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__
xa_dump(const struct xarray * xa)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
xa_mk_index(unsigned long index)35 static void *xa_mk_index(unsigned long index)
36 {
37 return xa_mk_value(index & LONG_MAX);
38 }
39
xa_store_index(struct xarray * xa,unsigned long index,gfp_t gfp)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
xa_insert_index(struct xarray * xa,unsigned long index)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
xa_alloc_index(struct xarray * xa,unsigned long index,gfp_t gfp)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
xa_erase_index(struct xarray * xa,unsigned long index)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 */
xa_store_order(struct xarray * xa,unsigned long index,unsigned order,void * entry,gfp_t gfp)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
check_xa_err(struct xarray * xa)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
check_xas_retry(struct xarray * xa)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
check_xa_load(struct xarray * xa)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
check_xa_mark_1(struct xarray * xa,unsigned long index)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
check_xa_mark_2(struct xarray * xa)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
check_xa_mark_3(struct xarray * xa)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
check_xa_mark(struct xarray * xa)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
check_xa_shrink(struct xarray * xa)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
check_insert(struct xarray * xa)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
check_cmpxchg(struct xarray * xa)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
check_reserve(struct xarray * xa)426 static noinline void check_reserve(struct xarray *xa)
427 {
428 void *entry;
429 unsigned long index;
430 int count;
431
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));
439
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));
446
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));
454
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) !=
458 -EBUSY);
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));
462
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);
467
468 count = 0;
469 xa_for_each(xa, index, entry) {
470 XA_BUG_ON(xa, index != 5 && index != 7);
471 count++;
472 }
473 XA_BUG_ON(xa, count != 2);
474
475 /* If we free a reserved entry, we should be able to allocate it */
476 if (xa->xa_flags & XA_FLAGS_ALLOC) {
477 u32 id;
478
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);
482
483 xa_release(xa, 6);
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);
487 }
488
489 xa_destroy(xa);
490 }
491
check_xas_erase(struct xarray * xa)492 static noinline void check_xas_erase(struct xarray *xa)
493 {
494 XA_STATE(xas, xa, 0);
495 void *entry;
496 unsigned long i, j;
497
498 for (i = 0; i < 200; i++) {
499 for (j = i; j < 2 * i + 17; j++) {
500 xas_set(&xas, j);
501 do {
502 xas_lock(&xas);
503 xas_store(&xas, xa_mk_index(j));
504 xas_unlock(&xas);
505 } while (xas_nomem(&xas, GFP_KERNEL));
506 }
507
508 xas_set(&xas, ULONG_MAX);
509 do {
510 xas_lock(&xas);
511 xas_store(&xas, xa_mk_value(0));
512 xas_unlock(&xas);
513 } while (xas_nomem(&xas, GFP_KERNEL));
514
515 xas_lock(&xas);
516 xas_store(&xas, NULL);
517
518 xas_set(&xas, 0);
519 j = i;
520 xas_for_each(&xas, entry, ULONG_MAX) {
521 XA_BUG_ON(xa, entry != xa_mk_index(j));
522 xas_store(&xas, NULL);
523 j++;
524 }
525 xas_unlock(&xas);
526 XA_BUG_ON(xa, !xa_empty(xa));
527 }
528 }
529
530 #ifdef CONFIG_XARRAY_MULTI
check_multi_store_1(struct xarray * xa,unsigned long index,unsigned int order)531 static noinline void check_multi_store_1(struct xarray *xa, unsigned long index,
532 unsigned int order)
533 {
534 XA_STATE(xas, xa, index);
535 unsigned long min = index & ~((1UL << order) - 1);
536 unsigned long max = min + (1UL << order);
537
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);
543
544 xas_lock(&xas);
545 XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(min)) != xa_mk_index(index));
546 xas_unlock(&xas);
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);
551
552 xa_erase_index(xa, min);
553 XA_BUG_ON(xa, !xa_empty(xa));
554 }
555
check_multi_store_2(struct xarray * xa,unsigned long index,unsigned int order)556 static noinline void check_multi_store_2(struct xarray *xa, unsigned long index,
557 unsigned int order)
558 {
559 XA_STATE(xas, xa, index);
560 xa_store_order(xa, index, order, xa_mk_value(0), GFP_KERNEL);
561
562 xas_lock(&xas);
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));
566 xas_unlock(&xas);
567 XA_BUG_ON(xa, !xa_empty(xa));
568 }
569
check_multi_store_3(struct xarray * xa,unsigned long index,unsigned int order)570 static noinline void check_multi_store_3(struct xarray *xa, unsigned long index,
571 unsigned int order)
572 {
573 XA_STATE(xas, xa, 0);
574 void *entry;
575 int n = 0;
576
577 xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
578
579 xas_lock(&xas);
580 xas_for_each(&xas, entry, ULONG_MAX) {
581 XA_BUG_ON(xa, entry != xa_mk_index(index));
582 n++;
583 }
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));
588 n++;
589 }
590 XA_BUG_ON(xa, n != 2);
591 xas_unlock(&xas);
592
593 xa_destroy(xa);
594 }
595 #endif
596
check_multi_store(struct xarray * xa)597 static noinline void check_multi_store(struct xarray *xa)
598 {
599 #ifdef CONFIG_XARRAY_MULTI
600 unsigned long i, j, k;
601 unsigned int max_order = (sizeof(long) == 4) ? 30 : 60;
602
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);
608 rcu_read_lock();
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);
611 rcu_read_unlock();
612
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);
618 rcu_read_lock();
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);
621 rcu_read_unlock();
622
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);
630 rcu_read_lock();
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);
633 rcu_read_unlock();
634
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));
638
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));
644
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);
649
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);
654 else
655 XA_BUG_ON(xa, entry != xa_mk_index(j));
656 }
657
658 xa_erase(xa, 0);
659 XA_BUG_ON(xa, !xa_empty(xa));
660 }
661 }
662
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);
667 }
668 check_multi_store_2(xa, 4095, 9);
669
670 for (i = 1; i < 20; i++) {
671 check_multi_store_3(xa, 0, i);
672 check_multi_store_3(xa, 1UL << i, i);
673 }
674 #endif
675 }
676
check_xa_alloc_1(struct xarray * xa,unsigned int base)677 static noinline void check_xa_alloc_1(struct xarray *xa, unsigned int base)
678 {
679 int i;
680 u32 id;
681
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);
685
686 /* Erasing it should make the array empty again */
687 xa_erase_index(xa, base);
688 XA_BUG_ON(xa, !xa_empty(xa));
689
690 /* And it should assign %base again */
691 xa_alloc_index(xa, base, GFP_KERNEL);
692
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);
699
700 /* Destroying the array should do the same as erasing */
701 xa_destroy(xa);
702
703 /* And it should assign %base again */
704 xa_alloc_index(xa, base, GFP_KERNEL);
705
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);
709
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);
713
714 /* If we then erase base, it should be free */
715 xa_erase_index(xa, base);
716 xa_alloc_index(xa, base, GFP_KERNEL);
717
718 xa_erase_index(xa, base + 1);
719 xa_erase_index(xa, base + 2);
720
721 for (i = 1; i < 5000; i++) {
722 xa_alloc_index(xa, base + i, GFP_KERNEL);
723 }
724
725 xa_destroy(xa);
726
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),
730 GFP_KERNEL) != 0);
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),
734 GFP_KERNEL) != 0);
735 XA_BUG_ON(xa, id != 0xffffffffU);
736 id = 3;
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);
741 xa_destroy(xa);
742
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));
750 }
751
check_xa_alloc_2(struct xarray * xa,unsigned int base)752 static noinline void check_xa_alloc_2(struct xarray *xa, unsigned int base)
753 {
754 unsigned int i, id;
755 unsigned long index;
756 void *entry;
757
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));
765
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));
771 xa_destroy(xa);
772 XA_BUG_ON(xa, !xa_empty(xa));
773
774 for (i = base; i < base + 10; i++) {
775 XA_BUG_ON(xa, xa_alloc(xa, &id, NULL, xa_limit_32b,
776 GFP_KERNEL) != 0);
777 XA_BUG_ON(xa, id != i);
778 }
779
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);
786
787 xa_for_each(xa, index, entry) {
788 xa_erase_index(xa, index);
789 }
790
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));
794 }
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));
799
800 xa_destroy(xa);
801 }
802
check_xa_alloc_3(struct xarray * xa,unsigned int base)803 static noinline void check_xa_alloc_3(struct xarray *xa, unsigned int base)
804 {
805 struct xa_limit limit = XA_LIMIT(1, 0x3fff);
806 u32 next = 0;
807 unsigned int i, id;
808 unsigned long index;
809 void *entry;
810
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);
814
815 next = 0x3ffd;
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));
822
823 for (i = 0x3ffe; i < 0x4003; i++) {
824 if (i < 0x4000)
825 entry = xa_mk_index(i);
826 else
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);
831 }
832
833 /* Check wrap-around is handled correctly */
834 if (base != 0)
835 xa_erase_index(xa, base);
836 xa_erase_index(xa, base + 1);
837 next = UINT_MAX;
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);
847
848 xa_for_each(xa, index, entry)
849 xa_erase_index(xa, index);
850
851 XA_BUG_ON(xa, !xa_empty(xa));
852 }
853
854 static DEFINE_XARRAY_ALLOC(xa0);
855 static DEFINE_XARRAY_ALLOC1(xa1);
856
check_xa_alloc(void)857 static noinline void check_xa_alloc(void)
858 {
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);
865 }
866
__check_store_iter(struct xarray * xa,unsigned long start,unsigned int order,unsigned int present)867 static noinline void __check_store_iter(struct xarray *xa, unsigned long start,
868 unsigned int order, unsigned int present)
869 {
870 XA_STATE_ORDER(xas, xa, start, order);
871 void *entry;
872 unsigned int count = 0;
873
874 retry:
875 xas_lock(&xas);
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));
880 count++;
881 }
882 xas_store(&xas, xa_mk_index(start));
883 xas_unlock(&xas);
884 if (xas_nomem(&xas, GFP_KERNEL)) {
885 count = 0;
886 goto retry;
887 }
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) !=
892 xa_mk_index(start));
893 xa_erase_index(xa, start);
894 }
895
check_store_iter(struct xarray * xa)896 static noinline void check_store_iter(struct xarray *xa)
897 {
898 unsigned int i, j;
899 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
900
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));
908
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));
915
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));
924 }
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);
930 #endif
931 XA_BUG_ON(xa, !xa_empty(xa));
932 }
933
check_multi_find_1(struct xarray * xa,unsigned order)934 static noinline void check_multi_find_1(struct xarray *xa, unsigned order)
935 {
936 #ifdef CONFIG_XARRAY_MULTI
937 unsigned long multi = 3 << order;
938 unsigned long next = 4 << order;
939 unsigned long index;
940
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);
944
945 index = 0;
946 XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
947 xa_mk_value(multi));
948 XA_BUG_ON(xa, index != multi);
949 index = multi + 1;
950 XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
951 xa_mk_value(multi));
952 XA_BUG_ON(xa, (index < multi) || (index >= next));
953 XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) !=
954 xa_mk_value(next));
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);
958
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));
963 #endif
964 }
965
check_multi_find_2(struct xarray * xa)966 static noinline void check_multi_find_2(struct xarray *xa)
967 {
968 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 10 : 1;
969 unsigned int i, j;
970 void *entry;
971
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),
978 GFP_KERNEL);
979 rcu_read_lock();
980 xas_for_each(&xas, entry, ULONG_MAX) {
981 xa_erase_index(xa, index);
982 }
983 rcu_read_unlock();
984 xa_erase_index(xa, index - 1);
985 XA_BUG_ON(xa, !xa_empty(xa));
986 }
987 }
988 }
989
check_multi_find_3(struct xarray * xa)990 static noinline void check_multi_find_3(struct xarray *xa)
991 {
992 unsigned int order;
993
994 for (order = 5; order < order_limit; order++) {
995 unsigned long index = 1UL << (order - 5);
996
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);
1001 }
1002 }
1003
check_find_1(struct xarray * xa)1004 static noinline void check_find_1(struct xarray *xa)
1005 {
1006 unsigned long i, j, k;
1007
1008 XA_BUG_ON(xa, !xa_empty(xa));
1009
1010 /*
1011 * Check xa_find with all pairs between 0 and 99 inclusive,
1012 * starting at every index between 0 and 99
1013 */
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) !=
1019 NULL);
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,
1024 XA_PRESENT);
1025 if (k <= j)
1026 XA_BUG_ON(xa, index != j);
1027 else if (k <= i)
1028 XA_BUG_ON(xa, index != i);
1029 else
1030 XA_BUG_ON(xa, entry != NULL);
1031
1032 index = k;
1033 entry = xa_find(xa, &index, ULONG_MAX,
1034 XA_MARK_0);
1035 if (k <= j)
1036 XA_BUG_ON(xa, index != j);
1037 else if (k <= i)
1038 XA_BUG_ON(xa, index != i);
1039 else
1040 XA_BUG_ON(xa, entry != NULL);
1041 }
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));
1045 }
1046 xa_erase_index(xa, i);
1047 XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_0));
1048 }
1049 XA_BUG_ON(xa, !xa_empty(xa));
1050 }
1051
check_find_2(struct xarray * xa)1052 static noinline void check_find_2(struct xarray *xa)
1053 {
1054 void *entry;
1055 unsigned long i, j, index;
1056
1057 xa_for_each(xa, index, entry) {
1058 XA_BUG_ON(xa, true);
1059 }
1060
1061 for (i = 0; i < 1024; i++) {
1062 xa_store_index(xa, index, GFP_KERNEL);
1063 j = 0;
1064 xa_for_each(xa, index, entry) {
1065 XA_BUG_ON(xa, xa_mk_index(index) != entry);
1066 XA_BUG_ON(xa, index != j++);
1067 }
1068 }
1069
1070 xa_destroy(xa);
1071 }
1072
check_find_3(struct xarray * xa)1073 static noinline void check_find_3(struct xarray *xa)
1074 {
1075 XA_STATE(xas, xa, 0);
1076 unsigned long i, j, k;
1077 void *entry;
1078
1079 for (i = 0; i < 100; i++) {
1080 for (j = 0; j < 100; j++) {
1081 rcu_read_lock();
1082 for (k = 0; k < 100; k++) {
1083 xas_set(&xas, j);
1084 xas_for_each_marked(&xas, entry, k, XA_MARK_0)
1085 ;
1086 if (j > k)
1087 XA_BUG_ON(xa,
1088 xas.xa_node != XAS_RESTART);
1089 }
1090 rcu_read_unlock();
1091 }
1092 xa_store_index(xa, i, GFP_KERNEL);
1093 xa_set_mark(xa, i, XA_MARK_0);
1094 }
1095 xa_destroy(xa);
1096 }
1097
check_find_4(struct xarray * xa)1098 static noinline void check_find_4(struct xarray *xa)
1099 {
1100 unsigned long index = 0;
1101 void *entry;
1102
1103 xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
1104
1105 entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1106 XA_BUG_ON(xa, entry != xa_mk_index(ULONG_MAX));
1107
1108 entry = xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT);
1109 XA_BUG_ON(xa, entry);
1110
1111 xa_erase_index(xa, ULONG_MAX);
1112 }
1113
check_find(struct xarray * xa)1114 static noinline void check_find(struct xarray *xa)
1115 {
1116 unsigned i;
1117
1118 check_find_1(xa);
1119 check_find_2(xa);
1120 check_find_3(xa);
1121 check_find_4(xa);
1122
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);
1127 }
1128
1129 /* See find_swap_entry() in mm/shmem.c */
xa_find_entry(struct xarray * xa,void * item)1130 static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
1131 {
1132 XA_STATE(xas, xa, 0);
1133 unsigned int checked = 0;
1134 void *entry;
1135
1136 rcu_read_lock();
1137 xas_for_each(&xas, entry, ULONG_MAX) {
1138 if (xas_retry(&xas, entry))
1139 continue;
1140 if (entry == item)
1141 break;
1142 checked++;
1143 if ((checked % 4) != 0)
1144 continue;
1145 xas_pause(&xas);
1146 }
1147 rcu_read_unlock();
1148
1149 return entry ? xas.xa_index : -1;
1150 }
1151
check_find_entry(struct xarray * xa)1152 static noinline void check_find_entry(struct xarray *xa)
1153 {
1154 #ifdef CONFIG_XARRAY_MULTI
1155 unsigned int order;
1156 unsigned long offset, index;
1157
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);
1169 }
1170 XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
1171 xa_destroy(xa);
1172 }
1173 }
1174 #endif
1175
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));
1182 }
1183
check_pause(struct xarray * xa)1184 static noinline void check_pause(struct xarray *xa)
1185 {
1186 XA_STATE(xas, xa, 0);
1187 void *entry;
1188 unsigned int order;
1189 unsigned long index = 1;
1190 unsigned int count = 0;
1191
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;
1196 }
1197
1198 rcu_read_lock();
1199 xas_for_each(&xas, entry, ULONG_MAX) {
1200 XA_BUG_ON(xa, entry != xa_mk_index(1UL << count));
1201 count++;
1202 }
1203 rcu_read_unlock();
1204 XA_BUG_ON(xa, count != order_limit);
1205
1206 count = 0;
1207 xas_set(&xas, 0);
1208 rcu_read_lock();
1209 xas_for_each(&xas, entry, ULONG_MAX) {
1210 XA_BUG_ON(xa, entry != xa_mk_index(1UL << count));
1211 count++;
1212 xas_pause(&xas);
1213 }
1214 rcu_read_unlock();
1215 XA_BUG_ON(xa, count != order_limit);
1216
1217 xa_destroy(xa);
1218 }
1219
check_move_tiny(struct xarray * xa)1220 static noinline void check_move_tiny(struct xarray *xa)
1221 {
1222 XA_STATE(xas, xa, 0);
1223
1224 XA_BUG_ON(xa, !xa_empty(xa));
1225 rcu_read_lock();
1226 XA_BUG_ON(xa, xas_next(&xas) != NULL);
1227 XA_BUG_ON(xa, xas_next(&xas) != NULL);
1228 rcu_read_unlock();
1229 xa_store_index(xa, 0, GFP_KERNEL);
1230 rcu_read_lock();
1231 xas_set(&xas, 0);
1232 XA_BUG_ON(xa, xas_next(&xas) != xa_mk_index(0));
1233 XA_BUG_ON(xa, xas_next(&xas) != NULL);
1234 xas_set(&xas, 0);
1235 XA_BUG_ON(xa, xas_prev(&xas) != xa_mk_index(0));
1236 XA_BUG_ON(xa, xas_prev(&xas) != NULL);
1237 rcu_read_unlock();
1238 xa_erase_index(xa, 0);
1239 XA_BUG_ON(xa, !xa_empty(xa));
1240 }
1241
check_move_max(struct xarray * xa)1242 static noinline void check_move_max(struct xarray *xa)
1243 {
1244 XA_STATE(xas, xa, 0);
1245
1246 xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
1247 rcu_read_lock();
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);
1250 rcu_read_unlock();
1251
1252 xas_set(&xas, 0);
1253 rcu_read_lock();
1254 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_index(ULONG_MAX));
1255 xas_pause(&xas);
1256 XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != NULL);
1257 rcu_read_unlock();
1258
1259 xa_erase_index(xa, ULONG_MAX);
1260 XA_BUG_ON(xa, !xa_empty(xa));
1261 }
1262
check_move_small(struct xarray * xa,unsigned long idx)1263 static noinline void check_move_small(struct xarray *xa, unsigned long idx)
1264 {
1265 XA_STATE(xas, xa, 0);
1266 unsigned long i;
1267
1268 xa_store_index(xa, 0, GFP_KERNEL);
1269 xa_store_index(xa, idx, GFP_KERNEL);
1270
1271 rcu_read_lock();
1272 for (i = 0; i < idx * 4; i++) {
1273 void *entry = xas_next(&xas);
1274 if (i <= idx)
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));
1279 else
1280 XA_BUG_ON(xa, entry != NULL);
1281 }
1282 xas_next(&xas);
1283 XA_BUG_ON(xa, xas.xa_index != i);
1284
1285 do {
1286 void *entry = xas_prev(&xas);
1287 i--;
1288 if (i <= idx)
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));
1293 else
1294 XA_BUG_ON(xa, entry != NULL);
1295 } while (i > 0);
1296
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);
1304 rcu_read_unlock();
1305
1306 xa_erase_index(xa, 0);
1307 xa_erase_index(xa, idx);
1308 XA_BUG_ON(xa, !xa_empty(xa));
1309 }
1310
check_move(struct xarray * xa)1311 static noinline void check_move(struct xarray *xa)
1312 {
1313 XA_STATE(xas, xa, (1 << 16) - 1);
1314 unsigned long i;
1315
1316 for (i = 0; i < (1 << 16); i++)
1317 XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
1318
1319 rcu_read_lock();
1320 do {
1321 void *entry = xas_prev(&xas);
1322 i--;
1323 XA_BUG_ON(xa, entry != xa_mk_index(i));
1324 XA_BUG_ON(xa, i != xas.xa_index);
1325 } while (i != 0);
1326
1327 XA_BUG_ON(xa, xas_prev(&xas) != NULL);
1328 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
1329
1330 do {
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);
1334 i++;
1335 } while (i < (1 << 16));
1336 rcu_read_unlock();
1337
1338 for (i = (1 << 8); i < (1 << 15); i++)
1339 xa_erase_index(xa, i);
1340
1341 i = xas.xa_index;
1342
1343 rcu_read_lock();
1344 do {
1345 void *entry = xas_prev(&xas);
1346 i--;
1347 if ((i < (1 << 8)) || (i >= (1 << 15)))
1348 XA_BUG_ON(xa, entry != xa_mk_index(i));
1349 else
1350 XA_BUG_ON(xa, entry != NULL);
1351 XA_BUG_ON(xa, i != xas.xa_index);
1352 } while (i != 0);
1353
1354 XA_BUG_ON(xa, xas_prev(&xas) != NULL);
1355 XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
1356
1357 do {
1358 void *entry = xas_next(&xas);
1359 if ((i < (1 << 8)) || (i >= (1 << 15)))
1360 XA_BUG_ON(xa, entry != xa_mk_index(i));
1361 else
1362 XA_BUG_ON(xa, entry != NULL);
1363 XA_BUG_ON(xa, i != xas.xa_index);
1364 i++;
1365 } while (i < (1 << 16));
1366 rcu_read_unlock();
1367
1368 xa_destroy(xa);
1369
1370 check_move_tiny(xa);
1371 check_move_max(xa);
1372
1373 for (i = 0; i < 16; i++)
1374 check_move_small(xa, 1UL << i);
1375
1376 for (i = 2; i < 16; i++)
1377 check_move_small(xa, (1UL << i) - 1);
1378 }
1379
xa_store_many_order(struct xarray * xa,unsigned long index,unsigned order)1380 static noinline void xa_store_many_order(struct xarray *xa,
1381 unsigned long index, unsigned order)
1382 {
1383 XA_STATE_ORDER(xas, xa, index, order);
1384 unsigned int i = 0;
1385
1386 do {
1387 xas_lock(&xas);
1388 XA_BUG_ON(xa, xas_find_conflict(&xas));
1389 xas_create_range(&xas);
1390 if (xas_error(&xas))
1391 goto unlock;
1392 for (i = 0; i < (1U << order); i++) {
1393 XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(index + i)));
1394 xas_next(&xas);
1395 }
1396 unlock:
1397 xas_unlock(&xas);
1398 } while (xas_nomem(&xas, GFP_KERNEL));
1399
1400 XA_BUG_ON(xa, xas_error(&xas));
1401 }
1402
check_create_range_1(struct xarray * xa,unsigned long index,unsigned order)1403 static noinline void check_create_range_1(struct xarray *xa,
1404 unsigned long index, unsigned order)
1405 {
1406 unsigned long i;
1407
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));
1412 }
1413
check_create_range_2(struct xarray * xa,unsigned order)1414 static noinline void check_create_range_2(struct xarray *xa, unsigned order)
1415 {
1416 unsigned long i;
1417 unsigned long nr = 1UL << order;
1418
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));
1424 }
1425
check_create_range_3(void)1426 static noinline void check_create_range_3(void)
1427 {
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);
1432 }
1433
check_create_range_4(struct xarray * xa,unsigned long index,unsigned order)1434 static noinline void check_create_range_4(struct xarray *xa,
1435 unsigned long index, unsigned order)
1436 {
1437 XA_STATE_ORDER(xas, xa, index, order);
1438 unsigned long base = xas.xa_index;
1439 unsigned long i = 0;
1440
1441 xa_store_index(xa, index, GFP_KERNEL);
1442 do {
1443 xas_lock(&xas);
1444 xas_create_range(&xas);
1445 if (xas_error(&xas))
1446 goto unlock;
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));
1451 else
1452 XA_BUG_ON(xa, old != NULL);
1453 xas_next(&xas);
1454 }
1455 unlock:
1456 xas_unlock(&xas);
1457 } while (xas_nomem(&xas, GFP_KERNEL));
1458
1459 XA_BUG_ON(xa, xas_error(&xas));
1460
1461 for (i = base; i < base + (1UL << order); i++)
1462 xa_erase_index(xa, i);
1463 XA_BUG_ON(xa, !xa_empty(xa));
1464 }
1465
check_create_range_5(struct xarray * xa,unsigned long index,unsigned int order)1466 static noinline void check_create_range_5(struct xarray *xa,
1467 unsigned long index, unsigned int order)
1468 {
1469 XA_STATE_ORDER(xas, xa, index, order);
1470 unsigned int i;
1471
1472 xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
1473
1474 for (i = 0; i < order + 10; i++) {
1475 do {
1476 xas_lock(&xas);
1477 xas_create_range(&xas);
1478 xas_unlock(&xas);
1479 } while (xas_nomem(&xas, GFP_KERNEL));
1480 }
1481
1482 xa_destroy(xa);
1483 }
1484
check_create_range(struct xarray * xa)1485 static noinline void check_create_range(struct xarray *xa)
1486 {
1487 unsigned int order;
1488 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 12 : 1;
1489
1490 for (order = 0; order < max_order; order++) {
1491 check_create_range_1(xa, 0, order);
1492 check_create_range_1(xa, 1U << order, order);
1493 check_create_range_1(xa, 2U << order, order);
1494 check_create_range_1(xa, 3U << order, order);
1495 check_create_range_1(xa, 1U << 24, order);
1496 if (order < 10)
1497 check_create_range_2(xa, order);
1498
1499 check_create_range_4(xa, 0, order);
1500 check_create_range_4(xa, 1U << order, order);
1501 check_create_range_4(xa, 2U << order, order);
1502 check_create_range_4(xa, 3U << order, order);
1503 check_create_range_4(xa, 1U << 24, order);
1504
1505 check_create_range_4(xa, 1, order);
1506 check_create_range_4(xa, (1U << order) + 1, order);
1507 check_create_range_4(xa, (2U << order) + 1, order);
1508 check_create_range_4(xa, (2U << order) - 1, order);
1509 check_create_range_4(xa, (3U << order) + 1, order);
1510 check_create_range_4(xa, (3U << order) - 1, order);
1511 check_create_range_4(xa, (1U << 24) + 1, order);
1512
1513 check_create_range_5(xa, 0, order);
1514 check_create_range_5(xa, (1U << order), order);
1515 }
1516
1517 check_create_range_3();
1518 }
1519
__check_store_range(struct xarray * xa,unsigned long first,unsigned long last)1520 static noinline void __check_store_range(struct xarray *xa, unsigned long first,
1521 unsigned long last)
1522 {
1523 #ifdef CONFIG_XARRAY_MULTI
1524 xa_store_range(xa, first, last, xa_mk_index(first), GFP_KERNEL);
1525
1526 XA_BUG_ON(xa, xa_load(xa, first) != xa_mk_index(first));
1527 XA_BUG_ON(xa, xa_load(xa, last) != xa_mk_index(first));
1528 XA_BUG_ON(xa, xa_load(xa, first - 1) != NULL);
1529 XA_BUG_ON(xa, xa_load(xa, last + 1) != NULL);
1530
1531 xa_store_range(xa, first, last, NULL, GFP_KERNEL);
1532 #endif
1533
1534 XA_BUG_ON(xa, !xa_empty(xa));
1535 }
1536
check_store_range(struct xarray * xa)1537 static noinline void check_store_range(struct xarray *xa)
1538 {
1539 unsigned long i, j;
1540
1541 for (i = 0; i < 128; i++) {
1542 for (j = i; j < 128; j++) {
1543 __check_store_range(xa, i, j);
1544 __check_store_range(xa, 128 + i, 128 + j);
1545 __check_store_range(xa, 4095 + i, 4095 + j);
1546 __check_store_range(xa, 4096 + i, 4096 + j);
1547 __check_store_range(xa, 123456 + i, 123456 + j);
1548 __check_store_range(xa, (1 << 24) + i, (1 << 24) + j);
1549 }
1550 }
1551 }
1552
1553 #ifdef CONFIG_XARRAY_MULTI
check_split_1(struct xarray * xa,unsigned long index,unsigned int order,unsigned int new_order)1554 static void check_split_1(struct xarray *xa, unsigned long index,
1555 unsigned int order, unsigned int new_order)
1556 {
1557 XA_STATE_ORDER(xas, xa, index, new_order);
1558 unsigned int i;
1559
1560 xa_store_order(xa, index, order, xa, GFP_KERNEL);
1561
1562 xas_split_alloc(&xas, xa, order, GFP_KERNEL);
1563 xas_lock(&xas);
1564 xas_split(&xas, xa, order);
1565 for (i = 0; i < (1 << order); i += (1 << new_order))
1566 __xa_store(xa, index + i, xa_mk_index(index + i), 0);
1567 xas_unlock(&xas);
1568
1569 for (i = 0; i < (1 << order); i++) {
1570 unsigned int val = index + (i & ~((1 << new_order) - 1));
1571 XA_BUG_ON(xa, xa_load(xa, index + i) != xa_mk_index(val));
1572 }
1573
1574 xa_set_mark(xa, index, XA_MARK_0);
1575 XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
1576
1577 xa_destroy(xa);
1578 }
1579
check_split(struct xarray * xa)1580 static noinline void check_split(struct xarray *xa)
1581 {
1582 unsigned int order, new_order;
1583
1584 XA_BUG_ON(xa, !xa_empty(xa));
1585
1586 for (order = 1; order < 2 * XA_CHUNK_SHIFT; order++) {
1587 for (new_order = 0; new_order < order; new_order++) {
1588 check_split_1(xa, 0, order, new_order);
1589 check_split_1(xa, 1UL << order, order, new_order);
1590 check_split_1(xa, 3UL << order, order, new_order);
1591 }
1592 }
1593 }
1594 #else
check_split(struct xarray * xa)1595 static void check_split(struct xarray *xa) { }
1596 #endif
1597
check_align_1(struct xarray * xa,char * name)1598 static void check_align_1(struct xarray *xa, char *name)
1599 {
1600 int i;
1601 unsigned int id;
1602 unsigned long index;
1603 void *entry;
1604
1605 for (i = 0; i < 8; i++) {
1606 XA_BUG_ON(xa, xa_alloc(xa, &id, name + i, xa_limit_32b,
1607 GFP_KERNEL) != 0);
1608 XA_BUG_ON(xa, id != i);
1609 }
1610 xa_for_each(xa, index, entry)
1611 XA_BUG_ON(xa, xa_is_err(entry));
1612 xa_destroy(xa);
1613 }
1614
1615 /*
1616 * We should always be able to store without allocating memory after
1617 * reserving a slot.
1618 */
check_align_2(struct xarray * xa,char * name)1619 static void check_align_2(struct xarray *xa, char *name)
1620 {
1621 int i;
1622
1623 XA_BUG_ON(xa, !xa_empty(xa));
1624
1625 for (i = 0; i < 8; i++) {
1626 XA_BUG_ON(xa, xa_store(xa, 0, name + i, GFP_KERNEL) != NULL);
1627 xa_erase(xa, 0);
1628 }
1629
1630 for (i = 0; i < 8; i++) {
1631 XA_BUG_ON(xa, xa_reserve(xa, 0, GFP_KERNEL) != 0);
1632 XA_BUG_ON(xa, xa_store(xa, 0, name + i, 0) != NULL);
1633 xa_erase(xa, 0);
1634 }
1635
1636 XA_BUG_ON(xa, !xa_empty(xa));
1637 }
1638
check_align(struct xarray * xa)1639 static noinline void check_align(struct xarray *xa)
1640 {
1641 char name[] = "Motorola 68000";
1642
1643 check_align_1(xa, name);
1644 check_align_1(xa, name + 1);
1645 check_align_1(xa, name + 2);
1646 check_align_1(xa, name + 3);
1647 check_align_2(xa, name);
1648 }
1649
1650 static LIST_HEAD(shadow_nodes);
1651
test_update_node(struct xa_node * node)1652 static void test_update_node(struct xa_node *node)
1653 {
1654 if (node->count && node->count == node->nr_values) {
1655 if (list_empty(&node->private_list))
1656 list_add(&shadow_nodes, &node->private_list);
1657 } else {
1658 if (!list_empty(&node->private_list))
1659 list_del_init(&node->private_list);
1660 }
1661 }
1662
shadow_remove(struct xarray * xa)1663 static noinline void shadow_remove(struct xarray *xa)
1664 {
1665 struct xa_node *node;
1666
1667 xa_lock(xa);
1668 while ((node = list_first_entry_or_null(&shadow_nodes,
1669 struct xa_node, private_list))) {
1670 XA_BUG_ON(xa, node->array != xa);
1671 list_del_init(&node->private_list);
1672 xa_delete_node(node, test_update_node);
1673 }
1674 xa_unlock(xa);
1675 }
1676
check_workingset(struct xarray * xa,unsigned long index)1677 static noinline void check_workingset(struct xarray *xa, unsigned long index)
1678 {
1679 XA_STATE(xas, xa, index);
1680 xas_set_update(&xas, test_update_node);
1681
1682 do {
1683 xas_lock(&xas);
1684 xas_store(&xas, xa_mk_value(0));
1685 xas_next(&xas);
1686 xas_store(&xas, xa_mk_value(1));
1687 xas_unlock(&xas);
1688 } while (xas_nomem(&xas, GFP_KERNEL));
1689
1690 XA_BUG_ON(xa, list_empty(&shadow_nodes));
1691
1692 xas_lock(&xas);
1693 xas_next(&xas);
1694 xas_store(&xas, &xas);
1695 XA_BUG_ON(xa, !list_empty(&shadow_nodes));
1696
1697 xas_store(&xas, xa_mk_value(2));
1698 xas_unlock(&xas);
1699 XA_BUG_ON(xa, list_empty(&shadow_nodes));
1700
1701 shadow_remove(xa);
1702 XA_BUG_ON(xa, !list_empty(&shadow_nodes));
1703 XA_BUG_ON(xa, !xa_empty(xa));
1704 }
1705
1706 /*
1707 * Check that the pointer / value / sibling entries are accounted the
1708 * way we expect them to be.
1709 */
check_account(struct xarray * xa)1710 static noinline void check_account(struct xarray *xa)
1711 {
1712 #ifdef CONFIG_XARRAY_MULTI
1713 unsigned int order;
1714
1715 for (order = 1; order < 12; order++) {
1716 XA_STATE(xas, xa, 1 << order);
1717
1718 xa_store_order(xa, 0, order, xa, GFP_KERNEL);
1719 rcu_read_lock();
1720 xas_load(&xas);
1721 XA_BUG_ON(xa, xas.xa_node->count == 0);
1722 XA_BUG_ON(xa, xas.xa_node->count > (1 << order));
1723 XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
1724 rcu_read_unlock();
1725
1726 xa_store_order(xa, 1 << order, order, xa_mk_index(1UL << order),
1727 GFP_KERNEL);
1728 XA_BUG_ON(xa, xas.xa_node->count != xas.xa_node->nr_values * 2);
1729
1730 xa_erase(xa, 1 << order);
1731 XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
1732
1733 xa_erase(xa, 0);
1734 XA_BUG_ON(xa, !xa_empty(xa));
1735 }
1736 #endif
1737 }
1738
check_get_order(struct xarray * xa)1739 static noinline void check_get_order(struct xarray *xa)
1740 {
1741 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
1742 unsigned int order;
1743 unsigned long i, j;
1744
1745 for (i = 0; i < 3; i++)
1746 XA_BUG_ON(xa, xa_get_order(xa, i) != 0);
1747
1748 for (order = 0; order < max_order; order++) {
1749 for (i = 0; i < 10; i++) {
1750 xa_store_order(xa, i << order, order,
1751 xa_mk_index(i << order), GFP_KERNEL);
1752 for (j = i << order; j < (i + 1) << order; j++)
1753 XA_BUG_ON(xa, xa_get_order(xa, j) != order);
1754 xa_erase(xa, i << order);
1755 }
1756 }
1757 }
1758
check_xas_get_order(struct xarray * xa)1759 static noinline void check_xas_get_order(struct xarray *xa)
1760 {
1761 XA_STATE(xas, xa, 0);
1762
1763 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
1764 unsigned int order;
1765 unsigned long i, j;
1766
1767 for (order = 0; order < max_order; order++) {
1768 for (i = 0; i < 10; i++) {
1769 xas_set_order(&xas, i << order, order);
1770 do {
1771 xas_lock(&xas);
1772 xas_store(&xas, xa_mk_value(i));
1773 xas_unlock(&xas);
1774 } while (xas_nomem(&xas, GFP_KERNEL));
1775
1776 for (j = i << order; j < (i + 1) << order; j++) {
1777 xas_set_order(&xas, j, 0);
1778 rcu_read_lock();
1779 xas_load(&xas);
1780 XA_BUG_ON(xa, xas_get_order(&xas) != order);
1781 rcu_read_unlock();
1782 }
1783
1784 xas_lock(&xas);
1785 xas_set_order(&xas, i << order, order);
1786 xas_store(&xas, NULL);
1787 xas_unlock(&xas);
1788 }
1789 }
1790 }
1791
check_xas_conflict_get_order(struct xarray * xa)1792 static noinline void check_xas_conflict_get_order(struct xarray *xa)
1793 {
1794 XA_STATE(xas, xa, 0);
1795
1796 void *entry;
1797 int only_once;
1798 unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
1799 unsigned int order;
1800 unsigned long i, j, k;
1801
1802 for (order = 0; order < max_order; order++) {
1803 for (i = 0; i < 10; i++) {
1804 xas_set_order(&xas, i << order, order);
1805 do {
1806 xas_lock(&xas);
1807 xas_store(&xas, xa_mk_value(i));
1808 xas_unlock(&xas);
1809 } while (xas_nomem(&xas, GFP_KERNEL));
1810
1811 /*
1812 * Ensure xas_get_order works with xas_for_each_conflict.
1813 */
1814 j = i << order;
1815 for (k = 0; k < order; k++) {
1816 only_once = 0;
1817 xas_set_order(&xas, j + (1 << k), k);
1818 xas_lock(&xas);
1819 xas_for_each_conflict(&xas, entry) {
1820 XA_BUG_ON(xa, entry != xa_mk_value(i));
1821 XA_BUG_ON(xa, xas_get_order(&xas) != order);
1822 only_once++;
1823 }
1824 XA_BUG_ON(xa, only_once != 1);
1825 xas_unlock(&xas);
1826 }
1827
1828 if (order < max_order - 1) {
1829 only_once = 0;
1830 xas_set_order(&xas, (i & ~1UL) << order, order + 1);
1831 xas_lock(&xas);
1832 xas_for_each_conflict(&xas, entry) {
1833 XA_BUG_ON(xa, entry != xa_mk_value(i));
1834 XA_BUG_ON(xa, xas_get_order(&xas) != order);
1835 only_once++;
1836 }
1837 XA_BUG_ON(xa, only_once != 1);
1838 xas_unlock(&xas);
1839 }
1840
1841 xas_set_order(&xas, i << order, order);
1842 xas_lock(&xas);
1843 xas_store(&xas, NULL);
1844 xas_unlock(&xas);
1845 }
1846 }
1847 }
1848
1849
check_destroy(struct xarray * xa)1850 static noinline void check_destroy(struct xarray *xa)
1851 {
1852 unsigned long index;
1853
1854 XA_BUG_ON(xa, !xa_empty(xa));
1855
1856 /* Destroying an empty array is a no-op */
1857 xa_destroy(xa);
1858 XA_BUG_ON(xa, !xa_empty(xa));
1859
1860 /* Destroying an array with a single entry */
1861 for (index = 0; index < 1000; index++) {
1862 xa_store_index(xa, index, GFP_KERNEL);
1863 XA_BUG_ON(xa, xa_empty(xa));
1864 xa_destroy(xa);
1865 XA_BUG_ON(xa, !xa_empty(xa));
1866 }
1867
1868 /* Destroying an array with a single entry at ULONG_MAX */
1869 xa_store(xa, ULONG_MAX, xa, GFP_KERNEL);
1870 XA_BUG_ON(xa, xa_empty(xa));
1871 xa_destroy(xa);
1872 XA_BUG_ON(xa, !xa_empty(xa));
1873
1874 #ifdef CONFIG_XARRAY_MULTI
1875 /* Destroying an array with a multi-index entry */
1876 xa_store_order(xa, 1 << 11, 11, xa, GFP_KERNEL);
1877 XA_BUG_ON(xa, xa_empty(xa));
1878 xa_destroy(xa);
1879 XA_BUG_ON(xa, !xa_empty(xa));
1880 #endif
1881 }
1882
1883 static DEFINE_XARRAY(array);
1884
xarray_checks(void)1885 static int xarray_checks(void)
1886 {
1887 check_xa_err(&array);
1888 check_xas_retry(&array);
1889 check_xa_load(&array);
1890 check_xa_mark(&array);
1891 check_xa_shrink(&array);
1892 check_xas_erase(&array);
1893 check_insert(&array);
1894 check_cmpxchg(&array);
1895 check_reserve(&array);
1896 check_reserve(&xa0);
1897 check_multi_store(&array);
1898 check_get_order(&array);
1899 check_xas_get_order(&array);
1900 check_xas_conflict_get_order(&array);
1901 check_xa_alloc();
1902 check_find(&array);
1903 check_find_entry(&array);
1904 check_pause(&array);
1905 check_account(&array);
1906 check_destroy(&array);
1907 check_move(&array);
1908 check_create_range(&array);
1909 check_store_range(&array);
1910 check_store_iter(&array);
1911 check_align(&xa0);
1912 check_split(&array);
1913
1914 check_workingset(&array, 0);
1915 check_workingset(&array, 64);
1916 check_workingset(&array, 4096);
1917
1918 printk("XArray: %u of %u tests passed\n", tests_passed, tests_run);
1919 return (tests_run == tests_passed) ? 0 : -EINVAL;
1920 }
1921
xarray_exit(void)1922 static void xarray_exit(void)
1923 {
1924 }
1925
1926 module_init(xarray_checks);
1927 module_exit(xarray_exit);
1928 MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
1929 MODULE_LICENSE("GPL");
1930