summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i915/selftests/i915_gem_evict.c
blob: ab9d7bee0aae1f3fbe371dbe68274f4423b1826d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
/*
 * Copyright © 2016 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 */

#include "../i915_selftest.h"

#include "lib_sw_fence.h"
#include "mock_context.h"
#include "mock_drm.h"
#include "mock_gem_device.h"

static int populate_ggtt(struct drm_i915_private *i915)
{
	struct drm_i915_gem_object *obj;
	u64 size;

	for (size = 0;
	     size + I915_GTT_PAGE_SIZE <= i915->ggtt.base.total;
	     size += I915_GTT_PAGE_SIZE) {
		struct i915_vma *vma;

		obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
		if (IS_ERR(obj))
			return PTR_ERR(obj);

		vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
		if (IS_ERR(vma))
			return PTR_ERR(vma);
	}

	if (!list_empty(&i915->mm.unbound_list)) {
		size = 0;
		list_for_each_entry(obj, &i915->mm.unbound_list, mm.link)
			size++;

		pr_err("Found %lld objects unbound!\n", size);
		return -EINVAL;
	}

	if (list_empty(&i915->ggtt.base.inactive_list)) {
		pr_err("No objects on the GGTT inactive list!\n");
		return -EINVAL;
	}

	return 0;
}

static void unpin_ggtt(struct drm_i915_private *i915)
{
	struct i915_vma *vma;

	list_for_each_entry(vma, &i915->ggtt.base.inactive_list, vm_link)
		i915_vma_unpin(vma);
}

static void cleanup_objects(struct drm_i915_private *i915)
{
	struct drm_i915_gem_object *obj, *on;

	list_for_each_entry_safe(obj, on, &i915->mm.unbound_list, mm.link)
		i915_gem_object_put(obj);

	list_for_each_entry_safe(obj, on, &i915->mm.bound_list, mm.link)
		i915_gem_object_put(obj);

	mutex_unlock(&i915->drm.struct_mutex);

	i915_gem_drain_freed_objects(i915);

	mutex_lock(&i915->drm.struct_mutex);
}

static int igt_evict_something(void *arg)
{
	struct drm_i915_private *i915 = arg;
	struct i915_ggtt *ggtt = &i915->ggtt;
	int err;

	/* Fill the GGTT with pinned objects and try to evict one. */

	err = populate_ggtt(i915);
	if (err)
		goto cleanup;

	/* Everything is pinned, nothing should happen */
	err = i915_gem_evict_something(&ggtt->base,
				       I915_GTT_PAGE_SIZE, 0, 0,
				       0, U64_MAX,
				       0);
	if (err != -ENOSPC) {
		pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
		       err);
		goto cleanup;
	}

	unpin_ggtt(i915);

	/* Everything is unpinned, we should be able to evict something */
	err = i915_gem_evict_something(&ggtt->base,
				       I915_GTT_PAGE_SIZE, 0, 0,
				       0, U64_MAX,
				       0);
	if (err) {
		pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
		       err);
		goto cleanup;
	}

cleanup:
	cleanup_objects(i915);
	return err;
}

static int igt_overcommit(void *arg)
{
	struct drm_i915_private *i915 = arg;
	struct drm_i915_gem_object *obj;
	struct i915_vma *vma;
	int err;

	/* Fill the GGTT with pinned objects and then try to pin one more.
	 * We expect it to fail.
	 */

	err = populate_ggtt(i915);
	if (err)
		goto cleanup;

	obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
	if (IS_ERR(obj)) {
		err = PTR_ERR(obj);
		goto cleanup;
	}

	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
	if (!IS_ERR(vma) || PTR_ERR(vma) != -ENOSPC) {
		pr_err("Failed to evict+insert, i915_gem_object_ggtt_pin returned err=%d\n", (int)PTR_ERR(vma));
		err = -EINVAL;
		goto cleanup;
	}

cleanup:
	cleanup_objects(i915);
	return err;
}

static int igt_evict_for_vma(void *arg)
{
	struct drm_i915_private *i915 = arg;
	struct i915_ggtt *ggtt = &i915->ggtt;
	struct drm_mm_node target = {
		.start = 0,
		.size = 4096,
	};
	int err;

	/* Fill the GGTT with pinned objects and try to evict a range. */

	err = populate_ggtt(i915);
	if (err)
		goto cleanup;

	/* Everything is pinned, nothing should happen */
	err = i915_gem_evict_for_node(&ggtt->base, &target, 0);
	if (err != -ENOSPC) {
		pr_err("i915_gem_evict_for_node on a full GGTT returned err=%d\n",
		       err);
		goto cleanup;
	}

	unpin_ggtt(i915);

	/* Everything is unpinned, we should be able to evict the node */
	err = i915_gem_evict_for_node(&ggtt->base, &target, 0);
	if (err) {
		pr_err("i915_gem_evict_for_node returned err=%d\n",
		       err);
		goto cleanup;
	}

cleanup:
	cleanup_objects(i915);
	return err;
}

static void mock_color_adjust(const struct drm_mm_node *node,
			      unsigned long color,
			      u64 *start,
			      u64 *end)
{
}

static int igt_evict_for_cache_color(void *arg)
{
	struct drm_i915_private *i915 = arg;
	struct i915_ggtt *ggtt = &i915->ggtt;
	const unsigned long flags = PIN_OFFSET_FIXED;
	struct drm_mm_node target = {
		.start = I915_GTT_PAGE_SIZE * 2,
		.size = I915_GTT_PAGE_SIZE,
		.color = I915_CACHE_LLC,
	};
	struct drm_i915_gem_object *obj;
	struct i915_vma *vma;
	int err;

	/* Currently the use of color_adjust is limited to cache domains within
	 * the ggtt, and so the presence of mm.color_adjust is assumed to be
	 * i915_gtt_color_adjust throughout our driver, so using a mock color
	 * adjust will work just fine for our purposes.
	 */
	ggtt->base.mm.color_adjust = mock_color_adjust;

	obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
	if (IS_ERR(obj)) {
		err = PTR_ERR(obj);
		goto cleanup;
	}
	i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);

	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
				       I915_GTT_PAGE_SIZE | flags);
	if (IS_ERR(vma)) {
		pr_err("[0]i915_gem_object_ggtt_pin failed\n");
		err = PTR_ERR(vma);
		goto cleanup;
	}

	obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
	if (IS_ERR(obj)) {
		err = PTR_ERR(obj);
		goto cleanup;
	}
	i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);

	/* Neighbouring; same colour - should fit */
	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
				       (I915_GTT_PAGE_SIZE * 2) | flags);
	if (IS_ERR(vma)) {
		pr_err("[1]i915_gem_object_ggtt_pin failed\n");
		err = PTR_ERR(vma);
		goto cleanup;
	}

	i915_vma_unpin(vma);

	/* Remove just the second vma */
	err = i915_gem_evict_for_node(&ggtt->base, &target, 0);
	if (err) {
		pr_err("[0]i915_gem_evict_for_node returned err=%d\n", err);
		goto cleanup;
	}

	/* Attempt to remove the first *pinned* vma, by removing the (empty)
	 * neighbour -- this should fail.
	 */
	target.color = I915_CACHE_L3_LLC;

	err = i915_gem_evict_for_node(&ggtt->base, &target, 0);
	if (!err) {
		pr_err("[1]i915_gem_evict_for_node returned err=%d\n", err);
		err = -EINVAL;
		goto cleanup;
	}

	err = 0;

cleanup:
	unpin_ggtt(i915);
	cleanup_objects(i915);
	ggtt->base.mm.color_adjust = NULL;
	return err;
}

static int igt_evict_vm(void *arg)
{
	struct drm_i915_private *i915 = arg;
	struct i915_ggtt *ggtt = &i915->ggtt;
	int err;

	/* Fill the GGTT with pinned objects and try to evict everything. */

	err = populate_ggtt(i915);
	if (err)
		goto cleanup;

	/* Everything is pinned, nothing should happen */
	err = i915_gem_evict_vm(&ggtt->base);
	if (err) {
		pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
		       err);
		goto cleanup;
	}

	unpin_ggtt(i915);

	err = i915_gem_evict_vm(&ggtt->base);
	if (err) {
		pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
		       err);
		goto cleanup;
	}

cleanup:
	cleanup_objects(i915);
	return err;
}

static int igt_evict_contexts(void *arg)
{
	const u64 PRETEND_GGTT_SIZE = 16ull << 20;
	struct drm_i915_private *i915 = arg;
	struct intel_engine_cs *engine;
	enum intel_engine_id id;
	struct reserved {
		struct drm_mm_node node;
		struct reserved *next;
	} *reserved = NULL;
	struct drm_mm_node hole;
	unsigned long count;
	int err;

	/*
	 * The purpose of this test is to verify that we will trigger an
	 * eviction in the GGTT when constructing a request that requires
	 * additional space in the GGTT for pinning the context. This space
	 * is not directly tied to the request so reclaiming it requires
	 * extra work.
	 *
	 * As such this test is only meaningful for full-ppgtt environments
	 * where the GTT space of the request is separate from the GGTT
	 * allocation required to build the request.
	 */
	if (!USES_FULL_PPGTT(i915))
		return 0;

	mutex_lock(&i915->drm.struct_mutex);
	intel_runtime_pm_get(i915);

	/* Reserve a block so that we know we have enough to fit a few rq */
	memset(&hole, 0, sizeof(hole));
	err = i915_gem_gtt_insert(&i915->ggtt.base, &hole,
				  PRETEND_GGTT_SIZE, 0, I915_COLOR_UNEVICTABLE,
				  0, i915->ggtt.base.total,
				  PIN_NOEVICT);
	if (err)
		goto out_locked;

	/* Make the GGTT appear small by filling it with unevictable nodes */
	count = 0;
	do {
		struct reserved *r;

		r = kcalloc(1, sizeof(*r), GFP_KERNEL);
		if (!r) {
			err = -ENOMEM;
			goto out_locked;
		}

		if (i915_gem_gtt_insert(&i915->ggtt.base, &r->node,
					1ul << 20, 0, I915_COLOR_UNEVICTABLE,
					0, i915->ggtt.base.total,
					PIN_NOEVICT)) {
			kfree(r);
			break;
		}

		r->next = reserved;
		reserved = r;

		count++;
	} while (1);
	drm_mm_remove_node(&hole);
	mutex_unlock(&i915->drm.struct_mutex);
	pr_info("Filled GGTT with %lu 1MiB nodes\n", count);

	/* Overfill the GGTT with context objects and so try to evict one. */
	for_each_engine(engine, i915, id) {
		struct i915_sw_fence fence;
		struct drm_file *file;

		file = mock_file(i915);
		if (IS_ERR(file))
			return PTR_ERR(file);

		count = 0;
		mutex_lock(&i915->drm.struct_mutex);
		onstack_fence_init(&fence);
		do {
			struct i915_request *rq;
			struct i915_gem_context *ctx;

			ctx = live_context(i915, file);
			if (!ctx)
				break;

			/* We will need some GGTT space for the rq's context */
			igt_evict_ctl.fail_if_busy = true;
			rq = i915_request_alloc(engine, ctx);
			igt_evict_ctl.fail_if_busy = false;

			if (IS_ERR(rq)) {
				/* When full, fail_if_busy will trigger EBUSY */
				if (PTR_ERR(rq) != -EBUSY) {
					pr_err("Unexpected error from request alloc (ctx hw id %u, on %s): %d\n",
					       ctx->hw_id, engine->name,
					       (int)PTR_ERR(rq));
					err = PTR_ERR(rq);
				}
				break;
			}

			/* Keep every request/ctx pinned until we are full */
			err = i915_sw_fence_await_sw_fence_gfp(&rq->submit,
							       &fence,
							       GFP_KERNEL);
			if (err < 0)
				break;

			i915_request_add(rq);
			count++;
			err = 0;
		} while(1);
		mutex_unlock(&i915->drm.struct_mutex);

		onstack_fence_fini(&fence);
		pr_info("Submitted %lu contexts/requests on %s\n",
			count, engine->name);

		mock_file_free(i915, file);
		if (err)
			break;
	}

	mutex_lock(&i915->drm.struct_mutex);
out_locked:
	while (reserved) {
		struct reserved *next = reserved->next;

		drm_mm_remove_node(&reserved->node);
		kfree(reserved);

		reserved = next;
	}
	if (drm_mm_node_allocated(&hole))
		drm_mm_remove_node(&hole);
	intel_runtime_pm_put(i915);
	mutex_unlock(&i915->drm.struct_mutex);

	return err;
}

int i915_gem_evict_mock_selftests(void)
{
	static const struct i915_subtest tests[] = {
		SUBTEST(igt_evict_something),
		SUBTEST(igt_evict_for_vma),
		SUBTEST(igt_evict_for_cache_color),
		SUBTEST(igt_evict_vm),
		SUBTEST(igt_overcommit),
	};
	struct drm_i915_private *i915;
	int err;

	i915 = mock_gem_device();
	if (!i915)
		return -ENOMEM;

	mutex_lock(&i915->drm.struct_mutex);
	err = i915_subtests(tests, i915);
	mutex_unlock(&i915->drm.struct_mutex);

	drm_dev_unref(&i915->drm);
	return err;
}

int i915_gem_evict_live_selftests(struct drm_i915_private *i915)
{
	static const struct i915_subtest tests[] = {
		SUBTEST(igt_evict_contexts),
	};

	return i915_subtests(tests, i915);
}