1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2015 Intel Corporation
4 #ifndef LTHREAD_DIAG_API_H_
5 #define LTHREAD_DIAG_API_H_
16 * 0 = conditionally compiled out
17 * 1 = compiled in and maskable at run time, see below for details
19 #define LTHREAD_DIAG 0
23 * @file lthread_diag_api.h
26 * @b EXPERIMENTAL: this API may change without prior notice
28 * lthread diagnostic interface
30 * If enabled via configuration file option ( tbd ) the lthread subsystem
31 * can generate selected trace information, either RTE_LOG (INFO) messages,
32 * or else invoke a user supplied callback function when any of the events
35 * Reporting of events can be selectively masked, the bit position in the
36 * mask is determined by the corresponding event identifier listed below.
38 * Diagnostics are enabled by registering the callback function and mask
39 * using the API lthread_diagnostic_enable().
41 * Various interesting parameters are passed to the callback, including the
42 * time in cpu clks, the lthread id, the diagnostic event id, a user ref value,
43 * event text string, object being traced, and two context dependent parameters
44 * (p1 and p2). The meaning of the two parameters p1 and p2 depends on
47 * The events LT_DIAG_LTHREAD_CREATE, LT_DIAG_MUTEX_CREATE and
48 * LT_DIAG_COND_CREATE are implicitly enabled if the event mask includes any of
49 * the LT_DIAG_LTHREAD_XXX, LT_DIAG_MUTEX_XXX or LT_DIAG_COND_XXX events
52 * These create events may also be included in the mask discreetly if it is
53 * desired to monitor only create events.
56 * The time in cpu clks at which the event occurred
62 * The diagnostic event id (bit position in the mask)
66 * For LT_DIAG_LTHREAD_CREATE, LT_DIAG_MUTEX_CREATE or LT_DIAG_COND_CREATE
67 * this parameter is not used and set to 0.
68 * All other events diag_ref contains the user ref value returned by the
69 * callback function when lthread is created.
71 * The diag_ref values assigned to mutex and cond var can be retrieved
72 * using the APIs lthread_mutex_diag_ref(), and lthread_cond_diag_ref()
82 * For LT_DIAG_LTHREAD_CREATE, LT_DIAG_MUTEX_CREATE or LT_DIAG_COND_CREATE
83 * expects a user diagnostic ref value that will be saved in the lthread, mutex
86 * For all other events return value is ignored.
88 * LT_DIAG_SCHED_CREATE - Invoked when a scheduler is created
89 * p1 = the scheduler that was created
91 * return value will be ignored
93 * LT_DIAG_SCHED_SHUTDOWN - Invoked when a shutdown request is received
94 * p1 = the scheduler to be shutdown
96 * return value will be ignored
98 * LT_DIAG_LTHREAD_CREATE - Invoked when a thread is created
99 * p1 = the lthread that was created
101 * return value will be stored in the lthread
103 * LT_DIAG_LTHREAD_EXIT - Invoked when a lthread exits
104 * p2 = 0 if the thread was already joined
105 * p2 = 1 if the thread was not already joined
108 * LT_DIAG_LTHREAD_JOIN - Invoked when a lthread exits
109 * p1 = the lthread that is being joined
110 * p2 = 0 if the thread was already exited
111 * p2 = 1 if the thread was not already exited
114 * LT_DIAG_LTHREAD_CANCELLED - Invoked when an lthread is cancelled
119 * LT_DIAG_LTHREAD_DETACH - Invoked when an lthread is detached
124 * LT_DIAG_LTHREAD_FREE - Invoked when an lthread is freed
129 * LT_DIAG_LTHREAD_SUSPENDED - Invoked when an lthread is suspended
134 * LT_DIAG_LTHREAD_YIELD - Invoked when an lthread explicitly yields
139 * LT_DIAG_LTHREAD_RESCHEDULED - Invoked when an lthread is rescheduled
144 * LT_DIAG_LTHREAD_RESUMED - Invoked when an lthread is resumed
149 * LT_DIAG_LTHREAD_AFFINITY - Invoked when an lthread is affinitised
150 * p1 = the destination lcore_id
154 * LT_DIAG_LTHREAD_TMR_START - Invoked when an lthread starts a timer
155 * p1 = address of timer node
156 * p2 = the timeout value
159 * LT_DIAG_LTHREAD_TMR_DELETE - Invoked when an lthread deletes a timer
160 * p1 = address of the timer node
161 * p2 = 0 the timer and the was successfully deleted
165 * LT_DIAG_LTHREAD_TMR_EXPIRED - Invoked when an lthread timer expires
166 * p1 = address of scheduler the timer expired on
167 * p2 = the thread associated with the timer
170 * LT_DIAG_COND_CREATE - Invoked when a condition variable is created
171 * p1 = address of cond var that was created
173 * return diag ref value will be stored in the condition variable
175 * LT_DIAG_COND_DESTROY - Invoked when a condition variable is destroyed
180 * LT_DIAG_COND_WAIT - Invoked when an lthread waits on a cond var
181 * p1 = the address of the condition variable
185 * LT_DIAG_COND_SIGNAL - Invoked when an lthread signals a cond var
186 * p1 = the address of the cond var
187 * p2 = the lthread that was signalled, or error code
190 * LT_DIAG_COND_BROADCAST - Invoked when an lthread broadcasts a cond var
191 * p1 = the address of the condition variable
192 * p2 = the lthread(s) that are signalled, or error code
194 * LT_DIAG_MUTEX_CREATE - Invoked when a mutex is created
195 * p1 = address of muex
197 * return diag ref value will be stored in the mutex variable
199 * LT_DIAG_MUTEX_DESTROY - Invoked when a mutex is destroyed
200 * p1 = address of mutex
204 * LT_DIAG_MUTEX_LOCK - Invoked when a mutex lock is obtained
205 * p1 = address of mutex
206 * p2 = function return value
209 * LT_DIAG_MUTEX_BLOCKED - Invoked when an lthread blocks on a mutex
210 * p1 = address of mutex
211 * p2 = function return value
214 * LT_DIAG_MUTEX_TRYLOCK - Invoked when a mutex try lock is attempted
215 * p1 = address of mutex
216 * p2 = the function return value
219 * LT_DIAG_MUTEX_UNLOCKED - Invoked when a mutex is unlocked
220 * p1 = address of mutex
221 * p2 = the thread that was unlocked, or error code
224 typedef uint64_t (*diag_callback) (uint64_t time, struct lthread *lt,
225 int diag_event, uint64_t diag_ref,
226 const char *text, uint64_t p1, uint64_t p2);
229 * Set user diagnostic callback and mask
230 * If the callback function pointer is NULL the default
231 * callback handler will be restored.
233 void lthread_diagnostic_enable(diag_callback cb, uint64_t diag_mask);
236 * Set diagnostic mask
238 void lthread_diagnostic_set_mask(uint64_t mask);
241 * lthread diagnostic callback
243 enum lthread_diag_ev {
244 /* bits 0 - 14 lthread flag group */
245 LT_DIAG_LTHREAD_CREATE, /* 00 mask 0x00000001 */
246 LT_DIAG_LTHREAD_EXIT, /* 01 mask 0x00000002 */
247 LT_DIAG_LTHREAD_JOIN, /* 02 mask 0x00000004 */
248 LT_DIAG_LTHREAD_CANCEL, /* 03 mask 0x00000008 */
249 LT_DIAG_LTHREAD_DETACH, /* 04 mask 0x00000010 */
250 LT_DIAG_LTHREAD_FREE, /* 05 mask 0x00000020 */
251 LT_DIAG_LTHREAD_SUSPENDED, /* 06 mask 0x00000040 */
252 LT_DIAG_LTHREAD_YIELD, /* 07 mask 0x00000080 */
253 LT_DIAG_LTHREAD_RESCHEDULED, /* 08 mask 0x00000100 */
254 LT_DIAG_LTHREAD_SLEEP, /* 09 mask 0x00000200 */
255 LT_DIAG_LTHREAD_RESUMED, /* 10 mask 0x00000400 */
256 LT_DIAG_LTHREAD_AFFINITY, /* 11 mask 0x00000800 */
257 LT_DIAG_LTHREAD_TMR_START, /* 12 mask 0x00001000 */
258 LT_DIAG_LTHREAD_TMR_DELETE, /* 13 mask 0x00002000 */
259 LT_DIAG_LTHREAD_TMR_EXPIRED, /* 14 mask 0x00004000 */
260 /* bits 15 - 19 conditional variable flag group */
261 LT_DIAG_COND_CREATE, /* 15 mask 0x00008000 */
262 LT_DIAG_COND_DESTROY, /* 16 mask 0x00010000 */
263 LT_DIAG_COND_WAIT, /* 17 mask 0x00020000 */
264 LT_DIAG_COND_SIGNAL, /* 18 mask 0x00040000 */
265 LT_DIAG_COND_BROADCAST, /* 19 mask 0x00080000 */
266 /* bits 20 - 25 mutex flag group */
267 LT_DIAG_MUTEX_CREATE, /* 20 mask 0x00100000 */
268 LT_DIAG_MUTEX_DESTROY, /* 21 mask 0x00200000 */
269 LT_DIAG_MUTEX_LOCK, /* 22 mask 0x00400000 */
270 LT_DIAG_MUTEX_TRYLOCK, /* 23 mask 0x00800000 */
271 LT_DIAG_MUTEX_BLOCKED, /* 24 mask 0x01000000 */
272 LT_DIAG_MUTEX_UNLOCKED, /* 25 mask 0x02000000 */
273 /* bits 26 - 27 scheduler flag group - 8 bits */
274 LT_DIAG_SCHED_CREATE, /* 26 mask 0x04000000 */
275 LT_DIAG_SCHED_SHUTDOWN, /* 27 mask 0x08000000 */
279 #define LT_DIAG_ALL 0xffffffffffffffff
283 * Display scheduler stats
286 lthread_sched_stats_display(void);
289 * return the diagnostic ref val stored in a condition var
292 lthread_cond_diag_ref(struct lthread_cond *c);
295 * return the diagnostic ref val stored in a mutex
298 lthread_mutex_diag_ref(struct lthread_mutex *m);
304 #endif /* LTHREAD_DIAG_API_H_ */