Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1 | /* |
| 2 | * event tracer |
| 3 | * |
| 4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> |
| 5 | * |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 6 | * - Added format output of fields of the trace point. |
| 7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. |
| 8 | * |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 9 | */ |
| 10 | |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 11 | #define pr_fmt(fmt) fmt |
| 12 | |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 13 | #include <linux/workqueue.h> |
| 14 | #include <linux/spinlock.h> |
| 15 | #include <linux/kthread.h> |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 16 | #include <linux/tracefs.h> |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 17 | #include <linux/uaccess.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/ctype.h> |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 20 | #include <linux/sort.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 22 | #include <linux/delay.h> |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 23 | |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 24 | #include <trace/events/sched.h> |
| 25 | |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 26 | #include <asm/setup.h> |
| 27 | |
Steven Rostedt | 91729ef9 | 2009-03-02 15:03:01 -0500 | [diff] [blame] | 28 | #include "trace_output.h" |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 29 | |
Steven Rostedt | 4e5292e | 2009-09-12 19:26:21 -0400 | [diff] [blame] | 30 | #undef TRACE_SYSTEM |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 31 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
| 32 | |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 33 | DEFINE_MUTEX(event_mutex); |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 34 | |
Steven Rostedt | a59fd60 | 2009-04-10 13:52:20 -0400 | [diff] [blame] | 35 | LIST_HEAD(ftrace_events); |
Daniel Wagner | 9f61668 | 2015-08-10 14:35:46 +0200 | [diff] [blame] | 36 | static LIST_HEAD(ftrace_generic_fields); |
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 | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 44 | static inline int system_refcount(struct event_subsystem *system) |
| 45 | { |
Rasmus Villemoes | 79ac6ef | 2015-09-09 23:24:01 +0200 | [diff] [blame] | 46 | return system->ref_count; |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 47 | } |
| 48 | |
| 49 | static int system_refcount_inc(struct event_subsystem *system) |
| 50 | { |
Rasmus Villemoes | 79ac6ef | 2015-09-09 23:24:01 +0200 | [diff] [blame] | 51 | return system->ref_count++; |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | static int system_refcount_dec(struct event_subsystem *system) |
| 55 | { |
Rasmus Villemoes | 79ac6ef | 2015-09-09 23:24:01 +0200 | [diff] [blame] | 56 | return --system->ref_count; |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 57 | } |
| 58 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 59 | /* Double loops, do not use break, only goto's work */ |
| 60 | #define do_for_each_event_file(tr, file) \ |
| 61 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ |
| 62 | list_for_each_entry(file, &tr->events, list) |
| 63 | |
| 64 | #define do_for_each_event_file_safe(tr, file) \ |
| 65 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 66 | struct trace_event_file *___n; \ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 67 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
| 68 | |
| 69 | #define while_for_each_event_file() \ |
| 70 | } |
| 71 | |
zhangwei(Jovi) | b3a8c6f | 2013-03-11 15:13:42 +0800 | [diff] [blame] | 72 | static struct list_head * |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 73 | trace_get_fields(struct trace_event_call *event_call) |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 74 | { |
| 75 | if (!event_call->class->get_fields) |
| 76 | return &event_call->class->fields; |
| 77 | return event_call->class->get_fields(event_call); |
| 78 | } |
| 79 | |
zhangwei(Jovi) | b3a8c6f | 2013-03-11 15:13:42 +0800 | [diff] [blame] | 80 | static struct ftrace_event_field * |
| 81 | __find_event_field(struct list_head *head, char *name) |
| 82 | { |
| 83 | struct ftrace_event_field *field; |
| 84 | |
| 85 | list_for_each_entry(field, head, link) { |
| 86 | if (!strcmp(field->name, name)) |
| 87 | return field; |
| 88 | } |
| 89 | |
| 90 | return NULL; |
| 91 | } |
| 92 | |
| 93 | struct ftrace_event_field * |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 94 | trace_find_event_field(struct trace_event_call *call, char *name) |
zhangwei(Jovi) | b3a8c6f | 2013-03-11 15:13:42 +0800 | [diff] [blame] | 95 | { |
| 96 | struct ftrace_event_field *field; |
| 97 | struct list_head *head; |
| 98 | |
Steven Rostedt (Red Hat) | e57cbaf | 2016-03-03 17:18:20 -0500 | [diff] [blame] | 99 | head = trace_get_fields(call); |
| 100 | field = __find_event_field(head, name); |
| 101 | if (field) |
| 102 | return field; |
| 103 | |
Daniel Wagner | 9f61668 | 2015-08-10 14:35:46 +0200 | [diff] [blame] | 104 | field = __find_event_field(&ftrace_generic_fields, name); |
| 105 | if (field) |
| 106 | return field; |
| 107 | |
Steven Rostedt (Red Hat) | e57cbaf | 2016-03-03 17:18:20 -0500 | [diff] [blame] | 108 | return __find_event_field(&ftrace_common_fields, name); |
zhangwei(Jovi) | b3a8c6f | 2013-03-11 15:13:42 +0800 | [diff] [blame] | 109 | } |
| 110 | |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 111 | static int __trace_define_field(struct list_head *head, const char *type, |
| 112 | const char *name, int offset, int size, |
| 113 | int is_signed, int filter_type) |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 114 | { |
| 115 | struct ftrace_event_field *field; |
| 116 | |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 117 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 118 | if (!field) |
Namhyung Kim | aaf6ac0 | 2013-06-07 15:07:48 +0900 | [diff] [blame] | 119 | return -ENOMEM; |
Ingo Molnar | fe9f57f | 2009-03-22 18:41:59 +0100 | [diff] [blame] | 120 | |
Steven Rostedt | 92edca0 | 2013-02-27 20:41:37 -0500 | [diff] [blame] | 121 | field->name = name; |
| 122 | field->type = type; |
Ingo Molnar | fe9f57f | 2009-03-22 18:41:59 +0100 | [diff] [blame] | 123 | |
Li Zefan | 43b51ea | 2009-08-07 10:33:22 +0800 | [diff] [blame] | 124 | if (filter_type == FILTER_OTHER) |
| 125 | field->filter_type = filter_assign_type(type); |
| 126 | else |
| 127 | field->filter_type = filter_type; |
| 128 | |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 129 | field->offset = offset; |
| 130 | field->size = size; |
Tom Zanussi | a118e4d | 2009-04-28 03:04:53 -0500 | [diff] [blame] | 131 | field->is_signed = is_signed; |
Li Zefan | aa38e9f | 2009-08-07 10:33:02 +0800 | [diff] [blame] | 132 | |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 133 | list_add(&field->link, head); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 134 | |
| 135 | return 0; |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 136 | } |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 137 | |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 138 | int trace_define_field(struct trace_event_call *call, const char *type, |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 139 | const char *name, int offset, int size, int is_signed, |
| 140 | int filter_type) |
| 141 | { |
| 142 | struct list_head *head; |
| 143 | |
| 144 | if (WARN_ON(!call->class)) |
| 145 | return 0; |
| 146 | |
| 147 | head = trace_get_fields(call); |
| 148 | return __trace_define_field(head, type, name, offset, size, |
| 149 | is_signed, filter_type); |
| 150 | } |
Steven Rostedt | 17c873e | 2009-04-10 18:12:50 -0400 | [diff] [blame] | 151 | EXPORT_SYMBOL_GPL(trace_define_field); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 152 | |
Daniel Wagner | 9f61668 | 2015-08-10 14:35:46 +0200 | [diff] [blame] | 153 | #define __generic_field(type, item, filter_type) \ |
| 154 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ |
| 155 | #item, 0, 0, is_signed_type(type), \ |
| 156 | filter_type); \ |
| 157 | if (ret) \ |
| 158 | return ret; |
| 159 | |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 160 | #define __common_field(type, item) \ |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 161 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
| 162 | "common_" #item, \ |
| 163 | offsetof(typeof(ent), item), \ |
| 164 | sizeof(ent.item), \ |
| 165 | is_signed_type(type), FILTER_OTHER); \ |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 166 | if (ret) \ |
| 167 | return ret; |
| 168 | |
Daniel Wagner | 9f61668 | 2015-08-10 14:35:46 +0200 | [diff] [blame] | 169 | static int trace_define_generic_fields(void) |
| 170 | { |
| 171 | int ret; |
| 172 | |
Steven Rostedt (Red Hat) | e57cbaf | 2016-03-03 17:18:20 -0500 | [diff] [blame] | 173 | __generic_field(int, CPU, FILTER_CPU); |
| 174 | __generic_field(int, cpu, FILTER_CPU); |
| 175 | __generic_field(char *, COMM, FILTER_COMM); |
| 176 | __generic_field(char *, comm, FILTER_COMM); |
Daniel Wagner | 9f61668 | 2015-08-10 14:35:46 +0200 | [diff] [blame] | 177 | |
| 178 | return ret; |
| 179 | } |
| 180 | |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 181 | static int trace_define_common_fields(void) |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 182 | { |
| 183 | int ret; |
| 184 | struct trace_entry ent; |
| 185 | |
| 186 | __common_field(unsigned short, type); |
| 187 | __common_field(unsigned char, flags); |
| 188 | __common_field(unsigned char, preempt_count); |
| 189 | __common_field(int, pid); |
Li Zefan | e647d6b | 2009-08-19 15:54:32 +0800 | [diff] [blame] | 190 | |
| 191 | return ret; |
| 192 | } |
| 193 | |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 194 | static void trace_destroy_fields(struct trace_event_call *call) |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 195 | { |
| 196 | struct ftrace_event_field *field, *next; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 197 | struct list_head *head; |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 198 | |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 199 | head = trace_get_fields(call); |
| 200 | list_for_each_entry_safe(field, next, head, link) { |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 201 | list_del(&field->link); |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 202 | kmem_cache_free(field_cachep, field); |
Li Zefan | 2df75e4 | 2009-05-06 10:33:04 +0800 | [diff] [blame] | 203 | } |
| 204 | } |
| 205 | |
Alexei Starovoitov | 32bbe00 | 2016-04-06 18:43:28 -0700 | [diff] [blame] | 206 | /* |
| 207 | * run-time version of trace_event_get_offsets_<call>() that returns the last |
| 208 | * accessible offset of trace fields excluding __dynamic_array bytes |
| 209 | */ |
| 210 | int trace_event_get_offsets(struct trace_event_call *call) |
| 211 | { |
| 212 | struct ftrace_event_field *tail; |
| 213 | struct list_head *head; |
| 214 | |
| 215 | head = trace_get_fields(call); |
| 216 | /* |
| 217 | * head->next points to the last field with the largest offset, |
| 218 | * since it was added last by trace_define_field() |
| 219 | */ |
| 220 | tail = list_first_entry(head, struct ftrace_event_field, link); |
| 221 | return tail->offset + tail->size; |
| 222 | } |
| 223 | |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 224 | int trace_event_raw_init(struct trace_event_call *call) |
Li Zefan | 87d9b4e | 2009-12-08 11:14:20 +0800 | [diff] [blame] | 225 | { |
| 226 | int id; |
| 227 | |
Steven Rostedt (Red Hat) | 9023c93 | 2015-05-05 09:39:12 -0400 | [diff] [blame] | 228 | id = register_trace_event(&call->event); |
Li Zefan | 87d9b4e | 2009-12-08 11:14:20 +0800 | [diff] [blame] | 229 | if (!id) |
| 230 | return -ENODEV; |
Li Zefan | 87d9b4e | 2009-12-08 11:14:20 +0800 | [diff] [blame] | 231 | |
| 232 | return 0; |
| 233 | } |
| 234 | EXPORT_SYMBOL_GPL(trace_event_raw_init); |
| 235 | |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 236 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
| 237 | { |
| 238 | struct trace_array *tr = trace_file->tr; |
| 239 | struct trace_array_cpu *data; |
| 240 | struct trace_pid_list *pid_list; |
| 241 | |
| 242 | pid_list = rcu_dereference_sched(tr->filtered_pids); |
| 243 | if (!pid_list) |
| 244 | return false; |
| 245 | |
| 246 | data = this_cpu_ptr(tr->trace_buffer.data); |
| 247 | |
| 248 | return data->ignore_pid; |
| 249 | } |
| 250 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); |
| 251 | |
Steven Rostedt (Red Hat) | 3f795dc | 2015-05-05 13:18:46 -0400 | [diff] [blame] | 252 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
| 253 | struct trace_event_file *trace_file, |
| 254 | unsigned long len) |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 255 | { |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 256 | struct trace_event_call *event_call = trace_file->event_call; |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 257 | |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 258 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
| 259 | trace_event_ignore_this_pid(trace_file)) |
| 260 | return NULL; |
| 261 | |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 262 | local_save_flags(fbuffer->flags); |
| 263 | fbuffer->pc = preempt_count(); |
Steven Rostedt (Red Hat) | e947841 | 2016-06-17 17:40:58 -0400 | [diff] [blame] | 264 | /* |
| 265 | * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables |
| 266 | * preemption (adding one to the preempt_count). Since we are |
| 267 | * interested in the preempt_count at the time the tracepoint was |
| 268 | * hit, we need to subtract one to offset the increment. |
| 269 | */ |
| 270 | if (IS_ENABLED(CONFIG_PREEMPT)) |
| 271 | fbuffer->pc--; |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 272 | fbuffer->trace_file = trace_file; |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 273 | |
| 274 | fbuffer->event = |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 275 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 276 | event_call->event.type, len, |
| 277 | fbuffer->flags, fbuffer->pc); |
| 278 | if (!fbuffer->event) |
| 279 | return NULL; |
| 280 | |
| 281 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); |
| 282 | return fbuffer->entry; |
| 283 | } |
Steven Rostedt (Red Hat) | 3f795dc | 2015-05-05 13:18:46 -0400 | [diff] [blame] | 284 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 285 | |
Steven Rostedt (Red Hat) | 0daa2302 | 2014-12-12 22:27:10 -0500 | [diff] [blame] | 286 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
| 287 | |
Steven Rostedt (Red Hat) | 3f795dc | 2015-05-05 13:18:46 -0400 | [diff] [blame] | 288 | static void output_printk(struct trace_event_buffer *fbuffer) |
Steven Rostedt (Red Hat) | 0daa2302 | 2014-12-12 22:27:10 -0500 | [diff] [blame] | 289 | { |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 290 | struct trace_event_call *event_call; |
Steven Rostedt (Red Hat) | 0daa2302 | 2014-12-12 22:27:10 -0500 | [diff] [blame] | 291 | struct trace_event *event; |
| 292 | unsigned long flags; |
| 293 | struct trace_iterator *iter = tracepoint_print_iter; |
| 294 | |
| 295 | if (!iter) |
| 296 | return; |
| 297 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 298 | event_call = fbuffer->trace_file->event_call; |
Steven Rostedt (Red Hat) | 0daa2302 | 2014-12-12 22:27:10 -0500 | [diff] [blame] | 299 | if (!event_call || !event_call->event.funcs || |
| 300 | !event_call->event.funcs->trace) |
| 301 | return; |
| 302 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 303 | event = &fbuffer->trace_file->event_call->event; |
Steven Rostedt (Red Hat) | 0daa2302 | 2014-12-12 22:27:10 -0500 | [diff] [blame] | 304 | |
| 305 | spin_lock_irqsave(&tracepoint_iter_lock, flags); |
| 306 | trace_seq_init(&iter->seq); |
| 307 | iter->ent = fbuffer->entry; |
| 308 | event_call->event.funcs->trace(iter, 0, event); |
| 309 | trace_seq_putc(&iter->seq, 0); |
| 310 | printk("%s", iter->seq.buffer); |
| 311 | |
| 312 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); |
| 313 | } |
| 314 | |
Steven Rostedt (Red Hat) | 3f795dc | 2015-05-05 13:18:46 -0400 | [diff] [blame] | 315 | void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 316 | { |
Steven Rostedt (Red Hat) | 0daa2302 | 2014-12-12 22:27:10 -0500 | [diff] [blame] | 317 | if (tracepoint_printk) |
| 318 | output_printk(fbuffer); |
| 319 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 320 | event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer, |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 321 | fbuffer->event, fbuffer->entry, |
| 322 | fbuffer->flags, fbuffer->pc); |
| 323 | } |
Steven Rostedt (Red Hat) | 3f795dc | 2015-05-05 13:18:46 -0400 | [diff] [blame] | 324 | EXPORT_SYMBOL_GPL(trace_event_buffer_commit); |
Steven Rostedt | 3fd40d1 | 2012-08-09 22:42:57 -0400 | [diff] [blame] | 325 | |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 326 | int trace_event_reg(struct trace_event_call *call, |
Steven Rostedt (Red Hat) | 9023c93 | 2015-05-05 09:39:12 -0400 | [diff] [blame] | 327 | enum trace_reg type, void *data) |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 328 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 329 | struct trace_event_file *file = data; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 330 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 331 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 332 | switch (type) { |
| 333 | case TRACE_REG_REGISTER: |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 334 | return tracepoint_probe_register(call->tp, |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 335 | call->class->probe, |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 336 | file); |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 337 | case TRACE_REG_UNREGISTER: |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 338 | tracepoint_probe_unregister(call->tp, |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 339 | call->class->probe, |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 340 | file); |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 341 | return 0; |
| 342 | |
| 343 | #ifdef CONFIG_PERF_EVENTS |
| 344 | case TRACE_REG_PERF_REGISTER: |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 345 | return tracepoint_probe_register(call->tp, |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 346 | call->class->perf_probe, |
| 347 | call); |
| 348 | case TRACE_REG_PERF_UNREGISTER: |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 349 | tracepoint_probe_unregister(call->tp, |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 350 | call->class->perf_probe, |
| 351 | call); |
| 352 | return 0; |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 353 | case TRACE_REG_PERF_OPEN: |
| 354 | case TRACE_REG_PERF_CLOSE: |
Jiri Olsa | 489c75c | 2012-02-15 15:51:50 +0100 | [diff] [blame] | 355 | case TRACE_REG_PERF_ADD: |
| 356 | case TRACE_REG_PERF_DEL: |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 357 | return 0; |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 358 | #endif |
| 359 | } |
| 360 | return 0; |
| 361 | } |
Steven Rostedt (Red Hat) | 9023c93 | 2015-05-05 09:39:12 -0400 | [diff] [blame] | 362 | EXPORT_SYMBOL_GPL(trace_event_reg); |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 363 | |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 364 | void trace_event_enable_cmd_record(bool enable) |
| 365 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 366 | struct trace_event_file *file; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 367 | struct trace_array *tr; |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 368 | |
| 369 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 370 | do_for_each_event_file(tr, file) { |
| 371 | |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 372 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 373 | continue; |
| 374 | |
| 375 | if (enable) { |
| 376 | tracing_start_cmdline_record(); |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 377 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 378 | } else { |
| 379 | tracing_stop_cmdline_record(); |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 380 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 381 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 382 | } while_for_each_event_file(); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 383 | mutex_unlock(&event_mutex); |
| 384 | } |
| 385 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 386 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 387 | int enable, int soft_disable) |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 388 | { |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 389 | struct trace_event_call *call = file->event_call; |
Steven Rostedt (Red Hat) | 983f938 | 2015-09-30 09:42:05 -0400 | [diff] [blame] | 390 | struct trace_array *tr = file->tr; |
Steven Rostedt (Red Hat) | 0fc1b09 | 2016-05-03 17:15:43 -0400 | [diff] [blame] | 391 | unsigned long file_flags = file->flags; |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 392 | int ret = 0; |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 393 | int disable; |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 394 | |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 395 | switch (enable) { |
| 396 | case 0: |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 397 | /* |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 398 | * When soft_disable is set and enable is cleared, the sm_ref |
| 399 | * reference counter is decremented. If it reaches 0, we want |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 400 | * to clear the SOFT_DISABLED flag but leave the event in the |
| 401 | * state that it was. That is, if the event was enabled and |
| 402 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED |
| 403 | * is set we do not want the event to be enabled before we |
| 404 | * clear the bit. |
| 405 | * |
| 406 | * When soft_disable is not set but the SOFT_MODE flag is, |
| 407 | * we do nothing. Do not disable the tracepoint, otherwise |
| 408 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. |
| 409 | */ |
| 410 | if (soft_disable) { |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 411 | if (atomic_dec_return(&file->sm_ref) > 0) |
| 412 | break; |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 413 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
| 414 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 415 | } else |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 416 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 417 | |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 418 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
| 419 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
| 420 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 421 | tracing_stop_cmdline_record(); |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 422 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 423 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 424 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 425 | } |
Tom Zanussi | 3baa5e4 | 2013-06-29 00:08:07 -0500 | [diff] [blame] | 426 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 427 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
| 428 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
Tom Zanussi | 3baa5e4 | 2013-06-29 00:08:07 -0500 | [diff] [blame] | 429 | else |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 430 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 431 | break; |
| 432 | case 1: |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 433 | /* |
| 434 | * When soft_disable is set and enable is set, we want to |
| 435 | * register the tracepoint for the event, but leave the event |
| 436 | * as is. That means, if the event was already enabled, we do |
| 437 | * nothing (but set SOFT_MODE). If the event is disabled, we |
| 438 | * set SOFT_DISABLED before enabling the event tracepoint, so |
| 439 | * it still seems to be disabled. |
| 440 | */ |
| 441 | if (!soft_disable) |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 442 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 443 | else { |
| 444 | if (atomic_inc_return(&file->sm_ref) > 1) |
| 445 | break; |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 446 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
Masami Hiramatsu | 1cf4c07 | 2013-05-09 14:44:29 +0900 | [diff] [blame] | 447 | } |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 448 | |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 449 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 450 | |
| 451 | /* Keep the event disabled, when going to SOFT_MODE. */ |
| 452 | if (soft_disable) |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 453 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 454 | |
Steven Rostedt (Red Hat) | 983f938 | 2015-09-30 09:42:05 -0400 | [diff] [blame] | 455 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 456 | tracing_start_cmdline_record(); |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 457 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
Li Zefan | e870e9a | 2010-07-02 11:07:32 +0800 | [diff] [blame] | 458 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 459 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 460 | if (ret) { |
| 461 | tracing_stop_cmdline_record(); |
| 462 | pr_info("event trace: Could not enable event " |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 463 | "%s\n", trace_event_name(call)); |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 464 | break; |
| 465 | } |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 466 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 467 | |
| 468 | /* WAS_ENABLED gets set but never cleared. */ |
| 469 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 470 | } |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 471 | break; |
| 472 | } |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 473 | |
Steven Rostedt (Red Hat) | 0fc1b09 | 2016-05-03 17:15:43 -0400 | [diff] [blame] | 474 | /* Enable or disable use of trace_buffered_event */ |
| 475 | if ((file_flags & EVENT_FILE_FL_SOFT_DISABLED) != |
| 476 | (file->flags & EVENT_FILE_FL_SOFT_DISABLED)) { |
| 477 | if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) |
| 478 | trace_buffered_event_enable(); |
| 479 | else |
| 480 | trace_buffered_event_disable(); |
| 481 | } |
| 482 | |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 483 | return ret; |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 484 | } |
| 485 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 486 | int trace_event_enable_disable(struct trace_event_file *file, |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 487 | int enable, int soft_disable) |
| 488 | { |
| 489 | return __ftrace_event_enable_disable(file, enable, soft_disable); |
| 490 | } |
| 491 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 492 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 493 | int enable) |
| 494 | { |
| 495 | return __ftrace_event_enable_disable(file, enable, 0); |
| 496 | } |
| 497 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 498 | static void ftrace_clear_events(struct trace_array *tr) |
Zhaolei | 0e907c9 | 2009-05-25 18:13:59 +0800 | [diff] [blame] | 499 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 500 | struct trace_event_file *file; |
Zhaolei | 0e907c9 | 2009-05-25 18:13:59 +0800 | [diff] [blame] | 501 | |
| 502 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 503 | list_for_each_entry(file, &tr->events, list) { |
| 504 | ftrace_event_enable_disable(file, 0); |
Zhaolei | 0e907c9 | 2009-05-25 18:13:59 +0800 | [diff] [blame] | 505 | } |
| 506 | mutex_unlock(&event_mutex); |
| 507 | } |
| 508 | |
Steven Rostedt | c37775d | 2016-04-13 16:59:18 -0400 | [diff] [blame] | 509 | static void |
| 510 | event_filter_pid_sched_process_exit(void *data, struct task_struct *task) |
| 511 | { |
| 512 | struct trace_pid_list *pid_list; |
| 513 | struct trace_array *tr = data; |
| 514 | |
| 515 | pid_list = rcu_dereference_sched(tr->filtered_pids); |
Steven Rostedt | 4e267db | 2016-04-14 07:38:13 -0400 | [diff] [blame] | 516 | trace_filter_add_remove_task(pid_list, NULL, task); |
Steven Rostedt | c37775d | 2016-04-13 16:59:18 -0400 | [diff] [blame] | 517 | } |
| 518 | |
| 519 | static void |
| 520 | event_filter_pid_sched_process_fork(void *data, |
| 521 | struct task_struct *self, |
| 522 | struct task_struct *task) |
| 523 | { |
| 524 | struct trace_pid_list *pid_list; |
| 525 | struct trace_array *tr = data; |
| 526 | |
| 527 | pid_list = rcu_dereference_sched(tr->filtered_pids); |
Steven Rostedt | 4e267db | 2016-04-14 07:38:13 -0400 | [diff] [blame] | 528 | trace_filter_add_remove_task(pid_list, self, task); |
Steven Rostedt | c37775d | 2016-04-13 16:59:18 -0400 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | void trace_event_follow_fork(struct trace_array *tr, bool enable) |
| 532 | { |
| 533 | if (enable) { |
| 534 | register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork, |
| 535 | tr, INT_MIN); |
| 536 | register_trace_prio_sched_process_exit(event_filter_pid_sched_process_exit, |
| 537 | tr, INT_MAX); |
| 538 | } else { |
| 539 | unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork, |
| 540 | tr); |
| 541 | unregister_trace_sched_process_exit(event_filter_pid_sched_process_exit, |
| 542 | tr); |
| 543 | } |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 544 | } |
| 545 | |
| 546 | static void |
Linus Torvalds | 22402cd | 2015-11-06 13:30:20 -0800 | [diff] [blame] | 547 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 548 | struct task_struct *prev, struct task_struct *next) |
| 549 | { |
| 550 | struct trace_array *tr = data; |
| 551 | struct trace_pid_list *pid_list; |
| 552 | |
| 553 | pid_list = rcu_dereference_sched(tr->filtered_pids); |
| 554 | |
| 555 | this_cpu_write(tr->trace_buffer.data->ignore_pid, |
Steven Rostedt | 4e267db | 2016-04-14 07:38:13 -0400 | [diff] [blame] | 556 | trace_ignore_this_task(pid_list, prev) && |
| 557 | trace_ignore_this_task(pid_list, next)); |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 558 | } |
| 559 | |
| 560 | static void |
Linus Torvalds | 22402cd | 2015-11-06 13:30:20 -0800 | [diff] [blame] | 561 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 562 | struct task_struct *prev, struct task_struct *next) |
| 563 | { |
| 564 | struct trace_array *tr = data; |
| 565 | struct trace_pid_list *pid_list; |
| 566 | |
| 567 | pid_list = rcu_dereference_sched(tr->filtered_pids); |
| 568 | |
| 569 | this_cpu_write(tr->trace_buffer.data->ignore_pid, |
Steven Rostedt | 4e267db | 2016-04-14 07:38:13 -0400 | [diff] [blame] | 570 | trace_ignore_this_task(pid_list, next)); |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 571 | } |
| 572 | |
| 573 | static void |
| 574 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) |
| 575 | { |
| 576 | struct trace_array *tr = data; |
| 577 | struct trace_pid_list *pid_list; |
| 578 | |
| 579 | /* Nothing to do if we are already tracing */ |
| 580 | if (!this_cpu_read(tr->trace_buffer.data->ignore_pid)) |
| 581 | return; |
| 582 | |
| 583 | pid_list = rcu_dereference_sched(tr->filtered_pids); |
| 584 | |
| 585 | this_cpu_write(tr->trace_buffer.data->ignore_pid, |
Steven Rostedt | 4e267db | 2016-04-14 07:38:13 -0400 | [diff] [blame] | 586 | trace_ignore_this_task(pid_list, task)); |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 587 | } |
| 588 | |
| 589 | static void |
| 590 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) |
| 591 | { |
| 592 | struct trace_array *tr = data; |
| 593 | struct trace_pid_list *pid_list; |
| 594 | |
| 595 | /* Nothing to do if we are not tracing */ |
| 596 | if (this_cpu_read(tr->trace_buffer.data->ignore_pid)) |
| 597 | return; |
| 598 | |
| 599 | pid_list = rcu_dereference_sched(tr->filtered_pids); |
| 600 | |
| 601 | /* Set tracing if current is enabled */ |
| 602 | this_cpu_write(tr->trace_buffer.data->ignore_pid, |
Steven Rostedt | 4e267db | 2016-04-14 07:38:13 -0400 | [diff] [blame] | 603 | trace_ignore_this_task(pid_list, current)); |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 604 | } |
| 605 | |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 606 | static void __ftrace_clear_event_pids(struct trace_array *tr) |
| 607 | { |
| 608 | struct trace_pid_list *pid_list; |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 609 | struct trace_event_file *file; |
| 610 | int cpu; |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 611 | |
| 612 | pid_list = rcu_dereference_protected(tr->filtered_pids, |
| 613 | lockdep_is_held(&event_mutex)); |
| 614 | if (!pid_list) |
| 615 | return; |
| 616 | |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 617 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
| 618 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); |
| 619 | |
| 620 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); |
| 621 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); |
| 622 | |
Steven Rostedt (Red Hat) | 0f72e37 | 2015-12-01 16:08:05 -0500 | [diff] [blame] | 623 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
| 624 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); |
| 625 | |
| 626 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); |
| 627 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); |
| 628 | |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 629 | list_for_each_entry(file, &tr->events, list) { |
| 630 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); |
| 631 | } |
| 632 | |
| 633 | for_each_possible_cpu(cpu) |
| 634 | per_cpu_ptr(tr->trace_buffer.data, cpu)->ignore_pid = false; |
| 635 | |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 636 | rcu_assign_pointer(tr->filtered_pids, NULL); |
| 637 | |
| 638 | /* Wait till all users are no longer using pid filtering */ |
| 639 | synchronize_sched(); |
| 640 | |
Steven Rostedt (Red Hat) | 76c813e | 2016-04-21 11:35:30 -0400 | [diff] [blame] | 641 | trace_free_pid_list(pid_list); |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 642 | } |
| 643 | |
| 644 | static void ftrace_clear_event_pids(struct trace_array *tr) |
| 645 | { |
| 646 | mutex_lock(&event_mutex); |
| 647 | __ftrace_clear_event_pids(tr); |
| 648 | mutex_unlock(&event_mutex); |
| 649 | } |
| 650 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 651 | static void __put_system(struct event_subsystem *system) |
| 652 | { |
| 653 | struct event_filter *filter = system->filter; |
| 654 | |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 655 | WARN_ON_ONCE(system_refcount(system) == 0); |
| 656 | if (system_refcount_dec(system)) |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 657 | return; |
| 658 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 659 | list_del(&system->list); |
| 660 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 661 | if (filter) { |
| 662 | kfree(filter->filter_string); |
| 663 | kfree(filter); |
| 664 | } |
Rasmus Villemoes | 79ac6ef | 2015-09-09 23:24:01 +0200 | [diff] [blame] | 665 | kfree_const(system->name); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 666 | kfree(system); |
| 667 | } |
| 668 | |
| 669 | static void __get_system(struct event_subsystem *system) |
| 670 | { |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 671 | WARN_ON_ONCE(system_refcount(system) == 0); |
| 672 | system_refcount_inc(system); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 673 | } |
| 674 | |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 675 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 676 | { |
| 677 | WARN_ON_ONCE(dir->ref_count == 0); |
| 678 | dir->ref_count++; |
| 679 | __get_system(dir->subsystem); |
| 680 | } |
| 681 | |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 682 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 683 | { |
| 684 | WARN_ON_ONCE(dir->ref_count == 0); |
| 685 | /* If the subsystem is about to be freed, the dir must be too */ |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 686 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 687 | |
| 688 | __put_system(dir->subsystem); |
| 689 | if (!--dir->ref_count) |
| 690 | kfree(dir); |
| 691 | } |
| 692 | |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 693 | static void put_system(struct trace_subsystem_dir *dir) |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 694 | { |
| 695 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 696 | __put_system_dir(dir); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 697 | mutex_unlock(&event_mutex); |
| 698 | } |
| 699 | |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 700 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 701 | { |
| 702 | if (!dir) |
| 703 | return; |
| 704 | |
| 705 | if (!--dir->nr_events) { |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 706 | tracefs_remove_recursive(dir->entry); |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 707 | list_del(&dir->list); |
| 708 | __put_system_dir(dir); |
| 709 | } |
| 710 | } |
| 711 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 712 | static void remove_event_file_dir(struct trace_event_file *file) |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 713 | { |
Oleg Nesterov | bf682c3 | 2013-07-28 20:35:27 +0200 | [diff] [blame] | 714 | struct dentry *dir = file->dir; |
| 715 | struct dentry *child; |
| 716 | |
| 717 | if (dir) { |
| 718 | spin_lock(&dir->d_lock); /* probably unneeded */ |
Al Viro | 946e51f | 2014-10-26 19:19:16 -0400 | [diff] [blame] | 719 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
David Howells | 7682c91 | 2015-03-17 22:26:16 +0000 | [diff] [blame] | 720 | if (d_really_is_positive(child)) /* probably unneeded */ |
| 721 | d_inode(child)->i_private = NULL; |
Oleg Nesterov | bf682c3 | 2013-07-28 20:35:27 +0200 | [diff] [blame] | 722 | } |
| 723 | spin_unlock(&dir->d_lock); |
| 724 | |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 725 | tracefs_remove_recursive(dir); |
Oleg Nesterov | bf682c3 | 2013-07-28 20:35:27 +0200 | [diff] [blame] | 726 | } |
| 727 | |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 728 | list_del(&file->list); |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 729 | remove_subsystem(file->system); |
Oleg Nesterov | 2448e34 | 2014-07-11 21:06:38 +0200 | [diff] [blame] | 730 | free_event_filter(file->filter); |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 731 | kmem_cache_free(file_cachep, file); |
| 732 | } |
| 733 | |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 734 | /* |
| 735 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. |
| 736 | */ |
Steven Rostedt (Red Hat) | 2a6c24a | 2013-07-02 14:48:23 -0400 | [diff] [blame] | 737 | static int |
| 738 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, |
| 739 | const char *sub, const char *event, int set) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 740 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 741 | struct trace_event_file *file; |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 742 | struct trace_event_call *call; |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 743 | const char *name; |
Steven Rostedt | 29f9394 | 2009-05-08 16:06:47 -0400 | [diff] [blame] | 744 | int ret = -EINVAL; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 745 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 746 | list_for_each_entry(file, &tr->events, list) { |
| 747 | |
| 748 | call = file->event_call; |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 749 | name = trace_event_name(call); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 750 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 751 | if (!name || !call->class || !call->class->reg) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 752 | continue; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 753 | |
Steven Rostedt | 9b63776 | 2012-05-10 15:55:43 -0400 | [diff] [blame] | 754 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
| 755 | continue; |
| 756 | |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 757 | if (match && |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 758 | strcmp(match, name) != 0 && |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 759 | strcmp(match, call->class->system) != 0) |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 760 | continue; |
| 761 | |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 762 | if (sub && strcmp(sub, call->class->system) != 0) |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 763 | continue; |
| 764 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 765 | if (event && strcmp(event, name) != 0) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 766 | continue; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 767 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 768 | ftrace_event_enable_disable(file, set); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 769 | |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 770 | ret = 0; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 771 | } |
Steven Rostedt (Red Hat) | 2a6c24a | 2013-07-02 14:48:23 -0400 | [diff] [blame] | 772 | |
| 773 | return ret; |
| 774 | } |
| 775 | |
| 776 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, |
| 777 | const char *sub, const char *event, int set) |
| 778 | { |
| 779 | int ret; |
| 780 | |
| 781 | mutex_lock(&event_mutex); |
| 782 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 783 | mutex_unlock(&event_mutex); |
| 784 | |
Steven Rostedt | b628b3e | 2009-02-27 23:32:58 -0500 | [diff] [blame] | 785 | return ret; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 786 | } |
| 787 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 788 | 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] | 789 | { |
| 790 | char *event = NULL, *sub = NULL, *match; |
Joonsoo Kim | 84fce9d | 2015-04-16 13:44:44 +0900 | [diff] [blame] | 791 | int ret; |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 792 | |
| 793 | /* |
| 794 | * The buf format can be <subsystem>:<event-name> |
| 795 | * *:<event-name> means any event by that name. |
| 796 | * :<event-name> is the same. |
| 797 | * |
| 798 | * <subsystem>:* means all events in that subsystem |
| 799 | * <subsystem>: means the same. |
| 800 | * |
| 801 | * <name> (no ':') means all events in a subsystem with |
| 802 | * the name <name> or any event that matches <name> |
| 803 | */ |
| 804 | |
| 805 | match = strsep(&buf, ":"); |
| 806 | if (buf) { |
| 807 | sub = match; |
| 808 | event = buf; |
| 809 | match = NULL; |
| 810 | |
| 811 | if (!strlen(sub) || strcmp(sub, "*") == 0) |
| 812 | sub = NULL; |
| 813 | if (!strlen(event) || strcmp(event, "*") == 0) |
| 814 | event = NULL; |
| 815 | } |
| 816 | |
Joonsoo Kim | 84fce9d | 2015-04-16 13:44:44 +0900 | [diff] [blame] | 817 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
| 818 | |
| 819 | /* Put back the colon to allow this to be called again */ |
| 820 | if (buf) |
| 821 | *(buf - 1) = ':'; |
| 822 | |
| 823 | return ret; |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 824 | } |
| 825 | |
Steven Rostedt | 4671c79 | 2009-05-08 16:27:41 -0400 | [diff] [blame] | 826 | /** |
| 827 | * trace_set_clr_event - enable or disable an event |
| 828 | * @system: system name to match (NULL for any system) |
| 829 | * @event: event name to match (NULL for all events, within system) |
| 830 | * @set: 1 to enable, 0 to disable |
| 831 | * |
| 832 | * This is a way for other parts of the kernel to enable or disable |
| 833 | * event recording. |
| 834 | * |
| 835 | * Returns 0 on success, -EINVAL if the parameters do not match any |
| 836 | * registered events. |
| 837 | */ |
| 838 | int trace_set_clr_event(const char *system, const char *event, int set) |
| 839 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 840 | struct trace_array *tr = top_trace_array(); |
| 841 | |
Yoshihiro YUNOMAE | dc81e5e | 2014-06-06 07:35:17 +0900 | [diff] [blame] | 842 | if (!tr) |
| 843 | return -ENODEV; |
| 844 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 845 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
Steven Rostedt | 4671c79 | 2009-05-08 16:27:41 -0400 | [diff] [blame] | 846 | } |
Yuanhan Liu | 56355b8 | 2010-11-08 14:05:12 +0800 | [diff] [blame] | 847 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
Steven Rostedt | 4671c79 | 2009-05-08 16:27:41 -0400 | [diff] [blame] | 848 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 849 | /* 128 should be much more than enough */ |
| 850 | #define EVENT_BUF_SIZE 127 |
| 851 | |
| 852 | static ssize_t |
| 853 | ftrace_event_write(struct file *file, const char __user *ubuf, |
| 854 | size_t cnt, loff_t *ppos) |
| 855 | { |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 856 | struct trace_parser parser; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 857 | struct seq_file *m = file->private_data; |
| 858 | struct trace_array *tr = m->private; |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 859 | ssize_t read, ret; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 860 | |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 861 | if (!cnt) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 862 | return 0; |
| 863 | |
Steven Rostedt | 1852fcc | 2009-03-11 14:33:00 -0400 | [diff] [blame] | 864 | ret = tracing_update_buffers(); |
| 865 | if (ret < 0) |
| 866 | return ret; |
| 867 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 868 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 869 | return -ENOMEM; |
| 870 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 871 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 872 | |
Li Zefan | 4ba7978 | 2009-09-22 13:52:20 +0800 | [diff] [blame] | 873 | if (read >= 0 && trace_parser_loaded((&parser))) { |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 874 | int set = 1; |
| 875 | |
| 876 | if (*parser.buffer == '!') |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 877 | set = 0; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 878 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 879 | parser.buffer[parser.idx] = 0; |
| 880 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 881 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 882 | if (ret) |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 883 | goto out_put; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 884 | } |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 885 | |
| 886 | ret = read; |
| 887 | |
jolsa@redhat.com | 4896636 | 2009-09-11 17:29:28 +0200 | [diff] [blame] | 888 | out_put: |
| 889 | trace_parser_put(&parser); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 890 | |
| 891 | return ret; |
| 892 | } |
| 893 | |
| 894 | static void * |
| 895 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 896 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 897 | struct trace_event_file *file = v; |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 898 | struct trace_event_call *call; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 899 | struct trace_array *tr = m->private; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 900 | |
| 901 | (*pos)++; |
| 902 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 903 | list_for_each_entry_continue(file, &tr->events, list) { |
| 904 | call = file->event_call; |
Steven Rostedt | 40e2681 | 2009-03-10 11:32:40 -0400 | [diff] [blame] | 905 | /* |
| 906 | * The ftrace subsystem is for showing formats only. |
| 907 | * They can not be enabled or disabled via the event files. |
| 908 | */ |
Steven Rostedt (Red Hat) | d045437 | 2016-02-24 09:04:24 -0500 | [diff] [blame] | 909 | if (call->class && call->class->reg && |
| 910 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 911 | return file; |
Steven Rostedt | 40e2681 | 2009-03-10 11:32:40 -0400 | [diff] [blame] | 912 | } |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 913 | |
Li Zefan | 30bd39c | 2009-09-18 14:07:05 +0800 | [diff] [blame] | 914 | return NULL; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 915 | } |
| 916 | |
| 917 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 918 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 919 | struct trace_event_file *file; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 920 | struct trace_array *tr = m->private; |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 921 | loff_t l; |
| 922 | |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 923 | mutex_lock(&event_mutex); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 924 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 925 | file = list_entry(&tr->events, struct trace_event_file, list); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 926 | for (l = 0; l <= *pos; ) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 927 | file = t_next(m, file, &l); |
| 928 | if (!file) |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 929 | break; |
| 930 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 931 | return file; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 932 | } |
| 933 | |
| 934 | static void * |
| 935 | s_next(struct seq_file *m, void *v, loff_t *pos) |
| 936 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 937 | struct trace_event_file *file = v; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 938 | struct trace_array *tr = m->private; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 939 | |
| 940 | (*pos)++; |
| 941 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 942 | list_for_each_entry_continue(file, &tr->events, list) { |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 943 | if (file->flags & EVENT_FILE_FL_ENABLED) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 944 | return file; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 945 | } |
| 946 | |
Li Zefan | 30bd39c | 2009-09-18 14:07:05 +0800 | [diff] [blame] | 947 | return NULL; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 948 | } |
| 949 | |
| 950 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 951 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 952 | struct trace_event_file *file; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 953 | struct trace_array *tr = m->private; |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 954 | loff_t l; |
| 955 | |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 956 | mutex_lock(&event_mutex); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 957 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 958 | file = list_entry(&tr->events, struct trace_event_file, list); |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 959 | for (l = 0; l <= *pos; ) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 960 | file = s_next(m, file, &l); |
| 961 | if (!file) |
Li Zefan | e1c7e2a | 2009-06-24 09:52:29 +0800 | [diff] [blame] | 962 | break; |
| 963 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 964 | return file; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 965 | } |
| 966 | |
| 967 | static int t_show(struct seq_file *m, void *v) |
| 968 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 969 | struct trace_event_file *file = v; |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 970 | struct trace_event_call *call = file->event_call; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 971 | |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 972 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
| 973 | seq_printf(m, "%s:", call->class->system); |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 974 | seq_printf(m, "%s\n", trace_event_name(call)); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 975 | |
| 976 | return 0; |
| 977 | } |
| 978 | |
| 979 | static void t_stop(struct seq_file *m, void *p) |
| 980 | { |
Li Zefan | 20c8928 | 2009-05-06 10:33:45 +0800 | [diff] [blame] | 981 | mutex_unlock(&event_mutex); |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 982 | } |
| 983 | |
Steven Rostedt | f4d34a8 | 2016-04-13 16:27:49 -0400 | [diff] [blame] | 984 | static void * |
| 985 | p_next(struct seq_file *m, void *v, loff_t *pos) |
| 986 | { |
| 987 | struct trace_array *tr = m->private; |
| 988 | struct trace_pid_list *pid_list = rcu_dereference_sched(tr->filtered_pids); |
Steven Rostedt | f4d34a8 | 2016-04-13 16:27:49 -0400 | [diff] [blame] | 989 | |
Steven Rostedt (Red Hat) | 5cc8976 | 2016-04-20 15:19:54 -0400 | [diff] [blame] | 990 | return trace_pid_next(pid_list, v, pos); |
Steven Rostedt | f4d34a8 | 2016-04-13 16:27:49 -0400 | [diff] [blame] | 991 | } |
| 992 | |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 993 | static void *p_start(struct seq_file *m, loff_t *pos) |
Steven Rostedt (Red Hat) | fb66228 | 2015-10-26 03:45:22 -0400 | [diff] [blame] | 994 | __acquires(RCU) |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 995 | { |
| 996 | struct trace_pid_list *pid_list; |
| 997 | struct trace_array *tr = m->private; |
| 998 | |
| 999 | /* |
| 1000 | * Grab the mutex, to keep calls to p_next() having the same |
| 1001 | * tr->filtered_pids as p_start() has. |
| 1002 | * If we just passed the tr->filtered_pids around, then RCU would |
| 1003 | * have been enough, but doing that makes things more complex. |
| 1004 | */ |
| 1005 | mutex_lock(&event_mutex); |
| 1006 | rcu_read_lock_sched(); |
| 1007 | |
| 1008 | pid_list = rcu_dereference_sched(tr->filtered_pids); |
| 1009 | |
Steven Rostedt | f4d34a8 | 2016-04-13 16:27:49 -0400 | [diff] [blame] | 1010 | if (!pid_list) |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1011 | return NULL; |
| 1012 | |
Steven Rostedt (Red Hat) | 5cc8976 | 2016-04-20 15:19:54 -0400 | [diff] [blame] | 1013 | return trace_pid_start(pid_list, pos); |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1014 | } |
| 1015 | |
| 1016 | static void p_stop(struct seq_file *m, void *p) |
Steven Rostedt (Red Hat) | fb66228 | 2015-10-26 03:45:22 -0400 | [diff] [blame] | 1017 | __releases(RCU) |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1018 | { |
| 1019 | rcu_read_unlock_sched(); |
| 1020 | mutex_unlock(&event_mutex); |
| 1021 | } |
| 1022 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1023 | static ssize_t |
| 1024 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 1025 | loff_t *ppos) |
| 1026 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 1027 | struct trace_event_file *file; |
Oleg Nesterov | bc6f6b0 | 2013-07-26 19:25:36 +0200 | [diff] [blame] | 1028 | unsigned long flags; |
Tom Zanussi | a439059 | 2013-06-29 00:08:04 -0500 | [diff] [blame] | 1029 | char buf[4] = "0"; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1030 | |
Oleg Nesterov | bc6f6b0 | 2013-07-26 19:25:36 +0200 | [diff] [blame] | 1031 | mutex_lock(&event_mutex); |
| 1032 | file = event_file_data(filp); |
| 1033 | if (likely(file)) |
| 1034 | flags = file->flags; |
| 1035 | mutex_unlock(&event_mutex); |
| 1036 | |
| 1037 | if (!file) |
| 1038 | return -ENODEV; |
| 1039 | |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 1040 | if (flags & EVENT_FILE_FL_ENABLED && |
| 1041 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) |
Tom Zanussi | a439059 | 2013-06-29 00:08:04 -0500 | [diff] [blame] | 1042 | strcpy(buf, "1"); |
| 1043 | |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 1044 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
| 1045 | flags & EVENT_FILE_FL_SOFT_MODE) |
Tom Zanussi | a439059 | 2013-06-29 00:08:04 -0500 | [diff] [blame] | 1046 | strcat(buf, "*"); |
| 1047 | |
| 1048 | strcat(buf, "\n"); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1049 | |
Steven Rostedt (Red Hat) | 417944c | 2013-03-12 13:26:18 -0400 | [diff] [blame] | 1050 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1051 | } |
| 1052 | |
| 1053 | static ssize_t |
| 1054 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 1055 | loff_t *ppos) |
| 1056 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 1057 | struct trace_event_file *file; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1058 | unsigned long val; |
| 1059 | int ret; |
| 1060 | |
Peter Huewe | 22fe9b5 | 2011-06-07 21:58:27 +0200 | [diff] [blame] | 1061 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
| 1062 | if (ret) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1063 | return ret; |
| 1064 | |
Steven Rostedt | 1852fcc | 2009-03-11 14:33:00 -0400 | [diff] [blame] | 1065 | ret = tracing_update_buffers(); |
| 1066 | if (ret < 0) |
| 1067 | return ret; |
| 1068 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1069 | switch (val) { |
| 1070 | case 0: |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1071 | case 1: |
Oleg Nesterov | bc6f6b0 | 2013-07-26 19:25:36 +0200 | [diff] [blame] | 1072 | ret = -ENODEV; |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 1073 | mutex_lock(&event_mutex); |
Oleg Nesterov | bc6f6b0 | 2013-07-26 19:25:36 +0200 | [diff] [blame] | 1074 | file = event_file_data(filp); |
| 1075 | if (likely(file)) |
| 1076 | ret = ftrace_event_enable_disable(file, val); |
Steven Rostedt | 11a241a | 2009-03-02 11:49:04 -0500 | [diff] [blame] | 1077 | mutex_unlock(&event_mutex); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1078 | break; |
| 1079 | |
| 1080 | default: |
| 1081 | return -EINVAL; |
| 1082 | } |
| 1083 | |
| 1084 | *ppos += cnt; |
| 1085 | |
Li Zefan | 3b8e427 | 2009-12-08 11:14:52 +0800 | [diff] [blame] | 1086 | return ret ? ret : cnt; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1087 | } |
| 1088 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1089 | static ssize_t |
| 1090 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 1091 | loff_t *ppos) |
| 1092 | { |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 1093 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 1094 | struct trace_subsystem_dir *dir = filp->private_data; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1095 | struct event_subsystem *system = dir->subsystem; |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 1096 | struct trace_event_call *call; |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 1097 | struct trace_event_file *file; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1098 | struct trace_array *tr = dir->tr; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1099 | char buf[2]; |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 1100 | int set = 0; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1101 | int ret; |
| 1102 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1103 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1104 | list_for_each_entry(file, &tr->events, list) { |
| 1105 | call = file->event_call; |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 1106 | if (!trace_event_name(call) || !call->class || !call->class->reg) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1107 | continue; |
| 1108 | |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 1109 | if (system && strcmp(call->class->system, system->name) != 0) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1110 | continue; |
| 1111 | |
| 1112 | /* |
| 1113 | * We need to find out if all the events are set |
| 1114 | * or if all events or cleared, or if we have |
| 1115 | * a mixture. |
| 1116 | */ |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 1117 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 1118 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1119 | /* |
| 1120 | * If we have a mixture, no need to look further. |
| 1121 | */ |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 1122 | if (set == 3) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1123 | break; |
| 1124 | } |
| 1125 | mutex_unlock(&event_mutex); |
| 1126 | |
Li Zefan | c142b15 | 2009-05-08 10:32:05 +0800 | [diff] [blame] | 1127 | buf[0] = set_to_char[set]; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1128 | buf[1] = '\n'; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1129 | |
| 1130 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); |
| 1131 | |
| 1132 | return ret; |
| 1133 | } |
| 1134 | |
| 1135 | static ssize_t |
| 1136 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 1137 | loff_t *ppos) |
| 1138 | { |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 1139 | struct trace_subsystem_dir *dir = filp->private_data; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1140 | struct event_subsystem *system = dir->subsystem; |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 1141 | const char *name = NULL; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1142 | unsigned long val; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1143 | ssize_t ret; |
| 1144 | |
Peter Huewe | 22fe9b5 | 2011-06-07 21:58:27 +0200 | [diff] [blame] | 1145 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
| 1146 | if (ret) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1147 | return ret; |
| 1148 | |
| 1149 | ret = tracing_update_buffers(); |
| 1150 | if (ret < 0) |
| 1151 | return ret; |
| 1152 | |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 1153 | if (val != 0 && val != 1) |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1154 | return -EINVAL; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1155 | |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 1156 | /* |
| 1157 | * Opening of "enable" adds a ref count to system, |
| 1158 | * so the name is safe to use. |
| 1159 | */ |
| 1160 | if (system) |
| 1161 | name = system->name; |
| 1162 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1163 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1164 | if (ret) |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 1165 | goto out; |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1166 | |
| 1167 | ret = cnt; |
| 1168 | |
Li Zefan | 8f31bfe | 2009-05-08 10:31:42 +0800 | [diff] [blame] | 1169 | out: |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1170 | *ppos += cnt; |
| 1171 | |
| 1172 | return ret; |
| 1173 | } |
| 1174 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1175 | enum { |
| 1176 | FORMAT_HEADER = 1, |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 1177 | FORMAT_FIELD_SEPERATOR = 2, |
| 1178 | FORMAT_PRINTFMT = 3, |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1179 | }; |
| 1180 | |
| 1181 | 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] | 1182 | { |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 1183 | struct trace_event_call *call = event_file_data(m->private); |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 1184 | struct list_head *common_head = &ftrace_common_fields; |
| 1185 | struct list_head *head = trace_get_fields(call); |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 1186 | struct list_head *node = v; |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 1187 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1188 | (*pos)++; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 1189 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1190 | switch ((unsigned long)v) { |
| 1191 | case FORMAT_HEADER: |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 1192 | node = common_head; |
| 1193 | break; |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 1194 | |
| 1195 | case FORMAT_FIELD_SEPERATOR: |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 1196 | node = head; |
| 1197 | break; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 1198 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1199 | case FORMAT_PRINTFMT: |
| 1200 | /* all done */ |
| 1201 | return NULL; |
Lai Jiangshan | 5a65e95 | 2009-12-15 15:39:53 +0800 | [diff] [blame] | 1202 | } |
| 1203 | |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 1204 | node = node->prev; |
| 1205 | if (node == common_head) |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 1206 | return (void *)FORMAT_FIELD_SEPERATOR; |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 1207 | else if (node == head) |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1208 | return (void *)FORMAT_PRINTFMT; |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 1209 | else |
| 1210 | return node; |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1211 | } |
| 1212 | |
| 1213 | static int f_show(struct seq_file *m, void *v) |
| 1214 | { |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 1215 | struct trace_event_call *call = event_file_data(m->private); |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1216 | struct ftrace_event_field *field; |
| 1217 | const char *array_descriptor; |
| 1218 | |
| 1219 | switch ((unsigned long)v) { |
| 1220 | case FORMAT_HEADER: |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 1221 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1222 | seq_printf(m, "ID: %d\n", call->event.type); |
Rasmus Villemoes | fa6f0cc | 2014-11-08 21:42:10 +0100 | [diff] [blame] | 1223 | seq_puts(m, "format:\n"); |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 1224 | return 0; |
| 1225 | |
Li Zefan | 86397dc | 2010-08-17 13:53:06 +0800 | [diff] [blame] | 1226 | case FORMAT_FIELD_SEPERATOR: |
| 1227 | seq_putc(m, '\n'); |
| 1228 | return 0; |
| 1229 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1230 | case FORMAT_PRINTFMT: |
| 1231 | seq_printf(m, "\nprint fmt: %s\n", |
| 1232 | call->print_fmt); |
| 1233 | return 0; |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 1234 | } |
| 1235 | |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 1236 | field = list_entry(v, struct ftrace_event_field, link); |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1237 | /* |
| 1238 | * Smartly shows the array type(except dynamic array). |
| 1239 | * Normal: |
| 1240 | * field:TYPE VAR |
| 1241 | * If TYPE := TYPE[LEN], it is shown: |
| 1242 | * field:TYPE VAR[LEN] |
| 1243 | */ |
| 1244 | array_descriptor = strchr(field->type, '['); |
| 1245 | |
| 1246 | if (!strncmp(field->type, "__data_loc", 10)) |
| 1247 | array_descriptor = NULL; |
| 1248 | |
| 1249 | if (!array_descriptor) |
| 1250 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", |
| 1251 | field->type, field->name, field->offset, |
| 1252 | field->size, !!field->is_signed); |
| 1253 | else |
| 1254 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", |
| 1255 | (int)(array_descriptor - field->type), |
| 1256 | field->type, field->name, |
| 1257 | array_descriptor, field->offset, |
| 1258 | field->size, !!field->is_signed); |
| 1259 | |
| 1260 | return 0; |
| 1261 | } |
| 1262 | |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 1263 | static void *f_start(struct seq_file *m, loff_t *pos) |
| 1264 | { |
| 1265 | void *p = (void *)FORMAT_HEADER; |
| 1266 | loff_t l = 0; |
| 1267 | |
Oleg Nesterov | c5a44a1 | 2013-07-26 19:25:43 +0200 | [diff] [blame] | 1268 | /* ->stop() is called even if ->start() fails */ |
| 1269 | mutex_lock(&event_mutex); |
| 1270 | if (!event_file_data(m->private)) |
| 1271 | return ERR_PTR(-ENODEV); |
| 1272 | |
Oleg Nesterov | 7710b63 | 2013-07-18 20:47:10 +0200 | [diff] [blame] | 1273 | while (l < *pos && p) |
| 1274 | p = f_next(m, p, &l); |
| 1275 | |
| 1276 | return p; |
| 1277 | } |
| 1278 | |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1279 | static void f_stop(struct seq_file *m, void *p) |
| 1280 | { |
Oleg Nesterov | c5a44a1 | 2013-07-26 19:25:43 +0200 | [diff] [blame] | 1281 | mutex_unlock(&event_mutex); |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1282 | } |
| 1283 | |
| 1284 | static const struct seq_operations trace_format_seq_ops = { |
| 1285 | .start = f_start, |
| 1286 | .next = f_next, |
| 1287 | .stop = f_stop, |
| 1288 | .show = f_show, |
| 1289 | }; |
| 1290 | |
| 1291 | static int trace_format_open(struct inode *inode, struct file *file) |
| 1292 | { |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1293 | struct seq_file *m; |
| 1294 | int ret; |
| 1295 | |
| 1296 | ret = seq_open(file, &trace_format_seq_ops); |
| 1297 | if (ret < 0) |
| 1298 | return ret; |
| 1299 | |
| 1300 | m = file->private_data; |
Oleg Nesterov | c5a44a1 | 2013-07-26 19:25:43 +0200 | [diff] [blame] | 1301 | m->private = file; |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1302 | |
| 1303 | return 0; |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 1304 | } |
| 1305 | |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1306 | static ssize_t |
| 1307 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) |
| 1308 | { |
Oleg Nesterov | 1a11126 | 2013-07-26 19:25:32 +0200 | [diff] [blame] | 1309 | int id = (long)event_file_data(filp); |
Oleg Nesterov | cd458ba | 2013-07-18 20:47:12 +0200 | [diff] [blame] | 1310 | char buf[32]; |
| 1311 | int len; |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1312 | |
| 1313 | if (*ppos) |
| 1314 | return 0; |
| 1315 | |
Oleg Nesterov | 1a11126 | 2013-07-26 19:25:32 +0200 | [diff] [blame] | 1316 | if (unlikely(!id)) |
| 1317 | return -ENODEV; |
| 1318 | |
| 1319 | len = sprintf(buf, "%d\n", id); |
| 1320 | |
Oleg Nesterov | cd458ba | 2013-07-18 20:47:12 +0200 | [diff] [blame] | 1321 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1322 | } |
| 1323 | |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1324 | static ssize_t |
| 1325 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 1326 | loff_t *ppos) |
| 1327 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 1328 | struct trace_event_file *file; |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1329 | struct trace_seq *s; |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1330 | int r = -ENODEV; |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1331 | |
| 1332 | if (*ppos) |
| 1333 | return 0; |
| 1334 | |
| 1335 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1336 | |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1337 | if (!s) |
| 1338 | return -ENOMEM; |
| 1339 | |
| 1340 | trace_seq_init(s); |
| 1341 | |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1342 | mutex_lock(&event_mutex); |
Tom Zanussi | f306cc8 | 2013-10-24 08:34:17 -0500 | [diff] [blame] | 1343 | file = event_file_data(filp); |
| 1344 | if (file) |
| 1345 | print_event_filter(file, s); |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1346 | mutex_unlock(&event_mutex); |
| 1347 | |
Tom Zanussi | f306cc8 | 2013-10-24 08:34:17 -0500 | [diff] [blame] | 1348 | if (file) |
Steven Rostedt (Red Hat) | 5ac48378 | 2014-11-14 15:49:41 -0500 | [diff] [blame] | 1349 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
| 1350 | s->buffer, trace_seq_used(s)); |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1351 | |
| 1352 | kfree(s); |
| 1353 | |
| 1354 | return r; |
| 1355 | } |
| 1356 | |
| 1357 | static ssize_t |
| 1358 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 1359 | loff_t *ppos) |
| 1360 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 1361 | struct trace_event_file *file; |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1362 | char *buf; |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1363 | int err = -ENODEV; |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1364 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1365 | if (cnt >= PAGE_SIZE) |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1366 | return -EINVAL; |
| 1367 | |
Al Viro | 70f6cbb | 2015-12-24 00:13:10 -0500 | [diff] [blame] | 1368 | buf = memdup_user_nul(ubuf, cnt); |
| 1369 | if (IS_ERR(buf)) |
| 1370 | return PTR_ERR(buf); |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1371 | |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1372 | mutex_lock(&event_mutex); |
Tom Zanussi | f306cc8 | 2013-10-24 08:34:17 -0500 | [diff] [blame] | 1373 | file = event_file_data(filp); |
| 1374 | if (file) |
| 1375 | err = apply_event_filter(file, buf); |
Oleg Nesterov | e2912b0 | 2013-07-26 19:25:40 +0200 | [diff] [blame] | 1376 | mutex_unlock(&event_mutex); |
| 1377 | |
Al Viro | 70f6cbb | 2015-12-24 00:13:10 -0500 | [diff] [blame] | 1378 | kfree(buf); |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1379 | if (err < 0) |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1380 | return err; |
Tom Zanussi | 0a19e53 | 2009-04-13 03:17:50 -0500 | [diff] [blame] | 1381 | |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1382 | *ppos += cnt; |
| 1383 | |
| 1384 | return cnt; |
| 1385 | } |
| 1386 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1387 | static LIST_HEAD(event_subsystems); |
| 1388 | |
| 1389 | static int subsystem_open(struct inode *inode, struct file *filp) |
| 1390 | { |
| 1391 | struct event_subsystem *system = NULL; |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 1392 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1393 | struct trace_array *tr; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1394 | int ret; |
| 1395 | |
Geyslan G. Bem | d6d3523 | 2013-11-06 16:02:51 -0300 | [diff] [blame] | 1396 | if (tracing_is_disabled()) |
| 1397 | return -ENODEV; |
| 1398 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1399 | /* Make sure the system still exists */ |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 1400 | mutex_lock(&trace_types_lock); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1401 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1402 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
| 1403 | list_for_each_entry(dir, &tr->systems, list) { |
| 1404 | if (dir == inode->i_private) { |
| 1405 | /* Don't open systems with no events */ |
| 1406 | if (dir->nr_events) { |
| 1407 | __get_system_dir(dir); |
| 1408 | system = dir->subsystem; |
| 1409 | } |
| 1410 | goto exit_loop; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1411 | } |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1412 | } |
| 1413 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1414 | exit_loop: |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1415 | mutex_unlock(&event_mutex); |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 1416 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1417 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1418 | if (!system) |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1419 | return -ENODEV; |
| 1420 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1421 | /* Some versions of gcc think dir can be uninitialized here */ |
| 1422 | WARN_ON(!dir); |
| 1423 | |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1424 | /* Still need to increment the ref count of the system */ |
| 1425 | if (trace_array_get(tr) < 0) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1426 | put_system(dir); |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1427 | return -ENODEV; |
| 1428 | } |
| 1429 | |
| 1430 | ret = tracing_open_generic(inode, filp); |
| 1431 | if (ret < 0) { |
| 1432 | trace_array_put(tr); |
| 1433 | put_system(dir); |
| 1434 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1435 | |
| 1436 | return ret; |
| 1437 | } |
| 1438 | |
| 1439 | static int system_tr_open(struct inode *inode, struct file *filp) |
| 1440 | { |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 1441 | struct trace_subsystem_dir *dir; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1442 | struct trace_array *tr = inode->i_private; |
| 1443 | int ret; |
| 1444 | |
Geyslan G. Bem | d6d3523 | 2013-11-06 16:02:51 -0300 | [diff] [blame] | 1445 | if (tracing_is_disabled()) |
| 1446 | return -ENODEV; |
| 1447 | |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1448 | if (trace_array_get(tr) < 0) |
| 1449 | return -ENODEV; |
| 1450 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1451 | /* Make a temporary dir that has no system but points to tr */ |
| 1452 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1453 | if (!dir) { |
| 1454 | trace_array_put(tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1455 | return -ENOMEM; |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1456 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1457 | |
| 1458 | dir->tr = tr; |
| 1459 | |
| 1460 | ret = tracing_open_generic(inode, filp); |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1461 | if (ret < 0) { |
| 1462 | trace_array_put(tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1463 | kfree(dir); |
Geyslan G. Bem | d6d3523 | 2013-11-06 16:02:51 -0300 | [diff] [blame] | 1464 | return ret; |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1465 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1466 | |
| 1467 | filp->private_data = dir; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1468 | |
Geyslan G. Bem | d6d3523 | 2013-11-06 16:02:51 -0300 | [diff] [blame] | 1469 | return 0; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1470 | } |
| 1471 | |
| 1472 | static int subsystem_release(struct inode *inode, struct file *file) |
| 1473 | { |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 1474 | struct trace_subsystem_dir *dir = file->private_data; |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1475 | |
Steven Rostedt (Red Hat) | 8e2e2fa | 2013-07-02 15:30:53 -0400 | [diff] [blame] | 1476 | trace_array_put(dir->tr); |
| 1477 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1478 | /* |
| 1479 | * If dir->subsystem is NULL, then this is a temporary |
| 1480 | * descriptor that was made for a trace_array to enable |
| 1481 | * all subsystems. |
| 1482 | */ |
| 1483 | if (dir->subsystem) |
| 1484 | put_system(dir); |
| 1485 | else |
| 1486 | kfree(dir); |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1487 | |
| 1488 | return 0; |
| 1489 | } |
| 1490 | |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1491 | static ssize_t |
| 1492 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, |
| 1493 | loff_t *ppos) |
| 1494 | { |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 1495 | struct trace_subsystem_dir *dir = filp->private_data; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1496 | struct event_subsystem *system = dir->subsystem; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1497 | struct trace_seq *s; |
| 1498 | int r; |
| 1499 | |
| 1500 | if (*ppos) |
| 1501 | return 0; |
| 1502 | |
| 1503 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 1504 | if (!s) |
| 1505 | return -ENOMEM; |
| 1506 | |
| 1507 | trace_seq_init(s); |
| 1508 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1509 | print_subsystem_event_filter(system, s); |
Steven Rostedt (Red Hat) | 5ac48378 | 2014-11-14 15:49:41 -0500 | [diff] [blame] | 1510 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
| 1511 | s->buffer, trace_seq_used(s)); |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1512 | |
| 1513 | kfree(s); |
| 1514 | |
| 1515 | return r; |
| 1516 | } |
| 1517 | |
| 1518 | static ssize_t |
| 1519 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, |
| 1520 | loff_t *ppos) |
| 1521 | { |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 1522 | struct trace_subsystem_dir *dir = filp->private_data; |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1523 | char *buf; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1524 | int err; |
| 1525 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1526 | if (cnt >= PAGE_SIZE) |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1527 | return -EINVAL; |
| 1528 | |
Al Viro | 70f6cbb | 2015-12-24 00:13:10 -0500 | [diff] [blame] | 1529 | buf = memdup_user_nul(ubuf, cnt); |
| 1530 | if (IS_ERR(buf)) |
| 1531 | return PTR_ERR(buf); |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1532 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1533 | err = apply_subsystem_event_filter(dir, buf); |
Al Viro | 70f6cbb | 2015-12-24 00:13:10 -0500 | [diff] [blame] | 1534 | kfree(buf); |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1535 | if (err < 0) |
Li Zefan | 44e9c8b | 2009-04-11 15:55:28 +0800 | [diff] [blame] | 1536 | return err; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1537 | |
| 1538 | *ppos += cnt; |
| 1539 | |
| 1540 | return cnt; |
| 1541 | } |
| 1542 | |
Steven Rostedt | d1b182a | 2009-04-15 16:53:47 -0400 | [diff] [blame] | 1543 | static ssize_t |
| 1544 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) |
| 1545 | { |
| 1546 | int (*func)(struct trace_seq *s) = filp->private_data; |
| 1547 | struct trace_seq *s; |
| 1548 | int r; |
| 1549 | |
| 1550 | if (*ppos) |
| 1551 | return 0; |
| 1552 | |
| 1553 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 1554 | if (!s) |
| 1555 | return -ENOMEM; |
| 1556 | |
| 1557 | trace_seq_init(s); |
| 1558 | |
| 1559 | func(s); |
Steven Rostedt (Red Hat) | 5ac48378 | 2014-11-14 15:49:41 -0500 | [diff] [blame] | 1560 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
| 1561 | s->buffer, trace_seq_used(s)); |
Steven Rostedt | d1b182a | 2009-04-15 16:53:47 -0400 | [diff] [blame] | 1562 | |
| 1563 | kfree(s); |
| 1564 | |
| 1565 | return r; |
| 1566 | } |
| 1567 | |
Steven Rostedt (Red Hat) | 8ca532a | 2015-10-21 15:27:36 -0400 | [diff] [blame] | 1568 | static void ignore_task_cpu(void *data) |
| 1569 | { |
| 1570 | struct trace_array *tr = data; |
| 1571 | struct trace_pid_list *pid_list; |
| 1572 | |
| 1573 | /* |
| 1574 | * This function is called by on_each_cpu() while the |
| 1575 | * event_mutex is held. |
| 1576 | */ |
| 1577 | pid_list = rcu_dereference_protected(tr->filtered_pids, |
| 1578 | mutex_is_locked(&event_mutex)); |
| 1579 | |
| 1580 | this_cpu_write(tr->trace_buffer.data->ignore_pid, |
Steven Rostedt | 4e267db | 2016-04-14 07:38:13 -0400 | [diff] [blame] | 1581 | trace_ignore_this_task(pid_list, current)); |
Steven Rostedt (Red Hat) | 8ca532a | 2015-10-21 15:27:36 -0400 | [diff] [blame] | 1582 | } |
| 1583 | |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1584 | static ssize_t |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 1585 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1586 | size_t cnt, loff_t *ppos) |
| 1587 | { |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 1588 | struct seq_file *m = filp->private_data; |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1589 | struct trace_array *tr = m->private; |
| 1590 | struct trace_pid_list *filtered_pids = NULL; |
Steven Rostedt | f4d34a8 | 2016-04-13 16:27:49 -0400 | [diff] [blame] | 1591 | struct trace_pid_list *pid_list; |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 1592 | struct trace_event_file *file; |
Steven Rostedt (Red Hat) | 76c813e | 2016-04-21 11:35:30 -0400 | [diff] [blame] | 1593 | ssize_t ret; |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1594 | |
| 1595 | if (!cnt) |
| 1596 | return 0; |
| 1597 | |
| 1598 | ret = tracing_update_buffers(); |
| 1599 | if (ret < 0) |
| 1600 | return ret; |
| 1601 | |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1602 | mutex_lock(&event_mutex); |
Steven Rostedt (Red Hat) | 76c813e | 2016-04-21 11:35:30 -0400 | [diff] [blame] | 1603 | |
Steven Rostedt | f4d34a8 | 2016-04-13 16:27:49 -0400 | [diff] [blame] | 1604 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, |
| 1605 | lockdep_is_held(&event_mutex)); |
| 1606 | |
Steven Rostedt (Red Hat) | 76c813e | 2016-04-21 11:35:30 -0400 | [diff] [blame] | 1607 | ret = trace_pid_write(filtered_pids, &pid_list, ubuf, cnt); |
| 1608 | if (ret < 0) |
Steven Rostedt | f4d34a8 | 2016-04-13 16:27:49 -0400 | [diff] [blame] | 1609 | goto out; |
Steven Rostedt | f4d34a8 | 2016-04-13 16:27:49 -0400 | [diff] [blame] | 1610 | |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1611 | rcu_assign_pointer(tr->filtered_pids, pid_list); |
| 1612 | |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 1613 | list_for_each_entry(file, &tr->events, list) { |
| 1614 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); |
| 1615 | } |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1616 | |
| 1617 | if (filtered_pids) { |
| 1618 | synchronize_sched(); |
Steven Rostedt (Red Hat) | 76c813e | 2016-04-21 11:35:30 -0400 | [diff] [blame] | 1619 | trace_free_pid_list(filtered_pids); |
| 1620 | } else if (pid_list) { |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 1621 | /* |
| 1622 | * Register a probe that is called before all other probes |
| 1623 | * to set ignore_pid if next or prev do not match. |
| 1624 | * Register a probe this is called after all other probes |
| 1625 | * to only keep ignore_pid set if next pid matches. |
| 1626 | */ |
| 1627 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, |
| 1628 | tr, INT_MAX); |
| 1629 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, |
| 1630 | tr, 0); |
| 1631 | |
| 1632 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, |
| 1633 | tr, INT_MAX); |
| 1634 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, |
| 1635 | tr, 0); |
Steven Rostedt (Red Hat) | 0f72e37 | 2015-12-01 16:08:05 -0500 | [diff] [blame] | 1636 | |
| 1637 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, |
| 1638 | tr, INT_MAX); |
| 1639 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, |
| 1640 | tr, 0); |
| 1641 | |
| 1642 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, |
| 1643 | tr, INT_MAX); |
| 1644 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, |
| 1645 | tr, 0); |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1646 | } |
| 1647 | |
Steven Rostedt (Red Hat) | 799fd44 | 2015-11-02 13:08:26 -0500 | [diff] [blame] | 1648 | /* |
| 1649 | * Ignoring of pids is done at task switch. But we have to |
| 1650 | * check for those tasks that are currently running. |
| 1651 | * Always do this in case a pid was appended or removed. |
| 1652 | */ |
| 1653 | on_each_cpu(ignore_task_cpu, tr, 1); |
| 1654 | |
Steven Rostedt | f4d34a8 | 2016-04-13 16:27:49 -0400 | [diff] [blame] | 1655 | out: |
Steven Rostedt (Red Hat) | 3fdaf80 | 2015-09-25 12:58:44 -0400 | [diff] [blame] | 1656 | mutex_unlock(&event_mutex); |
| 1657 | |
Steven Rostedt (Red Hat) | 76c813e | 2016-04-21 11:35:30 -0400 | [diff] [blame] | 1658 | if (ret > 0) |
| 1659 | *ppos += ret; |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1660 | |
| 1661 | return ret; |
| 1662 | } |
| 1663 | |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1664 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
| 1665 | static int ftrace_event_set_open(struct inode *inode, struct file *file); |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1666 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
Alexander Z Lam | f77d09a | 2013-07-18 11:18:44 -0700 | [diff] [blame] | 1667 | static int ftrace_event_release(struct inode *inode, struct file *file); |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1668 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1669 | static const struct seq_operations show_event_seq_ops = { |
| 1670 | .start = t_start, |
| 1671 | .next = t_next, |
| 1672 | .show = t_show, |
| 1673 | .stop = t_stop, |
| 1674 | }; |
| 1675 | |
| 1676 | static const struct seq_operations show_set_event_seq_ops = { |
| 1677 | .start = s_start, |
| 1678 | .next = s_next, |
| 1679 | .show = t_show, |
| 1680 | .stop = t_stop, |
| 1681 | }; |
| 1682 | |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1683 | static const struct seq_operations show_set_pid_seq_ops = { |
| 1684 | .start = p_start, |
| 1685 | .next = p_next, |
Steven Rostedt (Red Hat) | 5cc8976 | 2016-04-20 15:19:54 -0400 | [diff] [blame] | 1686 | .show = trace_pid_show, |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1687 | .stop = p_stop, |
| 1688 | }; |
| 1689 | |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 1690 | static const struct file_operations ftrace_avail_fops = { |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1691 | .open = ftrace_event_avail_open, |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 1692 | .read = seq_read, |
| 1693 | .llseek = seq_lseek, |
| 1694 | .release = seq_release, |
| 1695 | }; |
| 1696 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1697 | static const struct file_operations ftrace_set_event_fops = { |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1698 | .open = ftrace_event_set_open, |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1699 | .read = seq_read, |
| 1700 | .write = ftrace_event_write, |
| 1701 | .llseek = seq_lseek, |
Alexander Z Lam | f77d09a | 2013-07-18 11:18:44 -0700 | [diff] [blame] | 1702 | .release = ftrace_event_release, |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 1703 | }; |
| 1704 | |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1705 | static const struct file_operations ftrace_set_event_pid_fops = { |
| 1706 | .open = ftrace_event_set_pid_open, |
| 1707 | .read = seq_read, |
| 1708 | .write = ftrace_event_pid_write, |
| 1709 | .llseek = seq_lseek, |
| 1710 | .release = ftrace_event_release, |
| 1711 | }; |
| 1712 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1713 | static const struct file_operations ftrace_enable_fops = { |
Oleg Nesterov | bf682c3 | 2013-07-28 20:35:27 +0200 | [diff] [blame] | 1714 | .open = tracing_open_generic, |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1715 | .read = event_enable_read, |
| 1716 | .write = event_enable_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1717 | .llseek = default_llseek, |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1718 | }; |
| 1719 | |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 1720 | static const struct file_operations ftrace_event_format_fops = { |
Steven Rostedt | 2a37a3d | 2010-06-03 15:21:34 -0400 | [diff] [blame] | 1721 | .open = trace_format_open, |
| 1722 | .read = seq_read, |
| 1723 | .llseek = seq_lseek, |
| 1724 | .release = seq_release, |
Steven Rostedt | 981d081 | 2009-03-02 13:53:59 -0500 | [diff] [blame] | 1725 | }; |
| 1726 | |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1727 | static const struct file_operations ftrace_event_id_fops = { |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1728 | .read = event_id_read, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1729 | .llseek = default_llseek, |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1730 | }; |
| 1731 | |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1732 | static const struct file_operations ftrace_event_filter_fops = { |
| 1733 | .open = tracing_open_generic, |
| 1734 | .read = event_filter_read, |
| 1735 | .write = event_filter_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1736 | .llseek = default_llseek, |
Tom Zanussi | 7ce7e42 | 2009-03-22 03:31:04 -0500 | [diff] [blame] | 1737 | }; |
| 1738 | |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1739 | static const struct file_operations ftrace_subsystem_filter_fops = { |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1740 | .open = subsystem_open, |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1741 | .read = subsystem_filter_read, |
| 1742 | .write = subsystem_filter_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1743 | .llseek = default_llseek, |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1744 | .release = subsystem_release, |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1745 | }; |
| 1746 | |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1747 | static const struct file_operations ftrace_system_enable_fops = { |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 1748 | .open = subsystem_open, |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1749 | .read = system_enable_read, |
| 1750 | .write = system_enable_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1751 | .llseek = default_llseek, |
Steven Rostedt | 40ee4df | 2011-07-05 14:32:51 -0400 | [diff] [blame] | 1752 | .release = subsystem_release, |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1753 | }; |
| 1754 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1755 | static const struct file_operations ftrace_tr_enable_fops = { |
| 1756 | .open = system_tr_open, |
| 1757 | .read = system_enable_read, |
| 1758 | .write = system_enable_write, |
| 1759 | .llseek = default_llseek, |
| 1760 | .release = subsystem_release, |
| 1761 | }; |
| 1762 | |
Steven Rostedt | d1b182a | 2009-04-15 16:53:47 -0400 | [diff] [blame] | 1763 | static const struct file_operations ftrace_show_header_fops = { |
| 1764 | .open = tracing_open_generic, |
| 1765 | .read = show_header, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1766 | .llseek = default_llseek, |
Steven Rostedt | d1b182a | 2009-04-15 16:53:47 -0400 | [diff] [blame] | 1767 | }; |
| 1768 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1769 | static int |
| 1770 | ftrace_event_open(struct inode *inode, struct file *file, |
| 1771 | const struct seq_operations *seq_ops) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1772 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1773 | struct seq_file *m; |
| 1774 | int ret; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1775 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1776 | ret = seq_open(file, seq_ops); |
| 1777 | if (ret < 0) |
| 1778 | return ret; |
| 1779 | m = file->private_data; |
| 1780 | /* copy tr over to seq ops */ |
| 1781 | m->private = inode->i_private; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1782 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1783 | return ret; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1784 | } |
| 1785 | |
Alexander Z Lam | f77d09a | 2013-07-18 11:18:44 -0700 | [diff] [blame] | 1786 | static int ftrace_event_release(struct inode *inode, struct file *file) |
| 1787 | { |
| 1788 | struct trace_array *tr = inode->i_private; |
| 1789 | |
| 1790 | trace_array_put(tr); |
| 1791 | |
| 1792 | return seq_release(inode, file); |
| 1793 | } |
| 1794 | |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1795 | static int |
| 1796 | ftrace_event_avail_open(struct inode *inode, struct file *file) |
| 1797 | { |
| 1798 | const struct seq_operations *seq_ops = &show_event_seq_ops; |
| 1799 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1800 | return ftrace_event_open(inode, file, seq_ops); |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1801 | } |
| 1802 | |
| 1803 | static int |
| 1804 | ftrace_event_set_open(struct inode *inode, struct file *file) |
| 1805 | { |
| 1806 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1807 | struct trace_array *tr = inode->i_private; |
Alexander Z Lam | f77d09a | 2013-07-18 11:18:44 -0700 | [diff] [blame] | 1808 | int ret; |
| 1809 | |
| 1810 | if (trace_array_get(tr) < 0) |
| 1811 | return -ENODEV; |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1812 | |
| 1813 | if ((file->f_mode & FMODE_WRITE) && |
| 1814 | (file->f_flags & O_TRUNC)) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1815 | ftrace_clear_events(tr); |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1816 | |
Alexander Z Lam | f77d09a | 2013-07-18 11:18:44 -0700 | [diff] [blame] | 1817 | ret = ftrace_event_open(inode, file, seq_ops); |
| 1818 | if (ret < 0) |
| 1819 | trace_array_put(tr); |
| 1820 | return ret; |
Steven Rostedt | 15075ca | 2012-05-03 14:57:28 -0400 | [diff] [blame] | 1821 | } |
| 1822 | |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 1823 | static int |
| 1824 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) |
| 1825 | { |
| 1826 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; |
| 1827 | struct trace_array *tr = inode->i_private; |
| 1828 | int ret; |
| 1829 | |
| 1830 | if (trace_array_get(tr) < 0) |
| 1831 | return -ENODEV; |
| 1832 | |
| 1833 | if ((file->f_mode & FMODE_WRITE) && |
| 1834 | (file->f_flags & O_TRUNC)) |
| 1835 | ftrace_clear_event_pids(tr); |
| 1836 | |
| 1837 | ret = ftrace_event_open(inode, file, seq_ops); |
| 1838 | if (ret < 0) |
| 1839 | trace_array_put(tr); |
| 1840 | return ret; |
| 1841 | } |
| 1842 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1843 | static struct event_subsystem * |
| 1844 | create_new_subsystem(const char *name) |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1845 | { |
| 1846 | struct event_subsystem *system; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1847 | |
| 1848 | /* need to create new entry */ |
| 1849 | system = kmalloc(sizeof(*system), GFP_KERNEL); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1850 | if (!system) |
| 1851 | return NULL; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1852 | |
Steven Rostedt | e9dbfae | 2011-07-05 11:36:06 -0400 | [diff] [blame] | 1853 | system->ref_count = 1; |
Steven Rostedt | 6e94a78 | 2013-06-27 10:58:31 -0400 | [diff] [blame] | 1854 | |
| 1855 | /* Only allocate if dynamic (kprobes and modules) */ |
Rasmus Villemoes | 79ac6ef | 2015-09-09 23:24:01 +0200 | [diff] [blame] | 1856 | system->name = kstrdup_const(name, GFP_KERNEL); |
| 1857 | if (!system->name) |
| 1858 | goto out_free; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1859 | |
Tom Zanussi | 30e673b | 2009-04-28 03:04:47 -0500 | [diff] [blame] | 1860 | system->filter = NULL; |
Tom Zanussi | cfb180f | 2009-03-22 03:31:17 -0500 | [diff] [blame] | 1861 | |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1862 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1863 | if (!system->filter) |
| 1864 | goto out_free; |
| 1865 | |
| 1866 | list_add(&system->list, &event_subsystems); |
| 1867 | |
| 1868 | return system; |
| 1869 | |
| 1870 | out_free: |
Rasmus Villemoes | 79ac6ef | 2015-09-09 23:24:01 +0200 | [diff] [blame] | 1871 | kfree_const(system->name); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1872 | kfree(system); |
| 1873 | return NULL; |
| 1874 | } |
| 1875 | |
| 1876 | static struct dentry * |
| 1877 | event_subsystem_dir(struct trace_array *tr, const char *name, |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 1878 | struct trace_event_file *file, struct dentry *parent) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1879 | { |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 1880 | struct trace_subsystem_dir *dir; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1881 | struct event_subsystem *system; |
| 1882 | struct dentry *entry; |
| 1883 | |
| 1884 | /* First see if we did not already create this dir */ |
| 1885 | list_for_each_entry(dir, &tr->systems, list) { |
| 1886 | system = dir->subsystem; |
| 1887 | if (strcmp(system->name, name) == 0) { |
| 1888 | dir->nr_events++; |
| 1889 | file->system = dir; |
| 1890 | return dir->entry; |
| 1891 | } |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1892 | } |
| 1893 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1894 | /* Now see if the system itself exists. */ |
| 1895 | list_for_each_entry(system, &event_subsystems, list) { |
| 1896 | if (strcmp(system->name, name) == 0) |
| 1897 | break; |
| 1898 | } |
| 1899 | /* Reset system variable when not found */ |
| 1900 | if (&system->list == &event_subsystems) |
| 1901 | system = NULL; |
| 1902 | |
| 1903 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
| 1904 | if (!dir) |
| 1905 | goto out_fail; |
| 1906 | |
| 1907 | if (!system) { |
| 1908 | system = create_new_subsystem(name); |
| 1909 | if (!system) |
| 1910 | goto out_free; |
| 1911 | } else |
| 1912 | __get_system(system); |
| 1913 | |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 1914 | dir->entry = tracefs_create_dir(name, parent); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1915 | if (!dir->entry) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 1916 | pr_warn("Failed to create system directory %s\n", name); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1917 | __put_system(system); |
| 1918 | goto out_free; |
| 1919 | } |
| 1920 | |
| 1921 | dir->tr = tr; |
| 1922 | dir->ref_count = 1; |
| 1923 | dir->nr_events = 1; |
| 1924 | dir->subsystem = system; |
| 1925 | file->system = dir; |
| 1926 | |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 1927 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
Tom Zanussi | e1112b4 | 2009-03-31 00:48:49 -0500 | [diff] [blame] | 1928 | &ftrace_subsystem_filter_fops); |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1929 | if (!entry) { |
| 1930 | kfree(system->filter); |
| 1931 | system->filter = NULL; |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 1932 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); |
Tom Zanussi | 8b37256 | 2009-04-28 03:04:59 -0500 | [diff] [blame] | 1933 | } |
Tom Zanussi | e1112b4 | 2009-03-31 00:48:49 -0500 | [diff] [blame] | 1934 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1935 | trace_create_file("enable", 0644, dir->entry, dir, |
Frederic Weisbecker | f3f3f00 | 2009-09-24 15:27:41 +0200 | [diff] [blame] | 1936 | &ftrace_system_enable_fops); |
Steven Rostedt | 8ae79a1 | 2009-05-06 22:52:15 -0400 | [diff] [blame] | 1937 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1938 | list_add(&dir->list, &tr->systems); |
| 1939 | |
| 1940 | return dir->entry; |
| 1941 | |
| 1942 | out_free: |
| 1943 | kfree(dir); |
| 1944 | out_fail: |
| 1945 | /* Only print this message if failed on memory allocation */ |
| 1946 | if (!dir || !system) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 1947 | pr_warn("No memory to create event subsystem %s\n", name); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1948 | return NULL; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1949 | } |
| 1950 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1951 | static int |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 1952 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1953 | { |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 1954 | struct trace_event_call *call = file->event_call; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1955 | struct trace_array *tr = file->tr; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 1956 | struct list_head *head; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1957 | struct dentry *d_events; |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 1958 | const char *name; |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 1959 | int ret; |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1960 | |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1961 | /* |
| 1962 | * If the trace point header did not define TRACE_SYSTEM |
| 1963 | * then the system would be called "TRACE_SYSTEM". |
| 1964 | */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1965 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
| 1966 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); |
| 1967 | if (!d_events) |
| 1968 | return -ENOMEM; |
| 1969 | } else |
| 1970 | d_events = parent; |
Steven Rostedt | 6ecc2d1 | 2009-02-27 21:33:02 -0500 | [diff] [blame] | 1971 | |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 1972 | name = trace_event_name(call); |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 1973 | file->dir = tracefs_create_dir(name, d_events); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1974 | if (!file->dir) { |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 1975 | pr_warn("Could not create tracefs '%s' directory\n", name); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1976 | return -1; |
| 1977 | } |
| 1978 | |
Steven Rostedt | 9b63776 | 2012-05-10 15:55:43 -0400 | [diff] [blame] | 1979 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 1980 | trace_create_file("enable", 0644, file->dir, file, |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 1981 | &ftrace_enable_fops); |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 1982 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1983 | #ifdef CONFIG_PERF_EVENTS |
Steven Rostedt | a1d0ce8 | 2010-06-08 11:22:06 -0400 | [diff] [blame] | 1984 | if (call->event.type && call->class->reg) |
Oleg Nesterov | 1a11126 | 2013-07-26 19:25:32 +0200 | [diff] [blame] | 1985 | trace_create_file("id", 0444, file->dir, |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 1986 | (void *)(long)call->event.type, |
| 1987 | &ftrace_event_id_fops); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1988 | #endif |
Peter Zijlstra | 23725ae | 2009-03-19 20:26:13 +0100 | [diff] [blame] | 1989 | |
Li Zefan | c9d932c | 2010-05-24 16:24:28 +0800 | [diff] [blame] | 1990 | /* |
| 1991 | * Other events may have the same class. Only update |
| 1992 | * the fields if they are not already defined. |
| 1993 | */ |
| 1994 | head = trace_get_fields(call); |
| 1995 | if (list_empty(head)) { |
| 1996 | ret = call->class->define_fields(call); |
| 1997 | if (ret < 0) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 1998 | pr_warn("Could not initialize trace point events/%s\n", |
| 1999 | name); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2000 | return -1; |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 2001 | } |
| 2002 | } |
Tom Zanussi | f306cc8 | 2013-10-24 08:34:17 -0500 | [diff] [blame] | 2003 | trace_create_file("filter", 0644, file->dir, file, |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 2004 | &ftrace_event_filter_fops); |
Tom Zanussi | cf027f6 | 2009-03-22 03:30:39 -0500 | [diff] [blame] | 2005 | |
Chunyu Hu | 854145e | 2016-05-03 19:34:34 +0800 | [diff] [blame] | 2006 | /* |
| 2007 | * Only event directories that can be enabled should have |
| 2008 | * triggers. |
| 2009 | */ |
| 2010 | if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
| 2011 | trace_create_file("trigger", 0644, file->dir, file, |
| 2012 | &event_trigger_fops); |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 2013 | |
Tom Zanussi | 7ef224d | 2016-03-03 12:54:42 -0600 | [diff] [blame] | 2014 | #ifdef CONFIG_HIST_TRIGGERS |
| 2015 | trace_create_file("hist", 0444, file->dir, file, |
| 2016 | &event_hist_fops); |
| 2017 | #endif |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2018 | trace_create_file("format", 0444, file->dir, call, |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 2019 | &ftrace_event_format_fops); |
Steven Rostedt | fd99498 | 2009-02-28 02:41:25 -0500 | [diff] [blame] | 2020 | |
Steven Rostedt | 1473e44 | 2009-02-24 14:15:08 -0500 | [diff] [blame] | 2021 | return 0; |
| 2022 | } |
| 2023 | |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2024 | static void remove_event_from_tracers(struct trace_event_call *call) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2025 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2026 | struct trace_event_file *file; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2027 | struct trace_array *tr; |
| 2028 | |
| 2029 | do_for_each_event_file_safe(tr, file) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2030 | if (file->event_call != call) |
| 2031 | continue; |
| 2032 | |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 2033 | remove_event_file_dir(file); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2034 | /* |
| 2035 | * The do_for_each_event_file_safe() is |
| 2036 | * a double loop. After finding the call for this |
| 2037 | * trace_array, we use break to jump to the next |
| 2038 | * trace_array. |
| 2039 | */ |
| 2040 | break; |
| 2041 | } while_for_each_event_file(); |
| 2042 | } |
| 2043 | |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2044 | static void event_remove(struct trace_event_call *call) |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2045 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2046 | struct trace_array *tr; |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2047 | struct trace_event_file *file; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2048 | |
| 2049 | do_for_each_event_file(tr, file) { |
| 2050 | if (file->event_call != call) |
| 2051 | continue; |
| 2052 | ftrace_event_enable_disable(file, 0); |
| 2053 | /* |
| 2054 | * The do_for_each_event_file() is |
| 2055 | * a double loop. After finding the call for this |
| 2056 | * trace_array, we use break to jump to the next |
| 2057 | * trace_array. |
| 2058 | */ |
| 2059 | break; |
| 2060 | } while_for_each_event_file(); |
| 2061 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2062 | if (call->event.funcs) |
Steven Rostedt (Red Hat) | 9023c93 | 2015-05-05 09:39:12 -0400 | [diff] [blame] | 2063 | __unregister_trace_event(&call->event); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2064 | remove_event_from_tracers(call); |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2065 | list_del(&call->list); |
| 2066 | } |
| 2067 | |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2068 | static int event_init(struct trace_event_call *call) |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2069 | { |
| 2070 | int ret = 0; |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 2071 | const char *name; |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2072 | |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 2073 | name = trace_event_name(call); |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 2074 | if (WARN_ON(!name)) |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2075 | return -EINVAL; |
| 2076 | |
| 2077 | if (call->class->raw_init) { |
| 2078 | ret = call->class->raw_init(call); |
| 2079 | if (ret < 0 && ret != -ENOSYS) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2080 | pr_warn("Could not initialize trace events/%s\n", name); |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2081 | } |
| 2082 | |
| 2083 | return ret; |
| 2084 | } |
| 2085 | |
Li Zefan | 67ead0a | 2010-05-24 16:25:13 +0800 | [diff] [blame] | 2086 | static int |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2087 | __register_event(struct trace_event_call *call, struct module *mod) |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2088 | { |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2089 | int ret; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2090 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2091 | ret = event_init(call); |
| 2092 | if (ret < 0) |
| 2093 | return ret; |
Steven Rostedt | 701970b | 2009-04-24 23:11:22 -0400 | [diff] [blame] | 2094 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2095 | list_add(&call->list, &ftrace_events); |
Li Zefan | 67ead0a | 2010-05-24 16:25:13 +0800 | [diff] [blame] | 2096 | call->mod = mod; |
Masami Hiramatsu | 88f70d7 | 2009-09-25 11:20:54 -0700 | [diff] [blame] | 2097 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2098 | return 0; |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2099 | } |
| 2100 | |
Steven Rostedt (Red Hat) | 0c564a5 | 2015-03-24 17:58:09 -0400 | [diff] [blame] | 2101 | static char *enum_replace(char *ptr, struct trace_enum_map *map, int len) |
| 2102 | { |
| 2103 | int rlen; |
| 2104 | int elen; |
| 2105 | |
| 2106 | /* Find the length of the enum value as a string */ |
| 2107 | elen = snprintf(ptr, 0, "%ld", map->enum_value); |
| 2108 | /* Make sure there's enough room to replace the string with the value */ |
| 2109 | if (len < elen) |
| 2110 | return NULL; |
| 2111 | |
| 2112 | snprintf(ptr, elen + 1, "%ld", map->enum_value); |
| 2113 | |
| 2114 | /* Get the rest of the string of ptr */ |
| 2115 | rlen = strlen(ptr + len); |
| 2116 | memmove(ptr + elen, ptr + len, rlen); |
| 2117 | /* Make sure we end the new string */ |
| 2118 | ptr[elen + rlen] = 0; |
| 2119 | |
| 2120 | return ptr + elen; |
| 2121 | } |
| 2122 | |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2123 | static void update_event_printk(struct trace_event_call *call, |
Steven Rostedt (Red Hat) | 0c564a5 | 2015-03-24 17:58:09 -0400 | [diff] [blame] | 2124 | struct trace_enum_map *map) |
| 2125 | { |
| 2126 | char *ptr; |
| 2127 | int quote = 0; |
| 2128 | int len = strlen(map->enum_string); |
| 2129 | |
| 2130 | for (ptr = call->print_fmt; *ptr; ptr++) { |
| 2131 | if (*ptr == '\\') { |
| 2132 | ptr++; |
| 2133 | /* paranoid */ |
| 2134 | if (!*ptr) |
| 2135 | break; |
| 2136 | continue; |
| 2137 | } |
| 2138 | if (*ptr == '"') { |
| 2139 | quote ^= 1; |
| 2140 | continue; |
| 2141 | } |
| 2142 | if (quote) |
| 2143 | continue; |
| 2144 | if (isdigit(*ptr)) { |
| 2145 | /* skip numbers */ |
| 2146 | do { |
| 2147 | ptr++; |
| 2148 | /* Check for alpha chars like ULL */ |
| 2149 | } while (isalnum(*ptr)); |
Steven Rostedt (Red Hat) | 3193899 | 2015-04-17 10:27:57 -0400 | [diff] [blame] | 2150 | if (!*ptr) |
| 2151 | break; |
Steven Rostedt (Red Hat) | 0c564a5 | 2015-03-24 17:58:09 -0400 | [diff] [blame] | 2152 | /* |
| 2153 | * A number must have some kind of delimiter after |
| 2154 | * it, and we can ignore that too. |
| 2155 | */ |
| 2156 | continue; |
| 2157 | } |
| 2158 | if (isalpha(*ptr) || *ptr == '_') { |
| 2159 | if (strncmp(map->enum_string, ptr, len) == 0 && |
| 2160 | !isalnum(ptr[len]) && ptr[len] != '_') { |
| 2161 | ptr = enum_replace(ptr, map, len); |
| 2162 | /* Hmm, enum string smaller than value */ |
| 2163 | if (WARN_ON_ONCE(!ptr)) |
| 2164 | return; |
| 2165 | /* |
| 2166 | * No need to decrement here, as enum_replace() |
| 2167 | * returns the pointer to the character passed |
| 2168 | * the enum, and two enums can not be placed |
| 2169 | * back to back without something in between. |
| 2170 | * We can skip that something in between. |
| 2171 | */ |
| 2172 | continue; |
| 2173 | } |
| 2174 | skip_more: |
| 2175 | do { |
| 2176 | ptr++; |
| 2177 | } while (isalnum(*ptr) || *ptr == '_'); |
Steven Rostedt (Red Hat) | 3193899 | 2015-04-17 10:27:57 -0400 | [diff] [blame] | 2178 | if (!*ptr) |
| 2179 | break; |
Steven Rostedt (Red Hat) | 0c564a5 | 2015-03-24 17:58:09 -0400 | [diff] [blame] | 2180 | /* |
| 2181 | * If what comes after this variable is a '.' or |
| 2182 | * '->' then we can continue to ignore that string. |
| 2183 | */ |
| 2184 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { |
| 2185 | ptr += *ptr == '.' ? 1 : 2; |
Steven Rostedt (Red Hat) | 3193899 | 2015-04-17 10:27:57 -0400 | [diff] [blame] | 2186 | if (!*ptr) |
| 2187 | break; |
Steven Rostedt (Red Hat) | 0c564a5 | 2015-03-24 17:58:09 -0400 | [diff] [blame] | 2188 | goto skip_more; |
| 2189 | } |
| 2190 | /* |
| 2191 | * Once again, we can skip the delimiter that came |
| 2192 | * after the string. |
| 2193 | */ |
| 2194 | continue; |
| 2195 | } |
| 2196 | } |
| 2197 | } |
| 2198 | |
| 2199 | void trace_event_enum_update(struct trace_enum_map **map, int len) |
| 2200 | { |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2201 | struct trace_event_call *call, *p; |
Steven Rostedt (Red Hat) | 0c564a5 | 2015-03-24 17:58:09 -0400 | [diff] [blame] | 2202 | const char *last_system = NULL; |
Steven Rostedt (VMware) | 9a50ea0 | 2018-01-18 15:53:10 -0500 | [diff] [blame] | 2203 | bool first = false; |
Steven Rostedt (Red Hat) | 0c564a5 | 2015-03-24 17:58:09 -0400 | [diff] [blame] | 2204 | int last_i; |
| 2205 | int i; |
| 2206 | |
| 2207 | down_write(&trace_event_sem); |
| 2208 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
| 2209 | /* events are usually grouped together with systems */ |
| 2210 | if (!last_system || call->class->system != last_system) { |
Steven Rostedt (VMware) | 9a50ea0 | 2018-01-18 15:53:10 -0500 | [diff] [blame] | 2211 | first = true; |
Steven Rostedt (Red Hat) | 0c564a5 | 2015-03-24 17:58:09 -0400 | [diff] [blame] | 2212 | last_i = 0; |
| 2213 | last_system = call->class->system; |
| 2214 | } |
| 2215 | |
Steven Rostedt (VMware) | 9a50ea0 | 2018-01-18 15:53:10 -0500 | [diff] [blame] | 2216 | /* |
| 2217 | * Since calls are grouped by systems, the likelyhood that the |
| 2218 | * next call in the iteration belongs to the same system as the |
| 2219 | * previous call is high. As an optimization, we skip seaching |
| 2220 | * for a map[] that matches the call's system if the last call |
| 2221 | * was from the same system. That's what last_i is for. If the |
| 2222 | * call has the same system as the previous call, then last_i |
| 2223 | * will be the index of the first map[] that has a matching |
| 2224 | * system. |
| 2225 | */ |
Steven Rostedt (Red Hat) | 0c564a5 | 2015-03-24 17:58:09 -0400 | [diff] [blame] | 2226 | for (i = last_i; i < len; i++) { |
| 2227 | if (call->class->system == map[i]->system) { |
| 2228 | /* Save the first system if need be */ |
Steven Rostedt (VMware) | 9a50ea0 | 2018-01-18 15:53:10 -0500 | [diff] [blame] | 2229 | if (first) { |
Steven Rostedt (Red Hat) | 0c564a5 | 2015-03-24 17:58:09 -0400 | [diff] [blame] | 2230 | last_i = i; |
Steven Rostedt (VMware) | 9a50ea0 | 2018-01-18 15:53:10 -0500 | [diff] [blame] | 2231 | first = false; |
| 2232 | } |
Steven Rostedt (Red Hat) | 0c564a5 | 2015-03-24 17:58:09 -0400 | [diff] [blame] | 2233 | update_event_printk(call, map[i]); |
| 2234 | } |
| 2235 | } |
| 2236 | } |
| 2237 | up_write(&trace_event_sem); |
| 2238 | } |
| 2239 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2240 | static struct trace_event_file * |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2241 | trace_create_new_event(struct trace_event_call *call, |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 2242 | struct trace_array *tr) |
| 2243 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2244 | struct trace_event_file *file; |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 2245 | |
| 2246 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); |
| 2247 | if (!file) |
| 2248 | return NULL; |
| 2249 | |
| 2250 | file->event_call = call; |
| 2251 | file->tr = tr; |
| 2252 | atomic_set(&file->sm_ref, 0); |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 2253 | atomic_set(&file->tm_ref, 0); |
| 2254 | INIT_LIST_HEAD(&file->triggers); |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 2255 | list_add(&file->list, &tr->events); |
| 2256 | |
| 2257 | return file; |
| 2258 | } |
| 2259 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2260 | /* Add an event to a trace directory */ |
| 2261 | static int |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2262 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2263 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2264 | struct trace_event_file *file; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2265 | |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 2266 | file = trace_create_new_event(call, tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2267 | if (!file) |
| 2268 | return -ENOMEM; |
| 2269 | |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 2270 | return event_create_dir(tr->event_dir, file); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2271 | } |
| 2272 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2273 | /* |
| 2274 | * Just create a decriptor for early init. A descriptor is required |
| 2275 | * for enabling events at boot. We want to enable events before |
| 2276 | * the filesystem is initialized. |
| 2277 | */ |
| 2278 | static __init int |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2279 | __trace_early_add_new_event(struct trace_event_call *call, |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2280 | struct trace_array *tr) |
| 2281 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2282 | struct trace_event_file *file; |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2283 | |
Steven Rostedt (Red Hat) | da511bf | 2013-05-09 15:00:07 -0400 | [diff] [blame] | 2284 | file = trace_create_new_event(call, tr); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2285 | if (!file) |
| 2286 | return -ENOMEM; |
| 2287 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2288 | return 0; |
| 2289 | } |
| 2290 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2291 | struct ftrace_module_file_ops; |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2292 | static void __add_event_to_tracers(struct trace_event_call *call); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2293 | |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2294 | /* Add an additional event_call dynamically */ |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2295 | int trace_add_event_call(struct trace_event_call *call) |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2296 | { |
| 2297 | int ret; |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 2298 | mutex_lock(&trace_types_lock); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2299 | mutex_lock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2300 | |
| 2301 | ret = __register_event(call, NULL); |
| 2302 | if (ret >= 0) |
Oleg Nesterov | 779c5e3 | 2013-07-31 19:31:32 +0200 | [diff] [blame] | 2303 | __add_event_to_tracers(call); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2304 | |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2305 | mutex_unlock(&event_mutex); |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 2306 | mutex_unlock(&trace_types_lock); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2307 | return ret; |
| 2308 | } |
Steven Rostedt | 701970b | 2009-04-24 23:11:22 -0400 | [diff] [blame] | 2309 | |
Masami Hiramatsu | 4fead8e | 2009-09-14 16:49:12 -0400 | [diff] [blame] | 2310 | /* |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 2311 | * Must be called under locking of trace_types_lock, event_mutex and |
| 2312 | * trace_event_sem. |
Masami Hiramatsu | 4fead8e | 2009-09-14 16:49:12 -0400 | [diff] [blame] | 2313 | */ |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2314 | static void __trace_remove_event_call(struct trace_event_call *call) |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2315 | { |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 2316 | event_remove(call); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2317 | trace_destroy_fields(call); |
Oleg Nesterov | 5737574 | 2014-07-15 20:48:16 +0200 | [diff] [blame] | 2318 | free_event_filter(call->filter); |
| 2319 | call->filter = NULL; |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2320 | } |
| 2321 | |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2322 | static int probe_remove_event_call(struct trace_event_call *call) |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2323 | { |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 2324 | struct trace_array *tr; |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2325 | struct trace_event_file *file; |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 2326 | |
| 2327 | #ifdef CONFIG_PERF_EVENTS |
| 2328 | if (call->perf_refcount) |
| 2329 | return -EBUSY; |
| 2330 | #endif |
| 2331 | do_for_each_event_file(tr, file) { |
| 2332 | if (file->event_call != call) |
| 2333 | continue; |
| 2334 | /* |
| 2335 | * We can't rely on ftrace_event_enable_disable(enable => 0) |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 2336 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 2337 | * TRACE_REG_UNREGISTER. |
| 2338 | */ |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 2339 | if (file->flags & EVENT_FILE_FL_ENABLED) |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 2340 | return -EBUSY; |
Steven Rostedt (Red Hat) | 2ba6403 | 2013-07-31 13:16:22 -0400 | [diff] [blame] | 2341 | /* |
| 2342 | * The do_for_each_event_file_safe() is |
| 2343 | * a double loop. After finding the call for this |
| 2344 | * trace_array, we use break to jump to the next |
| 2345 | * trace_array. |
| 2346 | */ |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 2347 | break; |
| 2348 | } while_for_each_event_file(); |
| 2349 | |
| 2350 | __trace_remove_event_call(call); |
| 2351 | |
| 2352 | return 0; |
| 2353 | } |
| 2354 | |
| 2355 | /* Remove an event_call */ |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2356 | int trace_remove_event_call(struct trace_event_call *call) |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 2357 | { |
| 2358 | int ret; |
| 2359 | |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 2360 | mutex_lock(&trace_types_lock); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2361 | mutex_lock(&event_mutex); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2362 | down_write(&trace_event_sem); |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 2363 | ret = probe_remove_event_call(call); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2364 | up_write(&trace_event_sem); |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2365 | mutex_unlock(&event_mutex); |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 2366 | mutex_unlock(&trace_types_lock); |
Oleg Nesterov | 2816c55 | 2013-07-29 19:50:33 +0200 | [diff] [blame] | 2367 | |
| 2368 | return ret; |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2369 | } |
| 2370 | |
| 2371 | #define for_each_event(event, start, end) \ |
| 2372 | for (event = start; \ |
| 2373 | (unsigned long)event < (unsigned long)end; \ |
| 2374 | event++) |
| 2375 | |
| 2376 | #ifdef CONFIG_MODULES |
| 2377 | |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2378 | static void trace_module_add_events(struct module *mod) |
| 2379 | { |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2380 | struct trace_event_call **call, **start, **end; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2381 | |
Steven Rostedt (Red Hat) | 45ab2813 | 2014-02-26 13:37:38 -0500 | [diff] [blame] | 2382 | if (!mod->num_trace_events) |
| 2383 | return; |
| 2384 | |
| 2385 | /* Don't add infrastructure for mods without tracepoints */ |
| 2386 | if (trace_module_has_bad_taint(mod)) { |
| 2387 | pr_err("%s: module has bad taint, not creating trace events\n", |
| 2388 | mod->name); |
| 2389 | return; |
| 2390 | } |
| 2391 | |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2392 | start = mod->trace_events; |
| 2393 | end = mod->trace_events + mod->num_trace_events; |
| 2394 | |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2395 | for_each_event(call, start, end) { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2396 | __register_event(*call, mod); |
Oleg Nesterov | 779c5e3 | 2013-07-31 19:31:32 +0200 | [diff] [blame] | 2397 | __add_event_to_tracers(*call); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2398 | } |
| 2399 | } |
| 2400 | |
| 2401 | static void trace_module_remove_events(struct module *mod) |
| 2402 | { |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2403 | struct trace_event_call *call, *p; |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 2404 | bool clear_trace = false; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2405 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2406 | down_write(&trace_event_sem); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2407 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
| 2408 | if (call->mod == mod) { |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 2409 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
| 2410 | clear_trace = true; |
Masami Hiramatsu | bd1a5c8 | 2009-08-13 16:34:53 -0400 | [diff] [blame] | 2411 | __trace_remove_event_call(call); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2412 | } |
| 2413 | } |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2414 | up_write(&trace_event_sem); |
Steven Rostedt | 9456f0f | 2009-05-06 21:54:09 -0400 | [diff] [blame] | 2415 | |
| 2416 | /* |
| 2417 | * 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] | 2418 | * registered any events that were used. The only worry is if |
| 2419 | * a new module gets loaded, and takes on the same id as the events |
| 2420 | * of this module. When printing out the buffer, traced events left |
| 2421 | * over from this module may be passed to the new module events and |
| 2422 | * unexpected results may occur. |
Steven Rostedt | 9456f0f | 2009-05-06 21:54:09 -0400 | [diff] [blame] | 2423 | */ |
Steven Rostedt (Red Hat) | 575380d | 2013-03-04 23:05:12 -0500 | [diff] [blame] | 2424 | if (clear_trace) |
Steven Rostedt (Red Hat) | 873c642 | 2013-03-04 23:26:06 -0500 | [diff] [blame] | 2425 | tracing_reset_all_online_cpus(); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2426 | } |
| 2427 | |
Steven Rostedt | 61f919a | 2009-04-14 18:22:32 -0400 | [diff] [blame] | 2428 | static int trace_module_notify(struct notifier_block *self, |
| 2429 | unsigned long val, void *data) |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2430 | { |
| 2431 | struct module *mod = data; |
| 2432 | |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 2433 | mutex_lock(&trace_types_lock); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2434 | mutex_lock(&event_mutex); |
| 2435 | switch (val) { |
| 2436 | case MODULE_STATE_COMING: |
| 2437 | trace_module_add_events(mod); |
| 2438 | break; |
| 2439 | case MODULE_STATE_GOING: |
| 2440 | trace_module_remove_events(mod); |
| 2441 | break; |
| 2442 | } |
| 2443 | mutex_unlock(&event_mutex); |
Alexander Z Lam | a822741 | 2013-07-01 19:37:54 -0700 | [diff] [blame] | 2444 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2445 | |
| 2446 | return 0; |
| 2447 | } |
Steven Rostedt (Red Hat) | 315326c | 2013-03-02 17:37:14 -0500 | [diff] [blame] | 2448 | |
Oleg Nesterov | 836d481 | 2013-07-31 19:31:37 +0200 | [diff] [blame] | 2449 | static struct notifier_block trace_module_nb = { |
| 2450 | .notifier_call = trace_module_notify, |
Steven Rostedt (Red Hat) | 3673b8e | 2015-03-25 15:44:21 -0400 | [diff] [blame] | 2451 | .priority = 1, /* higher than trace.c module notify */ |
Oleg Nesterov | 836d481 | 2013-07-31 19:31:37 +0200 | [diff] [blame] | 2452 | }; |
Steven Rostedt | 61f919a | 2009-04-14 18:22:32 -0400 | [diff] [blame] | 2453 | #endif /* CONFIG_MODULES */ |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 2454 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2455 | /* Create a new event directory structure for a trace directory. */ |
| 2456 | static void |
| 2457 | __trace_add_event_dirs(struct trace_array *tr) |
| 2458 | { |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2459 | struct trace_event_call *call; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2460 | int ret; |
| 2461 | |
| 2462 | list_for_each_entry(call, &ftrace_events, list) { |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 2463 | ret = __trace_add_new_event(call, tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2464 | if (ret < 0) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2465 | pr_warn("Could not create directory for event %s\n", |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 2466 | trace_event_name(call)); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2467 | } |
| 2468 | } |
| 2469 | |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2470 | struct trace_event_file * |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2471 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
| 2472 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2473 | struct trace_event_file *file; |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2474 | struct trace_event_call *call; |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 2475 | const char *name; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2476 | |
| 2477 | list_for_each_entry(file, &tr->events, list) { |
| 2478 | |
| 2479 | call = file->event_call; |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 2480 | name = trace_event_name(call); |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2481 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 2482 | if (!name || !call->class || !call->class->reg) |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2483 | continue; |
| 2484 | |
| 2485 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
| 2486 | continue; |
| 2487 | |
Mathieu Desnoyers | de7b297 | 2014-04-08 17:26:21 -0400 | [diff] [blame] | 2488 | if (strcmp(event, name) == 0 && |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2489 | strcmp(system, call->class->system) == 0) |
| 2490 | return file; |
| 2491 | } |
| 2492 | return NULL; |
| 2493 | } |
| 2494 | |
Steven Rostedt (Red Hat) | 2875a08 | 2013-12-20 23:23:05 -0500 | [diff] [blame] | 2495 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2496 | |
| 2497 | /* Avoid typos */ |
| 2498 | #define ENABLE_EVENT_STR "enable_event" |
| 2499 | #define DISABLE_EVENT_STR "disable_event" |
| 2500 | |
| 2501 | struct event_probe_data { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2502 | struct trace_event_file *file; |
Steven Rostedt (Red Hat) | 2875a08 | 2013-12-20 23:23:05 -0500 | [diff] [blame] | 2503 | unsigned long count; |
| 2504 | int ref; |
| 2505 | bool enable; |
| 2506 | }; |
| 2507 | |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2508 | static void |
| 2509 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) |
| 2510 | { |
| 2511 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 2512 | struct event_probe_data *data = *pdata; |
| 2513 | |
| 2514 | if (!data) |
| 2515 | return; |
| 2516 | |
| 2517 | if (data->enable) |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 2518 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2519 | else |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 2520 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2521 | } |
| 2522 | |
| 2523 | static void |
| 2524 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) |
| 2525 | { |
| 2526 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 2527 | struct event_probe_data *data = *pdata; |
| 2528 | |
| 2529 | if (!data) |
| 2530 | return; |
| 2531 | |
| 2532 | if (!data->count) |
| 2533 | return; |
| 2534 | |
| 2535 | /* Skip if the event is in a state we want to switch to */ |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 2536 | if (data->enable == !(data->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2537 | return; |
| 2538 | |
| 2539 | if (data->count != -1) |
| 2540 | (data->count)--; |
| 2541 | |
| 2542 | event_enable_probe(ip, parent_ip, _data); |
| 2543 | } |
| 2544 | |
| 2545 | static int |
| 2546 | event_enable_print(struct seq_file *m, unsigned long ip, |
| 2547 | struct ftrace_probe_ops *ops, void *_data) |
| 2548 | { |
| 2549 | struct event_probe_data *data = _data; |
| 2550 | |
| 2551 | seq_printf(m, "%ps:", (void *)ip); |
| 2552 | |
| 2553 | seq_printf(m, "%s:%s:%s", |
| 2554 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, |
| 2555 | data->file->event_call->class->system, |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 2556 | trace_event_name(data->file->event_call)); |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2557 | |
| 2558 | if (data->count == -1) |
Rasmus Villemoes | fa6f0cc | 2014-11-08 21:42:10 +0100 | [diff] [blame] | 2559 | seq_puts(m, ":unlimited\n"); |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2560 | else |
| 2561 | seq_printf(m, ":count=%ld\n", data->count); |
| 2562 | |
| 2563 | return 0; |
| 2564 | } |
| 2565 | |
| 2566 | static int |
| 2567 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, |
| 2568 | void **_data) |
| 2569 | { |
| 2570 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 2571 | struct event_probe_data *data = *pdata; |
| 2572 | |
| 2573 | data->ref++; |
| 2574 | return 0; |
| 2575 | } |
| 2576 | |
| 2577 | static void |
| 2578 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, |
| 2579 | void **_data) |
| 2580 | { |
| 2581 | struct event_probe_data **pdata = (struct event_probe_data **)_data; |
| 2582 | struct event_probe_data *data = *pdata; |
| 2583 | |
| 2584 | if (WARN_ON_ONCE(data->ref <= 0)) |
| 2585 | return; |
| 2586 | |
| 2587 | data->ref--; |
| 2588 | if (!data->ref) { |
| 2589 | /* Remove the SOFT_MODE flag */ |
| 2590 | __ftrace_event_enable_disable(data->file, 0, 1); |
| 2591 | module_put(data->file->event_call->mod); |
| 2592 | kfree(data); |
| 2593 | } |
| 2594 | *pdata = NULL; |
| 2595 | } |
| 2596 | |
| 2597 | static struct ftrace_probe_ops event_enable_probe_ops = { |
| 2598 | .func = event_enable_probe, |
| 2599 | .print = event_enable_print, |
| 2600 | .init = event_enable_init, |
| 2601 | .free = event_enable_free, |
| 2602 | }; |
| 2603 | |
| 2604 | static struct ftrace_probe_ops event_enable_count_probe_ops = { |
| 2605 | .func = event_enable_count_probe, |
| 2606 | .print = event_enable_print, |
| 2607 | .init = event_enable_init, |
| 2608 | .free = event_enable_free, |
| 2609 | }; |
| 2610 | |
| 2611 | static struct ftrace_probe_ops event_disable_probe_ops = { |
| 2612 | .func = event_enable_probe, |
| 2613 | .print = event_enable_print, |
| 2614 | .init = event_enable_init, |
| 2615 | .free = event_enable_free, |
| 2616 | }; |
| 2617 | |
| 2618 | static struct ftrace_probe_ops event_disable_count_probe_ops = { |
| 2619 | .func = event_enable_count_probe, |
| 2620 | .print = event_enable_print, |
| 2621 | .init = event_enable_init, |
| 2622 | .free = event_enable_free, |
| 2623 | }; |
| 2624 | |
| 2625 | static int |
| 2626 | event_enable_func(struct ftrace_hash *hash, |
| 2627 | char *glob, char *cmd, char *param, int enabled) |
| 2628 | { |
| 2629 | struct trace_array *tr = top_trace_array(); |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2630 | struct trace_event_file *file; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2631 | struct ftrace_probe_ops *ops; |
| 2632 | struct event_probe_data *data; |
| 2633 | const char *system; |
| 2634 | const char *event; |
| 2635 | char *number; |
| 2636 | bool enable; |
| 2637 | int ret; |
| 2638 | |
Yoshihiro YUNOMAE | dc81e5e | 2014-06-06 07:35:17 +0900 | [diff] [blame] | 2639 | if (!tr) |
| 2640 | return -ENODEV; |
| 2641 | |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2642 | /* hash funcs only work with set_ftrace_filter */ |
Harsh Prateek Bora | 8092e80 | 2013-05-24 12:52:17 +0530 | [diff] [blame] | 2643 | if (!enabled || !param) |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2644 | return -EINVAL; |
| 2645 | |
| 2646 | system = strsep(¶m, ":"); |
| 2647 | if (!param) |
| 2648 | return -EINVAL; |
| 2649 | |
| 2650 | event = strsep(¶m, ":"); |
| 2651 | |
| 2652 | mutex_lock(&event_mutex); |
| 2653 | |
| 2654 | ret = -EINVAL; |
| 2655 | file = find_event_file(tr, system, event); |
| 2656 | if (!file) |
| 2657 | goto out; |
| 2658 | |
| 2659 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; |
| 2660 | |
| 2661 | if (enable) |
| 2662 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; |
| 2663 | else |
| 2664 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; |
| 2665 | |
| 2666 | if (glob[0] == '!') { |
| 2667 | unregister_ftrace_function_probe_func(glob+1, ops); |
| 2668 | ret = 0; |
| 2669 | goto out; |
| 2670 | } |
| 2671 | |
| 2672 | ret = -ENOMEM; |
| 2673 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
| 2674 | if (!data) |
| 2675 | goto out; |
| 2676 | |
| 2677 | data->enable = enable; |
| 2678 | data->count = -1; |
| 2679 | data->file = file; |
| 2680 | |
| 2681 | if (!param) |
| 2682 | goto out_reg; |
| 2683 | |
| 2684 | number = strsep(¶m, ":"); |
| 2685 | |
| 2686 | ret = -EINVAL; |
| 2687 | if (!strlen(number)) |
| 2688 | goto out_free; |
| 2689 | |
| 2690 | /* |
| 2691 | * We use the callback data field (which is a pointer) |
| 2692 | * as our counter. |
| 2693 | */ |
| 2694 | ret = kstrtoul(number, 0, &data->count); |
| 2695 | if (ret) |
| 2696 | goto out_free; |
| 2697 | |
| 2698 | out_reg: |
| 2699 | /* Don't let event modules unload while probe registered */ |
| 2700 | ret = try_module_get(file->event_call->mod); |
Masami Hiramatsu | 6ed0106 | 2013-05-16 20:48:49 +0900 | [diff] [blame] | 2701 | if (!ret) { |
| 2702 | ret = -EBUSY; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2703 | goto out_free; |
Masami Hiramatsu | 6ed0106 | 2013-05-16 20:48:49 +0900 | [diff] [blame] | 2704 | } |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2705 | |
| 2706 | ret = __ftrace_event_enable_disable(file, 1, 1); |
| 2707 | if (ret < 0) |
| 2708 | goto out_put; |
| 2709 | ret = register_ftrace_function_probe(glob, ops, data); |
Steven Rostedt (Red Hat) | ff305de | 2013-05-09 11:30:26 -0400 | [diff] [blame] | 2710 | /* |
| 2711 | * The above returns on success the # of functions enabled, |
| 2712 | * but if it didn't find any functions it returns zero. |
| 2713 | * Consider no functions a failure too. |
| 2714 | */ |
Masami Hiramatsu | a5b85bd | 2013-05-09 14:44:14 +0900 | [diff] [blame] | 2715 | if (!ret) { |
| 2716 | ret = -ENOENT; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2717 | goto out_disable; |
Steven Rostedt (Red Hat) | ff305de | 2013-05-09 11:30:26 -0400 | [diff] [blame] | 2718 | } else if (ret < 0) |
| 2719 | goto out_disable; |
| 2720 | /* Just return zero, not the number of enabled functions */ |
| 2721 | ret = 0; |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 2722 | out: |
| 2723 | mutex_unlock(&event_mutex); |
| 2724 | return ret; |
| 2725 | |
| 2726 | out_disable: |
| 2727 | __ftrace_event_enable_disable(file, 0, 1); |
| 2728 | out_put: |
| 2729 | module_put(file->event_call->mod); |
| 2730 | out_free: |
| 2731 | kfree(data); |
| 2732 | goto out; |
| 2733 | } |
| 2734 | |
| 2735 | static struct ftrace_func_command event_enable_cmd = { |
| 2736 | .name = ENABLE_EVENT_STR, |
| 2737 | .func = event_enable_func, |
| 2738 | }; |
| 2739 | |
| 2740 | static struct ftrace_func_command event_disable_cmd = { |
| 2741 | .name = DISABLE_EVENT_STR, |
| 2742 | .func = event_enable_func, |
| 2743 | }; |
| 2744 | |
| 2745 | static __init int register_event_cmds(void) |
| 2746 | { |
| 2747 | int ret; |
| 2748 | |
| 2749 | ret = register_ftrace_command(&event_enable_cmd); |
| 2750 | if (WARN_ON(ret < 0)) |
| 2751 | return ret; |
| 2752 | ret = register_ftrace_command(&event_disable_cmd); |
| 2753 | if (WARN_ON(ret < 0)) |
| 2754 | unregister_ftrace_command(&event_enable_cmd); |
| 2755 | return ret; |
| 2756 | } |
| 2757 | #else |
| 2758 | static inline int register_event_cmds(void) { return 0; } |
| 2759 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
| 2760 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2761 | /* |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2762 | * The top level array has already had its trace_event_file |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2763 | * descriptors created in order to allow for early events to |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 2764 | * be recorded. This function is called after the tracefs has been |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2765 | * initialized, and we now have to create the files associated |
| 2766 | * to the events. |
| 2767 | */ |
| 2768 | static __init void |
| 2769 | __trace_early_add_event_dirs(struct trace_array *tr) |
| 2770 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2771 | struct trace_event_file *file; |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2772 | int ret; |
| 2773 | |
| 2774 | |
| 2775 | list_for_each_entry(file, &tr->events, list) { |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 2776 | ret = event_create_dir(tr->event_dir, file); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2777 | if (ret < 0) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2778 | pr_warn("Could not create directory for event %s\n", |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 2779 | trace_event_name(file->event_call)); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2780 | } |
| 2781 | } |
| 2782 | |
| 2783 | /* |
| 2784 | * For early boot up, the top trace array requires to have |
| 2785 | * a list of events that can be enabled. This must be done before |
| 2786 | * the filesystem is set up in order to allow events to be traced |
| 2787 | * early. |
| 2788 | */ |
| 2789 | static __init void |
| 2790 | __trace_early_add_events(struct trace_array *tr) |
| 2791 | { |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2792 | struct trace_event_call *call; |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2793 | int ret; |
| 2794 | |
| 2795 | list_for_each_entry(call, &ftrace_events, list) { |
| 2796 | /* Early boot up should not have any modules loaded */ |
| 2797 | if (WARN_ON_ONCE(call->mod)) |
| 2798 | continue; |
| 2799 | |
| 2800 | ret = __trace_early_add_new_event(call, tr); |
| 2801 | if (ret < 0) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 2802 | pr_warn("Could not create early event %s\n", |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 2803 | trace_event_name(call)); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2804 | } |
| 2805 | } |
| 2806 | |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2807 | /* Remove the event directory structure for a trace directory. */ |
| 2808 | static void |
| 2809 | __trace_remove_event_dirs(struct trace_array *tr) |
| 2810 | { |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2811 | struct trace_event_file *file, *next; |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2812 | |
Oleg Nesterov | f6a84bd | 2013-07-26 19:25:47 +0200 | [diff] [blame] | 2813 | list_for_each_entry_safe(file, next, &tr->events, list) |
| 2814 | remove_event_file_dir(file); |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2815 | } |
| 2816 | |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2817 | static void __add_event_to_tracers(struct trace_event_call *call) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2818 | { |
| 2819 | struct trace_array *tr; |
| 2820 | |
Oleg Nesterov | 620a30e | 2013-07-31 19:31:35 +0200 | [diff] [blame] | 2821 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
| 2822 | __trace_add_new_event(call, tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2823 | } |
| 2824 | |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 2825 | extern struct trace_event_call *__start_ftrace_events[]; |
| 2826 | extern struct trace_event_call *__stop_ftrace_events[]; |
Steven Rostedt | a59fd60 | 2009-04-10 13:52:20 -0400 | [diff] [blame] | 2827 | |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 2828 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
| 2829 | |
| 2830 | static __init int setup_trace_event(char *str) |
| 2831 | { |
| 2832 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); |
Steven Rostedt (Red Hat) | 55034cd | 2013-03-07 22:48:09 -0500 | [diff] [blame] | 2833 | ring_buffer_expanded = true; |
| 2834 | tracing_selftest_disabled = true; |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 2835 | |
| 2836 | return 1; |
| 2837 | } |
| 2838 | __setup("trace_event=", setup_trace_event); |
| 2839 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2840 | /* Expects to have event_mutex held when called */ |
| 2841 | static int |
| 2842 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2843 | { |
| 2844 | struct dentry *d_events; |
| 2845 | struct dentry *entry; |
| 2846 | |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 2847 | entry = tracefs_create_file("set_event", 0644, parent, |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2848 | tr, &ftrace_set_event_fops); |
| 2849 | if (!entry) { |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 2850 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2851 | return -ENOMEM; |
| 2852 | } |
| 2853 | |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 2854 | d_events = tracefs_create_dir("events", parent); |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2855 | if (!d_events) { |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 2856 | pr_warn("Could not create tracefs 'events' directory\n"); |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2857 | return -ENOMEM; |
| 2858 | } |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2859 | |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 2860 | entry = tracefs_create_file("set_event_pid", 0644, parent, |
| 2861 | tr, &ftrace_set_event_pid_fops); |
| 2862 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2863 | /* ring buffer internal formats */ |
| 2864 | trace_create_file("header_page", 0444, d_events, |
| 2865 | ring_buffer_print_page_header, |
| 2866 | &ftrace_show_header_fops); |
| 2867 | |
| 2868 | trace_create_file("header_event", 0444, d_events, |
| 2869 | ring_buffer_print_entry_header, |
| 2870 | &ftrace_show_header_fops); |
| 2871 | |
| 2872 | trace_create_file("enable", 0644, d_events, |
| 2873 | tr, &ftrace_tr_enable_fops); |
| 2874 | |
| 2875 | tr->event_dir = d_events; |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2876 | |
| 2877 | return 0; |
| 2878 | } |
| 2879 | |
| 2880 | /** |
| 2881 | * event_trace_add_tracer - add a instance of a trace_array to events |
| 2882 | * @parent: The parent dentry to place the files/directories for events in |
| 2883 | * @tr: The trace array associated with these events |
| 2884 | * |
| 2885 | * When a new instance is created, it needs to set up its events |
| 2886 | * directory, as well as other files associated with events. It also |
| 2887 | * creates the event hierachry in the @parent/events directory. |
| 2888 | * |
| 2889 | * Returns 0 on success. |
| 2890 | */ |
| 2891 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) |
| 2892 | { |
| 2893 | int ret; |
| 2894 | |
| 2895 | mutex_lock(&event_mutex); |
| 2896 | |
| 2897 | ret = create_event_toplevel_files(parent, tr); |
| 2898 | if (ret) |
| 2899 | goto out_unlock; |
| 2900 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2901 | down_write(&trace_event_sem); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2902 | __trace_add_event_dirs(tr); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2903 | up_write(&trace_event_sem); |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2904 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2905 | out_unlock: |
Steven Rostedt | 277ba04 | 2012-08-03 16:10:49 -0400 | [diff] [blame] | 2906 | mutex_unlock(&event_mutex); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2907 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2908 | return ret; |
| 2909 | } |
| 2910 | |
| 2911 | /* |
| 2912 | * The top trace array already had its file descriptors created. |
| 2913 | * Now the files themselves need to be created. |
| 2914 | */ |
| 2915 | static __init int |
| 2916 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) |
| 2917 | { |
| 2918 | int ret; |
| 2919 | |
| 2920 | mutex_lock(&event_mutex); |
| 2921 | |
| 2922 | ret = create_event_toplevel_files(parent, tr); |
| 2923 | if (ret) |
| 2924 | goto out_unlock; |
| 2925 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2926 | down_write(&trace_event_sem); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2927 | __trace_early_add_event_dirs(tr); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2928 | up_write(&trace_event_sem); |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 2929 | |
| 2930 | out_unlock: |
| 2931 | mutex_unlock(&event_mutex); |
| 2932 | |
| 2933 | return ret; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 2934 | } |
| 2935 | |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2936 | int event_trace_del_tracer(struct trace_array *tr) |
| 2937 | { |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2938 | mutex_lock(&event_mutex); |
| 2939 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 2940 | /* Disable any event triggers and associated soft-disabled events */ |
| 2941 | clear_event_triggers(tr); |
| 2942 | |
Steven Rostedt (Red Hat) | 4909010 | 2015-09-24 11:33:26 -0400 | [diff] [blame] | 2943 | /* Clear the pid list */ |
| 2944 | __ftrace_clear_event_pids(tr); |
| 2945 | |
Steven Rostedt (Red Hat) | 2a6c24a | 2013-07-02 14:48:23 -0400 | [diff] [blame] | 2946 | /* Disable any running events */ |
| 2947 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); |
| 2948 | |
Steven Rostedt | 3ccb012 | 2013-12-03 12:41:20 -0500 | [diff] [blame] | 2949 | /* Access to events are within rcu_read_lock_sched() */ |
| 2950 | synchronize_sched(); |
| 2951 | |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2952 | down_write(&trace_event_sem); |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2953 | __trace_remove_event_dirs(tr); |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 2954 | tracefs_remove_recursive(tr->event_dir); |
zhangwei(Jovi) | 52f6ad6 | 2013-03-11 15:14:03 +0800 | [diff] [blame] | 2955 | up_write(&trace_event_sem); |
Steven Rostedt | 0c8916c | 2012-08-07 16:14:16 -0400 | [diff] [blame] | 2956 | |
| 2957 | tr->event_dir = NULL; |
| 2958 | |
| 2959 | mutex_unlock(&event_mutex); |
| 2960 | |
| 2961 | return 0; |
| 2962 | } |
| 2963 | |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 2964 | static __init int event_trace_memsetup(void) |
| 2965 | { |
| 2966 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 2967 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
Steven Rostedt | d1a2914 | 2013-02-27 20:23:57 -0500 | [diff] [blame] | 2968 | return 0; |
| 2969 | } |
| 2970 | |
Steven Rostedt (Red Hat) | ce1039b | 2015-01-14 12:53:45 -0500 | [diff] [blame] | 2971 | static __init void |
| 2972 | early_enable_events(struct trace_array *tr, bool disable_first) |
| 2973 | { |
| 2974 | char *buf = bootup_event_buf; |
| 2975 | char *token; |
| 2976 | int ret; |
| 2977 | |
| 2978 | while (true) { |
| 2979 | token = strsep(&buf, ","); |
| 2980 | |
| 2981 | if (!token) |
| 2982 | break; |
Steven Rostedt (Red Hat) | ce1039b | 2015-01-14 12:53:45 -0500 | [diff] [blame] | 2983 | |
Steven Rostedt (Red Hat) | 43ed384 | 2015-11-03 22:15:14 -0500 | [diff] [blame] | 2984 | if (*token) { |
| 2985 | /* Restarting syscalls requires that we stop them first */ |
| 2986 | if (disable_first) |
| 2987 | ftrace_set_clr_event(tr, token, 0); |
Steven Rostedt (Red Hat) | ce1039b | 2015-01-14 12:53:45 -0500 | [diff] [blame] | 2988 | |
Steven Rostedt (Red Hat) | 43ed384 | 2015-11-03 22:15:14 -0500 | [diff] [blame] | 2989 | ret = ftrace_set_clr_event(tr, token, 1); |
| 2990 | if (ret) |
| 2991 | pr_warn("Failed to enable trace event: %s\n", token); |
| 2992 | } |
Steven Rostedt (Red Hat) | ce1039b | 2015-01-14 12:53:45 -0500 | [diff] [blame] | 2993 | |
| 2994 | /* Put back the comma to allow this to be called again */ |
| 2995 | if (buf) |
| 2996 | *(buf - 1) = ','; |
| 2997 | } |
| 2998 | } |
| 2999 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 3000 | static __init int event_trace_enable(void) |
| 3001 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3002 | struct trace_array *tr = top_trace_array(); |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 3003 | struct trace_event_call **iter, *call; |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 3004 | int ret; |
| 3005 | |
Yoshihiro YUNOMAE | dc81e5e | 2014-06-06 07:35:17 +0900 | [diff] [blame] | 3006 | if (!tr) |
| 3007 | return -ENODEV; |
| 3008 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 3009 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
| 3010 | |
| 3011 | call = *iter; |
| 3012 | ret = event_init(call); |
| 3013 | if (!ret) |
| 3014 | list_add(&call->list, &ftrace_events); |
| 3015 | } |
| 3016 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 3017 | /* |
| 3018 | * We need the top trace array to have a working set of trace |
| 3019 | * points at early init, before the debug files and directories |
| 3020 | * are created. Create the file entries now, and attach them |
| 3021 | * to the actual file dentries later. |
| 3022 | */ |
| 3023 | __trace_early_add_events(tr); |
| 3024 | |
Steven Rostedt (Red Hat) | ce1039b | 2015-01-14 12:53:45 -0500 | [diff] [blame] | 3025 | early_enable_events(tr, false); |
Steven Rostedt | 8169883 | 2012-10-11 10:15:05 -0400 | [diff] [blame] | 3026 | |
| 3027 | trace_printk_start_comm(); |
| 3028 | |
Steven Rostedt (Red Hat) | 3cd715d | 2013-03-12 19:35:13 -0400 | [diff] [blame] | 3029 | register_event_cmds(); |
| 3030 | |
Tom Zanussi | 85f2b08 | 2013-10-24 08:59:24 -0500 | [diff] [blame] | 3031 | register_trigger_cmds(); |
| 3032 | |
Ezequiel Garcia | 8781915 | 2012-09-12 11:47:57 -0300 | [diff] [blame] | 3033 | return 0; |
| 3034 | } |
| 3035 | |
Steven Rostedt (Red Hat) | ce1039b | 2015-01-14 12:53:45 -0500 | [diff] [blame] | 3036 | /* |
| 3037 | * event_trace_enable() is called from trace_event_init() first to |
| 3038 | * initialize events and perhaps start any events that are on the |
| 3039 | * command line. Unfortunately, there are some events that will not |
| 3040 | * start this early, like the system call tracepoints that need |
| 3041 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() |
| 3042 | * is called before pid 1 starts, and this flag is never set, making |
| 3043 | * the syscall tracepoint never get reached, but the event is enabled |
| 3044 | * regardless (and not doing anything). |
| 3045 | */ |
| 3046 | static __init int event_trace_enable_again(void) |
| 3047 | { |
| 3048 | struct trace_array *tr; |
| 3049 | |
| 3050 | tr = top_trace_array(); |
| 3051 | if (!tr) |
| 3052 | return -ENODEV; |
| 3053 | |
| 3054 | early_enable_events(tr, true); |
| 3055 | |
| 3056 | return 0; |
| 3057 | } |
| 3058 | |
| 3059 | early_initcall(event_trace_enable_again); |
| 3060 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 3061 | static __init int event_trace_init(void) |
| 3062 | { |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3063 | struct trace_array *tr; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 3064 | struct dentry *d_tracer; |
| 3065 | struct dentry *entry; |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 3066 | int ret; |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 3067 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3068 | tr = top_trace_array(); |
Yoshihiro YUNOMAE | dc81e5e | 2014-06-06 07:35:17 +0900 | [diff] [blame] | 3069 | if (!tr) |
| 3070 | return -ENODEV; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3071 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 3072 | d_tracer = tracing_init_dentry(); |
Steven Rostedt (Red Hat) | 14a5ae4 | 2015-01-20 11:14:16 -0500 | [diff] [blame] | 3073 | if (IS_ERR(d_tracer)) |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 3074 | return 0; |
| 3075 | |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 3076 | entry = tracefs_create_file("available_events", 0444, d_tracer, |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3077 | tr, &ftrace_avail_fops); |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 3078 | if (!entry) |
Steven Rostedt (Red Hat) | 8434dc9 | 2015-01-20 12:13:40 -0500 | [diff] [blame] | 3079 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
Steven Rostedt | 2314c4a | 2009-03-10 12:04:02 -0400 | [diff] [blame] | 3080 | |
Daniel Wagner | 9f61668 | 2015-08-10 14:35:46 +0200 | [diff] [blame] | 3081 | if (trace_define_generic_fields()) |
| 3082 | pr_warn("tracing: Failed to allocated generic fields"); |
| 3083 | |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 3084 | if (trace_define_common_fields()) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 3085 | pr_warn("tracing: Failed to allocate common fields"); |
Li Zefan | 8728fe5 | 2010-05-24 16:22:49 +0800 | [diff] [blame] | 3086 | |
Steven Rostedt | 7724822 | 2013-02-27 16:28:06 -0500 | [diff] [blame] | 3087 | ret = early_event_add_tracer(d_tracer, tr); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3088 | if (ret) |
| 3089 | return ret; |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 3090 | |
Oleg Nesterov | 836d481 | 2013-07-31 19:31:37 +0200 | [diff] [blame] | 3091 | #ifdef CONFIG_MODULES |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 3092 | ret = register_module_notifier(&trace_module_nb); |
Ming Lei | 5537937 | 2009-05-18 23:04:46 +0800 | [diff] [blame] | 3093 | if (ret) |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 3094 | pr_warn("Failed to register trace events module notifier\n"); |
Oleg Nesterov | 836d481 | 2013-07-31 19:31:37 +0200 | [diff] [blame] | 3095 | #endif |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 3096 | return 0; |
| 3097 | } |
Steven Rostedt (Red Hat) | 5f893b2 | 2014-12-12 20:05:10 -0500 | [diff] [blame] | 3098 | |
| 3099 | void __init trace_event_init(void) |
| 3100 | { |
| 3101 | event_trace_memsetup(); |
| 3102 | init_ftrace_syscalls(); |
| 3103 | event_trace_enable(); |
| 3104 | } |
| 3105 | |
Steven Rostedt | b77e38a | 2009-02-24 10:21:36 -0500 | [diff] [blame] | 3106 | fs_initcall(event_trace_init); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3107 | |
| 3108 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 3109 | |
| 3110 | static DEFINE_SPINLOCK(test_spinlock); |
| 3111 | static DEFINE_SPINLOCK(test_spinlock_irq); |
| 3112 | static DEFINE_MUTEX(test_mutex); |
| 3113 | |
| 3114 | static __init void test_work(struct work_struct *dummy) |
| 3115 | { |
| 3116 | spin_lock(&test_spinlock); |
| 3117 | spin_lock_irq(&test_spinlock_irq); |
| 3118 | udelay(1); |
| 3119 | spin_unlock_irq(&test_spinlock_irq); |
| 3120 | spin_unlock(&test_spinlock); |
| 3121 | |
| 3122 | mutex_lock(&test_mutex); |
| 3123 | msleep(1); |
| 3124 | mutex_unlock(&test_mutex); |
| 3125 | } |
| 3126 | |
| 3127 | static __init int event_test_thread(void *unused) |
| 3128 | { |
| 3129 | void *test_malloc; |
| 3130 | |
| 3131 | test_malloc = kmalloc(1234, GFP_KERNEL); |
| 3132 | if (!test_malloc) |
| 3133 | pr_info("failed to kmalloc\n"); |
| 3134 | |
| 3135 | schedule_on_each_cpu(test_work); |
| 3136 | |
| 3137 | kfree(test_malloc); |
| 3138 | |
| 3139 | set_current_state(TASK_INTERRUPTIBLE); |
Peter Zijlstra | fe0e01c | 2014-10-08 18:51:10 +0200 | [diff] [blame] | 3140 | while (!kthread_should_stop()) { |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3141 | schedule(); |
Peter Zijlstra | fe0e01c | 2014-10-08 18:51:10 +0200 | [diff] [blame] | 3142 | set_current_state(TASK_INTERRUPTIBLE); |
| 3143 | } |
| 3144 | __set_current_state(TASK_RUNNING); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3145 | |
| 3146 | return 0; |
| 3147 | } |
| 3148 | |
| 3149 | /* |
| 3150 | * Do various things that may trigger events. |
| 3151 | */ |
| 3152 | static __init void event_test_stuff(void) |
| 3153 | { |
| 3154 | struct task_struct *test_thread; |
| 3155 | |
| 3156 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); |
| 3157 | msleep(1); |
| 3158 | kthread_stop(test_thread); |
| 3159 | } |
| 3160 | |
| 3161 | /* |
| 3162 | * For every trace event defined, we will test each trace point separately, |
| 3163 | * and then by groups, and finally all trace points. |
| 3164 | */ |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3165 | static __init void event_trace_self_tests(void) |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3166 | { |
Steven Rostedt (Red Hat) | 7967b3e | 2015-05-13 14:59:40 -0400 | [diff] [blame] | 3167 | struct trace_subsystem_dir *dir; |
Steven Rostedt (Red Hat) | 7f1d2f8 | 2015-05-05 10:09:53 -0400 | [diff] [blame] | 3168 | struct trace_event_file *file; |
Steven Rostedt (Red Hat) | 2425bcb | 2015-05-05 11:45:27 -0400 | [diff] [blame] | 3169 | struct trace_event_call *call; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3170 | struct event_subsystem *system; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3171 | struct trace_array *tr; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3172 | int ret; |
| 3173 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3174 | tr = top_trace_array(); |
Yoshihiro YUNOMAE | dc81e5e | 2014-06-06 07:35:17 +0900 | [diff] [blame] | 3175 | if (!tr) |
| 3176 | return; |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3177 | |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3178 | pr_info("Running tests on trace events:\n"); |
| 3179 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3180 | list_for_each_entry(file, &tr->events, list) { |
| 3181 | |
| 3182 | call = file->event_call; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3183 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 3184 | /* Only test those that have a probe */ |
| 3185 | if (!call->class || !call->class->probe) |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3186 | continue; |
| 3187 | |
Steven Rostedt | 1f5a6b4 | 2009-09-14 11:58:24 -0400 | [diff] [blame] | 3188 | /* |
| 3189 | * Testing syscall events here is pretty useless, but |
| 3190 | * we still do it if configured. But this is time consuming. |
| 3191 | * What we really need is a user thread to perform the |
| 3192 | * syscalls as we test. |
| 3193 | */ |
| 3194 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 3195 | if (call->class->system && |
| 3196 | strcmp(call->class->system, "syscalls") == 0) |
Steven Rostedt | 1f5a6b4 | 2009-09-14 11:58:24 -0400 | [diff] [blame] | 3197 | continue; |
| 3198 | #endif |
| 3199 | |
Steven Rostedt (Red Hat) | 687fcc4 | 2015-05-13 14:20:14 -0400 | [diff] [blame] | 3200 | pr_info("Testing event %s: ", trace_event_name(call)); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3201 | |
| 3202 | /* |
| 3203 | * If an event is already enabled, someone is using |
| 3204 | * it and the self test should not be on. |
| 3205 | */ |
Steven Rostedt (Red Hat) | 5d6ad96 | 2015-05-13 15:12:33 -0400 | [diff] [blame] | 3206 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 3207 | pr_warn("Enabled event during self test!\n"); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3208 | WARN_ON_ONCE(1); |
| 3209 | continue; |
| 3210 | } |
| 3211 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3212 | ftrace_event_enable_disable(file, 1); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3213 | event_test_stuff(); |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3214 | ftrace_event_enable_disable(file, 0); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3215 | |
| 3216 | pr_cont("OK\n"); |
| 3217 | } |
| 3218 | |
| 3219 | /* Now test at the sub system level */ |
| 3220 | |
| 3221 | pr_info("Running tests on trace event systems:\n"); |
| 3222 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3223 | list_for_each_entry(dir, &tr->systems, list) { |
| 3224 | |
| 3225 | system = dir->subsystem; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3226 | |
| 3227 | /* the ftrace system is special, skip it */ |
| 3228 | if (strcmp(system->name, "ftrace") == 0) |
| 3229 | continue; |
| 3230 | |
| 3231 | pr_info("Testing event system %s: ", system->name); |
| 3232 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3233 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3234 | if (WARN_ON_ONCE(ret)) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 3235 | pr_warn("error enabling system %s\n", |
| 3236 | system->name); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3237 | continue; |
| 3238 | } |
| 3239 | |
| 3240 | event_test_stuff(); |
| 3241 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3242 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
Yuanhan Liu | 76bab1b | 2012-08-27 15:13:45 +0800 | [diff] [blame] | 3243 | if (WARN_ON_ONCE(ret)) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 3244 | pr_warn("error disabling system %s\n", |
| 3245 | system->name); |
Yuanhan Liu | 76bab1b | 2012-08-27 15:13:45 +0800 | [diff] [blame] | 3246 | continue; |
| 3247 | } |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3248 | |
| 3249 | pr_cont("OK\n"); |
| 3250 | } |
| 3251 | |
| 3252 | /* Test with all events enabled */ |
| 3253 | |
| 3254 | pr_info("Running tests on all trace events:\n"); |
| 3255 | pr_info("Testing all events: "); |
| 3256 | |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3257 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3258 | if (WARN_ON_ONCE(ret)) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 3259 | pr_warn("error enabling all events\n"); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3260 | return; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3261 | } |
| 3262 | |
| 3263 | event_test_stuff(); |
| 3264 | |
| 3265 | /* reset sysname */ |
Steven Rostedt | ae63b31 | 2012-05-03 23:09:03 -0400 | [diff] [blame] | 3266 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3267 | if (WARN_ON_ONCE(ret)) { |
Fabian Frederick | 3448bac | 2014-06-07 13:43:08 +0200 | [diff] [blame] | 3268 | pr_warn("error disabling all events\n"); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3269 | return; |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3270 | } |
| 3271 | |
| 3272 | pr_cont("OK\n"); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3273 | } |
| 3274 | |
| 3275 | #ifdef CONFIG_FUNCTION_TRACER |
| 3276 | |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 3277 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3278 | |
Steven Rostedt (Red Hat) | 9b9db27 | 2016-04-29 18:10:21 -0400 | [diff] [blame] | 3279 | static struct trace_event_file event_trace_file __initdata; |
Steven Rostedt (Red Hat) | b7f0c95 | 2015-09-25 17:38:44 -0400 | [diff] [blame] | 3280 | |
| 3281 | static void __init |
Steven Rostedt | 2f5f6ad | 2011-08-08 16:57:47 -0400 | [diff] [blame] | 3282 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
Steven Rostedt | a1e2e31 | 2011-08-09 12:50:46 -0400 | [diff] [blame] | 3283 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3284 | { |
| 3285 | struct ring_buffer_event *event; |
Steven Rostedt | e77405a | 2009-09-02 14:17:06 -0400 | [diff] [blame] | 3286 | struct ring_buffer *buffer; |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3287 | struct ftrace_entry *entry; |
| 3288 | unsigned long flags; |
| 3289 | long disabled; |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3290 | int cpu; |
| 3291 | int pc; |
| 3292 | |
| 3293 | pc = preempt_count(); |
Steven Rostedt | 5168ae5 | 2010-06-03 09:36:50 -0400 | [diff] [blame] | 3294 | preempt_disable_notrace(); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3295 | cpu = raw_smp_processor_id(); |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 3296 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3297 | |
| 3298 | if (disabled != 1) |
| 3299 | goto out; |
| 3300 | |
| 3301 | local_save_flags(flags); |
| 3302 | |
Steven Rostedt (Red Hat) | 9b9db27 | 2016-04-29 18:10:21 -0400 | [diff] [blame] | 3303 | event = trace_event_buffer_lock_reserve(&buffer, &event_trace_file, |
| 3304 | TRACE_FN, sizeof(*entry), |
| 3305 | flags, pc); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3306 | if (!event) |
| 3307 | goto out; |
| 3308 | entry = ring_buffer_event_data(event); |
| 3309 | entry->ip = ip; |
| 3310 | entry->parent_ip = parent_ip; |
| 3311 | |
Steven Rostedt (Red Hat) | 9b9db27 | 2016-04-29 18:10:21 -0400 | [diff] [blame] | 3312 | event_trigger_unlock_commit(&event_trace_file, buffer, event, |
| 3313 | entry, flags, pc); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3314 | out: |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 3315 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
Steven Rostedt | 5168ae5 | 2010-06-03 09:36:50 -0400 | [diff] [blame] | 3316 | preempt_enable_notrace(); |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3317 | } |
| 3318 | |
| 3319 | static struct ftrace_ops trace_ops __initdata = |
| 3320 | { |
| 3321 | .func = function_test_events_call, |
Steven Rostedt | 4740974 | 2012-07-20 11:04:44 -0400 | [diff] [blame] | 3322 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3323 | }; |
| 3324 | |
| 3325 | static __init void event_trace_self_test_with_function(void) |
| 3326 | { |
Steven Rostedt | 17bb615 | 2011-05-23 15:27:46 -0400 | [diff] [blame] | 3327 | int ret; |
Steven Rostedt (Red Hat) | 9b9db27 | 2016-04-29 18:10:21 -0400 | [diff] [blame] | 3328 | |
| 3329 | event_trace_file.tr = top_trace_array(); |
| 3330 | if (WARN_ON(!event_trace_file.tr)) |
Steven Rostedt (Red Hat) | 2d34f48 | 2015-09-30 11:45:22 -0400 | [diff] [blame] | 3331 | return; |
Steven Rostedt (Red Hat) | 9b9db27 | 2016-04-29 18:10:21 -0400 | [diff] [blame] | 3332 | |
Steven Rostedt | 17bb615 | 2011-05-23 15:27:46 -0400 | [diff] [blame] | 3333 | ret = register_ftrace_function(&trace_ops); |
| 3334 | if (WARN_ON(ret < 0)) { |
| 3335 | pr_info("Failed to enable function tracer for event tests\n"); |
| 3336 | return; |
| 3337 | } |
Steven Rostedt | 9ea21c1 | 2009-04-16 12:15:44 -0400 | [diff] [blame] | 3338 | pr_info("Running tests again, along with the function tracer\n"); |
| 3339 | event_trace_self_tests(); |
| 3340 | unregister_ftrace_function(&trace_ops); |
| 3341 | } |
| 3342 | #else |
| 3343 | static __init void event_trace_self_test_with_function(void) |
| 3344 | { |
| 3345 | } |
| 3346 | #endif |
| 3347 | |
| 3348 | static __init int event_trace_self_tests_init(void) |
| 3349 | { |
Li Zefan | 020e5f8 | 2009-07-01 10:47:05 +0800 | [diff] [blame] | 3350 | if (!tracing_selftest_disabled) { |
| 3351 | event_trace_self_tests(); |
| 3352 | event_trace_self_test_with_function(); |
| 3353 | } |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3354 | |
| 3355 | return 0; |
| 3356 | } |
| 3357 | |
Steven Rostedt | 28d20e2 | 2009-04-20 12:12:44 -0400 | [diff] [blame] | 3358 | late_initcall(event_trace_self_tests_init); |
Steven Rostedt | e618700 | 2009-04-15 13:36:40 -0400 | [diff] [blame] | 3359 | |
| 3360 | #endif |