drivers/gpu/drm/i915/selftests/i915_gem_evict.c

   1 /*
   2  * Copyright © 2016 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include "gem/i915_gem_pm.h"
  26 #include "gem/selftests/igt_gem_utils.h"
  27 #include "gem/selftests/mock_context.h"
  28 #include "gt/intel_gt.h"
  29
  30 #include "i915_selftest.h"
  31
  32 #include "igt_flush_test.h"
  33 #include "lib_sw_fence.h"
  34 #include "mock_drm.h"
  35 #include "mock_gem_device.h"
  36
  37 static void quirk_add(struct drm_i915_gem_object *obj,
  38                       struct list_head *objects)
  39 {
  40         /* quirk is only for live tiled objects, use it to declare ownership */
  41         GEM_BUG_ON(obj->mm.quirked);
  42         obj->mm.quirked = true;
  43         list_add(&obj->st_link, objects);
  44 }
  45
  46 static int populate_ggtt(struct i915_ggtt *ggtt, struct list_head *objects)
  47 {
  48         struct drm_i915_gem_object *obj;
  49         unsigned long count;
  50
  51         count = 0;
  52         do {
  53                 struct i915_vma *vma;
  54
  55                 obj = i915_gem_object_create_internal(ggtt->vm.i915,
  56                                                       I915_GTT_PAGE_SIZE);
  57                 if (IS_ERR(obj))
  58                         return PTR_ERR(obj);
  59
  60                 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
  61                 if (IS_ERR(vma)) {
  62                         i915_gem_object_put(obj);
  63                         if (vma == ERR_PTR(-ENOSPC))
  64                                 break;
  65
  66                         return PTR_ERR(vma);
  67                 }
  68
  69                 quirk_add(obj, objects);
  70                 count++;
  71         } while (1);
  72         pr_debug("Filled GGTT with %lu pages [%llu total]\n",
  73                  count, ggtt->vm.total / PAGE_SIZE);
  74
  75         if (list_empty(&ggtt->vm.bound_list)) {
  76                 pr_err("No objects on the GGTT inactive list!\n");
  77                 return -EINVAL;
  78         }
  79
  80         return 0;
  81 }
  82
  83 static void unpin_ggtt(struct i915_ggtt *ggtt)
  84 {
  85         struct i915_vma *vma;
  86
  87         list_for_each_entry(vma, &ggtt->vm.bound_list, vm_link)
  88                 if (vma->obj->mm.quirked)
  89                         i915_vma_unpin(vma);
  90 }
  91
  92 static void cleanup_objects(struct i915_ggtt *ggtt, struct list_head *list)
  93 {
  94         struct drm_i915_gem_object *obj, *on;
  95
  96         list_for_each_entry_safe(obj, on, list, st_link) {
  97                 GEM_BUG_ON(!obj->mm.quirked);
  98                 obj->mm.quirked = false;
  99                 i915_gem_object_put(obj);
 100         }
 101
 102         i915_gem_drain_freed_objects(ggtt->vm.i915);
 103 }
 104
 105 static int igt_evict_something(void *arg)
 106 {
 107         struct intel_gt *gt = arg;
 108         struct i915_ggtt *ggtt = gt->ggtt;
 109         LIST_HEAD(objects);
 110         int err;
 111
 112         /* Fill the GGTT with pinned objects and try to evict one. */
 113
 114         err = populate_ggtt(ggtt, &objects);
 115         if (err)
 116                 goto cleanup;
 117
 118         /* Everything is pinned, nothing should happen */
 119         mutex_lock(&ggtt->vm.mutex);
 120         err = i915_gem_evict_something(&ggtt->vm,
 121                                        I915_GTT_PAGE_SIZE, 0, 0,
 122                                        0, U64_MAX,
 123                                        0);
 124         mutex_unlock(&ggtt->vm.mutex);
 125         if (err != -ENOSPC) {
 126                 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
 127                        err);
 128                 goto cleanup;
 129         }
 130
 131         unpin_ggtt(ggtt);
 132
 133         /* Everything is unpinned, we should be able to evict something */
 134         mutex_lock(&ggtt->vm.mutex);
 135         err = i915_gem_evict_something(&ggtt->vm,
 136                                        I915_GTT_PAGE_SIZE, 0, 0,
 137                                        0, U64_MAX,
 138                                        0);
 139         mutex_unlock(&ggtt->vm.mutex);
 140         if (err) {
 141                 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
 142                        err);
 143                 goto cleanup;
 144         }
 145
 146 cleanup:
 147         cleanup_objects(ggtt, &objects);
 148         return err;
 149 }
 150
 151 static int igt_overcommit(void *arg)
 152 {
 153         struct intel_gt *gt = arg;
 154         struct i915_ggtt *ggtt = gt->ggtt;
 155         struct drm_i915_gem_object *obj;
 156         struct i915_vma *vma;
 157         LIST_HEAD(objects);
 158         int err;
 159
 160         /* Fill the GGTT with pinned objects and then try to pin one more.
 161          * We expect it to fail.
 162          */
 163
 164         err = populate_ggtt(ggtt, &objects);
 165         if (err)
 166                 goto cleanup;
 167
 168         obj = i915_gem_object_create_internal(gt->i915, I915_GTT_PAGE_SIZE);
 169         if (IS_ERR(obj)) {
 170                 err = PTR_ERR(obj);
 171                 goto cleanup;
 172         }
 173
 174         quirk_add(obj, &objects);
 175
 176         vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
 177         if (vma != ERR_PTR(-ENOSPC)) {
 178                 pr_err("Failed to evict+insert, i915_gem_object_ggtt_pin returned err=%d\n", (int)PTR_ERR_OR_ZERO(vma));
 179                 err = -EINVAL;
 180                 goto cleanup;
 181         }
 182
 183 cleanup:
 184         cleanup_objects(ggtt, &objects);
 185         return err;
 186 }
 187
 188 static int igt_evict_for_vma(void *arg)
 189 {
 190         struct intel_gt *gt = arg;
 191         struct i915_ggtt *ggtt = gt->ggtt;
 192         struct drm_mm_node target = {
 193                 .start = 0,
 194                 .size = 4096,
 195         };
 196         LIST_HEAD(objects);
 197         int err;
 198
 199         /* Fill the GGTT with pinned objects and try to evict a range. */
 200
 201         err = populate_ggtt(ggtt, &objects);
 202         if (err)
 203                 goto cleanup;
 204
 205         /* Everything is pinned, nothing should happen */
 206         mutex_lock(&ggtt->vm.mutex);
 207         err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
 208         mutex_unlock(&ggtt->vm.mutex);
 209         if (err != -ENOSPC) {
 210                 pr_err("i915_gem_evict_for_node on a full GGTT returned err=%d\n",
 211                        err);
 212                 goto cleanup;
 213         }
 214
 215         unpin_ggtt(ggtt);
 216
 217         /* Everything is unpinned, we should be able to evict the node */
 218         mutex_lock(&ggtt->vm.mutex);
 219         err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
 220         mutex_unlock(&ggtt->vm.mutex);
 221         if (err) {
 222                 pr_err("i915_gem_evict_for_node returned err=%d\n",
 223                        err);
 224                 goto cleanup;
 225         }
 226
 227 cleanup:
 228         cleanup_objects(ggtt, &objects);
 229         return err;
 230 }
 231
 232 static void mock_color_adjust(const struct drm_mm_node *node,
 233                               unsigned long color,
 234                               u64 *start,
 235                               u64 *end)
 236 {
 237 }
 238
 239 static int igt_evict_for_cache_color(void *arg)
 240 {
 241         struct intel_gt *gt = arg;
 242         struct i915_ggtt *ggtt = gt->ggtt;
 243         const unsigned long flags = PIN_OFFSET_FIXED;
 244         struct drm_mm_node target = {
 245                 .start = I915_GTT_PAGE_SIZE * 2,
 246                 .size = I915_GTT_PAGE_SIZE,
 247                 .color = I915_CACHE_LLC,
 248         };
 249         struct drm_i915_gem_object *obj;
 250         struct i915_vma *vma;
 251         LIST_HEAD(objects);
 252         int err;
 253
 254         /*
 255          * Currently the use of color_adjust for the GGTT is limited to cache
 256          * coloring and guard pages, and so the presence of mm.color_adjust for
 257          * the GGTT is assumed to be i915_ggtt_color_adjust, hence using a mock
 258          * color adjust will work just fine for our purposes.
 259          */
 260         ggtt->vm.mm.color_adjust = mock_color_adjust;
 261         GEM_BUG_ON(!i915_vm_has_cache_coloring(&ggtt->vm));
 262
 263         obj = i915_gem_object_create_internal(gt->i915, I915_GTT_PAGE_SIZE);
 264         if (IS_ERR(obj)) {
 265                 err = PTR_ERR(obj);
 266                 goto cleanup;
 267         }
 268         i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC);
 269         quirk_add(obj, &objects);
 270
 271         vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
 272                                        I915_GTT_PAGE_SIZE | flags);
 273         if (IS_ERR(vma)) {
 274                 pr_err("[0]i915_gem_object_ggtt_pin failed\n");
 275                 err = PTR_ERR(vma);
 276                 goto cleanup;
 277         }
 278
 279         obj = i915_gem_object_create_internal(gt->i915, I915_GTT_PAGE_SIZE);
 280         if (IS_ERR(obj)) {
 281                 err = PTR_ERR(obj);
 282                 goto cleanup;
 283         }
 284         i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC);
 285         quirk_add(obj, &objects);
 286
 287         /* Neighbouring; same colour - should fit */
 288         vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
 289                                        (I915_GTT_PAGE_SIZE * 2) | flags);
 290         if (IS_ERR(vma)) {
 291                 pr_err("[1]i915_gem_object_ggtt_pin failed\n");
 292                 err = PTR_ERR(vma);
 293                 goto cleanup;
 294         }
 295
 296         i915_vma_unpin(vma);
 297
 298         /* Remove just the second vma */
 299         mutex_lock(&ggtt->vm.mutex);
 300         err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
 301         mutex_unlock(&ggtt->vm.mutex);
 302         if (err) {
 303                 pr_err("[0]i915_gem_evict_for_node returned err=%d\n", err);
 304                 goto cleanup;
 305         }
 306
 307         /* Attempt to remove the first *pinned* vma, by removing the (empty)
 308          * neighbour -- this should fail.
 309          */
 310         target.color = I915_CACHE_L3_LLC;
 311
 312         mutex_lock(&ggtt->vm.mutex);
 313         err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
 314         mutex_unlock(&ggtt->vm.mutex);
 315         if (!err) {
 316                 pr_err("[1]i915_gem_evict_for_node returned err=%d\n", err);
 317                 err = -EINVAL;
 318                 goto cleanup;
 319         }
 320
 321         err = 0;
 322
 323 cleanup:
 324         unpin_ggtt(ggtt);
 325         cleanup_objects(ggtt, &objects);
 326         ggtt->vm.mm.color_adjust = NULL;
 327         return err;
 328 }
 329
 330 static int igt_evict_vm(void *arg)
 331 {
 332         struct intel_gt *gt = arg;
 333         struct i915_ggtt *ggtt = gt->ggtt;
 334         LIST_HEAD(objects);
 335         int err;
 336
 337         /* Fill the GGTT with pinned objects and try to evict everything. */
 338
 339         err = populate_ggtt(ggtt, &objects);
 340         if (err)
 341                 goto cleanup;
 342
 343         /* Everything is pinned, nothing should happen */
 344         mutex_lock(&ggtt->vm.mutex);
 345         err = i915_gem_evict_vm(&ggtt->vm);
 346         mutex_unlock(&ggtt->vm.mutex);
 347         if (err) {
 348                 pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
 349                        err);
 350                 goto cleanup;
 351         }
 352
 353         unpin_ggtt(ggtt);
 354
 355         mutex_lock(&ggtt->vm.mutex);
 356         err = i915_gem_evict_vm(&ggtt->vm);
 357         mutex_unlock(&ggtt->vm.mutex);
 358         if (err) {
 359                 pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
 360                        err);
 361                 goto cleanup;
 362         }
 363
 364 cleanup:
 365         cleanup_objects(ggtt, &objects);
 366         return err;
 367 }
 368
 369 static int igt_evict_contexts(void *arg)
 370 {
 371         const u64 PRETEND_GGTT_SIZE = 16ull << 20;
 372         struct intel_gt *gt = arg;
 373         struct i915_ggtt *ggtt = gt->ggtt;
 374         struct drm_i915_private *i915 = gt->i915;
 375         struct intel_engine_cs *engine;
 376         enum intel_engine_id id;
 377         struct reserved {
 378                 struct drm_mm_node node;
 379                 struct reserved *next;
 380         } *reserved = NULL;
 381         intel_wakeref_t wakeref;
 382         struct drm_mm_node hole;
 383         unsigned long count;
 384         int err;
 385
 386         /*
 387          * The purpose of this test is to verify that we will trigger an
 388          * eviction in the GGTT when constructing a request that requires
 389          * additional space in the GGTT for pinning the context. This space
 390          * is not directly tied to the request so reclaiming it requires
 391          * extra work.
 392          *
 393          * As such this test is only meaningful for full-ppgtt environments
 394          * where the GTT space of the request is separate from the GGTT
 395          * allocation required to build the request.
 396          */
 397         if (!HAS_FULL_PPGTT(i915))
 398                 return 0;
 399
 400         wakeref = intel_runtime_pm_get(&i915->runtime_pm);
 401
 402         /* Reserve a block so that we know we have enough to fit a few rq */
 403         memset(&hole, 0, sizeof(hole));
 404         mutex_lock(&ggtt->vm.mutex);
 405         err = i915_gem_gtt_insert(&ggtt->vm, &hole,
 406                                   PRETEND_GGTT_SIZE, 0, I915_COLOR_UNEVICTABLE,
 407                                   0, ggtt->vm.total,
 408                                   PIN_NOEVICT);
 409         if (err)
 410                 goto out_locked;
 411
 412         /* Make the GGTT appear small by filling it with unevictable nodes */
 413         count = 0;
 414         do {
 415                 struct reserved *r;
 416
 417                 mutex_unlock(&ggtt->vm.mutex);
 418                 r = kcalloc(1, sizeof(*r), GFP_KERNEL);
 419                 mutex_lock(&ggtt->vm.mutex);
 420                 if (!r) {
 421                         err = -ENOMEM;
 422                         goto out_locked;
 423                 }
 424
 425                 if (i915_gem_gtt_insert(&ggtt->vm, &r->node,
 426                                         1ul << 20, 0, I915_COLOR_UNEVICTABLE,
 427                                         0, ggtt->vm.total,
 428                                         PIN_NOEVICT)) {
 429                         kfree(r);
 430                         break;
 431                 }
 432
 433                 r->next = reserved;
 434                 reserved = r;
 435
 436                 count++;
 437         } while (1);
 438         drm_mm_remove_node(&hole);
 439         mutex_unlock(&ggtt->vm.mutex);
 440         pr_info("Filled GGTT with %lu 1MiB nodes\n", count);
 441
 442         /* Overfill the GGTT with context objects and so try to evict one. */
 443         for_each_engine(engine, gt, id) {
 444                 struct i915_sw_fence fence;
 445                 struct file *file;
 446
 447                 file = mock_file(i915);
 448                 if (IS_ERR(file)) {
 449                         err = PTR_ERR(file);
 450                         break;
 451                 }
 452
 453                 count = 0;
 454                 onstack_fence_init(&fence);
 455                 do {
 456                         struct i915_request *rq;
 457                         struct i915_gem_context *ctx;
 458
 459                         ctx = live_context(i915, file);
 460                         if (IS_ERR(ctx))
 461                                 break;
 462
 463                         /* We will need some GGTT space for the rq's context */
 464                         igt_evict_ctl.fail_if_busy = true;
 465                         rq = igt_request_alloc(ctx, engine);
 466                         igt_evict_ctl.fail_if_busy = false;
 467
 468                         if (IS_ERR(rq)) {
 469                                 /* When full, fail_if_busy will trigger EBUSY */
 470                                 if (PTR_ERR(rq) != -EBUSY) {
 471                                         pr_err("Unexpected error from request alloc (on %s): %d\n",
 472                                                engine->name,
 473                                                (int)PTR_ERR(rq));
 474                                         err = PTR_ERR(rq);
 475                                 }
 476                                 break;
 477                         }
 478
 479                         /* Keep every request/ctx pinned until we are full */
 480                         err = i915_sw_fence_await_sw_fence_gfp(&rq->submit,
 481                                                                &fence,
 482                                                                GFP_KERNEL);
 483                         if (err < 0)
 484                                 break;
 485
 486                         i915_request_add(rq);
 487                         count++;
 488                         err = 0;
 489                 } while(1);
 490                 onstack_fence_fini(&fence);
 491                 pr_info("Submitted %lu contexts/requests on %s\n",
 492                         count, engine->name);
 493
 494                 fput(file);
 495                 if (err)
 496                         break;
 497         }
 498
 499         mutex_lock(&ggtt->vm.mutex);
 500 out_locked:
 501         if (igt_flush_test(i915))
 502                 err = -EIO;
 503         while (reserved) {
 504                 struct reserved *next = reserved->next;
 505
 506                 drm_mm_remove_node(&reserved->node);
 507                 kfree(reserved);
 508
 509                 reserved = next;
 510         }
 511         if (drm_mm_node_allocated(&hole))
 512                 drm_mm_remove_node(&hole);
 513         mutex_unlock(&ggtt->vm.mutex);
 514         intel_runtime_pm_put(&i915->runtime_pm, wakeref);
 515
 516         return err;
 517 }
 518
 519 int i915_gem_evict_mock_selftests(void)
 520 {
 521         static const struct i915_subtest tests[] = {
 522                 SUBTEST(igt_evict_something),
 523                 SUBTEST(igt_evict_for_vma),
 524                 SUBTEST(igt_evict_for_cache_color),
 525                 SUBTEST(igt_evict_vm),
 526                 SUBTEST(igt_overcommit),
 527         };
 528         struct drm_i915_private *i915;
 529         intel_wakeref_t wakeref;
 530         int err = 0;
 531
 532         i915 = mock_gem_device();
 533         if (!i915)
 534                 return -ENOMEM;
 535
 536         with_intel_runtime_pm(&i915->runtime_pm, wakeref)
 537                 err = i915_subtests(tests, &i915->gt);
 538
 539         mock_destroy_device(i915);
 540         return err;
 541 }
 542
 543 int i915_gem_evict_live_selftests(struct drm_i915_private *i915)
 544 {
 545         static const struct i915_subtest tests[] = {
 546                 SUBTEST(igt_evict_contexts),
 547         };
 548
 549         if (intel_gt_is_wedged(&i915->gt))
 550                 return 0;
 551
 552         return intel_gt_live_subtests(tests, &i915->gt);
 553 }