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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 "i915_vma.h"
26
27#include "i915_drv.h"
28#include "intel_ringbuffer.h"
29#include "intel_frontbuffer.h"
30
31#include <drm/drm_gem.h>
32
33static void
34i915_vma_retire(struct i915_gem_active *active,
35 struct drm_i915_gem_request *rq)
36{
37 const unsigned int idx = rq->engine->id;
38 struct i915_vma *vma =
39 container_of(active, struct i915_vma, last_read[idx]);
40 struct drm_i915_gem_object *obj = vma->obj;
41
42 GEM_BUG_ON(!i915_vma_has_active_engine(vma, idx));
43
44 i915_vma_clear_active(vma, idx);
45 if (i915_vma_is_active(vma))
46 return;
47
48 list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
49 if (unlikely(i915_vma_is_closed(vma) && !i915_vma_is_pinned(vma)))
50 WARN_ON(i915_vma_unbind(vma));
51
52 GEM_BUG_ON(!i915_gem_object_is_active(obj));
53 if (--obj->active_count)
54 return;
55
56 /* Bump our place on the bound list to keep it roughly in LRU order
57 * so that we don't steal from recently used but inactive objects
58 * (unless we are forced to ofc!)
59 */
60 if (obj->bind_count)
61 list_move_tail(&obj->global_link, &rq->i915->mm.bound_list);
62
63 obj->mm.dirty = true; /* be paranoid */
64
65 if (i915_gem_object_has_active_reference(obj)) {
66 i915_gem_object_clear_active_reference(obj);
67 i915_gem_object_put(obj);
68 }
69}
70
71static struct i915_vma *
72__i915_vma_create(struct drm_i915_gem_object *obj,
73 struct i915_address_space *vm,
74 const struct i915_ggtt_view *view)
75{
76 struct i915_vma *vma;
77 struct rb_node *rb, **p;
78 int i;
79
80 GEM_BUG_ON(vm->closed);
81
82 vma = kmem_cache_zalloc(to_i915(obj->base.dev)->vmas, GFP_KERNEL);
83 if (vma == NULL)
84 return ERR_PTR(-ENOMEM);
85
86 INIT_LIST_HEAD(&vma->exec_list);
87 for (i = 0; i < ARRAY_SIZE(vma->last_read); i++)
88 init_request_active(&vma->last_read[i], i915_vma_retire);
89 init_request_active(&vma->last_fence, NULL);
90 list_add(&vma->vm_link, &vm->unbound_list);
91 vma->vm = vm;
92 vma->obj = obj;
93 vma->size = obj->base.size;
94
95 if (view) {
96 vma->ggtt_view = *view;
97 if (view->type == I915_GGTT_VIEW_PARTIAL) {
98 vma->size = view->params.partial.size;
99 vma->size <<= PAGE_SHIFT;
100 } else if (view->type == I915_GGTT_VIEW_ROTATED) {
101 vma->size =
102 intel_rotation_info_size(&view->params.rotated);
103 vma->size <<= PAGE_SHIFT;
104 }
105 }
106
107 if (i915_is_ggtt(vm)) {
108 vma->flags |= I915_VMA_GGTT;
109 list_add(&vma->obj_link, &obj->vma_list);
110 } else {
111 i915_ppgtt_get(i915_vm_to_ppgtt(vm));
112 list_add_tail(&vma->obj_link, &obj->vma_list);
113 }
114
115 rb = NULL;
116 p = &obj->vma_tree.rb_node;
117 while (*p) {
118 struct i915_vma *pos;
119
120 rb = *p;
121 pos = rb_entry(rb, struct i915_vma, obj_node);
122 if (i915_vma_compare(pos, vm, view) < 0)
123 p = &rb->rb_right;
124 else
125 p = &rb->rb_left;
126 }
127 rb_link_node(&vma->obj_node, rb, p);
128 rb_insert_color(&vma->obj_node, &obj->vma_tree);
129
130 return vma;
131}
132
133struct i915_vma *
134i915_vma_create(struct drm_i915_gem_object *obj,
135 struct i915_address_space *vm,
136 const struct i915_ggtt_view *view)
137{
138 lockdep_assert_held(&obj->base.dev->struct_mutex);
139 GEM_BUG_ON(view && !i915_is_ggtt(vm));
140 GEM_BUG_ON(i915_gem_obj_to_vma(obj, vm, view));
141
142 return __i915_vma_create(obj, vm, view);
143}
144
145/**
146 * i915_vma_bind - Sets up PTEs for an VMA in it's corresponding address space.
147 * @vma: VMA to map
148 * @cache_level: mapping cache level
149 * @flags: flags like global or local mapping
150 *
151 * DMA addresses are taken from the scatter-gather table of this object (or of
152 * this VMA in case of non-default GGTT views) and PTE entries set up.
153 * Note that DMA addresses are also the only part of the SG table we care about.
154 */
155int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
156 u32 flags)
157{
158 u32 bind_flags;
159 u32 vma_flags;
160 int ret;
161
162 if (WARN_ON(flags == 0))
163 return -EINVAL;
164
165 bind_flags = 0;
166 if (flags & PIN_GLOBAL)
167 bind_flags |= I915_VMA_GLOBAL_BIND;
168 if (flags & PIN_USER)
169 bind_flags |= I915_VMA_LOCAL_BIND;
170
171 vma_flags = vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);
172 if (flags & PIN_UPDATE)
173 bind_flags |= vma_flags;
174 else
175 bind_flags &= ~vma_flags;
176 if (bind_flags == 0)
177 return 0;
178
179 if (vma_flags == 0 && vma->vm->allocate_va_range) {
180 trace_i915_va_alloc(vma);
181 ret = vma->vm->allocate_va_range(vma->vm,
182 vma->node.start,
183 vma->node.size);
184 if (ret)
185 return ret;
186 }
187
188 trace_i915_vma_bind(vma, bind_flags);
189 ret = vma->vm->bind_vma(vma, cache_level, bind_flags);
190 if (ret)
191 return ret;
192
193 vma->flags |= bind_flags;
194 return 0;
195}
196
197void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
198{
199 void __iomem *ptr;
200
201 /* Access through the GTT requires the device to be awake. */
202 assert_rpm_wakelock_held(to_i915(vma->vm->dev));
203
204 lockdep_assert_held(&vma->vm->dev->struct_mutex);
205 if (WARN_ON(!i915_vma_is_map_and_fenceable(vma)))
206 return IO_ERR_PTR(-ENODEV);
207
208 GEM_BUG_ON(!i915_vma_is_ggtt(vma));
209 GEM_BUG_ON((vma->flags & I915_VMA_GLOBAL_BIND) == 0);
210
211 ptr = vma->iomap;
212 if (ptr == NULL) {
213 ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->mappable,
214 vma->node.start,
215 vma->node.size);
216 if (ptr == NULL)
217 return IO_ERR_PTR(-ENOMEM);
218
219 vma->iomap = ptr;
220 }
221
222 __i915_vma_pin(vma);
223 return ptr;
224}
225
226void i915_vma_unpin_and_release(struct i915_vma **p_vma)
227{
228 struct i915_vma *vma;
229 struct drm_i915_gem_object *obj;
230
231 vma = fetch_and_zero(p_vma);
232 if (!vma)
233 return;
234
235 obj = vma->obj;
236
237 i915_vma_unpin(vma);
238 i915_vma_close(vma);
239
240 __i915_gem_object_release_unless_active(obj);
241}
242
243bool
244i915_vma_misplaced(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
245{
246 if (!drm_mm_node_allocated(&vma->node))
247 return false;
248
249 if (vma->node.size < size)
250 return true;
251
252 if (alignment && vma->node.start & (alignment - 1))
253 return true;
254
255 if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
256 return true;
257
258 if (flags & PIN_OFFSET_BIAS &&
259 vma->node.start < (flags & PIN_OFFSET_MASK))
260 return true;
261
262 if (flags & PIN_OFFSET_FIXED &&
263 vma->node.start != (flags & PIN_OFFSET_MASK))
264 return true;
265
266 return false;
267}
268
269void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
270{
271 struct drm_i915_gem_object *obj = vma->obj;
272 struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
273 bool mappable, fenceable;
274 u32 fence_size, fence_alignment;
275
276 fence_size = i915_gem_get_ggtt_size(dev_priv,
277 vma->size,
278 i915_gem_object_get_tiling(obj));
279 fence_alignment = i915_gem_get_ggtt_alignment(dev_priv,
280 vma->size,
281 i915_gem_object_get_tiling(obj),
282 true);
283
284 fenceable = (vma->node.size == fence_size &&
285 (vma->node.start & (fence_alignment - 1)) == 0);
286
287 mappable = (vma->node.start + fence_size <=
288 dev_priv->ggtt.mappable_end);
289
290 /*
291 * Explicitly disable for rotated VMA since the display does not
292 * need the fence and the VMA is not accessible to other users.
293 */
294 if (mappable && fenceable &&
295 vma->ggtt_view.type != I915_GGTT_VIEW_ROTATED)
296 vma->flags |= I915_VMA_CAN_FENCE;
297 else
298 vma->flags &= ~I915_VMA_CAN_FENCE;
299}
300
301bool i915_gem_valid_gtt_space(struct i915_vma *vma,
302 unsigned long cache_level)
303{
304 struct drm_mm_node *gtt_space = &vma->node;
305 struct drm_mm_node *other;
306
307 /*
308 * On some machines we have to be careful when putting differing types
309 * of snoopable memory together to avoid the prefetcher crossing memory
310 * domains and dying. During vm initialisation, we decide whether or not
311 * these constraints apply and set the drm_mm.color_adjust
312 * appropriately.
313 */
314 if (vma->vm->mm.color_adjust == NULL)
315 return true;
316
317 if (!drm_mm_node_allocated(gtt_space))
318 return true;
319
320 if (list_empty(>t_space->node_list))
321 return true;
322
323 other = list_entry(gtt_space->node_list.prev, struct drm_mm_node, node_list);
324 if (other->allocated && !other->hole_follows && other->color != cache_level)
325 return false;
326
327 other = list_entry(gtt_space->node_list.next, struct drm_mm_node, node_list);
328 if (other->allocated && !gtt_space->hole_follows && other->color != cache_level)
329 return false;
330
331 return true;
332}
333
334/**
335 * i915_vma_insert - finds a slot for the vma in its address space
336 * @vma: the vma
337 * @size: requested size in bytes (can be larger than the VMA)
338 * @alignment: required alignment
339 * @flags: mask of PIN_* flags to use
340 *
341 * First we try to allocate some free space that meets the requirements for
342 * the VMA. Failiing that, if the flags permit, it will evict an old VMA,
343 * preferrably the oldest idle entry to make room for the new VMA.
344 *
345 * Returns:
346 * 0 on success, negative error code otherwise.
347 */
348static int
349i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
350{
351 struct drm_i915_private *dev_priv = to_i915(vma->vm->dev);
352 struct drm_i915_gem_object *obj = vma->obj;
353 u64 start, end;
354 int ret;
355
356 GEM_BUG_ON(vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
357 GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
358
359 size = max(size, vma->size);
360 if (flags & PIN_MAPPABLE)
361 size = i915_gem_get_ggtt_size(dev_priv, size,
362 i915_gem_object_get_tiling(obj));
363
364 alignment = max(max(alignment, vma->display_alignment),
365 i915_gem_get_ggtt_alignment(dev_priv, size,
366 i915_gem_object_get_tiling(obj),
367 flags & PIN_MAPPABLE));
368
369 start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
370
371 end = vma->vm->total;
372 if (flags & PIN_MAPPABLE)
373 end = min_t(u64, end, dev_priv->ggtt.mappable_end);
374 if (flags & PIN_ZONE_4G)
375 end = min_t(u64, end, (1ULL << 32) - PAGE_SIZE);
376
377 /* If binding the object/GGTT view requires more space than the entire
378 * aperture has, reject it early before evicting everything in a vain
379 * attempt to find space.
380 */
381 if (size > end) {
382 DRM_DEBUG("Attempting to bind an object larger than the aperture: request=%llu [object=%zd] > %s aperture=%llu\n",
383 size, obj->base.size,
384 flags & PIN_MAPPABLE ? "mappable" : "total",
385 end);
386 return -E2BIG;
387 }
388
389 ret = i915_gem_object_pin_pages(obj);
390 if (ret)
391 return ret;
392
393 if (flags & PIN_OFFSET_FIXED) {
394 u64 offset = flags & PIN_OFFSET_MASK;
395 if (offset & (alignment - 1) || offset > end - size) {
396 ret = -EINVAL;
397 goto err_unpin;
398 }
399
400 vma->node.start = offset;
401 vma->node.size = size;
402 vma->node.color = obj->cache_level;
403 ret = drm_mm_reserve_node(&vma->vm->mm, &vma->node);
404 if (ret) {
405 ret = i915_gem_evict_for_vma(vma);
406 if (ret == 0)
407 ret = drm_mm_reserve_node(&vma->vm->mm, &vma->node);
408 if (ret)
409 goto err_unpin;
410 }
411 } else {
412 u32 search_flag, alloc_flag;
413
414 if (flags & PIN_HIGH) {
415 search_flag = DRM_MM_SEARCH_BELOW;
416 alloc_flag = DRM_MM_CREATE_TOP;
417 } else {
418 search_flag = DRM_MM_SEARCH_DEFAULT;
419 alloc_flag = DRM_MM_CREATE_DEFAULT;
420 }
421
422 /* We only allocate in PAGE_SIZE/GTT_PAGE_SIZE (4096) chunks,
423 * so we know that we always have a minimum alignment of 4096.
424 * The drm_mm range manager is optimised to return results
425 * with zero alignment, so where possible use the optimal
426 * path.
427 */
428 if (alignment <= 4096)
429 alignment = 0;
430
431search_free:
432 ret = drm_mm_insert_node_in_range_generic(&vma->vm->mm,
433 &vma->node,
434 size, alignment,
435 obj->cache_level,
436 start, end,
437 search_flag,
438 alloc_flag);
439 if (ret) {
440 ret = i915_gem_evict_something(vma->vm, size, alignment,
441 obj->cache_level,
442 start, end,
443 flags);
444 if (ret == 0)
445 goto search_free;
446
447 goto err_unpin;
448 }
449
450 GEM_BUG_ON(vma->node.start < start);
451 GEM_BUG_ON(vma->node.start + vma->node.size > end);
452 }
453 GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level));
454
455 list_move_tail(&obj->global_link, &dev_priv->mm.bound_list);
456 list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
457 obj->bind_count++;
458 GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);
459
460 return 0;
461
462err_unpin:
463 i915_gem_object_unpin_pages(obj);
464 return ret;
465}
466
467int __i915_vma_do_pin(struct i915_vma *vma,
468 u64 size, u64 alignment, u64 flags)
469{
470 unsigned int bound = vma->flags;
471 int ret;
472
473 lockdep_assert_held(&vma->vm->dev->struct_mutex);
474 GEM_BUG_ON((flags & (PIN_GLOBAL | PIN_USER)) == 0);
475 GEM_BUG_ON((flags & PIN_GLOBAL) && !i915_vma_is_ggtt(vma));
476
477 if (WARN_ON(bound & I915_VMA_PIN_OVERFLOW)) {
478 ret = -EBUSY;
479 goto err;
480 }
481
482 if ((bound & I915_VMA_BIND_MASK) == 0) {
483 ret = i915_vma_insert(vma, size, alignment, flags);
484 if (ret)
485 goto err;
486 }
487
488 ret = i915_vma_bind(vma, vma->obj->cache_level, flags);
489 if (ret)
490 goto err;
491
492 if ((bound ^ vma->flags) & I915_VMA_GLOBAL_BIND)
493 __i915_vma_set_map_and_fenceable(vma);
494
495 GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));
496 return 0;
497
498err:
499 __i915_vma_unpin(vma);
500 return ret;
501}
502
503void i915_vma_destroy(struct i915_vma *vma)
504{
505 GEM_BUG_ON(vma->node.allocated);
506 GEM_BUG_ON(i915_vma_is_active(vma));
507 GEM_BUG_ON(!i915_vma_is_closed(vma));
508 GEM_BUG_ON(vma->fence);
509
510 list_del(&vma->vm_link);
511 if (!i915_vma_is_ggtt(vma))
512 i915_ppgtt_put(i915_vm_to_ppgtt(vma->vm));
513
514 kmem_cache_free(to_i915(vma->obj->base.dev)->vmas, vma);
515}
516
517void i915_vma_close(struct i915_vma *vma)
518{
519 GEM_BUG_ON(i915_vma_is_closed(vma));
520 vma->flags |= I915_VMA_CLOSED;
521
522 list_del(&vma->obj_link);
523 rb_erase(&vma->obj_node, &vma->obj->vma_tree);
524
525 if (!i915_vma_is_active(vma) && !i915_vma_is_pinned(vma))
526 WARN_ON(i915_vma_unbind(vma));
527}
528
529static void __i915_vma_iounmap(struct i915_vma *vma)
530{
531 GEM_BUG_ON(i915_vma_is_pinned(vma));
532
533 if (vma->iomap == NULL)
534 return;
535
536 io_mapping_unmap(vma->iomap);
537 vma->iomap = NULL;
538}
539
540int i915_vma_unbind(struct i915_vma *vma)
541{
542 struct drm_i915_gem_object *obj = vma->obj;
543 unsigned long active;
544 int ret;
545
546 lockdep_assert_held(&obj->base.dev->struct_mutex);
547
548 /* First wait upon any activity as retiring the request may
549 * have side-effects such as unpinning or even unbinding this vma.
550 */
551 active = i915_vma_get_active(vma);
552 if (active) {
553 int idx;
554
555 /* When a closed VMA is retired, it is unbound - eek.
556 * In order to prevent it from being recursively closed,
557 * take a pin on the vma so that the second unbind is
558 * aborted.
559 *
560 * Even more scary is that the retire callback may free
561 * the object (last active vma). To prevent the explosion
562 * we defer the actual object free to a worker that can
563 * only proceed once it acquires the struct_mutex (which
564 * we currently hold, therefore it cannot free this object
565 * before we are finished).
566 */
567 __i915_vma_pin(vma);
568
569 for_each_active(active, idx) {
570 ret = i915_gem_active_retire(&vma->last_read[idx],
571 &vma->vm->dev->struct_mutex);
572 if (ret)
573 break;
574 }
575
576 __i915_vma_unpin(vma);
577 if (ret)
578 return ret;
579
580 GEM_BUG_ON(i915_vma_is_active(vma));
581 }
582
583 if (i915_vma_is_pinned(vma))
584 return -EBUSY;
585
586 if (!drm_mm_node_allocated(&vma->node))
587 goto destroy;
588
589 GEM_BUG_ON(obj->bind_count == 0);
590 GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
591
592 if (i915_vma_is_map_and_fenceable(vma)) {
593 /* release the fence reg _after_ flushing */
594 ret = i915_vma_put_fence(vma);
595 if (ret)
596 return ret;
597
598 /* Force a pagefault for domain tracking on next user access */
599 i915_gem_release_mmap(obj);
600
601 __i915_vma_iounmap(vma);
602 vma->flags &= ~I915_VMA_CAN_FENCE;
603 }
604
605 if (likely(!vma->vm->closed)) {
606 trace_i915_vma_unbind(vma);
607 vma->vm->unbind_vma(vma);
608 }
609 vma->flags &= ~(I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);
610
611 drm_mm_remove_node(&vma->node);
612 list_move_tail(&vma->vm_link, &vma->vm->unbound_list);
613
614 if (vma->pages != obj->mm.pages) {
615 GEM_BUG_ON(!vma->pages);
616 sg_free_table(vma->pages);
617 kfree(vma->pages);
618 }
619 vma->pages = NULL;
620
621 /* Since the unbound list is global, only move to that list if
622 * no more VMAs exist. */
623 if (--obj->bind_count == 0)
624 list_move_tail(&obj->global_link,
625 &to_i915(obj->base.dev)->mm.unbound_list);
626
627 /* And finally now the object is completely decoupled from this vma,
628 * we can drop its hold on the backing storage and allow it to be
629 * reaped by the shrinker.
630 */
631 i915_gem_object_unpin_pages(obj);
632
633destroy:
634 if (unlikely(i915_vma_is_closed(vma)))
635 i915_vma_destroy(vma);
636
637 return 0;
638}
639