1 // SPDX-License-Identifier: GPL-2.0+
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>
9 #include <linux/xarray.h>
10 #include <linux/module.h>
12 static unsigned int tests_run;
13 static unsigned int tests_passed;
15 static const unsigned int order_limit =
16 IS_ENABLED(CONFIG_XARRAY_MULTI) ? BITS_PER_LONG : 1;
20 void xa_dump(const struct xarray *xa) { }
23 #define XA_BUG_ON(xa, x) do { \
26 printk("BUG at %s:%d\n", __func__, __LINE__); \
35 static void *xa_mk_index(unsigned long index)
37 return xa_mk_value(index & LONG_MAX);
40 static void *xa_store_index(struct xarray *xa, unsigned long index, gfp_t gfp)
42 return xa_store(xa, index, xa_mk_index(index), gfp);
45 static void xa_insert_index(struct xarray *xa, unsigned long index)
47 XA_BUG_ON(xa, xa_insert(xa, index, xa_mk_index(index),
51 static void xa_alloc_index(struct xarray *xa, unsigned long index, gfp_t gfp)
55 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(index), xa_limit_32b,
57 XA_BUG_ON(xa, id != index);
60 static void xa_erase_index(struct xarray *xa, unsigned long index)
62 XA_BUG_ON(xa, xa_erase(xa, index) != xa_mk_index(index));
63 XA_BUG_ON(xa, xa_load(xa, index) != NULL);
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.
71 static void *xa_store_order(struct xarray *xa, unsigned long index,
72 unsigned order, void *entry, gfp_t gfp)
74 XA_STATE_ORDER(xas, xa, index, order);
79 curr = xas_store(&xas, entry);
81 } while (xas_nomem(&xas, gfp));
86 static noinline void check_xa_err(struct xarray *xa)
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);
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);
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);
102 static noinline void check_xas_retry(struct xarray *xa)
104 XA_STATE(xas, xa, 0);
107 xa_store_index(xa, 0, GFP_KERNEL);
108 xa_store_index(xa, 1, GFP_KERNEL);
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)));
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);
122 XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
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));
130 /* Make sure we can iterate through retry entries */
133 xas_store(&xas, XA_RETRY_ENTRY);
135 xas_store(&xas, XA_RETRY_ENTRY);
138 xas_for_each(&xas, entry, ULONG_MAX) {
139 xas_store(&xas, xa_mk_index(xas.xa_index));
143 xa_erase_index(xa, 0);
144 xa_erase_index(xa, 1);
147 static noinline void check_xa_load(struct xarray *xa)
151 for (i = 0; i < 1024; i++) {
152 for (j = 0; j < 1024; j++) {
153 void *entry = xa_load(xa, j);
155 XA_BUG_ON(xa, xa_to_value(entry) != j);
157 XA_BUG_ON(xa, entry);
159 XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
162 for (i = 0; i < 1024; i++) {
163 for (j = 0; j < 1024; j++) {
164 void *entry = xa_load(xa, j);
166 XA_BUG_ON(xa, xa_to_value(entry) != j);
168 XA_BUG_ON(xa, entry);
170 xa_erase_index(xa, i);
172 XA_BUG_ON(xa, !xa_empty(xa));
175 static noinline void check_xa_mark_1(struct xarray *xa, unsigned long index)
178 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 8 : 1;
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));
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));
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));
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));
203 * Storing a multi-index entry over entries with marks gives the
204 * entire entry the union of the marks
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);
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),
219 for (i = base; i < next; i++) {
220 XA_STATE(xas, xa, i);
221 unsigned int seen = 0;
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));
228 /* We should see two elements in the array */
230 xas_for_each(&xas, entry, ULONG_MAX)
233 XA_BUG_ON(xa, seen != 2);
235 /* One of which is marked */
239 xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
242 XA_BUG_ON(xa, seen != 1);
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));
251 XA_BUG_ON(xa, !xa_empty(xa));
254 static noinline void check_xa_mark_2(struct xarray *xa)
256 XA_STATE(xas, xa, 0);
258 unsigned int count = 0;
261 xa_store_index(xa, 0, GFP_KERNEL);
262 xa_set_mark(xa, 0, XA_MARK_0);
265 xas_init_marks(&xas);
267 XA_BUG_ON(xa, !xa_get_mark(xa, 0, XA_MARK_0) == 0);
269 for (index = 3500; index < 4500; index++) {
270 xa_store_index(xa, index, GFP_KERNEL);
271 xa_set_mark(xa, index, XA_MARK_0);
276 xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
279 XA_BUG_ON(xa, count != 1000);
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));
292 static noinline void check_xa_mark_3(struct xarray *xa)
294 #ifdef CONFIG_XARRAY_MULTI
295 XA_STATE(xas, xa, 0x41);
299 xa_store_order(xa, 0x40, 2, xa_mk_index(0x40), GFP_KERNEL);
300 xa_set_mark(xa, 0x41, XA_MARK_0);
303 xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0) {
305 XA_BUG_ON(xa, entry != xa_mk_index(0x40));
307 XA_BUG_ON(xa, count != 1);
313 static noinline void check_xa_mark(struct xarray *xa)
317 for (index = 0; index < 16384; index += 4)
318 check_xa_mark_1(xa, index);
324 static noinline void check_xa_shrink(struct xarray *xa)
326 XA_STATE(xas, xa, 1);
327 struct xa_node *node;
329 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 15 : 1;
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);
336 * Check that erasing the entry at 1 shrinks the tree and properly
337 * marks the node as being deleted.
340 XA_BUG_ON(xa, xas_load(&xas) != xa_mk_value(1));
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);
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));
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);
361 XA_BUG_ON(xa, xa_store_index(xa, ULONG_MAX, GFP_KERNEL) !=
364 XA_BUG_ON(xa, xa_head(xa) == node);
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);
373 static noinline void check_insert(struct xarray *xa)
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);
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);
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);
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);
401 XA_BUG_ON(xa, !xa_empty(xa));
404 static noinline void check_cmpxchg(struct xarray *xa)
406 void *FIVE = xa_mk_value(5);
407 void *SIX = xa_mk_value(6);
408 void *LOTS = xa_mk_value(12345678);
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));
426 static noinline void check_reserve(struct xarray *xa)
432 /* An array with a reserved entry is not empty */
433 XA_BUG_ON(xa, !xa_empty(xa));
434 XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
435 XA_BUG_ON(xa, xa_empty(xa));
436 XA_BUG_ON(xa, xa_load(xa, 12345678));
437 xa_release(xa, 12345678);
438 XA_BUG_ON(xa, !xa_empty(xa));
440 /* Releasing a used entry does nothing */
441 XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
442 XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_NOWAIT) != NULL);
443 xa_release(xa, 12345678);
444 xa_erase_index(xa, 12345678);
445 XA_BUG_ON(xa, !xa_empty(xa));
447 /* cmpxchg sees a reserved entry as ZERO */
448 XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
449 XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, XA_ZERO_ENTRY,
450 xa_mk_value(12345678), GFP_NOWAIT) != NULL);
451 xa_release(xa, 12345678);
452 xa_erase_index(xa, 12345678);
453 XA_BUG_ON(xa, !xa_empty(xa));
455 /* xa_insert treats it as busy */
456 XA_BUG_ON(xa, xa_reserve(xa, 12345678, GFP_KERNEL) != 0);
457 XA_BUG_ON(xa, xa_insert(xa, 12345678, xa_mk_value(12345678), 0) !=
459 XA_BUG_ON(xa, xa_empty(xa));
460 XA_BUG_ON(xa, xa_erase(xa, 12345678) != NULL);
461 XA_BUG_ON(xa, !xa_empty(xa));
463 /* Can iterate through a reserved entry */
464 xa_store_index(xa, 5, GFP_KERNEL);
465 XA_BUG_ON(xa, xa_reserve(xa, 6, GFP_KERNEL) != 0);
466 xa_store_index(xa, 7, GFP_KERNEL);
469 xa_for_each(xa, index, entry) {
470 XA_BUG_ON(xa, index != 5 && index != 7);
473 XA_BUG_ON(xa, count != 2);
475 /* If we free a reserved entry, we should be able to allocate it */
476 if (xa->xa_flags & XA_FLAGS_ALLOC) {
479 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(8),
480 XA_LIMIT(5, 10), GFP_KERNEL) != 0);
481 XA_BUG_ON(xa, id != 8);
484 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_value(6),
485 XA_LIMIT(5, 10), GFP_KERNEL) != 0);
486 XA_BUG_ON(xa, id != 6);
492 static noinline void check_xas_erase(struct xarray *xa)
494 XA_STATE(xas, xa, 0);
498 for (i = 0; i < 200; i++) {
499 for (j = i; j < 2 * i + 17; j++) {
503 xas_store(&xas, xa_mk_index(j));
505 } while (xas_nomem(&xas, GFP_KERNEL));
508 xas_set(&xas, ULONG_MAX);
511 xas_store(&xas, xa_mk_value(0));
513 } while (xas_nomem(&xas, GFP_KERNEL));
516 xas_store(&xas, NULL);
520 xas_for_each(&xas, entry, ULONG_MAX) {
521 XA_BUG_ON(xa, entry != xa_mk_index(j));
522 xas_store(&xas, NULL);
526 XA_BUG_ON(xa, !xa_empty(xa));
530 #ifdef CONFIG_XARRAY_MULTI
531 static noinline void check_multi_store_1(struct xarray *xa, unsigned long index,
534 XA_STATE(xas, xa, index);
535 unsigned long min = index & ~((1UL << order) - 1);
536 unsigned long max = min + (1UL << order);
538 xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
539 XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(index));
540 XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(index));
541 XA_BUG_ON(xa, xa_load(xa, max) != NULL);
542 XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
545 XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(min)) != xa_mk_index(index));
547 XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(min));
548 XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(min));
549 XA_BUG_ON(xa, xa_load(xa, max) != NULL);
550 XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
552 xa_erase_index(xa, min);
553 XA_BUG_ON(xa, !xa_empty(xa));
556 static noinline void check_multi_store_2(struct xarray *xa, unsigned long index,
559 XA_STATE(xas, xa, index);
560 xa_store_order(xa, index, order, xa_mk_value(0), GFP_KERNEL);
563 XA_BUG_ON(xa, xas_store(&xas, xa_mk_value(1)) != xa_mk_value(0));
564 XA_BUG_ON(xa, xas.xa_index != index);
565 XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
567 XA_BUG_ON(xa, !xa_empty(xa));
570 static noinline void check_multi_store_3(struct xarray *xa, unsigned long index,
573 XA_STATE(xas, xa, 0);
577 xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
580 xas_for_each(&xas, entry, ULONG_MAX) {
581 XA_BUG_ON(xa, entry != xa_mk_index(index));
584 XA_BUG_ON(xa, n != 1);
585 xas_set(&xas, index + 1);
586 xas_for_each(&xas, entry, ULONG_MAX) {
587 XA_BUG_ON(xa, entry != xa_mk_index(index));
590 XA_BUG_ON(xa, n != 2);
597 static noinline void check_multi_store(struct xarray *xa)
599 #ifdef CONFIG_XARRAY_MULTI
600 unsigned long i, j, k;
601 unsigned int max_order = (sizeof(long) == 4) ? 30 : 60;
603 /* Loading from any position returns the same value */
604 xa_store_order(xa, 0, 1, xa_mk_value(0), GFP_KERNEL);
605 XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
606 XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
607 XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
609 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 2);
610 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
613 /* Storing adjacent to the value does not alter the value */
614 xa_store(xa, 3, xa, GFP_KERNEL);
615 XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
616 XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
617 XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
619 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 3);
620 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
623 /* Overwriting multiple indexes works */
624 xa_store_order(xa, 0, 2, xa_mk_value(1), GFP_KERNEL);
625 XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(1));
626 XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(1));
627 XA_BUG_ON(xa, xa_load(xa, 2) != xa_mk_value(1));
628 XA_BUG_ON(xa, xa_load(xa, 3) != xa_mk_value(1));
629 XA_BUG_ON(xa, xa_load(xa, 4) != NULL);
631 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 4);
632 XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 4);
635 /* We can erase multiple values with a single store */
636 xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
637 XA_BUG_ON(xa, !xa_empty(xa));
639 /* Even when the first slot is empty but the others aren't */
640 xa_store_index(xa, 1, GFP_KERNEL);
641 xa_store_index(xa, 2, GFP_KERNEL);
642 xa_store_order(xa, 0, 2, NULL, GFP_KERNEL);
643 XA_BUG_ON(xa, !xa_empty(xa));
645 for (i = 0; i < max_order; i++) {
646 for (j = 0; j < max_order; j++) {
647 xa_store_order(xa, 0, i, xa_mk_index(i), GFP_KERNEL);
648 xa_store_order(xa, 0, j, xa_mk_index(j), GFP_KERNEL);
650 for (k = 0; k < max_order; k++) {
651 void *entry = xa_load(xa, (1UL << k) - 1);
652 if ((i < k) && (j < k))
653 XA_BUG_ON(xa, entry != NULL);
655 XA_BUG_ON(xa, entry != xa_mk_index(j));
659 XA_BUG_ON(xa, !xa_empty(xa));
663 for (i = 0; i < 20; i++) {
664 check_multi_store_1(xa, 200, i);
665 check_multi_store_1(xa, 0, i);
666 check_multi_store_1(xa, (1UL << i) + 1, i);
668 check_multi_store_2(xa, 4095, 9);
670 for (i = 1; i < 20; i++) {
671 check_multi_store_3(xa, 0, i);
672 check_multi_store_3(xa, 1UL << i, i);
677 static noinline void check_xa_alloc_1(struct xarray *xa, unsigned int base)
682 XA_BUG_ON(xa, !xa_empty(xa));
683 /* An empty array should assign %base to the first alloc */
684 xa_alloc_index(xa, base, GFP_KERNEL);
686 /* Erasing it should make the array empty again */
687 xa_erase_index(xa, base);
688 XA_BUG_ON(xa, !xa_empty(xa));
690 /* And it should assign %base again */
691 xa_alloc_index(xa, base, GFP_KERNEL);
693 /* Allocating and then erasing a lot should not lose base */
694 for (i = base + 1; i < 2 * XA_CHUNK_SIZE; i++)
695 xa_alloc_index(xa, i, GFP_KERNEL);
696 for (i = base; i < 2 * XA_CHUNK_SIZE; i++)
697 xa_erase_index(xa, i);
698 xa_alloc_index(xa, base, GFP_KERNEL);
700 /* Destroying the array should do the same as erasing */
703 /* And it should assign %base again */
704 xa_alloc_index(xa, base, GFP_KERNEL);
706 /* The next assigned ID should be base+1 */
707 xa_alloc_index(xa, base + 1, GFP_KERNEL);
708 xa_erase_index(xa, base + 1);
710 /* Storing a value should mark it used */
711 xa_store_index(xa, base + 1, GFP_KERNEL);
712 xa_alloc_index(xa, base + 2, GFP_KERNEL);
714 /* If we then erase base, it should be free */
715 xa_erase_index(xa, base);
716 xa_alloc_index(xa, base, GFP_KERNEL);
718 xa_erase_index(xa, base + 1);
719 xa_erase_index(xa, base + 2);
721 for (i = 1; i < 5000; i++) {
722 xa_alloc_index(xa, base + i, GFP_KERNEL);
727 /* Check that we fail properly at the limit of allocation */
728 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(UINT_MAX - 1),
729 XA_LIMIT(UINT_MAX - 1, UINT_MAX),
731 XA_BUG_ON(xa, id != 0xfffffffeU);
732 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(UINT_MAX),
733 XA_LIMIT(UINT_MAX - 1, UINT_MAX),
735 XA_BUG_ON(xa, id != 0xffffffffU);
737 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(0),
738 XA_LIMIT(UINT_MAX - 1, UINT_MAX),
739 GFP_KERNEL) != -EBUSY);
740 XA_BUG_ON(xa, id != 3);
743 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(10), XA_LIMIT(10, 5),
744 GFP_KERNEL) != -EBUSY);
745 XA_BUG_ON(xa, xa_store_index(xa, 3, GFP_KERNEL) != 0);
746 XA_BUG_ON(xa, xa_alloc(xa, &id, xa_mk_index(10), XA_LIMIT(10, 5),
747 GFP_KERNEL) != -EBUSY);
748 xa_erase_index(xa, 3);
749 XA_BUG_ON(xa, !xa_empty(xa));
752 static noinline void check_xa_alloc_2(struct xarray *xa, unsigned int base)
758 /* Allocate and free a NULL and check xa_empty() behaves */
759 XA_BUG_ON(xa, !xa_empty(xa));
760 XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
761 XA_BUG_ON(xa, id != base);
762 XA_BUG_ON(xa, xa_empty(xa));
763 XA_BUG_ON(xa, xa_erase(xa, id) != NULL);
764 XA_BUG_ON(xa, !xa_empty(xa));
766 /* Ditto, but check destroy instead of erase */
767 XA_BUG_ON(xa, !xa_empty(xa));
768 XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
769 XA_BUG_ON(xa, id != base);
770 XA_BUG_ON(xa, xa_empty(xa));
772 XA_BUG_ON(xa, !xa_empty(xa));
774 for (i = base; i < base + 10; i++) {
775 XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b,
777 XA_BUG_ON(xa, id != i);
780 XA_BUG_ON(xa, xa_store(xa, 3, xa_mk_index(3), GFP_KERNEL) != NULL);
781 XA_BUG_ON(xa, xa_store(xa, 4, xa_mk_index(4), GFP_KERNEL) != NULL);
782 XA_BUG_ON(xa, xa_store(xa, 4, NULL, GFP_KERNEL) != xa_mk_index(4));
783 XA_BUG_ON(xa, xa_erase(xa, 5) != NULL);
784 XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b, GFP_KERNEL) != 0);
785 XA_BUG_ON(xa, id != 5);
787 xa_for_each(xa, index, entry) {
788 xa_erase_index(xa, index);
791 for (i = base; i < base + 9; i++) {
792 XA_BUG_ON(xa, xa_erase(xa, i) != NULL);
793 XA_BUG_ON(xa, xa_empty(xa));
795 XA_BUG_ON(xa, xa_erase(xa, 8) != NULL);
796 XA_BUG_ON(xa, xa_empty(xa));
797 XA_BUG_ON(xa, xa_erase(xa, base + 9) != NULL);
798 XA_BUG_ON(xa, !xa_empty(xa));
803 static noinline void check_xa_alloc_3(struct xarray *xa, unsigned int base)
805 struct xa_limit limit = XA_LIMIT(1, 0x3fff);
811 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(1), limit,
812 &next, GFP_KERNEL) != 0);
813 XA_BUG_ON(xa, id != 1);
816 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(0x3ffd), limit,
817 &next, GFP_KERNEL) != 0);
818 XA_BUG_ON(xa, id != 0x3ffd);
819 xa_erase_index(xa, 0x3ffd);
820 xa_erase_index(xa, 1);
821 XA_BUG_ON(xa, !xa_empty(xa));
823 for (i = 0x3ffe; i < 0x4003; i++) {
825 entry = xa_mk_index(i);
827 entry = xa_mk_index(i - 0x3fff);
828 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, entry, limit,
829 &next, GFP_KERNEL) != (id == 1));
830 XA_BUG_ON(xa, xa_mk_index(id) != entry);
833 /* Check wrap-around is handled correctly */
835 xa_erase_index(xa, base);
836 xa_erase_index(xa, base + 1);
838 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(UINT_MAX),
839 xa_limit_32b, &next, GFP_KERNEL) != 0);
840 XA_BUG_ON(xa, id != UINT_MAX);
841 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(base),
842 xa_limit_32b, &next, GFP_KERNEL) != 1);
843 XA_BUG_ON(xa, id != base);
844 XA_BUG_ON(xa, xa_alloc_cyclic(xa, &id, xa_mk_index(base + 1),
845 xa_limit_32b, &next, GFP_KERNEL) != 0);
846 XA_BUG_ON(xa, id != base + 1);
848 xa_for_each(xa, index, entry)
849 xa_erase_index(xa, index);
851 XA_BUG_ON(xa, !xa_empty(xa));
854 static DEFINE_XARRAY_ALLOC(xa0);
855 static DEFINE_XARRAY_ALLOC1(xa1);
857 static noinline void check_xa_alloc(void)
859 check_xa_alloc_1(&xa0, 0);
860 check_xa_alloc_1(&xa1, 1);
861 check_xa_alloc_2(&xa0, 0);
862 check_xa_alloc_2(&xa1, 1);
863 check_xa_alloc_3(&xa0, 0);
864 check_xa_alloc_3(&xa1, 1);
867 static noinline void __check_store_iter(struct xarray *xa, unsigned long start,
868 unsigned int order, unsigned int present)
870 XA_STATE_ORDER(xas, xa, start, order);
872 unsigned int count = 0;
876 xas_for_each_conflict(&xas, entry) {
877 XA_BUG_ON(xa, !xa_is_value(entry));
878 XA_BUG_ON(xa, entry < xa_mk_index(start));
879 XA_BUG_ON(xa, entry > xa_mk_index(start + (1UL << order) - 1));
882 xas_store(&xas, xa_mk_index(start));
884 if (xas_nomem(&xas, GFP_KERNEL)) {
888 XA_BUG_ON(xa, xas_error(&xas));
889 XA_BUG_ON(xa, count != present);
890 XA_BUG_ON(xa, xa_load(xa, start) != xa_mk_index(start));
891 XA_BUG_ON(xa, xa_load(xa, start + (1UL << order) - 1) !=
893 xa_erase_index(xa, start);
896 static noinline void check_store_iter(struct xarray *xa)
899 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
901 for (i = 0; i < max_order; i++) {
902 unsigned int min = 1 << i;
903 unsigned int max = (2 << i) - 1;
904 __check_store_iter(xa, 0, i, 0);
905 XA_BUG_ON(xa, !xa_empty(xa));
906 __check_store_iter(xa, min, i, 0);
907 XA_BUG_ON(xa, !xa_empty(xa));
909 xa_store_index(xa, min, GFP_KERNEL);
910 __check_store_iter(xa, min, i, 1);
911 XA_BUG_ON(xa, !xa_empty(xa));
912 xa_store_index(xa, max, GFP_KERNEL);
913 __check_store_iter(xa, min, i, 1);
914 XA_BUG_ON(xa, !xa_empty(xa));
916 for (j = 0; j < min; j++)
917 xa_store_index(xa, j, GFP_KERNEL);
918 __check_store_iter(xa, 0, i, min);
919 XA_BUG_ON(xa, !xa_empty(xa));
920 for (j = 0; j < min; j++)
921 xa_store_index(xa, min + j, GFP_KERNEL);
922 __check_store_iter(xa, min, i, min);
923 XA_BUG_ON(xa, !xa_empty(xa));
925 #ifdef CONFIG_XARRAY_MULTI
926 xa_store_index(xa, 63, GFP_KERNEL);
927 xa_store_index(xa, 65, GFP_KERNEL);
928 __check_store_iter(xa, 64, 2, 1);
929 xa_erase_index(xa, 63);
931 XA_BUG_ON(xa, !xa_empty(xa));
934 static noinline void check_multi_find_1(struct xarray *xa, unsigned order)
936 #ifdef CONFIG_XARRAY_MULTI
937 unsigned long multi = 3 << order;
938 unsigned long next = 4 << order;
941 xa_store_order(xa, multi, order, xa_mk_value(multi), GFP_KERNEL);
942 XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL) != NULL);
943 XA_BUG_ON(xa, xa_store_index(xa, next + 1, GFP_KERNEL) != NULL);
946 XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
948 XA_BUG_ON(xa, index != multi);
950 XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
952 XA_BUG_ON(xa, (index < multi) || (index >= next));
953 XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) !=
955 XA_BUG_ON(xa, index != next);
956 XA_BUG_ON(xa, xa_find_after(xa, &index, next, XA_PRESENT) != NULL);
957 XA_BUG_ON(xa, index != next);
959 xa_erase_index(xa, multi);
960 xa_erase_index(xa, next);
961 xa_erase_index(xa, next + 1);
962 XA_BUG_ON(xa, !xa_empty(xa));
966 static noinline void check_multi_find_2(struct xarray *xa)
968 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 10 : 1;
972 for (i = 0; i < max_order; i++) {
973 unsigned long index = 1UL << i;
974 for (j = 0; j < index; j++) {
975 XA_STATE(xas, xa, j + index);
976 xa_store_index(xa, index - 1, GFP_KERNEL);
977 xa_store_order(xa, index, i, xa_mk_index(index),
980 xas_for_each(&xas, entry, ULONG_MAX) {
981 xa_erase_index(xa, index);
984 xa_erase_index(xa, index - 1);
985 XA_BUG_ON(xa, !xa_empty(xa));
990 static noinline void check_multi_find_3(struct xarray *xa)
994 for (order = 5; order < order_limit; order++) {
995 unsigned long index = 1UL << (order - 5);
997 XA_BUG_ON(xa, !xa_empty(xa));
998 xa_store_order(xa, 0, order - 4, xa_mk_index(0), GFP_KERNEL);
999 XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT));
1000 xa_erase_index(xa, 0);
1004 static noinline void check_find_1(struct xarray *xa)
1006 unsigned long i, j, k;
1008 XA_BUG_ON(xa, !xa_empty(xa));
1011 * Check xa_find with all pairs between 0 and 99 inclusive,
1012 * starting at every index between 0 and 99
1014 for (i = 0; i < 100; i++) {
1015 XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
1016 xa_set_mark(xa, i, XA_MARK_0);
1017 for (j = 0; j < i; j++) {
1018 XA_BUG_ON(xa, xa_store_index(xa, j, GFP_KERNEL) !=
1020 xa_set_mark(xa, j, XA_MARK_0);
1021 for (k = 0; k < 100; k++) {
1022 unsigned long index = k;
1023 void *entry = xa_find(xa, &index, ULONG_MAX,
1026 XA_BUG_ON(xa, index != j);
1028 XA_BUG_ON(xa, index != i);
1030 XA_BUG_ON(xa, entry != NULL);
1033 entry = xa_find(xa, &index, ULONG_MAX,
1036 XA_BUG_ON(xa, index != j);
1038 XA_BUG_ON(xa, index != i);
1040 XA_BUG_ON(xa, entry != NULL);
1042 xa_erase_index(xa, j);
1043 XA_BUG_ON(xa, xa_get_mark(xa, j, XA_MARK_0));
1044 XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
1046 xa_erase_index(xa, i);
1047 XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_0));
1049 XA_BUG_ON(xa, !xa_empty(xa));
1052 static noinline void check_find_2(struct xarray *xa)
1055 unsigned long i, j, index;
1057 xa_for_each(xa, index, entry) {
1058 XA_BUG_ON(xa, true);
1061 for (i = 0; i < 1024; i++) {
1062 xa_store_index(xa, index, GFP_KERNEL);
1064 xa_for_each(xa, index, entry) {
1065 XA_BUG_ON(xa, xa_mk_index(index) != entry);
1066 XA_BUG_ON(xa, index != j++);
1073 static noinline void check_find_3(struct xarray *xa)
1075 XA_STATE(xas, xa, 0);
1076 unsigned long i, j, k;
1079 for (i = 0; i < 100; i++) {
1080 for (j = 0; j < 100; j++) {
1082 for (k = 0; k < 100; k++) {
1084 xas_for_each_marked(&xas, entry, k, XA_MARK_0)
1088 xas.xa_node != XAS_RESTART);
1092 xa_store_index(xa, i, GFP_KERNEL);
1093 xa_set_mark(xa, i, XA_MARK_0);
1098 static noinline void check_find_4(struct xarray *xa)
1100 unsigned long index = 0;
1103 xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
1105 entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1106 XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
1108 entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1109 XA_BUG_ON(xa, entry);
1111 xa_erase_index(xa, ULONG_MAX);
1114 static noinline void check_find(struct xarray *xa)
1123 for (i = 2; i < 10; i++)
1124 check_multi_find_1(xa, i);
1125 check_multi_find_2(xa);
1126 check_multi_find_3(xa);
1129 /* See find_swap_entry() in mm/shmem.c */
1130 static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
1132 XA_STATE(xas, xa, 0);
1133 unsigned int checked = 0;
1137 xas_for_each(&xas, entry, ULONG_MAX) {
1138 if (xas_retry(&xas, entry))
1143 if ((checked % 4) != 0)
1149 return entry ? xas.xa_index : -1;
1152 static noinline void check_find_entry(struct xarray *xa)
1154 #ifdef CONFIG_XARRAY_MULTI
1156 unsigned long offset, index;
1158 for (order = 0; order < 20; order++) {
1159 for (offset = 0; offset < (1UL << (order + 3));
1160 offset += (1UL << order)) {
1161 for (index = 0; index < (1UL << (order + 5));
1162 index += (1UL << order)) {
1163 xa_store_order(xa, index, order,
1164 xa_mk_index(index), GFP_KERNEL);
1165 XA_BUG_ON(xa, xa_load(xa, index) !=
1166 xa_mk_index(index));
1167 XA_BUG_ON(xa, xa_find_entry(xa,
1168 xa_mk_index(index)) != index);
1170 XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
1176 XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
1177 xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
1178 XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
1179 XA_BUG_ON(xa, xa_find_entry(xa, xa_mk_index(ULONG_MAX)) != -1);
1180 xa_erase_index(xa, ULONG_MAX);
1181 XA_BUG_ON(xa, !xa_empty(xa));
1184 static noinline void check_pause(struct xarray *xa)
1186 XA_STATE(xas, xa, 0);
1189 unsigned long index = 1;
1190 unsigned int count = 0;
1192 for (order = 0; order < order_limit; order++) {
1193 XA_BUG_ON(xa, xa_store_order(xa, index, order,
1194 xa_mk_index(index), GFP_KERNEL));
1195 index += 1UL << order;
1199 xas_for_each(&xas, entry, ULONG_MAX) {
1200 XA_BUG_ON(xa, entry != xa_mk_index(1UL << count));
1204 XA_BUG_ON(xa, count != order_limit);
1209 xas_for_each(&xas, entry, ULONG_MAX) {
1210 XA_BUG_ON(xa, entry != xa_mk_index(1UL << count));
1215 XA_BUG_ON(xa, count != order_limit);
1220 static noinline void check_move_tiny(struct xarray *xa)
1222 XA_STATE(xas, xa, 0);
1224 XA_BUG_ON(xa, !xa_empty(xa));
1226 XA_BUG_ON(xa, xas_next(&xas) != NULL);
1227 XA_BUG_ON(xa, xas_next(&xas) != NULL);
1229 xa_store_index(xa, 0, GFP_KERNEL);
1232 XA_BUG_ON(xa, xas_next(&xas) != xa_mk_index(0));
1233 XA_BUG_ON(xa, xas_next(&xas) != NULL);
1235 XA_BUG_ON(xa, xas_prev(&xas) != xa_mk_index(0));
1236 XA_BUG_ON(xa, xas_prev(&xas) != NULL);
1238 xa_erase_index(xa, 0);
1239 XA_BUG_ON(xa, !xa_empty(xa));
1242 static noinline void check_move_max(struct xarray *xa)
1244 XA_STATE(xas, xa, 0);
1246 xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
1248 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_index(ULONG_MAX));
1249 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != NULL);
1254 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_index(ULONG_MAX));
1256 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != NULL);
1259 xa_erase_index(xa, ULONG_MAX);
1260 XA_BUG_ON(xa, !xa_empty(xa));
1263 static noinline void check_move_small(struct xarray *xa, unsigned long idx)
1265 XA_STATE(xas, xa, 0);
1268 xa_store_index(xa, 0, GFP_KERNEL);
1269 xa_store_index(xa, idx, GFP_KERNEL);
1272 for (i = 0; i < idx * 4; i++) {
1273 void *entry = xas_next(&xas);
1275 XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
1276 XA_BUG_ON(xa, xas.xa_index != i);
1277 if (i == 0 || i == idx)
1278 XA_BUG_ON(xa, entry != xa_mk_index(i));
1280 XA_BUG_ON(xa, entry != NULL);
1283 XA_BUG_ON(xa, xas.xa_index != i);
1286 void *entry = xas_prev(&xas);
1289 XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
1290 XA_BUG_ON(xa, xas.xa_index != i);
1291 if (i == 0 || i == idx)
1292 XA_BUG_ON(xa, entry != xa_mk_index(i));
1294 XA_BUG_ON(xa, entry != NULL);
1297 xas_set(&xas, ULONG_MAX);
1298 XA_BUG_ON(xa, xas_next(&xas) != NULL);
1299 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
1300 XA_BUG_ON(xa, xas_next(&xas) != xa_mk_value(0));
1301 XA_BUG_ON(xa, xas.xa_index != 0);
1302 XA_BUG_ON(xa, xas_prev(&xas) != NULL);
1303 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
1306 xa_erase_index(xa, 0);
1307 xa_erase_index(xa, idx);
1308 XA_BUG_ON(xa, !xa_empty(xa));
1311 static noinline void check_move(struct xarray *xa)
1313 XA_STATE(xas, xa, (1 << 16) - 1);
1316 for (i = 0; i < (1 << 16); i++)
1317 XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
1321 void *entry = xas_prev(&xas);
1323 XA_BUG_ON(xa, entry != xa_mk_index(i));
1324 XA_BUG_ON(xa, i != xas.xa_index);
1327 XA_BUG_ON(xa, xas_prev(&xas) != NULL);
1328 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
1331 void *entry = xas_next(&xas);
1332 XA_BUG_ON(xa, entry != xa_mk_index(i));
1333 XA_BUG_ON(xa, i != xas.xa_index);
1335 } while (i < (1 << 16));
1338 for (i = (1 << 8); i < (1 << 15); i++)
1339 xa_erase_index(xa, i);
1345 void *entry = xas_prev(&xas);
1347 if ((i < (1 << 8)) || (i >= (1 << 15)))
1348 XA_BUG_ON(xa, entry != xa_mk_index(i));
1350 XA_BUG_ON(xa, entry != NULL);
1351 XA_BUG_ON(xa, i != xas.xa_index);
1354 XA_BUG_ON(xa, xas_prev(&xas) != NULL);
1355 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
1358 void *entry = xas_next(&xas);
1359 if ((i < (1 << 8)) || (i >= (1 << 15)))
1360 XA_BUG_ON(xa, entry != xa_mk_index(i));
1362 XA_BUG_ON(xa, entry != NULL);
1363 XA_BUG_ON(xa, i != xas.xa_index);
1365 } while (i < (1 << 16));
1370 check_move_tiny(xa);
1373 for (i = 0; i < 16; i++)
1374 check_move_small(xa, 1UL << i);
1376 for (i = 2; i < 16; i++)
1377 check_move_small(xa, (1UL << i) - 1);
1380 static noinline void xa_store_many_order(struct xarray *xa,
1381 unsigned long index, unsigned order)
1383 XA_STATE_ORDER(xas, xa, index, order);
1388 XA_BUG_ON(xa, xas_find_conflict(&xas));
1389 xas_create_range(&xas);
1390 if (xas_error(&xas))
1392 for (i = 0; i < (1U << order); i++) {
1393 XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(index + i)));
1398 } while (xas_nomem(&xas, GFP_KERNEL));
1400 XA_BUG_ON(xa, xas_error(&xas));
1403 static noinline void check_create_range_1(struct xarray *xa,
1404 unsigned long index, unsigned order)
1408 xa_store_many_order(xa, index, order);
1409 for (i = index; i < index + (1UL << order); i++)
1410 xa_erase_index(xa, i);
1411 XA_BUG_ON(xa, !xa_empty(xa));
1414 static noinline void check_create_range_2(struct xarray *xa, unsigned order)
1417 unsigned long nr = 1UL << order;
1419 for (i = 0; i < nr * nr; i += nr)
1420 xa_store_many_order(xa, i, order);
1421 for (i = 0; i < nr * nr; i++)
1422 xa_erase_index(xa, i);
1423 XA_BUG_ON(xa, !xa_empty(xa));
1426 static noinline void check_create_range_3(void)
1428 XA_STATE(xas, NULL, 0);
1429 xas_set_err(&xas, -EEXIST);
1430 xas_create_range(&xas);
1431 XA_BUG_ON(NULL, xas_error(&xas) != -EEXIST);
1434 static noinline void check_create_range_4(struct xarray *xa,
1435 unsigned long index, unsigned order)
1437 XA_STATE_ORDER(xas, xa, index, order);
1438 unsigned long base = xas.xa_index;
1439 unsigned long i = 0;
1441 xa_store_index(xa, index, GFP_KERNEL);
1444 xas_create_range(&xas);
1445 if (xas_error(&xas))
1447 for (i = 0; i < (1UL << order); i++) {
1448 void *old = xas_store(&xas, xa_mk_index(base + i));
1449 if (xas.xa_index == index)
1450 XA_BUG_ON(xa, old != xa_mk_index(base + i));
1452 XA_BUG_ON(xa, old != NULL);
1457 } while (xas_nomem(&xas, GFP_KERNEL));
1459 XA_BUG_ON(xa, xas_error(&xas));
1461 for (i = base; i < base + (1UL << order); i++)
1462 xa_erase_index(xa, i);
1463 XA_BUG_ON(xa, !xa_empty(xa));
1466 static noinline void check_create_range(struct xarray *xa)
1469 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 12 : 1;
1471 for (order = 0; order < max_order; order++) {
1472 check_create_range_1(xa, 0, order);
1473 check_create_range_1(xa, 1U << order, order);
1474 check_create_range_1(xa, 2U << order, order);
1475 check_create_range_1(xa, 3U << order, order);
1476 check_create_range_1(xa, 1U << 24, order);
1478 check_create_range_2(xa, order);
1480 check_create_range_4(xa, 0, order);
1481 check_create_range_4(xa, 1U << order, order);
1482 check_create_range_4(xa, 2U << order, order);
1483 check_create_range_4(xa, 3U << order, order);
1484 check_create_range_4(xa, 1U << 24, order);
1486 check_create_range_4(xa, 1, order);
1487 check_create_range_4(xa, (1U << order) + 1, order);
1488 check_create_range_4(xa, (2U << order) + 1, order);
1489 check_create_range_4(xa, (2U << order) - 1, order);
1490 check_create_range_4(xa, (3U << order) + 1, order);
1491 check_create_range_4(xa, (3U << order) - 1, order);
1492 check_create_range_4(xa, (1U << 24) + 1, order);
1495 check_create_range_3();
1498 static noinline void __check_store_range(struct xarray *xa, unsigned long first,
1501 #ifdef CONFIG_XARRAY_MULTI
1502 xa_store_range(xa, first, last, xa_mk_index(first), GFP_KERNEL);
1504 XA_BUG_ON(xa, xa_load(xa, first) != xa_mk_index(first));
1505 XA_BUG_ON(xa, xa_load(xa, last) != xa_mk_index(first));
1506 XA_BUG_ON(xa, xa_load(xa, first - 1) != NULL);
1507 XA_BUG_ON(xa, xa_load(xa, last + 1) != NULL);
1509 xa_store_range(xa, first, last, NULL, GFP_KERNEL);
1512 XA_BUG_ON(xa, !xa_empty(xa));
1515 static noinline void check_store_range(struct xarray *xa)
1519 for (i = 0; i < 128; i++) {
1520 for (j = i; j < 128; j++) {
1521 __check_store_range(xa, i, j);
1522 __check_store_range(xa, 128 + i, 128 + j);
1523 __check_store_range(xa, 4095 + i, 4095 + j);
1524 __check_store_range(xa, 4096 + i, 4096 + j);
1525 __check_store_range(xa, 123456 + i, 123456 + j);
1526 __check_store_range(xa, (1 << 24) + i, (1 << 24) + j);
1531 #ifdef CONFIG_XARRAY_MULTI
1532 static void check_split_1(struct xarray *xa, unsigned long index,
1533 unsigned int order, unsigned int new_order)
1535 XA_STATE_ORDER(xas, xa, index, new_order);
1538 xa_store_order(xa, index, order, xa, GFP_KERNEL);
1540 xas_split_alloc(&xas, xa, order, GFP_KERNEL);
1542 xas_split(&xas, xa, order);
1543 for (i = 0; i < (1 << order); i += (1 << new_order))
1544 __xa_store(xa, index + i, xa_mk_index(index + i), 0);
1547 for (i = 0; i < (1 << order); i++) {
1548 unsigned int val = index + (i & ~((1 << new_order) - 1));
1549 XA_BUG_ON(xa, xa_load(xa, index + i) != xa_mk_index(val));
1552 xa_set_mark(xa, index, XA_MARK_0);
1553 XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
1558 static noinline void check_split(struct xarray *xa)
1560 unsigned int order, new_order;
1562 XA_BUG_ON(xa, !xa_empty(xa));
1564 for (order = 1; order < 2 * XA_CHUNK_SHIFT; order++) {
1565 for (new_order = 0; new_order < order; new_order++) {
1566 check_split_1(xa, 0, order, new_order);
1567 check_split_1(xa, 1UL << order, order, new_order);
1568 check_split_1(xa, 3UL << order, order, new_order);
1573 static void check_split(struct xarray *xa) { }
1576 static void check_align_1(struct xarray *xa, char *name)
1580 unsigned long index;
1583 for (i = 0; i < 8; i++) {
1584 XA_BUG_ON(xa, xa_alloc(xa, &id, name + i, xa_limit_32b,
1586 XA_BUG_ON(xa, id != i);
1588 xa_for_each(xa, index, entry)
1589 XA_BUG_ON(xa, xa_is_err(entry));
1594 * We should always be able to store without allocating memory after
1597 static void check_align_2(struct xarray *xa, char *name)
1601 XA_BUG_ON(xa, !xa_empty(xa));
1603 for (i = 0; i < 8; i++) {
1604 XA_BUG_ON(xa, xa_store(xa, 0, name + i, GFP_KERNEL) != NULL);
1608 for (i = 0; i < 8; i++) {
1609 XA_BUG_ON(xa, xa_reserve(xa, 0, GFP_KERNEL) != 0);
1610 XA_BUG_ON(xa, xa_store(xa, 0, name + i, 0) != NULL);
1614 XA_BUG_ON(xa, !xa_empty(xa));
1617 static noinline void check_align(struct xarray *xa)
1619 char name[] = "Motorola 68000";
1621 check_align_1(xa, name);
1622 check_align_1(xa, name + 1);
1623 check_align_1(xa, name + 2);
1624 check_align_1(xa, name + 3);
1625 check_align_2(xa, name);
1628 static LIST_HEAD(shadow_nodes);
1630 static void test_update_node(struct xa_node *node)
1632 if (node->count && node->count == node->nr_values) {
1633 if (list_empty(&node->private_list))
1634 list_add(&shadow_nodes, &node->private_list);
1636 if (!list_empty(&node->private_list))
1637 list_del_init(&node->private_list);
1641 static noinline void shadow_remove(struct xarray *xa)
1643 struct xa_node *node;
1646 while ((node = list_first_entry_or_null(&shadow_nodes,
1647 struct xa_node, private_list))) {
1648 XA_BUG_ON(xa, node->array != xa);
1649 list_del_init(&node->private_list);
1650 xa_delete_node(node, test_update_node);
1655 static noinline void check_workingset(struct xarray *xa, unsigned long index)
1657 XA_STATE(xas, xa, index);
1658 xas_set_update(&xas, test_update_node);
1662 xas_store(&xas, xa_mk_value(0));
1664 xas_store(&xas, xa_mk_value(1));
1666 } while (xas_nomem(&xas, GFP_KERNEL));
1668 XA_BUG_ON(xa, list_empty(&shadow_nodes));
1672 xas_store(&xas, &xas);
1673 XA_BUG_ON(xa, !list_empty(&shadow_nodes));
1675 xas_store(&xas, xa_mk_value(2));
1677 XA_BUG_ON(xa, list_empty(&shadow_nodes));
1680 XA_BUG_ON(xa, !list_empty(&shadow_nodes));
1681 XA_BUG_ON(xa, !xa_empty(xa));
1685 * Check that the pointer / value / sibling entries are accounted the
1686 * way we expect them to be.
1688 static noinline void check_account(struct xarray *xa)
1690 #ifdef CONFIG_XARRAY_MULTI
1693 for (order = 1; order < 12; order++) {
1694 XA_STATE(xas, xa, 1 << order);
1696 xa_store_order(xa, 0, order, xa, GFP_KERNEL);
1699 XA_BUG_ON(xa, xas.xa_node->count == 0);
1700 XA_BUG_ON(xa, xas.xa_node->count > (1 << order));
1701 XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
1704 xa_store_order(xa, 1 << order, order, xa_mk_index(1UL << order),
1706 XA_BUG_ON(xa, xas.xa_node->count != xas.xa_node->nr_values * 2);
1708 xa_erase(xa, 1 << order);
1709 XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
1712 XA_BUG_ON(xa, !xa_empty(xa));
1717 static noinline void check_get_order(struct xarray *xa)
1719 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
1723 for (i = 0; i < 3; i++)
1724 XA_BUG_ON(xa, xa_get_order(xa, i) != 0);
1726 for (order = 0; order < max_order; order++) {
1727 for (i = 0; i < 10; i++) {
1728 xa_store_order(xa, i << order, order,
1729 xa_mk_index(i << order), GFP_KERNEL);
1730 for (j = i << order; j < (i + 1) << order; j++)
1731 XA_BUG_ON(xa, xa_get_order(xa, j) != order);
1732 xa_erase(xa, i << order);
1737 static noinline void check_destroy(struct xarray *xa)
1739 unsigned long index;
1741 XA_BUG_ON(xa, !xa_empty(xa));
1743 /* Destroying an empty array is a no-op */
1745 XA_BUG_ON(xa, !xa_empty(xa));
1747 /* Destroying an array with a single entry */
1748 for (index = 0; index < 1000; index++) {
1749 xa_store_index(xa, index, GFP_KERNEL);
1750 XA_BUG_ON(xa, xa_empty(xa));
1752 XA_BUG_ON(xa, !xa_empty(xa));
1755 /* Destroying an array with a single entry at ULONG_MAX */
1756 xa_store(xa, ULONG_MAX, xa, GFP_KERNEL);
1757 XA_BUG_ON(xa, xa_empty(xa));
1759 XA_BUG_ON(xa, !xa_empty(xa));
1761 #ifdef CONFIG_XARRAY_MULTI
1762 /* Destroying an array with a multi-index entry */
1763 xa_store_order(xa, 1 << 11, 11, xa, GFP_KERNEL);
1764 XA_BUG_ON(xa, xa_empty(xa));
1766 XA_BUG_ON(xa, !xa_empty(xa));
1770 static DEFINE_XARRAY(array);
1772 static int xarray_checks(void)
1774 check_xa_err(&array);
1775 check_xas_retry(&array);
1776 check_xa_load(&array);
1777 check_xa_mark(&array);
1778 check_xa_shrink(&array);
1779 check_xas_erase(&array);
1780 check_insert(&array);
1781 check_cmpxchg(&array);
1782 check_reserve(&array);
1783 check_reserve(&xa0);
1784 check_multi_store(&array);
1785 check_get_order(&array);
1788 check_find_entry(&array);
1789 check_pause(&array);
1790 check_account(&array);
1791 check_destroy(&array);
1793 check_create_range(&array);
1794 check_store_range(&array);
1795 check_store_iter(&array);
1797 check_split(&array);
1799 check_workingset(&array, 0);
1800 check_workingset(&array, 64);
1801 check_workingset(&array, 4096);
1803 printk("XArray: %u of %u tests passed\n", tests_passed, tests_run);
1804 return (tests_run == tests_passed) ? 0 : -EINVAL;
1807 static void xarray_exit(void)
1811 module_init(xarray_checks);
1812 module_exit(xarray_exit);
1813 MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
1814 MODULE_LICENSE("GPL");