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 unsigned long unbound, bound, count; 49 struct drm_i915_gem_object *obj; 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 bound = 0; 76 unbound = 0; 77 list_for_each_entry(obj, objects, st_link) { 78 GEM_BUG_ON(!obj->mm.quirked); 79 80 if (atomic_read(&obj->bind_count)) 81 bound++; 82 else 83 unbound++; 84 } 85 GEM_BUG_ON(bound + unbound != count); 86 87 if (unbound) { 88 pr_err("%s: Found %lu objects unbound, expected %u!\n", 89 __func__, unbound, 0); 90 return -EINVAL; 91 } 92 93 if (bound != count) { 94 pr_err("%s: Found %lu objects bound, expected %lu!\n", 95 __func__, bound, count); 96 return -EINVAL; 97 } 98 99 if (list_empty(&ggtt->vm.bound_list)) { 100 pr_err("No objects on the GGTT inactive list!\n"); 101 return -EINVAL; 102 } 103 104 return 0; 105 } 106 107 static void unpin_ggtt(struct i915_ggtt *ggtt) 108 { 109 struct i915_vma *vma; 110 111 list_for_each_entry(vma, &ggtt->vm.bound_list, vm_link) 112 if (vma->obj->mm.quirked) 113 i915_vma_unpin(vma); 114 } 115 116 static void cleanup_objects(struct i915_ggtt *ggtt, struct list_head *list) 117 { 118 struct drm_i915_gem_object *obj, *on; 119 120 list_for_each_entry_safe(obj, on, list, st_link) { 121 GEM_BUG_ON(!obj->mm.quirked); 122 obj->mm.quirked = false; 123 i915_gem_object_put(obj); 124 } 125 126 i915_gem_drain_freed_objects(ggtt->vm.i915); 127 } 128 129 static int igt_evict_something(void *arg) 130 { 131 struct intel_gt *gt = arg; 132 struct i915_ggtt *ggtt = gt->ggtt; 133 LIST_HEAD(objects); 134 int err; 135 136 /* Fill the GGTT with pinned objects and try to evict one. */ 137 138 err = populate_ggtt(ggtt, &objects); 139 if (err) 140 goto cleanup; 141 142 /* Everything is pinned, nothing should happen */ 143 mutex_lock(&ggtt->vm.mutex); 144 err = i915_gem_evict_something(&ggtt->vm, 145 I915_GTT_PAGE_SIZE, 0, 0, 146 0, U64_MAX, 147 0); 148 mutex_unlock(&ggtt->vm.mutex); 149 if (err != -ENOSPC) { 150 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n", 151 err); 152 goto cleanup; 153 } 154 155 unpin_ggtt(ggtt); 156 157 /* Everything is unpinned, we should be able to evict something */ 158 mutex_lock(&ggtt->vm.mutex); 159 err = i915_gem_evict_something(&ggtt->vm, 160 I915_GTT_PAGE_SIZE, 0, 0, 161 0, U64_MAX, 162 0); 163 mutex_unlock(&ggtt->vm.mutex); 164 if (err) { 165 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n", 166 err); 167 goto cleanup; 168 } 169 170 cleanup: 171 cleanup_objects(ggtt, &objects); 172 return err; 173 } 174 175 static int igt_overcommit(void *arg) 176 { 177 struct intel_gt *gt = arg; 178 struct i915_ggtt *ggtt = gt->ggtt; 179 struct drm_i915_gem_object *obj; 180 struct i915_vma *vma; 181 LIST_HEAD(objects); 182 int err; 183 184 /* Fill the GGTT with pinned objects and then try to pin one more. 185 * We expect it to fail. 186 */ 187 188 err = populate_ggtt(ggtt, &objects); 189 if (err) 190 goto cleanup; 191 192 obj = i915_gem_object_create_internal(gt->i915, I915_GTT_PAGE_SIZE); 193 if (IS_ERR(obj)) { 194 err = PTR_ERR(obj); 195 goto cleanup; 196 } 197 198 quirk_add(obj, &objects); 199 200 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0); 201 if (!IS_ERR(vma) || PTR_ERR(vma) != -ENOSPC) { 202 pr_err("Failed to evict+insert, i915_gem_object_ggtt_pin returned err=%d\n", (int)PTR_ERR(vma)); 203 err = -EINVAL; 204 goto cleanup; 205 } 206 207 cleanup: 208 cleanup_objects(ggtt, &objects); 209 return err; 210 } 211 212 static int igt_evict_for_vma(void *arg) 213 { 214 struct intel_gt *gt = arg; 215 struct i915_ggtt *ggtt = gt->ggtt; 216 struct drm_mm_node target = { 217 .start = 0, 218 .size = 4096, 219 }; 220 LIST_HEAD(objects); 221 int err; 222 223 /* Fill the GGTT with pinned objects and try to evict a range. */ 224 225 err = populate_ggtt(ggtt, &objects); 226 if (err) 227 goto cleanup; 228 229 /* Everything is pinned, nothing should happen */ 230 mutex_lock(&ggtt->vm.mutex); 231 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 232 mutex_unlock(&ggtt->vm.mutex); 233 if (err != -ENOSPC) { 234 pr_err("i915_gem_evict_for_node on a full GGTT returned err=%d\n", 235 err); 236 goto cleanup; 237 } 238 239 unpin_ggtt(ggtt); 240 241 /* Everything is unpinned, we should be able to evict the node */ 242 mutex_lock(&ggtt->vm.mutex); 243 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 244 mutex_unlock(&ggtt->vm.mutex); 245 if (err) { 246 pr_err("i915_gem_evict_for_node returned err=%d\n", 247 err); 248 goto cleanup; 249 } 250 251 cleanup: 252 cleanup_objects(ggtt, &objects); 253 return err; 254 } 255 256 static void mock_color_adjust(const struct drm_mm_node *node, 257 unsigned long color, 258 u64 *start, 259 u64 *end) 260 { 261 } 262 263 static int igt_evict_for_cache_color(void *arg) 264 { 265 struct intel_gt *gt = arg; 266 struct i915_ggtt *ggtt = gt->ggtt; 267 const unsigned long flags = PIN_OFFSET_FIXED; 268 struct drm_mm_node target = { 269 .start = I915_GTT_PAGE_SIZE * 2, 270 .size = I915_GTT_PAGE_SIZE, 271 .color = I915_CACHE_LLC, 272 }; 273 struct drm_i915_gem_object *obj; 274 struct i915_vma *vma; 275 LIST_HEAD(objects); 276 int err; 277 278 /* 279 * Currently the use of color_adjust for the GGTT is limited to cache 280 * coloring and guard pages, and so the presence of mm.color_adjust for 281 * the GGTT is assumed to be i915_ggtt_color_adjust, hence using a mock 282 * color adjust will work just fine for our purposes. 283 */ 284 ggtt->vm.mm.color_adjust = mock_color_adjust; 285 GEM_BUG_ON(!i915_vm_has_cache_coloring(&ggtt->vm)); 286 287 obj = i915_gem_object_create_internal(gt->i915, I915_GTT_PAGE_SIZE); 288 if (IS_ERR(obj)) { 289 err = PTR_ERR(obj); 290 goto cleanup; 291 } 292 i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC); 293 quirk_add(obj, &objects); 294 295 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 296 I915_GTT_PAGE_SIZE | flags); 297 if (IS_ERR(vma)) { 298 pr_err("[0]i915_gem_object_ggtt_pin failed\n"); 299 err = PTR_ERR(vma); 300 goto cleanup; 301 } 302 303 obj = i915_gem_object_create_internal(gt->i915, I915_GTT_PAGE_SIZE); 304 if (IS_ERR(obj)) { 305 err = PTR_ERR(obj); 306 goto cleanup; 307 } 308 i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC); 309 quirk_add(obj, &objects); 310 311 /* Neighbouring; same colour - should fit */ 312 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 313 (I915_GTT_PAGE_SIZE * 2) | flags); 314 if (IS_ERR(vma)) { 315 pr_err("[1]i915_gem_object_ggtt_pin failed\n"); 316 err = PTR_ERR(vma); 317 goto cleanup; 318 } 319 320 i915_vma_unpin(vma); 321 322 /* Remove just the second vma */ 323 mutex_lock(&ggtt->vm.mutex); 324 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 325 mutex_unlock(&ggtt->vm.mutex); 326 if (err) { 327 pr_err("[0]i915_gem_evict_for_node returned err=%d\n", err); 328 goto cleanup; 329 } 330 331 /* Attempt to remove the first *pinned* vma, by removing the (empty) 332 * neighbour -- this should fail. 333 */ 334 target.color = I915_CACHE_L3_LLC; 335 336 mutex_lock(&ggtt->vm.mutex); 337 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 338 mutex_unlock(&ggtt->vm.mutex); 339 if (!err) { 340 pr_err("[1]i915_gem_evict_for_node returned err=%d\n", err); 341 err = -EINVAL; 342 goto cleanup; 343 } 344 345 err = 0; 346 347 cleanup: 348 unpin_ggtt(ggtt); 349 cleanup_objects(ggtt, &objects); 350 ggtt->vm.mm.color_adjust = NULL; 351 return err; 352 } 353 354 static int igt_evict_vm(void *arg) 355 { 356 struct intel_gt *gt = arg; 357 struct i915_ggtt *ggtt = gt->ggtt; 358 LIST_HEAD(objects); 359 int err; 360 361 /* Fill the GGTT with pinned objects and try to evict everything. */ 362 363 err = populate_ggtt(ggtt, &objects); 364 if (err) 365 goto cleanup; 366 367 /* Everything is pinned, nothing should happen */ 368 mutex_lock(&ggtt->vm.mutex); 369 err = i915_gem_evict_vm(&ggtt->vm); 370 mutex_unlock(&ggtt->vm.mutex); 371 if (err) { 372 pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n", 373 err); 374 goto cleanup; 375 } 376 377 unpin_ggtt(ggtt); 378 379 mutex_lock(&ggtt->vm.mutex); 380 err = i915_gem_evict_vm(&ggtt->vm); 381 mutex_unlock(&ggtt->vm.mutex); 382 if (err) { 383 pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n", 384 err); 385 goto cleanup; 386 } 387 388 cleanup: 389 cleanup_objects(ggtt, &objects); 390 return err; 391 } 392 393 static int igt_evict_contexts(void *arg) 394 { 395 const u64 PRETEND_GGTT_SIZE = 16ull << 20; 396 struct intel_gt *gt = arg; 397 struct i915_ggtt *ggtt = gt->ggtt; 398 struct drm_i915_private *i915 = gt->i915; 399 struct intel_engine_cs *engine; 400 enum intel_engine_id id; 401 struct reserved { 402 struct drm_mm_node node; 403 struct reserved *next; 404 } *reserved = NULL; 405 intel_wakeref_t wakeref; 406 struct drm_mm_node hole; 407 unsigned long count; 408 int err; 409 410 /* 411 * The purpose of this test is to verify that we will trigger an 412 * eviction in the GGTT when constructing a request that requires 413 * additional space in the GGTT for pinning the context. This space 414 * is not directly tied to the request so reclaiming it requires 415 * extra work. 416 * 417 * As such this test is only meaningful for full-ppgtt environments 418 * where the GTT space of the request is separate from the GGTT 419 * allocation required to build the request. 420 */ 421 if (!HAS_FULL_PPGTT(i915)) 422 return 0; 423 424 wakeref = intel_runtime_pm_get(&i915->runtime_pm); 425 426 /* Reserve a block so that we know we have enough to fit a few rq */ 427 memset(&hole, 0, sizeof(hole)); 428 mutex_lock(&ggtt->vm.mutex); 429 err = i915_gem_gtt_insert(&ggtt->vm, &hole, 430 PRETEND_GGTT_SIZE, 0, I915_COLOR_UNEVICTABLE, 431 0, ggtt->vm.total, 432 PIN_NOEVICT); 433 if (err) 434 goto out_locked; 435 436 /* Make the GGTT appear small by filling it with unevictable nodes */ 437 count = 0; 438 do { 439 struct reserved *r; 440 441 mutex_unlock(&ggtt->vm.mutex); 442 r = kcalloc(1, sizeof(*r), GFP_KERNEL); 443 mutex_lock(&ggtt->vm.mutex); 444 if (!r) { 445 err = -ENOMEM; 446 goto out_locked; 447 } 448 449 if (i915_gem_gtt_insert(&ggtt->vm, &r->node, 450 1ul << 20, 0, I915_COLOR_UNEVICTABLE, 451 0, ggtt->vm.total, 452 PIN_NOEVICT)) { 453 kfree(r); 454 break; 455 } 456 457 r->next = reserved; 458 reserved = r; 459 460 count++; 461 } while (1); 462 drm_mm_remove_node(&hole); 463 mutex_unlock(&ggtt->vm.mutex); 464 pr_info("Filled GGTT with %lu 1MiB nodes\n", count); 465 466 /* Overfill the GGTT with context objects and so try to evict one. */ 467 for_each_engine(engine, gt, id) { 468 struct i915_sw_fence fence; 469 struct drm_file *file; 470 471 file = mock_file(i915); 472 if (IS_ERR(file)) { 473 err = PTR_ERR(file); 474 break; 475 } 476 477 count = 0; 478 onstack_fence_init(&fence); 479 do { 480 struct i915_request *rq; 481 struct i915_gem_context *ctx; 482 483 ctx = live_context(i915, file); 484 if (IS_ERR(ctx)) 485 break; 486 487 /* We will need some GGTT space for the rq's context */ 488 igt_evict_ctl.fail_if_busy = true; 489 rq = igt_request_alloc(ctx, engine); 490 igt_evict_ctl.fail_if_busy = false; 491 492 if (IS_ERR(rq)) { 493 /* When full, fail_if_busy will trigger EBUSY */ 494 if (PTR_ERR(rq) != -EBUSY) { 495 pr_err("Unexpected error from request alloc (on %s): %d\n", 496 engine->name, 497 (int)PTR_ERR(rq)); 498 err = PTR_ERR(rq); 499 } 500 break; 501 } 502 503 /* Keep every request/ctx pinned until we are full */ 504 err = i915_sw_fence_await_sw_fence_gfp(&rq->submit, 505 &fence, 506 GFP_KERNEL); 507 if (err < 0) 508 break; 509 510 i915_request_add(rq); 511 count++; 512 err = 0; 513 } while(1); 514 onstack_fence_fini(&fence); 515 pr_info("Submitted %lu contexts/requests on %s\n", 516 count, engine->name); 517 518 mock_file_free(i915, file); 519 if (err) 520 break; 521 } 522 523 mutex_lock(&ggtt->vm.mutex); 524 out_locked: 525 if (igt_flush_test(i915)) 526 err = -EIO; 527 while (reserved) { 528 struct reserved *next = reserved->next; 529 530 drm_mm_remove_node(&reserved->node); 531 kfree(reserved); 532 533 reserved = next; 534 } 535 if (drm_mm_node_allocated(&hole)) 536 drm_mm_remove_node(&hole); 537 mutex_unlock(&ggtt->vm.mutex); 538 intel_runtime_pm_put(&i915->runtime_pm, wakeref); 539 540 return err; 541 } 542 543 int i915_gem_evict_mock_selftests(void) 544 { 545 static const struct i915_subtest tests[] = { 546 SUBTEST(igt_evict_something), 547 SUBTEST(igt_evict_for_vma), 548 SUBTEST(igt_evict_for_cache_color), 549 SUBTEST(igt_evict_vm), 550 SUBTEST(igt_overcommit), 551 }; 552 struct drm_i915_private *i915; 553 intel_wakeref_t wakeref; 554 int err = 0; 555 556 i915 = mock_gem_device(); 557 if (!i915) 558 return -ENOMEM; 559 560 with_intel_runtime_pm(&i915->runtime_pm, wakeref) 561 err = i915_subtests(tests, &i915->gt); 562 563 drm_dev_put(&i915->drm); 564 return err; 565 } 566 567 int i915_gem_evict_live_selftests(struct drm_i915_private *i915) 568 { 569 static const struct i915_subtest tests[] = { 570 SUBTEST(igt_evict_contexts), 571 }; 572 573 if (intel_gt_is_wedged(&i915->gt)) 574 return 0; 575 576 return intel_gt_live_subtests(tests, &i915->gt); 577 } 578