tools/testing/radix-tree/idr-test.c

   1 /*
   2  * idr-test.c: Test the IDR API
   3  * Copyright (c) 2016 Matthew Wilcox <willy@infradead.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14 #include <linux/bitmap.h>
  15 #include <linux/idr.h>
  16 #include <linux/slab.h>
  17 #include <linux/kernel.h>
  18 #include <linux/errno.h>
  19
  20 #include "test.h"
  21
  22 #define DUMMY_PTR       ((void *)0x12)
  23
  24 int item_idr_free(int id, void *p, void *data)
  25 {
  26         struct item *item = p;
  27         assert(item->index == id);
  28         free(p);
  29
  30         return 0;
  31 }
  32
  33 void item_idr_remove(struct idr *idr, int id)
  34 {
  35         struct item *item = idr_find(idr, id);
  36         assert(item->index == id);
  37         idr_remove(idr, id);
  38         free(item);
  39 }
  40
  41 void idr_alloc_test(void)
  42 {
  43         unsigned long i;
  44         DEFINE_IDR(idr);
  45
  46         assert(idr_alloc_cyclic(&idr, DUMMY_PTR, 0, 0x4000, GFP_KERNEL) == 0);
  47         assert(idr_alloc_cyclic(&idr, DUMMY_PTR, 0x3ffd, 0x4000, GFP_KERNEL) == 0x3ffd);
  48         idr_remove(&idr, 0x3ffd);
  49         idr_remove(&idr, 0);
  50
  51         for (i = 0x3ffe; i < 0x4003; i++) {
  52                 int id;
  53                 struct item *item;
  54
  55                 if (i < 0x4000)
  56                         item = item_create(i, 0);
  57                 else
  58                         item = item_create(i - 0x3fff, 0);
  59
  60                 id = idr_alloc_cyclic(&idr, item, 1, 0x4000, GFP_KERNEL);
  61                 assert(id == item->index);
  62         }
  63
  64         idr_for_each(&idr, item_idr_free, &idr);
  65         idr_destroy(&idr);
  66 }
  67
  68 void idr_replace_test(void)
  69 {
  70         DEFINE_IDR(idr);
  71
  72         idr_alloc(&idr, (void *)-1, 10, 11, GFP_KERNEL);
  73         idr_replace(&idr, &idr, 10);
  74
  75         idr_destroy(&idr);
  76 }
  77
  78 /*
  79  * Unlike the radix tree, you can put a NULL pointer -- with care -- into
  80  * the IDR.  Some interfaces, like idr_find() do not distinguish between
  81  * "present, value is NULL" and "not present", but that's exactly what some
  82  * users want.
  83  */
  84 void idr_null_test(void)
  85 {
  86         int i;
  87         DEFINE_IDR(idr);
  88
  89         assert(idr_is_empty(&idr));
  90
  91         assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 0);
  92         assert(!idr_is_empty(&idr));
  93         idr_remove(&idr, 0);
  94         assert(idr_is_empty(&idr));
  95
  96         assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 0);
  97         assert(!idr_is_empty(&idr));
  98         idr_destroy(&idr);
  99         assert(idr_is_empty(&idr));
 100
 101         for (i = 0; i < 10; i++) {
 102                 assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == i);
 103         }
 104
 105         assert(idr_replace(&idr, DUMMY_PTR, 3) == NULL);
 106         assert(idr_replace(&idr, DUMMY_PTR, 4) == NULL);
 107         assert(idr_replace(&idr, NULL, 4) == DUMMY_PTR);
 108         assert(idr_replace(&idr, DUMMY_PTR, 11) == ERR_PTR(-ENOENT));
 109         idr_remove(&idr, 5);
 110         assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 5);
 111         idr_remove(&idr, 5);
 112
 113         for (i = 0; i < 9; i++) {
 114                 idr_remove(&idr, i);
 115                 assert(!idr_is_empty(&idr));
 116         }
 117         idr_remove(&idr, 8);
 118         assert(!idr_is_empty(&idr));
 119         idr_remove(&idr, 9);
 120         assert(idr_is_empty(&idr));
 121
 122         assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 0);
 123         assert(idr_replace(&idr, DUMMY_PTR, 3) == ERR_PTR(-ENOENT));
 124         assert(idr_replace(&idr, DUMMY_PTR, 0) == NULL);
 125         assert(idr_replace(&idr, NULL, 0) == DUMMY_PTR);
 126
 127         idr_destroy(&idr);
 128         assert(idr_is_empty(&idr));
 129
 130         for (i = 1; i < 10; i++) {
 131                 assert(idr_alloc(&idr, NULL, 1, 0, GFP_KERNEL) == i);
 132         }
 133
 134         idr_destroy(&idr);
 135         assert(idr_is_empty(&idr));
 136 }
 137
 138 void idr_nowait_test(void)
 139 {
 140         unsigned int i;
 141         DEFINE_IDR(idr);
 142
 143         idr_preload(GFP_KERNEL);
 144
 145         for (i = 0; i < 3; i++) {
 146                 struct item *item = item_create(i, 0);
 147                 assert(idr_alloc(&idr, item, i, i + 1, GFP_NOWAIT) == i);
 148         }
 149
 150         idr_preload_end();
 151
 152         idr_for_each(&idr, item_idr_free, &idr);
 153         idr_destroy(&idr);
 154 }
 155
 156 void idr_get_next_test(int base)
 157 {
 158         unsigned long i;
 159         int nextid;
 160         DEFINE_IDR(idr);
 161         idr_init_base(&idr, base);
 162
 163         int indices[] = {4, 7, 9, 15, 65, 128, 1000, 99999, 0};
 164
 165         for(i = 0; indices[i]; i++) {
 166                 struct item *item = item_create(indices[i], 0);
 167                 assert(idr_alloc(&idr, item, indices[i], indices[i+1],
 168                                  GFP_KERNEL) == indices[i]);
 169         }
 170
 171         for(i = 0, nextid = 0; indices[i]; i++) {
 172                 idr_get_next(&idr, &nextid);
 173                 assert(nextid == indices[i]);
 174                 nextid++;
 175         }
 176
 177         idr_for_each(&idr, item_idr_free, &idr);
 178         idr_destroy(&idr);
 179 }
 180
 181 int idr_u32_cb(int id, void *ptr, void *data)
 182 {
 183         BUG_ON(id < 0);
 184         BUG_ON(ptr != DUMMY_PTR);
 185         return 0;
 186 }
 187
 188 void idr_u32_test1(struct idr *idr, u32 handle)
 189 {
 190         static bool warned = false;
 191         u32 id = handle;
 192         int sid = 0;
 193         void *ptr;
 194
 195         BUG_ON(idr_alloc_u32(idr, DUMMY_PTR, &id, id, GFP_KERNEL));
 196         BUG_ON(id != handle);
 197         BUG_ON(idr_alloc_u32(idr, DUMMY_PTR, &id, id, GFP_KERNEL) != -ENOSPC);
 198         BUG_ON(id != handle);
 199         if (!warned && id > INT_MAX)
 200                 printk("vvv Ignore these warnings\n");
 201         ptr = idr_get_next(idr, &sid);
 202         if (id > INT_MAX) {
 203                 BUG_ON(ptr != NULL);
 204                 BUG_ON(sid != 0);
 205         } else {
 206                 BUG_ON(ptr != DUMMY_PTR);
 207                 BUG_ON(sid != id);
 208         }
 209         idr_for_each(idr, idr_u32_cb, NULL);
 210         if (!warned && id > INT_MAX) {
 211                 printk("^^^ Warnings over\n");
 212                 warned = true;
 213         }
 214         BUG_ON(idr_remove(idr, id) != DUMMY_PTR);
 215         BUG_ON(!idr_is_empty(idr));
 216 }
 217
 218 void idr_u32_test(int base)
 219 {
 220         DEFINE_IDR(idr);
 221         idr_init_base(&idr, base);
 222         idr_u32_test1(&idr, 10);
 223         idr_u32_test1(&idr, 0x7fffffff);
 224         idr_u32_test1(&idr, 0x80000000);
 225         idr_u32_test1(&idr, 0x80000001);
 226         idr_u32_test1(&idr, 0xffe00000);
 227         idr_u32_test1(&idr, 0xffffffff);
 228 }
 229
 230 static inline void *idr_mk_value(unsigned long v)
 231 {
 232         BUG_ON((long)v < 0);
 233         return (void *)((v & 1) | 2 | (v << 1));
 234 }
 235
 236 DEFINE_IDR(find_idr);
 237
 238 static void *idr_throbber(void *arg)
 239 {
 240         time_t start = time(NULL);
 241         int id = *(int *)arg;
 242
 243         rcu_register_thread();
 244         do {
 245                 idr_alloc(&find_idr, idr_mk_value(id), id, id + 1, GFP_KERNEL);
 246                 idr_remove(&find_idr, id);
 247         } while (time(NULL) < start + 10);
 248         rcu_unregister_thread();
 249
 250         return NULL;
 251 }
 252
 253 void idr_find_test_1(int anchor_id, int throbber_id)
 254 {
 255         pthread_t throbber;
 256         time_t start = time(NULL);
 257
 258         pthread_create(&throbber, NULL, idr_throbber, &throbber_id);
 259
 260         BUG_ON(idr_alloc(&find_idr, idr_mk_value(anchor_id), anchor_id,
 261                                 anchor_id + 1, GFP_KERNEL) != anchor_id);
 262
 263         do {
 264                 int id = 0;
 265                 void *entry = idr_get_next(&find_idr, &id);
 266                 BUG_ON(entry != idr_mk_value(id));
 267         } while (time(NULL) < start + 11);
 268
 269         pthread_join(throbber, NULL);
 270
 271         idr_remove(&find_idr, anchor_id);
 272         BUG_ON(!idr_is_empty(&find_idr));
 273 }
 274
 275 void idr_find_test(void)
 276 {
 277         idr_find_test_1(100000, 0);
 278         idr_find_test_1(0, 100000);
 279 }
 280
 281 void idr_checks(void)
 282 {
 283         unsigned long i;
 284         DEFINE_IDR(idr);
 285
 286         for (i = 0; i < 10000; i++) {
 287                 struct item *item = item_create(i, 0);
 288                 assert(idr_alloc(&idr, item, 0, 20000, GFP_KERNEL) == i);
 289         }
 290
 291         assert(idr_alloc(&idr, DUMMY_PTR, 5, 30, GFP_KERNEL) < 0);
 292
 293         for (i = 0; i < 5000; i++)
 294                 item_idr_remove(&idr, i);
 295
 296         idr_remove(&idr, 3);
 297
 298         idr_for_each(&idr, item_idr_free, &idr);
 299         idr_destroy(&idr);
 300
 301         assert(idr_is_empty(&idr));
 302
 303         idr_remove(&idr, 3);
 304         idr_remove(&idr, 0);
 305
 306         assert(idr_alloc(&idr, DUMMY_PTR, 0, 0, GFP_KERNEL) == 0);
 307         idr_remove(&idr, 1);
 308         for (i = 1; i < RADIX_TREE_MAP_SIZE; i++)
 309                 assert(idr_alloc(&idr, DUMMY_PTR, 0, 0, GFP_KERNEL) == i);
 310         idr_remove(&idr, 1 << 30);
 311         idr_destroy(&idr);
 312
 313         for (i = INT_MAX - 3UL; i < INT_MAX + 1UL; i++) {
 314                 struct item *item = item_create(i, 0);
 315                 assert(idr_alloc(&idr, item, i, i + 10, GFP_KERNEL) == i);
 316         }
 317         assert(idr_alloc(&idr, DUMMY_PTR, i - 2, i, GFP_KERNEL) == -ENOSPC);
 318         assert(idr_alloc(&idr, DUMMY_PTR, i - 2, i + 10, GFP_KERNEL) == -ENOSPC);
 319
 320         idr_for_each(&idr, item_idr_free, &idr);
 321         idr_destroy(&idr);
 322         idr_destroy(&idr);
 323
 324         assert(idr_is_empty(&idr));
 325
 326         idr_set_cursor(&idr, INT_MAX - 3UL);
 327         for (i = INT_MAX - 3UL; i < INT_MAX + 3UL; i++) {
 328                 struct item *item;
 329                 unsigned int id;
 330                 if (i <= INT_MAX)
 331                         item = item_create(i, 0);
 332                 else
 333                         item = item_create(i - INT_MAX - 1, 0);
 334
 335                 id = idr_alloc_cyclic(&idr, item, 0, 0, GFP_KERNEL);
 336                 assert(id == item->index);
 337         }
 338
 339         idr_for_each(&idr, item_idr_free, &idr);
 340         idr_destroy(&idr);
 341         assert(idr_is_empty(&idr));
 342
 343         for (i = 1; i < 10000; i++) {
 344                 struct item *item = item_create(i, 0);
 345                 assert(idr_alloc(&idr, item, 1, 20000, GFP_KERNEL) == i);
 346         }
 347
 348         idr_for_each(&idr, item_idr_free, &idr);
 349         idr_destroy(&idr);
 350
 351         idr_replace_test();
 352         idr_alloc_test();
 353         idr_null_test();
 354         idr_nowait_test();
 355         idr_get_next_test(0);
 356         idr_get_next_test(1);
 357         idr_get_next_test(4);
 358         idr_u32_test(4);
 359         idr_u32_test(1);
 360         idr_u32_test(0);
 361         idr_find_test();
 362 }
 363
 364 #define module_init(x)
 365 #define module_exit(x)
 366 #define MODULE_AUTHOR(x)
 367 #define MODULE_LICENSE(x)
 368 #define dump_stack()    assert(0)
 369 void ida_dump(struct ida *);
 370
 371 #include "../../../lib/test_ida.c"
 372
 373 /*
 374  * Check that we get the correct error when we run out of memory doing
 375  * allocations.  In userspace, GFP_NOWAIT will always fail an allocation.
 376  * The first test is for not having a bitmap available, and the second test
 377  * is for not being able to allocate a level of the radix tree.
 378  */
 379 void ida_check_nomem(void)
 380 {
 381         DEFINE_IDA(ida);
 382         int id;
 383
 384         id = ida_alloc_min(&ida, 256, GFP_NOWAIT);
 385         IDA_BUG_ON(&ida, id != -ENOMEM);
 386         id = ida_alloc_min(&ida, 1UL << 30, GFP_NOWAIT);
 387         IDA_BUG_ON(&ida, id != -ENOMEM);
 388         IDA_BUG_ON(&ida, !ida_is_empty(&ida));
 389 }
 390
 391 /*
 392  * Check handling of conversions between exceptional entries and full bitmaps.
 393  */
 394 void ida_check_conv_user(void)
 395 {
 396         DEFINE_IDA(ida);
 397         unsigned long i;
 398
 399         radix_tree_cpu_dead(1);
 400         for (i = 0; i < 1000000; i++) {
 401                 int id = ida_alloc(&ida, GFP_NOWAIT);
 402                 if (id == -ENOMEM) {
 403                         IDA_BUG_ON(&ida, (i % IDA_BITMAP_BITS) !=
 404                                         BITS_PER_LONG - 2);
 405                         id = ida_alloc(&ida, GFP_KERNEL);
 406                 } else {
 407                         IDA_BUG_ON(&ida, (i % IDA_BITMAP_BITS) ==
 408                                         BITS_PER_LONG - 2);
 409                 }
 410                 IDA_BUG_ON(&ida, id != i);
 411         }
 412         ida_destroy(&ida);
 413 }
 414
 415 void ida_check_random(void)
 416 {
 417         DEFINE_IDA(ida);
 418         DECLARE_BITMAP(bitmap, 2048);
 419         unsigned int i;
 420         time_t s = time(NULL);
 421
 422  repeat:
 423         memset(bitmap, 0, sizeof(bitmap));
 424         for (i = 0; i < 100000; i++) {
 425                 int i = rand();
 426                 int bit = i & 2047;
 427                 if (test_bit(bit, bitmap)) {
 428                         __clear_bit(bit, bitmap);
 429                         ida_free(&ida, bit);
 430                 } else {
 431                         __set_bit(bit, bitmap);
 432                         IDA_BUG_ON(&ida, ida_alloc_min(&ida, bit, GFP_KERNEL)
 433                                         != bit);
 434                 }
 435         }
 436         ida_destroy(&ida);
 437         if (time(NULL) < s + 10)
 438                 goto repeat;
 439 }
 440
 441 void ida_simple_get_remove_test(void)
 442 {
 443         DEFINE_IDA(ida);
 444         unsigned long i;
 445
 446         for (i = 0; i < 10000; i++) {
 447                 assert(ida_simple_get(&ida, 0, 20000, GFP_KERNEL) == i);
 448         }
 449         assert(ida_simple_get(&ida, 5, 30, GFP_KERNEL) < 0);
 450
 451         for (i = 0; i < 10000; i++) {
 452                 ida_simple_remove(&ida, i);
 453         }
 454         assert(ida_is_empty(&ida));
 455
 456         ida_destroy(&ida);
 457 }
 458
 459 void user_ida_checks(void)
 460 {
 461         radix_tree_cpu_dead(1);
 462
 463         ida_check_nomem();
 464         ida_check_conv_user();
 465         ida_check_random();
 466         ida_simple_get_remove_test();
 467
 468         radix_tree_cpu_dead(1);
 469 }
 470
 471 static void *ida_random_fn(void *arg)
 472 {
 473         rcu_register_thread();
 474         ida_check_random();
 475         rcu_unregister_thread();
 476         return NULL;
 477 }
 478
 479 void ida_thread_tests(void)
 480 {
 481         pthread_t threads[20];
 482         int i;
 483
 484         for (i = 0; i < ARRAY_SIZE(threads); i++)
 485                 if (pthread_create(&threads[i], NULL, ida_random_fn, NULL)) {
 486                         perror("creating ida thread");
 487                         exit(1);
 488                 }
 489
 490         while (i--)
 491                 pthread_join(threads[i], NULL);
 492 }
 493
 494 void ida_tests(void)
 495 {
 496         user_ida_checks();
 497         ida_checks();
 498         ida_exit();
 499         ida_thread_tests();
 500 }
 501
 502 int __weak main(void)
 503 {
 504         radix_tree_init();
 505         idr_checks();
 506         ida_tests();
 507         radix_tree_cpu_dead(1);
 508         rcu_barrier();
 509         if (nr_allocated)
 510                 printf("nr_allocated = %d\n", nr_allocated);
 511         return 0;
 512 }