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1 | /** |
2 | * @file oprof.c |
3 | * |
4 | * @remark Copyright 2002 OProfile authors |
5 | * @remark Read the file COPYING |
6 | * |
7 | * @author John Levon <levon@movementarian.org> |
8 | */ |
9 | |
10 | #include <linux/kernel.h> |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> |
13 | #include <linux/oprofile.h> |
14 | #include <linux/moduleparam.h> |
15 | #include <linux/workqueue.h> |
16 | #include <linux/time.h> |
17 | #include <linux/mutex.h> |
18 | |
19 | #include "oprof.h" |
20 | #include "event_buffer.h" |
21 | #include "cpu_buffer.h" |
22 | #include "buffer_sync.h" |
23 | #include "oprofile_stats.h" |
24 | |
25 | struct oprofile_operations oprofile_ops; |
26 | |
27 | unsigned long oprofile_started; |
28 | unsigned long oprofile_backtrace_depth; |
29 | static unsigned long is_setup; |
30 | static DEFINE_MUTEX(start_mutex); |
31 | |
32 | /* timer |
33 | 0 - use performance monitoring hardware if available |
34 | 1 - use the timer int mechanism regardless |
35 | */ |
36 | static int timer = 0; |
37 | |
38 | int oprofile_setup(void) |
39 | { |
40 | int err; |
41 | |
42 | mutex_lock(&start_mutex); |
43 | |
44 | if ((err = alloc_cpu_buffers())) |
45 | goto out; |
46 | |
47 | if ((err = alloc_event_buffer())) |
48 | goto out1; |
49 | |
50 | if (oprofile_ops.setup && (err = oprofile_ops.setup())) |
51 | goto out2; |
52 | |
53 | /* Note even though this starts part of the |
54 | * profiling overhead, it's necessary to prevent |
55 | * us missing task deaths and eventually oopsing |
56 | * when trying to process the event buffer. |
57 | */ |
58 | if (oprofile_ops.sync_start) { |
59 | int sync_ret = oprofile_ops.sync_start(); |
60 | switch (sync_ret) { |
61 | case 0: |
62 | goto post_sync; |
63 | case 1: |
64 | goto do_generic; |
65 | case -1: |
66 | goto out3; |
67 | default: |
68 | goto out3; |
69 | } |
70 | } |
71 | do_generic: |
72 | if ((err = sync_start())) |
73 | goto out3; |
74 | |
75 | post_sync: |
76 | is_setup = 1; |
77 | mutex_unlock(&start_mutex); |
78 | return 0; |
79 | |
80 | out3: |
81 | if (oprofile_ops.shutdown) |
82 | oprofile_ops.shutdown(); |
83 | out2: |
84 | free_event_buffer(); |
85 | out1: |
86 | free_cpu_buffers(); |
87 | out: |
88 | mutex_unlock(&start_mutex); |
89 | return err; |
90 | } |
91 | |
92 | #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX |
93 | |
94 | static void switch_worker(struct work_struct *work); |
95 | static DECLARE_DELAYED_WORK(switch_work, switch_worker); |
96 | |
97 | static void start_switch_worker(void) |
98 | { |
99 | if (oprofile_ops.switch_events) |
100 | schedule_delayed_work(&switch_work, oprofile_time_slice); |
101 | } |
102 | |
103 | static void stop_switch_worker(void) |
104 | { |
105 | cancel_delayed_work_sync(&switch_work); |
106 | } |
107 | |
108 | static void switch_worker(struct work_struct *work) |
109 | { |
110 | if (oprofile_ops.switch_events()) |
111 | return; |
112 | |
113 | atomic_inc(&oprofile_stats.multiplex_counter); |
114 | start_switch_worker(); |
115 | } |
116 | |
117 | /* User inputs in ms, converts to jiffies */ |
118 | int oprofile_set_timeout(unsigned long val_msec) |
119 | { |
120 | int err = 0; |
121 | unsigned long time_slice; |
122 | |
123 | mutex_lock(&start_mutex); |
124 | |
125 | if (oprofile_started) { |
126 | err = -EBUSY; |
127 | goto out; |
128 | } |
129 | |
130 | if (!oprofile_ops.switch_events) { |
131 | err = -EINVAL; |
132 | goto out; |
133 | } |
134 | |
135 | time_slice = msecs_to_jiffies(val_msec); |
136 | if (time_slice == MAX_JIFFY_OFFSET) { |
137 | err = -EINVAL; |
138 | goto out; |
139 | } |
140 | |
141 | oprofile_time_slice = time_slice; |
142 | |
143 | out: |
144 | mutex_unlock(&start_mutex); |
145 | return err; |
146 | |
147 | } |
148 | |
149 | #else |
150 | |
151 | static inline void start_switch_worker(void) { } |
152 | static inline void stop_switch_worker(void) { } |
153 | |
154 | #endif |
155 | |
156 | /* Actually start profiling (echo 1>/dev/oprofile/enable) */ |
157 | int oprofile_start(void) |
158 | { |
159 | int err = -EINVAL; |
160 | |
161 | mutex_lock(&start_mutex); |
162 | |
163 | if (!is_setup) |
164 | goto out; |
165 | |
166 | err = 0; |
167 | |
168 | if (oprofile_started) |
169 | goto out; |
170 | |
171 | oprofile_reset_stats(); |
172 | |
173 | if ((err = oprofile_ops.start())) |
174 | goto out; |
175 | |
176 | start_switch_worker(); |
177 | |
178 | oprofile_started = 1; |
179 | out: |
180 | mutex_unlock(&start_mutex); |
181 | return err; |
182 | } |
183 | |
184 | |
185 | /* echo 0>/dev/oprofile/enable */ |
186 | void oprofile_stop(void) |
187 | { |
188 | mutex_lock(&start_mutex); |
189 | if (!oprofile_started) |
190 | goto out; |
191 | oprofile_ops.stop(); |
192 | oprofile_started = 0; |
193 | |
194 | stop_switch_worker(); |
195 | |
196 | /* wake up the daemon to read what remains */ |
197 | wake_up_buffer_waiter(); |
198 | out: |
199 | mutex_unlock(&start_mutex); |
200 | } |
201 | |
202 | |
203 | void oprofile_shutdown(void) |
204 | { |
205 | mutex_lock(&start_mutex); |
206 | if (oprofile_ops.sync_stop) { |
207 | int sync_ret = oprofile_ops.sync_stop(); |
208 | switch (sync_ret) { |
209 | case 0: |
210 | goto post_sync; |
211 | case 1: |
212 | goto do_generic; |
213 | default: |
214 | goto post_sync; |
215 | } |
216 | } |
217 | do_generic: |
218 | sync_stop(); |
219 | post_sync: |
220 | if (oprofile_ops.shutdown) |
221 | oprofile_ops.shutdown(); |
222 | is_setup = 0; |
223 | free_event_buffer(); |
224 | free_cpu_buffers(); |
225 | mutex_unlock(&start_mutex); |
226 | } |
227 | |
228 | int oprofile_set_ulong(unsigned long *addr, unsigned long val) |
229 | { |
230 | int err = -EBUSY; |
231 | |
232 | mutex_lock(&start_mutex); |
233 | if (!oprofile_started) { |
234 | *addr = val; |
235 | err = 0; |
236 | } |
237 | mutex_unlock(&start_mutex); |
238 | |
239 | return err; |
240 | } |
241 | |
242 | static int timer_mode; |
243 | |
244 | static int __init oprofile_init(void) |
245 | { |
246 | int err; |
247 | |
248 | /* always init architecture to setup backtrace support */ |
249 | timer_mode = 0; |
250 | err = oprofile_arch_init(&oprofile_ops); |
251 | if (!err) { |
252 | if (!timer && !oprofilefs_register()) |
253 | return 0; |
254 | oprofile_arch_exit(); |
255 | } |
256 | |
257 | /* setup timer mode: */ |
258 | timer_mode = 1; |
259 | /* no nmi timer mode if oprofile.timer is set */ |
260 | if (timer || op_nmi_timer_init(&oprofile_ops)) { |
261 | err = oprofile_timer_init(&oprofile_ops); |
262 | if (err) |
263 | return err; |
264 | } |
265 | |
266 | return oprofilefs_register(); |
267 | } |
268 | |
269 | |
270 | static void __exit oprofile_exit(void) |
271 | { |
272 | oprofilefs_unregister(); |
273 | if (!timer_mode) |
274 | oprofile_arch_exit(); |
275 | } |
276 | |
277 | |
278 | module_init(oprofile_init); |
279 | module_exit(oprofile_exit); |
280 | |
281 | module_param_named(timer, timer, int, 0644); |
282 | MODULE_PARM_DESC(timer, "force use of timer interrupt"); |
283 | |
284 | MODULE_LICENSE("GPL"); |
285 | MODULE_AUTHOR("John Levon <levon@movementarian.org>"); |
286 | MODULE_DESCRIPTION("OProfile system profiler"); |
287 |
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