| 1119 | |
| 1120 | return cnt; |
| 1121 | } |
| 1122 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1123 | static LIST_HEAD(event_subsystems); |
| 1124 | |
| 1125 | static int subsystem_open(struct inode *inode, struct file *filp) |
| 1126 | { |
| 1127 | struct event_subsystem *system = NULL; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1128 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
| 1129 | struct trace_array *tr; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1130 | int ret; |
| 1131 | |
Geyslan G. Bem | d6d3523 | 2013-11-06 16:02:51 -0300 | [diff] [blame] | 1132 | if (tracing_is_disabled()) |
| 1133 | return -ENODEV; |
| 1134 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1135 | /* Make sure the system still exists */ |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 1136 | mutex_lock(&trace_types_lock); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1137 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1138 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
| 1139 | list_for_each_entry(dir, &tr->systems, list) { |
| 1140 | if (dir == inode->i_private) { |
| 1141 | /* Don't open systems with no events */ |
| 1142 | if (dir->nr_events) { |
| 1143 | __get_system_dir(dir); |
| 1144 | system = dir->subsystem; |
| 1145 | } |
| 1146 | goto exit_loop; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1147 | } |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1148 | } |
| 1149 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1150 | exit_loop: |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1151 | mutex_unlock(&event_mutex); |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 1152 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1153 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1154 | if (!system) |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1155 | return -ENODEV; |
| 1156 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1157 | /* Some versions of gcc think dir can be uninitialized here */ |
| 1158 | WARN_ON(!dir); |
| 1159 | |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1160 | /* Still need to increment the ref count of the system */ |
| 1161 | if (trace_array_get(tr) < 0) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1162 | put_system(dir); |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1163 | return -ENODEV; |
| 1164 | } |
| 1165 | |
| 1166 | ret = tracing_open_generic(inode, filp); |
| 1167 | if (ret < 0) { |
| 1168 | trace_array_put(tr); |
| 1169 | put_system(dir); |
| 1170 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1171 | |
| 1172 | return ret; |
| 1173 | } |
| 1174 | |
| 1175 | static int system_tr_open(struct inode *inode, struct file *filp) |
| 1176 | { |
| 1177 | struct ftrace_subsystem_dir *dir; |
| 1178 | struct trace_array *tr = inode->i_private; |
| 1179 | int ret; |
| 1180 | |
Geyslan G. Bem | d6d3523 | 2013-11-06 16:02:51 -0300 | [diff] [blame] | 1181 | if (tracing_is_disabled()) |
| 1182 | return -ENODEV; |
| 1183 | |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1184 | if (trace_array_get(tr) < 0) |
| 1185 | return -ENODEV; |
| 1186 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1187 | /* Make a temporary dir that has no system but points to tr */ |
| 1188 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1189 | if (!dir) { |
| 1190 | trace_array_put(tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1191 | return -ENOMEM; |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1192 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1193 | |
| 1194 | dir->tr = tr; |
| 1195 | |
| 1196 | ret = tracing_open_generic(inode, filp); |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1197 | if (ret < 0) { |
| 1198 | trace_array_put(tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1199 | kfree(dir); |
Geyslan G. Bem | d6d3523 | 2013-11-06 16:02:51 -0300 | [diff] [blame] | 1200 | return ret; |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1201 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1202 | |
| 1203 | filp->private_data = dir; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1204 | |
Geyslan G. Bem | d6d3523 | 2013-11-06 16:02:51 -0300 | [diff] [blame] | 1205 | return 0; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1206 | } |
| 1207 | |
| 1208 | static int subsystem_release(struct inode *inode, struct file *file) |
| 1209 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1210 | struct ftrace_subsystem_dir *dir = file->private_data; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1211 | |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1212 | trace_array_put(dir->tr); |
| 1213 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1214 | /* |
| 1215 | * If dir->subsystem is NULL, then this is a temporary |
| 1216 | * descriptor that was made for a trace_array to enable |
| 1217 | * all subsystems. |
| 1218 | */ |
| 1219 | if (dir->subsystem) |
| 1220 | put_system(dir); |
| 1221 | else |
| 1222 | kfree(dir); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1223 | |
| 1224 | return 0; |
| 1225 | } |
| 1226 | |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1227 | static ssize_t |
| 1228 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 1229 | loff_t *ppos) |
| 1230 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1231 | struct ftrace_subsystem_dir *dir = filp->private_data; |
| 1232 | struct event_subsystem *system = dir->subsystem; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1233 | struct trace_seq *s; |
| 1234 | int r; |
| 1235 | |
| 1236 | if (*ppos) |
| 1237 | return 0; |
| 1238 | |
| 1239 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 1240 | if (!s) |
| 1241 | return -ENOMEM; |
| 1242 | |
| 1243 | trace_seq_init(s); |
| 1244 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1245 | print_subsystem_event_filter(system, s); |
Steven Rostedt (Red Hat) | 5ac48378 | 2014-11-14 15:49:41 -0500 | [diff] [blame] | 1246 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
| 1247 | s->buffer, trace_seq_used(s)); |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1248 | |
| 1249 | kfree(s); |
| 1250 | |
| 1251 | return r; |
| 1252 | } |
| 1253 | |
| 1254 | static ssize_t |
| 1255 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 1256 | loff_t *ppos) |
| 1257 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1258 | struct ftrace_subsystem_dir *dir = filp->private_data; |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1259 | char *buf; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1260 | int err; |
| 1261 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1262 | if (cnt >= PAGE_SIZE) |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1263 | return -EINVAL; |
| 1264 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1265 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
| 1266 | if (!buf) |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1267 | return -ENOMEM; |
| 1268 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1269 | if (copy_from_user(buf, ubuf, cnt)) { |
| 1270 | free_page((unsigned long) buf); |
| 1271 | return -EFAULT; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1272 | } |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1273 | buf[cnt] = '\0'; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1274 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1275 | err = apply_subsystem_event_filter(dir, buf); |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1276 | free_page((unsigned long) buf); |
| 1277 | if (err < 0) |
Li Zefan | 44e9c8b | 2009-04-11 15:55:28 +0800 | [diff] [blame] | 1278 | return err; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1279 | |
| 1280 | *ppos += cnt; |
| 1281 | |
| 1282 | return cnt; |
| 1283 | } |
| 1284 | |
Steven Rostedt | d1b182a | 2009-04-15 16:53:47 -0400 | [diff] [blame] | 1285 | static ssize_t |
| 1286 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) |
| 1287 | { |
| 1288 | int (*func)(struct trace_seq *s) = filp->private_data; |
| 1289 | struct trace_seq *s; |
| 1290 | int r; |
| 1291 | |
| 1292 | if (*ppos) |
| 1293 | return 0; |
| 1294 | |
| 1295 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 1296 | if (!s) |
| 1297 | return -ENOMEM; |
| 1298 | |
| 1299 | trace_seq_init(s); |
| 1300 | |
| 1301 | func(s); |
Steven Rostedt (Red Hat) | 5ac48378 | 2014-11-14 15:49:41 -0500 | [diff] [blame] | 1302 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
| 1303 | s->buffer, trace_seq_used(s)); |
Steven Rostedt | d1b182a | 2009-04-15 16:53:47 -0400 | [diff] [blame] | 1304 | |
| 1305 | kfree(s); |
| 1306 | |
| 1307 | return r; |
| 1308 | } |
| 1309 | |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1310 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
| 1311 | static int ftrace_event_set_open(struct inode *inode, struct file *file); |
Alexander Z Lam | f77d09a | 2013-07-18 11:18:44 -0700 | [diff] [blame] | 1312 | static int ftrace_event_release(struct inode *inode, struct file *file); |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1313 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1314 | static const struct seq_operations show_event_seq_ops = { |
| 1315 | .start = t_start, |
| 1316 | .next = t_next, |
| 1317 | .show = t_show, |
| 1318 | .stop = t_stop, |
| 1319 | }; |
| 1320 | |
| 1321 | static const struct seq_operations show_set_event_seq_ops = { |
| 1322 | .start = s_start, |
| 1323 | .next = s_next, |
| 1324 | .show = t_show, |
| 1325 | .stop = t_stop, |
| 1326 | }; |
| 1327 | |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 1328 | static const struct file_operations ftrace_avail_fops = { |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1329 | .open = ftrace_event_avail_open, |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 1330 | .read = seq_read, |
| 1331 | .llseek = seq_lseek, |
| 1332 | .release = seq_release, |
| 1333 | }; |
| 1334 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1335 | static const struct file_operations ftrace_set_event_fops = { |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1336 | .open = ftrace_event_set_open, |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1337 | .read = seq_read, |
| 1338 | .write = ftrace_event_write, |
| 1339 | .llseek = seq_lseek, |
Alexander Z Lam | f77d09a | 2013-07-18 11:18:44 -0700 | [diff] [blame] | 1340 | .release = ftrace_event_release, |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1341 | }; |
| 1342 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1343 | static const struct file_operations ftrace_enable_fops = { |
Oleg Nesterov | bf682c3 | 2013-07-28 20:35:27 +0200 | [diff] [blame] | 1344 | .open = tracing_open_generic, |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1345 | .read = event_enable_read, |
| 1346 | .write = event_enable_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1347 | .llseek = default_llseek, |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1348 | }; |
| 1349 | |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 1350 | static const struct file_operations ftrace_event_format_fops = { |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1351 | .open = trace_format_open, |
| 1352 | .read = seq_read, |
| 1353 | .llseek = seq_lseek, |
| 1354 | .release = seq_release, |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 1355 | }; |
| 1356 | |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1357 | static const struct file_operations ftrace_event_id_fops = { |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1358 | .read = event_id_read, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1359 | .llseek = default_llseek, |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1360 | }; |
| 1361 | |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1362 | static const struct file_operations ftrace_event_filter_fops = { |
| 1363 | .open = tracing_open_generic, |
| 1364 | .read = event_filter_read, |
| 1365 | .write = event_filter_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1366 | .llseek = default_llseek, |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1367 | }; |
| 1368 | |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1369 | static const struct file_operations ftrace_subsystem_filter_fops = { |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1370 | .open = subsystem_open, |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1371 | .read = subsystem_filter_read, |
| 1372 | .write = subsystem_filter_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1373 | .llseek = default_llseek, |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1374 | .release = subsystem_release, |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1375 | }; |
| 1376 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1377 | static const struct file_operations ftrace_system_enable_fops = { |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 1378 | .open = subsystem_open, |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1379 | .read = system_enable_read, |
| 1380 | .write = system_enable_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1381 | .llseek = default_llseek, |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 1382 | .release = subsystem_release, |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1383 | }; |
| 1384 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1385 | static const struct file_operations ftrace_tr_enable_fops = { |
| 1386 | .open = system_tr_open, |
| 1387 | .read = system_enable_read, |
| 1388 | .write = system_enable_write, |
| 1389 | .llseek = default_llseek, |
| 1390 | .release = subsystem_release, |
| 1391 | }; |
| 1392 | |
Steven Rostedt | d1b182a | 2009-04-15 16:53:47 -0400 | [diff] [blame] | 1393 | static const struct file_operations ftrace_show_header_fops = { |
| 1394 | .open = tracing_open_generic, |
| 1395 | .read = show_header, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1396 | .llseek = default_llseek, |
Steven Rostedt | d1b182a | 2009-04-15 16:53:47 -0400 | [diff] [blame] | 1397 | }; |
| 1398 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1399 | static int |
| 1400 | ftrace_event_open(struct inode *inode, struct file *file, |
| 1401 | const struct seq_operations *seq_ops) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1402 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1403 | struct seq_file *m; |
| 1404 | int ret; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1405 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1406 | ret = seq_open(file, seq_ops); |
| 1407 | if (ret < 0) |
| 1408 | return ret; |
| 1409 | m = file->private_data; |
| 1410 | /* copy tr over to seq ops */ |
| 1411 | m->private = inode->i_private; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1412 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1413 | return ret; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1414 | } |
| 1415 | |
Alexander Z Lam | f77d09a | 2013-07-18 11:18:44 -0700 | [diff] [blame] | 1416 | static int ftrace_event_release(struct inode *inode, struct file *file) |
| 1417 | { |
| 1418 | struct trace_array *tr = inode->i_private; |
| 1419 | |
| 1420 | trace_array_put(tr); |
| 1421 | |
| 1422 | return seq_release(inode, file); |
| 1423 | } |
| 1424 | |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1425 | static int |
| 1426 | ftrace_event_avail_open(struct inode *inode, struct file *file) |
| 1427 | { |
| 1428 | const struct seq_operations *seq_ops = &show_event_seq_ops; |
| 1429 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1430 | return ftrace_event_open(inode, file, seq_ops); |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1431 | } |
| 1432 | |
| 1433 | static int |
| 1434 | ftrace_event_set_open(struct inode *inode, struct file *file) |
| 1435 | { |
| 1436 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1437 | struct trace_array *tr = inode->i_private; |
Alexander Z Lam | f77d09a | 2013-07-18 11:18:44 -0700 | [diff] [blame] | 1438 | int ret; |
| 1439 | |
| 1440 | if (trace_array_get(tr) < 0) |
| 1441 | return -ENODEV; |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1442 | |
| 1443 | if ((file->f_mode & FMODE_WRITE) && |
| 1444 | (file->f_flags & O_TRUNC)) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1445 | ftrace_clear_events(tr); |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1446 | |
Alexander Z Lam | f77d09a | 2013-07-18 11:18:44 -0700 | [diff] [blame] | 1447 | ret = ftrace_event_open(inode, file, seq_ops); |
| 1448 | if (ret < 0) |
| 1449 | trace_array_put(tr); |
| 1450 | return ret; |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1451 | } |
| 1452 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1453 | static struct event_subsystem * |
| 1454 | create_new_subsystem(const char *name) |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1455 | { |
| 1456 | struct event_subsystem *system; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1457 | |
| 1458 | /* need to create new entry */ |
| 1459 | system = kmalloc(sizeof(*system), GFP_KERNEL); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1460 | if (!system) |
| 1461 | return NULL; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1462 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1463 | system->ref_count = 1; |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 1464 | |
| 1465 | /* Only allocate if dynamic (kprobes and modules) */ |
| 1466 | if (!core_kernel_data((unsigned long)name)) { |
| 1467 | system->ref_count |= SYSTEM_FL_FREE_NAME; |
| 1468 | system->name = kstrdup(name, GFP_KERNEL); |
| 1469 | if (!system->name) |
| 1470 | goto out_free; |
| 1471 | } else |
| 1472 | system->name = name; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1473 | |
Tom Zanussi | 30e673b | 2009-04-28 03:04:47 -0500 | [diff] [blame] | 1474 | system->filter = NULL; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1475 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1476 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1477 | if (!system->filter) |
| 1478 | goto out_free; |
| 1479 | |
| 1480 | list_add(&system->list, &event_subsystems); |
| 1481 | |
| 1482 | return system; |
| 1483 | |
| 1484 | out_free: |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 1485 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
| 1486 | kfree(system->name); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1487 | kfree(system); |
| 1488 | return NULL; |
| 1489 | } |
| 1490 | |
| 1491 | static struct dentry * |
| 1492 | event_subsystem_dir(struct trace_array *tr, const char *name, |
| 1493 | struct ftrace_event_file *file, struct dentry *parent) |
| 1494 | { |
| 1495 | struct ftrace_subsystem_dir *dir; |
| 1496 | struct event_subsystem *system; |
| 1497 | struct dentry *entry; |
| 1498 | |
| 1499 | /* First see if we did not already create this dir */ |
| 1500 | list_for_each_entry(dir, &tr->systems, list) { |
| 1501 | system = dir->subsystem; |
| 1502 | if (strcmp(system->name, name) == 0) { |
| 1503 | dir->nr_events++; |
| 1504 | file->system = dir; |
| 1505 | return dir->entry; |
| 1506 | } |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1507 | } |
| 1508 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1509 | /* Now see if the system itself exists. */ |
| 1510 | list_for_each_entry(system, &event_subsystems, list) { |
| 1511 | if (strcmp(system->name, name) == 0) |
| 1512 | break; |
| 1513 | } |
| 1514 | /* Reset system variable when not found */ |
| 1515 | if (&system->list == &event_subsystems) |
| 1516 | system = NULL; |
| 1517 | |
| 1518 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
| 1519 | if (!dir) |
| 1520 | goto out_fail; |
| 1521 | |
| 1522 | if (!system) { |
| 1523 | system = create_new_subsystem(name); |
| 1524 | if (!system) |
| 1525 | goto out_free; |
| 1526 | } else |
| 1527 | __get_system(system); |
| 1528 | |
| 1529 | dir->entry = debugfs_create_dir(name, parent); |
| 1530 | if (!dir->entry) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 1531 | pr_warn("Failed to create system directory %s\n", name); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1532 | __put_system(system); |
| 1533 | goto out_free; |
| 1534 | } |
| 1535 | |
| 1536 | dir->tr = tr; |
| 1537 | dir->ref_count = 1; |
| 1538 | dir->nr_events = 1; |
| 1539 | dir->subsystem = system; |
| 1540 | file->system = dir; |
| 1541 | |
| 1542 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
Tom Zanussi | e1112b4 | 2009-03-31 00:48:49 -0500 | [diff] [blame] | 1543 | &ftrace_subsystem_filter_fops); |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1544 | if (!entry) { |
| 1545 | kfree(system->filter); |
| 1546 | system->filter = NULL; |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 1547 | pr_warn("Could not create debugfs '%s/filter' entry\n", name); |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1548 | } |
Tom Zanussi | e1112b4 | 2009-03-31 00:48:49 -0500 | [diff] [blame] | 1549 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1550 | trace_create_file("enable", 0644, dir->entry, dir, |
Frederic Weisbecker | f3f3f00 | 2009-09-24 15:27:41 +0200 | [diff] [blame] | 1551 | &ftrace_system_enable_fops); |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1552 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1553 | list_add(&dir->list, &tr->systems); |
| 1554 | |
| 1555 | return dir->entry; |
| 1556 | |
| 1557 | out_free: |
| 1558 | kfree(dir); |
| 1559 | out_fail: |
| 1560 | /* Only print this message if failed on memory allocation */ |
| 1561 | if (!dir || !system) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 1562 | pr_warn("No memory to create event subsystem %s\n", name); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1563 | return NULL; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1564 | } |
| 1565 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1566 | static int |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 1567 | event_create_dir(struct dentry *parent, struct ftrace_event_file *file) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1568 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1569 | struct ftrace_event_call *call = file->event_call; |
| 1570 | struct trace_array *tr = file->tr; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 1571 | struct list_head *head; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1572 | struct dentry *d_events; |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 1573 | const char *name; |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 1574 | int ret; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1575 | |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1576 | /* |
| 1577 | * If the trace point header did not define TRACE_SYSTEM |
| 1578 | * then the system would be called "TRACE_SYSTEM". |
| 1579 | */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1580 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
| 1581 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); |
| 1582 | if (!d_events) |
| 1583 | return -ENOMEM; |
| 1584 | } else |
| 1585 | d_events = parent; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1586 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 1587 | name = ftrace_event_name(call); |
| 1588 | file->dir = debugfs_create_dir(name, d_events); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1589 | if (!file->dir) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 1590 | pr_warn("Could not create debugfs '%s' directory\n", name); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1591 | return -1; |
| 1592 | } |
| 1593 | |
Steven Rostedt | 9b63776 | 2012-05-10 15:55:43 -0400 | [diff] [blame] | 1594 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1595 | trace_create_file("enable", 0644, file->dir, file, |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 1596 | &ftrace_enable_fops); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1597 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1598 | #ifdef CONFIG_PERF_EVENTS |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 1599 | if (call->event.type && call->class->reg) |
Oleg Nesterov | 1a11126 | 2013-07-26 19:25:32 +0200 | [diff] [blame] | 1600 | trace_create_file("id", 0444, file->dir, |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 1601 | (void *)(long)call->event.type, |
| 1602 | &ftrace_event_id_fops); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1603 | #endif |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1604 | |
Li Zefan | c9d932c | 2010-05-24 16:24:28 +0800 | [diff] [blame] | 1605 | /* |
| 1606 | * Other events may have the same class. Only update |
| 1607 | * the fields if they are not already defined. |
| 1608 | */ |
| 1609 | head = trace_get_fields(call); |
| 1610 | if (list_empty(head)) { |
| 1611 | ret = call->class->define_fields(call); |
| 1612 | if (ret < 0) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 1613 | pr_warn("Could not initialize trace point events/%s\n", |
| 1614 | name); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1615 | return -1; |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 1616 | } |
| 1617 | } |
Tom Zanussi | f306cc8 | 2013-10-24 08:34:17 -0500 | [diff] [blame] | 1618 | trace_create_file("filter", 0644, file->dir, file, |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 1619 | &ftrace_event_filter_fops); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 1620 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 1621 | trace_create_file("trigger", 0644, file->dir, file, |
| 1622 | &event_trigger_fops); |
| 1623 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1624 | trace_create_file("format", 0444, file->dir, call, |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 1625 | &ftrace_event_format_fops); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 1626 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1627 | return 0; |
| 1628 | } |
| 1629 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1630 | static void remove_event_from_tracers(struct ftrace_event_call *call) |
| 1631 | { |
| 1632 | struct ftrace_event_file *file; |
| 1633 | struct trace_array *tr; |
| 1634 | |
| 1635 | do_for_each_event_file_safe(tr, file) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1636 | if (file->event_call != call) |
| 1637 | continue; |
| 1638 | |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 1639 | remove_event_file_dir(file); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1640 | /* |
| 1641 | * The do_for_each_event_file_safe() is |
| 1642 | * a double loop. After finding the call for this |
| 1643 | * trace_array, we use break to jump to the next |
| 1644 | * trace_array. |
| 1645 | */ |
| 1646 | break; |
| 1647 | } while_for_each_event_file(); |
| 1648 | } |
| 1649 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1650 | static void event_remove(struct ftrace_event_call *call) |
| 1651 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1652 | struct trace_array *tr; |
| 1653 | struct ftrace_event_file *file; |
| 1654 | |
| 1655 | do_for_each_event_file(tr, file) { |
| 1656 | if (file->event_call != call) |
| 1657 | continue; |
| 1658 | ftrace_event_enable_disable(file, 0); |
| 1659 | /* |
| 1660 | * The do_for_each_event_file() is |
| 1661 | * a double loop. After finding the call for this |
| 1662 | * trace_array, we use break to jump to the next |
| 1663 | * trace_array. |
| 1664 | */ |
| 1665 | break; |
| 1666 | } while_for_each_event_file(); |
| 1667 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1668 | if (call->event.funcs) |
| 1669 | __unregister_ftrace_event(&call->event); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1670 | remove_event_from_tracers(call); |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1671 | list_del(&call->list); |
| 1672 | } |
| 1673 | |
| 1674 | static int event_init(struct ftrace_event_call *call) |
| 1675 | { |
| 1676 | int ret = 0; |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 1677 | const char *name; |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1678 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 1679 | name = ftrace_event_name(call); |
| 1680 | if (WARN_ON(!name)) |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1681 | return -EINVAL; |
| 1682 | |
| 1683 | if (call->class->raw_init) { |
| 1684 | ret = call->class->raw_init(call); |
| 1685 | if (ret < 0 && ret != -ENOSYS) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 1686 | pr_warn("Could not initialize trace events/%s\n", name); |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1687 | } |
| 1688 | |
| 1689 | return ret; |
| 1690 | } |
| 1691 | |
Li Zefan | 67ead0a | 2010-05-24 16:25:13 +0800 | [diff] [blame] | 1692 | static int |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1693 | __register_event(struct ftrace_event_call *call, struct module *mod) |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1694 | { |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1695 | int ret; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1696 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1697 | ret = event_init(call); |
| 1698 | if (ret < 0) |
| 1699 | return ret; |
Steven Rostedt | 701970b | 2009-04-24 23:11:22 -0400 | [diff] [blame] | 1700 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1701 | list_add(&call->list, &ftrace_events); |
Li Zefan | 67ead0a | 2010-05-24 16:25:13 +0800 | [diff] [blame] | 1702 | call->mod = mod; |
Masami Hiramatsu | 88f70d7 | 2009-09-25 11:20:54 -0700 | [diff] [blame] | 1703 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1704 | return 0; |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1705 | } |
| 1706 | |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 1707 | static struct ftrace_event_file * |
| 1708 | trace_create_new_event(struct ftrace_event_call *call, |
| 1709 | struct trace_array *tr) |
| 1710 | { |
| 1711 | struct ftrace_event_file *file; |
| 1712 | |
| 1713 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); |
| 1714 | if (!file) |
| 1715 | return NULL; |
| 1716 | |
| 1717 | file->event_call = call; |
| 1718 | file->tr = tr; |
| 1719 | atomic_set(&file->sm_ref, 0); |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 1720 | atomic_set(&file->tm_ref, 0); |
| 1721 | INIT_LIST_HEAD(&file->triggers); |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 1722 | list_add(&file->list, &tr->events); |
| 1723 | |
| 1724 | return file; |
| 1725 | } |
| 1726 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1727 | /* Add an event to a trace directory */ |
| 1728 | static int |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 1729 | __trace_add_new_event(struct ftrace_event_call *call, struct trace_array *tr) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1730 | { |
| 1731 | struct ftrace_event_file *file; |
| 1732 | |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 1733 | file = trace_create_new_event(call, tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1734 | if (!file) |
| 1735 | return -ENOMEM; |
| 1736 | |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 1737 | return event_create_dir(tr->event_dir, file); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1738 | } |
| 1739 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 1740 | /* |
| 1741 | * Just create a decriptor for early init. A descriptor is required |
| 1742 | * for enabling events at boot. We want to enable events before |
| 1743 | * the filesystem is initialized. |
| 1744 | */ |
| 1745 | static __init int |
| 1746 | __trace_early_add_new_event(struct ftrace_event_call *call, |
| 1747 | struct trace_array *tr) |
| 1748 | { |
| 1749 | struct ftrace_event_file *file; |
| 1750 | |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 1751 | file = trace_create_new_event(call, tr); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 1752 | if (!file) |
| 1753 | return -ENOMEM; |
| 1754 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 1755 | return 0; |
| 1756 | } |
| 1757 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1758 | struct ftrace_module_file_ops; |
Oleg Nesterov | 779c5e3 | 2013-07-31 19:31:32 +0200 | [diff] [blame] | 1759 | static void __add_event_to_tracers(struct ftrace_event_call *call); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1760 | |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1761 | /* Add an additional event_call dynamically */ |
| 1762 | int trace_add_event_call(struct ftrace_event_call *call) |
| 1763 | { |
| 1764 | int ret; |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 1765 | mutex_lock(&trace_types_lock); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1766 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1767 | |
| 1768 | ret = __register_event(call, NULL); |
| 1769 | if (ret >= 0) |
Oleg Nesterov | 779c5e3 | 2013-07-31 19:31:32 +0200 | [diff] [blame] | 1770 | __add_event_to_tracers(call); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1771 | |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1772 | mutex_unlock(&event_mutex); |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 1773 | mutex_unlock(&trace_types_lock); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1774 | return ret; |
| 1775 | } |
Steven Rostedt | 701970b | 2009-04-24 23:11:22 -0400 | [diff] [blame] | 1776 | |
Masami Hiramatsu | 4fead8e | 2009-09-14 16:49:12 -0400 | [diff] [blame] | 1777 | /* |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 1778 | * Must be called under locking of trace_types_lock, event_mutex and |
| 1779 | * trace_event_sem. |
Masami Hiramatsu | 4fead8e | 2009-09-14 16:49:12 -0400 | [diff] [blame] | 1780 | */ |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1781 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
| 1782 | { |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1783 | event_remove(call); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1784 | trace_destroy_fields(call); |
Oleg Nesterov | 5737574 | 2014-07-15 20:48:16 +0200 | [diff] [blame] | 1785 | free_event_filter(call->filter); |
| 1786 | call->filter = NULL; |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1787 | } |
| 1788 | |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 1789 | static int probe_remove_event_call(struct ftrace_event_call *call) |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1790 | { |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 1791 | struct trace_array *tr; |
| 1792 | struct ftrace_event_file *file; |
| 1793 | |
| 1794 | #ifdef CONFIG_PERF_EVENTS |
| 1795 | if (call->perf_refcount) |
| 1796 | return -EBUSY; |
| 1797 | #endif |
| 1798 | do_for_each_event_file(tr, file) { |
| 1799 | if (file->event_call != call) |
| 1800 | continue; |
| 1801 | /* |
| 1802 | * We can't rely on ftrace_event_enable_disable(enable => 0) |
| 1803 | * we are going to do, FTRACE_EVENT_FL_SOFT_MODE can suppress |
| 1804 | * TRACE_REG_UNREGISTER. |
| 1805 | */ |
| 1806 | if (file->flags & FTRACE_EVENT_FL_ENABLED) |
| 1807 | return -EBUSY; |
Steven Rostedt (Red Hat) | 2ba6403 | 2013-07-31 13:16:22 -0400 | [diff] [blame] | 1808 | /* |
| 1809 | * The do_for_each_event_file_safe() is |
| 1810 | * a double loop. After finding the call for this |
| 1811 | * trace_array, we use break to jump to the next |
| 1812 | * trace_array. |
| 1813 | */ |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 1814 | break; |
| 1815 | } while_for_each_event_file(); |
| 1816 | |
| 1817 | __trace_remove_event_call(call); |
| 1818 | |
| 1819 | return 0; |
| 1820 | } |
| 1821 | |
| 1822 | /* Remove an event_call */ |
| 1823 | int trace_remove_event_call(struct ftrace_event_call *call) |
| 1824 | { |
| 1825 | int ret; |
| 1826 | |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 1827 | mutex_lock(&trace_types_lock); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1828 | mutex_lock(&event_mutex); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 1829 | down_write(&trace_event_sem); |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 1830 | ret = probe_remove_event_call(call); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 1831 | up_write(&trace_event_sem); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1832 | mutex_unlock(&event_mutex); |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 1833 | mutex_unlock(&trace_types_lock); |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 1834 | |
| 1835 | return ret; |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1836 | } |
| 1837 | |
| 1838 | #define for_each_event(event, start, end) \ |
| 1839 | for (event = start; \ |
| 1840 | (unsigned long)event < (unsigned long)end; \ |
| 1841 | event++) |
| 1842 | |
| 1843 | #ifdef CONFIG_MODULES |
| 1844 | |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1845 | static void trace_module_add_events(struct module *mod) |
| 1846 | { |
Steven Rostedt | e4a9ea5 | 2011-01-27 09:15:30 -0500 | [diff] [blame] | 1847 | struct ftrace_event_call **call, **start, **end; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1848 | |
Steven Rostedt (Red Hat) | 45ab281 | 2014-02-26 13:37:38 -0500 | [diff] [blame] | 1849 | if (!mod->num_trace_events) |
| 1850 | return; |
| 1851 | |
| 1852 | /* Don't add infrastructure for mods without tracepoints */ |
| 1853 | if (trace_module_has_bad_taint(mod)) { |
| 1854 | pr_err("%s: module has bad taint, not creating trace events\n", |
| 1855 | mod->name); |
| 1856 | return; |
| 1857 | } |
| 1858 | |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1859 | start = mod->trace_events; |
| 1860 | end = mod->trace_events + mod->num_trace_events; |
| 1861 | |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1862 | for_each_event(call, start, end) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1863 | __register_event(*call, mod); |
Oleg Nesterov | 779c5e3 | 2013-07-31 19:31:32 +0200 | [diff] [blame] | 1864 | __add_event_to_tracers(*call); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1865 | } |
| 1866 | } |
| 1867 | |
| 1868 | static void trace_module_remove_events(struct module *mod) |
| 1869 | { |
| 1870 | struct ftrace_event_call *call, *p; |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 1871 | bool clear_trace = false; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1872 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 1873 | down_write(&trace_event_sem); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1874 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
| 1875 | if (call->mod == mod) { |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 1876 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
| 1877 | clear_trace = true; |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1878 | __trace_remove_event_call(call); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1879 | } |
| 1880 | } |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 1881 | up_write(&trace_event_sem); |
Steven Rostedt | 9456f0f | 2009-05-06 21:54:09 -0400 | [diff] [blame] | 1882 | |
| 1883 | /* |
| 1884 | * It is safest to reset the ring buffer if the module being unloaded |
Steven Rostedt (Red Hat) | 873c642 | 2013-03-04 23:26:06 -0500 | [diff] [blame] | 1885 | * registered any events that were used. The only worry is if |
| 1886 | * a new module gets loaded, and takes on the same id as the events |
| 1887 | * of this module. When printing out the buffer, traced events left |
| 1888 | * over from this module may be passed to the new module events and |
| 1889 | * unexpected results may occur. |
Steven Rostedt | 9456f0f | 2009-05-06 21:54:09 -0400 | [diff] [blame] | 1890 | */ |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 1891 | if (clear_trace) |
Steven Rostedt (Red Hat) | 873c642 | 2013-03-04 23:26:06 -0500 | [diff] [blame] | 1892 | tracing_reset_all_online_cpus(); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1893 | } |
| 1894 | |
Steven Rostedt | 61f919a | 2009-04-14 18:22:32 -0400 | [diff] [blame] | 1895 | static int trace_module_notify(struct notifier_block *self, |
| 1896 | unsigned long val, void *data) |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1897 | { |
| 1898 | struct module *mod = data; |
| 1899 | |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 1900 | mutex_lock(&trace_types_lock); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1901 | mutex_lock(&event_mutex); |
| 1902 | switch (val) { |
| 1903 | case MODULE_STATE_COMING: |
| 1904 | trace_module_add_events(mod); |
| 1905 | break; |
| 1906 | case MODULE_STATE_GOING: |
| 1907 | trace_module_remove_events(mod); |
| 1908 | break; |
| 1909 | } |
| 1910 | mutex_unlock(&event_mutex); |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 1911 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1912 | |
| 1913 | return 0; |
| 1914 | } |
Steven Rostedt (Red Hat) | 315326c | 2013-03-02 17:37:14 -0500 | [diff] [blame] | 1915 | |
Oleg Nesterov | 836d481 | 2013-07-31 19:31:37 +0200 | [diff] [blame] | 1916 | static struct notifier_block trace_module_nb = { |
| 1917 | .notifier_call = trace_module_notify, |
| 1918 | .priority = 0, |
| 1919 | }; |
Steven Rostedt | 61f919a | 2009-04-14 18:22:32 -0400 | [diff] [blame] | 1920 | #endif /* CONFIG_MODULES */ |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1921 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1922 | /* Create a new event directory structure for a trace directory. */ |
| 1923 | static void |
| 1924 | __trace_add_event_dirs(struct trace_array *tr) |
| 1925 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1926 | struct ftrace_event_call *call; |
| 1927 | int ret; |
| 1928 | |
| 1929 | list_for_each_entry(call, &ftrace_events, list) { |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 1930 | ret = __trace_add_new_event(call, tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1931 | if (ret < 0) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 1932 | pr_warn("Could not create directory for event %s\n", |
| 1933 | ftrace_event_name(call)); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1934 | } |
| 1935 | } |
| 1936 | |
Tom Zanussi | 7862ad1 | 2013-10-24 08:59:28 -0500 | [diff] [blame] | 1937 | struct ftrace_event_file * |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 1938 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
| 1939 | { |
| 1940 | struct ftrace_event_file *file; |
| 1941 | struct ftrace_event_call *call; |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 1942 | const char *name; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 1943 | |
| 1944 | list_for_each_entry(file, &tr->events, list) { |
| 1945 | |
| 1946 | call = file->event_call; |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 1947 | name = ftrace_event_name(call); |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 1948 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 1949 | if (!name || !call->class || !call->class->reg) |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 1950 | continue; |
| 1951 | |
| 1952 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
| 1953 | continue; |
| 1954 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 1955 | if (strcmp(event, name) == 0 && |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 1956 | strcmp(system, call->class->system) == 0) |
| 1957 | return file; |
| 1958 | } |
| 1959 | return NULL; |
| 1960 | } |
| 1961 | |
Steven Rostedt (Red Hat) | 2875a08 | 2013-12-20 23:23:05 -0500 | [diff] [blame] | 1962 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 1963 | |
| 1964 | /* Avoid typos */ |
| 1965 | #define ENABLE_EVENT_STR "enable_event" |
| 1966 | #define DISABLE_EVENT_STR "disable_event" |
| 1967 | |
| 1968 | struct event_probe_data { |
| 1969 | struct ftrace_event_file *file; |
| 1970 | unsigned long count; |
| 1971 | int ref; |
| 1972 | bool enable; |
| 1973 | }; |
| 1974 | |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 1975 | static void |
| 1976 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) |
| 1977 | { |
| 1978 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 1979 | struct event_probe_data *data = *pdata; |
| 1980 | |
| 1981 | if (!data) |
| 1982 | return; |
| 1983 | |
| 1984 | if (data->enable) |
| 1985 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); |
| 1986 | else |
| 1987 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); |
| 1988 | } |
| 1989 | |
| 1990 | static void |
| 1991 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) |
| 1992 | { |
| 1993 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 1994 | struct event_probe_data *data = *pdata; |
| 1995 | |
| 1996 | if (!data) |
| 1997 | return; |
| 1998 | |
| 1999 | if (!data->count) |
| 2000 | return; |
| 2001 | |
| 2002 | /* Skip if the event is in a state we want to switch to */ |
| 2003 | if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED)) |
| 2004 | return; |
| 2005 | |
| 2006 | if (data->count != -1) |
| 2007 | (data->count)--; |
| 2008 | |
| 2009 | event_enable_probe(ip, parent_ip, _data); |
| 2010 | } |
| 2011 | |
| 2012 | static int |
| 2013 | event_enable_print(struct seq_file *m, unsigned long ip, |
| 2014 | struct ftrace_probe_ops *ops, void *_data) |
| 2015 | { |
| 2016 | struct event_probe_data *data = _data; |
| 2017 | |
| 2018 | seq_printf(m, "%ps:", (void *)ip); |
| 2019 | |
| 2020 | seq_printf(m, "%s:%s:%s", |
| 2021 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, |
| 2022 | data->file->event_call->class->system, |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 2023 | ftrace_event_name(data->file->event_call)); |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2024 | |
| 2025 | if (data->count == -1) |
Rasmus Villemoes | fa6f0cc | 2014-11-08 21:42:10 +0100 | [diff] [blame] | 2026 | seq_puts(m, ":unlimited\n"); |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2027 | else |
| 2028 | seq_printf(m, ":count=%ld\n", data->count); |
| 2029 | |
| 2030 | return 0; |
| 2031 | } |
| 2032 | |
| 2033 | static int |
| 2034 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, |
| 2035 | void **_data) |
| 2036 | { |
| 2037 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 2038 | struct event_probe_data *data = *pdata; |
| 2039 | |
| 2040 | data->ref++; |
| 2041 | return 0; |
| 2042 | } |
| 2043 | |
| 2044 | static void |
| 2045 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, |
| 2046 | void **_data) |
| 2047 | { |
| 2048 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 2049 | struct event_probe_data *data = *pdata; |
| 2050 | |
| 2051 | if (WARN_ON_ONCE(data->ref <= 0)) |
| 2052 | return; |
| 2053 | |
| 2054 | data->ref--; |
| 2055 | if (!data->ref) { |
| 2056 | /* Remove the SOFT_MODE flag */ |
| 2057 | __ftrace_event_enable_disable(data->file, 0, 1); |
| 2058 | module_put(data->file->event_call->mod); |
| 2059 | kfree(data); |
| 2060 | } |
| 2061 | *pdata = NULL; |
| 2062 | } |
| 2063 | |
| 2064 | static struct ftrace_probe_ops event_enable_probe_ops = { |
| 2065 | .func = event_enable_probe, |
| 2066 | .print = event_enable_print, |
| 2067 | .init = event_enable_init, |
| 2068 | .free = event_enable_free, |
| 2069 | }; |
| 2070 | |
| 2071 | static struct ftrace_probe_ops event_enable_count_probe_ops = { |
| 2072 | .func = event_enable_count_probe, |
| 2073 | .print = event_enable_print, |
| 2074 | .init = event_enable_init, |
| 2075 | .free = event_enable_free, |
| 2076 | }; |
| 2077 | |
| 2078 | static struct ftrace_probe_ops event_disable_probe_ops = { |
| 2079 | .func = event_enable_probe, |
| 2080 | .print = event_enable_print, |
| 2081 | .init = event_enable_init, |
| 2082 | .free = event_enable_free, |
| 2083 | }; |
| 2084 | |
| 2085 | static struct ftrace_probe_ops event_disable_count_probe_ops = { |
| 2086 | .func = event_enable_count_probe, |
| 2087 | .print = event_enable_print, |
| 2088 | .init = event_enable_init, |
| 2089 | .free = event_enable_free, |
| 2090 | }; |
| 2091 | |
| 2092 | static int |
| 2093 | event_enable_func(struct ftrace_hash *hash, |
| 2094 | char *glob, char *cmd, char *param, int enabled) |
| 2095 | { |
| 2096 | struct trace_array *tr = top_trace_array(); |
| 2097 | struct ftrace_event_file *file; |
| 2098 | struct ftrace_probe_ops *ops; |
| 2099 | struct event_probe_data *data; |
| 2100 | const char *system; |
| 2101 | const char *event; |
| 2102 | char *number; |
| 2103 | bool enable; |
| 2104 | int ret; |
| 2105 | |
Yoshihiro YUNOMAE | dc81e5e | 2014-06-06 07:35:17 +0900 | [diff] [blame] | 2106 | if (!tr) |
| 2107 | return -ENODEV; |
| 2108 | |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2109 | /* hash funcs only work with set_ftrace_filter */ |
Harsh Prateek Bora | 8092e80 | 2013-05-24 12:52:17 +0530 | [diff] [blame] | 2110 | if (!enabled || !param) |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2111 | return -EINVAL; |
| 2112 | |
| 2113 | system = strsep(¶m, ":"); |
| 2114 | if (!param) |
| 2115 | return -EINVAL; |
| 2116 | |
| 2117 | event = strsep(¶m, ":"); |
| 2118 | |
| 2119 | mutex_lock(&event_mutex); |
| 2120 | |
| 2121 | ret = -EINVAL; |
| 2122 | file = find_event_file(tr, system, event); |
| 2123 | if (!file) |
| 2124 | goto out; |
| 2125 | |
| 2126 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; |
| 2127 | |
| 2128 | if (enable) |
| 2129 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; |
| 2130 | else |
| 2131 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; |
| 2132 | |
| 2133 | if (glob[0] == '!') { |
| 2134 | unregister_ftrace_function_probe_func(glob+1, ops); |
| 2135 | ret = 0; |
| 2136 | goto out; |
| 2137 | } |
| 2138 | |
| 2139 | ret = -ENOMEM; |
| 2140 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
| 2141 | if (!data) |
| 2142 | goto out; |
| 2143 | |
| 2144 | data->enable = enable; |
| 2145 | data->count = -1; |
| 2146 | data->file = file; |
| 2147 | |
| 2148 | if (!param) |
| 2149 | goto out_reg; |
| 2150 | |
| 2151 | number = strsep(¶m, ":"); |
| 2152 | |
| 2153 | ret = -EINVAL; |
| 2154 | if (!strlen(number)) |
| 2155 | goto out_free; |
| 2156 | |
| 2157 | /* |
| 2158 | * We use the callback data field (which is a pointer) |
| 2159 | * as our counter. |
| 2160 | */ |
| 2161 | ret = kstrtoul(number, 0, &data->count); |
| 2162 | if (ret) |
| 2163 | goto out_free; |
| 2164 | |
| 2165 | out_reg: |
| 2166 | /* Don't let event modules unload while probe registered */ |
| 2167 | ret = try_module_get(file->event_call->mod); |
Masami Hiramatsu | 6ed0106 | 2013-05-16 20:48:49 +0900 | [diff] [blame] | 2168 | if (!ret) { |
| 2169 | ret = -EBUSY; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2170 | goto out_free; |
Masami Hiramatsu | 6ed0106 | 2013-05-16 20:48:49 +0900 | [diff] [blame] | 2171 | } |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2172 | |
| 2173 | ret = __ftrace_event_enable_disable(file, 1, 1); |
| 2174 | if (ret < 0) |
| 2175 | goto out_put; |
| 2176 | ret = register_ftrace_function_probe(glob, ops, data); |
Steven Rostedt (Red Hat) | ff305de | 2013-05-09 11:30:26 -0400 | [diff] [blame] | 2177 | /* |
| 2178 | * The above returns on success the # of functions enabled, |
| 2179 | * but if it didn't find any functions it returns zero. |
| 2180 | * Consider no functions a failure too. |
| 2181 | */ |
Masami Hiramatsu | a5b85bd | 2013-05-09 14:44:14 +0900 | [diff] [blame] | 2182 | if (!ret) { |
| 2183 | ret = -ENOENT; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2184 | goto out_disable; |
Steven Rostedt (Red Hat) | ff305de | 2013-05-09 11:30:26 -0400 | [diff] [blame] | 2185 | } else if (ret < 0) |
| 2186 | goto out_disable; |
| 2187 | /* Just return zero, not the number of enabled functions */ |
| 2188 | ret = 0; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2189 | out: |
| 2190 | mutex_unlock(&event_mutex); |
| 2191 | return ret; |
| 2192 | |
| 2193 | out_disable: |
| 2194 | __ftrace_event_enable_disable(file, 0, 1); |
| 2195 | out_put: |
| 2196 | module_put(file->event_call->mod); |
| 2197 | out_free: |
| 2198 | kfree(data); |
| 2199 | goto out; |
| 2200 | } |
| 2201 | |
| 2202 | static struct ftrace_func_command event_enable_cmd = { |
| 2203 | .name = ENABLE_EVENT_STR, |
| 2204 | .func = event_enable_func, |
| 2205 | }; |
| 2206 | |
| 2207 | static struct ftrace_func_command event_disable_cmd = { |
| 2208 | .name = DISABLE_EVENT_STR, |
| 2209 | .func = event_enable_func, |
| 2210 | }; |
| 2211 | |
| 2212 | static __init int register_event_cmds(void) |
| 2213 | { |
| 2214 | int ret; |
| 2215 | |
| 2216 | ret = register_ftrace_command(&event_enable_cmd); |
| 2217 | if (WARN_ON(ret < 0)) |
| 2218 | return ret; |
| 2219 | ret = register_ftrace_command(&event_disable_cmd); |
| 2220 | if (WARN_ON(ret < 0)) |
| 2221 | unregister_ftrace_command(&event_enable_cmd); |
| 2222 | return ret; |
| 2223 | } |
| 2224 | #else |
| 2225 | static inline int register_event_cmds(void) { return 0; } |
| 2226 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
| 2227 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2228 | /* |
| 2229 | * The top level array has already had its ftrace_event_file |
| 2230 | * descriptors created in order to allow for early events to |
| 2231 | * be recorded. This function is called after the debugfs has been |
| 2232 | * initialized, and we now have to create the files associated |
| 2233 | * to the events. |
| 2234 | */ |
| 2235 | static __init void |
| 2236 | __trace_early_add_event_dirs(struct trace_array *tr) |
| 2237 | { |
| 2238 | struct ftrace_event_file *file; |
| 2239 | int ret; |
| 2240 | |
| 2241 | |
| 2242 | list_for_each_entry(file, &tr->events, list) { |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 2243 | ret = event_create_dir(tr->event_dir, file); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2244 | if (ret < 0) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2245 | pr_warn("Could not create directory for event %s\n", |
| 2246 | ftrace_event_name(file->event_call)); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2247 | } |
| 2248 | } |
| 2249 | |
| 2250 | /* |
| 2251 | * For early boot up, the top trace array requires to have |
| 2252 | * a list of events that can be enabled. This must be done before |
| 2253 | * the filesystem is set up in order to allow events to be traced |
| 2254 | * early. |
| 2255 | */ |
| 2256 | static __init void |
| 2257 | __trace_early_add_events(struct trace_array *tr) |
| 2258 | { |
| 2259 | struct ftrace_event_call *call; |
| 2260 | int ret; |
| 2261 | |
| 2262 | list_for_each_entry(call, &ftrace_events, list) { |
| 2263 | /* Early boot up should not have any modules loaded */ |
| 2264 | if (WARN_ON_ONCE(call->mod)) |
| 2265 | continue; |
| 2266 | |
| 2267 | ret = __trace_early_add_new_event(call, tr); |
| 2268 | if (ret < 0) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2269 | pr_warn("Could not create early event %s\n", |
| 2270 | ftrace_event_name(call)); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2271 | } |
| 2272 | } |
| 2273 | |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2274 | /* Remove the event directory structure for a trace directory. */ |
| 2275 | static void |
| 2276 | __trace_remove_event_dirs(struct trace_array *tr) |
| 2277 | { |
| 2278 | struct ftrace_event_file *file, *next; |
| 2279 | |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 2280 | list_for_each_entry_safe(file, next, &tr->events, list) |
| 2281 | remove_event_file_dir(file); |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2282 | } |
| 2283 | |
Oleg Nesterov | 779c5e3 | 2013-07-31 19:31:32 +0200 | [diff] [blame] | 2284 | static void __add_event_to_tracers(struct ftrace_event_call *call) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2285 | { |
| 2286 | struct trace_array *tr; |
| 2287 | |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 2288 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
| 2289 | __trace_add_new_event(call, tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2290 | } |
| 2291 | |
Steven Rostedt | e4a9ea5 | 2011-01-27 09:15:30 -0500 | [diff] [blame] | 2292 | extern struct ftrace_event_call *__start_ftrace_events[]; |
| 2293 | extern struct ftrace_event_call *__stop_ftrace_events[]; |
Steven Rostedt | a59fd60 | 2009-04-10 13:52:20 -0400 | [diff] [blame] | 2294 | |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 2295 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
| 2296 | |
| 2297 | static __init int setup_trace_event(char *str) |
| 2298 | { |
| 2299 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); |
Steven Rostedt (Red Hat) | 55034cd | 2013-03-07 22:48:09 -0500 | [diff] [blame] | 2300 | ring_buffer_expanded = true; |
| 2301 | tracing_selftest_disabled = true; |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 2302 | |
| 2303 | return 1; |
| 2304 | } |
| 2305 | __setup("trace_event=", setup_trace_event); |
| 2306 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2307 | /* Expects to have event_mutex held when called */ |
| 2308 | static int |
| 2309 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2310 | { |
| 2311 | struct dentry *d_events; |
| 2312 | struct dentry *entry; |
| 2313 | |
| 2314 | entry = debugfs_create_file("set_event", 0644, parent, |
| 2315 | tr, &ftrace_set_event_fops); |
| 2316 | if (!entry) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2317 | pr_warn("Could not create debugfs 'set_event' entry\n"); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2318 | return -ENOMEM; |
| 2319 | } |
| 2320 | |
| 2321 | d_events = debugfs_create_dir("events", parent); |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2322 | if (!d_events) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2323 | pr_warn("Could not create debugfs 'events' directory\n"); |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2324 | return -ENOMEM; |
| 2325 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2326 | |
| 2327 | /* ring buffer internal formats */ |
| 2328 | trace_create_file("header_page", 0444, d_events, |
| 2329 | ring_buffer_print_page_header, |
| 2330 | &ftrace_show_header_fops); |
| 2331 | |
| 2332 | trace_create_file("header_event", 0444, d_events, |
| 2333 | ring_buffer_print_entry_header, |
| 2334 | &ftrace_show_header_fops); |
| 2335 | |
| 2336 | trace_create_file("enable", 0644, d_events, |
| 2337 | tr, &ftrace_tr_enable_fops); |
| 2338 | |
| 2339 | tr->event_dir = d_events; |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2340 | |
| 2341 | return 0; |
| 2342 | } |
| 2343 | |
| 2344 | /** |
| 2345 | * event_trace_add_tracer - add a instance of a trace_array to events |
| 2346 | * @parent: The parent dentry to place the files/directories for events in |
| 2347 | * @tr: The trace array associated with these events |
| 2348 | * |
| 2349 | * When a new instance is created, it needs to set up its events |
| 2350 | * directory, as well as other files associated with events. It also |
| 2351 | * creates the event hierachry in the @parent/events directory. |
| 2352 | * |
| 2353 | * Returns 0 on success. |
| 2354 | */ |
| 2355 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) |
| 2356 | { |
| 2357 | int ret; |
| 2358 | |
| 2359 | mutex_lock(&event_mutex); |
| 2360 | |
| 2361 | ret = create_event_toplevel_files(parent, tr); |
| 2362 | if (ret) |
| 2363 | goto out_unlock; |
| 2364 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2365 | down_write(&trace_event_sem); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2366 | __trace_add_event_dirs(tr); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2367 | up_write(&trace_event_sem); |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2368 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2369 | out_unlock: |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2370 | mutex_unlock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2371 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2372 | return ret; |
| 2373 | } |
| 2374 | |
| 2375 | /* |
| 2376 | * The top trace array already had its file descriptors created. |
| 2377 | * Now the files themselves need to be created. |
| 2378 | */ |
| 2379 | static __init int |
| 2380 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) |
| 2381 | { |
| 2382 | int ret; |
| 2383 | |
| 2384 | mutex_lock(&event_mutex); |
| 2385 | |
| 2386 | ret = create_event_toplevel_files(parent, tr); |
| 2387 | if (ret) |
| 2388 | goto out_unlock; |
| 2389 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2390 | down_write(&trace_event_sem); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2391 | __trace_early_add_event_dirs(tr); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2392 | up_write(&trace_event_sem); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2393 | |
| 2394 | out_unlock: |
| 2395 | mutex_unlock(&event_mutex); |
| 2396 | |
| 2397 | return ret; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2398 | } |
| 2399 | |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2400 | int event_trace_del_tracer(struct trace_array *tr) |
| 2401 | { |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2402 | mutex_lock(&event_mutex); |
| 2403 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 2404 | /* Disable any event triggers and associated soft-disabled events */ |
| 2405 | clear_event_triggers(tr); |
| 2406 | |
Steven Rostedt (Red Hat) | 2a6c24a | 2013-07-02 14:48:23 -0400 | [diff] [blame] | 2407 | /* Disable any running events */ |
| 2408 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); |
| 2409 | |
Steven Rostedt | 3ccb012 | 2013-12-03 12:41:20 -0500 | [diff] [blame] | 2410 | /* Access to events are within rcu_read_lock_sched() */ |
| 2411 | synchronize_sched(); |
| 2412 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2413 | down_write(&trace_event_sem); |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2414 | __trace_remove_event_dirs(tr); |
| 2415 | debugfs_remove_recursive(tr->event_dir); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2416 | up_write(&trace_event_sem); |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2417 | |
| 2418 | tr->event_dir = NULL; |
| 2419 | |
| 2420 | mutex_unlock(&event_mutex); |
| 2421 | |
| 2422 | return 0; |
| 2423 | } |
| 2424 | |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 2425 | static __init int event_trace_memsetup(void) |
| 2426 | { |
| 2427 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); |
| 2428 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); |
| 2429 | return 0; |
| 2430 | } |
| 2431 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2432 | static __init int event_trace_enable(void) |
| 2433 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2434 | struct trace_array *tr = top_trace_array(); |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2435 | struct ftrace_event_call **iter, *call; |
| 2436 | char *buf = bootup_event_buf; |
| 2437 | char *token; |
| 2438 | int ret; |
| 2439 | |
Yoshihiro YUNOMAE | dc81e5e | 2014-06-06 07:35:17 +0900 | [diff] [blame] | 2440 | if (!tr) |
| 2441 | return -ENODEV; |
| 2442 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2443 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
| 2444 | |
| 2445 | call = *iter; |
| 2446 | ret = event_init(call); |
| 2447 | if (!ret) |
| 2448 | list_add(&call->list, &ftrace_events); |
| 2449 | } |
| 2450 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2451 | /* |
| 2452 | * We need the top trace array to have a working set of trace |
| 2453 | * points at early init, before the debug files and directories |
| 2454 | * are created. Create the file entries now, and attach them |
| 2455 | * to the actual file dentries later. |
| 2456 | */ |
| 2457 | __trace_early_add_events(tr); |
| 2458 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2459 | while (true) { |
| 2460 | token = strsep(&buf, ","); |
| 2461 | |
| 2462 | if (!token) |
| 2463 | break; |
| 2464 | if (!*token) |
| 2465 | continue; |
| 2466 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2467 | ret = ftrace_set_clr_event(tr, token, 1); |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2468 | if (ret) |
| 2469 | pr_warn("Failed to enable trace event: %s\n", token); |
| 2470 | } |
Steven Rostedt | 8169883 | 2012-10-11 10:15:05 -0400 | [diff] [blame] | 2471 | |
| 2472 | trace_printk_start_comm(); |
| 2473 | |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2474 | register_event_cmds(); |
| 2475 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 2476 | register_trigger_cmds(); |
| 2477 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2478 | return 0; |
| 2479 | } |
| 2480 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2481 | static __init int event_trace_init(void) |
| 2482 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2483 | struct trace_array *tr; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2484 | struct dentry *d_tracer; |
| 2485 | struct dentry *entry; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2486 | int ret; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2487 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2488 | tr = top_trace_array(); |
Yoshihiro YUNOMAE | dc81e5e | 2014-06-06 07:35:17 +0900 | [diff] [blame] | 2489 | if (!tr) |
| 2490 | return -ENODEV; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2491 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2492 | d_tracer = tracing_init_dentry(); |
| 2493 | if (!d_tracer) |
| 2494 | return 0; |
| 2495 | |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 2496 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2497 | tr, &ftrace_avail_fops); |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 2498 | if (!entry) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2499 | pr_warn("Could not create debugfs 'available_events' entry\n"); |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 2500 | |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 2501 | if (trace_define_common_fields()) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2502 | pr_warn("tracing: Failed to allocate common fields"); |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 2503 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2504 | ret = early_event_add_tracer(d_tracer, tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2505 | if (ret) |
| 2506 | return ret; |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 2507 | |
Oleg Nesterov | 836d481 | 2013-07-31 19:31:37 +0200 | [diff] [blame] | 2508 | #ifdef CONFIG_MODULES |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2509 | ret = register_module_notifier(&trace_module_nb); |
Ming Lei | 5537937 | 2009-05-18 23:04:46 +0800 | [diff] [blame] | 2510 | if (ret) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2511 | pr_warn("Failed to register trace events module notifier\n"); |
Oleg Nesterov | 836d481 | 2013-07-31 19:31:37 +0200 | [diff] [blame] | 2512 | #endif |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2513 | return 0; |
| 2514 | } |
Steven Rostedt (Red Hat) | 5f893b2 | 2014-12-12 20:05:10 -0500 | [diff] [blame] | 2515 | |
| 2516 | void __init trace_event_init(void) |
| 2517 | { |
| 2518 | event_trace_memsetup(); |
| 2519 | init_ftrace_syscalls(); |
| 2520 | event_trace_enable(); |
| 2521 | } |
| 2522 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2523 | fs_initcall(event_trace_init); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2524 | |
| 2525 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 2526 | |
| 2527 | static DEFINE_SPINLOCK(test_spinlock); |
| 2528 | static DEFINE_SPINLOCK(test_spinlock_irq); |
| 2529 | static DEFINE_MUTEX(test_mutex); |
| 2530 | |
| 2531 | static __init void test_work(struct work_struct *dummy) |
| 2532 | { |
| 2533 | spin_lock(&test_spinlock); |
| 2534 | spin_lock_irq(&test_spinlock_irq); |
| 2535 | udelay(1); |
| 2536 | spin_unlock_irq(&test_spinlock_irq); |
| 2537 | spin_unlock(&test_spinlock); |
| 2538 | |
| 2539 | mutex_lock(&test_mutex); |
| 2540 | msleep(1); |
| 2541 | mutex_unlock(&test_mutex); |
| 2542 | } |
| 2543 | |
| 2544 | static __init int event_test_thread(void *unused) |
| 2545 | { |
| 2546 | void *test_malloc; |
| 2547 | |
| 2548 | test_malloc = kmalloc(1234, GFP_KERNEL); |
| 2549 | if (!test_malloc) |
| 2550 | pr_info("failed to kmalloc\n"); |
| 2551 | |
| 2552 | schedule_on_each_cpu(test_work); |
| 2553 | |
| 2554 | kfree(test_malloc); |
| 2555 | |
| 2556 | set_current_state(TASK_INTERRUPTIBLE); |
Peter Zijlstra | fe0e01c | 2014-10-08 18:51:10 +0200 | [diff] [blame] | 2557 | while (!kthread_should_stop()) { |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2558 | schedule(); |
Peter Zijlstra | fe0e01c | 2014-10-08 18:51:10 +0200 | [diff] [blame] | 2559 | set_current_state(TASK_INTERRUPTIBLE); |
| 2560 | } |
| 2561 | __set_current_state(TASK_RUNNING); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2562 | |
| 2563 | return 0; |
| 2564 | } |
| 2565 | |
| 2566 | /* |
| 2567 | * Do various things that may trigger events. |
| 2568 | */ |
| 2569 | static __init void event_test_stuff(void) |
| 2570 | { |
| 2571 | struct task_struct *test_thread; |
| 2572 | |
| 2573 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); |
| 2574 | msleep(1); |
| 2575 | kthread_stop(test_thread); |
| 2576 | } |
| 2577 | |
| 2578 | /* |
| 2579 | * For every trace event defined, we will test each trace point separately, |
| 2580 | * and then by groups, and finally all trace points. |
| 2581 | */ |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2582 | static __init void event_trace_self_tests(void) |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2583 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2584 | struct ftrace_subsystem_dir *dir; |
| 2585 | struct ftrace_event_file *file; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2586 | struct ftrace_event_call *call; |
| 2587 | struct event_subsystem *system; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2588 | struct trace_array *tr; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2589 | int ret; |
| 2590 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2591 | tr = top_trace_array(); |
Yoshihiro YUNOMAE | dc81e5e | 2014-06-06 07:35:17 +0900 | [diff] [blame] | 2592 | if (!tr) |
| 2593 | return; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2594 | |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2595 | pr_info("Running tests on trace events:\n"); |
| 2596 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2597 | list_for_each_entry(file, &tr->events, list) { |
| 2598 | |
| 2599 | call = file->event_call; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2600 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 2601 | /* Only test those that have a probe */ |
| 2602 | if (!call->class || !call->class->probe) |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2603 | continue; |
| 2604 | |
Steven Rostedt | 1f5a6b4 | 2009-09-14 11:58:24 -0400 | [diff] [blame] | 2605 | /* |
| 2606 | * Testing syscall events here is pretty useless, but |
| 2607 | * we still do it if configured. But this is time consuming. |
| 2608 | * What we really need is a user thread to perform the |
| 2609 | * syscalls as we test. |
| 2610 | */ |
| 2611 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 2612 | if (call->class->system && |
| 2613 | strcmp(call->class->system, "syscalls") == 0) |
Steven Rostedt | 1f5a6b4 | 2009-09-14 11:58:24 -0400 | [diff] [blame] | 2614 | continue; |
| 2615 | #endif |
| 2616 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 2617 | pr_info("Testing event %s: ", ftrace_event_name(call)); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2618 | |
| 2619 | /* |
| 2620 | * If an event is already enabled, someone is using |
| 2621 | * it and the self test should not be on. |
| 2622 | */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2623 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2624 | pr_warn("Enabled event during self test!\n"); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2625 | WARN_ON_ONCE(1); |
| 2626 | continue; |
| 2627 | } |
| 2628 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2629 | ftrace_event_enable_disable(file, 1); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2630 | event_test_stuff(); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2631 | ftrace_event_enable_disable(file, 0); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2632 | |
| 2633 | pr_cont("OK\n"); |
| 2634 | } |
| 2635 | |
| 2636 | /* Now test at the sub system level */ |
| 2637 | |
| 2638 | pr_info("Running tests on trace event systems:\n"); |
| 2639 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2640 | list_for_each_entry(dir, &tr->systems, list) { |
| 2641 | |
| 2642 | system = dir->subsystem; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2643 | |
| 2644 | /* the ftrace system is special, skip it */ |
| 2645 | if (strcmp(system->name, "ftrace") == 0) |
| 2646 | continue; |
| 2647 | |
| 2648 | pr_info("Testing event system %s: ", system->name); |
| 2649 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2650 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2651 | if (WARN_ON_ONCE(ret)) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2652 | pr_warn("error enabling system %s\n", |
| 2653 | system->name); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2654 | continue; |
| 2655 | } |
| 2656 | |
| 2657 | event_test_stuff(); |
| 2658 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2659 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
Yuanhan Liu | 76bab1b | 2012-08-27 15:13:45 +0800 | [diff] [blame] | 2660 | if (WARN_ON_ONCE(ret)) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2661 | pr_warn("error disabling system %s\n", |
| 2662 | system->name); |
Yuanhan Liu | 76bab1b | 2012-08-27 15:13:45 +0800 | [diff] [blame] | 2663 | continue; |
| 2664 | } |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2665 | |
| 2666 | pr_cont("OK\n"); |
| 2667 | } |
| 2668 | |
| 2669 | /* Test with all events enabled */ |
| 2670 | |
| 2671 | pr_info("Running tests on all trace events:\n"); |
| 2672 | pr_info("Testing all events: "); |
| 2673 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2674 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2675 | if (WARN_ON_ONCE(ret)) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2676 | pr_warn("error enabling all events\n"); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2677 | return; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2678 | } |
| 2679 | |
| 2680 | event_test_stuff(); |
| 2681 | |
| 2682 | /* reset sysname */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2683 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2684 | if (WARN_ON_ONCE(ret)) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2685 | pr_warn("error disabling all events\n"); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2686 | return; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2687 | } |
| 2688 | |
| 2689 | pr_cont("OK\n"); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2690 | } |
| 2691 | |
| 2692 | #ifdef CONFIG_FUNCTION_TRACER |
| 2693 | |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 2694 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2695 | |
| 2696 | static void |
Steven Rostedt | 2f5f6ad | 2011-08-08 16:57:47 -0400 | [diff] [blame] | 2697 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
Steven Rostedt | a1e2e31 | 2011-08-09 12:50:46 -0400 | [diff] [blame] | 2698 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2699 | { |
| 2700 | struct ring_buffer_event *event; |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 2701 | struct ring_buffer *buffer; |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2702 | struct ftrace_entry *entry; |
| 2703 | unsigned long flags; |
| 2704 | long disabled; |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2705 | int cpu; |
| 2706 | int pc; |
| 2707 | |
| 2708 | pc = preempt_count(); |
Steven Rostedt | 5168ae5 | 2010-06-03 09:36:50 -0400 | [diff] [blame] | 2709 | preempt_disable_notrace(); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2710 | cpu = raw_smp_processor_id(); |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 2711 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2712 | |
| 2713 | if (disabled != 1) |
| 2714 | goto out; |
| 2715 | |
| 2716 | local_save_flags(flags); |
| 2717 | |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 2718 | event = trace_current_buffer_lock_reserve(&buffer, |
| 2719 | TRACE_FN, sizeof(*entry), |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2720 | flags, pc); |
| 2721 | if (!event) |
| 2722 | goto out; |
| 2723 | entry = ring_buffer_event_data(event); |
| 2724 | entry->ip = ip; |
| 2725 | entry->parent_ip = parent_ip; |
| 2726 | |
Steven Rostedt | 0d5c6e1 | 2012-11-01 20:54:21 -0400 | [diff] [blame] | 2727 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2728 | |
| 2729 | out: |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 2730 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
Steven Rostedt | 5168ae5 | 2010-06-03 09:36:50 -0400 | [diff] [blame] | 2731 | preempt_enable_notrace(); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2732 | } |
| 2733 | |
| 2734 | static struct ftrace_ops trace_ops __initdata = |
| 2735 | { |
| 2736 | .func = function_test_events_call, |
Steven Rostedt | 4740974 | 2012-07-20 11:04:44 -0400 | [diff] [blame] | 2737 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2738 | }; |
| 2739 | |
| 2740 | static __init void event_trace_self_test_with_function(void) |
| 2741 | { |
Steven Rostedt | 17bb615 | 2011-05-23 15:27:46 -0400 | [diff] [blame] | 2742 | int ret; |
| 2743 | ret = register_ftrace_function(&trace_ops); |
| 2744 | if (WARN_ON(ret < 0)) { |
| 2745 | pr_info("Failed to enable function tracer for event tests\n"); |
| 2746 | return; |
| 2747 | } |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2748 | pr_info("Running tests again, along with the function tracer\n"); |
| 2749 | event_trace_self_tests(); |
| 2750 | unregister_ftrace_function(&trace_ops); |
| 2751 | } |
| 2752 | #else |
| 2753 | static __init void event_trace_self_test_with_function(void) |
| 2754 | { |
| 2755 | } |
| 2756 | #endif |
| 2757 | |
| 2758 | static __init int event_trace_self_tests_init(void) |
| 2759 | { |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 2760 | if (!tracing_selftest_disabled) { |
| 2761 | event_trace_self_tests(); |
| 2762 | event_trace_self_test_with_function(); |
| 2763 | } |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2764 | |
| 2765 | return 0; |
| 2766 | } |
| 2767 | |
Steven Rostedt | 28d20e2 | 2009-04-20 12:12:44 -0400 | [diff] [blame] | 2768 | late_initcall(event_trace_self_tests_init); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2769 | |
| 2770 | #endif |