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 drm_i915_private *i915, 47 struct list_head *objects) 48 { 49 unsigned long unbound, bound, count; 50 struct drm_i915_gem_object *obj; 51 52 count = 0; 53 do { 54 struct i915_vma *vma; 55 56 obj = i915_gem_object_create_internal(i915, 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, i915->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(&i915->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 drm_i915_private *i915) 108 { 109 struct i915_vma *vma; 110 111 list_for_each_entry(vma, &i915->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 drm_i915_private *i915, 117 struct list_head *list) 118 { 119 struct drm_i915_gem_object *obj, *on; 120 121 list_for_each_entry_safe(obj, on, list, st_link) { 122 GEM_BUG_ON(!obj->mm.quirked); 123 obj->mm.quirked = false; 124 i915_gem_object_put(obj); 125 } 126 127 i915_gem_drain_freed_objects(i915); 128 } 129 130 static int igt_evict_something(void *arg) 131 { 132 struct drm_i915_private *i915 = arg; 133 struct i915_ggtt *ggtt = &i915->ggtt; 134 LIST_HEAD(objects); 135 int err; 136 137 /* Fill the GGTT with pinned objects and try to evict one. */ 138 139 err = populate_ggtt(i915, &objects); 140 if (err) 141 goto cleanup; 142 143 /* Everything is pinned, nothing should happen */ 144 mutex_lock(&ggtt->vm.mutex); 145 err = i915_gem_evict_something(&ggtt->vm, 146 I915_GTT_PAGE_SIZE, 0, 0, 147 0, U64_MAX, 148 0); 149 mutex_unlock(&ggtt->vm.mutex); 150 if (err != -ENOSPC) { 151 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n", 152 err); 153 goto cleanup; 154 } 155 156 unpin_ggtt(i915); 157 158 /* Everything is unpinned, we should be able to evict something */ 159 mutex_lock(&ggtt->vm.mutex); 160 err = i915_gem_evict_something(&ggtt->vm, 161 I915_GTT_PAGE_SIZE, 0, 0, 162 0, U64_MAX, 163 0); 164 mutex_unlock(&ggtt->vm.mutex); 165 if (err) { 166 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n", 167 err); 168 goto cleanup; 169 } 170 171 cleanup: 172 cleanup_objects(i915, &objects); 173 return err; 174 } 175 176 static int igt_overcommit(void *arg) 177 { 178 struct drm_i915_private *i915 = arg; 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(i915, &objects); 189 if (err) 190 goto cleanup; 191 192 obj = i915_gem_object_create_internal(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(i915, &objects); 209 return err; 210 } 211 212 static int igt_evict_for_vma(void *arg) 213 { 214 struct drm_i915_private *i915 = arg; 215 struct i915_ggtt *ggtt = &i915->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(i915, &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(i915); 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(i915, &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 drm_i915_private *i915 = arg; 266 struct i915_ggtt *ggtt = &i915->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(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(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(i915); 349 cleanup_objects(i915, &objects); 350 ggtt->vm.mm.color_adjust = NULL; 351 return err; 352 } 353 354 static int igt_evict_vm(void *arg) 355 { 356 struct drm_i915_private *i915 = arg; 357 struct i915_ggtt *ggtt = &i915->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(i915, &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(i915); 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(i915, &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 drm_i915_private *i915 = arg; 397 struct intel_engine_cs *engine; 398 enum intel_engine_id id; 399 struct reserved { 400 struct drm_mm_node node; 401 struct reserved *next; 402 } *reserved = NULL; 403 intel_wakeref_t wakeref; 404 struct drm_mm_node hole; 405 unsigned long count; 406 int err; 407 408 /* 409 * The purpose of this test is to verify that we will trigger an 410 * eviction in the GGTT when constructing a request that requires 411 * additional space in the GGTT for pinning the context. This space 412 * is not directly tied to the request so reclaiming it requires 413 * extra work. 414 * 415 * As such this test is only meaningful for full-ppgtt environments 416 * where the GTT space of the request is separate from the GGTT 417 * allocation required to build the request. 418 */ 419 if (!HAS_FULL_PPGTT(i915)) 420 return 0; 421 422 wakeref = intel_runtime_pm_get(&i915->runtime_pm); 423 424 /* Reserve a block so that we know we have enough to fit a few rq */ 425 memset(&hole, 0, sizeof(hole)); 426 mutex_lock(&i915->ggtt.vm.mutex); 427 err = i915_gem_gtt_insert(&i915->ggtt.vm, &hole, 428 PRETEND_GGTT_SIZE, 0, I915_COLOR_UNEVICTABLE, 429 0, i915->ggtt.vm.total, 430 PIN_NOEVICT); 431 if (err) 432 goto out_locked; 433 434 /* Make the GGTT appear small by filling it with unevictable nodes */ 435 count = 0; 436 do { 437 struct reserved *r; 438 439 mutex_unlock(&i915->ggtt.vm.mutex); 440 r = kcalloc(1, sizeof(*r), GFP_KERNEL); 441 mutex_lock(&i915->ggtt.vm.mutex); 442 if (!r) { 443 err = -ENOMEM; 444 goto out_locked; 445 } 446 447 if (i915_gem_gtt_insert(&i915->ggtt.vm, &r->node, 448 1ul << 20, 0, I915_COLOR_UNEVICTABLE, 449 0, i915->ggtt.vm.total, 450 PIN_NOEVICT)) { 451 kfree(r); 452 break; 453 } 454 455 r->next = reserved; 456 reserved = r; 457 458 count++; 459 } while (1); 460 drm_mm_remove_node(&hole); 461 mutex_unlock(&i915->ggtt.vm.mutex); 462 pr_info("Filled GGTT with %lu 1MiB nodes\n", count); 463 464 /* Overfill the GGTT with context objects and so try to evict one. */ 465 for_each_engine(engine, i915, id) { 466 struct i915_sw_fence fence; 467 struct drm_file *file; 468 469 file = mock_file(i915); 470 if (IS_ERR(file)) { 471 err = PTR_ERR(file); 472 break; 473 } 474 475 count = 0; 476 onstack_fence_init(&fence); 477 do { 478 struct i915_request *rq; 479 struct i915_gem_context *ctx; 480 481 ctx = live_context(i915, file); 482 if (IS_ERR(ctx)) 483 break; 484 485 /* We will need some GGTT space for the rq's context */ 486 igt_evict_ctl.fail_if_busy = true; 487 rq = igt_request_alloc(ctx, engine); 488 igt_evict_ctl.fail_if_busy = false; 489 490 if (IS_ERR(rq)) { 491 /* When full, fail_if_busy will trigger EBUSY */ 492 if (PTR_ERR(rq) != -EBUSY) { 493 pr_err("Unexpected error from request alloc (on %s): %d\n", 494 engine->name, 495 (int)PTR_ERR(rq)); 496 err = PTR_ERR(rq); 497 } 498 break; 499 } 500 501 /* Keep every request/ctx pinned until we are full */ 502 err = i915_sw_fence_await_sw_fence_gfp(&rq->submit, 503 &fence, 504 GFP_KERNEL); 505 if (err < 0) 506 break; 507 508 i915_request_add(rq); 509 count++; 510 err = 0; 511 } while(1); 512 onstack_fence_fini(&fence); 513 pr_info("Submitted %lu contexts/requests on %s\n", 514 count, engine->name); 515 516 mock_file_free(i915, file); 517 if (err) 518 break; 519 } 520 521 mutex_lock(&i915->ggtt.vm.mutex); 522 out_locked: 523 if (igt_flush_test(i915)) 524 err = -EIO; 525 while (reserved) { 526 struct reserved *next = reserved->next; 527 528 drm_mm_remove_node(&reserved->node); 529 kfree(reserved); 530 531 reserved = next; 532 } 533 if (drm_mm_node_allocated(&hole)) 534 drm_mm_remove_node(&hole); 535 mutex_unlock(&i915->ggtt.vm.mutex); 536 intel_runtime_pm_put(&i915->runtime_pm, wakeref); 537 538 return err; 539 } 540 541 int i915_gem_evict_mock_selftests(void) 542 { 543 static const struct i915_subtest tests[] = { 544 SUBTEST(igt_evict_something), 545 SUBTEST(igt_evict_for_vma), 546 SUBTEST(igt_evict_for_cache_color), 547 SUBTEST(igt_evict_vm), 548 SUBTEST(igt_overcommit), 549 }; 550 struct drm_i915_private *i915; 551 intel_wakeref_t wakeref; 552 int err = 0; 553 554 i915 = mock_gem_device(); 555 if (!i915) 556 return -ENOMEM; 557 558 with_intel_runtime_pm(&i915->runtime_pm, wakeref) 559 err = i915_subtests(tests, i915); 560 561 drm_dev_put(&i915->drm); 562 return err; 563 } 564 565 int i915_gem_evict_live_selftests(struct drm_i915_private *i915) 566 { 567 static const struct i915_subtest tests[] = { 568 SUBTEST(igt_evict_contexts), 569 }; 570 571 if (intel_gt_is_wedged(&i915->gt)) 572 return 0; 573 574 return i915_subtests(tests, i915); 575 } 576