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_ggtt *ggtt = &i915->ggtt; 110 struct i915_vma *vma; 111 112 mutex_lock(&ggtt->vm.mutex); 113 list_for_each_entry(vma, &i915->ggtt.vm.bound_list, vm_link) 114 if (vma->obj->mm.quirked) 115 i915_vma_unpin(vma); 116 mutex_unlock(&ggtt->vm.mutex); 117 } 118 119 static void cleanup_objects(struct drm_i915_private *i915, 120 struct list_head *list) 121 { 122 struct drm_i915_gem_object *obj, *on; 123 124 list_for_each_entry_safe(obj, on, list, st_link) { 125 GEM_BUG_ON(!obj->mm.quirked); 126 obj->mm.quirked = false; 127 i915_gem_object_put(obj); 128 } 129 130 mutex_unlock(&i915->drm.struct_mutex); 131 132 i915_gem_drain_freed_objects(i915); 133 134 mutex_lock(&i915->drm.struct_mutex); 135 } 136 137 static int igt_evict_something(void *arg) 138 { 139 struct drm_i915_private *i915 = arg; 140 struct i915_ggtt *ggtt = &i915->ggtt; 141 LIST_HEAD(objects); 142 int err; 143 144 /* Fill the GGTT with pinned objects and try to evict one. */ 145 146 err = populate_ggtt(i915, &objects); 147 if (err) 148 goto cleanup; 149 150 /* Everything is pinned, nothing should happen */ 151 err = i915_gem_evict_something(&ggtt->vm, 152 I915_GTT_PAGE_SIZE, 0, 0, 153 0, U64_MAX, 154 0); 155 if (err != -ENOSPC) { 156 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n", 157 err); 158 goto cleanup; 159 } 160 161 unpin_ggtt(i915); 162 163 /* Everything is unpinned, we should be able to evict something */ 164 err = i915_gem_evict_something(&ggtt->vm, 165 I915_GTT_PAGE_SIZE, 0, 0, 166 0, U64_MAX, 167 0); 168 if (err) { 169 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n", 170 err); 171 goto cleanup; 172 } 173 174 cleanup: 175 cleanup_objects(i915, &objects); 176 return err; 177 } 178 179 static int igt_overcommit(void *arg) 180 { 181 struct drm_i915_private *i915 = arg; 182 struct drm_i915_gem_object *obj; 183 struct i915_vma *vma; 184 LIST_HEAD(objects); 185 int err; 186 187 /* Fill the GGTT with pinned objects and then try to pin one more. 188 * We expect it to fail. 189 */ 190 191 err = populate_ggtt(i915, &objects); 192 if (err) 193 goto cleanup; 194 195 obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE); 196 if (IS_ERR(obj)) { 197 err = PTR_ERR(obj); 198 goto cleanup; 199 } 200 201 quirk_add(obj, &objects); 202 203 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0); 204 if (!IS_ERR(vma) || PTR_ERR(vma) != -ENOSPC) { 205 pr_err("Failed to evict+insert, i915_gem_object_ggtt_pin returned err=%d\n", (int)PTR_ERR(vma)); 206 err = -EINVAL; 207 goto cleanup; 208 } 209 210 cleanup: 211 cleanup_objects(i915, &objects); 212 return err; 213 } 214 215 static int igt_evict_for_vma(void *arg) 216 { 217 struct drm_i915_private *i915 = arg; 218 struct i915_ggtt *ggtt = &i915->ggtt; 219 struct drm_mm_node target = { 220 .start = 0, 221 .size = 4096, 222 }; 223 LIST_HEAD(objects); 224 int err; 225 226 /* Fill the GGTT with pinned objects and try to evict a range. */ 227 228 err = populate_ggtt(i915, &objects); 229 if (err) 230 goto cleanup; 231 232 /* Everything is pinned, nothing should happen */ 233 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 234 if (err != -ENOSPC) { 235 pr_err("i915_gem_evict_for_node on a full GGTT returned err=%d\n", 236 err); 237 goto cleanup; 238 } 239 240 unpin_ggtt(i915); 241 242 /* Everything is unpinned, we should be able to evict the node */ 243 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 244 if (err) { 245 pr_err("i915_gem_evict_for_node returned err=%d\n", 246 err); 247 goto cleanup; 248 } 249 250 cleanup: 251 cleanup_objects(i915, &objects); 252 return err; 253 } 254 255 static void mock_color_adjust(const struct drm_mm_node *node, 256 unsigned long color, 257 u64 *start, 258 u64 *end) 259 { 260 } 261 262 static int igt_evict_for_cache_color(void *arg) 263 { 264 struct drm_i915_private *i915 = arg; 265 struct i915_ggtt *ggtt = &i915->ggtt; 266 const unsigned long flags = PIN_OFFSET_FIXED; 267 struct drm_mm_node target = { 268 .start = I915_GTT_PAGE_SIZE * 2, 269 .size = I915_GTT_PAGE_SIZE, 270 .color = I915_CACHE_LLC, 271 }; 272 struct drm_i915_gem_object *obj; 273 struct i915_vma *vma; 274 LIST_HEAD(objects); 275 int err; 276 277 /* Currently the use of color_adjust is limited to cache domains within 278 * the ggtt, and so the presence of mm.color_adjust is assumed to be 279 * i915_gtt_color_adjust throughout our driver, so using a mock color 280 * adjust will work just fine for our purposes. 281 */ 282 ggtt->vm.mm.color_adjust = mock_color_adjust; 283 284 obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE); 285 if (IS_ERR(obj)) { 286 err = PTR_ERR(obj); 287 goto cleanup; 288 } 289 i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC); 290 quirk_add(obj, &objects); 291 292 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 293 I915_GTT_PAGE_SIZE | flags); 294 if (IS_ERR(vma)) { 295 pr_err("[0]i915_gem_object_ggtt_pin failed\n"); 296 err = PTR_ERR(vma); 297 goto cleanup; 298 } 299 300 obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE); 301 if (IS_ERR(obj)) { 302 err = PTR_ERR(obj); 303 goto cleanup; 304 } 305 i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC); 306 quirk_add(obj, &objects); 307 308 /* Neighbouring; same colour - should fit */ 309 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 310 (I915_GTT_PAGE_SIZE * 2) | flags); 311 if (IS_ERR(vma)) { 312 pr_err("[1]i915_gem_object_ggtt_pin failed\n"); 313 err = PTR_ERR(vma); 314 goto cleanup; 315 } 316 317 i915_vma_unpin(vma); 318 319 /* Remove just the second vma */ 320 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 321 if (err) { 322 pr_err("[0]i915_gem_evict_for_node returned err=%d\n", err); 323 goto cleanup; 324 } 325 326 /* Attempt to remove the first *pinned* vma, by removing the (empty) 327 * neighbour -- this should fail. 328 */ 329 target.color = I915_CACHE_L3_LLC; 330 331 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 332 if (!err) { 333 pr_err("[1]i915_gem_evict_for_node returned err=%d\n", err); 334 err = -EINVAL; 335 goto cleanup; 336 } 337 338 err = 0; 339 340 cleanup: 341 unpin_ggtt(i915); 342 cleanup_objects(i915, &objects); 343 ggtt->vm.mm.color_adjust = NULL; 344 return err; 345 } 346 347 static int igt_evict_vm(void *arg) 348 { 349 struct drm_i915_private *i915 = arg; 350 struct i915_ggtt *ggtt = &i915->ggtt; 351 LIST_HEAD(objects); 352 int err; 353 354 /* Fill the GGTT with pinned objects and try to evict everything. */ 355 356 err = populate_ggtt(i915, &objects); 357 if (err) 358 goto cleanup; 359 360 /* Everything is pinned, nothing should happen */ 361 err = i915_gem_evict_vm(&ggtt->vm); 362 if (err) { 363 pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n", 364 err); 365 goto cleanup; 366 } 367 368 unpin_ggtt(i915); 369 370 err = i915_gem_evict_vm(&ggtt->vm); 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 cleanup: 378 cleanup_objects(i915, &objects); 379 return err; 380 } 381 382 static int igt_evict_contexts(void *arg) 383 { 384 const u64 PRETEND_GGTT_SIZE = 16ull << 20; 385 struct drm_i915_private *i915 = arg; 386 struct intel_engine_cs *engine; 387 enum intel_engine_id id; 388 struct reserved { 389 struct drm_mm_node node; 390 struct reserved *next; 391 } *reserved = NULL; 392 intel_wakeref_t wakeref; 393 struct drm_mm_node hole; 394 unsigned long count; 395 int err; 396 397 /* 398 * The purpose of this test is to verify that we will trigger an 399 * eviction in the GGTT when constructing a request that requires 400 * additional space in the GGTT for pinning the context. This space 401 * is not directly tied to the request so reclaiming it requires 402 * extra work. 403 * 404 * As such this test is only meaningful for full-ppgtt environments 405 * where the GTT space of the request is separate from the GGTT 406 * allocation required to build the request. 407 */ 408 if (!HAS_FULL_PPGTT(i915)) 409 return 0; 410 411 mutex_lock(&i915->drm.struct_mutex); 412 wakeref = intel_runtime_pm_get(&i915->runtime_pm); 413 414 /* Reserve a block so that we know we have enough to fit a few rq */ 415 memset(&hole, 0, sizeof(hole)); 416 err = i915_gem_gtt_insert(&i915->ggtt.vm, &hole, 417 PRETEND_GGTT_SIZE, 0, I915_COLOR_UNEVICTABLE, 418 0, i915->ggtt.vm.total, 419 PIN_NOEVICT); 420 if (err) 421 goto out_locked; 422 423 /* Make the GGTT appear small by filling it with unevictable nodes */ 424 count = 0; 425 do { 426 struct reserved *r; 427 428 r = kcalloc(1, sizeof(*r), GFP_KERNEL); 429 if (!r) { 430 err = -ENOMEM; 431 goto out_locked; 432 } 433 434 if (i915_gem_gtt_insert(&i915->ggtt.vm, &r->node, 435 1ul << 20, 0, I915_COLOR_UNEVICTABLE, 436 0, i915->ggtt.vm.total, 437 PIN_NOEVICT)) { 438 kfree(r); 439 break; 440 } 441 442 r->next = reserved; 443 reserved = r; 444 445 count++; 446 } while (1); 447 drm_mm_remove_node(&hole); 448 mutex_unlock(&i915->drm.struct_mutex); 449 pr_info("Filled GGTT with %lu 1MiB nodes\n", count); 450 451 /* Overfill the GGTT with context objects and so try to evict one. */ 452 for_each_engine(engine, i915, id) { 453 struct i915_sw_fence fence; 454 struct drm_file *file; 455 456 file = mock_file(i915); 457 if (IS_ERR(file)) { 458 err = PTR_ERR(file); 459 break; 460 } 461 462 count = 0; 463 mutex_lock(&i915->drm.struct_mutex); 464 onstack_fence_init(&fence); 465 do { 466 struct i915_request *rq; 467 struct i915_gem_context *ctx; 468 469 ctx = live_context(i915, file); 470 if (IS_ERR(ctx)) 471 break; 472 473 /* We will need some GGTT space for the rq's context */ 474 igt_evict_ctl.fail_if_busy = true; 475 rq = igt_request_alloc(ctx, engine); 476 igt_evict_ctl.fail_if_busy = false; 477 478 if (IS_ERR(rq)) { 479 /* When full, fail_if_busy will trigger EBUSY */ 480 if (PTR_ERR(rq) != -EBUSY) { 481 pr_err("Unexpected error from request alloc (ctx hw id %u, on %s): %d\n", 482 ctx->hw_id, engine->name, 483 (int)PTR_ERR(rq)); 484 err = PTR_ERR(rq); 485 } 486 break; 487 } 488 489 /* Keep every request/ctx pinned until we are full */ 490 err = i915_sw_fence_await_sw_fence_gfp(&rq->submit, 491 &fence, 492 GFP_KERNEL); 493 if (err < 0) 494 break; 495 496 i915_request_add(rq); 497 count++; 498 err = 0; 499 } while(1); 500 mutex_unlock(&i915->drm.struct_mutex); 501 502 onstack_fence_fini(&fence); 503 pr_info("Submitted %lu contexts/requests on %s\n", 504 count, engine->name); 505 506 mock_file_free(i915, file); 507 if (err) 508 break; 509 } 510 511 mutex_lock(&i915->drm.struct_mutex); 512 out_locked: 513 if (igt_flush_test(i915, I915_WAIT_LOCKED)) 514 err = -EIO; 515 while (reserved) { 516 struct reserved *next = reserved->next; 517 518 drm_mm_remove_node(&reserved->node); 519 kfree(reserved); 520 521 reserved = next; 522 } 523 if (drm_mm_node_allocated(&hole)) 524 drm_mm_remove_node(&hole); 525 intel_runtime_pm_put(&i915->runtime_pm, wakeref); 526 mutex_unlock(&i915->drm.struct_mutex); 527 528 return err; 529 } 530 531 int i915_gem_evict_mock_selftests(void) 532 { 533 static const struct i915_subtest tests[] = { 534 SUBTEST(igt_evict_something), 535 SUBTEST(igt_evict_for_vma), 536 SUBTEST(igt_evict_for_cache_color), 537 SUBTEST(igt_evict_vm), 538 SUBTEST(igt_overcommit), 539 }; 540 struct drm_i915_private *i915; 541 intel_wakeref_t wakeref; 542 int err = 0; 543 544 i915 = mock_gem_device(); 545 if (!i915) 546 return -ENOMEM; 547 548 mutex_lock(&i915->drm.struct_mutex); 549 with_intel_runtime_pm(&i915->runtime_pm, wakeref) 550 err = i915_subtests(tests, i915); 551 552 mutex_unlock(&i915->drm.struct_mutex); 553 554 drm_dev_put(&i915->drm); 555 return err; 556 } 557 558 int i915_gem_evict_live_selftests(struct drm_i915_private *i915) 559 { 560 static const struct i915_subtest tests[] = { 561 SUBTEST(igt_evict_contexts), 562 }; 563 564 if (intel_gt_is_wedged(&i915->gt)) 565 return 0; 566 567 return i915_subtests(tests, i915); 568 } 569