1 /*
2 * Copyright (c) 2023, Intel Corporation
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #ifndef __KERNEL_OBJ_CORE_H__
8 #define __KERNEL_OBJ_CORE_H__
9
10 #include <zephyr/sys/slist.h>
11
12 /**
13 * @defgroup obj_core_apis Object Core APIs
14 * @ingroup kernel_apis
15 * @{
16 */
17
18 /**
19 * @brief Convert kernel object pointer into its object core pointer
20 */
21 #define K_OBJ_CORE(kobj) (&((kobj)->obj_core))
22
23 /**
24 * @brief Generate new object type IDs based on a 4 letter string
25 */
26 #define K_OBJ_TYPE_ID_GEN(s) ((s[0] << 24) | (s[1] << 16) | (s[2] << 8) | (s[3]))
27
28 /* Known kernel object types */
29
30 /** Condition variable object type */
31 #define K_OBJ_TYPE_CONDVAR_ID K_OBJ_TYPE_ID_GEN("COND")
32 /** CPU object type */
33 #define K_OBJ_TYPE_CPU_ID K_OBJ_TYPE_ID_GEN("CPU_")
34 /** Event object type */
35 #define K_OBJ_TYPE_EVENT_ID K_OBJ_TYPE_ID_GEN("EVNT")
36 /** FIFO object type */
37 #define K_OBJ_TYPE_FIFO_ID K_OBJ_TYPE_ID_GEN("FIFO")
38 /** Kernel object type */
39 #define K_OBJ_TYPE_KERNEL_ID K_OBJ_TYPE_ID_GEN("KRNL")
40 /** LIFO object type */
41 #define K_OBJ_TYPE_LIFO_ID K_OBJ_TYPE_ID_GEN("LIFO")
42 /** Memory block object type */
43 #define K_OBJ_TYPE_MEM_BLOCK_ID K_OBJ_TYPE_ID_GEN("MBLK")
44 /** Mailbox object type */
45 #define K_OBJ_TYPE_MBOX_ID K_OBJ_TYPE_ID_GEN("MBOX")
46 /** Memory slab object type */
47 #define K_OBJ_TYPE_MEM_SLAB_ID K_OBJ_TYPE_ID_GEN("SLAB")
48 /** Message queue object type */
49 #define K_OBJ_TYPE_MSGQ_ID K_OBJ_TYPE_ID_GEN("MSGQ")
50 /** Mutex object type */
51 #define K_OBJ_TYPE_MUTEX_ID K_OBJ_TYPE_ID_GEN("MUTX")
52 /** Pipe object type */
53 #define K_OBJ_TYPE_PIPE_ID K_OBJ_TYPE_ID_GEN("PIPE")
54 /** Semaphore object type */
55 #define K_OBJ_TYPE_SEM_ID K_OBJ_TYPE_ID_GEN("SEM4")
56 /** Stack object type */
57 #define K_OBJ_TYPE_STACK_ID K_OBJ_TYPE_ID_GEN("STCK")
58 /** Thread object type */
59 #define K_OBJ_TYPE_THREAD_ID K_OBJ_TYPE_ID_GEN("THRD")
60 /** Timer object type */
61 #define K_OBJ_TYPE_TIMER_ID K_OBJ_TYPE_ID_GEN("TIMR")
62
63 struct k_obj_type;
64 struct k_obj_core;
65
66 /**
67 * @cond INTERNAL_HIDDEN
68 */
69
70 #ifdef CONFIG_OBJ_CORE
71 #define K_OBJ_CORE_INIT(_objp, _obj_type) \
72 extern struct k_obj_type _obj_type; \
73 k_obj_core_init(_objp, &_obj_type)
74
75 #define K_OBJ_CORE_LINK(objp) k_obj_core_link(objp)
76 #else
77 #define K_OBJ_CORE_INIT(objp, type) do { } while (0)
78 #define K_OBJ_CORE_LINK(objp) do { } while (0)
79 #endif /* CONFIG_OBJ_CORE */
80
81 /**
82 * INTERNAL_HIDDEN @endcond
83 */
84
85 /**
86 * Tools may use this list as an entry point to identify all registered
87 * object types and the object cores linked to them.
88 */
89 extern sys_slist_t z_obj_type_list;
90
91 /** Object core statistics descriptor */
92 struct k_obj_core_stats_desc {
93 size_t raw_size; /**< Internal representation stats buffer size */
94 size_t query_size; /**< Stats buffer size used for reporting */
95
96 /** Function pointer to retrieve internal representation of stats */
97 int (*raw)(struct k_obj_core *obj_core, void *stats);
98 /** Function pointer to retrieve reported statistics */
99 int (*query)(struct k_obj_core *obj_core, void *stats);
100 /** Function pointer to reset object's statistics */
101 int (*reset)(struct k_obj_core *obj_core);
102 /** Function pointer to disable object's statistics gathering */
103 int (*disable)(struct k_obj_core *obj_core);
104 /** Function pointer to enable object's statistics gathering */
105 int (*enable)(struct k_obj_core *obj_core);
106 };
107
108 /** Object type structure */
109 struct k_obj_type {
110 sys_snode_t node; /**< Node within list of object types */
111 sys_slist_t list; /**< List of objects of this object type */
112 uint32_t id; /**< Unique type ID */
113 size_t obj_core_offset; /**< Offset to obj_core field */
114 #ifdef CONFIG_OBJ_CORE_STATS
115 /** Pointer to object core statistics descriptor */
116 struct k_obj_core_stats_desc *stats_desc;
117 #endif /* CONFIG_OBJ_CORE_STATS */
118 };
119
120 /** Object core structure */
121 struct k_obj_core {
122 sys_snode_t node; /**< Object node within object type's list */
123 struct k_obj_type *type; /**< Object type to which object belongs */
124 #ifdef CONFIG_OBJ_CORE_STATS
125 void *stats; /**< Pointer to kernel object's stats */
126 #endif /* CONFIG_OBJ_CORE_STATS */
127 };
128
129 /**
130 * @brief Initialize a specific object type
131 *
132 * Initializes a specific object type and links it into the object core
133 * framework.
134 *
135 * @param type Pointer to the object type to initialize
136 * @param id A means to identify the object type
137 * @param off Offset of object core within the structure
138 *
139 * @retval Pointer to initialized object type
140 */
141 struct k_obj_type *z_obj_type_init(struct k_obj_type *type,
142 uint32_t id, size_t off);
143
144 /**
145 * @brief Find a specific object type by ID
146 *
147 * Given an object type ID, this function searches for the object type that
148 * is associated with the specified type ID @a type_id.
149 *
150 * @param type_id Type ID associated with object type
151 *
152 * @retval NULL if object type not found
153 * @retval Pointer to object type if found
154 */
155 struct k_obj_type *k_obj_type_find(uint32_t type_id);
156
157 /**
158 * @brief Walk the object type's list of object cores
159 *
160 * This function takes a global spinlock and walks the object type's list
161 * of object cores and invokes the callback function on each element while
162 * holding that lock. Although this will ensure that the list is not modified,
163 * one can expect a significant penalty in terms of performance and latency.
164 *
165 * The callback function shall either return non-zero to stop further walking,
166 * or it shall return 0 to continue walking.
167 *
168 * @param type Pointer to the object type
169 * @param func Callback to invoke on each object core of the object type
170 * @param data Custom data passed to the callback
171 *
172 * @retval non-zero if walk is terminated by the callback; otherwise 0
173 */
174 int k_obj_type_walk_locked(struct k_obj_type *type,
175 int (*func)(struct k_obj_core *, void *),
176 void *data);
177
178 /**
179 * @brief Walk the object type's list of object cores
180 *
181 * This function is similar to k_obj_type_walk_locked() except that it walks
182 * the list without obtaining the global spinlock. No synchronization is
183 * provided here. Mutation of the list of objects while this function is in
184 * progress must be prevented at the application layer, otherwise
185 * undefined/unreliable behavior, corruption and/or crashes may result.
186 *
187 * The callback function shall either return non-zero to stop further walking,
188 * or it shall return 0 to continue walking.
189 *
190 * @param type Pointer to the object type
191 * @param func Callback to invoke on each object core of the object type
192 * @param data Custom data passed to the callback
193 *
194 * @retval non-zero if walk is terminated by the callback; otherwise 0
195 */
196 int k_obj_type_walk_unlocked(struct k_obj_type *type,
197 int (*func)(struct k_obj_core *, void *),
198 void *data);
199
200 /**
201 * @brief Initialize the core of the kernel object
202 *
203 * Initializing the kernel object core associates it with the specified
204 * kernel object type.
205 *
206 * @param obj_core Pointer to the kernel object to initialize
207 * @param type Pointer to the kernel object type
208 */
209 void k_obj_core_init(struct k_obj_core *obj_core, struct k_obj_type *type);
210
211 /**
212 * @brief Link the kernel object to the kernel object type list
213 *
214 * A kernel object can be optionally linked into the kernel object type's
215 * list of objects. A kernel object must have been initialized before it
216 * can be linked. Linked kernel objects can be traversed and have information
217 * extracted from them by system tools.
218 *
219 * @param obj_core Pointer to the kernel object
220 */
221 void k_obj_core_link(struct k_obj_core *obj_core);
222
223 /**
224 * @brief Automatically link the kernel object after initializing it
225 *
226 * A useful wrapper to both initialize the core of the kernel object and
227 * automatically link it into the kernel object type's list of objects.
228 *
229 * @param obj_core Pointer to the kernel object to initialize
230 * @param type Pointer to the kernel object type
231 */
232 void k_obj_core_init_and_link(struct k_obj_core *obj_core,
233 struct k_obj_type *type);
234
235 /**
236 * @brief Unlink the kernel object from the kernel object type list
237 *
238 * Kernel objects can be unlinked from their respective kernel object type
239 * lists. If on a list, it must be done at the end of the kernel object's life
240 * cycle.
241 *
242 * @param obj_core Pointer to the kernel object
243 */
244 void k_obj_core_unlink(struct k_obj_core *obj_core);
245
246 /** @} */
247
248 /**
249 * @defgroup obj_core_stats_apis Object Core Statistics APIs
250 * @ingroup kernel_apis
251 * @{
252 */
253
254 #ifdef CONFIG_OBJ_CORE_STATS
255 /**
256 * @brief Initialize the object type's stats descriptor
257 *
258 * This routine initializes the object type's stats descriptor.
259 *
260 * @param type Pointer to the object type
261 * @param stats_desc Pointer to the object core statistics descriptor
262 */
k_obj_type_stats_init(struct k_obj_type * type,struct k_obj_core_stats_desc * stats_desc)263 static inline void k_obj_type_stats_init(struct k_obj_type *type,
264 struct k_obj_core_stats_desc *stats_desc)
265 {
266 type->stats_desc = stats_desc;
267 }
268
269 /**
270 * @brief Initialize the object core for statistics
271 *
272 * This routine initializes the object core to operate within the object core
273 * statistics framework.
274 *
275 * @param obj_core Pointer to the object core
276 * @param stats Pointer to the object's raw statistics
277 */
k_obj_core_stats_init(struct k_obj_core * obj_core,void * stats)278 static inline void k_obj_core_stats_init(struct k_obj_core *obj_core,
279 void *stats)
280 {
281 obj_core->stats = stats;
282 }
283 #endif /* CONFIG_OBJ_CORE_STATS */
284
285 /**
286 * @brief Register kernel object for gathering statistics
287 *
288 * Before a kernel object can gather statistics, it must be registered to do
289 * so. Registering will also automatically enable the kernel object to gather
290 * its statistics.
291 *
292 * @param obj_core Pointer to kernel object core
293 * @param stats Pointer to raw kernel statistics
294 * @param stats_len Size of raw kernel statistics buffer
295 *
296 * @retval 0 on success
297 * @retval -errno on failure
298 */
299 int k_obj_core_stats_register(struct k_obj_core *obj_core, void *stats,
300 size_t stats_len);
301
302 /**
303 * @brief Deregister kernel object from gathering statistics
304 *
305 * Deregistering a kernel object core from gathering statistics prevents it
306 * from gathering any more statistics. It is expected to be invoked at the end
307 * of a kernel object's life cycle.
308 *
309 * @param obj_core Pointer to kernel object core
310 *
311 * @retval 0 on success
312 * @retval -errno on failure
313 */
314 int k_obj_core_stats_deregister(struct k_obj_core *obj_core);
315
316 /**
317 * @brief Retrieve the raw statistics associated with the kernel object
318 *
319 * This function copies the raw statistics associated with the kernel object
320 * core specified by @a obj_core into the buffer @a stats. Note that the size
321 * of the buffer (@a stats_len) must match the size specified by the kernel
322 * object type's statistics descriptor.
323 *
324 * @param obj_core Pointer to kernel object core
325 * @param stats Pointer to memory buffer into which to copy raw stats
326 * @param stats_len Length of the memory buffer
327 *
328 * @retval 0 on success
329 * @retval -errno on failure
330 */
331 int k_obj_core_stats_raw(struct k_obj_core *obj_core, void *stats,
332 size_t stats_len);
333
334 /**
335 * @brief Retrieve the statistics associated with the kernel object
336 *
337 * This function copies the statistics associated with the kernel object core
338 * specified by @a obj_core into the buffer @a stats. Unlike the raw statistics
339 * this may report calculated values such as averages. Note that the size of
340 * the buffer (@a stats_len) must match the size specified by the kernel object
341 * type's statistics descriptor.
342 *
343 * @param obj_core Pointer to kernel object core
344 * @param stats Pointer to memory buffer into which to copy the queried stats
345 * @param stats_len Length of the memory buffer
346 *
347 * @retval 0 on success
348 * @retval -errno on failure
349 */
350 int k_obj_core_stats_query(struct k_obj_core *obj_core, void *stats,
351 size_t stats_len);
352
353 /**
354 * @brief Reset the stats associated with the kernel object
355 *
356 * This function resets the statistics associated with the kernel object core
357 * specified by @a obj_core.
358 *
359 * @param obj_core Pointer to kernel object core
360 *
361 * @retval 0 on success
362 * @retval -errno on failure
363 */
364 int k_obj_core_stats_reset(struct k_obj_core *obj_core);
365
366 /**
367 * @brief Stop gathering the stats associated with the kernel object
368 *
369 * This function temporarily stops the gathering of statistics associated with
370 * the kernel object core specified by @a obj_core. The gathering of statistics
371 * can be resumed by invoking :c:func :`k_obj_core_stats_enable`.
372 *
373 * @param obj_core Pointer to kernel object core
374 *
375 * @retval 0 on success
376 * @retval -errno on failure
377 */
378 int k_obj_core_stats_disable(struct k_obj_core *obj_core);
379
380 /**
381 * @brief Reset the stats associated with the kernel object
382 *
383 * This function resumes the gathering of statistics associated with the kernel
384 * object core specified by @a obj_core.
385 *
386 * @param obj_core Pointer to kernel object core
387 *
388 * @retval 0 on success
389 * @retval -errno on failure
390 */
391 int k_obj_core_stats_enable(struct k_obj_core *obj_core);
392
393 /** @} */
394 #endif /* __KERNEL_OBJ_CORE_H__ */
395
