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_internal.h"
26 #include "gem/i915_gem_pm.h"
27 #include "gem/selftests/igt_gem_utils.h"
28 #include "gem/selftests/mock_context.h"
29 #include "gt/intel_gt.h"
30
31 #include "i915_selftest.h"
32
33 #include "igt_flush_test.h"
34 #include "lib_sw_fence.h"
35 #include "mock_drm.h"
36 #include "mock_gem_device.h"
37
quirk_add(struct drm_i915_gem_object * obj,struct list_head * objects)38 static void quirk_add(struct drm_i915_gem_object *obj,
39 struct list_head *objects)
40 {
41 /* quirk is only for live tiled objects, use it to declare ownership */
42 GEM_BUG_ON(i915_gem_object_has_tiling_quirk(obj));
43 i915_gem_object_set_tiling_quirk(obj);
44 list_add(&obj->st_link, objects);
45 }
46
populate_ggtt(struct i915_ggtt * ggtt,struct list_head * objects)47 static int populate_ggtt(struct i915_ggtt *ggtt, struct list_head *objects)
48 {
49 struct drm_i915_gem_object *obj;
50 unsigned long count;
51
52 count = 0;
53 do {
54 struct i915_vma *vma;
55
56 obj = i915_gem_object_create_internal(ggtt->vm.i915,
57 I915_GTT_PAGE_SIZE);
58 if (IS_ERR(obj))
59 return PTR_ERR(obj);
60
61 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
62 if (IS_ERR(vma)) {
63 i915_gem_object_put(obj);
64 if (vma == ERR_PTR(-ENOSPC))
65 break;
66
67 return PTR_ERR(vma);
68 }
69
70 quirk_add(obj, objects);
71 count++;
72 } while (1);
73 pr_debug("Filled GGTT with %lu pages [%llu total]\n",
74 count, ggtt->vm.total / PAGE_SIZE);
75
76 if (list_empty(&ggtt->vm.bound_list)) {
77 pr_err("No objects on the GGTT inactive list!\n");
78 return -EINVAL;
79 }
80
81 return 0;
82 }
83
unpin_ggtt(struct i915_ggtt * ggtt)84 static void unpin_ggtt(struct i915_ggtt *ggtt)
85 {
86 struct i915_vma *vma;
87
88 list_for_each_entry(vma, &ggtt->vm.bound_list, vm_link)
89 if (i915_gem_object_has_tiling_quirk(vma->obj))
90 i915_vma_unpin(vma);
91 }
92
cleanup_objects(struct i915_ggtt * ggtt,struct list_head * list)93 static void cleanup_objects(struct i915_ggtt *ggtt, struct list_head *list)
94 {
95 struct drm_i915_gem_object *obj, *on;
96
97 list_for_each_entry_safe(obj, on, list, st_link) {
98 GEM_BUG_ON(!i915_gem_object_has_tiling_quirk(obj));
99 i915_gem_object_set_tiling_quirk(obj);
100 i915_gem_object_put(obj);
101 }
102
103 i915_gem_drain_freed_objects(ggtt->vm.i915);
104 }
105
igt_evict_something(void * arg)106 static int igt_evict_something(void *arg)
107 {
108 struct intel_gt *gt = arg;
109 struct i915_ggtt *ggtt = gt->ggtt;
110 LIST_HEAD(objects);
111 int err;
112
113 /* Fill the GGTT with pinned objects and try to evict one. */
114
115 err = populate_ggtt(ggtt, &objects);
116 if (err)
117 goto cleanup;
118
119 /* Everything is pinned, nothing should happen */
120 mutex_lock(&ggtt->vm.mutex);
121 err = i915_gem_evict_something(&ggtt->vm, NULL,
122 I915_GTT_PAGE_SIZE, 0, 0,
123 0, U64_MAX,
124 0);
125 mutex_unlock(&ggtt->vm.mutex);
126 if (err != -ENOSPC) {
127 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
128 err);
129 goto cleanup;
130 }
131
132 unpin_ggtt(ggtt);
133
134 /* Everything is unpinned, we should be able to evict something */
135 mutex_lock(&ggtt->vm.mutex);
136 err = i915_gem_evict_something(&ggtt->vm, NULL,
137 I915_GTT_PAGE_SIZE, 0, 0,
138 0, U64_MAX,
139 0);
140 mutex_unlock(&ggtt->vm.mutex);
141 if (err) {
142 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
143 err);
144 goto cleanup;
145 }
146
147 cleanup:
148 cleanup_objects(ggtt, &objects);
149 return err;
150 }
151
igt_overcommit(void * arg)152 static int igt_overcommit(void *arg)
153 {
154 struct intel_gt *gt = arg;
155 struct i915_ggtt *ggtt = gt->ggtt;
156 struct drm_i915_gem_object *obj;
157 struct i915_vma *vma;
158 LIST_HEAD(objects);
159 int err;
160
161 /* Fill the GGTT with pinned objects and then try to pin one more.
162 * We expect it to fail.
163 */
164
165 err = populate_ggtt(ggtt, &objects);
166 if (err)
167 goto cleanup;
168
169 obj = i915_gem_object_create_internal(gt->i915, I915_GTT_PAGE_SIZE);
170 if (IS_ERR(obj)) {
171 err = PTR_ERR(obj);
172 goto cleanup;
173 }
174
175 quirk_add(obj, &objects);
176
177 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
178 if (vma != ERR_PTR(-ENOSPC)) {
179 pr_err("Failed to evict+insert, i915_gem_object_ggtt_pin returned err=%d\n", (int)PTR_ERR_OR_ZERO(vma));
180 err = -EINVAL;
181 goto cleanup;
182 }
183
184 cleanup:
185 cleanup_objects(ggtt, &objects);
186 return err;
187 }
188
igt_evict_for_vma(void * arg)189 static int igt_evict_for_vma(void *arg)
190 {
191 struct intel_gt *gt = arg;
192 struct i915_ggtt *ggtt = gt->ggtt;
193 struct drm_mm_node target = {
194 .start = 0,
195 .size = 4096,
196 };
197 LIST_HEAD(objects);
198 int err;
199
200 /* Fill the GGTT with pinned objects and try to evict a range. */
201
202 err = populate_ggtt(ggtt, &objects);
203 if (err)
204 goto cleanup;
205
206 /* Everything is pinned, nothing should happen */
207 mutex_lock(&ggtt->vm.mutex);
208 err = i915_gem_evict_for_node(&ggtt->vm, NULL, &target, 0);
209 mutex_unlock(&ggtt->vm.mutex);
210 if (err != -ENOSPC) {
211 pr_err("i915_gem_evict_for_node on a full GGTT returned err=%d\n",
212 err);
213 goto cleanup;
214 }
215
216 unpin_ggtt(ggtt);
217
218 /* Everything is unpinned, we should be able to evict the node */
219 mutex_lock(&ggtt->vm.mutex);
220 err = i915_gem_evict_for_node(&ggtt->vm, NULL, &target, 0);
221 mutex_unlock(&ggtt->vm.mutex);
222 if (err) {
223 pr_err("i915_gem_evict_for_node returned err=%d\n",
224 err);
225 goto cleanup;
226 }
227
228 cleanup:
229 cleanup_objects(ggtt, &objects);
230 return err;
231 }
232
mock_color_adjust(const struct drm_mm_node * node,unsigned long color,u64 * start,u64 * end)233 static void mock_color_adjust(const struct drm_mm_node *node,
234 unsigned long color,
235 u64 *start,
236 u64 *end)
237 {
238 }
239
igt_evict_for_cache_color(void * arg)240 static int igt_evict_for_cache_color(void *arg)
241 {
242 struct intel_gt *gt = arg;
243 struct i915_ggtt *ggtt = gt->ggtt;
244 const unsigned long flags = PIN_OFFSET_FIXED;
245 struct drm_mm_node target = {
246 .start = I915_GTT_PAGE_SIZE * 2,
247 .size = I915_GTT_PAGE_SIZE,
248 .color = I915_CACHE_LLC,
249 };
250 struct drm_i915_gem_object *obj;
251 struct i915_vma *vma;
252 LIST_HEAD(objects);
253 int err;
254
255 /*
256 * Currently the use of color_adjust for the GGTT is limited to cache
257 * coloring and guard pages, and so the presence of mm.color_adjust for
258 * the GGTT is assumed to be i915_ggtt_color_adjust, hence using a mock
259 * color adjust will work just fine for our purposes.
260 */
261 ggtt->vm.mm.color_adjust = mock_color_adjust;
262 GEM_BUG_ON(!i915_vm_has_cache_coloring(&ggtt->vm));
263
264 obj = i915_gem_object_create_internal(gt->i915, I915_GTT_PAGE_SIZE);
265 if (IS_ERR(obj)) {
266 err = PTR_ERR(obj);
267 goto cleanup;
268 }
269 i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC);
270 quirk_add(obj, &objects);
271
272 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
273 I915_GTT_PAGE_SIZE | flags);
274 if (IS_ERR(vma)) {
275 pr_err("[0]i915_gem_object_ggtt_pin failed\n");
276 err = PTR_ERR(vma);
277 goto cleanup;
278 }
279
280 obj = i915_gem_object_create_internal(gt->i915, I915_GTT_PAGE_SIZE);
281 if (IS_ERR(obj)) {
282 err = PTR_ERR(obj);
283 goto cleanup;
284 }
285 i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC);
286 quirk_add(obj, &objects);
287
288 /* Neighbouring; same colour - should fit */
289 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
290 (I915_GTT_PAGE_SIZE * 2) | flags);
291 if (IS_ERR(vma)) {
292 pr_err("[1]i915_gem_object_ggtt_pin failed\n");
293 err = PTR_ERR(vma);
294 goto cleanup;
295 }
296
297 i915_vma_unpin(vma);
298
299 /* Remove just the second vma */
300 mutex_lock(&ggtt->vm.mutex);
301 err = i915_gem_evict_for_node(&ggtt->vm, NULL, &target, 0);
302 mutex_unlock(&ggtt->vm.mutex);
303 if (err) {
304 pr_err("[0]i915_gem_evict_for_node returned err=%d\n", err);
305 goto cleanup;
306 }
307
308 /* Attempt to remove the first *pinned* vma, by removing the (empty)
309 * neighbour -- this should fail.
310 */
311 target.color = I915_CACHE_L3_LLC;
312
313 mutex_lock(&ggtt->vm.mutex);
314 err = i915_gem_evict_for_node(&ggtt->vm, NULL, &target, 0);
315 mutex_unlock(&ggtt->vm.mutex);
316 if (!err) {
317 pr_err("[1]i915_gem_evict_for_node returned err=%d\n", err);
318 err = -EINVAL;
319 goto cleanup;
320 }
321
322 err = 0;
323
324 cleanup:
325 unpin_ggtt(ggtt);
326 cleanup_objects(ggtt, &objects);
327 ggtt->vm.mm.color_adjust = NULL;
328 return err;
329 }
330
igt_evict_vm(void * arg)331 static int igt_evict_vm(void *arg)
332 {
333 struct intel_gt *gt = arg;
334 struct i915_ggtt *ggtt = gt->ggtt;
335 struct i915_gem_ww_ctx ww;
336 LIST_HEAD(objects);
337 int err;
338
339 /* Fill the GGTT with pinned objects and try to evict everything. */
340
341 err = populate_ggtt(ggtt, &objects);
342 if (err)
343 goto cleanup;
344
345 /* Everything is pinned, nothing should happen */
346 mutex_lock(&ggtt->vm.mutex);
347 err = i915_gem_evict_vm(&ggtt->vm, NULL, NULL);
348 mutex_unlock(&ggtt->vm.mutex);
349 if (err) {
350 pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
351 err);
352 goto cleanup;
353 }
354
355 unpin_ggtt(ggtt);
356
357 for_i915_gem_ww(&ww, err, false) {
358 mutex_lock(&ggtt->vm.mutex);
359 err = i915_gem_evict_vm(&ggtt->vm, &ww, NULL);
360 mutex_unlock(&ggtt->vm.mutex);
361 }
362
363 if (err) {
364 pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
365 err);
366 goto cleanup;
367 }
368
369 cleanup:
370 cleanup_objects(ggtt, &objects);
371 return err;
372 }
373
igt_evict_contexts(void * arg)374 static int igt_evict_contexts(void *arg)
375 {
376 const u64 PRETEND_GGTT_SIZE = 16ull << 20;
377 struct intel_gt *gt = arg;
378 struct i915_ggtt *ggtt = gt->ggtt;
379 struct drm_i915_private *i915 = gt->i915;
380 struct intel_engine_cs *engine;
381 enum intel_engine_id id;
382 struct reserved {
383 struct drm_mm_node node;
384 struct reserved *next;
385 } *reserved = NULL;
386 intel_wakeref_t wakeref;
387 struct drm_mm_node hole;
388 unsigned long count;
389 int err;
390
391 /*
392 * The purpose of this test is to verify that we will trigger an
393 * eviction in the GGTT when constructing a request that requires
394 * additional space in the GGTT for pinning the context. This space
395 * is not directly tied to the request so reclaiming it requires
396 * extra work.
397 *
398 * As such this test is only meaningful for full-ppgtt environments
399 * where the GTT space of the request is separate from the GGTT
400 * allocation required to build the request.
401 */
402 if (!HAS_FULL_PPGTT(i915))
403 return 0;
404
405 wakeref = intel_runtime_pm_get(&i915->runtime_pm);
406
407 /* Reserve a block so that we know we have enough to fit a few rq */
408 memset(&hole, 0, sizeof(hole));
409 mutex_lock(&ggtt->vm.mutex);
410 err = i915_gem_gtt_insert(&ggtt->vm, NULL, &hole,
411 PRETEND_GGTT_SIZE, 0, I915_COLOR_UNEVICTABLE,
412 0, ggtt->vm.total,
413 PIN_NOEVICT);
414 if (err)
415 goto out_locked;
416
417 /* Make the GGTT appear small by filling it with unevictable nodes */
418 count = 0;
419 do {
420 struct reserved *r;
421
422 mutex_unlock(&ggtt->vm.mutex);
423 r = kcalloc(1, sizeof(*r), GFP_KERNEL);
424 mutex_lock(&ggtt->vm.mutex);
425 if (!r) {
426 err = -ENOMEM;
427 goto out_locked;
428 }
429
430 if (i915_gem_gtt_insert(&ggtt->vm, NULL, &r->node,
431 1ul << 20, 0, I915_COLOR_UNEVICTABLE,
432 0, ggtt->vm.total,
433 PIN_NOEVICT)) {
434 kfree(r);
435 break;
436 }
437
438 r->next = reserved;
439 reserved = r;
440
441 count++;
442 } while (1);
443 drm_mm_remove_node(&hole);
444 mutex_unlock(&ggtt->vm.mutex);
445 pr_info("Filled GGTT with %lu 1MiB nodes\n", count);
446
447 /* Overfill the GGTT with context objects and so try to evict one. */
448 for_each_engine(engine, gt, id) {
449 struct i915_sw_fence fence;
450 struct i915_request *last = NULL;
451
452 count = 0;
453 onstack_fence_init(&fence);
454 do {
455 struct intel_context *ce;
456 struct i915_request *rq;
457
458 ce = intel_context_create(engine);
459 if (IS_ERR(ce))
460 break;
461
462 /* We will need some GGTT space for the rq's context */
463 igt_evict_ctl.fail_if_busy = true;
464 rq = intel_context_create_request(ce);
465 igt_evict_ctl.fail_if_busy = false;
466 intel_context_put(ce);
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 if (last)
489 i915_request_put(last);
490 last = i915_request_get(rq);
491 err = 0;
492 } while(1);
493 onstack_fence_fini(&fence);
494 pr_info("Submitted %lu contexts/requests on %s\n",
495 count, engine->name);
496 if (err)
497 break;
498 if (last) {
499 if (i915_request_wait(last, 0, HZ) < 0) {
500 err = -EIO;
501 i915_request_put(last);
502 pr_err("Failed waiting for last request (on %s)",
503 engine->name);
504 break;
505 }
506 i915_request_put(last);
507 }
508 err = intel_gt_wait_for_idle(engine->gt, HZ * 3);
509 if (err) {
510 pr_err("Failed to idle GT (on %s)", engine->name);
511 break;
512 }
513 }
514
515 mutex_lock(&ggtt->vm.mutex);
516 out_locked:
517 if (igt_flush_test(i915))
518 err = -EIO;
519 while (reserved) {
520 struct reserved *next = reserved->next;
521
522 drm_mm_remove_node(&reserved->node);
523 kfree(reserved);
524
525 reserved = next;
526 }
527 if (drm_mm_node_allocated(&hole))
528 drm_mm_remove_node(&hole);
529 mutex_unlock(&ggtt->vm.mutex);
530 intel_runtime_pm_put(&i915->runtime_pm, wakeref);
531
532 return err;
533 }
534
i915_gem_evict_mock_selftests(void)535 int i915_gem_evict_mock_selftests(void)
536 {
537 static const struct i915_subtest tests[] = {
538 SUBTEST(igt_evict_something),
539 SUBTEST(igt_evict_for_vma),
540 SUBTEST(igt_evict_for_cache_color),
541 SUBTEST(igt_evict_vm),
542 SUBTEST(igt_overcommit),
543 };
544 struct drm_i915_private *i915;
545 intel_wakeref_t wakeref;
546 int err = 0;
547
548 i915 = mock_gem_device();
549 if (!i915)
550 return -ENOMEM;
551
552 with_intel_runtime_pm(&i915->runtime_pm, wakeref)
553 err = i915_subtests(tests, to_gt(i915));
554
555 mock_destroy_device(i915);
556 return err;
557 }
558
i915_gem_evict_live_selftests(struct drm_i915_private * i915)559 int i915_gem_evict_live_selftests(struct drm_i915_private *i915)
560 {
561 static const struct i915_subtest tests[] = {
562 SUBTEST(igt_evict_contexts),
563 };
564
565 if (intel_gt_is_wedged(to_gt(i915)))
566 return 0;
567
568 return intel_gt_live_subtests(tests, to_gt(i915));
569 }
570