summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i915/i915_vma.c
blob: e924a95160796d1c8aa708e1c9ac0312b1015eb8 (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
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
/*
 * 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_vma.h"

#include "i915_drv.h"
#include "intel_ringbuffer.h"
#include "intel_frontbuffer.h"

#include <drm/drm_gem.h>

static void
i915_vma_retire(struct i915_gem_active *active,
		struct drm_i915_gem_request *rq)
{
	const unsigned int idx = rq->engine->id;
	struct i915_vma *vma =
		container_of(active, struct i915_vma, last_read[idx]);
	struct drm_i915_gem_object *obj = vma->obj;

	GEM_BUG_ON(!i915_vma_has_active_engine(vma, idx));

	i915_vma_clear_active(vma, idx);
	if (i915_vma_is_active(vma))
		return;

	list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
	if (unlikely(i915_vma_is_closed(vma) && !i915_vma_is_pinned(vma)))
		WARN_ON(i915_vma_unbind(vma));

	GEM_BUG_ON(!i915_gem_object_is_active(obj));
	if (--obj->active_count)
		return;

	/* Bump our place on the bound list to keep it roughly in LRU order
	 * so that we don't steal from recently used but inactive objects
	 * (unless we are forced to ofc!)
	 */
	if (obj->bind_count)
		list_move_tail(&obj->global_link, &rq->i915->mm.bound_list);

	obj->mm.dirty = true; /* be paranoid  */

	if (i915_gem_object_has_active_reference(obj)) {
		i915_gem_object_clear_active_reference(obj);
		i915_gem_object_put(obj);
	}
}

static struct i915_vma *
__i915_vma_create(struct drm_i915_gem_object *obj,
		  struct i915_address_space *vm,
		  const struct i915_ggtt_view *view)
{
	struct i915_vma *vma;
	struct rb_node *rb, **p;
	int i;

	GEM_BUG_ON(vm->closed);

	vma = kmem_cache_zalloc(to_i915(obj->base.dev)->vmas, GFP_KERNEL);
	if (vma == NULL)
		return ERR_PTR(-ENOMEM);

	INIT_LIST_HEAD(&vma->exec_list);
	for (i = 0; i < ARRAY_SIZE(vma->last_read); i++)
		init_request_active(&vma->last_read[i], i915_vma_retire);
	init_request_active(&vma->last_fence, NULL);
	list_add(&vma->vm_link, &vm->unbound_list);
	vma->vm = vm;
	vma->obj = obj;
	vma->size = obj->base.size;

	if (view) {
		vma->ggtt_view = *view;
		if (view->type == I915_GGTT_VIEW_PARTIAL) {
			vma->size = view->params.partial.size;
			vma->size <<= PAGE_SHIFT;
		} else if (view->type == I915_GGTT_VIEW_ROTATED) {
			vma->size =
				intel_rotation_info_size(&view->params.rotated);
			vma->size <<= PAGE_SHIFT;
		}
	}

	if (i915_is_ggtt(vm)) {
		vma->flags |= I915_VMA_GGTT;
		list_add(&vma->obj_link, &obj->vma_list);
	} else {
		i915_ppgtt_get(i915_vm_to_ppgtt(vm));
		list_add_tail(&vma->obj_link, &obj->vma_list);
	}

	rb = NULL;
	p = &obj->vma_tree.rb_node;
	while (*p) {
		struct i915_vma *pos;

		rb = *p;
		pos = rb_entry(rb, struct i915_vma, obj_node);
		if (i915_vma_compare(pos, vm, view) < 0)
			p = &rb->rb_right;
		else
			p = &rb->rb_left;
	}
	rb_link_node(&vma->obj_node, rb, p);
	rb_insert_color(&vma->obj_node, &obj->vma_tree);

	return vma;
}

struct i915_vma *
i915_vma_create(struct drm_i915_gem_object *obj,
		struct i915_address_space *vm,
		const struct i915_ggtt_view *view)
{
	lockdep_assert_held(&obj->base.dev->struct_mutex);
	GEM_BUG_ON(view && !i915_is_ggtt(vm));
	GEM_BUG_ON(i915_gem_obj_to_vma(obj, vm, view));

	return __i915_vma_create(obj, vm, view);
}

/**
 * i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space.
 * @vma: VMA to map
 * @cache_level: mapping cache level
 * @flags: flags like global or local mapping
 *
 * DMA addresses are taken from the scatter-gather table of this object (or of
 * this VMA in case of non-default GGTT views) and PTE entries set up.
 * Note that DMA addresses are also the only part of the SG table we care about.
 */
int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
		  u32 flags)
{
	u32 bind_flags;
	u32 vma_flags;
	int ret;

	if (WARN_ON(flags == 0))
		return -EINVAL;

	bind_flags = 0;
	if (flags & PIN_GLOBAL)
		bind_flags |= I915_VMA_GLOBAL_BIND;
	if (flags & PIN_USER)
		bind_flags |= I915_VMA_LOCAL_BIND;

	vma_flags = vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);
	if (flags & PIN_UPDATE)
		bind_flags |= vma_flags;
	else
		bind_flags &= ~vma_flags;
	if (bind_flags == 0)
		return 0;

	if (vma_flags == 0 && vma->vm->allocate_va_range) {
		trace_i915_va_alloc(vma);
		ret = vma->vm->allocate_va_range(vma->vm,
						 vma->node.start,
						 vma->node.size);
		if (ret)
			return ret;
	}

	trace_i915_vma_bind(vma, bind_flags);
	ret = vma->vm->bind_vma(vma, cache_level, bind_flags);
	if (ret)
		return ret;

	vma->flags |= bind_flags;
	return 0;
}

void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
{
	void __iomem *ptr;

	/* Access through the GTT requires the device to be awake. */
	assert_rpm_wakelock_held(to_i915(vma->vm->dev));

	lockdep_assert_held(&vma->vm->dev->struct_mutex);
	if (WARN_ON(!i915_vma_is_map_and_fenceable(vma)))
		return IO_ERR_PTR(-ENODEV);

	GEM_BUG_ON(!i915_vma_is_ggtt(vma));
	GEM_BUG_ON((vma->flags & I915_VMA_GLOBAL_BIND) == 0);

	ptr = vma->iomap;
	if (ptr == NULL) {
		ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->mappable,
					vma->node.start,
					vma->node.size);
		if (ptr == NULL)
			return IO_ERR_PTR(-ENOMEM);

		vma->iomap = ptr;
	}

	__i915_vma_pin(vma);
	return ptr;
}

void i915_vma_unpin_and_release(struct i915_vma **p_vma)
{
	struct i915_vma *vma;
	struct drm_i915_gem_object *obj;

	vma = fetch_and_zero(p_vma);
	if (!vma)
		return;

	obj = vma->obj;

	i915_vma_unpin(vma);
	i915_vma_close(vma);

	__i915_gem_object_release_unless_active(obj);
}

bool
i915_vma_misplaced(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
{
	if (!drm_mm_node_allocated(&vma->node))
		return false;

	if (vma->node.size < size)
		return true;

	if (alignment && vma->node.start & (alignment - 1))
		return true;

	if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
		return true;

	if (flags & PIN_OFFSET_BIAS &&
	    vma->node.start < (flags & PIN_OFFSET_MASK))
		return true;

	if (flags & PIN_OFFSET_FIXED &&
	    vma->node.start != (flags & PIN_OFFSET_MASK))
		return true;

	return false;
}

void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
{
	struct drm_i915_gem_object *obj = vma->obj;
	struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
	bool mappable, fenceable;
	u32 fence_size, fence_alignment;

	fence_size = i915_gem_get_ggtt_size(dev_priv,
					    vma->size,
					    i915_gem_object_get_tiling(obj));
	fence_alignment = i915_gem_get_ggtt_alignment(dev_priv,
						      vma->size,
						      i915_gem_object_get_tiling(obj),
						      true);

	fenceable = (vma->node.size == fence_size &&
		     (vma->node.start & (fence_alignment - 1)) == 0);

	mappable = (vma->node.start + fence_size <=
		    dev_priv->ggtt.mappable_end);

	/*
	 * Explicitly disable for rotated VMA since the display does not
	 * need the fence and the VMA is not accessible to other users.
	 */
	if (mappable && fenceable &&
	    vma->ggtt_view.type != I915_GGTT_VIEW_ROTATED)
		vma->flags |= I915_VMA_CAN_FENCE;
	else
		vma->flags &= ~I915_VMA_CAN_FENCE;
}

bool i915_gem_valid_gtt_space(struct i915_vma *vma,
			      unsigned long cache_level)
{
	struct drm_mm_node *gtt_space = &vma->node;
	struct drm_mm_node *other;

	/*
	 * On some machines we have to be careful when putting differing types
	 * of snoopable memory together to avoid the prefetcher crossing memory
	 * domains and dying. During vm initialisation, we decide whether or not
	 * these constraints apply and set the drm_mm.color_adjust
	 * appropriately.
	 */
	if (vma->vm->mm.color_adjust == NULL)
		return true;

	if (!drm_mm_node_allocated(gtt_space))
		return true;

	if (list_empty(&gtt_space->node_list))
		return true;

	other = list_entry(gtt_space->node_list.prev, struct drm_mm_node, node_list);
	if (other->allocated && !other->hole_follows && other->color != cache_level)
		return false;

	other = list_entry(gtt_space->node_list.next, struct drm_mm_node, node_list);
	if (other->allocated && !gtt_space->hole_follows && other->color != cache_level)
		return false;

	return true;
}

/**
 * i915_vma_insert - finds a slot for the vma in its address space
 * @vma: the vma
 * @size: requested size in bytes (can be larger than the VMA)
 * @alignment: required alignment
 * @flags: mask of PIN_* flags to use
 *
 * First we try to allocate some free space that meets the requirements for
 * the VMA. Failiing that, if the flags permit, it will evict an old VMA,
 * preferrably the oldest idle entry to make room for the new VMA.
 *
 * Returns:
 * 0 on success, negative error code otherwise.
 */
static int
i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
{
	struct drm_i915_private *dev_priv = to_i915(vma->vm->dev);
	struct drm_i915_gem_object *obj = vma->obj;
	u64 start, end;
	int ret;

	GEM_BUG_ON(vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
	GEM_BUG_ON(drm_mm_node_allocated(&vma->node));

	size = max(size, vma->size);
	if (flags & PIN_MAPPABLE)
		size = i915_gem_get_ggtt_size(dev_priv, size,
					      i915_gem_object_get_tiling(obj));

	alignment = max(max(alignment, vma->display_alignment),
			i915_gem_get_ggtt_alignment(dev_priv, size,
						    i915_gem_object_get_tiling(obj),
						    flags & PIN_MAPPABLE));

	start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;

	end = vma->vm->total;
	if (flags & PIN_MAPPABLE)
		end = min_t(u64, end, dev_priv->ggtt.mappable_end);
	if (flags & PIN_ZONE_4G)
		end = min_t(u64, end, (1ULL << 32) - PAGE_SIZE);

	/* If binding the object/GGTT view requires more space than the entire
	 * aperture has, reject it early before evicting everything in a vain
	 * attempt to find space.
	 */
	if (size > end) {
		DRM_DEBUG("Attempting to bind an object larger than the aperture: request=%llu [object=%zd] > %s aperture=%llu\n",
			  size, obj->base.size,
			  flags & PIN_MAPPABLE ? "mappable" : "total",
			  end);
		return -E2BIG;
	}

	ret = i915_gem_object_pin_pages(obj);
	if (ret)
		return ret;

	if (flags & PIN_OFFSET_FIXED) {
		u64 offset = flags & PIN_OFFSET_MASK;
		if (offset & (alignment - 1) || offset > end - size) {
			ret = -EINVAL;
			goto err_unpin;
		}

		vma->node.start = offset;
		vma->node.size = size;
		vma->node.color = obj->cache_level;
		ret = drm_mm_reserve_node(&vma->vm->mm, &vma->node);
		if (ret) {
			ret = i915_gem_evict_for_vma(vma);
			if (ret == 0)
				ret = drm_mm_reserve_node(&vma->vm->mm, &vma->node);
			if (ret)
				goto err_unpin;
		}
	} else {
		u32 search_flag, alloc_flag;

		if (flags & PIN_HIGH) {
			search_flag = DRM_MM_SEARCH_BELOW;
			alloc_flag = DRM_MM_CREATE_TOP;
		} else {
			search_flag = DRM_MM_SEARCH_DEFAULT;
			alloc_flag = DRM_MM_CREATE_DEFAULT;
		}

		/* We only allocate in PAGE_SIZE/GTT_PAGE_SIZE (4096) chunks,
		 * so we know that we always have a minimum alignment of 4096.
		 * The drm_mm range manager is optimised to return results
		 * with zero alignment, so where possible use the optimal
		 * path.
		 */
		if (alignment <= 4096)
			alignment = 0;

search_free:
		ret = drm_mm_insert_node_in_range_generic(&vma->vm->mm,
							  &vma->node,
							  size, alignment,
							  obj->cache_level,
							  start, end,
							  search_flag,
							  alloc_flag);
		if (ret) {
			ret = i915_gem_evict_something(vma->vm, size, alignment,
						       obj->cache_level,
						       start, end,
						       flags);
			if (ret == 0)
				goto search_free;

			goto err_unpin;
		}

		GEM_BUG_ON(vma->node.start < start);
		GEM_BUG_ON(vma->node.start + vma->node.size > end);
	}
	GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level));

	list_move_tail(&obj->global_link, &dev_priv->mm.bound_list);
	list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
	obj->bind_count++;
	GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);

	return 0;

err_unpin:
	i915_gem_object_unpin_pages(obj);
	return ret;
}

int __i915_vma_do_pin(struct i915_vma *vma,
		      u64 size, u64 alignment, u64 flags)
{
	unsigned int bound = vma->flags;
	int ret;

	lockdep_assert_held(&vma->vm->dev->struct_mutex);
	GEM_BUG_ON((flags & (PIN_GLOBAL | PIN_USER)) == 0);
	GEM_BUG_ON((flags & PIN_GLOBAL) && !i915_vma_is_ggtt(vma));

	if (WARN_ON(bound & I915_VMA_PIN_OVERFLOW)) {
		ret = -EBUSY;
		goto err;
	}

	if ((bound & I915_VMA_BIND_MASK) == 0) {
		ret = i915_vma_insert(vma, size, alignment, flags);
		if (ret)
			goto err;
	}

	ret = i915_vma_bind(vma, vma->obj->cache_level, flags);
	if (ret)
		goto err;

	if ((bound ^ vma->flags) & I915_VMA_GLOBAL_BIND)
		__i915_vma_set_map_and_fenceable(vma);

	GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
	return 0;

err:
	__i915_vma_unpin(vma);
	return ret;
}

void i915_vma_destroy(struct i915_vma *vma)
{
	GEM_BUG_ON(vma->node.allocated);
	GEM_BUG_ON(i915_vma_is_active(vma));
	GEM_BUG_ON(!i915_vma_is_closed(vma));
	GEM_BUG_ON(vma->fence);

	list_del(&vma->vm_link);
	if (!i915_vma_is_ggtt(vma))
		i915_ppgtt_put(i915_vm_to_ppgtt(vma->vm));

	kmem_cache_free(to_i915(vma->obj->base.dev)->vmas, vma);
}

void i915_vma_close(struct i915_vma *vma)
{
	GEM_BUG_ON(i915_vma_is_closed(vma));
	vma->flags |= I915_VMA_CLOSED;

	list_del(&vma->obj_link);
	rb_erase(&vma->obj_node, &vma->obj->vma_tree);

	if (!i915_vma_is_active(vma) && !i915_vma_is_pinned(vma))
		WARN_ON(i915_vma_unbind(vma));
}

static void __i915_vma_iounmap(struct i915_vma *vma)
{
	GEM_BUG_ON(i915_vma_is_pinned(vma));

	if (vma->iomap == NULL)
		return;

	io_mapping_unmap(vma->iomap);
	vma->iomap = NULL;
}

int i915_vma_unbind(struct i915_vma *vma)
{
	struct drm_i915_gem_object *obj = vma->obj;
	unsigned long active;
	int ret;

	lockdep_assert_held(&obj->base.dev->struct_mutex);

	/* First wait upon any activity as retiring the request may
	 * have side-effects such as unpinning or even unbinding this vma.
	 */
	active = i915_vma_get_active(vma);
	if (active) {
		int idx;

		/* When a closed VMA is retired, it is unbound - eek.
		 * In order to prevent it from being recursively closed,
		 * take a pin on the vma so that the second unbind is
		 * aborted.
		 *
		 * Even more scary is that the retire callback may free
		 * the object (last active vma). To prevent the explosion
		 * we defer the actual object free to a worker that can
		 * only proceed once it acquires the struct_mutex (which
		 * we currently hold, therefore it cannot free this object
		 * before we are finished).
		 */
		__i915_vma_pin(vma);

		for_each_active(active, idx) {
			ret = i915_gem_active_retire(&vma->last_read[idx],
						   &vma->vm->dev->struct_mutex);
			if (ret)
				break;
		}

		__i915_vma_unpin(vma);
		if (ret)
			return ret;

		GEM_BUG_ON(i915_vma_is_active(vma));
	}

	if (i915_vma_is_pinned(vma))
		return -EBUSY;

	if (!drm_mm_node_allocated(&vma->node))
		goto destroy;

	GEM_BUG_ON(obj->bind_count == 0);
	GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));

	if (i915_vma_is_map_and_fenceable(vma)) {
		/* release the fence reg _after_ flushing */
		ret = i915_vma_put_fence(vma);
		if (ret)
			return ret;

		/* Force a pagefault for domain tracking on next user access */
		i915_gem_release_mmap(obj);

		__i915_vma_iounmap(vma);
		vma->flags &= ~I915_VMA_CAN_FENCE;
	}

	if (likely(!vma->vm->closed)) {
		trace_i915_vma_unbind(vma);
		vma->vm->unbind_vma(vma);
	}
	vma->flags &= ~(I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);

	drm_mm_remove_node(&vma->node);
	list_move_tail(&vma->vm_link, &vma->vm->unbound_list);

	if (vma->pages != obj->mm.pages) {
		GEM_BUG_ON(!vma->pages);
		sg_free_table(vma->pages);
		kfree(vma->pages);
	}
	vma->pages = NULL;

	/* Since the unbound list is global, only move to that list if
	 * no more VMAs exist. */
	if (--obj->bind_count == 0)
		list_move_tail(&obj->global_link,
			       &to_i915(obj->base.dev)->mm.unbound_list);

	/* And finally now the object is completely decoupled from this vma,
	 * we can drop its hold on the backing storage and allow it to be
	 * reaped by the shrinker.
	 */
	i915_gem_object_unpin_pages(obj);

destroy:
	if (unlikely(i915_vma_is_closed(vma)))
		i915_vma_destroy(vma);

	return 0;
}