1 /*
2 * Copyright (c) 2016 Wind River Systems, Inc.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/kernel.h>
8 #include <zephyr/kernel_structs.h>
9
10 #include <zephyr/toolchain.h>
11 #include <zephyr/linker/sections.h>
12 #include <zephyr/sys/dlist.h>
13 #include <zephyr/init.h>
14 #include <zephyr/sys/check.h>
15 #include <zephyr/sys/iterable_sections.h>
16 #include <string.h>
17 /* private kernel APIs */
18 #include <ksched.h>
19 #include <wait_q.h>
20
21 #ifdef CONFIG_OBJ_CORE_MEM_SLAB
22 static struct k_obj_type obj_type_mem_slab;
23
24 #ifdef CONFIG_OBJ_CORE_STATS_MEM_SLAB
25
k_mem_slab_stats_raw(struct k_obj_core * obj_core,void * stats)26 static int k_mem_slab_stats_raw(struct k_obj_core *obj_core, void *stats)
27 {
28 __ASSERT((obj_core != NULL) && (stats != NULL), "NULL parameter");
29
30 struct k_mem_slab *slab;
31 k_spinlock_key_t key;
32
33 slab = CONTAINER_OF(obj_core, struct k_mem_slab, obj_core);
34 key = k_spin_lock(&slab->lock);
35 memcpy(stats, &slab->info, sizeof(slab->info));
36 k_spin_unlock(&slab->lock, key);
37
38 return 0;
39 }
40
k_mem_slab_stats_query(struct k_obj_core * obj_core,void * stats)41 static int k_mem_slab_stats_query(struct k_obj_core *obj_core, void *stats)
42 {
43 __ASSERT((obj_core != NULL) && (stats != NULL), "NULL parameter");
44
45 struct k_mem_slab *slab;
46 k_spinlock_key_t key;
47 struct sys_memory_stats *ptr = stats;
48
49 slab = CONTAINER_OF(obj_core, struct k_mem_slab, obj_core);
50 key = k_spin_lock(&slab->lock);
51 ptr->free_bytes = (slab->info.num_blocks - slab->info.num_used) *
52 slab->info.block_size;
53 ptr->allocated_bytes = slab->info.num_used * slab->info.block_size;
54 #ifdef CONFIG_MEM_SLAB_TRACE_MAX_UTILIZATION
55 ptr->max_allocated_bytes = slab->info.max_used * slab->info.block_size;
56 #else
57 ptr->max_allocated_bytes = 0;
58 #endif
59 k_spin_unlock(&slab->lock, key);
60
61 return 0;
62 }
63
k_mem_slab_stats_reset(struct k_obj_core * obj_core)64 static int k_mem_slab_stats_reset(struct k_obj_core *obj_core)
65 {
66 __ASSERT(obj_core != NULL, "NULL parameter");
67
68 struct k_mem_slab *slab;
69 k_spinlock_key_t key;
70
71 slab = CONTAINER_OF(obj_core, struct k_mem_slab, obj_core);
72 key = k_spin_lock(&slab->lock);
73
74 #ifdef CONFIG_MEM_SLAB_TRACE_MAX_UTILIZATION
75 slab->info.max_used = slab->info.num_used;
76 #endif
77
78 k_spin_unlock(&slab->lock, key);
79
80 return 0;
81 }
82
83 static struct k_obj_core_stats_desc mem_slab_stats_desc = {
84 .raw_size = sizeof(struct k_mem_slab_info),
85 .query_size = sizeof(struct sys_memory_stats),
86 .raw = k_mem_slab_stats_raw,
87 .query = k_mem_slab_stats_query,
88 .reset = k_mem_slab_stats_reset,
89 .disable = NULL,
90 .enable = NULL,
91 };
92 #endif
93 #endif
94
95 /**
96 * @brief Initialize kernel memory slab subsystem.
97 *
98 * Perform any initialization of memory slabs that wasn't done at build time.
99 * Currently this just involves creating the list of free blocks for each slab.
100 *
101 * @retval 0 on success.
102 * @retval -EINVAL if @p slab contains invalid configuration and/or values.
103 */
create_free_list(struct k_mem_slab * slab)104 static int create_free_list(struct k_mem_slab *slab)
105 {
106 uint32_t j;
107 char *p;
108
109 /* blocks must be word aligned */
110 CHECKIF(((slab->info.block_size | (uintptr_t)slab->buffer) &
111 (sizeof(void *) - 1)) != 0U) {
112 return -EINVAL;
113 }
114
115 slab->free_list = NULL;
116 p = slab->buffer;
117
118 for (j = 0U; j < slab->info.num_blocks; j++) {
119 *(char **)p = slab->free_list;
120 slab->free_list = p;
121 p += slab->info.block_size;
122 }
123 return 0;
124 }
125
126 /**
127 * @brief Complete initialization of statically defined memory slabs.
128 *
129 * Perform any initialization that wasn't done at build time.
130 *
131 * @return 0 on success, fails otherwise.
132 */
init_mem_slab_obj_core_list(void)133 static int init_mem_slab_obj_core_list(void)
134 {
135 int rc = 0;
136
137 /* Initialize mem_slab object type */
138
139 #ifdef CONFIG_OBJ_CORE_MEM_SLAB
140 z_obj_type_init(&obj_type_mem_slab, K_OBJ_TYPE_MEM_SLAB_ID,
141 offsetof(struct k_mem_slab, obj_core));
142 #ifdef CONFIG_OBJ_CORE_STATS_MEM_SLAB
143 k_obj_type_stats_init(&obj_type_mem_slab, &mem_slab_stats_desc);
144 #endif
145 #endif
146
147 /* Initialize statically defined mem_slabs */
148
149 STRUCT_SECTION_FOREACH(k_mem_slab, slab) {
150 rc = create_free_list(slab);
151 if (rc < 0) {
152 goto out;
153 }
154 k_object_init(slab);
155
156 #ifdef CONFIG_OBJ_CORE_MEM_SLAB
157 k_obj_core_init_and_link(K_OBJ_CORE(slab), &obj_type_mem_slab);
158 #ifdef CONFIG_OBJ_CORE_STATS_MEM_SLAB
159 k_obj_core_stats_register(K_OBJ_CORE(slab), &slab->info,
160 sizeof(struct k_mem_slab_info));
161 #endif
162 #endif
163 }
164
165 out:
166 return rc;
167 }
168
169 SYS_INIT(init_mem_slab_obj_core_list, PRE_KERNEL_1,
170 CONFIG_KERNEL_INIT_PRIORITY_OBJECTS);
171
k_mem_slab_init(struct k_mem_slab * slab,void * buffer,size_t block_size,uint32_t num_blocks)172 int k_mem_slab_init(struct k_mem_slab *slab, void *buffer,
173 size_t block_size, uint32_t num_blocks)
174 {
175 int rc = 0;
176
177 slab->info.num_blocks = num_blocks;
178 slab->info.block_size = block_size;
179 slab->buffer = buffer;
180 slab->info.num_used = 0U;
181 slab->lock = (struct k_spinlock) {};
182
183 #ifdef CONFIG_MEM_SLAB_TRACE_MAX_UTILIZATION
184 slab->info.max_used = 0U;
185 #endif
186
187 rc = create_free_list(slab);
188 if (rc < 0) {
189 goto out;
190 }
191
192 #ifdef CONFIG_OBJ_CORE_MEM_SLAB
193 k_obj_core_init_and_link(K_OBJ_CORE(slab), &obj_type_mem_slab);
194 #endif
195 #ifdef CONFIG_OBJ_CORE_STATS_MEM_SLAB
196 k_obj_core_stats_register(K_OBJ_CORE(slab), &slab->info,
197 sizeof(struct k_mem_slab_info));
198 #endif
199
200 z_waitq_init(&slab->wait_q);
201 k_object_init(slab);
202 out:
203 SYS_PORT_TRACING_OBJ_INIT(k_mem_slab, slab, rc);
204
205 return rc;
206 }
207
k_mem_slab_alloc(struct k_mem_slab * slab,void ** mem,k_timeout_t timeout)208 int k_mem_slab_alloc(struct k_mem_slab *slab, void **mem, k_timeout_t timeout)
209 {
210 k_spinlock_key_t key = k_spin_lock(&slab->lock);
211 int result;
212
213 SYS_PORT_TRACING_OBJ_FUNC_ENTER(k_mem_slab, alloc, slab, timeout);
214
215 if (slab->free_list != NULL) {
216 /* take a free block */
217 *mem = slab->free_list;
218 slab->free_list = *(char **)(slab->free_list);
219 slab->info.num_used++;
220
221 #ifdef CONFIG_MEM_SLAB_TRACE_MAX_UTILIZATION
222 slab->info.max_used = MAX(slab->info.num_used,
223 slab->info.max_used);
224 #endif
225
226 result = 0;
227 } else if (K_TIMEOUT_EQ(timeout, K_NO_WAIT) ||
228 !IS_ENABLED(CONFIG_MULTITHREADING)) {
229 /* don't wait for a free block to become available */
230 *mem = NULL;
231 result = -ENOMEM;
232 } else {
233 SYS_PORT_TRACING_OBJ_FUNC_BLOCKING(k_mem_slab, alloc, slab, timeout);
234
235 /* wait for a free block or timeout */
236 result = z_pend_curr(&slab->lock, key, &slab->wait_q, timeout);
237 if (result == 0) {
238 *mem = _current->base.swap_data;
239 }
240
241 SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_mem_slab, alloc, slab, timeout, result);
242
243 return result;
244 }
245
246 SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_mem_slab, alloc, slab, timeout, result);
247
248 k_spin_unlock(&slab->lock, key);
249
250 return result;
251 }
252
k_mem_slab_free(struct k_mem_slab * slab,void * mem)253 void k_mem_slab_free(struct k_mem_slab *slab, void *mem)
254 {
255 k_spinlock_key_t key = k_spin_lock(&slab->lock);
256
257 __ASSERT(((char *)mem >= slab->buffer) &&
258 ((((char *)mem - slab->buffer) % slab->info.block_size) == 0) &&
259 ((char *)mem <= (slab->buffer + (slab->info.block_size *
260 (slab->info.num_blocks - 1)))),
261 "Invalid memory pointer provided");
262
263 SYS_PORT_TRACING_OBJ_FUNC_ENTER(k_mem_slab, free, slab);
264 if (slab->free_list == NULL && IS_ENABLED(CONFIG_MULTITHREADING)) {
265 struct k_thread *pending_thread = z_unpend_first_thread(&slab->wait_q);
266
267 if (pending_thread != NULL) {
268 SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_mem_slab, free, slab);
269
270 z_thread_return_value_set_with_data(pending_thread, 0, mem);
271 z_ready_thread(pending_thread);
272 z_reschedule(&slab->lock, key);
273 return;
274 }
275 }
276 *(char **) mem = slab->free_list;
277 slab->free_list = (char *) mem;
278 slab->info.num_used--;
279
280 SYS_PORT_TRACING_OBJ_FUNC_EXIT(k_mem_slab, free, slab);
281
282 k_spin_unlock(&slab->lock, key);
283 }
284
k_mem_slab_runtime_stats_get(struct k_mem_slab * slab,struct sys_memory_stats * stats)285 int k_mem_slab_runtime_stats_get(struct k_mem_slab *slab, struct sys_memory_stats *stats)
286 {
287 if ((slab == NULL) || (stats == NULL)) {
288 return -EINVAL;
289 }
290
291 k_spinlock_key_t key = k_spin_lock(&slab->lock);
292
293 stats->allocated_bytes = slab->info.num_used * slab->info.block_size;
294 stats->free_bytes = (slab->info.num_blocks - slab->info.num_used) *
295 slab->info.block_size;
296 #ifdef CONFIG_MEM_SLAB_TRACE_MAX_UTILIZATION
297 stats->max_allocated_bytes = slab->info.max_used *
298 slab->info.block_size;
299 #else
300 stats->max_allocated_bytes = 0;
301 #endif
302
303 k_spin_unlock(&slab->lock, key);
304
305 return 0;
306 }
307
308 #ifdef CONFIG_MEM_SLAB_TRACE_MAX_UTILIZATION
k_mem_slab_runtime_stats_reset_max(struct k_mem_slab * slab)309 int k_mem_slab_runtime_stats_reset_max(struct k_mem_slab *slab)
310 {
311 if (slab == NULL) {
312 return -EINVAL;
313 }
314
315 k_spinlock_key_t key = k_spin_lock(&slab->lock);
316
317 slab->info.max_used = slab->info.num_used;
318
319 k_spin_unlock(&slab->lock, key);
320
321 return 0;
322 }
323 #endif
324
