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 } 554