Commit | Line | Data |
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ef6695f1 MD |
1 | // SPDX-License-Identifier: MIT |
2 | // SPDX-FileCopyrightText: 2024 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
3 | ||
4 | #include <rseq/percpu-alloc.h> | |
5 | #include <sys/mman.h> | |
6 | #include <assert.h> | |
7 | #include <string.h> | |
8 | #include <pthread.h> | |
9 | #include <unistd.h> | |
10 | #include <stdlib.h> | |
11 | #include <rseq/compiler.h> | |
12 | #include <errno.h> | |
13 | #include <stdint.h> | |
14 | #include <stdbool.h> | |
367e559c MD |
15 | #include <stdio.h> |
16 | ||
17 | #ifdef HAVE_LIBNUMA | |
18 | # include <numa.h> | |
19 | # include <numaif.h> | |
20 | #endif | |
ef6695f1 | 21 | |
19be9217 MD |
22 | #include "rseq-alloc-utils.h" |
23 | ||
ef6695f1 | 24 | /* |
8ab16a24 | 25 | * rseq-percpu-alloc.c: rseq CPU-Local Storage (CLS) memory allocator. |
ef6695f1 | 26 | * |
8ab16a24 MD |
27 | * The rseq per-CPU memory allocator allows the application the request |
28 | * memory pools of CPU-Local memory each of containing objects of a | |
8aa1462d MD |
29 | * given size (rounded to next power of 2), reserving a given virtual |
30 | * address size per CPU, for a given maximum number of CPUs. | |
8ab16a24 MD |
31 | * |
32 | * The per-CPU memory allocator is analogous to TLS (Thread-Local | |
33 | * Storage) memory: TLS is Thread-Local Storage, whereas the per-CPU | |
34 | * memory allocator provides CPU-Local Storage. | |
ef6695f1 MD |
35 | */ |
36 | ||
72b100a1 | 37 | /* |
8ab16a24 | 38 | * Use high bits of per-CPU addresses to index the pool. |
72b100a1 MD |
39 | * This leaves the low bits of available to the application for pointer |
40 | * tagging (based on next power of 2 alignment of the allocations). | |
41 | */ | |
ef6695f1 | 42 | #if RSEQ_BITS_PER_LONG == 64 |
72b100a1 | 43 | # define POOL_INDEX_BITS 16 |
ef6695f1 | 44 | #else |
72b100a1 | 45 | # define POOL_INDEX_BITS 8 |
ef6695f1 | 46 | #endif |
72b100a1 MD |
47 | #define MAX_NR_POOLS (1UL << POOL_INDEX_BITS) |
48 | #define POOL_INDEX_SHIFT (RSEQ_BITS_PER_LONG - POOL_INDEX_BITS) | |
49 | #define MAX_POOL_LEN (1UL << POOL_INDEX_SHIFT) | |
50 | #define MAX_POOL_LEN_MASK (MAX_POOL_LEN - 1) | |
ef6695f1 | 51 | |
72b100a1 | 52 | #define POOL_SET_NR_ENTRIES POOL_INDEX_SHIFT |
ef6695f1 | 53 | |
72b100a1 MD |
54 | /* |
55 | * Smallest allocation should hold enough space for a free list pointer. | |
56 | */ | |
ef6695f1 MD |
57 | #if RSEQ_BITS_PER_LONG == 64 |
58 | # define POOL_SET_MIN_ENTRY 3 /* Smallest item_len=8 */ | |
59 | #else | |
60 | # define POOL_SET_MIN_ENTRY 2 /* Smallest item_len=4 */ | |
61 | #endif | |
62 | ||
bb1552e2 MD |
63 | /* |
64 | * Skip pool index 0 to ensure allocated entries at index 0 do not match | |
65 | * a NULL pointer. | |
66 | */ | |
67 | #define FIRST_POOL 1 | |
68 | ||
0fdf7a4c OD |
69 | #define RSEQ_POOL_FLAGS (RSEQ_POOL_ROBUST) |
70 | ||
71 | #define BIT_PER_ULONG (8 * sizeof(unsigned long)) | |
72 | ||
ef6695f1 MD |
73 | struct free_list_node; |
74 | ||
75 | struct free_list_node { | |
76 | struct free_list_node *next; | |
77 | }; | |
78 | ||
79 | /* This lock protects pool create/destroy. */ | |
80 | static pthread_mutex_t pool_lock = PTHREAD_MUTEX_INITIALIZER; | |
81 | ||
9bd07c29 MD |
82 | struct rseq_mmap_attr { |
83 | void *(*mmap_func)(void *priv, size_t len); | |
84 | int (*munmap_func)(void *priv, void *ptr, size_t len); | |
85 | void *mmap_priv; | |
86 | }; | |
87 | ||
ef6695f1 MD |
88 | struct rseq_percpu_pool { |
89 | void *base; | |
90 | unsigned int index; | |
91 | size_t item_len; | |
92 | size_t percpu_len; | |
93 | int item_order; | |
94 | int max_nr_cpus; | |
95 | ||
96 | /* | |
8ab16a24 | 97 | * The free list chains freed items on the CPU 0 address range. |
ef6695f1 | 98 | * We should rethink this decision if false sharing between |
8ab16a24 | 99 | * malloc/free from other CPUs and data accesses from CPU 0 |
ef6695f1 MD |
100 | * becomes an issue. This is a NULL-terminated singly-linked |
101 | * list. | |
102 | */ | |
103 | struct free_list_node *free_list_head; | |
104 | size_t next_unused; | |
105 | /* This lock protects allocation/free within the pool. */ | |
106 | pthread_mutex_t lock; | |
9bd07c29 MD |
107 | |
108 | struct rseq_mmap_attr mmap_attr; | |
0fdf7a4c | 109 | |
9649c7ee MD |
110 | /* Track alloc/free. */ |
111 | unsigned long *alloc_bitmap; | |
ef6695f1 MD |
112 | }; |
113 | ||
114 | //TODO: the array of pools should grow dynamically on create. | |
115 | static struct rseq_percpu_pool rseq_percpu_pool[MAX_NR_POOLS]; | |
116 | ||
117 | /* | |
118 | * Pool set entries are indexed by item_len rounded to the next power of | |
119 | * 2. A pool set can contain NULL pool entries, in which case the next | |
120 | * large enough entry will be used for allocation. | |
121 | */ | |
122 | struct rseq_percpu_pool_set { | |
123 | /* This lock protects add vs malloc/zmalloc within the pool set. */ | |
124 | pthread_mutex_t lock; | |
125 | struct rseq_percpu_pool *entries[POOL_SET_NR_ENTRIES]; | |
126 | }; | |
127 | ||
367e559c MD |
128 | static |
129 | void *__rseq_pool_percpu_ptr(struct rseq_percpu_pool *pool, int cpu, uintptr_t item_offset) | |
130 | { | |
131 | return pool->base + (pool->percpu_len * cpu) + item_offset; | |
132 | } | |
133 | ||
d24ee051 | 134 | void *__rseq_percpu_ptr(void __rseq_percpu *_ptr, int cpu) |
367e559c MD |
135 | { |
136 | uintptr_t ptr = (uintptr_t) _ptr; | |
72b100a1 MD |
137 | uintptr_t item_offset = ptr & MAX_POOL_LEN_MASK; |
138 | uintptr_t pool_index = ptr >> POOL_INDEX_SHIFT; | |
367e559c MD |
139 | struct rseq_percpu_pool *pool = &rseq_percpu_pool[pool_index]; |
140 | ||
141 | assert(cpu >= 0); | |
142 | return __rseq_pool_percpu_ptr(pool, cpu, item_offset); | |
143 | } | |
144 | ||
145 | static | |
146 | void rseq_percpu_zero_item(struct rseq_percpu_pool *pool, uintptr_t item_offset) | |
147 | { | |
148 | int i; | |
149 | ||
150 | for (i = 0; i < pool->max_nr_cpus; i++) { | |
151 | char *p = __rseq_pool_percpu_ptr(pool, i, item_offset); | |
152 | memset(p, 0, pool->item_len); | |
153 | } | |
154 | } | |
155 | ||
156 | #ifdef HAVE_LIBNUMA | |
9bd07c29 | 157 | int rseq_percpu_pool_init_numa(struct rseq_percpu_pool *pool, int numa_flags) |
367e559c MD |
158 | { |
159 | unsigned long nr_pages, page; | |
160 | long ret, page_len; | |
161 | int cpu; | |
162 | ||
163 | if (!numa_flags) | |
9bd07c29 | 164 | return 0; |
367e559c | 165 | page_len = rseq_get_page_len(); |
19be9217 | 166 | nr_pages = pool->percpu_len >> rseq_get_count_order_ulong(page_len); |
367e559c MD |
167 | for (cpu = 0; cpu < pool->max_nr_cpus; cpu++) { |
168 | int node = numa_node_of_cpu(cpu); | |
169 | ||
170 | /* TODO: batch move_pages() call with an array of pages. */ | |
171 | for (page = 0; page < nr_pages; page++) { | |
172 | void *pageptr = __rseq_pool_percpu_ptr(pool, cpu, page * page_len); | |
173 | int status = -EPERM; | |
174 | ||
175 | ret = move_pages(0, 1, &pageptr, &node, &status, numa_flags); | |
9bd07c29 MD |
176 | if (ret) |
177 | return ret; | |
367e559c MD |
178 | } |
179 | } | |
9bd07c29 | 180 | return 0; |
367e559c MD |
181 | } |
182 | #else | |
367e559c MD |
183 | void rseq_percpu_pool_init_numa(struct rseq_percpu_pool *pool __attribute__((unused)), |
184 | int numa_flags __attribute__((unused))) | |
185 | { | |
9bd07c29 | 186 | return 0; |
367e559c MD |
187 | } |
188 | #endif | |
189 | ||
9bd07c29 MD |
190 | static |
191 | void *default_mmap_func(void *priv __attribute__((unused)), size_t len) | |
192 | { | |
193 | void *base; | |
194 | ||
195 | base = mmap(NULL, len, PROT_READ | PROT_WRITE, | |
196 | MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); | |
197 | if (base == MAP_FAILED) | |
198 | return NULL; | |
199 | return base; | |
200 | } | |
201 | ||
202 | static | |
203 | int default_munmap_func(void *priv __attribute__((unused)), void *ptr, size_t len) | |
204 | { | |
205 | return munmap(ptr, len); | |
206 | } | |
207 | ||
0fdf7a4c | 208 | static |
9649c7ee | 209 | int create_alloc_bitmap(struct rseq_percpu_pool *pool) |
0fdf7a4c OD |
210 | { |
211 | size_t count; | |
212 | ||
9649c7ee | 213 | count = ((pool->percpu_len >> pool->item_order) + BIT_PER_ULONG - 1) / BIT_PER_ULONG; |
0fdf7a4c OD |
214 | |
215 | /* | |
9649c7ee MD |
216 | * Not being able to create the validation bitmap is an error |
217 | * that needs to be reported. | |
0fdf7a4c | 218 | */ |
9649c7ee MD |
219 | pool->alloc_bitmap = calloc(count, sizeof(unsigned long)); |
220 | if (!pool->alloc_bitmap) | |
221 | return -1; | |
222 | return 0; | |
0fdf7a4c OD |
223 | } |
224 | ||
225 | static | |
9649c7ee | 226 | void destroy_alloc_bitmap(struct rseq_percpu_pool *pool) |
0fdf7a4c | 227 | { |
9649c7ee | 228 | unsigned long *bitmap = pool->alloc_bitmap; |
9649c7ee | 229 | size_t count, total_leaks = 0; |
0fdf7a4c | 230 | |
9649c7ee | 231 | if (!bitmap) |
0fdf7a4c | 232 | return; |
0fdf7a4c | 233 | |
ed56a022 | 234 | count = ((pool->percpu_len >> pool->item_order) + BIT_PER_ULONG - 1) / BIT_PER_ULONG; |
0fdf7a4c OD |
235 | |
236 | /* Assert that all items in the pool were freed. */ | |
9649c7ee MD |
237 | for (size_t k = 0; k < count; ++k) |
238 | total_leaks += rseq_hweight_ulong(bitmap[k]); | |
239 | if (total_leaks) { | |
240 | fprintf(stderr, "%s: Pool has %zu leaked items on destroy.\n", __func__, | |
241 | total_leaks); | |
242 | abort(); | |
0fdf7a4c OD |
243 | } |
244 | ||
245 | free(bitmap); | |
246 | } | |
247 | ||
9649c7ee MD |
248 | static |
249 | int __rseq_percpu_pool_destroy(struct rseq_percpu_pool *pool) | |
250 | { | |
251 | int ret; | |
252 | ||
253 | if (!pool->base) { | |
254 | errno = ENOENT; | |
255 | ret = -1; | |
256 | goto end; | |
257 | } | |
258 | ret = pool->mmap_attr.munmap_func(pool->mmap_attr.mmap_priv, pool->base, | |
259 | pool->percpu_len * pool->max_nr_cpus); | |
260 | if (ret) | |
261 | goto end; | |
262 | pthread_mutex_destroy(&pool->lock); | |
263 | destroy_alloc_bitmap(pool); | |
264 | memset(pool, 0, sizeof(*pool)); | |
265 | end: | |
266 | return 0; | |
267 | } | |
268 | ||
269 | int rseq_percpu_pool_destroy(struct rseq_percpu_pool *pool) | |
270 | { | |
271 | int ret; | |
272 | ||
273 | pthread_mutex_lock(&pool_lock); | |
274 | ret = __rseq_percpu_pool_destroy(pool); | |
275 | pthread_mutex_unlock(&pool_lock); | |
276 | return ret; | |
277 | } | |
278 | ||
ef6695f1 MD |
279 | struct rseq_percpu_pool *rseq_percpu_pool_create(size_t item_len, |
280 | size_t percpu_len, int max_nr_cpus, | |
6b30db4e MD |
281 | const struct rseq_mmap_attr *mmap_attr, |
282 | int flags) | |
ef6695f1 | 283 | { |
9bd07c29 MD |
284 | void *(*mmap_func)(void *priv, size_t len); |
285 | int (*munmap_func)(void *priv, void *ptr, size_t len); | |
286 | void *mmap_priv; | |
ef6695f1 MD |
287 | struct rseq_percpu_pool *pool; |
288 | void *base; | |
289 | unsigned int i; | |
290 | int order; | |
ef6695f1 | 291 | |
0fdf7a4c | 292 | if (flags & ~RSEQ_POOL_FLAGS) { |
6b30db4e MD |
293 | errno = EINVAL; |
294 | return NULL; | |
295 | } | |
296 | ||
ef6695f1 MD |
297 | /* Make sure each item is large enough to contain free list pointers. */ |
298 | if (item_len < sizeof(void *)) | |
299 | item_len = sizeof(void *); | |
300 | ||
301 | /* Align item_len on next power of two. */ | |
19be9217 | 302 | order = rseq_get_count_order_ulong(item_len); |
ef6695f1 MD |
303 | if (order < 0) { |
304 | errno = EINVAL; | |
305 | return NULL; | |
306 | } | |
307 | item_len = 1UL << order; | |
308 | ||
309 | /* Align percpu_len on page size. */ | |
367e559c | 310 | percpu_len = rseq_align(percpu_len, rseq_get_page_len()); |
ef6695f1 MD |
311 | |
312 | if (max_nr_cpus < 0 || item_len > percpu_len || | |
72b100a1 | 313 | percpu_len > (UINTPTR_MAX >> POOL_INDEX_BITS)) { |
ef6695f1 MD |
314 | errno = EINVAL; |
315 | return NULL; | |
316 | } | |
317 | ||
9bd07c29 MD |
318 | if (mmap_attr) { |
319 | mmap_func = mmap_attr->mmap_func; | |
320 | munmap_func = mmap_attr->munmap_func; | |
321 | mmap_priv = mmap_attr->mmap_priv; | |
322 | } else { | |
323 | mmap_func = default_mmap_func; | |
324 | munmap_func = default_munmap_func; | |
325 | mmap_priv = NULL; | |
326 | } | |
ef6695f1 MD |
327 | pthread_mutex_lock(&pool_lock); |
328 | /* Linear scan in array of pools to find empty spot. */ | |
bb1552e2 | 329 | for (i = FIRST_POOL; i < MAX_NR_POOLS; i++) { |
ef6695f1 MD |
330 | pool = &rseq_percpu_pool[i]; |
331 | if (!pool->base) | |
332 | goto found_empty; | |
333 | } | |
334 | errno = ENOMEM; | |
335 | pool = NULL; | |
336 | goto end; | |
337 | ||
338 | found_empty: | |
9bd07c29 | 339 | base = mmap_func(mmap_priv, percpu_len * max_nr_cpus); |
9649c7ee MD |
340 | if (!base) |
341 | goto error_alloc; | |
ef6695f1 MD |
342 | pthread_mutex_init(&pool->lock, NULL); |
343 | pool->base = base; | |
344 | pool->percpu_len = percpu_len; | |
345 | pool->max_nr_cpus = max_nr_cpus; | |
346 | pool->index = i; | |
347 | pool->item_len = item_len; | |
348 | pool->item_order = order; | |
9bd07c29 MD |
349 | pool->mmap_attr.mmap_func = mmap_func; |
350 | pool->mmap_attr.munmap_func = munmap_func; | |
351 | pool->mmap_attr.mmap_priv = mmap_priv; | |
0fdf7a4c OD |
352 | |
353 | if (RSEQ_POOL_ROBUST & flags) { | |
9649c7ee MD |
354 | if (create_alloc_bitmap(pool)) |
355 | goto error_alloc; | |
0fdf7a4c | 356 | } |
ef6695f1 MD |
357 | end: |
358 | pthread_mutex_unlock(&pool_lock); | |
359 | return pool; | |
ef6695f1 | 360 | |
9649c7ee MD |
361 | error_alloc: |
362 | __rseq_percpu_pool_destroy(pool); | |
ef6695f1 | 363 | pthread_mutex_unlock(&pool_lock); |
9649c7ee MD |
364 | errno = ENOMEM; |
365 | return NULL; | |
ef6695f1 MD |
366 | } |
367 | ||
0fdf7a4c | 368 | static |
9649c7ee | 369 | void set_alloc_slot(struct rseq_percpu_pool *pool, size_t item_offset) |
0fdf7a4c | 370 | { |
9649c7ee MD |
371 | unsigned long *bitmap = pool->alloc_bitmap; |
372 | size_t item_index = item_offset >> pool->item_order; | |
0fdf7a4c OD |
373 | unsigned long mask; |
374 | size_t k; | |
375 | ||
9649c7ee | 376 | if (!bitmap) |
0fdf7a4c | 377 | return; |
0fdf7a4c | 378 | |
9649c7ee | 379 | k = item_index / BIT_PER_ULONG; |
0fdf7a4c OD |
380 | mask = 1ULL << (item_index % BIT_PER_ULONG); |
381 | ||
9649c7ee MD |
382 | /* Print error if bit is already set. */ |
383 | if (bitmap[k] & mask) { | |
384 | fprintf(stderr, "%s: Allocator corruption detected for pool %p, item offset %zu.", | |
385 | __func__, pool, item_offset); | |
386 | abort(); | |
387 | } | |
0fdf7a4c OD |
388 | bitmap[k] |= mask; |
389 | } | |
390 | ||
ef6695f1 | 391 | static |
d24ee051 | 392 | void __rseq_percpu *__rseq_percpu_malloc(struct rseq_percpu_pool *pool, bool zeroed) |
ef6695f1 MD |
393 | { |
394 | struct free_list_node *node; | |
395 | uintptr_t item_offset; | |
d24ee051 | 396 | void __rseq_percpu *addr; |
ef6695f1 MD |
397 | |
398 | pthread_mutex_lock(&pool->lock); | |
399 | /* Get first entry from free list. */ | |
400 | node = pool->free_list_head; | |
401 | if (node != NULL) { | |
402 | /* Remove node from free list (update head). */ | |
403 | pool->free_list_head = node->next; | |
404 | item_offset = (uintptr_t) ((void *) node - pool->base); | |
72b100a1 | 405 | addr = (void *) (((uintptr_t) pool->index << POOL_INDEX_SHIFT) | item_offset); |
ef6695f1 MD |
406 | goto end; |
407 | } | |
408 | if (pool->next_unused + pool->item_len > pool->percpu_len) { | |
ea1a3ada | 409 | errno = ENOMEM; |
ef6695f1 MD |
410 | addr = NULL; |
411 | goto end; | |
412 | } | |
413 | item_offset = pool->next_unused; | |
72b100a1 | 414 | addr = (void *) (((uintptr_t) pool->index << POOL_INDEX_SHIFT) | item_offset); |
ef6695f1 | 415 | pool->next_unused += pool->item_len; |
9649c7ee | 416 | set_alloc_slot(pool, item_offset); |
ef6695f1 MD |
417 | end: |
418 | pthread_mutex_unlock(&pool->lock); | |
419 | if (zeroed && addr) | |
420 | rseq_percpu_zero_item(pool, item_offset); | |
421 | return addr; | |
422 | } | |
423 | ||
d24ee051 | 424 | void __rseq_percpu *rseq_percpu_malloc(struct rseq_percpu_pool *pool) |
ef6695f1 MD |
425 | { |
426 | return __rseq_percpu_malloc(pool, false); | |
427 | } | |
428 | ||
d24ee051 | 429 | void __rseq_percpu *rseq_percpu_zmalloc(struct rseq_percpu_pool *pool) |
ef6695f1 MD |
430 | { |
431 | return __rseq_percpu_malloc(pool, true); | |
432 | } | |
433 | ||
0fdf7a4c | 434 | static |
9649c7ee | 435 | void clear_alloc_slot(struct rseq_percpu_pool *pool, size_t item_offset) |
0fdf7a4c | 436 | { |
9649c7ee MD |
437 | unsigned long *bitmap = pool->alloc_bitmap; |
438 | size_t item_index = item_offset >> pool->item_order; | |
0fdf7a4c OD |
439 | unsigned long mask; |
440 | size_t k; | |
441 | ||
9649c7ee | 442 | if (!bitmap) |
0fdf7a4c | 443 | return; |
0fdf7a4c | 444 | |
9649c7ee MD |
445 | k = item_index / BIT_PER_ULONG; |
446 | mask = 1ULL << (item_index % BIT_PER_ULONG); | |
0fdf7a4c | 447 | |
9649c7ee MD |
448 | /* Print error if bit is not set. */ |
449 | if (!(bitmap[k] & mask)) { | |
450 | fprintf(stderr, "%s: Double-free detected for pool %p, item offset %zu.", | |
451 | __func__, pool, item_offset); | |
452 | abort(); | |
453 | } | |
0fdf7a4c OD |
454 | bitmap[k] &= ~mask; |
455 | } | |
456 | ||
d24ee051 | 457 | void rseq_percpu_free(void __rseq_percpu *_ptr) |
ef6695f1 MD |
458 | { |
459 | uintptr_t ptr = (uintptr_t) _ptr; | |
72b100a1 MD |
460 | uintptr_t item_offset = ptr & MAX_POOL_LEN_MASK; |
461 | uintptr_t pool_index = ptr >> POOL_INDEX_SHIFT; | |
ef6695f1 MD |
462 | struct rseq_percpu_pool *pool = &rseq_percpu_pool[pool_index]; |
463 | struct free_list_node *head, *item; | |
464 | ||
465 | pthread_mutex_lock(&pool->lock); | |
9649c7ee | 466 | clear_alloc_slot(pool, item_offset); |
ef6695f1 MD |
467 | /* Add ptr to head of free list */ |
468 | head = pool->free_list_head; | |
8ab16a24 | 469 | /* Free-list is in CPU 0 range. */ |
ef6695f1 MD |
470 | item = (struct free_list_node *)__rseq_pool_percpu_ptr(pool, 0, item_offset); |
471 | item->next = head; | |
472 | pool->free_list_head = item; | |
473 | pthread_mutex_unlock(&pool->lock); | |
474 | } | |
475 | ||
476 | struct rseq_percpu_pool_set *rseq_percpu_pool_set_create(void) | |
477 | { | |
478 | struct rseq_percpu_pool_set *pool_set; | |
479 | ||
480 | pool_set = calloc(1, sizeof(struct rseq_percpu_pool_set)); | |
481 | if (!pool_set) | |
482 | return NULL; | |
483 | pthread_mutex_init(&pool_set->lock, NULL); | |
484 | return pool_set; | |
485 | } | |
486 | ||
487 | int rseq_percpu_pool_set_destroy(struct rseq_percpu_pool_set *pool_set) | |
488 | { | |
489 | int order, ret; | |
490 | ||
491 | for (order = POOL_SET_MIN_ENTRY; order < POOL_SET_NR_ENTRIES; order++) { | |
492 | struct rseq_percpu_pool *pool = pool_set->entries[order]; | |
493 | ||
494 | if (!pool) | |
495 | continue; | |
496 | ret = rseq_percpu_pool_destroy(pool); | |
497 | if (ret) | |
498 | return ret; | |
499 | pool_set->entries[order] = NULL; | |
500 | } | |
501 | pthread_mutex_destroy(&pool_set->lock); | |
502 | free(pool_set); | |
503 | return 0; | |
504 | } | |
505 | ||
506 | /* Ownership of pool is handed over to pool set on success. */ | |
507 | int rseq_percpu_pool_set_add_pool(struct rseq_percpu_pool_set *pool_set, struct rseq_percpu_pool *pool) | |
508 | { | |
509 | size_t item_order = pool->item_order; | |
510 | int ret = 0; | |
511 | ||
512 | pthread_mutex_lock(&pool_set->lock); | |
513 | if (pool_set->entries[item_order]) { | |
514 | errno = EBUSY; | |
515 | ret = -1; | |
516 | goto end; | |
517 | } | |
518 | pool_set->entries[pool->item_order] = pool; | |
519 | end: | |
520 | pthread_mutex_unlock(&pool_set->lock); | |
521 | return ret; | |
522 | } | |
523 | ||
524 | static | |
d24ee051 | 525 | void __rseq_percpu *__rseq_percpu_pool_set_malloc(struct rseq_percpu_pool_set *pool_set, size_t len, bool zeroed) |
ef6695f1 MD |
526 | { |
527 | int order, min_order = POOL_SET_MIN_ENTRY; | |
528 | struct rseq_percpu_pool *pool; | |
d24ee051 | 529 | void __rseq_percpu *addr; |
ef6695f1 | 530 | |
d06f5cf5 MD |
531 | order = rseq_get_count_order_ulong(len); |
532 | if (order > POOL_SET_MIN_ENTRY) | |
533 | min_order = order; | |
ef6695f1 MD |
534 | again: |
535 | pthread_mutex_lock(&pool_set->lock); | |
536 | /* First smallest present pool where @len fits. */ | |
537 | for (order = min_order; order < POOL_SET_NR_ENTRIES; order++) { | |
538 | pool = pool_set->entries[order]; | |
539 | ||
540 | if (!pool) | |
541 | continue; | |
542 | if (pool->item_len >= len) | |
543 | goto found; | |
544 | } | |
545 | pool = NULL; | |
546 | found: | |
547 | pthread_mutex_unlock(&pool_set->lock); | |
548 | if (pool) { | |
549 | addr = __rseq_percpu_malloc(pool, zeroed); | |
550 | if (addr == NULL && errno == ENOMEM) { | |
551 | /* | |
552 | * If the allocation failed, try again with a | |
553 | * larger pool. | |
554 | */ | |
555 | min_order = order + 1; | |
556 | goto again; | |
557 | } | |
558 | } else { | |
559 | /* Not found. */ | |
560 | errno = ENOMEM; | |
561 | addr = NULL; | |
562 | } | |
563 | return addr; | |
564 | } | |
565 | ||
d24ee051 | 566 | void __rseq_percpu *rseq_percpu_pool_set_malloc(struct rseq_percpu_pool_set *pool_set, size_t len) |
ef6695f1 MD |
567 | { |
568 | return __rseq_percpu_pool_set_malloc(pool_set, len, false); | |
569 | } | |
570 | ||
d24ee051 | 571 | void __rseq_percpu *rseq_percpu_pool_set_zmalloc(struct rseq_percpu_pool_set *pool_set, size_t len) |
ef6695f1 MD |
572 | { |
573 | return __rseq_percpu_pool_set_malloc(pool_set, len, true); | |
574 | } | |
9bd07c29 MD |
575 | |
576 | struct rseq_mmap_attr *rseq_mmap_attr_create(void *(*mmap_func)(void *priv, size_t len), | |
577 | int (*munmap_func)(void *priv, void *ptr, size_t len), | |
578 | void *mmap_priv) | |
579 | { | |
580 | struct rseq_mmap_attr *attr = calloc(1, sizeof(struct rseq_mmap_attr)); | |
581 | ||
582 | if (!attr) | |
583 | return NULL; | |
584 | attr->mmap_func = mmap_func; | |
585 | attr->munmap_func = munmap_func; | |
586 | attr->mmap_priv = mmap_priv; | |
587 | return attr; | |
588 | } | |
589 | ||
590 | void rseq_mmap_attr_destroy(struct rseq_mmap_attr *attr) | |
591 | { | |
592 | free(attr); | |
593 | } |