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 | |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 11 | #include <linux/workqueue.h> |
| 12 | #include <linux/spinlock.h> |
| 13 | #include <linux/kthread.h> |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 14 | #include <linux/debugfs.h> |
| 15 | #include <linux/uaccess.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/ctype.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 18 | #include <linux/slab.h> |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 19 | #include <linux/delay.h> |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 20 | |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 21 | #include <asm/setup.h> |
| 22 | |
Steven Rostedt | 91729ef | 2009-03-02 15:03:01 -0500 | [diff] [blame] | 23 | #include "trace_output.h" |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 24 | |
Steven Rostedt | 4e5292e | 2009-09-12 19:26:21 -0400 | [diff] [blame] | 25 | #undef TRACE_SYSTEM |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 26 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
| 27 | |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 28 | DEFINE_MUTEX(event_mutex); |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 29 | |
Steven Rostedt | 0429578 | 2010-11-12 22:32:11 -0500 | [diff] [blame] | 30 | DEFINE_MUTEX(event_storage_mutex); |
| 31 | EXPORT_SYMBOL_GPL(event_storage_mutex); |
| 32 | |
| 33 | char event_storage[EVENT_STORAGE_SIZE]; |
| 34 | EXPORT_SYMBOL_GPL(event_storage); |
| 35 | |
Steven Rostedt | a59fd60 | 2009-04-10 13:52:20 -0400 | [diff] [blame] | 36 | LIST_HEAD(ftrace_events); |
zhangwei(Jovi) | b3a8c6f | 2013-03-11 15:13:42 +0800 | [diff] [blame] | 37 | static LIST_HEAD(ftrace_common_fields); |
Steven Rostedt | a59fd60 | 2009-04-10 13:52:20 -0400 | [diff] [blame] | 38 | |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 39 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
| 40 | |
| 41 | static struct kmem_cache *field_cachep; |
| 42 | static struct kmem_cache *file_cachep; |
| 43 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 44 | /* Double loops, do not use break, only goto's work */ |
| 45 | #define do_for_each_event_file(tr, file) \ |
| 46 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ |
| 47 | list_for_each_entry(file, &tr->events, list) |
| 48 | |
| 49 | #define do_for_each_event_file_safe(tr, file) \ |
| 50 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ |
| 51 | struct ftrace_event_file *___n; \ |
| 52 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
| 53 | |
| 54 | #define while_for_each_event_file() \ |
| 55 | } |
| 56 | |
zhangwei(Jovi) | b3a8c6f | 2013-03-11 15:13:42 +0800 | [diff] [blame] | 57 | static struct list_head * |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 58 | trace_get_fields(struct ftrace_event_call *event_call) |
| 59 | { |
| 60 | if (!event_call->class->get_fields) |
| 61 | return &event_call->class->fields; |
| 62 | return event_call->class->get_fields(event_call); |
| 63 | } |
| 64 | |
zhangwei(Jovi) | b3a8c6f | 2013-03-11 15:13:42 +0800 | [diff] [blame] | 65 | static struct ftrace_event_field * |
| 66 | __find_event_field(struct list_head *head, char *name) |
| 67 | { |
| 68 | struct ftrace_event_field *field; |
| 69 | |
| 70 | list_for_each_entry(field, head, link) { |
| 71 | if (!strcmp(field->name, name)) |
| 72 | return field; |
| 73 | } |
| 74 | |
| 75 | return NULL; |
| 76 | } |
| 77 | |
| 78 | struct ftrace_event_field * |
| 79 | trace_find_event_field(struct ftrace_event_call *call, char *name) |
| 80 | { |
| 81 | struct ftrace_event_field *field; |
| 82 | struct list_head *head; |
| 83 | |
| 84 | field = __find_event_field(&ftrace_common_fields, name); |
| 85 | if (field) |
| 86 | return field; |
| 87 | |
| 88 | head = trace_get_fields(call); |
| 89 | return __find_event_field(head, name); |
| 90 | } |
| 91 | |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 92 | static int __trace_define_field(struct list_head *head, const char *type, |
| 93 | const char *name, int offset, int size, |
| 94 | int is_signed, int filter_type) |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 95 | { |
| 96 | struct ftrace_event_field *field; |
| 97 | |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 98 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 99 | if (!field) |
Namhyung Kim | aaf6ac0 | 2013-06-07 15:07:48 +0900 | [diff] [blame^] | 100 | return -ENOMEM; |
Ingo Molnar | fe9f57f | 2009-03-22 18:41:59 +0100 | [diff] [blame] | 101 | |
Steven Rostedt | 92edca0 | 2013-02-27 20:41:37 -0500 | [diff] [blame] | 102 | field->name = name; |
| 103 | field->type = type; |
Ingo Molnar | fe9f57f | 2009-03-22 18:41:59 +0100 | [diff] [blame] | 104 | |
Li Zefan | 43b51ea | 2009-08-07 10:33:22 +0800 | [diff] [blame] | 105 | if (filter_type == FILTER_OTHER) |
| 106 | field->filter_type = filter_assign_type(type); |
| 107 | else |
| 108 | field->filter_type = filter_type; |
| 109 | |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 110 | field->offset = offset; |
| 111 | field->size = size; |
Tom Zanussi | a118e4d | 2009-04-28 03:04:53 -0500 | [diff] [blame] | 112 | field->is_signed = is_signed; |
Li Zefan | aa38e9f | 2009-08-07 10:33:02 +0800 | [diff] [blame] | 113 | |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 114 | list_add(&field->link, head); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 115 | |
| 116 | return 0; |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 117 | } |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 118 | |
| 119 | int trace_define_field(struct ftrace_event_call *call, const char *type, |
| 120 | const char *name, int offset, int size, int is_signed, |
| 121 | int filter_type) |
| 122 | { |
| 123 | struct list_head *head; |
| 124 | |
| 125 | if (WARN_ON(!call->class)) |
| 126 | return 0; |
| 127 | |
| 128 | head = trace_get_fields(call); |
| 129 | return __trace_define_field(head, type, name, offset, size, |
| 130 | is_signed, filter_type); |
| 131 | } |
Steven Rostedt | 17c873e | 2009-04-10 18:12:50 -0400 | [diff] [blame] | 132 | EXPORT_SYMBOL_GPL(trace_define_field); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 133 | |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 134 | #define __common_field(type, item) \ |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 135 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
| 136 | "common_" #item, \ |
| 137 | offsetof(typeof(ent), item), \ |
| 138 | sizeof(ent.item), \ |
| 139 | is_signed_type(type), FILTER_OTHER); \ |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 140 | if (ret) \ |
| 141 | return ret; |
| 142 | |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 143 | static int trace_define_common_fields(void) |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 144 | { |
| 145 | int ret; |
| 146 | struct trace_entry ent; |
| 147 | |
| 148 | __common_field(unsigned short, type); |
| 149 | __common_field(unsigned char, flags); |
| 150 | __common_field(unsigned char, preempt_count); |
| 151 | __common_field(int, pid); |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 152 | |
| 153 | return ret; |
| 154 | } |
| 155 | |
zhangwei(Jovi) | ad7067c | 2013-03-11 15:13:46 +0800 | [diff] [blame] | 156 | static void trace_destroy_fields(struct ftrace_event_call *call) |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 157 | { |
| 158 | struct ftrace_event_field *field, *next; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 159 | struct list_head *head; |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 160 | |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 161 | head = trace_get_fields(call); |
| 162 | list_for_each_entry_safe(field, next, head, link) { |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 163 | list_del(&field->link); |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 164 | kmem_cache_free(field_cachep, field); |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 165 | } |
| 166 | } |
| 167 | |
Li Zefan | 87d9b4e | 2009-12-08 11:14:20 +0800 | [diff] [blame] | 168 | int trace_event_raw_init(struct ftrace_event_call *call) |
| 169 | { |
| 170 | int id; |
| 171 | |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 172 | id = register_ftrace_event(&call->event); |
Li Zefan | 87d9b4e | 2009-12-08 11:14:20 +0800 | [diff] [blame] | 173 | if (!id) |
| 174 | return -ENODEV; |
Li Zefan | 87d9b4e | 2009-12-08 11:14:20 +0800 | [diff] [blame] | 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | EXPORT_SYMBOL_GPL(trace_event_raw_init); |
| 179 | |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 180 | int ftrace_event_reg(struct ftrace_event_call *call, |
| 181 | enum trace_reg type, void *data) |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 182 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 183 | struct ftrace_event_file *file = data; |
| 184 | |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 185 | switch (type) { |
| 186 | case TRACE_REG_REGISTER: |
| 187 | return tracepoint_probe_register(call->name, |
| 188 | call->class->probe, |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 189 | file); |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 190 | case TRACE_REG_UNREGISTER: |
| 191 | tracepoint_probe_unregister(call->name, |
| 192 | call->class->probe, |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 193 | file); |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 194 | return 0; |
| 195 | |
| 196 | #ifdef CONFIG_PERF_EVENTS |
| 197 | case TRACE_REG_PERF_REGISTER: |
| 198 | return tracepoint_probe_register(call->name, |
| 199 | call->class->perf_probe, |
| 200 | call); |
| 201 | case TRACE_REG_PERF_UNREGISTER: |
| 202 | tracepoint_probe_unregister(call->name, |
| 203 | call->class->perf_probe, |
| 204 | call); |
| 205 | return 0; |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 206 | case TRACE_REG_PERF_OPEN: |
| 207 | case TRACE_REG_PERF_CLOSE: |
Jiri Olsa | 489c75c | 2012-02-15 15:51:50 +0100 | [diff] [blame] | 208 | case TRACE_REG_PERF_ADD: |
| 209 | case TRACE_REG_PERF_DEL: |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 210 | return 0; |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 211 | #endif |
| 212 | } |
| 213 | return 0; |
| 214 | } |
| 215 | EXPORT_SYMBOL_GPL(ftrace_event_reg); |
| 216 | |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 217 | void trace_event_enable_cmd_record(bool enable) |
| 218 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 219 | struct ftrace_event_file *file; |
| 220 | struct trace_array *tr; |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 221 | |
| 222 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 223 | do_for_each_event_file(tr, file) { |
| 224 | |
| 225 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 226 | continue; |
| 227 | |
| 228 | if (enable) { |
| 229 | tracing_start_cmdline_record(); |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 230 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 231 | } else { |
| 232 | tracing_stop_cmdline_record(); |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 233 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 234 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 235 | } while_for_each_event_file(); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 236 | mutex_unlock(&event_mutex); |
| 237 | } |
| 238 | |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 239 | static int __ftrace_event_enable_disable(struct ftrace_event_file *file, |
| 240 | int enable, int soft_disable) |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 241 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 242 | struct ftrace_event_call *call = file->event_call; |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 243 | int ret = 0; |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 244 | int disable; |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 245 | |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 246 | switch (enable) { |
| 247 | case 0: |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 248 | /* |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 249 | * When soft_disable is set and enable is cleared, the sm_ref |
| 250 | * reference counter is decremented. If it reaches 0, we want |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 251 | * to clear the SOFT_DISABLED flag but leave the event in the |
| 252 | * state that it was. That is, if the event was enabled and |
| 253 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED |
| 254 | * is set we do not want the event to be enabled before we |
| 255 | * clear the bit. |
| 256 | * |
| 257 | * When soft_disable is not set but the SOFT_MODE flag is, |
| 258 | * we do nothing. Do not disable the tracepoint, otherwise |
| 259 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. |
| 260 | */ |
| 261 | if (soft_disable) { |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 262 | if (atomic_dec_return(&file->sm_ref) > 0) |
| 263 | break; |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 264 | disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED; |
| 265 | clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); |
| 266 | } else |
| 267 | disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE); |
| 268 | |
| 269 | if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) { |
| 270 | clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 271 | if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 272 | tracing_stop_cmdline_record(); |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 273 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 274 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 275 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 276 | } |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 277 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT */ |
| 278 | if (file->flags & FTRACE_EVENT_FL_SOFT_MODE) |
| 279 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 280 | break; |
| 281 | case 1: |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 282 | /* |
| 283 | * When soft_disable is set and enable is set, we want to |
| 284 | * register the tracepoint for the event, but leave the event |
| 285 | * as is. That means, if the event was already enabled, we do |
| 286 | * nothing (but set SOFT_MODE). If the event is disabled, we |
| 287 | * set SOFT_DISABLED before enabling the event tracepoint, so |
| 288 | * it still seems to be disabled. |
| 289 | */ |
| 290 | if (!soft_disable) |
| 291 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 292 | else { |
| 293 | if (atomic_inc_return(&file->sm_ref) > 1) |
| 294 | break; |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 295 | set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 296 | } |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 297 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 298 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 299 | |
| 300 | /* Keep the event disabled, when going to SOFT_MODE. */ |
| 301 | if (soft_disable) |
| 302 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); |
| 303 | |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 304 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
| 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 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 308 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 309 | if (ret) { |
| 310 | tracing_stop_cmdline_record(); |
| 311 | pr_info("event trace: Could not enable event " |
| 312 | "%s\n", call->name); |
| 313 | break; |
| 314 | } |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 315 | set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 316 | |
| 317 | /* WAS_ENABLED gets set but never cleared. */ |
| 318 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 319 | } |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 320 | break; |
| 321 | } |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 322 | |
| 323 | return ret; |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 324 | } |
| 325 | |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 326 | static int ftrace_event_enable_disable(struct ftrace_event_file *file, |
| 327 | int enable) |
| 328 | { |
| 329 | return __ftrace_event_enable_disable(file, enable, 0); |
| 330 | } |
| 331 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 332 | static void ftrace_clear_events(struct trace_array *tr) |
Zhaolei | 0e907c9 | 2009-05-25 18:13:59 +0800 | [diff] [blame] | 333 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 334 | struct ftrace_event_file *file; |
Zhaolei | 0e907c9 | 2009-05-25 18:13:59 +0800 | [diff] [blame] | 335 | |
| 336 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 337 | list_for_each_entry(file, &tr->events, list) { |
| 338 | ftrace_event_enable_disable(file, 0); |
Zhaolei | 0e907c9 | 2009-05-25 18:13:59 +0800 | [diff] [blame] | 339 | } |
| 340 | mutex_unlock(&event_mutex); |
| 341 | } |
| 342 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 343 | static void __put_system(struct event_subsystem *system) |
| 344 | { |
| 345 | struct event_filter *filter = system->filter; |
| 346 | |
| 347 | WARN_ON_ONCE(system->ref_count == 0); |
| 348 | if (--system->ref_count) |
| 349 | return; |
| 350 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 351 | list_del(&system->list); |
| 352 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 353 | if (filter) { |
| 354 | kfree(filter->filter_string); |
| 355 | kfree(filter); |
| 356 | } |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 357 | kfree(system); |
| 358 | } |
| 359 | |
| 360 | static void __get_system(struct event_subsystem *system) |
| 361 | { |
| 362 | WARN_ON_ONCE(system->ref_count == 0); |
| 363 | system->ref_count++; |
| 364 | } |
| 365 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 366 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
| 367 | { |
| 368 | WARN_ON_ONCE(dir->ref_count == 0); |
| 369 | dir->ref_count++; |
| 370 | __get_system(dir->subsystem); |
| 371 | } |
| 372 | |
| 373 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) |
| 374 | { |
| 375 | WARN_ON_ONCE(dir->ref_count == 0); |
| 376 | /* If the subsystem is about to be freed, the dir must be too */ |
| 377 | WARN_ON_ONCE(dir->subsystem->ref_count == 1 && dir->ref_count != 1); |
| 378 | |
| 379 | __put_system(dir->subsystem); |
| 380 | if (!--dir->ref_count) |
| 381 | kfree(dir); |
| 382 | } |
| 383 | |
| 384 | static void put_system(struct ftrace_subsystem_dir *dir) |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 385 | { |
| 386 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 387 | __put_system_dir(dir); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 388 | mutex_unlock(&event_mutex); |
| 389 | } |
| 390 | |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 391 | /* |
| 392 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. |
| 393 | */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 394 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, |
| 395 | const char *sub, const char *event, int set) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 396 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 397 | struct ftrace_event_file *file; |
Steven Rostedt | a59fd60 | 2009-04-10 13:52:20 -0400 | [diff] [blame] | 398 | struct ftrace_event_call *call; |
Steven Rostedt | 29f9394 | 2009-05-08 16:06:47 -0400 | [diff] [blame] | 399 | int ret = -EINVAL; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 400 | |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 401 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 402 | list_for_each_entry(file, &tr->events, list) { |
| 403 | |
| 404 | call = file->event_call; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 405 | |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 406 | if (!call->name || !call->class || !call->class->reg) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 407 | continue; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 408 | |
Steven Rostedt | 9b63776 | 2012-05-10 15:55:43 -0400 | [diff] [blame] | 409 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
| 410 | continue; |
| 411 | |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 412 | if (match && |
| 413 | strcmp(match, call->name) != 0 && |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 414 | strcmp(match, call->class->system) != 0) |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 415 | continue; |
| 416 | |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 417 | if (sub && strcmp(sub, call->class->system) != 0) |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 418 | continue; |
| 419 | |
| 420 | if (event && strcmp(event, call->name) != 0) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 421 | continue; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 422 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 423 | ftrace_event_enable_disable(file, set); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 424 | |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 425 | ret = 0; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 426 | } |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 427 | mutex_unlock(&event_mutex); |
| 428 | |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 429 | return ret; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 430 | } |
| 431 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 432 | 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] | 433 | { |
| 434 | char *event = NULL, *sub = NULL, *match; |
| 435 | |
| 436 | /* |
| 437 | * The buf format can be <subsystem>:<event-name> |
| 438 | * *:<event-name> means any event by that name. |
| 439 | * :<event-name> is the same. |
| 440 | * |
| 441 | * <subsystem>:* means all events in that subsystem |
| 442 | * <subsystem>: means the same. |
| 443 | * |
| 444 | * <name> (no ':') means all events in a subsystem with |
| 445 | * the name <name> or any event that matches <name> |
| 446 | */ |
| 447 | |
| 448 | match = strsep(&buf, ":"); |
| 449 | if (buf) { |
| 450 | sub = match; |
| 451 | event = buf; |
| 452 | match = NULL; |
| 453 | |
| 454 | if (!strlen(sub) || strcmp(sub, "*") == 0) |
| 455 | sub = NULL; |
| 456 | if (!strlen(event) || strcmp(event, "*") == 0) |
| 457 | event = NULL; |
| 458 | } |
| 459 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 460 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 461 | } |
| 462 | |
Steven Rostedt | 4671c79 | 2009-05-08 16:27:41 -0400 | [diff] [blame] | 463 | /** |
| 464 | * trace_set_clr_event - enable or disable an event |
| 465 | * @system: system name to match (NULL for any system) |
| 466 | * @event: event name to match (NULL for all events, within system) |
| 467 | * @set: 1 to enable, 0 to disable |
| 468 | * |
| 469 | * This is a way for other parts of the kernel to enable or disable |
| 470 | * event recording. |
| 471 | * |
| 472 | * Returns 0 on success, -EINVAL if the parameters do not match any |
| 473 | * registered events. |
| 474 | */ |
| 475 | int trace_set_clr_event(const char *system, const char *event, int set) |
| 476 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 477 | struct trace_array *tr = top_trace_array(); |
| 478 | |
| 479 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
Steven Rostedt | 4671c79 | 2009-05-08 16:27:41 -0400 | [diff] [blame] | 480 | } |
Yuanhan Liu | 56355b8 | 2010-11-08 14:05:12 +0800 | [diff] [blame] | 481 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
Steven Rostedt | 4671c79 | 2009-05-08 16:27:41 -0400 | [diff] [blame] | 482 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 483 | /* 128 should be much more than enough */ |
| 484 | #define EVENT_BUF_SIZE 127 |
| 485 | |
| 486 | static ssize_t |
| 487 | ftrace_event_write(struct file *file, const char __user *ubuf, |
| 488 | size_t cnt, loff_t *ppos) |
| 489 | { |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 490 | struct trace_parser parser; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 491 | struct seq_file *m = file->private_data; |
| 492 | struct trace_array *tr = m->private; |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 493 | ssize_t read, ret; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 494 | |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 495 | if (!cnt) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 496 | return 0; |
| 497 | |
Steven Rostedt | 1852fcc | 2009-03-11 14:33:00 -0400 | [diff] [blame] | 498 | ret = tracing_update_buffers(); |
| 499 | if (ret < 0) |
| 500 | return ret; |
| 501 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 502 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 503 | return -ENOMEM; |
| 504 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 505 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 506 | |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 507 | if (read >= 0 && trace_parser_loaded((&parser))) { |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 508 | int set = 1; |
| 509 | |
| 510 | if (*parser.buffer == '!') |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 511 | set = 0; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 512 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 513 | parser.buffer[parser.idx] = 0; |
| 514 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 515 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 516 | if (ret) |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 517 | goto out_put; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 518 | } |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 519 | |
| 520 | ret = read; |
| 521 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 522 | out_put: |
| 523 | trace_parser_put(&parser); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 524 | |
| 525 | return ret; |
| 526 | } |
| 527 | |
| 528 | static void * |
| 529 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 530 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 531 | struct ftrace_event_file *file = v; |
| 532 | struct ftrace_event_call *call; |
| 533 | struct trace_array *tr = m->private; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 534 | |
| 535 | (*pos)++; |
| 536 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 537 | list_for_each_entry_continue(file, &tr->events, list) { |
| 538 | call = file->event_call; |
Steven Rostedt | 40e2681 | 2009-03-10 11:32:40 -0400 | [diff] [blame] | 539 | /* |
| 540 | * The ftrace subsystem is for showing formats only. |
| 541 | * They can not be enabled or disabled via the event files. |
| 542 | */ |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 543 | if (call->class && call->class->reg) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 544 | return file; |
Steven Rostedt | 40e2681 | 2009-03-10 11:32:40 -0400 | [diff] [blame] | 545 | } |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 546 | |
Li Zefan | 30bd39c | 2009-09-18 14:07:05 +0800 | [diff] [blame] | 547 | return NULL; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 548 | } |
| 549 | |
| 550 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 551 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 552 | struct ftrace_event_file *file; |
| 553 | struct trace_array *tr = m->private; |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 554 | loff_t l; |
| 555 | |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 556 | mutex_lock(&event_mutex); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 557 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 558 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 559 | for (l = 0; l <= *pos; ) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 560 | file = t_next(m, file, &l); |
| 561 | if (!file) |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 562 | break; |
| 563 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 564 | return file; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 565 | } |
| 566 | |
| 567 | static void * |
| 568 | s_next(struct seq_file *m, void *v, loff_t *pos) |
| 569 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 570 | struct ftrace_event_file *file = v; |
| 571 | struct trace_array *tr = m->private; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 572 | |
| 573 | (*pos)++; |
| 574 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 575 | list_for_each_entry_continue(file, &tr->events, list) { |
| 576 | if (file->flags & FTRACE_EVENT_FL_ENABLED) |
| 577 | return file; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 578 | } |
| 579 | |
Li Zefan | 30bd39c | 2009-09-18 14:07:05 +0800 | [diff] [blame] | 580 | return NULL; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 581 | } |
| 582 | |
| 583 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 584 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 585 | struct ftrace_event_file *file; |
| 586 | struct trace_array *tr = m->private; |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 587 | loff_t l; |
| 588 | |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 589 | mutex_lock(&event_mutex); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 590 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 591 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 592 | for (l = 0; l <= *pos; ) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 593 | file = s_next(m, file, &l); |
| 594 | if (!file) |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 595 | break; |
| 596 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 597 | return file; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 598 | } |
| 599 | |
| 600 | static int t_show(struct seq_file *m, void *v) |
| 601 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 602 | struct ftrace_event_file *file = v; |
| 603 | struct ftrace_event_call *call = file->event_call; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 604 | |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 605 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
| 606 | seq_printf(m, "%s:", call->class->system); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 607 | seq_printf(m, "%s\n", call->name); |
| 608 | |
| 609 | return 0; |
| 610 | } |
| 611 | |
| 612 | static void t_stop(struct seq_file *m, void *p) |
| 613 | { |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 614 | mutex_unlock(&event_mutex); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 615 | } |
| 616 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 617 | static ssize_t |
| 618 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 619 | loff_t *ppos) |
| 620 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 621 | struct ftrace_event_file *file = filp->private_data; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 622 | char *buf; |
| 623 | |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 624 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
| 625 | if (file->flags & FTRACE_EVENT_FL_SOFT_DISABLED) |
| 626 | buf = "0*\n"; |
Masami Hiramatsu | 3005217 | 2013-05-09 14:44:26 +0900 | [diff] [blame] | 627 | else if (file->flags & FTRACE_EVENT_FL_SOFT_MODE) |
| 628 | buf = "1*\n"; |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 629 | else |
| 630 | buf = "1\n"; |
| 631 | } else |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 632 | buf = "0\n"; |
| 633 | |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 634 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 635 | } |
| 636 | |
| 637 | static ssize_t |
| 638 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 639 | loff_t *ppos) |
| 640 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 641 | struct ftrace_event_file *file = filp->private_data; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 642 | unsigned long val; |
| 643 | int ret; |
| 644 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 645 | if (!file) |
| 646 | return -EINVAL; |
| 647 | |
Peter Huewe | 22fe9b5 | 2011-06-07 21:58:27 +0200 | [diff] [blame] | 648 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
| 649 | if (ret) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 650 | return ret; |
| 651 | |
Steven Rostedt | 1852fcc | 2009-03-11 14:33:00 -0400 | [diff] [blame] | 652 | ret = tracing_update_buffers(); |
| 653 | if (ret < 0) |
| 654 | return ret; |
| 655 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 656 | switch (val) { |
| 657 | case 0: |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 658 | case 1: |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 659 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 660 | ret = ftrace_event_enable_disable(file, val); |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 661 | mutex_unlock(&event_mutex); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 662 | break; |
| 663 | |
| 664 | default: |
| 665 | return -EINVAL; |
| 666 | } |
| 667 | |
| 668 | *ppos += cnt; |
| 669 | |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 670 | return ret ? ret : cnt; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 671 | } |
| 672 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 673 | static ssize_t |
| 674 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 675 | loff_t *ppos) |
| 676 | { |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 677 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 678 | struct ftrace_subsystem_dir *dir = filp->private_data; |
| 679 | struct event_subsystem *system = dir->subsystem; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 680 | struct ftrace_event_call *call; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 681 | struct ftrace_event_file *file; |
| 682 | struct trace_array *tr = dir->tr; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 683 | char buf[2]; |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 684 | int set = 0; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 685 | int ret; |
| 686 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 687 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 688 | list_for_each_entry(file, &tr->events, list) { |
| 689 | call = file->event_call; |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 690 | if (!call->name || !call->class || !call->class->reg) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 691 | continue; |
| 692 | |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 693 | if (system && strcmp(call->class->system, system->name) != 0) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 694 | continue; |
| 695 | |
| 696 | /* |
| 697 | * We need to find out if all the events are set |
| 698 | * or if all events or cleared, or if we have |
| 699 | * a mixture. |
| 700 | */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 701 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 702 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 703 | /* |
| 704 | * If we have a mixture, no need to look further. |
| 705 | */ |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 706 | if (set == 3) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 707 | break; |
| 708 | } |
| 709 | mutex_unlock(&event_mutex); |
| 710 | |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 711 | buf[0] = set_to_char[set]; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 712 | buf[1] = '\n'; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 713 | |
| 714 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); |
| 715 | |
| 716 | return ret; |
| 717 | } |
| 718 | |
| 719 | static ssize_t |
| 720 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 721 | loff_t *ppos) |
| 722 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 723 | struct ftrace_subsystem_dir *dir = filp->private_data; |
| 724 | struct event_subsystem *system = dir->subsystem; |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 725 | const char *name = NULL; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 726 | unsigned long val; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 727 | ssize_t ret; |
| 728 | |
Peter Huewe | 22fe9b5 | 2011-06-07 21:58:27 +0200 | [diff] [blame] | 729 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
| 730 | if (ret) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 731 | return ret; |
| 732 | |
| 733 | ret = tracing_update_buffers(); |
| 734 | if (ret < 0) |
| 735 | return ret; |
| 736 | |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 737 | if (val != 0 && val != 1) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 738 | return -EINVAL; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 739 | |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 740 | /* |
| 741 | * Opening of "enable" adds a ref count to system, |
| 742 | * so the name is safe to use. |
| 743 | */ |
| 744 | if (system) |
| 745 | name = system->name; |
| 746 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 747 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 748 | if (ret) |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 749 | goto out; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 750 | |
| 751 | ret = cnt; |
| 752 | |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 753 | out: |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 754 | *ppos += cnt; |
| 755 | |
| 756 | return ret; |
| 757 | } |
| 758 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 759 | enum { |
| 760 | FORMAT_HEADER = 1, |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 761 | FORMAT_FIELD_SEPERATOR = 2, |
| 762 | FORMAT_PRINTFMT = 3, |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 763 | }; |
| 764 | |
| 765 | 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] | 766 | { |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 767 | struct ftrace_event_call *call = m->private; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 768 | struct ftrace_event_field *field; |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 769 | struct list_head *common_head = &ftrace_common_fields; |
| 770 | struct list_head *head = trace_get_fields(call); |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 771 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 772 | (*pos)++; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 773 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 774 | switch ((unsigned long)v) { |
| 775 | case FORMAT_HEADER: |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 776 | if (unlikely(list_empty(common_head))) |
| 777 | return NULL; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 778 | |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 779 | field = list_entry(common_head->prev, |
| 780 | struct ftrace_event_field, link); |
| 781 | return field; |
| 782 | |
| 783 | case FORMAT_FIELD_SEPERATOR: |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 784 | if (unlikely(list_empty(head))) |
| 785 | return NULL; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 786 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 787 | field = list_entry(head->prev, struct ftrace_event_field, link); |
| 788 | return field; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 789 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 790 | case FORMAT_PRINTFMT: |
| 791 | /* all done */ |
| 792 | return NULL; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 793 | } |
| 794 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 795 | field = v; |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 796 | if (field->link.prev == common_head) |
| 797 | return (void *)FORMAT_FIELD_SEPERATOR; |
| 798 | else if (field->link.prev == head) |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 799 | return (void *)FORMAT_PRINTFMT; |
| 800 | |
| 801 | field = list_entry(field->link.prev, struct ftrace_event_field, link); |
| 802 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 803 | return field; |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 804 | } |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 805 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 806 | static void *f_start(struct seq_file *m, loff_t *pos) |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 807 | { |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 808 | loff_t l = 0; |
| 809 | void *p; |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 810 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 811 | /* Start by showing the header */ |
| 812 | if (!*pos) |
| 813 | return (void *)FORMAT_HEADER; |
| 814 | |
| 815 | p = (void *)FORMAT_HEADER; |
| 816 | do { |
| 817 | p = f_next(m, p, &l); |
| 818 | } while (p && l < *pos); |
| 819 | |
| 820 | return p; |
| 821 | } |
| 822 | |
| 823 | static int f_show(struct seq_file *m, void *v) |
| 824 | { |
| 825 | struct ftrace_event_call *call = m->private; |
| 826 | struct ftrace_event_field *field; |
| 827 | const char *array_descriptor; |
| 828 | |
| 829 | switch ((unsigned long)v) { |
| 830 | case FORMAT_HEADER: |
| 831 | seq_printf(m, "name: %s\n", call->name); |
| 832 | seq_printf(m, "ID: %d\n", call->event.type); |
| 833 | seq_printf(m, "format:\n"); |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 834 | return 0; |
| 835 | |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 836 | case FORMAT_FIELD_SEPERATOR: |
| 837 | seq_putc(m, '\n'); |
| 838 | return 0; |
| 839 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 840 | case FORMAT_PRINTFMT: |
| 841 | seq_printf(m, "\nprint fmt: %s\n", |
| 842 | call->print_fmt); |
| 843 | return 0; |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 844 | } |
| 845 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 846 | field = v; |
| 847 | |
| 848 | /* |
| 849 | * Smartly shows the array type(except dynamic array). |
| 850 | * Normal: |
| 851 | * field:TYPE VAR |
| 852 | * If TYPE := TYPE[LEN], it is shown: |
| 853 | * field:TYPE VAR[LEN] |
| 854 | */ |
| 855 | array_descriptor = strchr(field->type, '['); |
| 856 | |
| 857 | if (!strncmp(field->type, "__data_loc", 10)) |
| 858 | array_descriptor = NULL; |
| 859 | |
| 860 | if (!array_descriptor) |
| 861 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", |
| 862 | field->type, field->name, field->offset, |
| 863 | field->size, !!field->is_signed); |
| 864 | else |
| 865 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", |
| 866 | (int)(array_descriptor - field->type), |
| 867 | field->type, field->name, |
| 868 | array_descriptor, field->offset, |
| 869 | field->size, !!field->is_signed); |
| 870 | |
| 871 | return 0; |
| 872 | } |
| 873 | |
| 874 | static void f_stop(struct seq_file *m, void *p) |
| 875 | { |
| 876 | } |
| 877 | |
| 878 | static const struct seq_operations trace_format_seq_ops = { |
| 879 | .start = f_start, |
| 880 | .next = f_next, |
| 881 | .stop = f_stop, |
| 882 | .show = f_show, |
| 883 | }; |
| 884 | |
| 885 | static int trace_format_open(struct inode *inode, struct file *file) |
| 886 | { |
| 887 | struct ftrace_event_call *call = inode->i_private; |
| 888 | struct seq_file *m; |
| 889 | int ret; |
| 890 | |
| 891 | ret = seq_open(file, &trace_format_seq_ops); |
| 892 | if (ret < 0) |
| 893 | return ret; |
| 894 | |
| 895 | m = file->private_data; |
| 896 | m->private = call; |
| 897 | |
| 898 | return 0; |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 899 | } |
| 900 | |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 901 | static ssize_t |
| 902 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) |
| 903 | { |
| 904 | struct ftrace_event_call *call = filp->private_data; |
| 905 | struct trace_seq *s; |
| 906 | int r; |
| 907 | |
| 908 | if (*ppos) |
| 909 | return 0; |
| 910 | |
| 911 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 912 | if (!s) |
| 913 | return -ENOMEM; |
| 914 | |
| 915 | trace_seq_init(s); |
Steven Rostedt | 32c0eda | 2010-04-23 10:38:03 -0400 | [diff] [blame] | 916 | trace_seq_printf(s, "%d\n", call->event.type); |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 917 | |
| 918 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
| 919 | s->buffer, s->len); |
| 920 | kfree(s); |
| 921 | return r; |
| 922 | } |
| 923 | |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 924 | static ssize_t |
| 925 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 926 | loff_t *ppos) |
| 927 | { |
| 928 | struct ftrace_event_call *call = filp->private_data; |
| 929 | struct trace_seq *s; |
| 930 | int r; |
| 931 | |
| 932 | if (*ppos) |
| 933 | return 0; |
| 934 | |
| 935 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 936 | if (!s) |
| 937 | return -ENOMEM; |
| 938 | |
| 939 | trace_seq_init(s); |
| 940 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 941 | print_event_filter(call, s); |
Tom Zanussi | 4bda2d5 | 2009-03-24 02:14:31 -0500 | [diff] [blame] | 942 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 943 | |
| 944 | kfree(s); |
| 945 | |
| 946 | return r; |
| 947 | } |
| 948 | |
| 949 | static ssize_t |
| 950 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 951 | loff_t *ppos) |
| 952 | { |
| 953 | struct ftrace_event_call *call = filp->private_data; |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 954 | char *buf; |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 955 | int err; |
| 956 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 957 | if (cnt >= PAGE_SIZE) |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 958 | return -EINVAL; |
| 959 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 960 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
| 961 | if (!buf) |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 962 | return -ENOMEM; |
| 963 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 964 | if (copy_from_user(buf, ubuf, cnt)) { |
| 965 | free_page((unsigned long) buf); |
| 966 | return -EFAULT; |
| 967 | } |
| 968 | buf[cnt] = '\0'; |
| 969 | |
| 970 | err = apply_event_filter(call, buf); |
| 971 | free_page((unsigned long) buf); |
| 972 | if (err < 0) |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 973 | return err; |
Tom Zanussi | 0a19e53 | 2009-04-13 03:17:50 -0500 | [diff] [blame] | 974 | |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 975 | *ppos += cnt; |
| 976 | |
| 977 | return cnt; |
| 978 | } |
| 979 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 980 | static LIST_HEAD(event_subsystems); |
| 981 | |
| 982 | static int subsystem_open(struct inode *inode, struct file *filp) |
| 983 | { |
| 984 | struct event_subsystem *system = NULL; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 985 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
| 986 | struct trace_array *tr; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 987 | int ret; |
| 988 | |
| 989 | /* Make sure the system still exists */ |
| 990 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 991 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
| 992 | list_for_each_entry(dir, &tr->systems, list) { |
| 993 | if (dir == inode->i_private) { |
| 994 | /* Don't open systems with no events */ |
| 995 | if (dir->nr_events) { |
| 996 | __get_system_dir(dir); |
| 997 | system = dir->subsystem; |
| 998 | } |
| 999 | goto exit_loop; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1000 | } |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1001 | } |
| 1002 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1003 | exit_loop: |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1004 | mutex_unlock(&event_mutex); |
| 1005 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1006 | if (!system) |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1007 | return -ENODEV; |
| 1008 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1009 | /* Some versions of gcc think dir can be uninitialized here */ |
| 1010 | WARN_ON(!dir); |
| 1011 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1012 | ret = tracing_open_generic(inode, filp); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1013 | if (ret < 0) |
| 1014 | put_system(dir); |
| 1015 | |
| 1016 | return ret; |
| 1017 | } |
| 1018 | |
| 1019 | static int system_tr_open(struct inode *inode, struct file *filp) |
| 1020 | { |
| 1021 | struct ftrace_subsystem_dir *dir; |
| 1022 | struct trace_array *tr = inode->i_private; |
| 1023 | int ret; |
| 1024 | |
| 1025 | /* Make a temporary dir that has no system but points to tr */ |
| 1026 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
| 1027 | if (!dir) |
| 1028 | return -ENOMEM; |
| 1029 | |
| 1030 | dir->tr = tr; |
| 1031 | |
| 1032 | ret = tracing_open_generic(inode, filp); |
| 1033 | if (ret < 0) |
| 1034 | kfree(dir); |
| 1035 | |
| 1036 | filp->private_data = dir; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1037 | |
| 1038 | return ret; |
| 1039 | } |
| 1040 | |
| 1041 | static int subsystem_release(struct inode *inode, struct file *file) |
| 1042 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1043 | struct ftrace_subsystem_dir *dir = file->private_data; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1044 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1045 | /* |
| 1046 | * If dir->subsystem is NULL, then this is a temporary |
| 1047 | * descriptor that was made for a trace_array to enable |
| 1048 | * all subsystems. |
| 1049 | */ |
| 1050 | if (dir->subsystem) |
| 1051 | put_system(dir); |
| 1052 | else |
| 1053 | kfree(dir); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1054 | |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1058 | static ssize_t |
| 1059 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 1060 | loff_t *ppos) |
| 1061 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1062 | struct ftrace_subsystem_dir *dir = filp->private_data; |
| 1063 | struct event_subsystem *system = dir->subsystem; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1064 | struct trace_seq *s; |
| 1065 | int r; |
| 1066 | |
| 1067 | if (*ppos) |
| 1068 | return 0; |
| 1069 | |
| 1070 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 1071 | if (!s) |
| 1072 | return -ENOMEM; |
| 1073 | |
| 1074 | trace_seq_init(s); |
| 1075 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1076 | print_subsystem_event_filter(system, s); |
Tom Zanussi | 4bda2d5 | 2009-03-24 02:14:31 -0500 | [diff] [blame] | 1077 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1078 | |
| 1079 | kfree(s); |
| 1080 | |
| 1081 | return r; |
| 1082 | } |
| 1083 | |
| 1084 | static ssize_t |
| 1085 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 1086 | loff_t *ppos) |
| 1087 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1088 | struct ftrace_subsystem_dir *dir = filp->private_data; |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1089 | char *buf; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1090 | int err; |
| 1091 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1092 | if (cnt >= PAGE_SIZE) |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1093 | return -EINVAL; |
| 1094 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1095 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
| 1096 | if (!buf) |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1097 | return -ENOMEM; |
| 1098 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1099 | if (copy_from_user(buf, ubuf, cnt)) { |
| 1100 | free_page((unsigned long) buf); |
| 1101 | return -EFAULT; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1102 | } |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1103 | buf[cnt] = '\0'; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1104 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1105 | err = apply_subsystem_event_filter(dir, buf); |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1106 | free_page((unsigned long) buf); |
| 1107 | if (err < 0) |
Li Zefan | 44e9c8b | 2009-04-11 15:55:28 +0800 | [diff] [blame] | 1108 | return err; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1109 | |
| 1110 | *ppos += cnt; |
| 1111 | |
| 1112 | return cnt; |
| 1113 | } |
| 1114 | |
Steven Rostedt | d1b182a | 2009-04-15 16:53:47 -0400 | [diff] [blame] | 1115 | static ssize_t |
| 1116 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) |
| 1117 | { |
| 1118 | int (*func)(struct trace_seq *s) = filp->private_data; |
| 1119 | struct trace_seq *s; |
| 1120 | int r; |
| 1121 | |
| 1122 | if (*ppos) |
| 1123 | return 0; |
| 1124 | |
| 1125 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 1126 | if (!s) |
| 1127 | return -ENOMEM; |
| 1128 | |
| 1129 | trace_seq_init(s); |
| 1130 | |
| 1131 | func(s); |
| 1132 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
| 1133 | |
| 1134 | kfree(s); |
| 1135 | |
| 1136 | return r; |
| 1137 | } |
| 1138 | |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1139 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
| 1140 | static int ftrace_event_set_open(struct inode *inode, struct file *file); |
| 1141 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1142 | static const struct seq_operations show_event_seq_ops = { |
| 1143 | .start = t_start, |
| 1144 | .next = t_next, |
| 1145 | .show = t_show, |
| 1146 | .stop = t_stop, |
| 1147 | }; |
| 1148 | |
| 1149 | static const struct seq_operations show_set_event_seq_ops = { |
| 1150 | .start = s_start, |
| 1151 | .next = s_next, |
| 1152 | .show = t_show, |
| 1153 | .stop = t_stop, |
| 1154 | }; |
| 1155 | |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 1156 | static const struct file_operations ftrace_avail_fops = { |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1157 | .open = ftrace_event_avail_open, |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 1158 | .read = seq_read, |
| 1159 | .llseek = seq_lseek, |
| 1160 | .release = seq_release, |
| 1161 | }; |
| 1162 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1163 | static const struct file_operations ftrace_set_event_fops = { |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1164 | .open = ftrace_event_set_open, |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1165 | .read = seq_read, |
| 1166 | .write = ftrace_event_write, |
| 1167 | .llseek = seq_lseek, |
| 1168 | .release = seq_release, |
| 1169 | }; |
| 1170 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1171 | static const struct file_operations ftrace_enable_fops = { |
| 1172 | .open = tracing_open_generic, |
| 1173 | .read = event_enable_read, |
| 1174 | .write = event_enable_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1175 | .llseek = default_llseek, |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1176 | }; |
| 1177 | |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 1178 | static const struct file_operations ftrace_event_format_fops = { |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1179 | .open = trace_format_open, |
| 1180 | .read = seq_read, |
| 1181 | .llseek = seq_lseek, |
| 1182 | .release = seq_release, |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 1183 | }; |
| 1184 | |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1185 | static const struct file_operations ftrace_event_id_fops = { |
| 1186 | .open = tracing_open_generic, |
| 1187 | .read = event_id_read, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1188 | .llseek = default_llseek, |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1189 | }; |
| 1190 | |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1191 | static const struct file_operations ftrace_event_filter_fops = { |
| 1192 | .open = tracing_open_generic, |
| 1193 | .read = event_filter_read, |
| 1194 | .write = event_filter_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1195 | .llseek = default_llseek, |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1196 | }; |
| 1197 | |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1198 | static const struct file_operations ftrace_subsystem_filter_fops = { |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1199 | .open = subsystem_open, |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1200 | .read = subsystem_filter_read, |
| 1201 | .write = subsystem_filter_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1202 | .llseek = default_llseek, |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1203 | .release = subsystem_release, |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1204 | }; |
| 1205 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1206 | static const struct file_operations ftrace_system_enable_fops = { |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 1207 | .open = subsystem_open, |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1208 | .read = system_enable_read, |
| 1209 | .write = system_enable_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1210 | .llseek = default_llseek, |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 1211 | .release = subsystem_release, |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1212 | }; |
| 1213 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1214 | static const struct file_operations ftrace_tr_enable_fops = { |
| 1215 | .open = system_tr_open, |
| 1216 | .read = system_enable_read, |
| 1217 | .write = system_enable_write, |
| 1218 | .llseek = default_llseek, |
| 1219 | .release = subsystem_release, |
| 1220 | }; |
| 1221 | |
Steven Rostedt | d1b182a | 2009-04-15 16:53:47 -0400 | [diff] [blame] | 1222 | static const struct file_operations ftrace_show_header_fops = { |
| 1223 | .open = tracing_open_generic, |
| 1224 | .read = show_header, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1225 | .llseek = default_llseek, |
Steven Rostedt | d1b182a | 2009-04-15 16:53:47 -0400 | [diff] [blame] | 1226 | }; |
| 1227 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1228 | static int |
| 1229 | ftrace_event_open(struct inode *inode, struct file *file, |
| 1230 | const struct seq_operations *seq_ops) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1231 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1232 | struct seq_file *m; |
| 1233 | int ret; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1234 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1235 | ret = seq_open(file, seq_ops); |
| 1236 | if (ret < 0) |
| 1237 | return ret; |
| 1238 | m = file->private_data; |
| 1239 | /* copy tr over to seq ops */ |
| 1240 | m->private = inode->i_private; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1241 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1242 | return ret; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1243 | } |
| 1244 | |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1245 | static int |
| 1246 | ftrace_event_avail_open(struct inode *inode, struct file *file) |
| 1247 | { |
| 1248 | const struct seq_operations *seq_ops = &show_event_seq_ops; |
| 1249 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1250 | return ftrace_event_open(inode, file, seq_ops); |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1251 | } |
| 1252 | |
| 1253 | static int |
| 1254 | ftrace_event_set_open(struct inode *inode, struct file *file) |
| 1255 | { |
| 1256 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1257 | struct trace_array *tr = inode->i_private; |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1258 | |
| 1259 | if ((file->f_mode & FMODE_WRITE) && |
| 1260 | (file->f_flags & O_TRUNC)) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1261 | ftrace_clear_events(tr); |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1262 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1263 | return ftrace_event_open(inode, file, seq_ops); |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1264 | } |
| 1265 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1266 | static struct event_subsystem * |
| 1267 | create_new_subsystem(const char *name) |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1268 | { |
| 1269 | struct event_subsystem *system; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1270 | |
| 1271 | /* need to create new entry */ |
| 1272 | system = kmalloc(sizeof(*system), GFP_KERNEL); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1273 | if (!system) |
| 1274 | return NULL; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1275 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1276 | system->ref_count = 1; |
Steven Rostedt | 92edca0 | 2013-02-27 20:41:37 -0500 | [diff] [blame] | 1277 | system->name = name; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1278 | |
Tom Zanussi | 30e673b | 2009-04-28 03:04:47 -0500 | [diff] [blame] | 1279 | system->filter = NULL; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1280 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1281 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1282 | if (!system->filter) |
| 1283 | goto out_free; |
| 1284 | |
| 1285 | list_add(&system->list, &event_subsystems); |
| 1286 | |
| 1287 | return system; |
| 1288 | |
| 1289 | out_free: |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1290 | kfree(system); |
| 1291 | return NULL; |
| 1292 | } |
| 1293 | |
| 1294 | static struct dentry * |
| 1295 | event_subsystem_dir(struct trace_array *tr, const char *name, |
| 1296 | struct ftrace_event_file *file, struct dentry *parent) |
| 1297 | { |
| 1298 | struct ftrace_subsystem_dir *dir; |
| 1299 | struct event_subsystem *system; |
| 1300 | struct dentry *entry; |
| 1301 | |
| 1302 | /* First see if we did not already create this dir */ |
| 1303 | list_for_each_entry(dir, &tr->systems, list) { |
| 1304 | system = dir->subsystem; |
| 1305 | if (strcmp(system->name, name) == 0) { |
| 1306 | dir->nr_events++; |
| 1307 | file->system = dir; |
| 1308 | return dir->entry; |
| 1309 | } |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1310 | } |
| 1311 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1312 | /* Now see if the system itself exists. */ |
| 1313 | list_for_each_entry(system, &event_subsystems, list) { |
| 1314 | if (strcmp(system->name, name) == 0) |
| 1315 | break; |
| 1316 | } |
| 1317 | /* Reset system variable when not found */ |
| 1318 | if (&system->list == &event_subsystems) |
| 1319 | system = NULL; |
| 1320 | |
| 1321 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
| 1322 | if (!dir) |
| 1323 | goto out_fail; |
| 1324 | |
| 1325 | if (!system) { |
| 1326 | system = create_new_subsystem(name); |
| 1327 | if (!system) |
| 1328 | goto out_free; |
| 1329 | } else |
| 1330 | __get_system(system); |
| 1331 | |
| 1332 | dir->entry = debugfs_create_dir(name, parent); |
| 1333 | if (!dir->entry) { |
| 1334 | pr_warning("Failed to create system directory %s\n", name); |
| 1335 | __put_system(system); |
| 1336 | goto out_free; |
| 1337 | } |
| 1338 | |
| 1339 | dir->tr = tr; |
| 1340 | dir->ref_count = 1; |
| 1341 | dir->nr_events = 1; |
| 1342 | dir->subsystem = system; |
| 1343 | file->system = dir; |
| 1344 | |
| 1345 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
Tom Zanussi | e1112b4 | 2009-03-31 00:48:49 -0500 | [diff] [blame] | 1346 | &ftrace_subsystem_filter_fops); |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1347 | if (!entry) { |
| 1348 | kfree(system->filter); |
| 1349 | system->filter = NULL; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1350 | pr_warning("Could not create debugfs '%s/filter' entry\n", name); |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1351 | } |
Tom Zanussi | e1112b4 | 2009-03-31 00:48:49 -0500 | [diff] [blame] | 1352 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1353 | trace_create_file("enable", 0644, dir->entry, dir, |
Frederic Weisbecker | f3f3f00 | 2009-09-24 15:27:41 +0200 | [diff] [blame] | 1354 | &ftrace_system_enable_fops); |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1355 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1356 | list_add(&dir->list, &tr->systems); |
| 1357 | |
| 1358 | return dir->entry; |
| 1359 | |
| 1360 | out_free: |
| 1361 | kfree(dir); |
| 1362 | out_fail: |
| 1363 | /* Only print this message if failed on memory allocation */ |
| 1364 | if (!dir || !system) |
| 1365 | pr_warning("No memory to create event subsystem %s\n", |
| 1366 | name); |
| 1367 | return NULL; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1368 | } |
| 1369 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1370 | static int |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1371 | event_create_dir(struct dentry *parent, |
| 1372 | struct ftrace_event_file *file, |
Steven Rostedt | 701970b | 2009-04-24 23:11:22 -0400 | [diff] [blame] | 1373 | const struct file_operations *id, |
| 1374 | const struct file_operations *enable, |
| 1375 | const struct file_operations *filter, |
| 1376 | const struct file_operations *format) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1377 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1378 | struct ftrace_event_call *call = file->event_call; |
| 1379 | struct trace_array *tr = file->tr; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 1380 | struct list_head *head; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1381 | struct dentry *d_events; |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 1382 | int ret; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1383 | |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1384 | /* |
| 1385 | * If the trace point header did not define TRACE_SYSTEM |
| 1386 | * then the system would be called "TRACE_SYSTEM". |
| 1387 | */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1388 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
| 1389 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); |
| 1390 | if (!d_events) |
| 1391 | return -ENOMEM; |
| 1392 | } else |
| 1393 | d_events = parent; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1394 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1395 | file->dir = debugfs_create_dir(call->name, d_events); |
| 1396 | if (!file->dir) { |
| 1397 | pr_warning("Could not create debugfs '%s' directory\n", |
| 1398 | call->name); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1399 | return -1; |
| 1400 | } |
| 1401 | |
Steven Rostedt | 9b63776 | 2012-05-10 15:55:43 -0400 | [diff] [blame] | 1402 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1403 | trace_create_file("enable", 0644, file->dir, file, |
Frederic Weisbecker | f3f3f00 | 2009-09-24 15:27:41 +0200 | [diff] [blame] | 1404 | enable); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1405 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1406 | #ifdef CONFIG_PERF_EVENTS |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 1407 | if (call->event.type && call->class->reg) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1408 | trace_create_file("id", 0444, file->dir, call, |
Frederic Weisbecker | f3f3f00 | 2009-09-24 15:27:41 +0200 | [diff] [blame] | 1409 | id); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1410 | #endif |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1411 | |
Li Zefan | c9d932c | 2010-05-24 16:24:28 +0800 | [diff] [blame] | 1412 | /* |
| 1413 | * Other events may have the same class. Only update |
| 1414 | * the fields if they are not already defined. |
| 1415 | */ |
| 1416 | head = trace_get_fields(call); |
| 1417 | if (list_empty(head)) { |
| 1418 | ret = call->class->define_fields(call); |
| 1419 | if (ret < 0) { |
| 1420 | pr_warning("Could not initialize trace point" |
| 1421 | " events/%s\n", call->name); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1422 | return -1; |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 1423 | } |
| 1424 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1425 | trace_create_file("filter", 0644, file->dir, call, |
Li Zefan | c9d932c | 2010-05-24 16:24:28 +0800 | [diff] [blame] | 1426 | filter); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 1427 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1428 | trace_create_file("format", 0444, file->dir, call, |
Frederic Weisbecker | f3f3f00 | 2009-09-24 15:27:41 +0200 | [diff] [blame] | 1429 | format); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 1430 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1431 | return 0; |
| 1432 | } |
| 1433 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1434 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
| 1435 | { |
| 1436 | if (!dir) |
| 1437 | return; |
| 1438 | |
| 1439 | if (!--dir->nr_events) { |
| 1440 | debugfs_remove_recursive(dir->entry); |
| 1441 | list_del(&dir->list); |
| 1442 | __put_system_dir(dir); |
| 1443 | } |
| 1444 | } |
| 1445 | |
| 1446 | static void remove_event_from_tracers(struct ftrace_event_call *call) |
| 1447 | { |
| 1448 | struct ftrace_event_file *file; |
| 1449 | struct trace_array *tr; |
| 1450 | |
| 1451 | do_for_each_event_file_safe(tr, file) { |
| 1452 | |
| 1453 | if (file->event_call != call) |
| 1454 | continue; |
| 1455 | |
| 1456 | list_del(&file->list); |
| 1457 | debugfs_remove_recursive(file->dir); |
| 1458 | remove_subsystem(file->system); |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 1459 | kmem_cache_free(file_cachep, file); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1460 | |
| 1461 | /* |
| 1462 | * The do_for_each_event_file_safe() is |
| 1463 | * a double loop. After finding the call for this |
| 1464 | * trace_array, we use break to jump to the next |
| 1465 | * trace_array. |
| 1466 | */ |
| 1467 | break; |
| 1468 | } while_for_each_event_file(); |
| 1469 | } |
| 1470 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1471 | static void event_remove(struct ftrace_event_call *call) |
| 1472 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1473 | struct trace_array *tr; |
| 1474 | struct ftrace_event_file *file; |
| 1475 | |
| 1476 | do_for_each_event_file(tr, file) { |
| 1477 | if (file->event_call != call) |
| 1478 | continue; |
| 1479 | ftrace_event_enable_disable(file, 0); |
| 1480 | /* |
| 1481 | * The do_for_each_event_file() is |
| 1482 | * a double loop. After finding the call for this |
| 1483 | * trace_array, we use break to jump to the next |
| 1484 | * trace_array. |
| 1485 | */ |
| 1486 | break; |
| 1487 | } while_for_each_event_file(); |
| 1488 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1489 | if (call->event.funcs) |
| 1490 | __unregister_ftrace_event(&call->event); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1491 | remove_event_from_tracers(call); |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1492 | list_del(&call->list); |
| 1493 | } |
| 1494 | |
| 1495 | static int event_init(struct ftrace_event_call *call) |
| 1496 | { |
| 1497 | int ret = 0; |
| 1498 | |
| 1499 | if (WARN_ON(!call->name)) |
| 1500 | return -EINVAL; |
| 1501 | |
| 1502 | if (call->class->raw_init) { |
| 1503 | ret = call->class->raw_init(call); |
| 1504 | if (ret < 0 && ret != -ENOSYS) |
| 1505 | pr_warn("Could not initialize trace events/%s\n", |
| 1506 | call->name); |
| 1507 | } |
| 1508 | |
| 1509 | return ret; |
| 1510 | } |
| 1511 | |
Li Zefan | 67ead0a | 2010-05-24 16:25:13 +0800 | [diff] [blame] | 1512 | static int |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1513 | __register_event(struct ftrace_event_call *call, struct module *mod) |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1514 | { |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1515 | int ret; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1516 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1517 | ret = event_init(call); |
| 1518 | if (ret < 0) |
| 1519 | return ret; |
Steven Rostedt | 701970b | 2009-04-24 23:11:22 -0400 | [diff] [blame] | 1520 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1521 | list_add(&call->list, &ftrace_events); |
Li Zefan | 67ead0a | 2010-05-24 16:25:13 +0800 | [diff] [blame] | 1522 | call->mod = mod; |
Masami Hiramatsu | 88f70d7 | 2009-09-25 11:20:54 -0700 | [diff] [blame] | 1523 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1524 | return 0; |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1525 | } |
| 1526 | |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 1527 | static struct ftrace_event_file * |
| 1528 | trace_create_new_event(struct ftrace_event_call *call, |
| 1529 | struct trace_array *tr) |
| 1530 | { |
| 1531 | struct ftrace_event_file *file; |
| 1532 | |
| 1533 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); |
| 1534 | if (!file) |
| 1535 | return NULL; |
| 1536 | |
| 1537 | file->event_call = call; |
| 1538 | file->tr = tr; |
| 1539 | atomic_set(&file->sm_ref, 0); |
| 1540 | list_add(&file->list, &tr->events); |
| 1541 | |
| 1542 | return file; |
| 1543 | } |
| 1544 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1545 | /* Add an event to a trace directory */ |
| 1546 | static int |
| 1547 | __trace_add_new_event(struct ftrace_event_call *call, |
| 1548 | struct trace_array *tr, |
| 1549 | const struct file_operations *id, |
| 1550 | const struct file_operations *enable, |
| 1551 | const struct file_operations *filter, |
| 1552 | const struct file_operations *format) |
| 1553 | { |
| 1554 | struct ftrace_event_file *file; |
| 1555 | |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 1556 | file = trace_create_new_event(call, tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1557 | if (!file) |
| 1558 | return -ENOMEM; |
| 1559 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1560 | return event_create_dir(tr->event_dir, file, id, enable, filter, format); |
| 1561 | } |
| 1562 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 1563 | /* |
| 1564 | * Just create a decriptor for early init. A descriptor is required |
| 1565 | * for enabling events at boot. We want to enable events before |
| 1566 | * the filesystem is initialized. |
| 1567 | */ |
| 1568 | static __init int |
| 1569 | __trace_early_add_new_event(struct ftrace_event_call *call, |
| 1570 | struct trace_array *tr) |
| 1571 | { |
| 1572 | struct ftrace_event_file *file; |
| 1573 | |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 1574 | file = trace_create_new_event(call, tr); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 1575 | if (!file) |
| 1576 | return -ENOMEM; |
| 1577 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 1578 | return 0; |
| 1579 | } |
| 1580 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1581 | struct ftrace_module_file_ops; |
| 1582 | static void __add_event_to_tracers(struct ftrace_event_call *call, |
| 1583 | struct ftrace_module_file_ops *file_ops); |
| 1584 | |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1585 | /* Add an additional event_call dynamically */ |
| 1586 | int trace_add_event_call(struct ftrace_event_call *call) |
| 1587 | { |
| 1588 | int ret; |
| 1589 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1590 | |
| 1591 | ret = __register_event(call, NULL); |
| 1592 | if (ret >= 0) |
| 1593 | __add_event_to_tracers(call, NULL); |
| 1594 | |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1595 | mutex_unlock(&event_mutex); |
| 1596 | return ret; |
| 1597 | } |
Steven Rostedt | 701970b | 2009-04-24 23:11:22 -0400 | [diff] [blame] | 1598 | |
Masami Hiramatsu | 4fead8e | 2009-09-14 16:49:12 -0400 | [diff] [blame] | 1599 | /* |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 1600 | * Must be called under locking both of event_mutex and trace_event_sem. |
Masami Hiramatsu | 4fead8e | 2009-09-14 16:49:12 -0400 | [diff] [blame] | 1601 | */ |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1602 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
| 1603 | { |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 1604 | event_remove(call); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1605 | trace_destroy_fields(call); |
| 1606 | destroy_preds(call); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1607 | } |
| 1608 | |
| 1609 | /* Remove an event_call */ |
| 1610 | void trace_remove_event_call(struct ftrace_event_call *call) |
| 1611 | { |
| 1612 | mutex_lock(&event_mutex); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 1613 | down_write(&trace_event_sem); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1614 | __trace_remove_event_call(call); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 1615 | up_write(&trace_event_sem); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1616 | mutex_unlock(&event_mutex); |
| 1617 | } |
| 1618 | |
| 1619 | #define for_each_event(event, start, end) \ |
| 1620 | for (event = start; \ |
| 1621 | (unsigned long)event < (unsigned long)end; \ |
| 1622 | event++) |
| 1623 | |
| 1624 | #ifdef CONFIG_MODULES |
| 1625 | |
| 1626 | static LIST_HEAD(ftrace_module_file_list); |
| 1627 | |
| 1628 | /* |
| 1629 | * Modules must own their file_operations to keep up with |
| 1630 | * reference counting. |
| 1631 | */ |
| 1632 | struct ftrace_module_file_ops { |
| 1633 | struct list_head list; |
| 1634 | struct module *mod; |
| 1635 | struct file_operations id; |
| 1636 | struct file_operations enable; |
| 1637 | struct file_operations format; |
| 1638 | struct file_operations filter; |
| 1639 | }; |
| 1640 | |
Steven Rostedt (Red Hat) | 315326c | 2013-03-02 17:37:14 -0500 | [diff] [blame] | 1641 | static struct ftrace_module_file_ops * |
| 1642 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1643 | { |
Steven Rostedt (Red Hat) | 315326c | 2013-03-02 17:37:14 -0500 | [diff] [blame] | 1644 | /* |
| 1645 | * As event_calls are added in groups by module, |
| 1646 | * when we find one file_ops, we don't need to search for |
| 1647 | * each call in that module, as the rest should be the |
| 1648 | * same. Only search for a new one if the last one did |
| 1649 | * not match. |
| 1650 | */ |
| 1651 | if (file_ops && mod == file_ops->mod) |
| 1652 | return file_ops; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1653 | |
| 1654 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { |
| 1655 | if (file_ops->mod == mod) |
| 1656 | return file_ops; |
| 1657 | } |
| 1658 | return NULL; |
| 1659 | } |
| 1660 | |
Steven Rostedt | 701970b | 2009-04-24 23:11:22 -0400 | [diff] [blame] | 1661 | static struct ftrace_module_file_ops * |
| 1662 | trace_create_file_ops(struct module *mod) |
| 1663 | { |
| 1664 | struct ftrace_module_file_ops *file_ops; |
| 1665 | |
| 1666 | /* |
| 1667 | * This is a bit of a PITA. To allow for correct reference |
| 1668 | * counting, modules must "own" their file_operations. |
| 1669 | * To do this, we allocate the file operations that will be |
| 1670 | * used in the event directory. |
| 1671 | */ |
| 1672 | |
| 1673 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); |
| 1674 | if (!file_ops) |
| 1675 | return NULL; |
| 1676 | |
| 1677 | file_ops->mod = mod; |
| 1678 | |
| 1679 | file_ops->id = ftrace_event_id_fops; |
| 1680 | file_ops->id.owner = mod; |
| 1681 | |
| 1682 | file_ops->enable = ftrace_enable_fops; |
| 1683 | file_ops->enable.owner = mod; |
| 1684 | |
| 1685 | file_ops->filter = ftrace_event_filter_fops; |
| 1686 | file_ops->filter.owner = mod; |
| 1687 | |
| 1688 | file_ops->format = ftrace_event_format_fops; |
| 1689 | file_ops->format.owner = mod; |
| 1690 | |
| 1691 | list_add(&file_ops->list, &ftrace_module_file_list); |
| 1692 | |
| 1693 | return file_ops; |
| 1694 | } |
| 1695 | |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1696 | static void trace_module_add_events(struct module *mod) |
| 1697 | { |
Steven Rostedt | 701970b | 2009-04-24 23:11:22 -0400 | [diff] [blame] | 1698 | struct ftrace_module_file_ops *file_ops = NULL; |
Steven Rostedt | e4a9ea5 | 2011-01-27 09:15:30 -0500 | [diff] [blame] | 1699 | struct ftrace_event_call **call, **start, **end; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1700 | |
| 1701 | start = mod->trace_events; |
| 1702 | end = mod->trace_events + mod->num_trace_events; |
| 1703 | |
| 1704 | if (start == end) |
| 1705 | return; |
| 1706 | |
Li Zefan | 67ead0a | 2010-05-24 16:25:13 +0800 | [diff] [blame] | 1707 | file_ops = trace_create_file_ops(mod); |
| 1708 | if (!file_ops) |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1709 | return; |
| 1710 | |
| 1711 | for_each_event(call, start, end) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1712 | __register_event(*call, mod); |
| 1713 | __add_event_to_tracers(*call, file_ops); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1714 | } |
| 1715 | } |
| 1716 | |
| 1717 | static void trace_module_remove_events(struct module *mod) |
| 1718 | { |
Steven Rostedt | 701970b | 2009-04-24 23:11:22 -0400 | [diff] [blame] | 1719 | struct ftrace_module_file_ops *file_ops; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1720 | struct ftrace_event_call *call, *p; |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 1721 | bool clear_trace = false; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1722 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 1723 | down_write(&trace_event_sem); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1724 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
| 1725 | if (call->mod == mod) { |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 1726 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
| 1727 | clear_trace = true; |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 1728 | __trace_remove_event_call(call); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1729 | } |
| 1730 | } |
Steven Rostedt | 701970b | 2009-04-24 23:11:22 -0400 | [diff] [blame] | 1731 | |
| 1732 | /* Now free the file_operations */ |
| 1733 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { |
| 1734 | if (file_ops->mod == mod) |
| 1735 | break; |
| 1736 | } |
| 1737 | if (&file_ops->list != &ftrace_module_file_list) { |
| 1738 | list_del(&file_ops->list); |
| 1739 | kfree(file_ops); |
| 1740 | } |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 1741 | up_write(&trace_event_sem); |
Steven Rostedt | 9456f0f | 2009-05-06 21:54:09 -0400 | [diff] [blame] | 1742 | |
| 1743 | /* |
| 1744 | * 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] | 1745 | * registered any events that were used. The only worry is if |
| 1746 | * a new module gets loaded, and takes on the same id as the events |
| 1747 | * of this module. When printing out the buffer, traced events left |
| 1748 | * over from this module may be passed to the new module events and |
| 1749 | * unexpected results may occur. |
Steven Rostedt | 9456f0f | 2009-05-06 21:54:09 -0400 | [diff] [blame] | 1750 | */ |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 1751 | if (clear_trace) |
Steven Rostedt (Red Hat) | 873c642 | 2013-03-04 23:26:06 -0500 | [diff] [blame] | 1752 | tracing_reset_all_online_cpus(); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1753 | } |
| 1754 | |
Steven Rostedt | 61f919a | 2009-04-14 18:22:32 -0400 | [diff] [blame] | 1755 | static int trace_module_notify(struct notifier_block *self, |
| 1756 | unsigned long val, void *data) |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1757 | { |
| 1758 | struct module *mod = data; |
| 1759 | |
| 1760 | mutex_lock(&event_mutex); |
| 1761 | switch (val) { |
| 1762 | case MODULE_STATE_COMING: |
| 1763 | trace_module_add_events(mod); |
| 1764 | break; |
| 1765 | case MODULE_STATE_GOING: |
| 1766 | trace_module_remove_events(mod); |
| 1767 | break; |
| 1768 | } |
| 1769 | mutex_unlock(&event_mutex); |
| 1770 | |
| 1771 | return 0; |
| 1772 | } |
Steven Rostedt (Red Hat) | 315326c | 2013-03-02 17:37:14 -0500 | [diff] [blame] | 1773 | |
| 1774 | static int |
| 1775 | __trace_add_new_mod_event(struct ftrace_event_call *call, |
| 1776 | struct trace_array *tr, |
| 1777 | struct ftrace_module_file_ops *file_ops) |
| 1778 | { |
| 1779 | return __trace_add_new_event(call, tr, |
| 1780 | &file_ops->id, &file_ops->enable, |
| 1781 | &file_ops->filter, &file_ops->format); |
| 1782 | } |
| 1783 | |
Steven Rostedt | 61f919a | 2009-04-14 18:22:32 -0400 | [diff] [blame] | 1784 | #else |
Steven Rostedt (Red Hat) | 315326c | 2013-03-02 17:37:14 -0500 | [diff] [blame] | 1785 | static inline struct ftrace_module_file_ops * |
| 1786 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1787 | { |
| 1788 | return NULL; |
| 1789 | } |
Steven Rostedt (Red Hat) | 315326c | 2013-03-02 17:37:14 -0500 | [diff] [blame] | 1790 | static inline int trace_module_notify(struct notifier_block *self, |
| 1791 | unsigned long val, void *data) |
Steven Rostedt | 61f919a | 2009-04-14 18:22:32 -0400 | [diff] [blame] | 1792 | { |
| 1793 | return 0; |
| 1794 | } |
Steven Rostedt (Red Hat) | 315326c | 2013-03-02 17:37:14 -0500 | [diff] [blame] | 1795 | static inline int |
| 1796 | __trace_add_new_mod_event(struct ftrace_event_call *call, |
| 1797 | struct trace_array *tr, |
| 1798 | struct ftrace_module_file_ops *file_ops) |
| 1799 | { |
| 1800 | return -ENODEV; |
| 1801 | } |
Steven Rostedt | 61f919a | 2009-04-14 18:22:32 -0400 | [diff] [blame] | 1802 | #endif /* CONFIG_MODULES */ |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 1803 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1804 | /* Create a new event directory structure for a trace directory. */ |
| 1805 | static void |
| 1806 | __trace_add_event_dirs(struct trace_array *tr) |
| 1807 | { |
| 1808 | struct ftrace_module_file_ops *file_ops = NULL; |
| 1809 | struct ftrace_event_call *call; |
| 1810 | int ret; |
| 1811 | |
| 1812 | list_for_each_entry(call, &ftrace_events, list) { |
| 1813 | if (call->mod) { |
| 1814 | /* |
| 1815 | * Directories for events by modules need to |
| 1816 | * keep module ref counts when opened (as we don't |
| 1817 | * want the module to disappear when reading one |
| 1818 | * of these files). The file_ops keep account of |
| 1819 | * the module ref count. |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1820 | */ |
Steven Rostedt (Red Hat) | 315326c | 2013-03-02 17:37:14 -0500 | [diff] [blame] | 1821 | file_ops = find_ftrace_file_ops(file_ops, call->mod); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1822 | if (!file_ops) |
| 1823 | continue; /* Warn? */ |
Steven Rostedt (Red Hat) | 315326c | 2013-03-02 17:37:14 -0500 | [diff] [blame] | 1824 | ret = __trace_add_new_mod_event(call, tr, file_ops); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1825 | if (ret < 0) |
| 1826 | pr_warning("Could not create directory for event %s\n", |
| 1827 | call->name); |
| 1828 | continue; |
| 1829 | } |
| 1830 | ret = __trace_add_new_event(call, tr, |
| 1831 | &ftrace_event_id_fops, |
| 1832 | &ftrace_enable_fops, |
| 1833 | &ftrace_event_filter_fops, |
| 1834 | &ftrace_event_format_fops); |
| 1835 | if (ret < 0) |
| 1836 | pr_warning("Could not create directory for event %s\n", |
| 1837 | call->name); |
| 1838 | } |
| 1839 | } |
| 1840 | |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 1841 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 1842 | |
| 1843 | /* Avoid typos */ |
| 1844 | #define ENABLE_EVENT_STR "enable_event" |
| 1845 | #define DISABLE_EVENT_STR "disable_event" |
| 1846 | |
| 1847 | struct event_probe_data { |
| 1848 | struct ftrace_event_file *file; |
| 1849 | unsigned long count; |
| 1850 | int ref; |
| 1851 | bool enable; |
| 1852 | }; |
| 1853 | |
| 1854 | static struct ftrace_event_file * |
| 1855 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
| 1856 | { |
| 1857 | struct ftrace_event_file *file; |
| 1858 | struct ftrace_event_call *call; |
| 1859 | |
| 1860 | list_for_each_entry(file, &tr->events, list) { |
| 1861 | |
| 1862 | call = file->event_call; |
| 1863 | |
| 1864 | if (!call->name || !call->class || !call->class->reg) |
| 1865 | continue; |
| 1866 | |
| 1867 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
| 1868 | continue; |
| 1869 | |
| 1870 | if (strcmp(event, call->name) == 0 && |
| 1871 | strcmp(system, call->class->system) == 0) |
| 1872 | return file; |
| 1873 | } |
| 1874 | return NULL; |
| 1875 | } |
| 1876 | |
| 1877 | static void |
| 1878 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) |
| 1879 | { |
| 1880 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 1881 | struct event_probe_data *data = *pdata; |
| 1882 | |
| 1883 | if (!data) |
| 1884 | return; |
| 1885 | |
| 1886 | if (data->enable) |
| 1887 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); |
| 1888 | else |
| 1889 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); |
| 1890 | } |
| 1891 | |
| 1892 | static void |
| 1893 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) |
| 1894 | { |
| 1895 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 1896 | struct event_probe_data *data = *pdata; |
| 1897 | |
| 1898 | if (!data) |
| 1899 | return; |
| 1900 | |
| 1901 | if (!data->count) |
| 1902 | return; |
| 1903 | |
| 1904 | /* Skip if the event is in a state we want to switch to */ |
| 1905 | if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED)) |
| 1906 | return; |
| 1907 | |
| 1908 | if (data->count != -1) |
| 1909 | (data->count)--; |
| 1910 | |
| 1911 | event_enable_probe(ip, parent_ip, _data); |
| 1912 | } |
| 1913 | |
| 1914 | static int |
| 1915 | event_enable_print(struct seq_file *m, unsigned long ip, |
| 1916 | struct ftrace_probe_ops *ops, void *_data) |
| 1917 | { |
| 1918 | struct event_probe_data *data = _data; |
| 1919 | |
| 1920 | seq_printf(m, "%ps:", (void *)ip); |
| 1921 | |
| 1922 | seq_printf(m, "%s:%s:%s", |
| 1923 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, |
| 1924 | data->file->event_call->class->system, |
| 1925 | data->file->event_call->name); |
| 1926 | |
| 1927 | if (data->count == -1) |
| 1928 | seq_printf(m, ":unlimited\n"); |
| 1929 | else |
| 1930 | seq_printf(m, ":count=%ld\n", data->count); |
| 1931 | |
| 1932 | return 0; |
| 1933 | } |
| 1934 | |
| 1935 | static int |
| 1936 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, |
| 1937 | void **_data) |
| 1938 | { |
| 1939 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 1940 | struct event_probe_data *data = *pdata; |
| 1941 | |
| 1942 | data->ref++; |
| 1943 | return 0; |
| 1944 | } |
| 1945 | |
| 1946 | static void |
| 1947 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, |
| 1948 | void **_data) |
| 1949 | { |
| 1950 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 1951 | struct event_probe_data *data = *pdata; |
| 1952 | |
| 1953 | if (WARN_ON_ONCE(data->ref <= 0)) |
| 1954 | return; |
| 1955 | |
| 1956 | data->ref--; |
| 1957 | if (!data->ref) { |
| 1958 | /* Remove the SOFT_MODE flag */ |
| 1959 | __ftrace_event_enable_disable(data->file, 0, 1); |
| 1960 | module_put(data->file->event_call->mod); |
| 1961 | kfree(data); |
| 1962 | } |
| 1963 | *pdata = NULL; |
| 1964 | } |
| 1965 | |
| 1966 | static struct ftrace_probe_ops event_enable_probe_ops = { |
| 1967 | .func = event_enable_probe, |
| 1968 | .print = event_enable_print, |
| 1969 | .init = event_enable_init, |
| 1970 | .free = event_enable_free, |
| 1971 | }; |
| 1972 | |
| 1973 | static struct ftrace_probe_ops event_enable_count_probe_ops = { |
| 1974 | .func = event_enable_count_probe, |
| 1975 | .print = event_enable_print, |
| 1976 | .init = event_enable_init, |
| 1977 | .free = event_enable_free, |
| 1978 | }; |
| 1979 | |
| 1980 | static struct ftrace_probe_ops event_disable_probe_ops = { |
| 1981 | .func = event_enable_probe, |
| 1982 | .print = event_enable_print, |
| 1983 | .init = event_enable_init, |
| 1984 | .free = event_enable_free, |
| 1985 | }; |
| 1986 | |
| 1987 | static struct ftrace_probe_ops event_disable_count_probe_ops = { |
| 1988 | .func = event_enable_count_probe, |
| 1989 | .print = event_enable_print, |
| 1990 | .init = event_enable_init, |
| 1991 | .free = event_enable_free, |
| 1992 | }; |
| 1993 | |
| 1994 | static int |
| 1995 | event_enable_func(struct ftrace_hash *hash, |
| 1996 | char *glob, char *cmd, char *param, int enabled) |
| 1997 | { |
| 1998 | struct trace_array *tr = top_trace_array(); |
| 1999 | struct ftrace_event_file *file; |
| 2000 | struct ftrace_probe_ops *ops; |
| 2001 | struct event_probe_data *data; |
| 2002 | const char *system; |
| 2003 | const char *event; |
| 2004 | char *number; |
| 2005 | bool enable; |
| 2006 | int ret; |
| 2007 | |
| 2008 | /* hash funcs only work with set_ftrace_filter */ |
Harsh Prateek Bora | 8092e80 | 2013-05-24 12:52:17 +0530 | [diff] [blame] | 2009 | if (!enabled || !param) |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2010 | return -EINVAL; |
| 2011 | |
| 2012 | system = strsep(¶m, ":"); |
| 2013 | if (!param) |
| 2014 | return -EINVAL; |
| 2015 | |
| 2016 | event = strsep(¶m, ":"); |
| 2017 | |
| 2018 | mutex_lock(&event_mutex); |
| 2019 | |
| 2020 | ret = -EINVAL; |
| 2021 | file = find_event_file(tr, system, event); |
| 2022 | if (!file) |
| 2023 | goto out; |
| 2024 | |
| 2025 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; |
| 2026 | |
| 2027 | if (enable) |
| 2028 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; |
| 2029 | else |
| 2030 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; |
| 2031 | |
| 2032 | if (glob[0] == '!') { |
| 2033 | unregister_ftrace_function_probe_func(glob+1, ops); |
| 2034 | ret = 0; |
| 2035 | goto out; |
| 2036 | } |
| 2037 | |
| 2038 | ret = -ENOMEM; |
| 2039 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
| 2040 | if (!data) |
| 2041 | goto out; |
| 2042 | |
| 2043 | data->enable = enable; |
| 2044 | data->count = -1; |
| 2045 | data->file = file; |
| 2046 | |
| 2047 | if (!param) |
| 2048 | goto out_reg; |
| 2049 | |
| 2050 | number = strsep(¶m, ":"); |
| 2051 | |
| 2052 | ret = -EINVAL; |
| 2053 | if (!strlen(number)) |
| 2054 | goto out_free; |
| 2055 | |
| 2056 | /* |
| 2057 | * We use the callback data field (which is a pointer) |
| 2058 | * as our counter. |
| 2059 | */ |
| 2060 | ret = kstrtoul(number, 0, &data->count); |
| 2061 | if (ret) |
| 2062 | goto out_free; |
| 2063 | |
| 2064 | out_reg: |
| 2065 | /* Don't let event modules unload while probe registered */ |
| 2066 | ret = try_module_get(file->event_call->mod); |
Masami Hiramatsu | 6ed0106 | 2013-05-16 20:48:49 +0900 | [diff] [blame] | 2067 | if (!ret) { |
| 2068 | ret = -EBUSY; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2069 | goto out_free; |
Masami Hiramatsu | 6ed0106 | 2013-05-16 20:48:49 +0900 | [diff] [blame] | 2070 | } |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2071 | |
| 2072 | ret = __ftrace_event_enable_disable(file, 1, 1); |
| 2073 | if (ret < 0) |
| 2074 | goto out_put; |
| 2075 | ret = register_ftrace_function_probe(glob, ops, data); |
Steven Rostedt (Red Hat) | ff305de | 2013-05-09 11:30:26 -0400 | [diff] [blame] | 2076 | /* |
| 2077 | * The above returns on success the # of functions enabled, |
| 2078 | * but if it didn't find any functions it returns zero. |
| 2079 | * Consider no functions a failure too. |
| 2080 | */ |
Masami Hiramatsu | a5b85bd | 2013-05-09 14:44:14 +0900 | [diff] [blame] | 2081 | if (!ret) { |
| 2082 | ret = -ENOENT; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2083 | goto out_disable; |
Steven Rostedt (Red Hat) | ff305de | 2013-05-09 11:30:26 -0400 | [diff] [blame] | 2084 | } else if (ret < 0) |
| 2085 | goto out_disable; |
| 2086 | /* Just return zero, not the number of enabled functions */ |
| 2087 | ret = 0; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2088 | out: |
| 2089 | mutex_unlock(&event_mutex); |
| 2090 | return ret; |
| 2091 | |
| 2092 | out_disable: |
| 2093 | __ftrace_event_enable_disable(file, 0, 1); |
| 2094 | out_put: |
| 2095 | module_put(file->event_call->mod); |
| 2096 | out_free: |
| 2097 | kfree(data); |
| 2098 | goto out; |
| 2099 | } |
| 2100 | |
| 2101 | static struct ftrace_func_command event_enable_cmd = { |
| 2102 | .name = ENABLE_EVENT_STR, |
| 2103 | .func = event_enable_func, |
| 2104 | }; |
| 2105 | |
| 2106 | static struct ftrace_func_command event_disable_cmd = { |
| 2107 | .name = DISABLE_EVENT_STR, |
| 2108 | .func = event_enable_func, |
| 2109 | }; |
| 2110 | |
| 2111 | static __init int register_event_cmds(void) |
| 2112 | { |
| 2113 | int ret; |
| 2114 | |
| 2115 | ret = register_ftrace_command(&event_enable_cmd); |
| 2116 | if (WARN_ON(ret < 0)) |
| 2117 | return ret; |
| 2118 | ret = register_ftrace_command(&event_disable_cmd); |
| 2119 | if (WARN_ON(ret < 0)) |
| 2120 | unregister_ftrace_command(&event_enable_cmd); |
| 2121 | return ret; |
| 2122 | } |
| 2123 | #else |
| 2124 | static inline int register_event_cmds(void) { return 0; } |
| 2125 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
| 2126 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2127 | /* |
| 2128 | * The top level array has already had its ftrace_event_file |
| 2129 | * descriptors created in order to allow for early events to |
| 2130 | * be recorded. This function is called after the debugfs has been |
| 2131 | * initialized, and we now have to create the files associated |
| 2132 | * to the events. |
| 2133 | */ |
| 2134 | static __init void |
| 2135 | __trace_early_add_event_dirs(struct trace_array *tr) |
| 2136 | { |
| 2137 | struct ftrace_event_file *file; |
| 2138 | int ret; |
| 2139 | |
| 2140 | |
| 2141 | list_for_each_entry(file, &tr->events, list) { |
| 2142 | ret = event_create_dir(tr->event_dir, file, |
| 2143 | &ftrace_event_id_fops, |
| 2144 | &ftrace_enable_fops, |
| 2145 | &ftrace_event_filter_fops, |
| 2146 | &ftrace_event_format_fops); |
| 2147 | if (ret < 0) |
| 2148 | pr_warning("Could not create directory for event %s\n", |
| 2149 | file->event_call->name); |
| 2150 | } |
| 2151 | } |
| 2152 | |
| 2153 | /* |
| 2154 | * For early boot up, the top trace array requires to have |
| 2155 | * a list of events that can be enabled. This must be done before |
| 2156 | * the filesystem is set up in order to allow events to be traced |
| 2157 | * early. |
| 2158 | */ |
| 2159 | static __init void |
| 2160 | __trace_early_add_events(struct trace_array *tr) |
| 2161 | { |
| 2162 | struct ftrace_event_call *call; |
| 2163 | int ret; |
| 2164 | |
| 2165 | list_for_each_entry(call, &ftrace_events, list) { |
| 2166 | /* Early boot up should not have any modules loaded */ |
| 2167 | if (WARN_ON_ONCE(call->mod)) |
| 2168 | continue; |
| 2169 | |
| 2170 | ret = __trace_early_add_new_event(call, tr); |
| 2171 | if (ret < 0) |
| 2172 | pr_warning("Could not create early event %s\n", |
| 2173 | call->name); |
| 2174 | } |
| 2175 | } |
| 2176 | |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2177 | /* Remove the event directory structure for a trace directory. */ |
| 2178 | static void |
| 2179 | __trace_remove_event_dirs(struct trace_array *tr) |
| 2180 | { |
| 2181 | struct ftrace_event_file *file, *next; |
| 2182 | |
| 2183 | list_for_each_entry_safe(file, next, &tr->events, list) { |
| 2184 | list_del(&file->list); |
| 2185 | debugfs_remove_recursive(file->dir); |
| 2186 | remove_subsystem(file->system); |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 2187 | kmem_cache_free(file_cachep, file); |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2188 | } |
| 2189 | } |
| 2190 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2191 | static void |
| 2192 | __add_event_to_tracers(struct ftrace_event_call *call, |
| 2193 | struct ftrace_module_file_ops *file_ops) |
| 2194 | { |
| 2195 | struct trace_array *tr; |
| 2196 | |
| 2197 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
| 2198 | if (file_ops) |
Steven Rostedt (Red Hat) | 315326c | 2013-03-02 17:37:14 -0500 | [diff] [blame] | 2199 | __trace_add_new_mod_event(call, tr, file_ops); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2200 | else |
| 2201 | __trace_add_new_event(call, tr, |
| 2202 | &ftrace_event_id_fops, |
| 2203 | &ftrace_enable_fops, |
| 2204 | &ftrace_event_filter_fops, |
| 2205 | &ftrace_event_format_fops); |
| 2206 | } |
| 2207 | } |
| 2208 | |
Steven Rostedt | ec827c7 | 2009-09-14 10:50:23 -0400 | [diff] [blame] | 2209 | static struct notifier_block trace_module_nb = { |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2210 | .notifier_call = trace_module_notify, |
| 2211 | .priority = 0, |
| 2212 | }; |
| 2213 | |
Steven Rostedt | e4a9ea5 | 2011-01-27 09:15:30 -0500 | [diff] [blame] | 2214 | extern struct ftrace_event_call *__start_ftrace_events[]; |
| 2215 | extern struct ftrace_event_call *__stop_ftrace_events[]; |
Steven Rostedt | a59fd60 | 2009-04-10 13:52:20 -0400 | [diff] [blame] | 2216 | |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 2217 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
| 2218 | |
| 2219 | static __init int setup_trace_event(char *str) |
| 2220 | { |
| 2221 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); |
Steven Rostedt (Red Hat) | 55034cd | 2013-03-07 22:48:09 -0500 | [diff] [blame] | 2222 | ring_buffer_expanded = true; |
| 2223 | tracing_selftest_disabled = true; |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 2224 | |
| 2225 | return 1; |
| 2226 | } |
| 2227 | __setup("trace_event=", setup_trace_event); |
| 2228 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2229 | /* Expects to have event_mutex held when called */ |
| 2230 | static int |
| 2231 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2232 | { |
| 2233 | struct dentry *d_events; |
| 2234 | struct dentry *entry; |
| 2235 | |
| 2236 | entry = debugfs_create_file("set_event", 0644, parent, |
| 2237 | tr, &ftrace_set_event_fops); |
| 2238 | if (!entry) { |
| 2239 | pr_warning("Could not create debugfs 'set_event' entry\n"); |
| 2240 | return -ENOMEM; |
| 2241 | } |
| 2242 | |
| 2243 | d_events = debugfs_create_dir("events", parent); |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2244 | if (!d_events) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2245 | pr_warning("Could not create debugfs 'events' directory\n"); |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2246 | return -ENOMEM; |
| 2247 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2248 | |
| 2249 | /* ring buffer internal formats */ |
| 2250 | trace_create_file("header_page", 0444, d_events, |
| 2251 | ring_buffer_print_page_header, |
| 2252 | &ftrace_show_header_fops); |
| 2253 | |
| 2254 | trace_create_file("header_event", 0444, d_events, |
| 2255 | ring_buffer_print_entry_header, |
| 2256 | &ftrace_show_header_fops); |
| 2257 | |
| 2258 | trace_create_file("enable", 0644, d_events, |
| 2259 | tr, &ftrace_tr_enable_fops); |
| 2260 | |
| 2261 | tr->event_dir = d_events; |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2262 | |
| 2263 | return 0; |
| 2264 | } |
| 2265 | |
| 2266 | /** |
| 2267 | * event_trace_add_tracer - add a instance of a trace_array to events |
| 2268 | * @parent: The parent dentry to place the files/directories for events in |
| 2269 | * @tr: The trace array associated with these events |
| 2270 | * |
| 2271 | * When a new instance is created, it needs to set up its events |
| 2272 | * directory, as well as other files associated with events. It also |
| 2273 | * creates the event hierachry in the @parent/events directory. |
| 2274 | * |
| 2275 | * Returns 0 on success. |
| 2276 | */ |
| 2277 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) |
| 2278 | { |
| 2279 | int ret; |
| 2280 | |
| 2281 | mutex_lock(&event_mutex); |
| 2282 | |
| 2283 | ret = create_event_toplevel_files(parent, tr); |
| 2284 | if (ret) |
| 2285 | goto out_unlock; |
| 2286 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2287 | down_write(&trace_event_sem); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2288 | __trace_add_event_dirs(tr); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2289 | up_write(&trace_event_sem); |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2290 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2291 | out_unlock: |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2292 | mutex_unlock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2293 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2294 | return ret; |
| 2295 | } |
| 2296 | |
| 2297 | /* |
| 2298 | * The top trace array already had its file descriptors created. |
| 2299 | * Now the files themselves need to be created. |
| 2300 | */ |
| 2301 | static __init int |
| 2302 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) |
| 2303 | { |
| 2304 | int ret; |
| 2305 | |
| 2306 | mutex_lock(&event_mutex); |
| 2307 | |
| 2308 | ret = create_event_toplevel_files(parent, tr); |
| 2309 | if (ret) |
| 2310 | goto out_unlock; |
| 2311 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2312 | down_write(&trace_event_sem); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2313 | __trace_early_add_event_dirs(tr); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2314 | up_write(&trace_event_sem); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2315 | |
| 2316 | out_unlock: |
| 2317 | mutex_unlock(&event_mutex); |
| 2318 | |
| 2319 | return ret; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2320 | } |
| 2321 | |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2322 | int event_trace_del_tracer(struct trace_array *tr) |
| 2323 | { |
| 2324 | /* Disable any running events */ |
| 2325 | __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
| 2326 | |
| 2327 | mutex_lock(&event_mutex); |
| 2328 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2329 | down_write(&trace_event_sem); |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2330 | __trace_remove_event_dirs(tr); |
| 2331 | debugfs_remove_recursive(tr->event_dir); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2332 | up_write(&trace_event_sem); |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2333 | |
| 2334 | tr->event_dir = NULL; |
| 2335 | |
| 2336 | mutex_unlock(&event_mutex); |
| 2337 | |
| 2338 | return 0; |
| 2339 | } |
| 2340 | |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 2341 | static __init int event_trace_memsetup(void) |
| 2342 | { |
| 2343 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); |
| 2344 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); |
| 2345 | return 0; |
| 2346 | } |
| 2347 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2348 | static __init int event_trace_enable(void) |
| 2349 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2350 | struct trace_array *tr = top_trace_array(); |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2351 | struct ftrace_event_call **iter, *call; |
| 2352 | char *buf = bootup_event_buf; |
| 2353 | char *token; |
| 2354 | int ret; |
| 2355 | |
| 2356 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
| 2357 | |
| 2358 | call = *iter; |
| 2359 | ret = event_init(call); |
| 2360 | if (!ret) |
| 2361 | list_add(&call->list, &ftrace_events); |
| 2362 | } |
| 2363 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2364 | /* |
| 2365 | * We need the top trace array to have a working set of trace |
| 2366 | * points at early init, before the debug files and directories |
| 2367 | * are created. Create the file entries now, and attach them |
| 2368 | * to the actual file dentries later. |
| 2369 | */ |
| 2370 | __trace_early_add_events(tr); |
| 2371 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2372 | while (true) { |
| 2373 | token = strsep(&buf, ","); |
| 2374 | |
| 2375 | if (!token) |
| 2376 | break; |
| 2377 | if (!*token) |
| 2378 | continue; |
| 2379 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2380 | ret = ftrace_set_clr_event(tr, token, 1); |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2381 | if (ret) |
| 2382 | pr_warn("Failed to enable trace event: %s\n", token); |
| 2383 | } |
Steven Rostedt | 8169883 | 2012-10-11 10:15:05 -0400 | [diff] [blame] | 2384 | |
| 2385 | trace_printk_start_comm(); |
| 2386 | |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2387 | register_event_cmds(); |
| 2388 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2389 | return 0; |
| 2390 | } |
| 2391 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2392 | static __init int event_trace_init(void) |
| 2393 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2394 | struct trace_array *tr; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2395 | struct dentry *d_tracer; |
| 2396 | struct dentry *entry; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2397 | int ret; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2398 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2399 | tr = top_trace_array(); |
| 2400 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2401 | d_tracer = tracing_init_dentry(); |
| 2402 | if (!d_tracer) |
| 2403 | return 0; |
| 2404 | |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 2405 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2406 | tr, &ftrace_avail_fops); |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 2407 | if (!entry) |
| 2408 | pr_warning("Could not create debugfs " |
| 2409 | "'available_events' entry\n"); |
| 2410 | |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 2411 | if (trace_define_common_fields()) |
| 2412 | pr_warning("tracing: Failed to allocate common fields"); |
| 2413 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2414 | ret = early_event_add_tracer(d_tracer, tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2415 | if (ret) |
| 2416 | return ret; |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 2417 | |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2418 | ret = register_module_notifier(&trace_module_nb); |
Ming Lei | 5537937 | 2009-05-18 23:04:46 +0800 | [diff] [blame] | 2419 | if (ret) |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2420 | pr_warning("Failed to register trace events module notifier\n"); |
| 2421 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2422 | return 0; |
| 2423 | } |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 2424 | early_initcall(event_trace_memsetup); |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2425 | core_initcall(event_trace_enable); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 2426 | fs_initcall(event_trace_init); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2427 | |
| 2428 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 2429 | |
| 2430 | static DEFINE_SPINLOCK(test_spinlock); |
| 2431 | static DEFINE_SPINLOCK(test_spinlock_irq); |
| 2432 | static DEFINE_MUTEX(test_mutex); |
| 2433 | |
| 2434 | static __init void test_work(struct work_struct *dummy) |
| 2435 | { |
| 2436 | spin_lock(&test_spinlock); |
| 2437 | spin_lock_irq(&test_spinlock_irq); |
| 2438 | udelay(1); |
| 2439 | spin_unlock_irq(&test_spinlock_irq); |
| 2440 | spin_unlock(&test_spinlock); |
| 2441 | |
| 2442 | mutex_lock(&test_mutex); |
| 2443 | msleep(1); |
| 2444 | mutex_unlock(&test_mutex); |
| 2445 | } |
| 2446 | |
| 2447 | static __init int event_test_thread(void *unused) |
| 2448 | { |
| 2449 | void *test_malloc; |
| 2450 | |
| 2451 | test_malloc = kmalloc(1234, GFP_KERNEL); |
| 2452 | if (!test_malloc) |
| 2453 | pr_info("failed to kmalloc\n"); |
| 2454 | |
| 2455 | schedule_on_each_cpu(test_work); |
| 2456 | |
| 2457 | kfree(test_malloc); |
| 2458 | |
| 2459 | set_current_state(TASK_INTERRUPTIBLE); |
| 2460 | while (!kthread_should_stop()) |
| 2461 | schedule(); |
| 2462 | |
| 2463 | return 0; |
| 2464 | } |
| 2465 | |
| 2466 | /* |
| 2467 | * Do various things that may trigger events. |
| 2468 | */ |
| 2469 | static __init void event_test_stuff(void) |
| 2470 | { |
| 2471 | struct task_struct *test_thread; |
| 2472 | |
| 2473 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); |
| 2474 | msleep(1); |
| 2475 | kthread_stop(test_thread); |
| 2476 | } |
| 2477 | |
| 2478 | /* |
| 2479 | * For every trace event defined, we will test each trace point separately, |
| 2480 | * and then by groups, and finally all trace points. |
| 2481 | */ |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2482 | static __init void event_trace_self_tests(void) |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2483 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2484 | struct ftrace_subsystem_dir *dir; |
| 2485 | struct ftrace_event_file *file; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2486 | struct ftrace_event_call *call; |
| 2487 | struct event_subsystem *system; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2488 | struct trace_array *tr; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2489 | int ret; |
| 2490 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2491 | tr = top_trace_array(); |
| 2492 | |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2493 | pr_info("Running tests on trace events:\n"); |
| 2494 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2495 | list_for_each_entry(file, &tr->events, list) { |
| 2496 | |
| 2497 | call = file->event_call; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2498 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 2499 | /* Only test those that have a probe */ |
| 2500 | if (!call->class || !call->class->probe) |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2501 | continue; |
| 2502 | |
Steven Rostedt | 1f5a6b4 | 2009-09-14 11:58:24 -0400 | [diff] [blame] | 2503 | /* |
| 2504 | * Testing syscall events here is pretty useless, but |
| 2505 | * we still do it if configured. But this is time consuming. |
| 2506 | * What we really need is a user thread to perform the |
| 2507 | * syscalls as we test. |
| 2508 | */ |
| 2509 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 2510 | if (call->class->system && |
| 2511 | strcmp(call->class->system, "syscalls") == 0) |
Steven Rostedt | 1f5a6b4 | 2009-09-14 11:58:24 -0400 | [diff] [blame] | 2512 | continue; |
| 2513 | #endif |
| 2514 | |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2515 | pr_info("Testing event %s: ", call->name); |
| 2516 | |
| 2517 | /* |
| 2518 | * If an event is already enabled, someone is using |
| 2519 | * it and the self test should not be on. |
| 2520 | */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2521 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2522 | pr_warning("Enabled event during self test!\n"); |
| 2523 | WARN_ON_ONCE(1); |
| 2524 | continue; |
| 2525 | } |
| 2526 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2527 | ftrace_event_enable_disable(file, 1); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2528 | event_test_stuff(); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2529 | ftrace_event_enable_disable(file, 0); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2530 | |
| 2531 | pr_cont("OK\n"); |
| 2532 | } |
| 2533 | |
| 2534 | /* Now test at the sub system level */ |
| 2535 | |
| 2536 | pr_info("Running tests on trace event systems:\n"); |
| 2537 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2538 | list_for_each_entry(dir, &tr->systems, list) { |
| 2539 | |
| 2540 | system = dir->subsystem; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2541 | |
| 2542 | /* the ftrace system is special, skip it */ |
| 2543 | if (strcmp(system->name, "ftrace") == 0) |
| 2544 | continue; |
| 2545 | |
| 2546 | pr_info("Testing event system %s: ", system->name); |
| 2547 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2548 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2549 | if (WARN_ON_ONCE(ret)) { |
| 2550 | pr_warning("error enabling system %s\n", |
| 2551 | system->name); |
| 2552 | continue; |
| 2553 | } |
| 2554 | |
| 2555 | event_test_stuff(); |
| 2556 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2557 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
Yuanhan Liu | 76bab1b | 2012-08-27 15:13:45 +0800 | [diff] [blame] | 2558 | if (WARN_ON_ONCE(ret)) { |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2559 | pr_warning("error disabling system %s\n", |
| 2560 | system->name); |
Yuanhan Liu | 76bab1b | 2012-08-27 15:13:45 +0800 | [diff] [blame] | 2561 | continue; |
| 2562 | } |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2563 | |
| 2564 | pr_cont("OK\n"); |
| 2565 | } |
| 2566 | |
| 2567 | /* Test with all events enabled */ |
| 2568 | |
| 2569 | pr_info("Running tests on all trace events:\n"); |
| 2570 | pr_info("Testing all events: "); |
| 2571 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2572 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2573 | if (WARN_ON_ONCE(ret)) { |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2574 | pr_warning("error enabling all events\n"); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2575 | return; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2576 | } |
| 2577 | |
| 2578 | event_test_stuff(); |
| 2579 | |
| 2580 | /* reset sysname */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2581 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2582 | if (WARN_ON_ONCE(ret)) { |
| 2583 | pr_warning("error disabling all events\n"); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2584 | return; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2585 | } |
| 2586 | |
| 2587 | pr_cont("OK\n"); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2588 | } |
| 2589 | |
| 2590 | #ifdef CONFIG_FUNCTION_TRACER |
| 2591 | |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 2592 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2593 | |
| 2594 | static void |
Steven Rostedt | 2f5f6ad | 2011-08-08 16:57:47 -0400 | [diff] [blame] | 2595 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
Steven Rostedt | a1e2e31 | 2011-08-09 12:50:46 -0400 | [diff] [blame] | 2596 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2597 | { |
| 2598 | struct ring_buffer_event *event; |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 2599 | struct ring_buffer *buffer; |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2600 | struct ftrace_entry *entry; |
| 2601 | unsigned long flags; |
| 2602 | long disabled; |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2603 | int cpu; |
| 2604 | int pc; |
| 2605 | |
| 2606 | pc = preempt_count(); |
Steven Rostedt | 5168ae5 | 2010-06-03 09:36:50 -0400 | [diff] [blame] | 2607 | preempt_disable_notrace(); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2608 | cpu = raw_smp_processor_id(); |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 2609 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2610 | |
| 2611 | if (disabled != 1) |
| 2612 | goto out; |
| 2613 | |
| 2614 | local_save_flags(flags); |
| 2615 | |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 2616 | event = trace_current_buffer_lock_reserve(&buffer, |
| 2617 | TRACE_FN, sizeof(*entry), |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2618 | flags, pc); |
| 2619 | if (!event) |
| 2620 | goto out; |
| 2621 | entry = ring_buffer_event_data(event); |
| 2622 | entry->ip = ip; |
| 2623 | entry->parent_ip = parent_ip; |
| 2624 | |
Steven Rostedt | 0d5c6e1 | 2012-11-01 20:54:21 -0400 | [diff] [blame] | 2625 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2626 | |
| 2627 | out: |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 2628 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
Steven Rostedt | 5168ae5 | 2010-06-03 09:36:50 -0400 | [diff] [blame] | 2629 | preempt_enable_notrace(); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2630 | } |
| 2631 | |
| 2632 | static struct ftrace_ops trace_ops __initdata = |
| 2633 | { |
| 2634 | .func = function_test_events_call, |
Steven Rostedt | 4740974 | 2012-07-20 11:04:44 -0400 | [diff] [blame] | 2635 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2636 | }; |
| 2637 | |
| 2638 | static __init void event_trace_self_test_with_function(void) |
| 2639 | { |
Steven Rostedt | 17bb615 | 2011-05-23 15:27:46 -0400 | [diff] [blame] | 2640 | int ret; |
| 2641 | ret = register_ftrace_function(&trace_ops); |
| 2642 | if (WARN_ON(ret < 0)) { |
| 2643 | pr_info("Failed to enable function tracer for event tests\n"); |
| 2644 | return; |
| 2645 | } |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 2646 | pr_info("Running tests again, along with the function tracer\n"); |
| 2647 | event_trace_self_tests(); |
| 2648 | unregister_ftrace_function(&trace_ops); |
| 2649 | } |
| 2650 | #else |
| 2651 | static __init void event_trace_self_test_with_function(void) |
| 2652 | { |
| 2653 | } |
| 2654 | #endif |
| 2655 | |
| 2656 | static __init int event_trace_self_tests_init(void) |
| 2657 | { |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 2658 | if (!tracing_selftest_disabled) { |
| 2659 | event_trace_self_tests(); |
| 2660 | event_trace_self_test_with_function(); |
| 2661 | } |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2662 | |
| 2663 | return 0; |
| 2664 | } |
| 2665 | |
Steven Rostedt | 28d20e2 | 2009-04-20 12:12:44 -0400 | [diff] [blame] | 2666 | late_initcall(event_trace_self_tests_init); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 2667 | |
| 2668 | #endif |