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 '' 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
1453 static noinline void check_move_tiny(struct xarray *xa)
1454 {
1455 XA_STATE(xas, xa, 0);
1456
1457 XA_BUG_ON(xa, !xa_empty(xa));
1458 rcu_read_lock();
1459 XA_BUG_ON(xa, xas_next(&xas) != NULL);
1460 XA_BUG_ON(xa, xas_next(&xas) != NULL);
1461 rcu_read_unlock();
1462 xa_store_index(xa, 0, GFP_KERNEL);
1463 rcu_read_lock();
1464 xas_set(&xas, 0);
1465 XA_BUG_ON(xa, xas_next(&xas) != xa_mk_index(0));
1466 XA_BUG_ON(xa, xas_next(&xas) != NULL);
1467 xas_set(&xas, 0);
1468 XA_BUG_ON(xa, xas_prev(&xas) != xa_mk_index(0));
1469 XA_BUG_ON(xa, xas_prev(&xas) != NULL);
1470 rcu_read_unlock();
1471 xa_erase_index(xa, 0);
1472 XA_BUG_ON(xa, !xa_empty(xa));
1473 }
1474
1475 static noinline void check_move_max(struct xarray *xa)
1476 {
1477 XA_STATE(xas, xa, 0);
1478
1479 xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
1480 rcu_read_lock();
1481 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_index(ULONG_MAX));
1482 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != NULL);
1483 rcu_read_unlock();
1484
1485 xas_set(&xas, 0);
1486 rcu_read_lock();
1487 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_index(ULONG_MAX));
1488 xas_pause(&xas);
1489 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != NULL);
1490 rcu_read_unlock();
1491
1492 xa_erase_index(xa, ULONG_MAX);
1493 XA_BUG_ON(xa, !xa_empty(xa));
1494 }
1495
1496 static noinline void check_move_small(struct xarray *xa, unsigned long idx)
1497 {
1498 XA_STATE(xas, xa, 0);
1499 unsigned long i;
1500
1501 xa_store_index(xa, 0, GFP_KERNEL);
1502 xa_store_index(xa, idx, GFP_KERNEL);
1503
1504 rcu_read_lock();
1505 for (i = 0; i < idx * 4; i++) {
1506 void *entry = xas_next(&xas);
1507 if (i <= idx)
1508 XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
1509 XA_BUG_ON(xa, xas.xa_index != i);
1510 if (i == 0 || i == idx)
1511 XA_BUG_ON(xa, entry != xa_mk_index(i));
1512 else
1513 XA_BUG_ON(xa, entry != NULL);
1514 }
1515 xas_next(&xas);
1516 XA_BUG_ON(xa, xas.xa_index != i);
1517
1518 do {
1519 void *entry = xas_prev(&xas);
1520 i--;
1521 if (i <= idx)
1522 XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
1523 XA_BUG_ON(xa, xas.xa_index != i);
1524 if (i == 0 || i == idx)
1525 XA_BUG_ON(xa, entry != xa_mk_index(i));
1526 else
1527 XA_BUG_ON(xa, entry != NULL);
1528 } while (i > 0);
1529
1530 xas_set(&xas, ULONG_MAX);
1531 XA_BUG_ON(xa, xas_next(&xas) != NULL);
1532 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
1533 XA_BUG_ON(xa, xas_next(&xas) != xa_mk_value(0));
1534 XA_BUG_ON(xa, xas.xa_index != 0);
1535 XA_BUG_ON(xa, xas_prev(&xas) != NULL);
1536 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
1537 rcu_read_unlock();
1538
1539 xa_erase_index(xa, 0);
1540 xa_erase_index(xa, idx);
1541 XA_BUG_ON(xa, !xa_empty(xa));
1542 }
1543
1544 static noinline void check_move(struct xarray *xa)
1545 {
1546 XA_STATE(xas, xa, (1 << 16) - 1);
1547 unsigned long i;
1548
1549 for (i = 0; i < (1 << 16); i++)
1550 XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
1551
1552 rcu_read_lock();
1553 do {
1554 void *entry = xas_prev(&xas);
1555 i--;
1556 XA_BUG_ON(xa, entry != xa_mk_index(i));
1557 XA_BUG_ON(xa, i != xas.xa_index);
1558 } while (i != 0);
1559
1560 XA_BUG_ON(xa, xas_prev(&xas) != NULL);
1561 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
1562
1563 do {
1564 void *entry = xas_next(&xas);
1565 XA_BUG_ON(xa, entry != xa_mk_index(i));
1566 XA_BUG_ON(xa, i != xas.xa_index);
1567 i++;
1568 } while (i < (1 << 16));
1569 rcu_read_unlock();
1570
1571 for (i = (1 << 8); i < (1 << 15); i++)
1572 xa_erase_index(xa, i);
1573
1574 i = xas.xa_index;
1575
1576 rcu_read_lock();
1577 do {
1578 void *entry = xas_prev(&xas);
1579 i--;
1580 if ((i < (1 << 8)) || (i >= (1 << 15)))
1581 XA_BUG_ON(xa, entry != xa_mk_index(i));
1582 else
1583 XA_BUG_ON(xa, entry != NULL);
1584 XA_BUG_ON(xa, i != xas.xa_index);
1585 } while (i != 0);
1586
1587 XA_BUG_ON(xa, xas_prev(&xas) != NULL);
1588 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
1589
1590 do {
1591 void *entry = xas_next(&xas);
1592 if ((i < (1 << 8)) || (i >= (1 << 15)))
1593 XA_BUG_ON(xa, entry != xa_mk_index(i));
1594 else
1595 XA_BUG_ON(xa, entry != NULL);
1596 XA_BUG_ON(xa, i != xas.xa_index);
1597 i++;
1598 } while (i < (1 << 16));
1599 rcu_read_unlock();
1600
1601 xa_destroy(xa);
1602
1603 check_move_tiny(xa);
1604 check_move_max(xa);
1605
1606 for (i = 0; i < 16; i++)
1607 check_move_small(xa, 1UL << i);
1608
1609 for (i = 2; i < 16; i++)
1610 check_move_small(xa, (1UL << i) - 1);
1611 }
1612
1613 static noinline void xa_store_many_order(struct xarray *xa,
1614 unsigned long index, unsigned order)
1615 {
1616 XA_STATE_ORDER(xas, xa, index, order);
1617 unsigned int i = 0;
1618
1619 do {
1620 xas_lock(&xas);
1621 XA_BUG_ON(xa, xas_find_conflict(&xas));
1622 xas_create_range(&xas);
1623 if (xas_error(&xas))
1624 goto unlock;
1625 for (i = 0; i < (1U << order); i++) {
1626 XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(index + i)));
1627 xas_next(&xas);
1628 }
1629 unlock:
1630 xas_unlock(&xas);
1631 } while (xas_nomem(&xas, GFP_KERNEL));
1632
1633 XA_BUG_ON(xa, xas_error(&xas));
1634 }
1635
1636 static noinline void check_create_range_1(struct xarray *xa,
1637 unsigned long index, unsigned order)
1638 {
1639 unsigned long i;
1640
1641 xa_store_many_order(xa, index, order);
1642 for (i = index; i < index + (1UL << order); i++)
1643 xa_erase_index(xa, i);
1644 XA_BUG_ON(xa, !xa_empty(xa));
1645 }
1646
1647 static noinline void check_create_range_2(struct xarray *xa, unsigned order)
1648 {
1649 unsigned long i;
1650 unsigned long nr = 1UL << order;
1651
1652 for (i = 0; i < nr * nr; i += nr)
1653 xa_store_many_order(xa, i, order);
1654 for (i = 0; i < nr * nr; i++)
1655 xa_erase_index(xa, i);
1656 XA_BUG_ON(xa, !xa_empty(xa));
1657 }
1658
1659 static noinline void check_create_range_3(void)
1660 {
1661 XA_STATE(xas, NULL, 0);
1662 xas_set_err(&xas, -EEXIST);
1663 xas_create_range(&xas);
1664 XA_BUG_ON(NULL, xas_error(&xas) != -EEXIST);
1665 }
1666
1667 static noinline void check_create_range_4(struct xarray *xa,
1668 unsigned long index, unsigned order)
1669 {
1670 XA_STATE_ORDER(xas, xa, index, order);
1671 unsigned long base = xas.xa_index;
1672 unsigned long i = 0;
1673
1674 xa_store_index(xa, index, GFP_KERNEL);
1675 do {
1676 xas_lock(&xas);
1677 xas_create_range(&xas);
1678 if (xas_error(&xas))
1679 goto unlock;
1680 for (i = 0; i < (1UL << order); i++) {
1681 void *old = xas_store(&xas, xa_mk_index(base + i));
1682 if (xas.xa_index == index)
1683 XA_BUG_ON(xa, old != xa_mk_index(base + i));
1684 else
1685 XA_BUG_ON(xa, old != NULL);
1686 xas_next(&xas);
1687 }
1688 unlock:
1689 xas_unlock(&xas);
1690 } while (xas_nomem(&xas, GFP_KERNEL));
1691
1692 XA_BUG_ON(xa, xas_error(&xas));
1693
1694 for (i = base; i < base + (1UL << order); i++)
1695 xa_erase_index(xa, i);
1696 XA_BUG_ON(xa, !xa_empty(xa));
1697 }
1698
1699 static noinline void check_create_range_5(struct xarray *xa,
1700 unsigned long index, unsigned int order)
1701 {
1702 XA_STATE_ORDER(xas, xa, index, order);
1703 unsigned int i;
1704
1705 xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
1706
1707 for (i = 0; i < order + 10; i++) {
1708 do {
1709 xas_lock(&xas);
1710 xas_create_range(&xas);
1711 xas_unlock(&xas);
1712 } while (xas_nomem(&xas, GFP_KERNEL));
1713 }
1714
1715 xa_destroy(xa);
1716 }
1717
1718 static noinline void check_create_range(struct xarray *xa)
1719 {
1720 unsigned int order;
1721 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 12 : 1;
1722
1723 for (order = 0; order < max_order; order++) {
1724 check_create_range_1(xa, 0, order);
1725 check_create_range_1(xa, 1U << order, order);
1726 check_create_range_1(xa, 2U << order, order);
1727 check_create_range_1(xa, 3U << order, order);
1728 check_create_range_1(xa, 1U << 24, order);
1729 if (order < 10)
1730 check_create_range_2(xa, order);
1731
1732 check_create_range_4(xa, 0, order);
1733 check_create_range_4(xa, 1U << order, order);
1734 check_create_range_4(xa, 2U << order, order);
1735 check_create_range_4(xa, 3U << order, order);
1736 check_create_range_4(xa, 1U << 24, order);
1737
1738 check_create_range_4(xa, 1, order);
1739 check_create_range_4(xa, (1U << order) + 1, order);
1740 check_create_range_4(xa, (2U << order) + 1, order);
1741 check_create_range_4(xa, (2U << order) - 1, order);
1742 check_create_range_4(xa, (3U << order) + 1, order);
1743 check_create_range_4(xa, (3U << order) - 1, order);
1744 check_create_range_4(xa, (1U << 24) + 1, order);
1745
1746 check_create_range_5(xa, 0, order);
1747 check_create_range_5(xa, (1U << order), order);
1748 }
1749
1750 check_create_range_3();
1751 }
1752
1753 static noinline void __check_store_range(struct xarray *xa, unsigned long first,
1754 unsigned long last)
1755 {
1756 #ifdef CONFIG_XARRAY_MULTI
1757 xa_store_range(xa, first, last, xa_mk_index(first), GFP_KERNEL);
1758
1759 XA_BUG_ON(xa, xa_load(xa, first) != xa_mk_index(first));
1760 XA_BUG_ON(xa, xa_load(xa, last) != xa_mk_index(first));
1761 XA_BUG_ON(xa, xa_load(xa, first - 1) != NULL);
1762 XA_BUG_ON(xa, xa_load(xa, last + 1) != NULL);
1763
1764 xa_store_range(xa, first, last, NULL, GFP_KERNEL);
1765 #endif
1766
1767 XA_BUG_ON(xa, !xa_empty(xa));
1768 }
1769
1770 static noinline void check_store_range(struct xarray *xa)
1771 {
1772 unsigned long i, j;
1773
1774 for (i = 0; i < 128; i++) {
1775 for (j = i; j < 128; j++) {
1776 __check_store_range(xa, i, j);
1777 __check_store_range(xa, 128 + i, 128 + j);
1778 __check_store_range(xa, 4095 + i, 4095 + j);
1779 __check_store_range(xa, 4096 + i, 4096 + j);
1780 __check_store_range(xa, 123456 + i, 123456 + j);
1781 __check_store_range(xa, (1 << 24) + i, (1 << 24) + j);
1782 }
1783 }
1784 }
1785
1786 #ifdef CONFIG_XARRAY_MULTI
1787 static void check_split_1(struct xarray *xa, unsigned long index,
1788 unsigned int order, unsigned int new_order)
1789 {
1790 XA_STATE_ORDER(xas, xa, index, new_order);
1791 unsigned int i, found;
1792 void *entry;
1793
1794 xa_store_order(xa, index, order, xa, GFP_KERNEL);
1795 xa_set_mark(xa, index, XA_MARK_1);
1796
1797 xas_split_alloc(&xas, xa, order, GFP_KERNEL);
1798 xas_lock(&xas);
1799 xas_split(&xas, xa, order);
1800 for (i = 0; i < (1 << order); i += (1 << new_order))
1801 __xa_store(xa, index + i, xa_mk_index(index + i), 0);
1802 xas_unlock(&xas);
1803
1804 for (i = 0; i < (1 << order); i++) {
1805 unsigned int val = index + (i & ~((1 << new_order) - 1));
1806 XA_BUG_ON(xa, xa_load(xa, index + i) != xa_mk_index(val));
1807 }
1808
1809 xa_set_mark(xa, index, XA_MARK_0);
1810 XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
1811
1812 xas_set_order(&xas, index, 0);
1813 found = 0;
1814 rcu_read_lock();
1815 xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_1) {
1816 found++;
1817 XA_BUG_ON(xa, xa_is_internal(entry));
1818 }
1819 rcu_read_unlock();
1820 XA_BUG_ON(xa, found != 1 << (order - new_order));
1821
1822 xa_destroy(xa);
1823 }
1824
1825 static noinline void check_split(struct xarray *xa)
1826 {
1827 unsigned int order, new_order;
1828
1829 XA_BUG_ON(xa, !xa_empty(xa));
1830
1831 for (order = 1; order < 2 * XA_CHUNK_SHIFT; order++) {
1832 for (new_order = 0; new_order < order; new_order++) {
1833 check_split_1(xa, 0, order, new_order);
1834 check_split_1(xa, 1UL << order, order, new_order);
1835 check_split_1(xa, 3UL << order, order, new_order);
1836 }
1837 }
1838 }
1839 #else
1840 static void check_split(struct xarray *xa) { }
1841 #endif
1842
1843 static void check_align_1(struct xarray *xa, char *name)
1844 {
1845 int i;
1846 unsigned int id;
1847 unsigned long index;
1848 void *entry;
1849
1850 for (i = 0; i < 8; i++) {
1851 XA_BUG_ON(xa, xa_alloc(xa, &id, name + i, xa_limit_32b,
1852 GFP_KERNEL) != 0);
1853 XA_BUG_ON(xa, id != i);
1854 }
1855 xa_for_each(xa, index, entry)
1856 XA_BUG_ON(xa, xa_is_err(entry));
1857 xa_destroy(xa);
1858 }
1859
1860 /*
1861 * We should always be able to store without allocating memory after
1862 * reserving a slot.
1863 */
1864 static void check_align_2(struct xarray *xa, char *name)
1865 {
1866 int i;
1867
1868 XA_BUG_ON(xa, !xa_empty(xa));
1869
1870 for (i = 0; i < 8; i++) {
1871 XA_BUG_ON(xa, xa_store(xa, 0, name + i, GFP_KERNEL) != NULL);
1872 xa_erase(xa, 0);
1873 }
1874
1875 for (i = 0; i < 8; i++) {
1876 XA_BUG_ON(xa, xa_reserve(xa, 0, GFP_KERNEL) != 0);
1877 XA_BUG_ON(xa, xa_store(xa, 0, name + i, 0) != NULL);
1878 xa_erase(xa, 0);
1879 }
1880
1881 XA_BUG_ON(xa, !xa_empty(xa));
1882 }
1883
1884 static noinline void check_align(struct xarray *xa)
1885 {
1886 char name[] = "Motorola 68000";
1887
1888 check_align_1(xa, name);
1889 check_align_1(xa, name + 1);
1890 check_align_1(xa, name + 2);
1891 check_align_1(xa, name + 3);
1892 check_align_2(xa, name);
1893 }
1894
1895 static LIST_HEAD(shadow_nodes);
1896
1897 static void test_update_node(struct xa_node *node)
1898 {
1899 if (node->count && node->count == node->nr_values) {
1900 if (list_empty(&node->private_list))
1901 list_add(&shadow_nodes, &node->private_list);
1902 } else {
1903 if (!list_empty(&node->private_list))
1904 list_del_init(&node->private_list);
1905 }
1906 }
1907
1908 static noinline void shadow_remove(struct xarray *xa)
1909 {
1910 struct xa_node *node;
1911
1912 xa_lock(xa);
1913 while ((node = list_first_entry_or_null(&shadow_nodes,
1914 struct xa_node, private_list))) {
1915 XA_BUG_ON(xa, node->array != xa);
1916 list_del_init(&node->private_list);
1917 xa_delete_node(node, test_update_node);
1918 }
1919 xa_unlock(xa);
1920 }
1921
1922 static noinline void check_workingset(struct xarray *xa, unsigned long index)
1923 {
1924 XA_STATE(xas, xa, index);
1925 xas_set_update(&xas, test_update_node);
1926
1927 do {
1928 xas_lock(&xas);
1929 xas_store(&xas, xa_mk_value(0));
1930 xas_next(&xas);
1931 xas_store(&xas, xa_mk_value(1));
1932 xas_unlock(&xas);
1933 } while (xas_nomem(&xas, GFP_KERNEL));
1934
1935 XA_BUG_ON(xa, list_empty(&shadow_nodes));
1936
1937 xas_lock(&xas);
1938 xas_next(&xas);
1939 xas_store(&xas, &xas);
1940 XA_BUG_ON(xa, !list_empty(&shadow_nodes));
1941
1942 xas_store(&xas, xa_mk_value(2));
1943 xas_unlock(&xas);
1944 XA_BUG_ON(xa, list_empty(&shadow_nodes));
1945
1946 shadow_remove(xa);
1947 XA_BUG_ON(xa, !list_empty(&shadow_nodes));
1948 XA_BUG_ON(xa, !xa_empty(xa));
1949 }
1950
1951 /*
1952 * Check that the pointer / value / sibling entries are accounted the
1953 * way we expect them to be.
1954 */
1955 static noinline void check_account(struct xarray *xa)
1956 {
1957 #ifdef CONFIG_XARRAY_MULTI
1958 unsigned int order;
1959
1960 for (order = 1; order < 12; order++) {
1961 XA_STATE(xas, xa, 1 << order);
1962
1963 xa_store_order(xa, 0, order, xa, GFP_KERNEL);
1964 rcu_read_lock();
1965 xas_load(&xas);
1966 XA_BUG_ON(xa, xas.xa_node->count == 0);
1967 XA_BUG_ON(xa, xas.xa_node->count > (1 << order));
1968 XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
1969 rcu_read_unlock();
1970
1971 xa_store_order(xa, 1 << order, order, xa_mk_index(1UL << order),
1972 GFP_KERNEL);
1973 XA_BUG_ON(xa, xas.xa_node->count != xas.xa_node->nr_values * 2);
1974
1975 xa_erase(xa, 1 << order);
1976 XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
1977
1978 xa_erase(xa, 0);
1979 XA_BUG_ON(xa, !xa_empty(xa));
1980 }
1981 #endif
1982 }
1983
1984 static noinline void check_get_order(struct xarray *xa)
1985 {
1986 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
1987 unsigned int order;
1988 unsigned long i, j;
1989
1990 for (i = 0; i < 3; i++)
1991 XA_BUG_ON(xa, xa_get_order(xa, i) != 0);
1992
1993 for (order = 0; order < max_order; order++) {
1994 for (i = 0; i < 10; i++) {
1995 xa_store_order(xa, i << order, order,
1996 xa_mk_index(i << order), GFP_KERNEL);
1997 for (j = i << order; j < (i + 1) << order; j++)
1998 XA_BUG_ON(xa, xa_get_order(xa, j) != order);
1999 xa_erase(xa, i << order);
2000 }
2001 }
2002 }
2003
2004 static noinline void check_xas_get_order(struct xarray *xa)
2005 {
2006 XA_STATE(xas, xa, 0);
2007
2008 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
2009 unsigned int order;
2010 unsigned long i, j;
2011
2012 for (order = 0; order < max_order; order++) {
2013 for (i = 0; i < 10; i++) {
2014 xas_set_order(&xas, i << order, order);
2015 do {
2016 xas_lock(&xas);
2017 xas_store(&xas, xa_mk_value(i));
2018 xas_unlock(&xas);
2019 } while (xas_nomem(&xas, GFP_KERNEL));
2020
2021 for (j = i << order; j < (i + 1) << order; j++) {
2022 xas_set_order(&xas, j, 0);
2023 rcu_read_lock();
2024 xas_load(&xas);
2025 XA_BUG_ON(xa, xas_get_order(&xas) != order);
2026 rcu_read_unlock();
2027 }
2028
2029 xas_lock(&xas);
2030 xas_set_order(&xas, i << order, order);
2031 xas_store(&xas, NULL);
2032 xas_unlock(&xas);
2033 }
2034 }
2035 }
2036
2037 static noinline void check_xas_conflict_get_order(struct xarray *xa)
2038 {
2039 XA_STATE(xas, xa, 0);
2040
2041 void *entry;
2042 int only_once;
2043 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
2044 unsigned int order;
2045 unsigned long i, j, k;
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 /*
2057 * Ensure xas_get_order works with xas_for_each_conflict.
2058 */
2059 j = i << order;
2060 for (k = 0; k < order; k++) {
2061 only_once = 0;
2062 xas_set_order(&xas, j + (1 << k), k);
2063 xas_lock(&xas);
2064 xas_for_each_conflict(&xas, entry) {
2065 XA_BUG_ON(xa, entry != xa_mk_value(i));
2066 XA_BUG_ON(xa, xas_get_order(&xas) != order);
2067 only_once++;
2068 }
2069 XA_BUG_ON(xa, only_once != 1);
2070 xas_unlock(&xas);
2071 }
2072
2073 if (order < max_order - 1) {
2074 only_once = 0;
2075 xas_set_order(&xas, (i & ~1UL) << order, order + 1);
2076 xas_lock(&xas);
2077 xas_for_each_conflict(&xas, entry) {
2078 XA_BUG_ON(xa, entry != xa_mk_value(i));
2079 XA_BUG_ON(xa, xas_get_order(&xas) != order);
2080 only_once++;
2081 }
2082 XA_BUG_ON(xa, only_once != 1);
2083 xas_unlock(&xas);
2084 }
2085
2086 xas_set_order(&xas, i << order, order);
2087 xas_lock(&xas);
2088 xas_store(&xas, NULL);
2089 xas_unlock(&xas);
2090 }
2091 }
2092 }
2093
2094
2095 static noinline void check_destroy(struct xarray *xa)
2096 {
2097 unsigned long index;
2098
2099 XA_BUG_ON(xa, !xa_empty(xa));
2100
2101 /* Destroying an empty array is a no-op */
2102 xa_destroy(xa);
2103 XA_BUG_ON(xa, !xa_empty(xa));
2104
2105 /* Destroying an array with a single entry */
2106 for (index = 0; index < 1000; index++) {
2107 xa_store_index(xa, index, GFP_KERNEL);
2108 XA_BUG_ON(xa, xa_empty(xa));
2109 xa_destroy(xa);
2110 XA_BUG_ON(xa, !xa_empty(xa));
2111 }
2112
2113 /* Destroying an array with a single entry at ULONG_MAX */
2114 xa_store(xa, ULONG_MAX, xa, GFP_KERNEL);
2115 XA_BUG_ON(xa, xa_empty(xa));
2116 xa_destroy(xa);
2117 XA_BUG_ON(xa, !xa_empty(xa));
2118
2119 #ifdef CONFIG_XARRAY_MULTI
2120 /* Destroying an array with a multi-index entry */
2121 xa_store_order(xa, 1 << 11, 11, xa, GFP_KERNEL);
2122 XA_BUG_ON(xa, xa_empty(xa));
2123 xa_destroy(xa);
2124 XA_BUG_ON(xa, !xa_empty(xa));
2125 #endif
2126 }
2127
2128 static DEFINE_XARRAY(array);
2129
2130 static int xarray_checks(void)
2131 {
2132 check_xa_err(&array);
2133 check_xas_retry(&array);
2134 check_xa_load(&array);
2135 check_xa_mark(&array);
2136 check_xa_shrink(&array);
2137 check_xas_erase(&array);
2138 check_insert(&array);
2139 check_cmpxchg(&array);
2140 check_cmpxchg_order(&array);
2141 check_reserve(&array);
2142 check_reserve(&xa0);
2143 check_multi_store(&array);
2144 check_multi_store_advanced(&array);
2145 check_get_order(&array);
2146 check_xas_get_order(&array);
2147 check_xas_conflict_get_order(&array);
2148 check_xa_alloc();
2149 check_find(&array);
2150 check_find_entry(&array);
2151 check_pause(&array);
2152 check_account(&array);
2153 check_destroy(&array);
2154 check_move(&array);
2155 check_create_range(&array);
2156 check_store_range(&array);
2157 check_store_iter(&array);
2158 check_align(&xa0);
2159 check_split(&array);
2160
2161 check_workingset(&array, 0);
2162 check_workingset(&array, 64);
2163 check_workingset(&array, 4096);
2164
2165 printk("XArray: %u of %u tests passed\n", tests_passed, tests_run);
2166 return (tests_run == tests_passed) ? 0 : -EINVAL;
2167 }
2168
2169 static void xarray_exit(void)
2170 {
2171 }
2172
2173 module_init(xarray_checks);
2174 module_exit(xarray_exit);
2175 MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
2176 MODULE_DESCRIPTION("XArray API test module");
2177 MODULE_LICENSE("GPL");
2178
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