1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * test_xarray.c: Test the XArray API 4 * Copyright (c) 2017-2018 Microsoft Corporation 5 * Copyright (c) 2019-2020 Oracle 6 * Author: Matthew Wilcox <willy@infradead.org> 7 */ 8 9 #include <linux/xarray.h> 10 #include <linux/module.h> 11 12 static unsigned int tests_run; 13 static unsigned int tests_passed; 14 15 static const unsigned int order_limit = 16 IS_ENABLED(CONFIG_XARRAY_MULTI) ? BITS_PER_LONG : 1; 17 18 #ifndef XA_DEBUG 19 # ifdef __KERNEL__ 20 void xa_dump(const struct xarray *xa) { } 21 # endif 22 #undef XA_BUG_ON 23 #define XA_BUG_ON(xa, x) do { \ 24 tests_run++; \ 25 if (x) { \ 26 printk("BUG at %s:%d\n", __func__, __LINE__); \ 27 xa_dump(xa); \ 28 dump_stack(); \ 29 } else { \ 30 tests_passed++; \ 31 } \ 32 } while (0) 33 #endif 34 35 static void *xa_mk_index(unsigned long index) 36 { 37 return xa_mk_value(index & LONG_MAX); 38 } 39 40 static void *xa_store_index(struct xarray *xa, unsigned long index, gfp_t gfp) 41 { 42 return xa_store(xa, index, xa_mk_index(index), gfp); 43 } 44 45 static void xa_insert_index(struct xarray *xa, unsigned long index) 46 { 47 XA_BUG_ON(xa, xa_insert(xa, index, xa_mk_index(index), 48 GFP_KERNEL) != 0); 49 } 50 51 static void xa_alloc_index(struct xarray *xa, unsigned long index, gfp_t gfp) 52 { 53 u32 id; 54 55 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(index), xa_limit_32b, 56 gfp) != 0); 57 XA_BUG_ON(xa, id != index); 58 } 59 60 static void xa_erase_index(struct xarray *xa, unsigned long index) 61 { 62 XA_BUG_ON(xa, xa_erase(xa, index) != xa_mk_index(index)); 63 XA_BUG_ON(xa, xa_load(xa, index) != NULL); 64 } 65 66 /* 67 * If anyone needs this, please move it to xarray.c. We have no current 68 * users outside the test suite because all current multislot users want 69 * to use the advanced API. 70 */ 71 static void *xa_store_order(struct xarray *xa, unsigned long index, 72 unsigned order, void *entry, gfp_t gfp) 73 { 74 XA_STATE_ORDER(xas, xa, index, order); 75 void *curr; 76 77 do { 78 xas_lock(&xas); 79 curr = xas_store(&xas, entry); 80 xas_unlock(&xas); 81 } while (xas_nomem(&xas, gfp)); 82 83 return curr; 84 } 85 86 static noinline void check_xa_err(struct xarray *xa) 87 { 88 XA_BUG_ON(xa, xa_err(xa_store_index(xa, 0, GFP_NOWAIT)) != 0); 89 XA_BUG_ON(xa, xa_err(xa_erase(xa, 0)) != 0); 90 #ifndef __KERNEL__ 91 /* The kernel does not fail GFP_NOWAIT allocations */ 92 XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM); 93 XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM); 94 #endif 95 XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_KERNEL)) != 0); 96 XA_BUG_ON(xa, xa_err(xa_store(xa, 1, xa_mk_value(0), GFP_KERNEL)) != 0); 97 XA_BUG_ON(xa, xa_err(xa_erase(xa, 1)) != 0); 98 // kills the test-suite :-( 99 // XA_BUG_ON(xa, xa_err(xa_store(xa, 0, xa_mk_internal(0), 0)) != -EINVAL); 100 } 101 102 static noinline void check_xas_retry(struct xarray *xa) 103 { 104 XA_STATE(xas, xa, 0); 105 void *entry; 106 107 xa_store_index(xa, 0, GFP_KERNEL); 108 xa_store_index(xa, 1, GFP_KERNEL); 109 110 rcu_read_lock(); 111 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_value(0)); 112 xa_erase_index(xa, 1); 113 XA_BUG_ON(xa, !xa_is_retry(xas_reload(&xas))); 114 XA_BUG_ON(xa, xas_retry(&xas, NULL)); 115 XA_BUG_ON(xa, xas_retry(&xas, xa_mk_value(0))); 116 xas_reset(&xas); 117 XA_BUG_ON(xa, xas.xa_node != XAS_RESTART); 118 XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0)); 119 XA_BUG_ON(xa, xas.xa_node != NULL); 120 rcu_read_unlock(); 121 122 XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL); 123 124 rcu_read_lock(); 125 XA_BUG_ON(xa, !xa_is_internal(xas_reload(&xas))); 126 xas.xa_node = XAS_RESTART; 127 XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0)); 128 rcu_read_unlock(); 129 130 /* Make sure we can iterate through retry entries */ 131 xas_lock(&xas); 132 xas_set(&xas, 0); 133 xas_store(&xas, XA_RETRY_ENTRY); 134 xas_set(&xas, 1); 135 xas_store(&xas, XA_RETRY_ENTRY); 136 137 xas_set(&xas, 0); 138 xas_for_each(&xas, entry, ULONG_MAX) { 139 xas_store(&xas, xa_mk_index(xas.xa_index)); 140 } 141 xas_unlock(&xas); 142 143 xa_erase_index(xa, 0); 144 xa_erase_index(xa, 1); 145 } 146 147 static noinline void check_xa_load(struct xarray *xa) 148 { 149 unsigned long i, j; 150 151 for (i = 0; i < 1024; i++) { 152 for (j = 0; j < 1024; j++) { 153 void *entry = xa_load(xa, j); 154 if (j < i) 155 XA_BUG_ON(xa, xa_to_value(entry) != j); 156 else 157 XA_BUG_ON(xa, entry); 158 } 159 XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL); 160 } 161 162 for (i = 0; i < 1024; i++) { 163 for (j = 0; j < 1024; j++) { 164 void *entry = xa_load(xa, j); 165 if (j >= i) 166 XA_BUG_ON(xa, xa_to_value(entry) != j); 167 else 168 XA_BUG_ON(xa, entry); 169 } 170 xa_erase_index(xa, i); 171 } 172 XA_BUG_ON(xa, !xa_empty(xa)); 173 } 174 175 static noinline void check_xa_mark_1(struct xarray *xa, unsigned long index) 176 { 177 unsigned int order; 178 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 8 : 1; 179 180 /* NULL elements have no marks set */ 181 XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0)); 182 xa_set_mark(xa, index, XA_MARK_0); 183 XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0)); 184 185 /* Storing a pointer will not make a mark appear */ 186 XA_BUG_ON(xa, xa_store_index(xa, index, GFP_KERNEL) != NULL); 187 XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0)); 188 xa_set_mark(xa, index, XA_MARK_0); 189 XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0)); 190 191 /* Setting one mark will not set another mark */ 192 XA_BUG_ON(xa, xa_get_mark(xa, index + 1, XA_MARK_0)); 193 XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_1)); 194 195 /* Storing NULL clears marks, and they can't be set again */ 196 xa_erase_index(xa, index); 197 XA_BUG_ON(xa, !xa_empty(xa)); 198 XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0)); 199 xa_set_mark(xa, index, XA_MARK_0); 200 XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0)); 201 202 /* 203 * Storing a multi-index entry over entries with marks gives the 204 * entire entry the union of the marks 205 */ 206 BUG_ON((index % 4) != 0); 207 for (order = 2; order < max_order; order++) { 208 unsigned long base = round_down(index, 1UL << order); 209 unsigned long next = base + (1UL << order); 210 unsigned long i; 211 212 XA_BUG_ON(xa, xa_store_index(xa, index + 1, GFP_KERNEL)); 213 xa_set_mark(xa, index + 1, XA_MARK_0); 214 XA_BUG_ON(xa, xa_store_index(xa, index + 2, GFP_KERNEL)); 215 xa_set_mark(xa, index + 2, XA_MARK_2); 216 XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL)); 217 xa_store_order(xa, index, order, xa_mk_index(index), 218 GFP_KERNEL); 219 for (i = base; i < next; i++) { 220 XA_STATE(xas, xa, i); 221 unsigned int seen = 0; 222 void *entry; 223 224 XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0)); 225 XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_1)); 226 XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_2)); 227 228 /* We should see two elements in the array */ 229 rcu_read_lock(); 230 xas_for_each(&xas, entry, ULONG_MAX) 231 seen++; 232 rcu_read_unlock(); 233 XA_BUG_ON(xa, seen != 2); 234 235 /* One of which is marked */ 236 xas_set(&xas, 0); 237 seen = 0; 238 rcu_read_lock(); 239 xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0) 240 seen++; 241 rcu_read_unlock(); 242 XA_BUG_ON(xa, seen != 1); 243 } 244 XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_0)); 245 XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_1)); 246 XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_2)); 247 xa_erase_index(xa, index); 248 xa_erase_index(xa, next); 249 XA_BUG_ON(xa, !xa_empty(xa)); 250 } 251 XA_BUG_ON(xa, !xa_empty(xa)); 252 } 253 254 static noinline void check_xa_mark_2(struct xarray *xa) 255 { 256 XA_STATE(xas, xa, 0); 257 unsigned long index; 258 unsigned int count = 0; 259 void *entry; 260 261 xa_store_index(xa, 0, GFP_KERNEL); 262 xa_set_mark(xa, 0, XA_MARK_0); 263 xas_lock(&xas); 264 xas_load(&xas); 265 xas_init_marks(&xas); 266 xas_unlock(&xas); 267 XA_BUG_ON(xa, !xa_get_mark(xa, 0, XA_MARK_0) == 0); 268 269 for (index = 3500; index < 4500; index++) { 270 xa_store_index(xa, index, GFP_KERNEL); 271 xa_set_mark(xa, index, XA_MARK_0); 272 } 273 274 xas_reset(&xas); 275 rcu_read_lock(); 276 xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0) 277 count++; 278 rcu_read_unlock(); 279 XA_BUG_ON(xa, count != 1000); 280 281 xas_lock(&xas); 282 xas_for_each(&xas, entry, ULONG_MAX) { 283 xas_init_marks(&xas); 284 XA_BUG_ON(xa, !xa_get_mark(xa, xas.xa_index, XA_MARK_0)); 285 XA_BUG_ON(xa, !xas_get_mark(&xas, XA_MARK_0)); 286 } 287 xas_unlock(&xas); 288 289 xa_destroy(xa); 290 } 291 292 static noinline void check_xa_mark_3(struct xarray *xa) 293 { 294 #ifdef CONFIG_XARRAY_MULTI 295 XA_STATE(xas, xa, 0x41); 296 void *entry; 297 int count = 0; 298 299 xa_store_order(xa, 0x40, 2, xa_mk_index(0x40), GFP_KERNEL); 300 xa_set_mark(xa, 0x41, XA_MARK_0); 301 302 rcu_read_lock(); 303 xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0) { 304 count++; 305 XA_BUG_ON(xa, entry != xa_mk_index(0x40)); 306 } 307 XA_BUG_ON(xa, count != 1); 308 rcu_read_unlock(); 309 xa_destroy(xa); 310 #endif 311 } 312 313 static noinline void check_xa_mark(struct xarray *xa) 314 { 315 unsigned long index; 316 317 for (index = 0; index < 16384; index += 4) 318 check_xa_mark_1(xa, index); 319 320 check_xa_mark_2(xa); 321 check_xa_mark_3(xa); 322 } 323 324 static noinline void check_xa_shrink(struct xarray *xa) 325 { 326 XA_STATE(xas, xa, 1); 327 struct xa_node *node; 328 unsigned int order; 329 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 15 : 1; 330 331 XA_BUG_ON(xa, !xa_empty(xa)); 332 XA_BUG_ON(xa, xa_store_index(xa, 0, GFP_KERNEL) != NULL); 333 XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL); 334 335 /* 336 * Check that erasing the entry at 1 shrinks the tree and properly 337 * marks the node as being deleted. 338 */ 339 xas_lock(&xas); 340 XA_BUG_ON(xa, xas_load(&xas) != xa_mk_value(1)); 341 node = xas.xa_node; 342 XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != xa_mk_value(0)); 343 XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1)); 344 XA_BUG_ON(xa, xa_load(xa, 1) != NULL); 345 XA_BUG_ON(xa, xas.xa_node != XAS_BOUNDS); 346 XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != XA_RETRY_ENTRY); 347 XA_BUG_ON(xa, xas_load(&xas) != NULL); 348 xas_unlock(&xas); 349 XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0)); 350 xa_erase_index(xa, 0); 351 XA_BUG_ON(xa, !xa_empty(xa)); 352 353 for (order = 0; order < max_order; order++) { 354 unsigned long max = (1UL << order) - 1; 355 xa_store_order(xa, 0, order, xa_mk_value(0), GFP_KERNEL); 356 XA_BUG_ON(xa, xa_load(xa, max) != xa_mk_value(0)); 357 XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL); 358 rcu_read_lock(); 359 node = xa_head(xa); 360 rcu_read_unlock(); 361 XA_BUG_ON(xa, xa_store_index(xa, ULONG_MAX, GFP_KERNEL) != 362 NULL); 363 rcu_read_lock(); 364 XA_BUG_ON(xa, xa_head(xa) == node); 365 rcu_read_unlock(); 366 XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL); 367 xa_erase_index(xa, ULONG_MAX); 368 XA_BUG_ON(xa, xa->xa_head != node); 369 xa_erase_index(xa, 0); 370 } 371 } 372 373 static noinline void check_insert(struct xarray *xa) 374 { 375 unsigned long i; 376 377 for (i = 0; i < 1024; i++) { 378 xa_insert_index(xa, i); 379 XA_BUG_ON(xa, xa_load(xa, i - 1) != NULL); 380 XA_BUG_ON(xa, xa_load(xa, i + 1) != NULL); 381 xa_erase_index(xa, i); 382 } 383 384 for (i = 10; i < BITS_PER_LONG; i++) { 385 xa_insert_index(xa, 1UL << i); 386 XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 1) != NULL); 387 XA_BUG_ON(xa, xa_load(xa, (1UL << i) + 1) != NULL); 388 xa_erase_index(xa, 1UL << i); 389 390 xa_insert_index(xa, (1UL << i) - 1); 391 XA_BUG_ON(xa, xa_load(xa, (1UL << i) - 2) != NULL); 392 XA_BUG_ON(xa, xa_load(xa, 1UL << i) != NULL); 393 xa_erase_index(xa, (1UL << i) - 1); 394 } 395 396 xa_insert_index(xa, ~0UL); 397 XA_BUG_ON(xa, xa_load(xa, 0UL) != NULL); 398 XA_BUG_ON(xa, xa_load(xa, ~1UL) != NULL); 399 xa_erase_index(xa, ~0UL); 400 401 XA_BUG_ON(xa, !xa_empty(xa)); 402 } 403 404 static noinline void check_cmpxchg(struct xarray *xa) 405 { 406 void *FIVE = xa_mk_value(5); 407 void *SIX = xa_mk_value(6); 408 void *LOTS = xa_mk_value(12345678); 409 410 XA_BUG_ON(xa, !xa_empty(xa)); 411 XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_KERNEL) != NULL); 412 XA_BUG_ON(xa, xa_insert(xa, 12345678, xa, GFP_KERNEL) != -EBUSY); 413 XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, SIX, FIVE, GFP_KERNEL) != LOTS); 414 XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, LOTS, FIVE, GFP_KERNEL) != LOTS); 415 XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, FIVE, LOTS, GFP_KERNEL) != FIVE); 416 XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != NULL); 417 XA_BUG_ON(xa, xa_cmpxchg(xa, 5, NULL, FIVE, GFP_KERNEL) != NULL); 418 XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) != -EBUSY); 419 XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != FIVE); 420 XA_BUG_ON(xa, xa_insert(xa, 5, FIVE, GFP_KERNEL) == -EBUSY); 421 xa_erase_index(xa, 12345678); 422 xa_erase_index(xa, 5); 423 XA_BUG_ON(xa, !xa_empty(xa)); 424 } 425 426 static noinline void check_cmpxchg_order(struct xarray *xa) 427 { 428 #ifdef CONFIG_XARRAY_MULTI 429 void *FIVE = xa_mk_value(5); 430 unsigned int i, order = 3; 431 432 XA_BUG_ON(xa, xa_store_order(xa, 0, order, FIVE, GFP_KERNEL)); 433 434 /* Check entry FIVE has the order saved */ 435 XA_BUG_ON(xa, xa_get_order(xa, xa_to_value(FIVE)) != order); 436 437 /* Check all the tied indexes have the same entry and order */ 438 for (i = 0; i < (1 << order); i++) { 439 XA_BUG_ON(xa, xa_load(xa, i) != FIVE); 440 XA_BUG_ON(xa, xa_get_order(xa, i) != order); 441 } 442 443 /* Ensure that nothing is stored at index '1 << order' */ 444 XA_BUG_ON(xa, xa_load(xa, 1 << order) != NULL); 445 446 /* 447 * Additionally, keep the node information and the order at 448 * '1 << order' 449 */ 450 XA_BUG_ON(xa, xa_store_order(xa, 1 << order, order, FIVE, GFP_KERNEL)); 451 for (i = (1 << order); i < (1 << order) + (1 << order) - 1; i++) { 452 XA_BUG_ON(xa, xa_load(xa, i) != FIVE); 453 XA_BUG_ON(xa, xa_get_order(xa, i) != order); 454 } 455 456 /* Conditionally replace FIVE entry at index '0' with NULL */ 457 XA_BUG_ON(xa, xa_cmpxchg(xa, 0, FIVE, NULL, GFP_KERNEL) != FIVE); 458 459 /* Verify the order is lost at FIVE (and old) entries */ 460 XA_BUG_ON(xa, xa_get_order(xa, xa_to_value(FIVE)) != 0); 461 462 /* Verify the order and entries are lost in all the tied indexes */ 463 for (i = 0; i < (1 << order); i++) { 464 XA_BUG_ON(xa, xa_load(xa, i) != NULL); 465 XA_BUG_ON(xa, xa_get_order(xa, i) != 0); 466 } 467 468 /* Verify node and order are kept at '1 << order' */ 469 for (i = (1 << order); i < (1 << order) + (1 << order) - 1; i++) { 470 XA_BUG_ON(xa, xa_load(xa, i) != FIVE); 471 XA_BUG_ON(xa, xa_get_order(xa, i) != order); 472 } 473 474 xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL); 475 XA_BUG_ON(xa, !xa_empty(xa)); 476 #endif 477 } 478 479 static noinline void check_reserve(struct xarray *xa) 480 { 481 void *entry; 482 unsigned long index; 483 int count; 484 485 /* An array with a reserved entry is not empty */ 486 XA_BUG_ON(xa, !xa_empty(xa)); 487 XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0); 488 XA_BUG_ON(xa, xa_empty(xa)); 489 XA_BUG_ON(xa, xa_load(xa, 12345678)); 490 xa_release(xa, 12345678); 491 XA_BUG_ON(xa, !xa_empty(xa)); 492 493 /* Releasing a used entry does nothing */ 494 XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0); 495 XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_NOWAIT) != NULL); 496 xa_release(xa, 12345678); 497 xa_erase_index(xa, 12345678); 498 XA_BUG_ON(xa, !xa_empty(xa)); 499 500 /* cmpxchg sees a reserved entry as ZERO */ 501 XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0); 502 XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, XA_ZERO_ENTRY, 503 xa_mk_value(12345678), GFP_NOWAIT) != NULL); 504 xa_release(xa, 12345678); 505 xa_erase_index(xa, 12345678); 506 XA_BUG_ON(xa, !xa_empty(xa)); 507 508 /* xa_insert treats it as busy */ 509 XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0); 510 XA_BUG_ON(xa, xa_insert(xa, 12345678, xa_mk_value(12345678), 0) != 511 -EBUSY); 512 XA_BUG_ON(xa, xa_empty(xa)); 513 XA_BUG_ON(xa, xa_erase(xa, 12345678) != NULL); 514 XA_BUG_ON(xa, !xa_empty(xa)); 515 516 /* Can iterate through a reserved entry */ 517 xa_store_index(xa, 5, GFP_KERNEL); 518 XA_BUG_ON(xa, xa_reserve(xa, 6, GFP_KERNEL) != 0); 519 xa_store_index(xa, 7, GFP_KERNEL); 520 521 count = 0; 522 xa_for_each(xa, index, entry) { 523 XA_BUG_ON(xa, index != 5 && index != 7); 524 count++; 525 } 526 XA_BUG_ON(xa, count != 2); 527 528 /* If we free a reserved entry, we should be able to allocate it */ 529 if (xa->xa_flags & XA_FLAGS_ALLOC) { 530 u32 id; 531 532 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(8), 533 XA_LIMIT(5, 10), GFP_KERNEL) != 0); 534 XA_BUG_ON(xa, id != 8); 535 536 xa_release(xa, 6); 537 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(6), 538 XA_LIMIT(5, 10), GFP_KERNEL) != 0); 539 XA_BUG_ON(xa, id != 6); 540 } 541 542 xa_destroy(xa); 543 } 544 545 static noinline void check_xas_erase(struct xarray *xa) 546 { 547 XA_STATE(xas, xa, 0); 548 void *entry; 549 unsigned long i, j; 550 551 for (i = 0; i < 200; i++) { 552 for (j = i; j < 2 * i + 17; j++) { 553 xas_set(&xas, j); 554 do { 555 xas_lock(&xas); 556 xas_store(&xas, xa_mk_index(j)); 557 xas_unlock(&xas); 558 } while (xas_nomem(&xas, GFP_KERNEL)); 559 } 560 561 xas_set(&xas, ULONG_MAX); 562 do { 563 xas_lock(&xas); 564 xas_store(&xas, xa_mk_value(0)); 565 xas_unlock(&xas); 566 } while (xas_nomem(&xas, GFP_KERNEL)); 567 568 xas_lock(&xas); 569 xas_store(&xas, NULL); 570 571 xas_set(&xas, 0); 572 j = i; 573 xas_for_each(&xas, entry, ULONG_MAX) { 574 XA_BUG_ON(xa, entry != xa_mk_index(j)); 575 xas_store(&xas, NULL); 576 j++; 577 } 578 xas_unlock(&xas); 579 XA_BUG_ON(xa, !xa_empty(xa)); 580 } 581 } 582 583 #ifdef CONFIG_XARRAY_MULTI 584 static noinline void check_multi_store_1(struct xarray *xa, unsigned long index, 585 unsigned int order) 586 { 587 XA_STATE(xas, xa, index); 588 unsigned long min = index & ~((1UL << order) - 1); 589 unsigned long max = min + (1UL << order); 590 591 xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL); 592 XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(index)); 593 XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(index)); 594 XA_BUG_ON(xa, xa_load(xa, max) != NULL); 595 XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL); 596 597 xas_lock(&xas); 598 XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(min)) != xa_mk_index(index)); 599 xas_unlock(&xas); 600 XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(min)); 601 XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(min)); 602 XA_BUG_ON(xa, xa_load(xa, max) != NULL); 603 XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL); 604 605 xa_erase_index(xa, min); 606 XA_BUG_ON(xa, !xa_empty(xa)); 607 } 608 609 static noinline void check_multi_store_2(struct xarray *xa, unsigned long index, 610 unsigned int order) 611 { 612 XA_STATE(xas, xa, index); 613 xa_store_order(xa, index, order, xa_mk_value(0), GFP_KERNEL); 614 615 xas_lock(&xas); 616 XA_BUG_ON(xa, xas_store(&xas, xa_mk_value(1)) != xa_mk_value(0)); 617 XA_BUG_ON(xa, xas.xa_index != index); 618 XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1)); 619 xas_unlock(&xas); 620 XA_BUG_ON(xa, !xa_empty(xa)); 621 } 622 623 static noinline void check_multi_store_3(struct xarray *xa, unsigned long index, 624 unsigned int order) 625 { 626 XA_STATE(xas, xa, 0); 627 void *entry; 628 int n = 0; 629 630 xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL); 631 632 xas_lock(&xas); 633 xas_for_each(&xas, entry, ULONG_MAX) { 634 XA_BUG_ON(xa, entry != xa_mk_index(index)); 635 n++; 636 } 637 XA_BUG_ON(xa, n != 1); 638 xas_set(&xas, index + 1); 639 xas_for_each(&xas, entry, ULONG_MAX) { 640 XA_BUG_ON(xa, entry != xa_mk_index(index)); 641 n++; 642 } 643 XA_BUG_ON(xa, n != 2); 644 xas_unlock(&xas); 645 646 xa_destroy(xa); 647 } 648 #endif 649 650 static noinline void check_multi_store(struct xarray *xa) 651 { 652 #ifdef CONFIG_XARRAY_MULTI 653 unsigned long i, j, k; 654 unsigned int max_order = (sizeof(long) == 4) ? 30 : 60; 655 656 /* Loading from any position returns the same value */ 657 xa_store_order(xa, 0, 1, xa_mk_value(0), GFP_KERNEL); 658 XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0)); 659 XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0)); 660 XA_BUG_ON(xa, xa_load(xa, 2) != NULL); 661 rcu_read_lock(); 662 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 2); 663 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2); 664 rcu_read_unlock(); 665 666 /* Storing adjacent to the value does not alter the value */ 667 xa_store(xa, 3, xa, GFP_KERNEL); 668 XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0)); 669 XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0)); 670 XA_BUG_ON(xa, xa_load(xa, 2) != NULL); 671 rcu_read_lock(); 672 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 3); 673 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2); 674 rcu_read_unlock(); 675 676 /* Overwriting multiple indexes works */ 677 xa_store_order(xa, 0, 2, xa_mk_value(1), GFP_KERNEL); 678 XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(1)); 679 XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(1)); 680 XA_BUG_ON(xa, xa_load(xa, 2) != xa_mk_value(1)); 681 XA_BUG_ON(xa, xa_load(xa, 3) != xa_mk_value(1)); 682 XA_BUG_ON(xa, xa_load(xa, 4) != NULL); 683 rcu_read_lock(); 684 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 4); 685 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 4); 686 rcu_read_unlock(); 687 688 /* We can erase multiple values with a single store */ 689 xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL); 690 XA_BUG_ON(xa, !xa_empty(xa)); 691 692 /* Even when the first slot is empty but the others aren't */ 693 xa_store_index(xa, 1, GFP_KERNEL); 694 xa_store_index(xa, 2, GFP_KERNEL); 695 xa_store_order(xa, 0, 2, NULL, GFP_KERNEL); 696 XA_BUG_ON(xa, !xa_empty(xa)); 697 698 for (i = 0; i < max_order; i++) { 699 for (j = 0; j < max_order; j++) { 700 xa_store_order(xa, 0, i, xa_mk_index(i), GFP_KERNEL); 701 xa_store_order(xa, 0, j, xa_mk_index(j), GFP_KERNEL); 702 703 for (k = 0; k < max_order; k++) { 704 void *entry = xa_load(xa, (1UL << k) - 1); 705 if ((i < k) && (j < k)) 706 XA_BUG_ON(xa, entry != NULL); 707 else 708 XA_BUG_ON(xa, entry != xa_mk_index(j)); 709 } 710 711 xa_erase(xa, 0); 712 XA_BUG_ON(xa, !xa_empty(xa)); 713 } 714 } 715 716 for (i = 0; i < 20; i++) { 717 check_multi_store_1(xa, 200, i); 718 check_multi_store_1(xa, 0, i); 719 check_multi_store_1(xa, (1UL << i) + 1, i); 720 } 721 check_multi_store_2(xa, 4095, 9); 722 723 for (i = 1; i < 20; i++) { 724 check_multi_store_3(xa, 0, i); 725 check_multi_store_3(xa, 1UL << i, i); 726 } 727 #endif 728 } 729 730 #ifdef CONFIG_XARRAY_MULTI 731 /* mimics page cache __filemap_add_folio() */ 732 static noinline void check_xa_multi_store_adv_add(struct xarray *xa, 733 unsigned long index, 734 unsigned int order, 735 void *p) 736 { 737 XA_STATE(xas, xa, index); 738 unsigned int nrpages = 1UL << order; 739 740 /* users are responsible for index alignemnt to the order when adding */ 741 XA_BUG_ON(xa, index & (nrpages - 1)); 742 743 xas_set_order(&xas, index, order); 744 745 do { 746 xas_lock_irq(&xas); 747 xas_store(&xas, p); 748 xas_unlock_irq(&xas); 749 /* 750 * In our selftest case the only failure we can expect is for 751 * there not to be enough memory as we're not mimicking the 752 * entire page cache, so verify that's the only error we can run 753 * into here. The xas_nomem() which follows will ensure to fix 754 * that condition for us so to chug on on the loop. 755 */ 756 XA_BUG_ON(xa, xas_error(&xas) && xas_error(&xas) != -ENOMEM); 757 } while (xas_nomem(&xas, GFP_KERNEL)); 758 759 XA_BUG_ON(xa, xas_error(&xas)); 760 XA_BUG_ON(xa, xa_load(xa, index) != p); 761 } 762 763 /* mimics page_cache_delete() */ 764 static noinline void check_xa_multi_store_adv_del_entry(struct xarray *xa, 765 unsigned long index, 766 unsigned int order) 767 { 768 XA_STATE(xas, xa, index); 769 770 xas_set_order(&xas, index, order); 771 xas_store(&xas, NULL); 772 xas_init_marks(&xas); 773 } 774 775 static noinline void check_xa_multi_store_adv_delete(struct xarray *xa, 776 unsigned long index, 777 unsigned int order) 778 { 779 xa_lock_irq(xa); 780 check_xa_multi_store_adv_del_entry(xa, index, order); 781 xa_unlock_irq(xa); 782 } 783 784 /* mimics page cache filemap_get_entry() */ 785 static noinline void *test_get_entry(struct xarray *xa, unsigned long index) 786 { 787 XA_STATE(xas, xa, index); 788 void *p; 789 static unsigned int loops = 0; 790 791 rcu_read_lock(); 792 repeat: 793 xas_reset(&xas); 794 p = xas_load(&xas); 795 if (xas_retry(&xas, p)) 796 goto repeat; 797 rcu_read_unlock(); 798 799 /* 800 * This is not part of the page cache, this selftest is pretty 801 * aggressive and does not want to trust the xarray API but rather 802 * test it, and for order 20 (4 GiB block size) we can loop over 803 * over a million entries which can cause a soft lockup. Page cache 804 * APIs won't be stupid, proper page cache APIs loop over the proper 805 * order so when using a larger order we skip shared entries. 806 */ 807 if (++loops % XA_CHECK_SCHED == 0) 808 schedule(); 809 810 return p; 811 } 812 813 static unsigned long some_val = 0xdeadbeef; 814 static unsigned long some_val_2 = 0xdeaddead; 815 816 /* mimics the page cache usage */ 817 static noinline void check_xa_multi_store_adv(struct xarray *xa, 818 unsigned long pos, 819 unsigned int order) 820 { 821 unsigned int nrpages = 1UL << order; 822 unsigned long index, base, next_index, next_next_index; 823 unsigned int i; 824 825 index = pos >> PAGE_SHIFT; 826 base = round_down(index, nrpages); 827 next_index = round_down(base + nrpages, nrpages); 828 next_next_index = round_down(next_index + nrpages, nrpages); 829 830 check_xa_multi_store_adv_add(xa, base, order, &some_val); 831 832 for (i = 0; i < nrpages; i++) 833 XA_BUG_ON(xa, test_get_entry(xa, base + i) != &some_val); 834 835 XA_BUG_ON(xa, test_get_entry(xa, next_index) != NULL); 836 837 /* Use order 0 for the next item */ 838 check_xa_multi_store_adv_add(xa, next_index, 0, &some_val_2); 839 XA_BUG_ON(xa, test_get_entry(xa, next_index) != &some_val_2); 840 841 /* Remove the next item */ 842 check_xa_multi_store_adv_delete(xa, next_index, 0); 843 844 /* Now use order for a new pointer */ 845 check_xa_multi_store_adv_add(xa, next_index, order, &some_val_2); 846 847 for (i = 0; i < nrpages; i++) 848 XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != &some_val_2); 849 850 check_xa_multi_store_adv_delete(xa, next_index, order); 851 check_xa_multi_store_adv_delete(xa, base, order); 852 XA_BUG_ON(xa, !xa_empty(xa)); 853 854 /* starting fresh again */ 855 856 /* let's test some holes now */ 857 858 /* hole at base and next_next */ 859 check_xa_multi_store_adv_add(xa, next_index, order, &some_val_2); 860 861 for (i = 0; i < nrpages; i++) 862 XA_BUG_ON(xa, test_get_entry(xa, base + i) != NULL); 863 864 for (i = 0; i < nrpages; i++) 865 XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != &some_val_2); 866 867 for (i = 0; i < nrpages; i++) 868 XA_BUG_ON(xa, test_get_entry(xa, next_next_index + i) != NULL); 869 870 check_xa_multi_store_adv_delete(xa, next_index, order); 871 XA_BUG_ON(xa, !xa_empty(xa)); 872 873 /* hole at base and next */ 874 875 check_xa_multi_store_adv_add(xa, next_next_index, order, &some_val_2); 876 877 for (i = 0; i < nrpages; i++) 878 XA_BUG_ON(xa, test_get_entry(xa, base + i) != NULL); 879 880 for (i = 0; i < nrpages; i++) 881 XA_BUG_ON(xa, test_get_entry(xa, next_index + i) != NULL); 882 883 for (i = 0; i < nrpages; i++) 884 XA_BUG_ON(xa, test_get_entry(xa, next_next_index + i) != &some_val_2); 885 886 check_xa_multi_store_adv_delete(xa, next_next_index, order); 887 XA_BUG_ON(xa, !xa_empty(xa)); 888 } 889 #endif 890 891 static noinline void check_multi_store_advanced(struct xarray *xa) 892 { 893 #ifdef CONFIG_XARRAY_MULTI 894 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1; 895 unsigned long end = ULONG_MAX/2; 896 unsigned long pos, i; 897 898 /* 899 * About 117 million tests below. 900 */ 901 for (pos = 7; pos < end; pos = (pos * pos) + 564) { 902 for (i = 0; i < max_order; i++) { 903 check_xa_multi_store_adv(xa, pos, i); 904 check_xa_multi_store_adv(xa, pos + 157, i); 905 } 906 } 907 #endif 908 } 909 910 static noinline void check_xa_alloc_1(struct xarray *xa, unsigned int base) 911 { 912 int i; 913 u32 id; 914 915 XA_BUG_ON(xa, !xa_empty(xa)); 916 /* An empty array should assign %base to the first alloc */ 917 xa_alloc_index(xa, base, GFP_KERNEL); 918 919 /* Erasing it should make the array empty again */ 920 xa_erase_index(xa, base); 921 XA_BUG_ON(xa, !xa_empty(xa)); 922 923 /* And it should assign %base again */ 924 xa_alloc_index(xa, base, GFP_KERNEL); 925 926 /* Allocating and then erasing a lot should not lose base */ 927 for (i = base + 1; i < 2 * XA_CHUNK_SIZE; i++) 928 xa_alloc_index(xa, i, GFP_KERNEL); 929 for (i = base; i < 2 * XA_CHUNK_SIZE; i++) 930 xa_erase_index(xa, i); 931 xa_alloc_index(xa, base, GFP_KERNEL); 932 933 /* Destroying the array should do the same as erasing */ 934 xa_destroy(xa); 935 936 /* And it should assign %base again */ 937 xa_alloc_index(xa, base, GFP_KERNEL); 938 939 /* The next assigned ID should be base+1 */ 940 xa_alloc_index(xa, base + 1, GFP_KERNEL); 941 xa_erase_index(xa, base + 1); 942 943 /* Storing a value should mark it used */ 944 xa_store_index(xa, base + 1, GFP_KERNEL); 945 xa_alloc_index(xa, base + 2, GFP_KERNEL); 946 947 /* If we then erase base, it should be free */ 948 xa_erase_index(xa, base); 949 xa_alloc_index(xa, base, GFP_KERNEL); 950 951 xa_erase_index(xa, base + 1); 952 xa_erase_index(xa, base + 2); 953 954 for (i = 1; i < 5000; i++) { 955 xa_alloc_index(xa, base + i, GFP_KERNEL); 956 } 957 958 xa_destroy(xa); 959 960 /* Check that we fail properly at the limit of allocation */ 961 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(UINT_MAX - 1), 962 XA_LIMIT(UINT_MAX - 1, UINT_MAX), 963 GFP_KERNEL) != 0); 964 XA_BUG_ON(xa, id != 0xfffffffeU); 965 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(UINT_MAX), 966 XA_LIMIT(UINT_MAX - 1, UINT_MAX), 967 GFP_KERNEL) != 0); 968 XA_BUG_ON(xa, id != 0xffffffffU); 969 id = 3; 970 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(0), 971 XA_LIMIT(UINT_MAX - 1, UINT_MAX), 972 GFP_KERNEL) != -EBUSY); 973 XA_BUG_ON(xa, id != 3); 974 xa_destroy(xa); 975 976 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(10), XA_LIMIT(10, 5), 977 GFP_KERNEL) != -EBUSY); 978 XA_BUG_ON(xa, xa_store_index(xa, 3, GFP_KERNEL) != 0); 979 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(10), XA_LIMIT(10, 5), 980 GFP_KERNEL) != -EBUSY); 981 xa_erase_index(xa, 3); 982 XA_BUG_ON(xa, !xa_empty(xa)); 983 } 984 985 static noinline void check_xa_alloc_2(struct xarray *xa, unsigned int base) 986 { 987 unsigned int i, id; 988 unsigned long index; 989 void *entry; 990 991 /* Allocate and free a NULL and check xa_empty() behaves */ 992 XA_BUG_ON(xa, !xa_empty(xa)); 993 XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0); 994 XA_BUG_ON(xa, id != base); 995 XA_BUG_ON(xa, xa_empty(xa)); 996 XA_BUG_ON(xa, xa_erase(xa, id) != NULL); 997 XA_BUG_ON(xa, !xa_empty(xa)); 998 999 /* Ditto, but check destroy instead of erase */ 1000 XA_BUG_ON(xa, !xa_empty(xa)); 1001 XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0); 1002 XA_BUG_ON(xa, id != base); 1003 XA_BUG_ON(xa, xa_empty(xa)); 1004 xa_destroy(xa); 1005 XA_BUG_ON(xa, !xa_empty(xa)); 1006 1007 for (i = base; i < base + 10; i++) { 1008 XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, 1009 GFP_KERNEL) != 0); 1010 XA_BUG_ON(xa, id != i); 1011 } 1012 1013 XA_BUG_ON(xa, xa_store(xa, 3, xa_mk_index(3), GFP_KERNEL) != NULL); 1014 XA_BUG_ON(xa, xa_store(xa, 4, xa_mk_index(4), GFP_KERNEL) != NULL); 1015 XA_BUG_ON(xa, xa_store(xa, 4, NULL, GFP_KERNEL) != xa_mk_index(4)); 1016 XA_BUG_ON(xa, xa_erase(xa, 5) != NULL); 1017 XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0); 1018 XA_BUG_ON(xa, id != 5); 1019 1020 xa_for_each(xa, index, entry) { 1021 xa_erase_index(xa, index); 1022 } 1023 1024 for (i = base; i < base + 9; i++) { 1025 XA_BUG_ON(xa, xa_erase(xa, i) != NULL); 1026 XA_BUG_ON(xa, xa_empty(xa)); 1027 } 1028 XA_BUG_ON(xa, xa_erase(xa, 8) != NULL); 1029 XA_BUG_ON(xa, xa_empty(xa)); 1030 XA_BUG_ON(xa, xa_erase(xa, base + 9) != NULL); 1031 XA_BUG_ON(xa, !xa_empty(xa)); 1032 1033 xa_destroy(xa); 1034 } 1035 1036 static noinline void check_xa_alloc_3(struct xarray *xa, unsigned int base) 1037 { 1038 struct xa_limit limit = XA_LIMIT(1, 0x3fff); 1039 u32 next = 0; 1040 unsigned int i, id; 1041 unsigned long index; 1042 void *entry; 1043 1044 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(1), limit, 1045 &next, GFP_KERNEL) != 0); 1046 XA_BUG_ON(xa, id != 1); 1047 1048 next = 0x3ffd; 1049 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(0x3ffd), limit, 1050 &next, GFP_KERNEL) != 0); 1051 XA_BUG_ON(xa, id != 0x3ffd); 1052 xa_erase_index(xa, 0x3ffd); 1053 xa_erase_index(xa, 1); 1054 XA_BUG_ON(xa, !xa_empty(xa)); 1055 1056 for (i = 0x3ffe; i < 0x4003; i++) { 1057 if (i < 0x4000) 1058 entry = xa_mk_index(i); 1059 else 1060 entry = xa_mk_index(i - 0x3fff); 1061 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, entry, limit, 1062 &next, GFP_KERNEL) != (id == 1)); 1063 XA_BUG_ON(xa, xa_mk_index(id) != entry); 1064 } 1065 1066 /* Check wrap-around is handled correctly */ 1067 if (base != 0) 1068 xa_erase_index(xa, base); 1069 xa_erase_index(xa, base + 1); 1070 next = UINT_MAX; 1071 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(UINT_MAX), 1072 xa_limit_32b, &next, GFP_KERNEL) != 0); 1073 XA_BUG_ON(xa, id != UINT_MAX); 1074 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(base), 1075 xa_limit_32b, &next, GFP_KERNEL) != 1); 1076 XA_BUG_ON(xa, id != base); 1077 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(base + 1), 1078 xa_limit_32b, &next, GFP_KERNEL) != 0); 1079 XA_BUG_ON(xa, id != base + 1); 1080 1081 xa_for_each(xa, index, entry) 1082 xa_erase_index(xa, index); 1083 1084 XA_BUG_ON(xa, !xa_empty(xa)); 1085 } 1086 1087 static DEFINE_XARRAY_ALLOC(xa0); 1088 static DEFINE_XARRAY_ALLOC1(xa1); 1089 1090 static noinline void check_xa_alloc(void) 1091 { 1092 check_xa_alloc_1(&xa0, 0); 1093 check_xa_alloc_1(&xa1, 1); 1094 check_xa_alloc_2(&xa0, 0); 1095 check_xa_alloc_2(&xa1, 1); 1096 check_xa_alloc_3(&xa0, 0); 1097 check_xa_alloc_3(&xa1, 1); 1098 } 1099 1100 static noinline void __check_store_iter(struct xarray *xa, unsigned long start, 1101 unsigned int order, unsigned int present) 1102 { 1103 XA_STATE_ORDER(xas, xa, start, order); 1104 void *entry; 1105 unsigned int count = 0; 1106 1107 retry: 1108 xas_lock(&xas); 1109 xas_for_each_conflict(&xas, entry) { 1110 XA_BUG_ON(xa, !xa_is_value(entry)); 1111 XA_BUG_ON(xa, entry < xa_mk_index(start)); 1112 XA_BUG_ON(xa, entry > xa_mk_index(start + (1UL << order) - 1)); 1113 count++; 1114 } 1115 xas_store(&xas, xa_mk_index(start)); 1116 xas_unlock(&xas); 1117 if (xas_nomem(&xas, GFP_KERNEL)) { 1118 count = 0; 1119 goto retry; 1120 } 1121 XA_BUG_ON(xa, xas_error(&xas)); 1122 XA_BUG_ON(xa, count != present); 1123 XA_BUG_ON(xa, xa_load(xa, start) != xa_mk_index(start)); 1124 XA_BUG_ON(xa, xa_load(xa, start + (1UL << order) - 1) != 1125 xa_mk_index(start)); 1126 xa_erase_index(xa, start); 1127 } 1128 1129 static noinline void check_store_iter(struct xarray *xa) 1130 { 1131 unsigned int i, j; 1132 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1; 1133 1134 for (i = 0; i < max_order; i++) { 1135 unsigned int min = 1 << i; 1136 unsigned int max = (2 << i) - 1; 1137 __check_store_iter(xa, 0, i, 0); 1138 XA_BUG_ON(xa, !xa_empty(xa)); 1139 __check_store_iter(xa, min, i, 0); 1140 XA_BUG_ON(xa, !xa_empty(xa)); 1141 1142 xa_store_index(xa, min, GFP_KERNEL); 1143 __check_store_iter(xa, min, i, 1); 1144 XA_BUG_ON(xa, !xa_empty(xa)); 1145 xa_store_index(xa, max, GFP_KERNEL); 1146 __check_store_iter(xa, min, i, 1); 1147 XA_BUG_ON(xa, !xa_empty(xa)); 1148 1149 for (j = 0; j < min; j++) 1150 xa_store_index(xa, j, GFP_KERNEL); 1151 __check_store_iter(xa, 0, i, min); 1152 XA_BUG_ON(xa, !xa_empty(xa)); 1153 for (j = 0; j < min; j++) 1154 xa_store_index(xa, min + j, GFP_KERNEL); 1155 __check_store_iter(xa, min, i, min); 1156 XA_BUG_ON(xa, !xa_empty(xa)); 1157 } 1158 #ifdef CONFIG_XARRAY_MULTI 1159 xa_store_index(xa, 63, GFP_KERNEL); 1160 xa_store_index(xa, 65, GFP_KERNEL); 1161 __check_store_iter(xa, 64, 2, 1); 1162 xa_erase_index(xa, 63); 1163 #endif 1164 XA_BUG_ON(xa, !xa_empty(xa)); 1165 } 1166 1167 static noinline void check_multi_find_1(struct xarray *xa, unsigned order) 1168 { 1169 #ifdef CONFIG_XARRAY_MULTI 1170 unsigned long multi = 3 << order; 1171 unsigned long next = 4 << order; 1172 unsigned long index; 1173 1174 xa_store_order(xa, multi, order, xa_mk_value(multi), GFP_KERNEL); 1175 XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL) != NULL); 1176 XA_BUG_ON(xa, xa_store_index(xa, next + 1, GFP_KERNEL) != NULL); 1177 1178 index = 0; 1179 XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) != 1180 xa_mk_value(multi)); 1181 XA_BUG_ON(xa, index != multi); 1182 index = multi + 1; 1183 XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) != 1184 xa_mk_value(multi)); 1185 XA_BUG_ON(xa, (index < multi) || (index >= next)); 1186 XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) != 1187 xa_mk_value(next)); 1188 XA_BUG_ON(xa, index != next); 1189 XA_BUG_ON(xa, xa_find_after(xa, &index, next, XA_PRESENT) != NULL); 1190 XA_BUG_ON(xa, index != next); 1191 1192 xa_erase_index(xa, multi); 1193 xa_erase_index(xa, next); 1194 xa_erase_index(xa, next + 1); 1195 XA_BUG_ON(xa, !xa_empty(xa)); 1196 #endif 1197 } 1198 1199 static noinline void check_multi_find_2(struct xarray *xa) 1200 { 1201 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 10 : 1; 1202 unsigned int i, j; 1203 void *entry; 1204 1205 for (i = 0; i < max_order; i++) { 1206 unsigned long index = 1UL << i; 1207 for (j = 0; j < index; j++) { 1208 XA_STATE(xas, xa, j + index); 1209 xa_store_index(xa, index - 1, GFP_KERNEL); 1210 xa_store_order(xa, index, i, xa_mk_index(index), 1211 GFP_KERNEL); 1212 rcu_read_lock(); 1213 xas_for_each(&xas, entry, ULONG_MAX) { 1214 xa_erase_index(xa, index); 1215 } 1216 rcu_read_unlock(); 1217 xa_erase_index(xa, index - 1); 1218 XA_BUG_ON(xa, !xa_empty(xa)); 1219 } 1220 } 1221 } 1222 1223 static noinline void check_multi_find_3(struct xarray *xa) 1224 { 1225 unsigned int order; 1226 1227 for (order = 5; order < order_limit; order++) { 1228 unsigned long index = 1UL << (order - 5); 1229 1230 XA_BUG_ON(xa, !xa_empty(xa)); 1231 xa_store_order(xa, 0, order - 4, xa_mk_index(0), GFP_KERNEL); 1232 XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT)); 1233 xa_erase_index(xa, 0); 1234 } 1235 } 1236 1237 static noinline void check_find_1(struct xarray *xa) 1238 { 1239 unsigned long i, j, k; 1240 1241 XA_BUG_ON(xa, !xa_empty(xa)); 1242 1243 /* 1244 * Check xa_find with all pairs between 0 and 99 inclusive, 1245 * starting at every index between 0 and 99 1246 */ 1247 for (i = 0; i < 100; i++) { 1248 XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL); 1249 xa_set_mark(xa, i, XA_MARK_0); 1250 for (j = 0; j < i; j++) { 1251 XA_BUG_ON(xa, xa_store_index(xa, j, GFP_KERNEL) != 1252 NULL); 1253 xa_set_mark(xa, j, XA_MARK_0); 1254 for (k = 0; k < 100; k++) { 1255 unsigned long index = k; 1256 void *entry = xa_find(xa, &index, ULONG_MAX, 1257 XA_PRESENT); 1258 if (k <= j) 1259 XA_BUG_ON(xa, index != j); 1260 else if (k <= i) 1261 XA_BUG_ON(xa, index != i); 1262 else 1263 XA_BUG_ON(xa, entry != NULL); 1264 1265 index = k; 1266 entry = xa_find(xa, &index, ULONG_MAX, 1267 XA_MARK_0); 1268 if (k <= j) 1269 XA_BUG_ON(xa, index != j); 1270 else if (k <= i) 1271 XA_BUG_ON(xa, index != i); 1272 else 1273 XA_BUG_ON(xa, entry != NULL); 1274 } 1275 xa_erase_index(xa, j); 1276 XA_BUG_ON(xa, xa_get_mark(xa, j, XA_MARK_0)); 1277 XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0)); 1278 } 1279 xa_erase_index(xa, i); 1280 XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_0)); 1281 } 1282 XA_BUG_ON(xa, !xa_empty(xa)); 1283 } 1284 1285 static noinline void check_find_2(struct xarray *xa) 1286 { 1287 void *entry; 1288 unsigned long i, j, index; 1289 1290 xa_for_each(xa, index, entry) { 1291 XA_BUG_ON(xa, true); 1292 } 1293 1294 for (i = 0; i < 1024; i++) { 1295 xa_store_index(xa, index, GFP_KERNEL); 1296 j = 0; 1297 xa_for_each(xa, index, entry) { 1298 XA_BUG_ON(xa, xa_mk_index(index) != entry); 1299 XA_BUG_ON(xa, index != j++); 1300 } 1301 } 1302 1303 xa_destroy(xa); 1304 } 1305 1306 static noinline void check_find_3(struct xarray *xa) 1307 { 1308 XA_STATE(xas, xa, 0); 1309 unsigned long i, j, k; 1310 void *entry; 1311 1312 for (i = 0; i < 100; i++) { 1313 for (j = 0; j < 100; j++) { 1314 rcu_read_lock(); 1315 for (k = 0; k < 100; k++) { 1316 xas_set(&xas, j); 1317 xas_for_each_marked(&xas, entry, k, XA_MARK_0) 1318 ; 1319 if (j > k) 1320 XA_BUG_ON(xa, 1321 xas.xa_node != XAS_RESTART); 1322 } 1323 rcu_read_unlock(); 1324 } 1325 xa_store_index(xa, i, GFP_KERNEL); 1326 xa_set_mark(xa, i, XA_MARK_0); 1327 } 1328 xa_destroy(xa); 1329 } 1330 1331 static noinline void check_find_4(struct xarray *xa) 1332 { 1333 unsigned long index = 0; 1334 void *entry; 1335 1336 xa_store_index(xa, ULONG_MAX, GFP_KERNEL); 1337 1338 entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT); 1339 XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX)); 1340 1341 entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT); 1342 XA_BUG_ON(xa, entry); 1343 1344 xa_erase_index(xa, ULONG_MAX); 1345 } 1346 1347 static noinline void check_find(struct xarray *xa) 1348 { 1349 unsigned i; 1350 1351 check_find_1(xa); 1352 check_find_2(xa); 1353 check_find_3(xa); 1354 check_find_4(xa); 1355 1356 for (i = 2; i < 10; i++) 1357 check_multi_find_1(xa, i); 1358 check_multi_find_2(xa); 1359 check_multi_find_3(xa); 1360 } 1361 1362 /* See find_swap_entry() in mm/shmem.c */ 1363 static noinline unsigned long xa_find_entry(struct xarray *xa, void *item) 1364 { 1365 XA_STATE(xas, xa, 0); 1366 unsigned int checked = 0; 1367 void *entry; 1368 1369 rcu_read_lock(); 1370 xas_for_each(&xas, entry, ULONG_MAX) { 1371 if (xas_retry(&xas, entry)) 1372 continue; 1373 if (entry == item) 1374 break; 1375 checked++; 1376 if ((checked % 4) != 0) 1377 continue; 1378 xas_pause(&xas); 1379 } 1380 rcu_read_unlock(); 1381 1382 return entry ? xas.xa_index : -1; 1383 } 1384 1385 static noinline void check_find_entry(struct xarray *xa) 1386 { 1387 #ifdef CONFIG_XARRAY_MULTI 1388 unsigned int order; 1389 unsigned long offset, index; 1390 1391 for (order = 0; order < 20; order++) { 1392 for (offset = 0; offset < (1UL << (order + 3)); 1393 offset += (1UL << order)) { 1394 for (index = 0; index < (1UL << (order + 5)); 1395 index += (1UL << order)) { 1396 xa_store_order(xa, index, order, 1397 xa_mk_index(index), GFP_KERNEL); 1398 XA_BUG_ON(xa, xa_load(xa, index) != 1399 xa_mk_index(index)); 1400 XA_BUG_ON(xa, xa_find_entry(xa, 1401 xa_mk_index(index)) != index); 1402 } 1403 XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1); 1404 xa_destroy(xa); 1405 } 1406 } 1407 #endif 1408 1409 XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1); 1410 xa_store_index(xa, ULONG_MAX, GFP_KERNEL); 1411 XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1); 1412 XA_BUG_ON(xa, xa_find_entry(xa, xa_mk_index(ULONG_MAX)) != -1); 1413 xa_erase_index(xa, ULONG_MAX); 1414 XA_BUG_ON(xa, !xa_empty(xa)); 1415 } 1416 1417 static noinline void check_pause(struct xarray *xa) 1418 { 1419 XA_STATE(xas, xa, 0); 1420 void *entry; 1421 unsigned int order; 1422 unsigned long index = 1; 1423 unsigned int count = 0; 1424 1425 for (order = 0; order < order_limit; order++) { 1426 XA_BUG_ON(xa, xa_store_order(xa, index, order, 1427 xa_mk_index(index), GFP_KERNEL)); 1428 index += 1UL << order; 1429 } 1430 1431 rcu_read_lock(); 1432 xas_for_each(&xas, entry, ULONG_MAX) { 1433 XA_BUG_ON(xa, entry != xa_mk_index(1UL << count)); 1434 count++; 1435 } 1436 rcu_read_unlock(); 1437 XA_BUG_ON(xa, count != order_limit); 1438 1439 count = 0; 1440 xas_set(&xas, 0); 1441 rcu_read_lock(); 1442 xas_for_each(&xas, entry, ULONG_MAX) { 1443 XA_BUG_ON(xa, entry != xa_mk_index(1UL << count)); 1444 count++; 1445 xas_pause(&xas); 1446 } 1447 rcu_read_unlock(); 1448 XA_BUG_ON(xa, count != order_limit); 1449 1450 xa_destroy(xa); 1451 1452 index = 0; 1453 for (order = XA_CHUNK_SHIFT; order > 0; order--) { 1454 XA_BUG_ON(xa, xa_store_order(xa, index, order, 1455 xa_mk_index(index), GFP_KERNEL)); 1456 index += 1UL << order; 1457 } 1458 1459 index = 0; 1460 count = 0; 1461 xas_set(&xas, 0); 1462 rcu_read_lock(); 1463 xas_for_each(&xas, entry, ULONG_MAX) { 1464 XA_BUG_ON(xa, entry != xa_mk_index(index)); 1465 index += 1UL << (XA_CHUNK_SHIFT - count); 1466 count++; 1467 } 1468 rcu_read_unlock(); 1469 XA_BUG_ON(xa, count != XA_CHUNK_SHIFT); 1470 1471 index = 0; 1472 count = 0; 1473 xas_set(&xas, XA_CHUNK_SIZE / 2 + 1); 1474 rcu_read_lock(); 1475 xas_for_each(&xas, entry, ULONG_MAX) { 1476 XA_BUG_ON(xa, entry != xa_mk_index(index)); 1477 index += 1UL << (XA_CHUNK_SHIFT - count); 1478 count++; 1479 xas_pause(&xas); 1480 } 1481 rcu_read_unlock(); 1482 XA_BUG_ON(xa, count != XA_CHUNK_SHIFT); 1483 1484 xa_destroy(xa); 1485 1486 } 1487 1488 static noinline void check_move_tiny(struct xarray *xa) 1489 { 1490 XA_STATE(xas, xa, 0); 1491 1492 XA_BUG_ON(xa, !xa_empty(xa)); 1493 rcu_read_lock(); 1494 XA_BUG_ON(xa, xas_next(&xas) != NULL); 1495 XA_BUG_ON(xa, xas_next(&xas) != NULL); 1496 rcu_read_unlock(); 1497 xa_store_index(xa, 0, GFP_KERNEL); 1498 rcu_read_lock(); 1499 xas_set(&xas, 0); 1500 XA_BUG_ON(xa, xas_next(&xas) != xa_mk_index(0)); 1501 XA_BUG_ON(xa, xas_next(&xas) != NULL); 1502 xas_set(&xas, 0); 1503 XA_BUG_ON(xa, xas_prev(&xas) != xa_mk_index(0)); 1504 XA_BUG_ON(xa, xas_prev(&xas) != NULL); 1505 rcu_read_unlock(); 1506 xa_erase_index(xa, 0); 1507 XA_BUG_ON(xa, !xa_empty(xa)); 1508 } 1509 1510 static noinline void check_move_max(struct xarray *xa) 1511 { 1512 XA_STATE(xas, xa, 0); 1513 1514 xa_store_index(xa, ULONG_MAX, GFP_KERNEL); 1515 rcu_read_lock(); 1516 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_index(ULONG_MAX)); 1517 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != NULL); 1518 rcu_read_unlock(); 1519 1520 xas_set(&xas, 0); 1521 rcu_read_lock(); 1522 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_index(ULONG_MAX)); 1523 xas_pause(&xas); 1524 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != NULL); 1525 rcu_read_unlock(); 1526 1527 xa_erase_index(xa, ULONG_MAX); 1528 XA_BUG_ON(xa, !xa_empty(xa)); 1529 } 1530 1531 static noinline void check_move_small(struct xarray *xa, unsigned long idx) 1532 { 1533 XA_STATE(xas, xa, 0); 1534 unsigned long i; 1535 1536 xa_store_index(xa, 0, GFP_KERNEL); 1537 xa_store_index(xa, idx, GFP_KERNEL); 1538 1539 rcu_read_lock(); 1540 for (i = 0; i < idx * 4; i++) { 1541 void *entry = xas_next(&xas); 1542 if (i <= idx) 1543 XA_BUG_ON(xa, xas.xa_node == XAS_RESTART); 1544 XA_BUG_ON(xa, xas.xa_index != i); 1545 if (i == 0 || i == idx) 1546 XA_BUG_ON(xa, entry != xa_mk_index(i)); 1547 else 1548 XA_BUG_ON(xa, entry != NULL); 1549 } 1550 xas_next(&xas); 1551 XA_BUG_ON(xa, xas.xa_index != i); 1552 1553 do { 1554 void *entry = xas_prev(&xas); 1555 i--; 1556 if (i <= idx) 1557 XA_BUG_ON(xa, xas.xa_node == XAS_RESTART); 1558 XA_BUG_ON(xa, xas.xa_index != i); 1559 if (i == 0 || i == idx) 1560 XA_BUG_ON(xa, entry != xa_mk_index(i)); 1561 else 1562 XA_BUG_ON(xa, entry != NULL); 1563 } while (i > 0); 1564 1565 xas_set(&xas, ULONG_MAX); 1566 XA_BUG_ON(xa, xas_next(&xas) != NULL); 1567 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX); 1568 XA_BUG_ON(xa, xas_next(&xas) != xa_mk_value(0)); 1569 XA_BUG_ON(xa, xas.xa_index != 0); 1570 XA_BUG_ON(xa, xas_prev(&xas) != NULL); 1571 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX); 1572 rcu_read_unlock(); 1573 1574 xa_erase_index(xa, 0); 1575 xa_erase_index(xa, idx); 1576 XA_BUG_ON(xa, !xa_empty(xa)); 1577 } 1578 1579 static noinline void check_move(struct xarray *xa) 1580 { 1581 XA_STATE(xas, xa, (1 << 16) - 1); 1582 unsigned long i; 1583 1584 for (i = 0; i < (1 << 16); i++) 1585 XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL); 1586 1587 rcu_read_lock(); 1588 do { 1589 void *entry = xas_prev(&xas); 1590 i--; 1591 XA_BUG_ON(xa, entry != xa_mk_index(i)); 1592 XA_BUG_ON(xa, i != xas.xa_index); 1593 } while (i != 0); 1594 1595 XA_BUG_ON(xa, xas_prev(&xas) != NULL); 1596 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX); 1597 1598 do { 1599 void *entry = xas_next(&xas); 1600 XA_BUG_ON(xa, entry != xa_mk_index(i)); 1601 XA_BUG_ON(xa, i != xas.xa_index); 1602 i++; 1603 } while (i < (1 << 16)); 1604 rcu_read_unlock(); 1605 1606 for (i = (1 << 8); i < (1 << 15); i++) 1607 xa_erase_index(xa, i); 1608 1609 i = xas.xa_index; 1610 1611 rcu_read_lock(); 1612 do { 1613 void *entry = xas_prev(&xas); 1614 i--; 1615 if ((i < (1 << 8)) || (i >= (1 << 15))) 1616 XA_BUG_ON(xa, entry != xa_mk_index(i)); 1617 else 1618 XA_BUG_ON(xa, entry != NULL); 1619 XA_BUG_ON(xa, i != xas.xa_index); 1620 } while (i != 0); 1621 1622 XA_BUG_ON(xa, xas_prev(&xas) != NULL); 1623 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX); 1624 1625 do { 1626 void *entry = xas_next(&xas); 1627 if ((i < (1 << 8)) || (i >= (1 << 15))) 1628 XA_BUG_ON(xa, entry != xa_mk_index(i)); 1629 else 1630 XA_BUG_ON(xa, entry != NULL); 1631 XA_BUG_ON(xa, i != xas.xa_index); 1632 i++; 1633 } while (i < (1 << 16)); 1634 rcu_read_unlock(); 1635 1636 xa_destroy(xa); 1637 1638 check_move_tiny(xa); 1639 check_move_max(xa); 1640 1641 for (i = 0; i < 16; i++) 1642 check_move_small(xa, 1UL << i); 1643 1644 for (i = 2; i < 16; i++) 1645 check_move_small(xa, (1UL << i) - 1); 1646 } 1647 1648 static noinline void xa_store_many_order(struct xarray *xa, 1649 unsigned long index, unsigned order) 1650 { 1651 XA_STATE_ORDER(xas, xa, index, order); 1652 unsigned int i = 0; 1653 1654 do { 1655 xas_lock(&xas); 1656 XA_BUG_ON(xa, xas_find_conflict(&xas)); 1657 xas_create_range(&xas); 1658 if (xas_error(&xas)) 1659 goto unlock; 1660 for (i = 0; i < (1U << order); i++) { 1661 XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(index + i))); 1662 xas_next(&xas); 1663 } 1664 unlock: 1665 xas_unlock(&xas); 1666 } while (xas_nomem(&xas, GFP_KERNEL)); 1667 1668 XA_BUG_ON(xa, xas_error(&xas)); 1669 } 1670 1671 static noinline void check_create_range_1(struct xarray *xa, 1672 unsigned long index, unsigned order) 1673 { 1674 unsigned long i; 1675 1676 xa_store_many_order(xa, index, order); 1677 for (i = index; i < index + (1UL << order); i++) 1678 xa_erase_index(xa, i); 1679 XA_BUG_ON(xa, !xa_empty(xa)); 1680 } 1681 1682 static noinline void check_create_range_2(struct xarray *xa, unsigned order) 1683 { 1684 unsigned long i; 1685 unsigned long nr = 1UL << order; 1686 1687 for (i = 0; i < nr * nr; i += nr) 1688 xa_store_many_order(xa, i, order); 1689 for (i = 0; i < nr * nr; i++) 1690 xa_erase_index(xa, i); 1691 XA_BUG_ON(xa, !xa_empty(xa)); 1692 } 1693 1694 static noinline void check_create_range_3(void) 1695 { 1696 XA_STATE(xas, NULL, 0); 1697 xas_set_err(&xas, -EEXIST); 1698 xas_create_range(&xas); 1699 XA_BUG_ON(NULL, xas_error(&xas) != -EEXIST); 1700 } 1701 1702 static noinline void check_create_range_4(struct xarray *xa, 1703 unsigned long index, unsigned order) 1704 { 1705 XA_STATE_ORDER(xas, xa, index, order); 1706 unsigned long base = xas.xa_index; 1707 unsigned long i = 0; 1708 1709 xa_store_index(xa, index, GFP_KERNEL); 1710 do { 1711 xas_lock(&xas); 1712 xas_create_range(&xas); 1713 if (xas_error(&xas)) 1714 goto unlock; 1715 for (i = 0; i < (1UL << order); i++) { 1716 void *old = xas_store(&xas, xa_mk_index(base + i)); 1717 if (xas.xa_index == index) 1718 XA_BUG_ON(xa, old != xa_mk_index(base + i)); 1719 else 1720 XA_BUG_ON(xa, old != NULL); 1721 xas_next(&xas); 1722 } 1723 unlock: 1724 xas_unlock(&xas); 1725 } while (xas_nomem(&xas, GFP_KERNEL)); 1726 1727 XA_BUG_ON(xa, xas_error(&xas)); 1728 1729 for (i = base; i < base + (1UL << order); i++) 1730 xa_erase_index(xa, i); 1731 XA_BUG_ON(xa, !xa_empty(xa)); 1732 } 1733 1734 static noinline void check_create_range_5(struct xarray *xa, 1735 unsigned long index, unsigned int order) 1736 { 1737 XA_STATE_ORDER(xas, xa, index, order); 1738 unsigned int i; 1739 1740 xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL); 1741 1742 for (i = 0; i < order + 10; i++) { 1743 do { 1744 xas_lock(&xas); 1745 xas_create_range(&xas); 1746 xas_unlock(&xas); 1747 } while (xas_nomem(&xas, GFP_KERNEL)); 1748 } 1749 1750 xa_destroy(xa); 1751 } 1752 1753 static noinline void check_create_range(struct xarray *xa) 1754 { 1755 unsigned int order; 1756 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 12 : 1; 1757 1758 for (order = 0; order < max_order; order++) { 1759 check_create_range_1(xa, 0, order); 1760 check_create_range_1(xa, 1U << order, order); 1761 check_create_range_1(xa, 2U << order, order); 1762 check_create_range_1(xa, 3U << order, order); 1763 check_create_range_1(xa, 1U << 24, order); 1764 if (order < 10) 1765 check_create_range_2(xa, order); 1766 1767 check_create_range_4(xa, 0, order); 1768 check_create_range_4(xa, 1U << order, order); 1769 check_create_range_4(xa, 2U << order, order); 1770 check_create_range_4(xa, 3U << order, order); 1771 check_create_range_4(xa, 1U << 24, order); 1772 1773 check_create_range_4(xa, 1, order); 1774 check_create_range_4(xa, (1U << order) + 1, order); 1775 check_create_range_4(xa, (2U << order) + 1, order); 1776 check_create_range_4(xa, (2U << order) - 1, order); 1777 check_create_range_4(xa, (3U << order) + 1, order); 1778 check_create_range_4(xa, (3U << order) - 1, order); 1779 check_create_range_4(xa, (1U << 24) + 1, order); 1780 1781 check_create_range_5(xa, 0, order); 1782 check_create_range_5(xa, (1U << order), order); 1783 } 1784 1785 check_create_range_3(); 1786 } 1787 1788 static noinline void __check_store_range(struct xarray *xa, unsigned long first, 1789 unsigned long last) 1790 { 1791 #ifdef CONFIG_XARRAY_MULTI 1792 xa_store_range(xa, first, last, xa_mk_index(first), GFP_KERNEL); 1793 1794 XA_BUG_ON(xa, xa_load(xa, first) != xa_mk_index(first)); 1795 XA_BUG_ON(xa, xa_load(xa, last) != xa_mk_index(first)); 1796 XA_BUG_ON(xa, xa_load(xa, first - 1) != NULL); 1797 XA_BUG_ON(xa, xa_load(xa, last + 1) != NULL); 1798 1799 xa_store_range(xa, first, last, NULL, GFP_KERNEL); 1800 #endif 1801 1802 XA_BUG_ON(xa, !xa_empty(xa)); 1803 } 1804 1805 static noinline void check_store_range(struct xarray *xa) 1806 { 1807 unsigned long i, j; 1808 1809 for (i = 0; i < 128; i++) { 1810 for (j = i; j < 128; j++) { 1811 __check_store_range(xa, i, j); 1812 __check_store_range(xa, 128 + i, 128 + j); 1813 __check_store_range(xa, 4095 + i, 4095 + j); 1814 __check_store_range(xa, 4096 + i, 4096 + j); 1815 __check_store_range(xa, 123456 + i, 123456 + j); 1816 __check_store_range(xa, (1 << 24) + i, (1 << 24) + j); 1817 } 1818 } 1819 } 1820 1821 #ifdef CONFIG_XARRAY_MULTI 1822 static void check_split_1(struct xarray *xa, unsigned long index, 1823 unsigned int order, unsigned int new_order) 1824 { 1825 XA_STATE_ORDER(xas, xa, index, new_order); 1826 unsigned int i, found; 1827 void *entry; 1828 1829 xa_store_order(xa, index, order, xa, GFP_KERNEL); 1830 xa_set_mark(xa, index, XA_MARK_1); 1831 1832 xas_split_alloc(&xas, xa, order, GFP_KERNEL); 1833 xas_lock(&xas); 1834 xas_split(&xas, xa, order); 1835 for (i = 0; i < (1 << order); i += (1 << new_order)) 1836 __xa_store(xa, index + i, xa_mk_index(index + i), 0); 1837 xas_unlock(&xas); 1838 1839 for (i = 0; i < (1 << order); i++) { 1840 unsigned int val = index + (i & ~((1 << new_order) - 1)); 1841 XA_BUG_ON(xa, xa_load(xa, index + i) != xa_mk_index(val)); 1842 } 1843 1844 xa_set_mark(xa, index, XA_MARK_0); 1845 XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0)); 1846 1847 xas_set_order(&xas, index, 0); 1848 found = 0; 1849 rcu_read_lock(); 1850 xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_1) { 1851 found++; 1852 XA_BUG_ON(xa, xa_is_internal(entry)); 1853 } 1854 rcu_read_unlock(); 1855 XA_BUG_ON(xa, found != 1 << (order - new_order)); 1856 1857 xa_destroy(xa); 1858 } 1859 1860 static noinline void check_split(struct xarray *xa) 1861 { 1862 unsigned int order, new_order; 1863 1864 XA_BUG_ON(xa, !xa_empty(xa)); 1865 1866 for (order = 1; order < 2 * XA_CHUNK_SHIFT; order++) { 1867 for (new_order = 0; new_order < order; new_order++) { 1868 check_split_1(xa, 0, order, new_order); 1869 check_split_1(xa, 1UL << order, order, new_order); 1870 check_split_1(xa, 3UL << order, order, new_order); 1871 } 1872 } 1873 } 1874 #else 1875 static void check_split(struct xarray *xa) { } 1876 #endif 1877 1878 static void check_align_1(struct xarray *xa, char *name) 1879 { 1880 int i; 1881 unsigned int id; 1882 unsigned long index; 1883 void *entry; 1884 1885 for (i = 0; i < 8; i++) { 1886 XA_BUG_ON(xa, xa_alloc(xa, &id, name + i, xa_limit_32b, 1887 GFP_KERNEL) != 0); 1888 XA_BUG_ON(xa, id != i); 1889 } 1890 xa_for_each(xa, index, entry) 1891 XA_BUG_ON(xa, xa_is_err(entry)); 1892 xa_destroy(xa); 1893 } 1894 1895 /* 1896 * We should always be able to store without allocating memory after 1897 * reserving a slot. 1898 */ 1899 static void check_align_2(struct xarray *xa, char *name) 1900 { 1901 int i; 1902 1903 XA_BUG_ON(xa, !xa_empty(xa)); 1904 1905 for (i = 0; i < 8; i++) { 1906 XA_BUG_ON(xa, xa_store(xa, 0, name + i, GFP_KERNEL) != NULL); 1907 xa_erase(xa, 0); 1908 } 1909 1910 for (i = 0; i < 8; i++) { 1911 XA_BUG_ON(xa, xa_reserve(xa, 0, GFP_KERNEL) != 0); 1912 XA_BUG_ON(xa, xa_store(xa, 0, name + i, 0) != NULL); 1913 xa_erase(xa, 0); 1914 } 1915 1916 XA_BUG_ON(xa, !xa_empty(xa)); 1917 } 1918 1919 static noinline void check_align(struct xarray *xa) 1920 { 1921 char name[] = "Motorola 68000"; 1922 1923 check_align_1(xa, name); 1924 check_align_1(xa, name + 1); 1925 check_align_1(xa, name + 2); 1926 check_align_1(xa, name + 3); 1927 check_align_2(xa, name); 1928 } 1929 1930 static LIST_HEAD(shadow_nodes); 1931 1932 static void test_update_node(struct xa_node *node) 1933 { 1934 if (node->count && node->count == node->nr_values) { 1935 if (list_empty(&node->private_list)) 1936 list_add(&shadow_nodes, &node->private_list); 1937 } else { 1938 if (!list_empty(&node->private_list)) 1939 list_del_init(&node->private_list); 1940 } 1941 } 1942 1943 static noinline void shadow_remove(struct xarray *xa) 1944 { 1945 struct xa_node *node; 1946 1947 xa_lock(xa); 1948 while ((node = list_first_entry_or_null(&shadow_nodes, 1949 struct xa_node, private_list))) { 1950 XA_BUG_ON(xa, node->array != xa); 1951 list_del_init(&node->private_list); 1952 xa_delete_node(node, test_update_node); 1953 } 1954 xa_unlock(xa); 1955 } 1956 1957 static noinline void check_workingset(struct xarray *xa, unsigned long index) 1958 { 1959 XA_STATE(xas, xa, index); 1960 xas_set_update(&xas, test_update_node); 1961 1962 do { 1963 xas_lock(&xas); 1964 xas_store(&xas, xa_mk_value(0)); 1965 xas_next(&xas); 1966 xas_store(&xas, xa_mk_value(1)); 1967 xas_unlock(&xas); 1968 } while (xas_nomem(&xas, GFP_KERNEL)); 1969 1970 XA_BUG_ON(xa, list_empty(&shadow_nodes)); 1971 1972 xas_lock(&xas); 1973 xas_next(&xas); 1974 xas_store(&xas, &xas); 1975 XA_BUG_ON(xa, !list_empty(&shadow_nodes)); 1976 1977 xas_store(&xas, xa_mk_value(2)); 1978 xas_unlock(&xas); 1979 XA_BUG_ON(xa, list_empty(&shadow_nodes)); 1980 1981 shadow_remove(xa); 1982 XA_BUG_ON(xa, !list_empty(&shadow_nodes)); 1983 XA_BUG_ON(xa, !xa_empty(xa)); 1984 } 1985 1986 /* 1987 * Check that the pointer / value / sibling entries are accounted the 1988 * way we expect them to be. 1989 */ 1990 static noinline void check_account(struct xarray *xa) 1991 { 1992 #ifdef CONFIG_XARRAY_MULTI 1993 unsigned int order; 1994 1995 for (order = 1; order < 12; order++) { 1996 XA_STATE(xas, xa, 1 << order); 1997 1998 xa_store_order(xa, 0, order, xa, GFP_KERNEL); 1999 rcu_read_lock(); 2000 xas_load(&xas); 2001 XA_BUG_ON(xa, xas.xa_node->count == 0); 2002 XA_BUG_ON(xa, xas.xa_node->count > (1 << order)); 2003 XA_BUG_ON(xa, xas.xa_node->nr_values != 0); 2004 rcu_read_unlock(); 2005 2006 xa_store_order(xa, 1 << order, order, xa_mk_index(1UL << order), 2007 GFP_KERNEL); 2008 XA_BUG_ON(xa, xas.xa_node->count != xas.xa_node->nr_values * 2); 2009 2010 xa_erase(xa, 1 << order); 2011 XA_BUG_ON(xa, xas.xa_node->nr_values != 0); 2012 2013 xa_erase(xa, 0); 2014 XA_BUG_ON(xa, !xa_empty(xa)); 2015 } 2016 #endif 2017 } 2018 2019 static noinline void check_get_order(struct xarray *xa) 2020 { 2021 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1; 2022 unsigned int order; 2023 unsigned long i, j; 2024 2025 for (i = 0; i < 3; i++) 2026 XA_BUG_ON(xa, xa_get_order(xa, i) != 0); 2027 2028 for (order = 0; order < max_order; order++) { 2029 for (i = 0; i < 10; i++) { 2030 xa_store_order(xa, i << order, order, 2031 xa_mk_index(i << order), GFP_KERNEL); 2032 for (j = i << order; j < (i + 1) << order; j++) 2033 XA_BUG_ON(xa, xa_get_order(xa, j) != order); 2034 xa_erase(xa, i << order); 2035 } 2036 } 2037 } 2038 2039 static noinline void check_xas_get_order(struct xarray *xa) 2040 { 2041 XA_STATE(xas, xa, 0); 2042 2043 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1; 2044 unsigned int order; 2045 unsigned long i, j; 2046 2047 for (order = 0; order < max_order; order++) { 2048 for (i = 0; i < 10; i++) { 2049 xas_set_order(&xas, i << order, order); 2050 do { 2051 xas_lock(&xas); 2052 xas_store(&xas, xa_mk_value(i)); 2053 xas_unlock(&xas); 2054 } while (xas_nomem(&xas, GFP_KERNEL)); 2055 2056 for (j = i << order; j < (i + 1) << order; j++) { 2057 xas_set_order(&xas, j, 0); 2058 rcu_read_lock(); 2059 xas_load(&xas); 2060 XA_BUG_ON(xa, xas_get_order(&xas) != order); 2061 rcu_read_unlock(); 2062 } 2063 2064 xas_lock(&xas); 2065 xas_set_order(&xas, i << order, order); 2066 xas_store(&xas, NULL); 2067 xas_unlock(&xas); 2068 } 2069 } 2070 } 2071 2072 static noinline void check_xas_conflict_get_order(struct xarray *xa) 2073 { 2074 XA_STATE(xas, xa, 0); 2075 2076 void *entry; 2077 int only_once; 2078 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1; 2079 unsigned int order; 2080 unsigned long i, j, k; 2081 2082 for (order = 0; order < max_order; order++) { 2083 for (i = 0; i < 10; i++) { 2084 xas_set_order(&xas, i << order, order); 2085 do { 2086 xas_lock(&xas); 2087 xas_store(&xas, xa_mk_value(i)); 2088 xas_unlock(&xas); 2089 } while (xas_nomem(&xas, GFP_KERNEL)); 2090 2091 /* 2092 * Ensure xas_get_order works with xas_for_each_conflict. 2093 */ 2094 j = i << order; 2095 for (k = 0; k < order; k++) { 2096 only_once = 0; 2097 xas_set_order(&xas, j + (1 << k), k); 2098 xas_lock(&xas); 2099 xas_for_each_conflict(&xas, entry) { 2100 XA_BUG_ON(xa, entry != xa_mk_value(i)); 2101 XA_BUG_ON(xa, xas_get_order(&xas) != order); 2102 only_once++; 2103 } 2104 XA_BUG_ON(xa, only_once != 1); 2105 xas_unlock(&xas); 2106 } 2107 2108 if (order < max_order - 1) { 2109 only_once = 0; 2110 xas_set_order(&xas, (i & ~1UL) << order, order + 1); 2111 xas_lock(&xas); 2112 xas_for_each_conflict(&xas, entry) { 2113 XA_BUG_ON(xa, entry != xa_mk_value(i)); 2114 XA_BUG_ON(xa, xas_get_order(&xas) != order); 2115 only_once++; 2116 } 2117 XA_BUG_ON(xa, only_once != 1); 2118 xas_unlock(&xas); 2119 } 2120 2121 xas_set_order(&xas, i << order, order); 2122 xas_lock(&xas); 2123 xas_store(&xas, NULL); 2124 xas_unlock(&xas); 2125 } 2126 } 2127 } 2128 2129 2130 static noinline void check_destroy(struct xarray *xa) 2131 { 2132 unsigned long index; 2133 2134 XA_BUG_ON(xa, !xa_empty(xa)); 2135 2136 /* Destroying an empty array is a no-op */ 2137 xa_destroy(xa); 2138 XA_BUG_ON(xa, !xa_empty(xa)); 2139 2140 /* Destroying an array with a single entry */ 2141 for (index = 0; index < 1000; index++) { 2142 xa_store_index(xa, index, GFP_KERNEL); 2143 XA_BUG_ON(xa, xa_empty(xa)); 2144 xa_destroy(xa); 2145 XA_BUG_ON(xa, !xa_empty(xa)); 2146 } 2147 2148 /* Destroying an array with a single entry at ULONG_MAX */ 2149 xa_store(xa, ULONG_MAX, xa, GFP_KERNEL); 2150 XA_BUG_ON(xa, xa_empty(xa)); 2151 xa_destroy(xa); 2152 XA_BUG_ON(xa, !xa_empty(xa)); 2153 2154 #ifdef CONFIG_XARRAY_MULTI 2155 /* Destroying an array with a multi-index entry */ 2156 xa_store_order(xa, 1 << 11, 11, xa, GFP_KERNEL); 2157 XA_BUG_ON(xa, xa_empty(xa)); 2158 xa_destroy(xa); 2159 XA_BUG_ON(xa, !xa_empty(xa)); 2160 #endif 2161 } 2162 2163 static DEFINE_XARRAY(array); 2164 2165 static int xarray_checks(void) 2166 { 2167 check_xa_err(&array); 2168 check_xas_retry(&array); 2169 check_xa_load(&array); 2170 check_xa_mark(&array); 2171 check_xa_shrink(&array); 2172 check_xas_erase(&array); 2173 check_insert(&array); 2174 check_cmpxchg(&array); 2175 check_cmpxchg_order(&array); 2176 check_reserve(&array); 2177 check_reserve(&xa0); 2178 check_multi_store(&array); 2179 check_multi_store_advanced(&array); 2180 check_get_order(&array); 2181 check_xas_get_order(&array); 2182 check_xas_conflict_get_order(&array); 2183 check_xa_alloc(); 2184 check_find(&array); 2185 check_find_entry(&array); 2186 check_pause(&array); 2187 check_account(&array); 2188 check_destroy(&array); 2189 check_move(&array); 2190 check_create_range(&array); 2191 check_store_range(&array); 2192 check_store_iter(&array); 2193 check_align(&xa0); 2194 check_split(&array); 2195 2196 check_workingset(&array, 0); 2197 check_workingset(&array, 64); 2198 check_workingset(&array, 4096); 2199 2200 printk("XArray: %u of %u tests passed\n", tests_passed, tests_run); 2201 return (tests_run == tests_passed) ? 0 : -EINVAL; 2202 } 2203 2204 static void xarray_exit(void) 2205 { 2206 } 2207 2208 module_init(xarray_checks); 2209 module_exit(xarray_exit); 2210 MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>"); 2211 MODULE_DESCRIPTION("XArray API test module"); 2212 MODULE_LICENSE("GPL"); 2213