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 u64 size; 52 53 count = 0; 54 for (size = 0; 55 size + I915_GTT_PAGE_SIZE <= i915->ggtt.vm.total; 56 size += I915_GTT_PAGE_SIZE) { 57 struct i915_vma *vma; 58 59 obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE); 60 if (IS_ERR(obj)) 61 return PTR_ERR(obj); 62 63 quirk_add(obj, objects); 64 65 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0); 66 if (IS_ERR(vma)) 67 return PTR_ERR(vma); 68 69 count++; 70 } 71 72 bound = 0; 73 unbound = 0; 74 list_for_each_entry(obj, objects, st_link) { 75 GEM_BUG_ON(!obj->mm.quirked); 76 77 if (atomic_read(&obj->bind_count)) 78 bound++; 79 else 80 unbound++; 81 } 82 GEM_BUG_ON(bound + unbound != count); 83 84 if (unbound) { 85 pr_err("%s: Found %lu objects unbound, expected %u!\n", 86 __func__, unbound, 0); 87 return -EINVAL; 88 } 89 90 if (bound != count) { 91 pr_err("%s: Found %lu objects bound, expected %lu!\n", 92 __func__, bound, count); 93 return -EINVAL; 94 } 95 96 if (list_empty(&i915->ggtt.vm.bound_list)) { 97 pr_err("No objects on the GGTT inactive list!\n"); 98 return -EINVAL; 99 } 100 101 return 0; 102 } 103 104 static void unpin_ggtt(struct drm_i915_private *i915) 105 { 106 struct i915_ggtt *ggtt = &i915->ggtt; 107 struct i915_vma *vma; 108 109 mutex_lock(&ggtt->vm.mutex); 110 list_for_each_entry(vma, &i915->ggtt.vm.bound_list, vm_link) 111 if (vma->obj->mm.quirked) 112 i915_vma_unpin(vma); 113 mutex_unlock(&ggtt->vm.mutex); 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 mutex_unlock(&i915->drm.struct_mutex); 128 129 i915_gem_drain_freed_objects(i915); 130 131 mutex_lock(&i915->drm.struct_mutex); 132 } 133 134 static int igt_evict_something(void *arg) 135 { 136 struct drm_i915_private *i915 = arg; 137 struct i915_ggtt *ggtt = &i915->ggtt; 138 LIST_HEAD(objects); 139 int err; 140 141 /* Fill the GGTT with pinned objects and try to evict one. */ 142 143 err = populate_ggtt(i915, &objects); 144 if (err) 145 goto cleanup; 146 147 /* Everything is pinned, nothing should happen */ 148 err = i915_gem_evict_something(&ggtt->vm, 149 I915_GTT_PAGE_SIZE, 0, 0, 150 0, U64_MAX, 151 0); 152 if (err != -ENOSPC) { 153 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n", 154 err); 155 goto cleanup; 156 } 157 158 unpin_ggtt(i915); 159 160 /* Everything is unpinned, we should be able to evict something */ 161 err = i915_gem_evict_something(&ggtt->vm, 162 I915_GTT_PAGE_SIZE, 0, 0, 163 0, U64_MAX, 164 0); 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 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 231 if (err != -ENOSPC) { 232 pr_err("i915_gem_evict_for_node on a full GGTT returned err=%d\n", 233 err); 234 goto cleanup; 235 } 236 237 unpin_ggtt(i915); 238 239 /* Everything is unpinned, we should be able to evict the node */ 240 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 241 if (err) { 242 pr_err("i915_gem_evict_for_node returned err=%d\n", 243 err); 244 goto cleanup; 245 } 246 247 cleanup: 248 cleanup_objects(i915, &objects); 249 return err; 250 } 251 252 static void mock_color_adjust(const struct drm_mm_node *node, 253 unsigned long color, 254 u64 *start, 255 u64 *end) 256 { 257 } 258 259 static int igt_evict_for_cache_color(void *arg) 260 { 261 struct drm_i915_private *i915 = arg; 262 struct i915_ggtt *ggtt = &i915->ggtt; 263 const unsigned long flags = PIN_OFFSET_FIXED; 264 struct drm_mm_node target = { 265 .start = I915_GTT_PAGE_SIZE * 2, 266 .size = I915_GTT_PAGE_SIZE, 267 .color = I915_CACHE_LLC, 268 }; 269 struct drm_i915_gem_object *obj; 270 struct i915_vma *vma; 271 LIST_HEAD(objects); 272 int err; 273 274 /* Currently the use of color_adjust is limited to cache domains within 275 * the ggtt, and so the presence of mm.color_adjust is assumed to be 276 * i915_gtt_color_adjust throughout our driver, so using a mock color 277 * adjust will work just fine for our purposes. 278 */ 279 ggtt->vm.mm.color_adjust = mock_color_adjust; 280 281 obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE); 282 if (IS_ERR(obj)) { 283 err = PTR_ERR(obj); 284 goto cleanup; 285 } 286 i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC); 287 quirk_add(obj, &objects); 288 289 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 290 I915_GTT_PAGE_SIZE | flags); 291 if (IS_ERR(vma)) { 292 pr_err("[0]i915_gem_object_ggtt_pin failed\n"); 293 err = PTR_ERR(vma); 294 goto cleanup; 295 } 296 297 obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE); 298 if (IS_ERR(obj)) { 299 err = PTR_ERR(obj); 300 goto cleanup; 301 } 302 i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC); 303 quirk_add(obj, &objects); 304 305 /* Neighbouring; same colour - should fit */ 306 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 307 (I915_GTT_PAGE_SIZE * 2) | flags); 308 if (IS_ERR(vma)) { 309 pr_err("[1]i915_gem_object_ggtt_pin failed\n"); 310 err = PTR_ERR(vma); 311 goto cleanup; 312 } 313 314 i915_vma_unpin(vma); 315 316 /* Remove just the second vma */ 317 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 318 if (err) { 319 pr_err("[0]i915_gem_evict_for_node returned err=%d\n", err); 320 goto cleanup; 321 } 322 323 /* Attempt to remove the first *pinned* vma, by removing the (empty) 324 * neighbour -- this should fail. 325 */ 326 target.color = I915_CACHE_L3_LLC; 327 328 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0); 329 if (!err) { 330 pr_err("[1]i915_gem_evict_for_node returned err=%d\n", err); 331 err = -EINVAL; 332 goto cleanup; 333 } 334 335 err = 0; 336 337 cleanup: 338 unpin_ggtt(i915); 339 cleanup_objects(i915, &objects); 340 ggtt->vm.mm.color_adjust = NULL; 341 return err; 342 } 343 344 static int igt_evict_vm(void *arg) 345 { 346 struct drm_i915_private *i915 = arg; 347 struct i915_ggtt *ggtt = &i915->ggtt; 348 LIST_HEAD(objects); 349 int err; 350 351 /* Fill the GGTT with pinned objects and try to evict everything. */ 352 353 err = populate_ggtt(i915, &objects); 354 if (err) 355 goto cleanup; 356 357 /* Everything is pinned, nothing should happen */ 358 err = i915_gem_evict_vm(&ggtt->vm); 359 if (err) { 360 pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n", 361 err); 362 goto cleanup; 363 } 364 365 unpin_ggtt(i915); 366 367 err = i915_gem_evict_vm(&ggtt->vm); 368 if (err) { 369 pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n", 370 err); 371 goto cleanup; 372 } 373 374 cleanup: 375 cleanup_objects(i915, &objects); 376 return err; 377 } 378 379 static int igt_evict_contexts(void *arg) 380 { 381 const u64 PRETEND_GGTT_SIZE = 16ull << 20; 382 struct drm_i915_private *i915 = arg; 383 struct intel_engine_cs *engine; 384 enum intel_engine_id id; 385 struct reserved { 386 struct drm_mm_node node; 387 struct reserved *next; 388 } *reserved = NULL; 389 intel_wakeref_t wakeref; 390 struct drm_mm_node hole; 391 unsigned long count; 392 int err; 393 394 /* 395 * The purpose of this test is to verify that we will trigger an 396 * eviction in the GGTT when constructing a request that requires 397 * additional space in the GGTT for pinning the context. This space 398 * is not directly tied to the request so reclaiming it requires 399 * extra work. 400 * 401 * As such this test is only meaningful for full-ppgtt environments 402 * where the GTT space of the request is separate from the GGTT 403 * allocation required to build the request. 404 */ 405 if (!HAS_FULL_PPGTT(i915)) 406 return 0; 407 408 mutex_lock(&i915->drm.struct_mutex); 409 wakeref = intel_runtime_pm_get(&i915->runtime_pm); 410 411 /* Reserve a block so that we know we have enough to fit a few rq */ 412 memset(&hole, 0, sizeof(hole)); 413 err = i915_gem_gtt_insert(&i915->ggtt.vm, &hole, 414 PRETEND_GGTT_SIZE, 0, I915_COLOR_UNEVICTABLE, 415 0, i915->ggtt.vm.total, 416 PIN_NOEVICT); 417 if (err) 418 goto out_locked; 419 420 /* Make the GGTT appear small by filling it with unevictable nodes */ 421 count = 0; 422 do { 423 struct reserved *r; 424 425 r = kcalloc(1, sizeof(*r), GFP_KERNEL); 426 if (!r) { 427 err = -ENOMEM; 428 goto out_locked; 429 } 430 431 if (i915_gem_gtt_insert(&i915->ggtt.vm, &r->node, 432 1ul << 20, 0, I915_COLOR_UNEVICTABLE, 433 0, i915->ggtt.vm.total, 434 PIN_NOEVICT)) { 435 kfree(r); 436 break; 437 } 438 439 r->next = reserved; 440 reserved = r; 441 442 count++; 443 } while (1); 444 drm_mm_remove_node(&hole); 445 mutex_unlock(&i915->drm.struct_mutex); 446 pr_info("Filled GGTT with %lu 1MiB nodes\n", count); 447 448 /* Overfill the GGTT with context objects and so try to evict one. */ 449 for_each_engine(engine, i915, id) { 450 struct i915_sw_fence fence; 451 struct drm_file *file; 452 453 file = mock_file(i915); 454 if (IS_ERR(file)) { 455 err = PTR_ERR(file); 456 break; 457 } 458 459 count = 0; 460 mutex_lock(&i915->drm.struct_mutex); 461 onstack_fence_init(&fence); 462 do { 463 struct i915_request *rq; 464 struct i915_gem_context *ctx; 465 466 ctx = live_context(i915, file); 467 if (IS_ERR(ctx)) 468 break; 469 470 /* We will need some GGTT space for the rq's context */ 471 igt_evict_ctl.fail_if_busy = true; 472 rq = igt_request_alloc(ctx, engine); 473 igt_evict_ctl.fail_if_busy = false; 474 475 if (IS_ERR(rq)) { 476 /* When full, fail_if_busy will trigger EBUSY */ 477 if (PTR_ERR(rq) != -EBUSY) { 478 pr_err("Unexpected error from request alloc (ctx hw id %u, on %s): %d\n", 479 ctx->hw_id, engine->name, 480 (int)PTR_ERR(rq)); 481 err = PTR_ERR(rq); 482 } 483 break; 484 } 485 486 /* Keep every request/ctx pinned until we are full */ 487 err = i915_sw_fence_await_sw_fence_gfp(&rq->submit, 488 &fence, 489 GFP_KERNEL); 490 if (err < 0) 491 break; 492 493 i915_request_add(rq); 494 count++; 495 err = 0; 496 } while(1); 497 mutex_unlock(&i915->drm.struct_mutex); 498 499 onstack_fence_fini(&fence); 500 pr_info("Submitted %lu contexts/requests on %s\n", 501 count, engine->name); 502 503 mock_file_free(i915, file); 504 if (err) 505 break; 506 } 507 508 mutex_lock(&i915->drm.struct_mutex); 509 out_locked: 510 if (igt_flush_test(i915, I915_WAIT_LOCKED)) 511 err = -EIO; 512 while (reserved) { 513 struct reserved *next = reserved->next; 514 515 drm_mm_remove_node(&reserved->node); 516 kfree(reserved); 517 518 reserved = next; 519 } 520 if (drm_mm_node_allocated(&hole)) 521 drm_mm_remove_node(&hole); 522 intel_runtime_pm_put(&i915->runtime_pm, wakeref); 523 mutex_unlock(&i915->drm.struct_mutex); 524 525 return err; 526 } 527 528 int i915_gem_evict_mock_selftests(void) 529 { 530 static const struct i915_subtest tests[] = { 531 SUBTEST(igt_evict_something), 532 SUBTEST(igt_evict_for_vma), 533 SUBTEST(igt_evict_for_cache_color), 534 SUBTEST(igt_evict_vm), 535 SUBTEST(igt_overcommit), 536 }; 537 struct drm_i915_private *i915; 538 intel_wakeref_t wakeref; 539 int err = 0; 540 541 i915 = mock_gem_device(); 542 if (!i915) 543 return -ENOMEM; 544 545 mutex_lock(&i915->drm.struct_mutex); 546 with_intel_runtime_pm(&i915->runtime_pm, wakeref) 547 err = i915_subtests(tests, i915); 548 549 mutex_unlock(&i915->drm.struct_mutex); 550 551 drm_dev_put(&i915->drm); 552 return err; 553 } 554 555 int i915_gem_evict_live_selftests(struct drm_i915_private *i915) 556 { 557 static const struct i915_subtest tests[] = { 558 SUBTEST(igt_evict_contexts), 559 }; 560 561 if (intel_gt_is_wedged(&i915->gt)) 562 return 0; 563 564 return i915_subtests(tests, i915); 565 } 566