drivers/gpu/drm/tests/drm_mm_test.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Test cases for the drm_mm range manager
   4  *
   5  * Copyright (c) 2022 Arthur Grillo <arthur.grillo@usp.br>
   6  */
   7
   8 #include <kunit/test.h>
   9
  10 #include <linux/prime_numbers.h>
  11 #include <linux/slab.h>
  12 #include <linux/random.h>
  13 #include <linux/vmalloc.h>
  14 #include <linux/ktime.h>
  15
  16 #include <drm/drm_mm.h>
  17
  18 #include "../lib/drm_random.h"
  19
  20 static unsigned int random_seed;
  21 static unsigned int max_iterations = 8192;
  22 static unsigned int max_prime = 128;
  23
  24 enum {
  25         BEST,
  26         BOTTOMUP,
  27         TOPDOWN,
  28         EVICT,
  29 };
  30
  31 static const struct insert_mode {
  32         const char *name;
  33         enum drm_mm_insert_mode mode;
  34 } insert_modes[] = {
  35         [BEST] = { "best", DRM_MM_INSERT_BEST },
  36         [BOTTOMUP] = { "bottom-up", DRM_MM_INSERT_LOW },
  37         [TOPDOWN] = { "top-down", DRM_MM_INSERT_HIGH },
  38         [EVICT] = { "evict", DRM_MM_INSERT_EVICT },
  39         {}
  40 }, evict_modes[] = {
  41         { "bottom-up", DRM_MM_INSERT_LOW },
  42         { "top-down", DRM_MM_INSERT_HIGH },
  43         {}
  44 };
  45
  46 static bool assert_no_holes(struct kunit *test, const struct drm_mm *mm)
  47 {
  48         struct drm_mm_node *hole;
  49         u64 hole_start, __always_unused hole_end;
  50         unsigned long count;
  51
  52         count = 0;
  53         drm_mm_for_each_hole(hole, mm, hole_start, hole_end)
  54                 count++;
  55         if (count) {
  56                 KUNIT_FAIL(test,
  57                            "Expected to find no holes (after reserve), found %lu instead\n", count);
  58                 return false;
  59         }
  60
  61         drm_mm_for_each_node(hole, mm) {
  62                 if (drm_mm_hole_follows(hole)) {
  63                         KUNIT_FAIL(test, "Hole follows node, expected none!\n");
  64                         return false;
  65                 }
  66         }
  67
  68         return true;
  69 }
  70
  71 static bool assert_one_hole(struct kunit *test, const struct drm_mm *mm, u64 start, u64 end)
  72 {
  73         struct drm_mm_node *hole;
  74         u64 hole_start, hole_end;
  75         unsigned long count;
  76         bool ok = true;
  77
  78         if (end <= start)
  79                 return true;
  80
  81         count = 0;
  82         drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
  83                 if (start != hole_start || end != hole_end) {
  84                         if (ok)
  85                                 KUNIT_FAIL(test,
  86                                            "empty mm has incorrect hole, found (%llx, %llx), expect (%llx, %llx)\n",
  87                                            hole_start, hole_end, start, end);
  88                         ok = false;
  89                 }
  90                 count++;
  91         }
  92         if (count != 1) {
  93                 KUNIT_FAIL(test, "Expected to find one hole, found %lu instead\n", count);
  94                 ok = false;
  95         }
  96
  97         return ok;
  98 }
  99
 100 static bool assert_continuous(struct kunit *test, const struct drm_mm *mm, u64 size)
 101 {
 102         struct drm_mm_node *node, *check, *found;
 103         unsigned long n;
 104         u64 addr;
 105
 106         if (!assert_no_holes(test, mm))
 107                 return false;
 108
 109         n = 0;
 110         addr = 0;
 111         drm_mm_for_each_node(node, mm) {
 112                 if (node->start != addr) {
 113                         KUNIT_FAIL(test, "node[%ld] list out of order, expected %llx found %llx\n",
 114                                    n, addr, node->start);
 115                         return false;
 116                 }
 117
 118                 if (node->size != size) {
 119                         KUNIT_FAIL(test, "node[%ld].size incorrect, expected %llx, found %llx\n",
 120                                    n, size, node->size);
 121                         return false;
 122                 }
 123
 124                 if (drm_mm_hole_follows(node)) {
 125                         KUNIT_FAIL(test, "node[%ld] is followed by a hole!\n", n);
 126                         return false;
 127                 }
 128
 129                 found = NULL;
 130                 drm_mm_for_each_node_in_range(check, mm, addr, addr + size) {
 131                         if (node != check) {
 132                                 KUNIT_FAIL(test,
 133                                            "lookup return wrong node, expected start %llx, found %llx\n",
 134                                            node->start, check->start);
 135                                 return false;
 136                         }
 137                         found = check;
 138                 }
 139                 if (!found) {
 140                         KUNIT_FAIL(test, "lookup failed for node %llx + %llx\n", addr, size);
 141                         return false;
 142                 }
 143
 144                 addr += size;
 145                 n++;
 146         }
 147
 148         return true;
 149 }
 150
 151 static u64 misalignment(struct drm_mm_node *node, u64 alignment)
 152 {
 153         u64 rem;
 154
 155         if (!alignment)
 156                 return 0;
 157
 158         div64_u64_rem(node->start, alignment, &rem);
 159         return rem;
 160 }
 161
 162 static bool assert_node(struct kunit *test, struct drm_mm_node *node, struct drm_mm *mm,
 163                         u64 size, u64 alignment, unsigned long color)
 164 {
 165         bool ok = true;
 166
 167         if (!drm_mm_node_allocated(node) || node->mm != mm) {
 168                 KUNIT_FAIL(test, "node not allocated\n");
 169                 ok = false;
 170         }
 171
 172         if (node->size != size) {
 173                 KUNIT_FAIL(test, "node has wrong size, found %llu, expected %llu\n",
 174                            node->size, size);
 175                 ok = false;
 176         }
 177
 178         if (misalignment(node, alignment)) {
 179                 KUNIT_FAIL(test,
 180                            "node is misaligned, start %llx rem %llu, expected alignment %llu\n",
 181                            node->start, misalignment(node, alignment), alignment);
 182                 ok = false;
 183         }
 184
 185         if (node->color != color) {
 186                 KUNIT_FAIL(test, "node has wrong color, found %lu, expected %lu\n",
 187                            node->color, color);
 188                 ok = false;
 189         }
 190
 191         return ok;
 192 }
 193
 194 static void drm_test_mm_init(struct kunit *test)
 195 {
 196         const unsigned int size = 4096;
 197         struct drm_mm mm;
 198         struct drm_mm_node tmp;
 199
 200         /* Start with some simple checks on initialising the struct drm_mm */
 201         memset(&mm, 0, sizeof(mm));
 202         KUNIT_ASSERT_FALSE_MSG(test, drm_mm_initialized(&mm),
 203                                "zeroed mm claims to be initialized\n");
 204
 205         memset(&mm, 0xff, sizeof(mm));
 206         drm_mm_init(&mm, 0, size);
 207         if (!drm_mm_initialized(&mm)) {
 208                 KUNIT_FAIL(test, "mm claims not to be initialized\n");
 209                 goto out;
 210         }
 211
 212         if (!drm_mm_clean(&mm)) {
 213                 KUNIT_FAIL(test, "mm not empty on creation\n");
 214                 goto out;
 215         }
 216
 217         /* After creation, it should all be one massive hole */
 218         if (!assert_one_hole(test, &mm, 0, size)) {
 219                 KUNIT_FAIL(test, "");
 220                 goto out;
 221         }
 222
 223         memset(&tmp, 0, sizeof(tmp));
 224         tmp.start = 0;
 225         tmp.size = size;
 226         if (drm_mm_reserve_node(&mm, &tmp)) {
 227                 KUNIT_FAIL(test, "failed to reserve whole drm_mm\n");
 228                 goto out;
 229         }
 230
 231         /* After filling the range entirely, there should be no holes */
 232         if (!assert_no_holes(test, &mm)) {
 233                 KUNIT_FAIL(test, "");
 234                 goto out;
 235         }
 236
 237         /* And then after emptying it again, the massive hole should be back */
 238         drm_mm_remove_node(&tmp);
 239         if (!assert_one_hole(test, &mm, 0, size)) {
 240                 KUNIT_FAIL(test, "");
 241                 goto out;
 242         }
 243
 244 out:
 245         drm_mm_takedown(&mm);
 246 }
 247
 248 static void drm_test_mm_debug(struct kunit *test)
 249 {
 250         struct drm_mm mm;
 251         struct drm_mm_node nodes[2];
 252
 253         /* Create a small drm_mm with a couple of nodes and a few holes, and
 254          * check that the debug iterator doesn't explode over a trivial drm_mm.
 255          */
 256
 257         drm_mm_init(&mm, 0, 4096);
 258
 259         memset(nodes, 0, sizeof(nodes));
 260         nodes[0].start = 512;
 261         nodes[0].size = 1024;
 262         KUNIT_ASSERT_FALSE_MSG(test, drm_mm_reserve_node(&mm, &nodes[0]),
 263                                "failed to reserve node[0] {start=%lld, size=%lld)\n",
 264                                nodes[0].start, nodes[0].size);
 265
 266         nodes[1].size = 1024;
 267         nodes[1].start = 4096 - 512 - nodes[1].size;
 268         KUNIT_ASSERT_FALSE_MSG(test, drm_mm_reserve_node(&mm, &nodes[1]),
 269                                "failed to reserve node[0] {start=%lld, size=%lld)\n",
 270                                nodes[0].start, nodes[0].size);
 271 }
 272
 273 static struct drm_mm_node *set_node(struct drm_mm_node *node,
 274                                     u64 start, u64 size)
 275 {
 276         node->start = start;
 277         node->size = size;
 278         return node;
 279 }
 280
 281 static bool expect_reserve_fail(struct kunit *test, struct drm_mm *mm, struct drm_mm_node *node)
 282 {
 283         int err;
 284
 285         err = drm_mm_reserve_node(mm, node);
 286         if (likely(err == -ENOSPC))
 287                 return true;
 288
 289         if (!err) {
 290                 KUNIT_FAIL(test, "impossible reserve succeeded, node %llu + %llu\n",
 291                            node->start, node->size);
 292                 drm_mm_remove_node(node);
 293         } else {
 294                 KUNIT_FAIL(test,
 295                            "impossible reserve failed with wrong error %d [expected %d], node %llu + %llu\n",
 296                        err, -ENOSPC, node->start, node->size);
 297         }
 298         return false;
 299 }
 300
 301 static bool noinline_for_stack check_reserve_boundaries(struct kunit *test, struct drm_mm *mm,
 302                                                         unsigned int count,
 303                                                         u64 size)
 304 {
 305         const struct boundary {
 306                 u64 start, size;
 307                 const char *name;
 308         } boundaries[] = {
 309 #define B(st, sz) { (st), (sz), "{ " #st ", " #sz "}" }
 310                 B(0, 0),
 311                 B(-size, 0),
 312                 B(size, 0),
 313                 B(size * count, 0),
 314                 B(-size, size),
 315                 B(-size, -size),
 316                 B(-size, 2 * size),
 317                 B(0, -size),
 318                 B(size, -size),
 319                 B(count * size, size),
 320                 B(count * size, -size),
 321                 B(count * size, count * size),
 322                 B(count * size, -count * size),
 323                 B(count * size, -(count + 1) * size),
 324                 B((count + 1) * size, size),
 325                 B((count + 1) * size, -size),
 326                 B((count + 1) * size, -2 * size),
 327 #undef B
 328         };
 329         struct drm_mm_node tmp = {};
 330         int n;
 331
 332         for (n = 0; n < ARRAY_SIZE(boundaries); n++) {
 333                 if (!expect_reserve_fail(test, mm, set_node(&tmp, boundaries[n].start,
 334                                                             boundaries[n].size))) {
 335                         KUNIT_FAIL(test, "boundary[%d:%s] failed, count=%u, size=%lld\n",
 336                                    n, boundaries[n].name, count, size);
 337                         return false;
 338                 }
 339         }
 340
 341         return true;
 342 }
 343
 344 static int __drm_test_mm_reserve(struct kunit *test, unsigned int count, u64 size)
 345 {
 346         DRM_RND_STATE(prng, random_seed);
 347         struct drm_mm mm;
 348         struct drm_mm_node tmp, *nodes, *node, *next;
 349         unsigned int *order, n, m, o = 0;
 350         int ret, err;
 351
 352         /* For exercising drm_mm_reserve_node(), we want to check that
 353          * reservations outside of the drm_mm range are rejected, and to
 354          * overlapping and otherwise already occupied ranges. Afterwards,
 355          * the tree and nodes should be intact.
 356          */
 357
 358         DRM_MM_BUG_ON(!count);
 359         DRM_MM_BUG_ON(!size);
 360
 361         ret = -ENOMEM;
 362         order = drm_random_order(count, &prng);
 363         if (!order)
 364                 goto err;
 365
 366         nodes = vzalloc(array_size(count, sizeof(*nodes)));
 367         KUNIT_ASSERT_TRUE(test, nodes);
 368
 369         ret = -EINVAL;
 370         drm_mm_init(&mm, 0, count * size);
 371
 372         if (!check_reserve_boundaries(test, &mm, count, size))
 373                 goto out;
 374
 375         for (n = 0; n < count; n++) {
 376                 nodes[n].start = order[n] * size;
 377                 nodes[n].size = size;
 378
 379                 err = drm_mm_reserve_node(&mm, &nodes[n]);
 380                 if (err) {
 381                         KUNIT_FAIL(test, "reserve failed, step %d, start %llu\n",
 382                                    n, nodes[n].start);
 383                         ret = err;
 384                         goto out;
 385                 }
 386
 387                 if (!drm_mm_node_allocated(&nodes[n])) {
 388                         KUNIT_FAIL(test, "reserved node not allocated! step %d, start %llu\n",
 389                                    n, nodes[n].start);
 390                         goto out;
 391                 }
 392
 393                 if (!expect_reserve_fail(test, &mm, &nodes[n]))
 394                         goto out;
 395         }
 396
 397         /* After random insertion the nodes should be in order */
 398         if (!assert_continuous(test, &mm, size))
 399                 goto out;
 400
 401         /* Repeated use should then fail */
 402         drm_random_reorder(order, count, &prng);
 403         for (n = 0; n < count; n++) {
 404                 if (!expect_reserve_fail(test, &mm, set_node(&tmp, order[n] * size, 1)))
 405                         goto out;
 406
 407                 /* Remove and reinsert should work */
 408                 drm_mm_remove_node(&nodes[order[n]]);
 409                 err = drm_mm_reserve_node(&mm, &nodes[order[n]]);
 410                 if (err) {
 411                         KUNIT_FAIL(test, "reserve failed, step %d, start %llu\n",
 412                                    n, nodes[n].start);
 413                         ret = err;
 414                         goto out;
 415                 }
 416         }
 417
 418         if (!assert_continuous(test, &mm, size))
 419                 goto out;
 420
 421         /* Overlapping use should then fail */
 422         for (n = 0; n < count; n++) {
 423                 if (!expect_reserve_fail(test, &mm, set_node(&tmp, 0, size * count)))
 424                         goto out;
 425         }
 426         for (n = 0; n < count; n++) {
 427                 if (!expect_reserve_fail(test, &mm, set_node(&tmp, size * n, size * (count - n))))
 428                         goto out;
 429         }
 430
 431         /* Remove several, reinsert, check full */
 432         for_each_prime_number(n, min(max_prime, count)) {
 433                 for (m = 0; m < n; m++) {
 434                         node = &nodes[order[(o + m) % count]];
 435                         drm_mm_remove_node(node);
 436                 }
 437
 438                 for (m = 0; m < n; m++) {
 439                         node = &nodes[order[(o + m) % count]];
 440                         err = drm_mm_reserve_node(&mm, node);
 441                         if (err) {
 442                                 KUNIT_FAIL(test, "reserve failed, step %d/%d, start %llu\n",
 443                                            m, n, node->start);
 444                                 ret = err;
 445                                 goto out;
 446                         }
 447                 }
 448
 449                 o += n;
 450
 451                 if (!assert_continuous(test, &mm, size))
 452                         goto out;
 453         }
 454
 455         ret = 0;
 456 out:
 457         drm_mm_for_each_node_safe(node, next, &mm)
 458                 drm_mm_remove_node(node);
 459         drm_mm_takedown(&mm);
 460         vfree(nodes);
 461         kfree(order);
 462 err:
 463         return ret;
 464 }
 465
 466 static void drm_test_mm_reserve(struct kunit *test)
 467 {
 468         const unsigned int count = min_t(unsigned int, BIT(10), max_iterations);
 469         int n;
 470
 471         for_each_prime_number_from(n, 1, 54) {
 472                 u64 size = BIT_ULL(n);
 473
 474                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_reserve(test, count, size - 1));
 475                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_reserve(test, count, size));
 476                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_reserve(test, count, size + 1));
 477
 478                 cond_resched();
 479         }
 480 }
 481
 482 static bool expect_insert(struct kunit *test, struct drm_mm *mm,
 483                           struct drm_mm_node *node, u64 size, u64 alignment, unsigned long color,
 484                         const struct insert_mode *mode)
 485 {
 486         int err;
 487
 488         err = drm_mm_insert_node_generic(mm, node,
 489                                          size, alignment, color,
 490                                          mode->mode);
 491         if (err) {
 492                 KUNIT_FAIL(test,
 493                            "insert (size=%llu, alignment=%llu, color=%lu, mode=%s) failed with err=%d\n",
 494                            size, alignment, color, mode->name, err);
 495                 return false;
 496         }
 497
 498         if (!assert_node(test, node, mm, size, alignment, color)) {
 499                 drm_mm_remove_node(node);
 500                 return false;
 501         }
 502
 503         return true;
 504 }
 505
 506 static bool expect_insert_fail(struct kunit *test, struct drm_mm *mm, u64 size)
 507 {
 508         struct drm_mm_node tmp = {};
 509         int err;
 510
 511         err = drm_mm_insert_node(mm, &tmp, size);
 512         if (likely(err == -ENOSPC))
 513                 return true;
 514
 515         if (!err) {
 516                 KUNIT_FAIL(test, "impossible insert succeeded, node %llu + %llu\n",
 517                            tmp.start, tmp.size);
 518                 drm_mm_remove_node(&tmp);
 519         } else {
 520                 KUNIT_FAIL(test,
 521                            "impossible insert failed with wrong error %d [expected %d], size %llu\n",
 522                            err, -ENOSPC, size);
 523         }
 524         return false;
 525 }
 526
 527 static int __drm_test_mm_insert(struct kunit *test, unsigned int count, u64 size, bool replace)
 528 {
 529         DRM_RND_STATE(prng, random_seed);
 530         const struct insert_mode *mode;
 531         struct drm_mm mm;
 532         struct drm_mm_node *nodes, *node, *next;
 533         unsigned int *order, n, m, o = 0;
 534         int ret;
 535
 536         /* Fill a range with lots of nodes, check it doesn't fail too early */
 537
 538         DRM_MM_BUG_ON(!count);
 539         DRM_MM_BUG_ON(!size);
 540
 541         ret = -ENOMEM;
 542         nodes = vmalloc(array_size(count, sizeof(*nodes)));
 543         KUNIT_ASSERT_TRUE(test, nodes);
 544
 545         order = drm_random_order(count, &prng);
 546         if (!order)
 547                 goto err_nodes;
 548
 549         ret = -EINVAL;
 550         drm_mm_init(&mm, 0, count * size);
 551
 552         for (mode = insert_modes; mode->name; mode++) {
 553                 for (n = 0; n < count; n++) {
 554                         struct drm_mm_node tmp;
 555
 556                         node = replace ? &tmp : &nodes[n];
 557                         memset(node, 0, sizeof(*node));
 558                         if (!expect_insert(test, &mm, node, size, 0, n, mode)) {
 559                                 KUNIT_FAIL(test, "%s insert failed, size %llu step %d\n",
 560                                            mode->name, size, n);
 561                                 goto out;
 562                         }
 563
 564                         if (replace) {
 565                                 drm_mm_replace_node(&tmp, &nodes[n]);
 566                                 if (drm_mm_node_allocated(&tmp)) {
 567                                         KUNIT_FAIL(test,
 568                                                    "replaced old-node still allocated! step %d\n",
 569                                                    n);
 570                                         goto out;
 571                                 }
 572
 573                                 if (!assert_node(test, &nodes[n], &mm, size, 0, n)) {
 574                                         KUNIT_FAIL(test,
 575                                                    "replaced node did not inherit parameters, size %llu step %d\n",
 576                                                    size, n);
 577                                         goto out;
 578                                 }
 579
 580                                 if (tmp.start != nodes[n].start) {
 581                                         KUNIT_FAIL(test,
 582                                                    "replaced node mismatch location expected [%llx + %llx], found [%llx + %llx]\n",
 583                                                    tmp.start, size, nodes[n].start, nodes[n].size);
 584                                         goto out;
 585                                 }
 586                         }
 587                 }
 588
 589                 /* After random insertion the nodes should be in order */
 590                 if (!assert_continuous(test, &mm, size))
 591                         goto out;
 592
 593                 /* Repeated use should then fail */
 594                 if (!expect_insert_fail(test, &mm, size))
 595                         goto out;
 596
 597                 /* Remove one and reinsert, as the only hole it should refill itself */
 598                 for (n = 0; n < count; n++) {
 599                         u64 addr = nodes[n].start;
 600
 601                         drm_mm_remove_node(&nodes[n]);
 602                         if (!expect_insert(test, &mm, &nodes[n], size, 0, n, mode)) {
 603                                 KUNIT_FAIL(test, "%s reinsert failed, size %llu step %d\n",
 604                                            mode->name, size, n);
 605                                 goto out;
 606                         }
 607
 608                         if (nodes[n].start != addr) {
 609                                 KUNIT_FAIL(test,
 610                                            "%s reinsert node moved, step %d, expected %llx, found %llx\n",
 611                                            mode->name, n, addr, nodes[n].start);
 612                                 goto out;
 613                         }
 614
 615                         if (!assert_continuous(test, &mm, size))
 616                                 goto out;
 617                 }
 618
 619                 /* Remove several, reinsert, check full */
 620                 for_each_prime_number(n, min(max_prime, count)) {
 621                         for (m = 0; m < n; m++) {
 622                                 node = &nodes[order[(o + m) % count]];
 623                                 drm_mm_remove_node(node);
 624                         }
 625
 626                         for (m = 0; m < n; m++) {
 627                                 node = &nodes[order[(o + m) % count]];
 628                                 if (!expect_insert(test, &mm, node, size, 0, n, mode)) {
 629                                         KUNIT_FAIL(test,
 630                                                    "%s multiple reinsert failed, size %llu step %d\n",
 631                                                            mode->name, size, n);
 632                                         goto out;
 633                                 }
 634                         }
 635
 636                         o += n;
 637
 638                         if (!assert_continuous(test, &mm, size))
 639                                 goto out;
 640
 641                         if (!expect_insert_fail(test, &mm, size))
 642                                 goto out;
 643                 }
 644
 645                 drm_mm_for_each_node_safe(node, next, &mm)
 646                         drm_mm_remove_node(node);
 647                 DRM_MM_BUG_ON(!drm_mm_clean(&mm));
 648
 649                 cond_resched();
 650         }
 651
 652         ret = 0;
 653 out:
 654         drm_mm_for_each_node_safe(node, next, &mm)
 655                 drm_mm_remove_node(node);
 656         drm_mm_takedown(&mm);
 657         kfree(order);
 658 err_nodes:
 659         vfree(nodes);
 660         return ret;
 661 }
 662
 663 static void drm_test_mm_insert(struct kunit *test)
 664 {
 665         const unsigned int count = min_t(unsigned int, BIT(10), max_iterations);
 666         unsigned int n;
 667
 668         for_each_prime_number_from(n, 1, 54) {
 669                 u64 size = BIT_ULL(n);
 670
 671                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert(test, count, size - 1, false));
 672                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert(test, count, size, false));
 673                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert(test, count, size + 1, false));
 674
 675                 cond_resched();
 676         }
 677 }
 678
 679 static void drm_test_mm_replace(struct kunit *test)
 680 {
 681         const unsigned int count = min_t(unsigned int, BIT(10), max_iterations);
 682         unsigned int n;
 683
 684         /* Reuse __drm_test_mm_insert to exercise replacement by inserting a dummy node,
 685          * then replacing it with the intended node. We want to check that
 686          * the tree is intact and all the information we need is carried
 687          * across to the target node.
 688          */
 689
 690         for_each_prime_number_from(n, 1, 54) {
 691                 u64 size = BIT_ULL(n);
 692
 693                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert(test, count, size - 1, true));
 694                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert(test, count, size, true));
 695                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert(test, count, size + 1, true));
 696
 697                 cond_resched();
 698         }
 699 }
 700
 701 static bool expect_insert_in_range(struct kunit *test, struct drm_mm *mm, struct drm_mm_node *node,
 702                                    u64 size, u64 alignment, unsigned long color,
 703                                    u64 range_start, u64 range_end, const struct insert_mode *mode)
 704 {
 705         int err;
 706
 707         err = drm_mm_insert_node_in_range(mm, node,
 708                                           size, alignment, color,
 709                                           range_start, range_end,
 710                                           mode->mode);
 711         if (err) {
 712                 KUNIT_FAIL(test,
 713                            "insert (size=%llu, alignment=%llu, color=%lu, mode=%s) nto range [%llx, %llx] failed with err=%d\n",
 714                                    size, alignment, color, mode->name,
 715                                    range_start, range_end, err);
 716                 return false;
 717         }
 718
 719         if (!assert_node(test, node, mm, size, alignment, color)) {
 720                 drm_mm_remove_node(node);
 721                 return false;
 722         }
 723
 724         return true;
 725 }
 726
 727 static bool expect_insert_in_range_fail(struct kunit *test, struct drm_mm *mm,
 728                                         u64 size, u64 range_start, u64 range_end)
 729 {
 730         struct drm_mm_node tmp = {};
 731         int err;
 732
 733         err = drm_mm_insert_node_in_range(mm, &tmp, size, 0, 0, range_start, range_end,
 734                                           0);
 735         if (likely(err == -ENOSPC))
 736                 return true;
 737
 738         if (!err) {
 739                 KUNIT_FAIL(test,
 740                            "impossible insert succeeded, node %llx + %llu, range [%llx, %llx]\n",
 741                                    tmp.start, tmp.size, range_start, range_end);
 742                 drm_mm_remove_node(&tmp);
 743         } else {
 744                 KUNIT_FAIL(test,
 745                            "impossible insert failed with wrong error %d [expected %d], size %llu, range [%llx, %llx]\n",
 746                                    err, -ENOSPC, size, range_start, range_end);
 747         }
 748
 749         return false;
 750 }
 751
 752 static bool assert_contiguous_in_range(struct kunit *test, struct drm_mm *mm,
 753                                        u64 size, u64 start, u64 end)
 754 {
 755         struct drm_mm_node *node;
 756         unsigned int n;
 757
 758         if (!expect_insert_in_range_fail(test, mm, size, start, end))
 759                 return false;
 760
 761         n = div64_u64(start + size - 1, size);
 762         drm_mm_for_each_node(node, mm) {
 763                 if (node->start < start || node->start + node->size > end) {
 764                         KUNIT_FAIL(test,
 765                                    "node %d out of range, address [%llx + %llu], range [%llx, %llx]\n",
 766                                            n, node->start, node->start + node->size, start, end);
 767                         return false;
 768                 }
 769
 770                 if (node->start != n * size) {
 771                         KUNIT_FAIL(test, "node %d out of order, expected start %llx, found %llx\n",
 772                                    n, n * size, node->start);
 773                         return false;
 774                 }
 775
 776                 if (node->size != size) {
 777                         KUNIT_FAIL(test, "node %d has wrong size, expected size %llx, found %llx\n",
 778                                    n, size, node->size);
 779                         return false;
 780                 }
 781
 782                 if (drm_mm_hole_follows(node) && drm_mm_hole_node_end(node) < end) {
 783                         KUNIT_FAIL(test, "node %d is followed by a hole!\n", n);
 784                         return false;
 785                 }
 786
 787                 n++;
 788         }
 789
 790         if (start > 0) {
 791                 node = __drm_mm_interval_first(mm, 0, start - 1);
 792                 if (drm_mm_node_allocated(node)) {
 793                         KUNIT_FAIL(test, "node before start: node=%llx+%llu, start=%llx\n",
 794                                    node->start, node->size, start);
 795                         return false;
 796                 }
 797         }
 798
 799         if (end < U64_MAX) {
 800                 node = __drm_mm_interval_first(mm, end, U64_MAX);
 801                 if (drm_mm_node_allocated(node)) {
 802                         KUNIT_FAIL(test, "node after end: node=%llx+%llu, end=%llx\n",
 803                                    node->start, node->size, end);
 804                         return false;
 805                 }
 806         }
 807
 808         return true;
 809 }
 810
 811 static int __drm_test_mm_insert_range(struct kunit *test, unsigned int count, u64 size,
 812                                       u64 start, u64 end)
 813 {
 814         const struct insert_mode *mode;
 815         struct drm_mm mm;
 816         struct drm_mm_node *nodes, *node, *next;
 817         unsigned int n, start_n, end_n;
 818         int ret;
 819
 820         DRM_MM_BUG_ON(!count);
 821         DRM_MM_BUG_ON(!size);
 822         DRM_MM_BUG_ON(end <= start);
 823
 824         /* Very similar to __drm_test_mm_insert(), but now instead of populating the
 825          * full range of the drm_mm, we try to fill a small portion of it.
 826          */
 827
 828         ret = -ENOMEM;
 829         nodes = vzalloc(array_size(count, sizeof(*nodes)));
 830         KUNIT_ASSERT_TRUE(test, nodes);
 831
 832         ret = -EINVAL;
 833         drm_mm_init(&mm, 0, count * size);
 834
 835         start_n = div64_u64(start + size - 1, size);
 836         end_n = div64_u64(end - size, size);
 837
 838         for (mode = insert_modes; mode->name; mode++) {
 839                 for (n = start_n; n <= end_n; n++) {
 840                         if (!expect_insert_in_range(test, &mm, &nodes[n], size, size, n,
 841                                                     start, end, mode)) {
 842                                 KUNIT_FAIL(test,
 843                                            "%s insert failed, size %llu, step %d [%d, %d], range [%llx, %llx]\n",
 844                                                    mode->name, size, n, start_n, end_n, start, end);
 845                                 goto out;
 846                         }
 847                 }
 848
 849                 if (!assert_contiguous_in_range(test, &mm, size, start, end)) {
 850                         KUNIT_FAIL(test,
 851                                    "%s: range [%llx, %llx] not full after initialisation, size=%llu\n",
 852                                    mode->name, start, end, size);
 853                         goto out;
 854                 }
 855
 856                 /* Remove one and reinsert, it should refill itself */
 857                 for (n = start_n; n <= end_n; n++) {
 858                         u64 addr = nodes[n].start;
 859
 860                         drm_mm_remove_node(&nodes[n]);
 861                         if (!expect_insert_in_range(test, &mm, &nodes[n], size, size, n,
 862                                                     start, end, mode)) {
 863                                 KUNIT_FAIL(test, "%s reinsert failed, step %d\n", mode->name, n);
 864                                 goto out;
 865                         }
 866
 867                         if (nodes[n].start != addr) {
 868                                 KUNIT_FAIL(test,
 869                                            "%s reinsert node moved, step %d, expected %llx, found %llx\n",
 870                                            mode->name, n, addr, nodes[n].start);
 871                                 goto out;
 872                         }
 873                 }
 874
 875                 if (!assert_contiguous_in_range(test, &mm, size, start, end)) {
 876                         KUNIT_FAIL(test,
 877                                    "%s: range [%llx, %llx] not full after reinsertion, size=%llu\n",
 878                                    mode->name, start, end, size);
 879                         goto out;
 880                 }
 881
 882                 drm_mm_for_each_node_safe(node, next, &mm)
 883                         drm_mm_remove_node(node);
 884                 DRM_MM_BUG_ON(!drm_mm_clean(&mm));
 885
 886                 cond_resched();
 887         }
 888
 889         ret = 0;
 890 out:
 891         drm_mm_for_each_node_safe(node, next, &mm)
 892                 drm_mm_remove_node(node);
 893         drm_mm_takedown(&mm);
 894         vfree(nodes);
 895         return ret;
 896 }
 897
 898 static int insert_outside_range(struct kunit *test)
 899 {
 900         struct drm_mm mm;
 901         const unsigned int start = 1024;
 902         const unsigned int end = 2048;
 903         const unsigned int size = end - start;
 904
 905         drm_mm_init(&mm, start, size);
 906
 907         if (!expect_insert_in_range_fail(test, &mm, 1, 0, start))
 908                 return -EINVAL;
 909
 910         if (!expect_insert_in_range_fail(test, &mm, size,
 911                                          start - size / 2, start + (size + 1) / 2))
 912                 return -EINVAL;
 913
 914         if (!expect_insert_in_range_fail(test, &mm, size,
 915                                          end - (size + 1) / 2, end + size / 2))
 916                 return -EINVAL;
 917
 918         if (!expect_insert_in_range_fail(test, &mm, 1, end, end + size))
 919                 return -EINVAL;
 920
 921         drm_mm_takedown(&mm);
 922         return 0;
 923 }
 924
 925 static void drm_test_mm_insert_range(struct kunit *test)
 926 {
 927         const unsigned int count = min_t(unsigned int, BIT(13), max_iterations);
 928         unsigned int n;
 929
 930         /* Check that requests outside the bounds of drm_mm are rejected. */
 931         KUNIT_ASSERT_FALSE(test, insert_outside_range(test));
 932
 933         for_each_prime_number_from(n, 1, 50) {
 934                 const u64 size = BIT_ULL(n);
 935                 const u64 max = count * size;
 936
 937                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert_range(test, count, size, 0, max));
 938                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert_range(test, count, size, 1, max));
 939                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert_range(test, count, size, 0, max - 1));
 940                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert_range(test, count, size, 0, max / 2));
 941                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert_range(test, count, size,
 942                                                                     max / 2, max));
 943                 KUNIT_ASSERT_FALSE(test, __drm_test_mm_insert_range(test, count, size,
 944                                                                     max / 4 + 1, 3 * max / 4 - 1));
 945
 946                 cond_resched();
 947         }
 948 }
 949
 950 static int prepare_frag(struct kunit *test, struct drm_mm *mm, struct drm_mm_node *nodes,
 951                         unsigned int num_insert, const struct insert_mode *mode)
 952 {
 953         unsigned int size = 4096;
 954         unsigned int i;
 955
 956         for (i = 0; i < num_insert; i++) {
 957                 if (!expect_insert(test, mm, &nodes[i], size, 0, i, mode) != 0) {
 958                         KUNIT_FAIL(test, "%s insert failed\n", mode->name);
 959                         return -EINVAL;
 960                 }
 961         }
 962
 963         /* introduce fragmentation by freeing every other node */
 964         for (i = 0; i < num_insert; i++) {
 965                 if (i % 2 == 0)
 966                         drm_mm_remove_node(&nodes[i]);
 967         }
 968
 969         return 0;
 970 }
 971
 972 static u64 get_insert_time(struct kunit *test, struct drm_mm *mm,
 973                            unsigned int num_insert, struct drm_mm_node *nodes,
 974                            const struct insert_mode *mode)
 975 {
 976         unsigned int size = 8192;
 977         ktime_t start;
 978         unsigned int i;
 979
 980         start = ktime_get();
 981         for (i = 0; i < num_insert; i++) {
 982                 if (!expect_insert(test, mm, &nodes[i], size, 0, i, mode) != 0) {
 983                         KUNIT_FAIL(test, "%s insert failed\n", mode->name);
 984                         return 0;
 985                 }
 986         }
 987
 988         return ktime_to_ns(ktime_sub(ktime_get(), start));
 989 }
 990
 991 static void drm_test_mm_frag(struct kunit *test)
 992 {
 993         struct drm_mm mm;
 994         const struct insert_mode *mode;
 995         struct drm_mm_node *nodes, *node, *next;
 996         unsigned int insert_size = 10000;
 997         unsigned int scale_factor = 4;
 998
 999         /* We need 4 * insert_size nodes to hold intermediate allocated
1000          * drm_mm nodes.
1001          * 1 times for prepare_frag()
1002          * 1 times for get_insert_time()
1003          * 2 times for get_insert_time()
1004          */
1005         nodes = vzalloc(array_size(insert_size * 4, sizeof(*nodes)));
1006         KUNIT_ASSERT_TRUE(test, nodes);
1007
1008         /* For BOTTOMUP and TOPDOWN, we first fragment the
1009          * address space using prepare_frag() and then try to verify
1010          * that insertions scale quadratically from 10k to 20k insertions
1011          */
1012         drm_mm_init(&mm, 1, U64_MAX - 2);
1013         for (mode = insert_modes; mode->name; mode++) {
1014                 u64 insert_time1, insert_time2;
1015
1016                 if (mode->mode != DRM_MM_INSERT_LOW &&
1017                     mode->mode != DRM_MM_INSERT_HIGH)
1018                         continue;
1019
1020                 if (prepare_frag(test, &mm, nodes, insert_size, mode))
1021                         goto err;
1022
1023                 insert_time1 = get_insert_time(test, &mm, insert_size,
1024                                                nodes + insert_size, mode);
1025                 if (insert_time1 == 0)
1026                         goto err;
1027
1028                 insert_time2 = get_insert_time(test, &mm, (insert_size * 2),
1029                                                nodes + insert_size * 2, mode);
1030                 if (insert_time2 == 0)
1031                         goto err;
1032
1033                 kunit_info(test, "%s fragmented insert of %u and %u insertions took %llu and %llu nsecs\n",
1034                            mode->name, insert_size, insert_size * 2, insert_time1, insert_time2);
1035
1036                 if (insert_time2 > (scale_factor * insert_time1)) {
1037                         KUNIT_FAIL(test, "%s fragmented insert took %llu nsecs more\n",
1038                                    mode->name, insert_time2 - (scale_factor * insert_time1));
1039                         goto err;
1040                 }
1041
1042                 drm_mm_for_each_node_safe(node, next, &mm)
1043                         drm_mm_remove_node(node);
1044         }
1045
1046 err:
1047         drm_mm_for_each_node_safe(node, next, &mm)
1048                 drm_mm_remove_node(node);
1049         drm_mm_takedown(&mm);
1050         vfree(nodes);
1051 }
1052
1053 static void drm_test_mm_align(struct kunit *test)
1054 {
1055         const struct insert_mode *mode;
1056         const unsigned int max_count = min(8192u, max_prime);
1057         struct drm_mm mm;
1058         struct drm_mm_node *nodes, *node, *next;
1059         unsigned int prime;
1060
1061         /* For each of the possible insertion modes, we pick a few
1062          * arbitrary alignments and check that the inserted node
1063          * meets our requirements.
1064          */
1065
1066         nodes = vzalloc(array_size(max_count, sizeof(*nodes)));
1067         KUNIT_ASSERT_TRUE(test, nodes);
1068
1069         drm_mm_init(&mm, 1, U64_MAX - 2);
1070
1071         for (mode = insert_modes; mode->name; mode++) {
1072                 unsigned int i = 0;
1073
1074                 for_each_prime_number_from(prime, 1, max_count) {
1075                         u64 size = next_prime_number(prime);
1076
1077                         if (!expect_insert(test, &mm, &nodes[i], size, prime, i, mode)) {
1078                                 KUNIT_FAIL(test, "%s insert failed with alignment=%d",
1079                                            mode->name, prime);
1080                                 goto out;
1081                         }
1082
1083                         i++;
1084                 }
1085
1086                 drm_mm_for_each_node_safe(node, next, &mm)
1087                         drm_mm_remove_node(node);
1088                 DRM_MM_BUG_ON(!drm_mm_clean(&mm));
1089
1090                 cond_resched();
1091         }
1092
1093 out:
1094         drm_mm_for_each_node_safe(node, next, &mm)
1095                 drm_mm_remove_node(node);
1096         drm_mm_takedown(&mm);
1097         vfree(nodes);
1098 }
1099
1100 static void drm_test_mm_align_pot(struct kunit *test, int max)
1101 {
1102         struct drm_mm mm;
1103         struct drm_mm_node *node, *next;
1104         int bit;
1105
1106         /* Check that we can align to the full u64 address space */
1107
1108         drm_mm_init(&mm, 1, U64_MAX - 2);
1109
1110         for (bit = max - 1; bit; bit--) {
1111                 u64 align, size;
1112
1113                 node = kzalloc(sizeof(*node), GFP_KERNEL);
1114                 if (!node) {
1115                         KUNIT_FAIL(test, "failed to allocate node");
1116                         goto out;
1117                 }
1118
1119                 align = BIT_ULL(bit);
1120                 size = BIT_ULL(bit - 1) + 1;
1121                 if (!expect_insert(test, &mm, node, size, align, bit, &insert_modes[0])) {
1122                         KUNIT_FAIL(test, "insert failed with alignment=%llx [%d]", align, bit);
1123                         goto out;
1124                 }
1125
1126                 cond_resched();
1127         }
1128
1129 out:
1130         drm_mm_for_each_node_safe(node, next, &mm) {
1131                 drm_mm_remove_node(node);
1132                 kfree(node);
1133         }
1134         drm_mm_takedown(&mm);
1135 }
1136
1137 static void drm_test_mm_align32(struct kunit *test)
1138 {
1139         drm_test_mm_align_pot(test, 32);
1140 }
1141
1142 static void drm_test_mm_align64(struct kunit *test)
1143 {
1144         drm_test_mm_align_pot(test, 64);
1145 }
1146
1147 static void show_scan(struct kunit *test, const struct drm_mm_scan *scan)
1148 {
1149         kunit_info(test, "scan: hit [%llx, %llx], size=%lld, align=%lld, color=%ld\n",
1150                    scan->hit_start, scan->hit_end, scan->size, scan->alignment, scan->color);
1151 }
1152
1153 static void show_holes(struct kunit *test, const struct drm_mm *mm, int count)
1154 {
1155         u64 hole_start, hole_end;
1156         struct drm_mm_node *hole;
1157
1158         drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
1159                 struct drm_mm_node *next = list_next_entry(hole, node_list);
1160                 const char *node1 = NULL, *node2 = NULL;
1161
1162                 if (drm_mm_node_allocated(hole))
1163                         node1 = kasprintf(GFP_KERNEL, "[%llx + %lld, color=%ld], ",
1164                                           hole->start, hole->size, hole->color);
1165
1166                 if (drm_mm_node_allocated(next))
1167                         node2 = kasprintf(GFP_KERNEL, ", [%llx + %lld, color=%ld]",
1168                                           next->start, next->size, next->color);
1169
1170                 kunit_info(test, "%sHole [%llx - %llx, size %lld]%s\n", node1,
1171                            hole_start, hole_end, hole_end - hole_start, node2);
1172
1173                 kfree(node2);
1174                 kfree(node1);
1175
1176                 if (!--count)
1177                         break;
1178         }
1179 }
1180
1181 struct evict_node {
1182         struct drm_mm_node node;
1183         struct list_head link;
1184 };
1185
1186 static bool evict_nodes(struct kunit *test, struct drm_mm_scan *scan,
1187                         struct evict_node *nodes, unsigned int *order, unsigned int count,
1188                         bool use_color, struct list_head *evict_list)
1189 {
1190         struct evict_node *e, *en;
1191         unsigned int i;
1192
1193         for (i = 0; i < count; i++) {
1194                 e = &nodes[order ? order[i] : i];
1195                 list_add(&e->link, evict_list);
1196                 if (drm_mm_scan_add_block(scan, &e->node))
1197                         break;
1198         }
1199         list_for_each_entry_safe(e, en, evict_list, link) {
1200                 if (!drm_mm_scan_remove_block(scan, &e->node))
1201                         list_del(&e->link);
1202         }
1203         if (list_empty(evict_list)) {
1204                 KUNIT_FAIL(test,
1205                            "Failed to find eviction: size=%lld [avail=%d], align=%lld (color=%lu)\n",
1206                            scan->size, count, scan->alignment, scan->color);
1207                 return false;
1208         }
1209
1210         list_for_each_entry(e, evict_list, link)
1211                 drm_mm_remove_node(&e->node);
1212
1213         if (use_color) {
1214                 struct drm_mm_node *node;
1215
1216                 while ((node = drm_mm_scan_color_evict(scan))) {
1217                         e = container_of(node, typeof(*e), node);
1218                         drm_mm_remove_node(&e->node);
1219                         list_add(&e->link, evict_list);
1220                 }
1221         } else {
1222                 if (drm_mm_scan_color_evict(scan)) {
1223                         KUNIT_FAIL(test,
1224                                    "drm_mm_scan_color_evict unexpectedly reported overlapping nodes!\n");
1225                         return false;
1226                 }
1227         }
1228
1229         return true;
1230 }
1231
1232 static bool evict_nothing(struct kunit *test, struct drm_mm *mm,
1233                           unsigned int total_size, struct evict_node *nodes)
1234 {
1235         struct drm_mm_scan scan;
1236         LIST_HEAD(evict_list);
1237         struct evict_node *e;
1238         struct drm_mm_node *node;
1239         unsigned int n;
1240
1241         drm_mm_scan_init(&scan, mm, 1, 0, 0, 0);
1242         for (n = 0; n < total_size; n++) {
1243                 e = &nodes[n];
1244                 list_add(&e->link, &evict_list);
1245                 drm_mm_scan_add_block(&scan, &e->node);
1246         }
1247         list_for_each_entry(e, &evict_list, link)
1248                 drm_mm_scan_remove_block(&scan, &e->node);
1249
1250         for (n = 0; n < total_size; n++) {
1251                 e = &nodes[n];
1252
1253                 if (!drm_mm_node_allocated(&e->node)) {
1254                         KUNIT_FAIL(test, "node[%d] no longer allocated!\n", n);
1255                         return false;
1256                 }
1257
1258                 e->link.next = NULL;
1259         }
1260
1261         drm_mm_for_each_node(node, mm) {
1262                 e = container_of(node, typeof(*e), node);
1263                 e->link.next = &e->link;
1264         }
1265
1266         for (n = 0; n < total_size; n++) {
1267                 e = &nodes[n];
1268
1269                 if (!e->link.next) {
1270                         KUNIT_FAIL(test, "node[%d] no longer connected!\n", n);
1271                         return false;
1272                 }
1273         }
1274
1275         return assert_continuous(test, mm, nodes[0].node.size);
1276 }
1277
1278 static bool evict_everything(struct kunit *test, struct drm_mm *mm,
1279                              unsigned int total_size, struct evict_node *nodes)
1280 {
1281         struct drm_mm_scan scan;
1282         LIST_HEAD(evict_list);
1283         struct evict_node *e;
1284         unsigned int n;
1285         int err;
1286
1287         drm_mm_scan_init(&scan, mm, total_size, 0, 0, 0);
1288         for (n = 0; n < total_size; n++) {
1289                 e = &nodes[n];
1290                 list_add(&e->link, &evict_list);
1291                 if (drm_mm_scan_add_block(&scan, &e->node))
1292                         break;
1293         }
1294
1295         err = 0;
1296         list_for_each_entry(e, &evict_list, link) {
1297                 if (!drm_mm_scan_remove_block(&scan, &e->node)) {
1298                         if (!err) {
1299                                 KUNIT_FAIL(test, "Node %lld not marked for eviction!\n",
1300                                            e->node.start);
1301                                 err = -EINVAL;
1302                         }
1303                 }
1304         }
1305         if (err)
1306                 return false;
1307
1308         list_for_each_entry(e, &evict_list, link)
1309                 drm_mm_remove_node(&e->node);
1310
1311         if (!assert_one_hole(test, mm, 0, total_size))
1312                 return false;
1313
1314         list_for_each_entry(e, &evict_list, link) {
1315                 err = drm_mm_reserve_node(mm, &e->node);
1316                 if (err) {
1317                         KUNIT_FAIL(test, "Failed to reinsert node after eviction: start=%llx\n",
1318                                    e->node.start);
1319                         return false;
1320                 }
1321         }
1322
1323         return assert_continuous(test, mm, nodes[0].node.size);
1324 }
1325
1326 static int evict_something(struct kunit *test, struct drm_mm *mm,
1327                            u64 range_start, u64 range_end, struct evict_node *nodes,
1328                            unsigned int *order, unsigned int count, unsigned int size,
1329                            unsigned int alignment, const struct insert_mode *mode)
1330 {
1331         struct drm_mm_scan scan;
1332         LIST_HEAD(evict_list);
1333         struct evict_node *e;
1334         struct drm_mm_node tmp;
1335         int err;
1336
1337         drm_mm_scan_init_with_range(&scan, mm, size, alignment, 0, range_start,
1338                                     range_end, mode->mode);
1339         if (!evict_nodes(test, &scan, nodes, order, count, false, &evict_list))
1340                 return -EINVAL;
1341
1342         memset(&tmp, 0, sizeof(tmp));
1343         err = drm_mm_insert_node_generic(mm, &tmp, size, alignment, 0,
1344                                          DRM_MM_INSERT_EVICT);
1345         if (err) {
1346                 KUNIT_FAIL(test, "Failed to insert into eviction hole: size=%d, align=%d\n",
1347                            size, alignment);
1348                 show_scan(test, &scan);
1349                 show_holes(test, mm, 3);
1350                 return err;
1351         }
1352
1353         if (tmp.start < range_start || tmp.start + tmp.size > range_end) {
1354                 KUNIT_FAIL(test,
1355                            "Inserted [address=%llu + %llu] did not fit into the request range [%llu, %llu]\n",
1356                            tmp.start, tmp.size, range_start, range_end);
1357                 err = -EINVAL;
1358         }
1359
1360         if (!assert_node(test, &tmp, mm, size, alignment, 0) ||
1361             drm_mm_hole_follows(&tmp)) {
1362                 KUNIT_FAIL(test,
1363                            "Inserted did not fill the eviction hole: size=%lld [%d], align=%d [rem=%lld], start=%llx, hole-follows?=%d\n",
1364                            tmp.size, size, alignment, misalignment(&tmp, alignment),
1365                            tmp.start, drm_mm_hole_follows(&tmp));
1366                 err = -EINVAL;
1367         }
1368
1369         drm_mm_remove_node(&tmp);
1370         if (err)
1371                 return err;
1372
1373         list_for_each_entry(e, &evict_list, link) {
1374                 err = drm_mm_reserve_node(mm, &e->node);
1375                 if (err) {
1376                         KUNIT_FAIL(test, "Failed to reinsert node after eviction: start=%llx\n",
1377                                    e->node.start);
1378                         return err;
1379                 }
1380         }
1381
1382         if (!assert_continuous(test, mm, nodes[0].node.size)) {
1383                 KUNIT_FAIL(test, "range is no longer continuous\n");
1384                 return -EINVAL;
1385         }
1386
1387         return 0;
1388 }
1389
1390 static void drm_test_mm_evict(struct kunit *test)
1391 {
1392         DRM_RND_STATE(prng, random_seed);
1393         const unsigned int size = 8192;
1394         const struct insert_mode *mode;
1395         struct drm_mm mm;
1396         struct evict_node *nodes;
1397         struct drm_mm_node *node, *next;
1398         unsigned int *order, n;
1399
1400         /* Here we populate a full drm_mm and then try and insert a new node
1401          * by evicting other nodes in a random order. The drm_mm_scan should
1402          * pick the first matching hole it finds from the random list. We
1403          * repeat that for different allocation strategies, alignments and
1404          * sizes to try and stress the hole finder.
1405          */
1406
1407         nodes = vzalloc(array_size(size, sizeof(*nodes)));
1408         KUNIT_ASSERT_TRUE(test, nodes);
1409
1410         order = drm_random_order(size, &prng);
1411         if (!order)
1412                 goto err_nodes;
1413
1414         drm_mm_init(&mm, 0, size);
1415         for (n = 0; n < size; n++) {
1416                 if (drm_mm_insert_node(&mm, &nodes[n].node, 1)) {
1417                         KUNIT_FAIL(test, "insert failed, step %d\n", n);
1418                         goto out;
1419                 }
1420         }
1421
1422         /* First check that using the scanner doesn't break the mm */
1423         if (!evict_nothing(test, &mm, size, nodes)) {
1424                 KUNIT_FAIL(test, "evict_nothing() failed\n");
1425                 goto out;
1426         }
1427         if (!evict_everything(test, &mm, size, nodes)) {
1428                 KUNIT_FAIL(test, "evict_everything() failed\n");
1429                 goto out;
1430         }
1431
1432         for (mode = evict_modes; mode->name; mode++) {
1433                 for (n = 1; n <= size; n <<= 1) {
1434                         drm_random_reorder(order, size, &prng);
1435                         if (evict_something(test, &mm, 0, U64_MAX, nodes, order, size, n, 1,
1436                                             mode)) {
1437                                 KUNIT_FAIL(test, "%s evict_something(size=%u) failed\n",
1438                                            mode->name, n);
1439                                 goto out;
1440                         }
1441                 }
1442
1443                 for (n = 1; n < size; n <<= 1) {
1444                         drm_random_reorder(order, size, &prng);
1445                         if (evict_something(test, &mm, 0, U64_MAX, nodes, order, size,
1446                                             size / 2, n, mode)) {
1447                                 KUNIT_FAIL(test,
1448                                            "%s evict_something(size=%u, alignment=%u) failed\n",
1449                                            mode->name, size / 2, n);
1450                                 goto out;
1451                         }
1452                 }
1453
1454                 for_each_prime_number_from(n, 1, min(size, max_prime)) {
1455                         unsigned int nsize = (size - n + 1) / 2;
1456
1457                         DRM_MM_BUG_ON(!nsize);
1458
1459                         drm_random_reorder(order, size, &prng);
1460                         if (evict_something(test, &mm, 0, U64_MAX, nodes, order, size,
1461                                             nsize, n, mode)) {
1462                                 KUNIT_FAIL(test,
1463                                            "%s evict_something(size=%u, alignment=%u) failed\n",
1464                                            mode->name, nsize, n);
1465                                 goto out;
1466                         }
1467                 }
1468
1469                 cond_resched();
1470         }
1471
1472 out:
1473         drm_mm_for_each_node_safe(node, next, &mm)
1474                 drm_mm_remove_node(node);
1475         drm_mm_takedown(&mm);
1476         kfree(order);
1477 err_nodes:
1478         vfree(nodes);
1479 }
1480
1481 static void drm_test_mm_evict_range(struct kunit *test)
1482 {
1483         DRM_RND_STATE(prng, random_seed);
1484         const unsigned int size = 8192;
1485         const unsigned int range_size = size / 2;
1486         const unsigned int range_start = size / 4;
1487         const unsigned int range_end = range_start + range_size;
1488         const struct insert_mode *mode;
1489         struct drm_mm mm;
1490         struct evict_node *nodes;
1491         struct drm_mm_node *node, *next;
1492         unsigned int *order, n;
1493
1494         /* Like drm_test_mm_evict() but now we are limiting the search to a
1495          * small portion of the full drm_mm.
1496          */
1497
1498         nodes = vzalloc(array_size(size, sizeof(*nodes)));
1499         KUNIT_ASSERT_TRUE(test, nodes);
1500
1501         order = drm_random_order(size, &prng);
1502         if (!order)
1503                 goto err_nodes;
1504
1505         drm_mm_init(&mm, 0, size);
1506         for (n = 0; n < size; n++) {
1507                 if (drm_mm_insert_node(&mm, &nodes[n].node, 1)) {
1508                         KUNIT_FAIL(test, "insert failed, step %d\n", n);
1509                         goto out;
1510                 }
1511         }
1512
1513         for (mode = evict_modes; mode->name; mode++) {
1514                 for (n = 1; n <= range_size; n <<= 1) {
1515                         drm_random_reorder(order, size, &prng);
1516                         if (evict_something(test, &mm, range_start, range_end, nodes,
1517                                             order, size, n, 1, mode)) {
1518                                 KUNIT_FAIL(test,
1519                                            "%s evict_something(size=%u) failed with range [%u, %u]\n",
1520                                            mode->name, n, range_start, range_end);
1521                                 goto out;
1522                         }
1523                 }
1524
1525                 for (n = 1; n <= range_size; n <<= 1) {
1526                         drm_random_reorder(order, size, &prng);
1527                         if (evict_something(test, &mm, range_start, range_end, nodes,
1528                                             order, size, range_size / 2, n, mode)) {
1529                                 KUNIT_FAIL(test,
1530                                            "%s evict_something(size=%u, alignment=%u) failed with range [%u, %u]\n",
1531                                            mode->name, range_size / 2, n, range_start, range_end);
1532                                 goto out;
1533                         }
1534                 }
1535
1536                 for_each_prime_number_from(n, 1, min(range_size, max_prime)) {
1537                         unsigned int nsize = (range_size - n + 1) / 2;
1538
1539                         DRM_MM_BUG_ON(!nsize);
1540
1541                         drm_random_reorder(order, size, &prng);
1542                         if (evict_something(test, &mm, range_start, range_end, nodes,
1543                                             order, size, nsize, n, mode)) {
1544                                 KUNIT_FAIL(test,
1545                                            "%s evict_something(size=%u, alignment=%u) failed with range [%u, %u]\n",
1546                                            mode->name, nsize, n, range_start, range_end);
1547                                 goto out;
1548                         }
1549                 }
1550
1551                 cond_resched();
1552         }
1553
1554 out:
1555         drm_mm_for_each_node_safe(node, next, &mm)
1556                 drm_mm_remove_node(node);
1557         drm_mm_takedown(&mm);
1558         kfree(order);
1559 err_nodes:
1560         vfree(nodes);
1561 }
1562
1563 static unsigned int node_index(const struct drm_mm_node *node)
1564 {
1565         return div64_u64(node->start, node->size);
1566 }
1567
1568 static void drm_test_mm_topdown(struct kunit *test)
1569 {
1570         const struct insert_mode *topdown = &insert_modes[TOPDOWN];
1571
1572         DRM_RND_STATE(prng, random_seed);
1573         const unsigned int count = 8192;
1574         unsigned int size;
1575         unsigned long *bitmap;
1576         struct drm_mm mm;
1577         struct drm_mm_node *nodes, *node, *next;
1578         unsigned int *order, n, m, o = 0;
1579
1580         /* When allocating top-down, we expect to be returned a node
1581          * from a suitable hole at the top of the drm_mm. We check that
1582          * the returned node does match the highest available slot.
1583          */
1584
1585         nodes = vzalloc(array_size(count, sizeof(*nodes)));
1586         KUNIT_ASSERT_TRUE(test, nodes);
1587
1588         bitmap = bitmap_zalloc(count, GFP_KERNEL);
1589         if (!bitmap)
1590                 goto err_nodes;
1591
1592         order = drm_random_order(count, &prng);
1593         if (!order)
1594                 goto err_bitmap;
1595
1596         for (size = 1; size <= 64; size <<= 1) {
1597                 drm_mm_init(&mm, 0, size * count);
1598                 for (n = 0; n < count; n++) {
1599                         if (!expect_insert(test, &mm, &nodes[n], size, 0, n, topdown)) {
1600                                 KUNIT_FAIL(test, "insert failed, size %u step %d\n", size, n);
1601                                 goto out;
1602                         }
1603
1604                         if (drm_mm_hole_follows(&nodes[n])) {
1605                                 KUNIT_FAIL(test,
1606                                            "hole after topdown insert %d, start=%llx\n, size=%u",
1607                                            n, nodes[n].start, size);
1608                                 goto out;
1609                         }
1610
1611                         if (!assert_one_hole(test, &mm, 0, size * (count - n - 1)))
1612                                 goto out;
1613                 }
1614
1615                 if (!assert_continuous(test, &mm, size))
1616                         goto out;
1617
1618                 drm_random_reorder(order, count, &prng);
1619                 for_each_prime_number_from(n, 1, min(count, max_prime)) {
1620                         for (m = 0; m < n; m++) {
1621                                 node = &nodes[order[(o + m) % count]];
1622                                 drm_mm_remove_node(node);
1623                                 __set_bit(node_index(node), bitmap);
1624                         }
1625
1626                         for (m = 0; m < n; m++) {
1627                                 unsigned int last;
1628
1629                                 node = &nodes[order[(o + m) % count]];
1630                                 if (!expect_insert(test, &mm, node, size, 0, 0, topdown)) {
1631                                         KUNIT_FAIL(test, "insert failed, step %d/%d\n", m, n);
1632                                         goto out;
1633                                 }
1634
1635                                 if (drm_mm_hole_follows(node)) {
1636                                         KUNIT_FAIL(test,
1637                                                    "hole after topdown insert %d/%d, start=%llx\n",
1638                                                    m, n, node->start);
1639                                         goto out;
1640                                 }
1641
1642                                 last = find_last_bit(bitmap, count);
1643                                 if (node_index(node) != last) {
1644                                         KUNIT_FAIL(test,
1645                                                    "node %d/%d, size %d, not inserted into upmost hole, expected %d, found %d\n",
1646                                                    m, n, size, last, node_index(node));
1647                                         goto out;
1648                                 }
1649
1650                                 __clear_bit(last, bitmap);
1651                         }
1652
1653                         DRM_MM_BUG_ON(find_first_bit(bitmap, count) != count);
1654
1655                         o += n;
1656                 }
1657
1658                 drm_mm_for_each_node_safe(node, next, &mm)
1659                         drm_mm_remove_node(node);
1660                 DRM_MM_BUG_ON(!drm_mm_clean(&mm));
1661                 cond_resched();
1662         }
1663
1664 out:
1665         drm_mm_for_each_node_safe(node, next, &mm)
1666                 drm_mm_remove_node(node);
1667         drm_mm_takedown(&mm);
1668         kfree(order);
1669 err_bitmap:
1670         bitmap_free(bitmap);
1671 err_nodes:
1672         vfree(nodes);
1673 }
1674
1675 static void drm_test_mm_bottomup(struct kunit *test)
1676 {
1677         const struct insert_mode *bottomup = &insert_modes[BOTTOMUP];
1678
1679         DRM_RND_STATE(prng, random_seed);
1680         const unsigned int count = 8192;
1681         unsigned int size;
1682         unsigned long *bitmap;
1683         struct drm_mm mm;
1684         struct drm_mm_node *nodes, *node, *next;
1685         unsigned int *order, n, m, o = 0;
1686
1687         /* Like drm_test_mm_topdown, but instead of searching for the last hole,
1688          * we search for the first.
1689          */
1690
1691         nodes = vzalloc(array_size(count, sizeof(*nodes)));
1692         KUNIT_ASSERT_TRUE(test, nodes);
1693
1694         bitmap = bitmap_zalloc(count, GFP_KERNEL);
1695         if (!bitmap)
1696                 goto err_nodes;
1697
1698         order = drm_random_order(count, &prng);
1699         if (!order)
1700                 goto err_bitmap;
1701
1702         for (size = 1; size <= 64; size <<= 1) {
1703                 drm_mm_init(&mm, 0, size * count);
1704                 for (n = 0; n < count; n++) {
1705                         if (!expect_insert(test, &mm, &nodes[n], size, 0, n, bottomup)) {
1706                                 KUNIT_FAIL(test,
1707                                            "bottomup insert failed, size %u step %d\n", size, n);
1708                                 goto out;
1709                         }
1710
1711                         if (!assert_one_hole(test, &mm, size * (n + 1), size * count))
1712                                 goto out;
1713                 }
1714
1715                 if (!assert_continuous(test, &mm, size))
1716                         goto out;
1717
1718                 drm_random_reorder(order, count, &prng);
1719                 for_each_prime_number_from(n, 1, min(count, max_prime)) {
1720                         for (m = 0; m < n; m++) {
1721                                 node = &nodes[order[(o + m) % count]];
1722                                 drm_mm_remove_node(node);
1723                                 __set_bit(node_index(node), bitmap);
1724                         }
1725
1726                         for (m = 0; m < n; m++) {
1727                                 unsigned int first;
1728
1729                                 node = &nodes[order[(o + m) % count]];
1730                                 if (!expect_insert(test, &mm, node, size, 0, 0, bottomup)) {
1731                                         KUNIT_FAIL(test, "insert failed, step %d/%d\n", m, n);
1732                                         goto out;
1733                                 }
1734
1735                                 first = find_first_bit(bitmap, count);
1736                                 if (node_index(node) != first) {
1737                                         KUNIT_FAIL(test,
1738                                                    "node %d/%d not inserted into bottom hole, expected %d, found %d\n",
1739                                                    m, n, first, node_index(node));
1740                                         goto out;
1741                                 }
1742                                 __clear_bit(first, bitmap);
1743                         }
1744
1745                         DRM_MM_BUG_ON(find_first_bit(bitmap, count) != count);
1746
1747                         o += n;
1748                 }
1749
1750                 drm_mm_for_each_node_safe(node, next, &mm)
1751                         drm_mm_remove_node(node);
1752                 DRM_MM_BUG_ON(!drm_mm_clean(&mm));
1753                 cond_resched();
1754         }
1755
1756 out:
1757         drm_mm_for_each_node_safe(node, next, &mm)
1758                 drm_mm_remove_node(node);
1759         drm_mm_takedown(&mm);
1760         kfree(order);
1761 err_bitmap:
1762         bitmap_free(bitmap);
1763 err_nodes:
1764         vfree(nodes);
1765 }
1766
1767 static void drm_test_mm_once(struct kunit *test, unsigned int mode)
1768 {
1769         struct drm_mm mm;
1770         struct drm_mm_node rsvd_lo, rsvd_hi, node;
1771
1772         drm_mm_init(&mm, 0, 7);
1773
1774         memset(&rsvd_lo, 0, sizeof(rsvd_lo));
1775         rsvd_lo.start = 1;
1776         rsvd_lo.size = 1;
1777         if (drm_mm_reserve_node(&mm, &rsvd_lo)) {
1778                 KUNIT_FAIL(test, "Could not reserve low node\n");
1779                 goto err;
1780         }
1781
1782         memset(&rsvd_hi, 0, sizeof(rsvd_hi));
1783         rsvd_hi.start = 5;
1784         rsvd_hi.size = 1;
1785         if (drm_mm_reserve_node(&mm, &rsvd_hi)) {
1786                 KUNIT_FAIL(test, "Could not reserve low node\n");
1787                 goto err_lo;
1788         }
1789
1790         if (!drm_mm_hole_follows(&rsvd_lo) || !drm_mm_hole_follows(&rsvd_hi)) {
1791                 KUNIT_FAIL(test, "Expected a hole after lo and high nodes!\n");
1792                 goto err_hi;
1793         }
1794
1795         memset(&node, 0, sizeof(node));
1796         if (drm_mm_insert_node_generic(&mm, &node, 2, 0, 0, mode)) {
1797                 KUNIT_FAIL(test, "Could not insert the node into the available hole!\n");
1798                 goto err_hi;
1799         }
1800
1801         drm_mm_remove_node(&node);
1802 err_hi:
1803         drm_mm_remove_node(&rsvd_hi);
1804 err_lo:
1805         drm_mm_remove_node(&rsvd_lo);
1806 err:
1807         drm_mm_takedown(&mm);
1808 }
1809
1810 static void drm_test_mm_lowest(struct kunit *test)
1811 {
1812         drm_test_mm_once(test, DRM_MM_INSERT_LOW);
1813 }
1814
1815 static void drm_test_mm_highest(struct kunit *test)
1816 {
1817         drm_test_mm_once(test, DRM_MM_INSERT_HIGH);
1818 }
1819
1820 static void separate_adjacent_colors(const struct drm_mm_node *node,
1821                                      unsigned long color, u64 *start, u64 *end)
1822 {
1823         if (drm_mm_node_allocated(node) && node->color != color)
1824                 ++*start;
1825
1826         node = list_next_entry(node, node_list);
1827         if (drm_mm_node_allocated(node) && node->color != color)
1828                 --*end;
1829 }
1830
1831 static bool colors_abutt(struct kunit *test, const struct drm_mm_node *node)
1832 {
1833         if (!drm_mm_hole_follows(node) &&
1834             drm_mm_node_allocated(list_next_entry(node, node_list))) {
1835                 KUNIT_FAIL(test, "colors abutt; %ld [%llx + %llx] is next to %ld [%llx + %llx]!\n",
1836                            node->color, node->start, node->size,
1837                        list_next_entry(node, node_list)->color,
1838                        list_next_entry(node, node_list)->start,
1839                        list_next_entry(node, node_list)->size);
1840                 return true;
1841         }
1842
1843         return false;
1844 }
1845
1846 static void drm_test_mm_color(struct kunit *test)
1847 {
1848         const unsigned int count = min(4096u, max_iterations);
1849         const struct insert_mode *mode;
1850         struct drm_mm mm;
1851         struct drm_mm_node *node, *nn;
1852         unsigned int n;
1853
1854         /* Color adjustment complicates everything. First we just check
1855          * that when we insert a node we apply any color_adjustment callback.
1856          * The callback we use should ensure that there is a gap between
1857          * any two nodes, and so after each insertion we check that those
1858          * holes are inserted and that they are preserved.
1859          */
1860
1861         drm_mm_init(&mm, 0, U64_MAX);
1862
1863         for (n = 1; n <= count; n++) {
1864                 node = kzalloc(sizeof(*node), GFP_KERNEL);
1865                 if (!node)
1866                         goto out;
1867
1868                 if (!expect_insert(test, &mm, node, n, 0, n, &insert_modes[0])) {
1869                         KUNIT_FAIL(test, "insert failed, step %d\n", n);
1870                         kfree(node);
1871                         goto out;
1872                 }
1873         }
1874
1875         drm_mm_for_each_node_safe(node, nn, &mm) {
1876                 if (node->color != node->size) {
1877                         KUNIT_FAIL(test, "invalid color stored: expected %lld, found %ld\n",
1878                                    node->size, node->color);
1879
1880                         goto out;
1881                 }
1882
1883                 drm_mm_remove_node(node);
1884                 kfree(node);
1885         }
1886
1887         /* Now, let's start experimenting with applying a color callback */
1888         mm.color_adjust = separate_adjacent_colors;
1889         for (mode = insert_modes; mode->name; mode++) {
1890                 u64 last;
1891
1892                 node = kzalloc(sizeof(*node), GFP_KERNEL);
1893                 if (!node)
1894                         goto out;
1895
1896                 node->size = 1 + 2 * count;
1897                 node->color = node->size;
1898
1899                 if (drm_mm_reserve_node(&mm, node)) {
1900                         KUNIT_FAIL(test, "initial reserve failed!\n");
1901                         goto out;
1902                 }
1903
1904                 last = node->start + node->size;
1905
1906                 for (n = 1; n <= count; n++) {
1907                         int rem;
1908
1909                         node = kzalloc(sizeof(*node), GFP_KERNEL);
1910                         if (!node)
1911                                 goto out;
1912
1913                         node->start = last;
1914                         node->size = n + count;
1915                         node->color = node->size;
1916
1917                         if (drm_mm_reserve_node(&mm, node) != -ENOSPC) {
1918                                 KUNIT_FAIL(test, "reserve %d did not report color overlap!", n);
1919                                 goto out;
1920                         }
1921
1922                         node->start += n + 1;
1923                         rem = misalignment(node, n + count);
1924                         node->start += n + count - rem;
1925
1926                         if (drm_mm_reserve_node(&mm, node)) {
1927                                 KUNIT_FAIL(test, "reserve %d failed", n);
1928                                 goto out;
1929                         }
1930
1931                         last = node->start + node->size;
1932                 }
1933
1934                 for (n = 1; n <= count; n++) {
1935                         node = kzalloc(sizeof(*node), GFP_KERNEL);
1936                         if (!node)
1937                                 goto out;
1938
1939                         if (!expect_insert(test, &mm, node, n, n, n, mode)) {
1940                                 KUNIT_FAIL(test, "%s insert failed, step %d\n", mode->name, n);
1941                                 kfree(node);
1942                                 goto out;
1943                         }
1944                 }
1945
1946                 drm_mm_for_each_node_safe(node, nn, &mm) {
1947                         u64 rem;
1948
1949                         if (node->color != node->size) {
1950                                 KUNIT_FAIL(test,
1951                                            "%s invalid color stored: expected %lld, found %ld\n",
1952                                            mode->name, node->size, node->color);
1953
1954                                 goto out;
1955                         }
1956
1957                         if (colors_abutt(test, node))
1958                                 goto out;
1959
1960                         div64_u64_rem(node->start, node->size, &rem);
1961                         if (rem) {
1962                                 KUNIT_FAIL(test,
1963                                            "%s colored node misaligned, start=%llx expected alignment=%lld [rem=%lld]\n",
1964                                            mode->name, node->start, node->size, rem);
1965                                 goto out;
1966                         }
1967
1968                         drm_mm_remove_node(node);
1969                         kfree(node);
1970                 }
1971
1972                 cond_resched();
1973         }
1974
1975 out:
1976         drm_mm_for_each_node_safe(node, nn, &mm) {
1977                 drm_mm_remove_node(node);
1978                 kfree(node);
1979         }
1980         drm_mm_takedown(&mm);
1981 }
1982
1983 static int evict_color(struct kunit *test, struct drm_mm *mm, u64 range_start,
1984                        u64 range_end, struct evict_node *nodes, unsigned int *order,
1985                 unsigned int count, unsigned int size, unsigned int alignment,
1986                 unsigned long color, const struct insert_mode *mode)
1987 {
1988         struct drm_mm_scan scan;
1989         LIST_HEAD(evict_list);
1990         struct evict_node *e;
1991         struct drm_mm_node tmp;
1992         int err;
1993
1994         drm_mm_scan_init_with_range(&scan, mm, size, alignment, color, range_start,
1995                                     range_end, mode->mode);
1996         if (!evict_nodes(test, &scan, nodes, order, count, true, &evict_list))
1997                 return -EINVAL;
1998
1999         memset(&tmp, 0, sizeof(tmp));
2000         err = drm_mm_insert_node_generic(mm, &tmp, size, alignment, color,
2001                                          DRM_MM_INSERT_EVICT);
2002         if (err) {
2003                 KUNIT_FAIL(test,
2004                            "Failed to insert into eviction hole: size=%d, align=%d, color=%lu, err=%d\n",
2005                            size, alignment, color, err);
2006                 show_scan(test, &scan);
2007                 show_holes(test, mm, 3);
2008                 return err;
2009         }
2010
2011         if (tmp.start < range_start || tmp.start + tmp.size > range_end) {
2012                 KUNIT_FAIL(test,
2013                            "Inserted [address=%llu + %llu] did not fit into the request range [%llu, %llu]\n",
2014                            tmp.start, tmp.size, range_start, range_end);
2015                 err = -EINVAL;
2016         }
2017
2018         if (colors_abutt(test, &tmp))
2019                 err = -EINVAL;
2020
2021         if (!assert_node(test, &tmp, mm, size, alignment, color)) {
2022                 KUNIT_FAIL(test,
2023                            "Inserted did not fit the eviction hole: size=%lld [%d], align=%d [rem=%lld], start=%llx\n",
2024                            tmp.size, size, alignment, misalignment(&tmp, alignment), tmp.start);
2025                 err = -EINVAL;
2026         }
2027
2028         drm_mm_remove_node(&tmp);
2029         if (err)
2030                 return err;
2031
2032         list_for_each_entry(e, &evict_list, link) {
2033                 err = drm_mm_reserve_node(mm, &e->node);
2034                 if (err) {
2035                         KUNIT_FAIL(test, "Failed to reinsert node after eviction: start=%llx\n",
2036                                    e->node.start);
2037                         return err;
2038                 }
2039         }
2040
2041         cond_resched();
2042         return 0;
2043 }
2044
2045 static void drm_test_mm_color_evict(struct kunit *test)
2046 {
2047         DRM_RND_STATE(prng, random_seed);
2048         const unsigned int total_size = min(8192u, max_iterations);
2049         const struct insert_mode *mode;
2050         unsigned long color = 0;
2051         struct drm_mm mm;
2052         struct evict_node *nodes;
2053         struct drm_mm_node *node, *next;
2054         unsigned int *order, n;
2055
2056         /* Check that the drm_mm_scan also honours color adjustment when
2057          * choosing its victims to create a hole. Our color_adjust does not
2058          * allow two nodes to be placed together without an intervening hole
2059          * enlarging the set of victims that must be evicted.
2060          */
2061
2062         nodes = vzalloc(array_size(total_size, sizeof(*nodes)));
2063         KUNIT_ASSERT_TRUE(test, nodes);
2064
2065         order = drm_random_order(total_size, &prng);
2066         if (!order)
2067                 goto err_nodes;
2068
2069         drm_mm_init(&mm, 0, 2 * total_size - 1);
2070         mm.color_adjust = separate_adjacent_colors;
2071         for (n = 0; n < total_size; n++) {
2072                 if (!expect_insert(test, &mm, &nodes[n].node,
2073                                    1, 0, color++,
2074                                    &insert_modes[0])) {
2075                         KUNIT_FAIL(test, "insert failed, step %d\n", n);
2076                         goto out;
2077                 }
2078         }
2079
2080         for (mode = evict_modes; mode->name; mode++) {
2081                 for (n = 1; n <= total_size; n <<= 1) {
2082                         drm_random_reorder(order, total_size, &prng);
2083                         if (evict_color(test, &mm, 0, U64_MAX, nodes, order, total_size,
2084                                         n, 1, color++, mode)) {
2085                                 KUNIT_FAIL(test, "%s evict_color(size=%u) failed\n", mode->name, n);
2086                                 goto out;
2087                         }
2088                 }
2089
2090                 for (n = 1; n < total_size; n <<= 1) {
2091                         drm_random_reorder(order, total_size, &prng);
2092                         if (evict_color(test, &mm, 0, U64_MAX, nodes, order, total_size,
2093                                         total_size / 2, n, color++, mode)) {
2094                                 KUNIT_FAIL(test, "%s evict_color(size=%u, alignment=%u) failed\n",
2095                                            mode->name, total_size / 2, n);
2096                                 goto out;
2097                         }
2098                 }
2099
2100                 for_each_prime_number_from(n, 1, min(total_size, max_prime)) {
2101                         unsigned int nsize = (total_size - n + 1) / 2;
2102
2103                         DRM_MM_BUG_ON(!nsize);
2104
2105                         drm_random_reorder(order, total_size, &prng);
2106                         if (evict_color(test, &mm, 0, U64_MAX, nodes, order, total_size,
2107                                         nsize, n, color++, mode)) {
2108                                 KUNIT_FAIL(test, "%s evict_color(size=%u, alignment=%u) failed\n",
2109                                            mode->name, nsize, n);
2110                                 goto out;
2111                         }
2112                 }
2113
2114                 cond_resched();
2115         }
2116
2117 out:
2118         drm_mm_for_each_node_safe(node, next, &mm)
2119                 drm_mm_remove_node(node);
2120         drm_mm_takedown(&mm);
2121         kfree(order);
2122 err_nodes:
2123         vfree(nodes);
2124 }
2125
2126 static void drm_test_mm_color_evict_range(struct kunit *test)
2127 {
2128         DRM_RND_STATE(prng, random_seed);
2129         const unsigned int total_size = 8192;
2130         const unsigned int range_size = total_size / 2;
2131         const unsigned int range_start = total_size / 4;
2132         const unsigned int range_end = range_start + range_size;
2133         const struct insert_mode *mode;
2134         unsigned long color = 0;
2135         struct drm_mm mm;
2136         struct evict_node *nodes;
2137         struct drm_mm_node *node, *next;
2138         unsigned int *order, n;
2139
2140         /* Like drm_test_mm_color_evict(), but limited to small portion of the full
2141          * drm_mm range.
2142          */
2143
2144         nodes = vzalloc(array_size(total_size, sizeof(*nodes)));
2145         KUNIT_ASSERT_TRUE(test, nodes);
2146
2147         order = drm_random_order(total_size, &prng);
2148         if (!order)
2149                 goto err_nodes;
2150
2151         drm_mm_init(&mm, 0, 2 * total_size - 1);
2152         mm.color_adjust = separate_adjacent_colors;
2153         for (n = 0; n < total_size; n++) {
2154                 if (!expect_insert(test, &mm, &nodes[n].node,
2155                                    1, 0, color++,
2156                                    &insert_modes[0])) {
2157                         KUNIT_FAIL(test, "insert failed, step %d\n", n);
2158                         goto out;
2159                 }
2160         }
2161
2162         for (mode = evict_modes; mode->name; mode++) {
2163                 for (n = 1; n <= range_size; n <<= 1) {
2164                         drm_random_reorder(order, range_size, &prng);
2165                         if (evict_color(test, &mm, range_start, range_end, nodes, order,
2166                                         total_size, n, 1, color++, mode)) {
2167                                 KUNIT_FAIL(test,
2168                                            "%s evict_color(size=%u) failed for range [%x, %x]\n",
2169                                                 mode->name, n, range_start, range_end);
2170                                 goto out;
2171                         }
2172                 }
2173
2174                 for (n = 1; n < range_size; n <<= 1) {
2175                         drm_random_reorder(order, total_size, &prng);
2176                         if (evict_color(test, &mm, range_start, range_end, nodes, order,
2177                                         total_size, range_size / 2, n, color++, mode)) {
2178                                 KUNIT_FAIL(test,
2179                                            "%s evict_color(size=%u, alignment=%u) failed for range [%x, %x]\n",
2180                                            mode->name, total_size / 2, n, range_start, range_end);
2181                                 goto out;
2182                         }
2183                 }
2184
2185                 for_each_prime_number_from(n, 1, min(range_size, max_prime)) {
2186                         unsigned int nsize = (range_size - n + 1) / 2;
2187
2188                         DRM_MM_BUG_ON(!nsize);
2189
2190                         drm_random_reorder(order, total_size, &prng);
2191                         if (evict_color(test, &mm, range_start, range_end, nodes, order,
2192                                         total_size, nsize, n, color++, mode)) {
2193                                 KUNIT_FAIL(test,
2194                                            "%s evict_color(size=%u, alignment=%u) failed for range [%x, %x]\n",
2195                                            mode->name, nsize, n, range_start, range_end);
2196                                 goto out;
2197                         }
2198                 }
2199
2200                 cond_resched();
2201         }
2202
2203 out:
2204         drm_mm_for_each_node_safe(node, next, &mm)
2205                 drm_mm_remove_node(node);
2206         drm_mm_takedown(&mm);
2207         kfree(order);
2208 err_nodes:
2209         vfree(nodes);
2210 }
2211
2212 static int drm_mm_suite_init(struct kunit_suite *suite)
2213 {
2214         while (!random_seed)
2215                 random_seed = get_random_u32();
2216
2217         kunit_info(suite,
2218                    "Testing DRM range manager, with random_seed=0x%x max_iterations=%u max_prime=%u\n",
2219                    random_seed, max_iterations, max_prime);
2220
2221         return 0;
2222 }
2223
2224 module_param(random_seed, uint, 0400);
2225 module_param(max_iterations, uint, 0400);
2226 module_param(max_prime, uint, 0400);
2227
2228 static struct kunit_case drm_mm_tests[] = {
2229         KUNIT_CASE(drm_test_mm_init),
2230         KUNIT_CASE(drm_test_mm_debug),
2231         KUNIT_CASE(drm_test_mm_reserve),
2232         KUNIT_CASE(drm_test_mm_insert),
2233         KUNIT_CASE(drm_test_mm_replace),
2234         KUNIT_CASE(drm_test_mm_insert_range),
2235         KUNIT_CASE(drm_test_mm_frag),
2236         KUNIT_CASE(drm_test_mm_align),
2237         KUNIT_CASE(drm_test_mm_align32),
2238         KUNIT_CASE(drm_test_mm_align64),
2239         KUNIT_CASE(drm_test_mm_evict),
2240         KUNIT_CASE(drm_test_mm_evict_range),
2241         KUNIT_CASE(drm_test_mm_topdown),
2242         KUNIT_CASE(drm_test_mm_bottomup),
2243         KUNIT_CASE(drm_test_mm_lowest),
2244         KUNIT_CASE(drm_test_mm_highest),
2245         KUNIT_CASE(drm_test_mm_color),
2246         KUNIT_CASE(drm_test_mm_color_evict),
2247         KUNIT_CASE(drm_test_mm_color_evict_range),
2248         {}
2249 };
2250
2251 static struct kunit_suite drm_mm_test_suite = {
2252         .name = "drm_mm",
2253         .suite_init = drm_mm_suite_init,
2254         .test_cases = drm_mm_tests,
2255 };
2256
2257 kunit_test_suite(drm_mm_test_suite);
2258
2259 MODULE_AUTHOR("Intel Corporation");
2260 MODULE_LICENSE("GPL");