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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
37static 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
46static 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
107static 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
119static 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
137static 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
174cleanup:
175 cleanup_objects(i915, &objects);
176 return err;
177}
178
179static 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
210cleanup:
211 cleanup_objects(i915, &objects);
212 return err;
213}
214
215static 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
250cleanup:
251 cleanup_objects(i915, &objects);
252 return err;
253}
254
255static void mock_color_adjust(const struct drm_mm_node *node,
256 unsigned long color,
257 u64 *start,
258 u64 *end)
259{
260}
261
262static 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
340cleanup:
341 unpin_ggtt(i915);
342 cleanup_objects(i915, &objects);
343 ggtt->vm.mm.color_adjust = NULL;
344 return err;
345}
346
347static 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
377cleanup:
378 cleanup_objects(i915, &objects);
379 return err;
380}
381
382static 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);
512out_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
531int 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
558int 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}