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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2021 Intel Corporation
4 */
5
6#include <linux/shmem_fs.h>
7
8#include <drm/ttm/ttm_placement.h>
9#include <drm/ttm/ttm_tt.h>
10#include <drm/drm_buddy.h>
11
12#include "i915_drv.h"
13#include "i915_ttm_buddy_manager.h"
14#include "intel_memory_region.h"
15#include "intel_region_ttm.h"
16
17#include "gem/i915_gem_mman.h"
18#include "gem/i915_gem_object.h"
19#include "gem/i915_gem_region.h"
20#include "gem/i915_gem_ttm.h"
21#include "gem/i915_gem_ttm_move.h"
22#include "gem/i915_gem_ttm_pm.h"
23#include "gt/intel_gpu_commands.h"
24
25#define I915_TTM_PRIO_PURGE 0
26#define I915_TTM_PRIO_NO_PAGES 1
27#define I915_TTM_PRIO_HAS_PAGES 2
28#define I915_TTM_PRIO_NEEDS_CPU_ACCESS 3
29
30/*
31 * Size of struct ttm_place vector in on-stack struct ttm_placement allocs
32 */
33#define I915_TTM_MAX_PLACEMENTS INTEL_REGION_UNKNOWN
34
35/**
36 * struct i915_ttm_tt - TTM page vector with additional private information
37 * @ttm: The base TTM page vector.
38 * @dev: The struct device used for dma mapping and unmapping.
39 * @cached_rsgt: The cached scatter-gather table.
40 * @is_shmem: Set if using shmem.
41 * @filp: The shmem file, if using shmem backend.
42 *
43 * Note that DMA may be going on right up to the point where the page-
44 * vector is unpopulated in delayed destroy. Hence keep the
45 * scatter-gather table mapped and cached up to that point. This is
46 * different from the cached gem object io scatter-gather table which
47 * doesn't have an associated dma mapping.
48 */
49struct i915_ttm_tt {
50 struct ttm_tt ttm;
51 struct device *dev;
52 struct i915_refct_sgt cached_rsgt;
53
54 bool is_shmem;
55 struct file *filp;
56};
57
58static const struct ttm_place sys_placement_flags = {
59 .fpfn = 0,
60 .lpfn = 0,
61 .mem_type = I915_PL_SYSTEM,
62 .flags = 0,
63};
64
65static struct ttm_placement i915_sys_placement = {
66 .num_placement = 1,
67 .placement = &sys_placement_flags,
68};
69
70/**
71 * i915_ttm_sys_placement - Return the struct ttm_placement to be
72 * used for an object in system memory.
73 *
74 * Rather than making the struct extern, use this
75 * function.
76 *
77 * Return: A pointer to a static variable for sys placement.
78 */
79struct ttm_placement *i915_ttm_sys_placement(void)
80{
81 return &i915_sys_placement;
82}
83
84static int i915_ttm_err_to_gem(int err)
85{
86 /* Fastpath */
87 if (likely(!err))
88 return 0;
89
90 switch (err) {
91 case -EBUSY:
92 /*
93 * TTM likes to convert -EDEADLK to -EBUSY, and wants us to
94 * restart the operation, since we don't record the contending
95 * lock. We use -EAGAIN to restart.
96 */
97 return -EAGAIN;
98 case -ENOSPC:
99 /*
100 * Memory type / region is full, and we can't evict.
101 * Except possibly system, that returns -ENOMEM;
102 */
103 return -ENXIO;
104 default:
105 break;
106 }
107
108 return err;
109}
110
111static enum ttm_caching
112i915_ttm_select_tt_caching(const struct drm_i915_gem_object *obj)
113{
114 /*
115 * Objects only allowed in system get cached cpu-mappings, or when
116 * evicting lmem-only buffers to system for swapping. Other objects get
117 * WC mapping for now. Even if in system.
118 */
119 if (obj->mm.n_placements <= 1)
120 return ttm_cached;
121
122 return ttm_write_combined;
123}
124
125static void
126i915_ttm_place_from_region(const struct intel_memory_region *mr,
127 struct ttm_place *place,
128 resource_size_t offset,
129 resource_size_t size,
130 unsigned int flags)
131{
132 memset(place, 0, sizeof(*place));
133 place->mem_type = intel_region_to_ttm_type(mr);
134
135 if (mr->type == INTEL_MEMORY_SYSTEM)
136 return;
137
138 if (flags & I915_BO_ALLOC_CONTIGUOUS)
139 place->flags |= TTM_PL_FLAG_CONTIGUOUS;
140 if (offset != I915_BO_INVALID_OFFSET) {
141 WARN_ON(overflows_type(offset >> PAGE_SHIFT, place->fpfn));
142 place->fpfn = offset >> PAGE_SHIFT;
143 WARN_ON(overflows_type(place->fpfn + (size >> PAGE_SHIFT), place->lpfn));
144 place->lpfn = place->fpfn + (size >> PAGE_SHIFT);
145 } else if (resource_size(&mr->io) && resource_size(&mr->io) < mr->total) {
146 if (flags & I915_BO_ALLOC_GPU_ONLY) {
147 place->flags |= TTM_PL_FLAG_TOPDOWN;
148 } else {
149 place->fpfn = 0;
150 WARN_ON(overflows_type(resource_size(&mr->io) >> PAGE_SHIFT, place->lpfn));
151 place->lpfn = resource_size(&mr->io) >> PAGE_SHIFT;
152 }
153 }
154}
155
156static void
157i915_ttm_placement_from_obj(const struct drm_i915_gem_object *obj,
158 struct ttm_place *places,
159 struct ttm_placement *placement)
160{
161 unsigned int num_allowed = obj->mm.n_placements;
162 unsigned int flags = obj->flags;
163 unsigned int i;
164
165 i915_ttm_place_from_region(num_allowed ? obj->mm.placements[0] :
166 obj->mm.region, &places[0], obj->bo_offset,
167 obj->base.size, flags);
168 places[0].flags |= TTM_PL_FLAG_DESIRED;
169
170 /* Cache this on object? */
171 for (i = 0; i < num_allowed; ++i) {
172 i915_ttm_place_from_region(obj->mm.placements[i],
173 &places[i + 1], obj->bo_offset,
174 obj->base.size, flags);
175 places[i + 1].flags |= TTM_PL_FLAG_FALLBACK;
176 }
177
178 placement->num_placement = num_allowed + 1;
179 placement->placement = places;
180}
181
182static int i915_ttm_tt_shmem_populate(struct ttm_device *bdev,
183 struct ttm_tt *ttm,
184 struct ttm_operation_ctx *ctx)
185{
186 struct drm_i915_private *i915 = container_of(bdev, typeof(*i915), bdev);
187 struct intel_memory_region *mr = i915->mm.regions[INTEL_MEMORY_SYSTEM];
188 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
189 const unsigned int max_segment = i915_sg_segment_size(i915->drm.dev);
190 const size_t size = (size_t)ttm->num_pages << PAGE_SHIFT;
191 struct file *filp = i915_tt->filp;
192 struct sgt_iter sgt_iter;
193 struct sg_table *st;
194 struct page *page;
195 unsigned long i;
196 int err;
197
198 if (!filp) {
199 struct address_space *mapping;
200 gfp_t mask;
201
202 filp = shmem_file_setup("i915-shmem-tt", size, VM_NORESERVE);
203 if (IS_ERR(filp))
204 return PTR_ERR(filp);
205
206 mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
207
208 mapping = filp->f_mapping;
209 mapping_set_gfp_mask(mapping, mask);
210 GEM_BUG_ON(!(mapping_gfp_mask(mapping) & __GFP_RECLAIM));
211
212 i915_tt->filp = filp;
213 }
214
215 st = &i915_tt->cached_rsgt.table;
216 err = shmem_sg_alloc_table(i915, st, size, mr, filp->f_mapping,
217 max_segment);
218 if (err)
219 return err;
220
221 err = dma_map_sgtable(i915_tt->dev, st, DMA_BIDIRECTIONAL,
222 DMA_ATTR_SKIP_CPU_SYNC);
223 if (err)
224 goto err_free_st;
225
226 i = 0;
227 for_each_sgt_page(page, sgt_iter, st)
228 ttm->pages[i++] = page;
229
230 if (ttm->page_flags & TTM_TT_FLAG_SWAPPED)
231 ttm->page_flags &= ~TTM_TT_FLAG_SWAPPED;
232
233 return 0;
234
235err_free_st:
236 shmem_sg_free_table(st, filp->f_mapping, false, false);
237
238 return err;
239}
240
241static void i915_ttm_tt_shmem_unpopulate(struct ttm_tt *ttm)
242{
243 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
244 bool backup = ttm->page_flags & TTM_TT_FLAG_SWAPPED;
245 struct sg_table *st = &i915_tt->cached_rsgt.table;
246
247 shmem_sg_free_table(st, file_inode(i915_tt->filp)->i_mapping,
248 backup, backup);
249}
250
251static void i915_ttm_tt_release(struct kref *ref)
252{
253 struct i915_ttm_tt *i915_tt =
254 container_of(ref, typeof(*i915_tt), cached_rsgt.kref);
255 struct sg_table *st = &i915_tt->cached_rsgt.table;
256
257 GEM_WARN_ON(st->sgl);
258
259 kfree(i915_tt);
260}
261
262static const struct i915_refct_sgt_ops tt_rsgt_ops = {
263 .release = i915_ttm_tt_release
264};
265
266static struct ttm_tt *i915_ttm_tt_create(struct ttm_buffer_object *bo,
267 uint32_t page_flags)
268{
269 struct drm_i915_private *i915 = container_of(bo->bdev, typeof(*i915),
270 bdev);
271 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
272 unsigned long ccs_pages = 0;
273 enum ttm_caching caching;
274 struct i915_ttm_tt *i915_tt;
275 int ret;
276
277 if (i915_ttm_is_ghost_object(bo))
278 return NULL;
279
280 i915_tt = kzalloc(sizeof(*i915_tt), GFP_KERNEL);
281 if (!i915_tt)
282 return NULL;
283
284 if (obj->flags & I915_BO_ALLOC_CPU_CLEAR && (!bo->resource ||
285 ttm_manager_type(bo->bdev, bo->resource->mem_type)->use_tt))
286 page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
287
288 caching = i915_ttm_select_tt_caching(obj);
289 if (i915_gem_object_is_shrinkable(obj) && caching == ttm_cached) {
290 page_flags |= TTM_TT_FLAG_EXTERNAL |
291 TTM_TT_FLAG_EXTERNAL_MAPPABLE;
292 i915_tt->is_shmem = true;
293 }
294
295 if (i915_gem_object_needs_ccs_pages(obj))
296 ccs_pages = DIV_ROUND_UP(DIV_ROUND_UP(bo->base.size,
297 NUM_BYTES_PER_CCS_BYTE),
298 PAGE_SIZE);
299
300 ret = ttm_tt_init(&i915_tt->ttm, bo, page_flags, caching, ccs_pages);
301 if (ret)
302 goto err_free;
303
304 __i915_refct_sgt_init(&i915_tt->cached_rsgt, bo->base.size,
305 &tt_rsgt_ops);
306
307 i915_tt->dev = obj->base.dev->dev;
308
309 return &i915_tt->ttm;
310
311err_free:
312 kfree(i915_tt);
313 return NULL;
314}
315
316static int i915_ttm_tt_populate(struct ttm_device *bdev,
317 struct ttm_tt *ttm,
318 struct ttm_operation_ctx *ctx)
319{
320 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
321
322 if (i915_tt->is_shmem)
323 return i915_ttm_tt_shmem_populate(bdev, ttm, ctx);
324
325 return ttm_pool_alloc(&bdev->pool, ttm, ctx);
326}
327
328static void i915_ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
329{
330 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
331 struct sg_table *st = &i915_tt->cached_rsgt.table;
332
333 if (st->sgl)
334 dma_unmap_sgtable(i915_tt->dev, st, DMA_BIDIRECTIONAL, 0);
335
336 if (i915_tt->is_shmem) {
337 i915_ttm_tt_shmem_unpopulate(ttm);
338 } else {
339 sg_free_table(st);
340 ttm_pool_free(&bdev->pool, ttm);
341 }
342}
343
344static void i915_ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
345{
346 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
347
348 if (i915_tt->filp)
349 fput(i915_tt->filp);
350
351 ttm_tt_fini(ttm);
352 i915_refct_sgt_put(&i915_tt->cached_rsgt);
353}
354
355static bool i915_ttm_eviction_valuable(struct ttm_buffer_object *bo,
356 const struct ttm_place *place)
357{
358 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
359
360 if (i915_ttm_is_ghost_object(bo))
361 return false;
362
363 /*
364 * EXTERNAL objects should never be swapped out by TTM, instead we need
365 * to handle that ourselves. TTM will already skip such objects for us,
366 * but we would like to avoid grabbing locks for no good reason.
367 */
368 if (bo->ttm && bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL)
369 return false;
370
371 /* Will do for now. Our pinned objects are still on TTM's LRU lists */
372 if (!i915_gem_object_evictable(obj))
373 return false;
374
375 return ttm_bo_eviction_valuable(bo, place);
376}
377
378static void i915_ttm_evict_flags(struct ttm_buffer_object *bo,
379 struct ttm_placement *placement)
380{
381 *placement = i915_sys_placement;
382}
383
384/**
385 * i915_ttm_free_cached_io_rsgt - Free object cached LMEM information
386 * @obj: The GEM object
387 * This function frees any LMEM-related information that is cached on
388 * the object. For example the radix tree for fast page lookup and the
389 * cached refcounted sg-table
390 */
391void i915_ttm_free_cached_io_rsgt(struct drm_i915_gem_object *obj)
392{
393 struct radix_tree_iter iter;
394 void __rcu **slot;
395
396 if (!obj->ttm.cached_io_rsgt)
397 return;
398
399 rcu_read_lock();
400 radix_tree_for_each_slot(slot, &obj->ttm.get_io_page.radix, &iter, 0)
401 radix_tree_delete(&obj->ttm.get_io_page.radix, iter.index);
402 rcu_read_unlock();
403
404 i915_refct_sgt_put(obj->ttm.cached_io_rsgt);
405 obj->ttm.cached_io_rsgt = NULL;
406}
407
408/**
409 * i915_ttm_purge - Clear an object of its memory
410 * @obj: The object
411 *
412 * This function is called to clear an object of it's memory when it is
413 * marked as not needed anymore.
414 *
415 * Return: 0 on success, negative error code on failure.
416 */
417int i915_ttm_purge(struct drm_i915_gem_object *obj)
418{
419 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
420 struct i915_ttm_tt *i915_tt =
421 container_of(bo->ttm, typeof(*i915_tt), ttm);
422 struct ttm_operation_ctx ctx = {
423 .interruptible = true,
424 .no_wait_gpu = false,
425 };
426 struct ttm_placement place = {};
427 int ret;
428
429 if (obj->mm.madv == __I915_MADV_PURGED)
430 return 0;
431
432 ret = ttm_bo_validate(bo, &place, &ctx);
433 if (ret)
434 return ret;
435
436 if (bo->ttm && i915_tt->filp) {
437 /*
438 * The below fput(which eventually calls shmem_truncate) might
439 * be delayed by worker, so when directly called to purge the
440 * pages(like by the shrinker) we should try to be more
441 * aggressive and release the pages immediately.
442 */
443 shmem_truncate_range(file_inode(i915_tt->filp),
444 0, (loff_t)-1);
445 fput(fetch_and_zero(&i915_tt->filp));
446 }
447
448 obj->write_domain = 0;
449 obj->read_domains = 0;
450 i915_ttm_adjust_gem_after_move(obj);
451 i915_ttm_free_cached_io_rsgt(obj);
452 obj->mm.madv = __I915_MADV_PURGED;
453
454 return 0;
455}
456
457static int i915_ttm_shrink(struct drm_i915_gem_object *obj, unsigned int flags)
458{
459 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
460 struct i915_ttm_tt *i915_tt =
461 container_of(bo->ttm, typeof(*i915_tt), ttm);
462 struct ttm_operation_ctx ctx = {
463 .interruptible = true,
464 .no_wait_gpu = flags & I915_GEM_OBJECT_SHRINK_NO_GPU_WAIT,
465 };
466 struct ttm_placement place = {};
467 int ret;
468
469 if (!bo->ttm || i915_ttm_cpu_maps_iomem(bo->resource))
470 return 0;
471
472 GEM_BUG_ON(!i915_tt->is_shmem);
473
474 if (!i915_tt->filp)
475 return 0;
476
477 ret = ttm_bo_wait_ctx(bo, &ctx);
478 if (ret)
479 return ret;
480
481 switch (obj->mm.madv) {
482 case I915_MADV_DONTNEED:
483 return i915_ttm_purge(obj);
484 case __I915_MADV_PURGED:
485 return 0;
486 }
487
488 if (bo->ttm->page_flags & TTM_TT_FLAG_SWAPPED)
489 return 0;
490
491 bo->ttm->page_flags |= TTM_TT_FLAG_SWAPPED;
492 ret = ttm_bo_validate(bo, &place, &ctx);
493 if (ret) {
494 bo->ttm->page_flags &= ~TTM_TT_FLAG_SWAPPED;
495 return ret;
496 }
497
498 if (flags & I915_GEM_OBJECT_SHRINK_WRITEBACK)
499 __shmem_writeback(obj->base.size, i915_tt->filp->f_mapping);
500
501 return 0;
502}
503
504static void i915_ttm_delete_mem_notify(struct ttm_buffer_object *bo)
505{
506 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
507
508 /*
509 * This gets called twice by ttm, so long as we have a ttm resource or
510 * ttm_tt then we can still safely call this. Due to pipeline-gutting,
511 * we maybe have NULL bo->resource, but in that case we should always
512 * have a ttm alive (like if the pages are swapped out).
513 */
514 if ((bo->resource || bo->ttm) && !i915_ttm_is_ghost_object(bo)) {
515 __i915_gem_object_pages_fini(obj);
516 i915_ttm_free_cached_io_rsgt(obj);
517 }
518}
519
520static struct i915_refct_sgt *i915_ttm_tt_get_st(struct ttm_tt *ttm)
521{
522 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
523 struct sg_table *st;
524 int ret;
525
526 if (i915_tt->cached_rsgt.table.sgl)
527 return i915_refct_sgt_get(&i915_tt->cached_rsgt);
528
529 st = &i915_tt->cached_rsgt.table;
530 ret = sg_alloc_table_from_pages_segment(st,
531 ttm->pages, ttm->num_pages,
532 0, (unsigned long)ttm->num_pages << PAGE_SHIFT,
533 i915_sg_segment_size(i915_tt->dev), GFP_KERNEL);
534 if (ret) {
535 st->sgl = NULL;
536 return ERR_PTR(ret);
537 }
538
539 ret = dma_map_sgtable(i915_tt->dev, st, DMA_BIDIRECTIONAL, 0);
540 if (ret) {
541 sg_free_table(st);
542 return ERR_PTR(ret);
543 }
544
545 return i915_refct_sgt_get(&i915_tt->cached_rsgt);
546}
547
548/**
549 * i915_ttm_resource_get_st - Get a refcounted sg-table pointing to the
550 * resource memory
551 * @obj: The GEM object used for sg-table caching
552 * @res: The struct ttm_resource for which an sg-table is requested.
553 *
554 * This function returns a refcounted sg-table representing the memory
555 * pointed to by @res. If @res is the object's current resource it may also
556 * cache the sg_table on the object or attempt to access an already cached
557 * sg-table. The refcounted sg-table needs to be put when no-longer in use.
558 *
559 * Return: A valid pointer to a struct i915_refct_sgt or error pointer on
560 * failure.
561 */
562struct i915_refct_sgt *
563i915_ttm_resource_get_st(struct drm_i915_gem_object *obj,
564 struct ttm_resource *res)
565{
566 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
567 u32 page_alignment;
568
569 if (!i915_ttm_gtt_binds_lmem(res))
570 return i915_ttm_tt_get_st(bo->ttm);
571
572 page_alignment = bo->page_alignment << PAGE_SHIFT;
573 if (!page_alignment)
574 page_alignment = obj->mm.region->min_page_size;
575
576 /*
577 * If CPU mapping differs, we need to add the ttm_tt pages to
578 * the resulting st. Might make sense for GGTT.
579 */
580 GEM_WARN_ON(!i915_ttm_cpu_maps_iomem(res));
581 if (bo->resource == res) {
582 if (!obj->ttm.cached_io_rsgt) {
583 struct i915_refct_sgt *rsgt;
584
585 rsgt = intel_region_ttm_resource_to_rsgt(obj->mm.region,
586 res,
587 page_alignment);
588 if (IS_ERR(rsgt))
589 return rsgt;
590
591 obj->ttm.cached_io_rsgt = rsgt;
592 }
593 return i915_refct_sgt_get(obj->ttm.cached_io_rsgt);
594 }
595
596 return intel_region_ttm_resource_to_rsgt(obj->mm.region, res,
597 page_alignment);
598}
599
600static int i915_ttm_truncate(struct drm_i915_gem_object *obj)
601{
602 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
603 long err;
604
605 WARN_ON_ONCE(obj->mm.madv == I915_MADV_WILLNEED);
606
607 err = dma_resv_wait_timeout(bo->base.resv, DMA_RESV_USAGE_BOOKKEEP,
608 true, 15 * HZ);
609 if (err < 0)
610 return err;
611 if (err == 0)
612 return -EBUSY;
613
614 err = i915_ttm_move_notify(bo);
615 if (err)
616 return err;
617
618 return i915_ttm_purge(obj);
619}
620
621static void i915_ttm_swap_notify(struct ttm_buffer_object *bo)
622{
623 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
624 int ret;
625
626 if (i915_ttm_is_ghost_object(bo))
627 return;
628
629 ret = i915_ttm_move_notify(bo);
630 GEM_WARN_ON(ret);
631 GEM_WARN_ON(obj->ttm.cached_io_rsgt);
632 if (!ret && obj->mm.madv != I915_MADV_WILLNEED)
633 i915_ttm_purge(obj);
634}
635
636/**
637 * i915_ttm_resource_mappable - Return true if the ttm resource is CPU
638 * accessible.
639 * @res: The TTM resource to check.
640 *
641 * This is interesting on small-BAR systems where we may encounter lmem objects
642 * that can't be accessed via the CPU.
643 */
644bool i915_ttm_resource_mappable(struct ttm_resource *res)
645{
646 struct i915_ttm_buddy_resource *bman_res = to_ttm_buddy_resource(res);
647
648 if (!i915_ttm_cpu_maps_iomem(res))
649 return true;
650
651 return bman_res->used_visible_size == PFN_UP(bman_res->base.size);
652}
653
654static int i915_ttm_io_mem_reserve(struct ttm_device *bdev, struct ttm_resource *mem)
655{
656 struct drm_i915_gem_object *obj = i915_ttm_to_gem(mem->bo);
657 bool unknown_state;
658
659 if (i915_ttm_is_ghost_object(mem->bo))
660 return -EINVAL;
661
662 if (!kref_get_unless_zero(&obj->base.refcount))
663 return -EINVAL;
664
665 assert_object_held(obj);
666
667 unknown_state = i915_gem_object_has_unknown_state(obj);
668 i915_gem_object_put(obj);
669 if (unknown_state)
670 return -EINVAL;
671
672 if (!i915_ttm_cpu_maps_iomem(mem))
673 return 0;
674
675 if (!i915_ttm_resource_mappable(mem))
676 return -EINVAL;
677
678 mem->bus.caching = ttm_write_combined;
679 mem->bus.is_iomem = true;
680
681 return 0;
682}
683
684static unsigned long i915_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
685 unsigned long page_offset)
686{
687 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
688 struct scatterlist *sg;
689 unsigned long base;
690 unsigned int ofs;
691
692 GEM_BUG_ON(i915_ttm_is_ghost_object(bo));
693 GEM_WARN_ON(bo->ttm);
694
695 base = obj->mm.region->iomap.base - obj->mm.region->region.start;
696 sg = i915_gem_object_page_iter_get_sg(obj, &obj->ttm.get_io_page, page_offset, &ofs);
697
698 return ((base + sg_dma_address(sg)) >> PAGE_SHIFT) + ofs;
699}
700
701static int i915_ttm_access_memory(struct ttm_buffer_object *bo,
702 unsigned long offset, void *buf,
703 int len, int write)
704{
705 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
706 resource_size_t iomap = obj->mm.region->iomap.base -
707 obj->mm.region->region.start;
708 unsigned long page = offset >> PAGE_SHIFT;
709 unsigned long bytes_left = len;
710
711 /*
712 * TODO: For now just let it fail if the resource is non-mappable,
713 * otherwise we need to perform the memcpy from the gpu here, without
714 * interfering with the object (like moving the entire thing).
715 */
716 if (!i915_ttm_resource_mappable(bo->resource))
717 return -EIO;
718
719 offset -= page << PAGE_SHIFT;
720 do {
721 unsigned long bytes = min(bytes_left, PAGE_SIZE - offset);
722 void __iomem *ptr;
723 dma_addr_t daddr;
724
725 daddr = i915_gem_object_get_dma_address(obj, page);
726 ptr = ioremap_wc(iomap + daddr + offset, bytes);
727 if (!ptr)
728 return -EIO;
729
730 if (write)
731 memcpy_toio(ptr, buf, bytes);
732 else
733 memcpy_fromio(buf, ptr, bytes);
734 iounmap(ptr);
735
736 page++;
737 buf += bytes;
738 bytes_left -= bytes;
739 offset = 0;
740 } while (bytes_left);
741
742 return len;
743}
744
745/*
746 * All callbacks need to take care not to downcast a struct ttm_buffer_object
747 * without checking its subclass, since it might be a TTM ghost object.
748 */
749static struct ttm_device_funcs i915_ttm_bo_driver = {
750 .ttm_tt_create = i915_ttm_tt_create,
751 .ttm_tt_populate = i915_ttm_tt_populate,
752 .ttm_tt_unpopulate = i915_ttm_tt_unpopulate,
753 .ttm_tt_destroy = i915_ttm_tt_destroy,
754 .eviction_valuable = i915_ttm_eviction_valuable,
755 .evict_flags = i915_ttm_evict_flags,
756 .move = i915_ttm_move,
757 .swap_notify = i915_ttm_swap_notify,
758 .delete_mem_notify = i915_ttm_delete_mem_notify,
759 .io_mem_reserve = i915_ttm_io_mem_reserve,
760 .io_mem_pfn = i915_ttm_io_mem_pfn,
761 .access_memory = i915_ttm_access_memory,
762};
763
764/**
765 * i915_ttm_driver - Return a pointer to the TTM device funcs
766 *
767 * Return: Pointer to statically allocated TTM device funcs.
768 */
769struct ttm_device_funcs *i915_ttm_driver(void)
770{
771 return &i915_ttm_bo_driver;
772}
773
774static int __i915_ttm_get_pages(struct drm_i915_gem_object *obj,
775 struct ttm_placement *placement)
776{
777 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
778 struct ttm_operation_ctx ctx = {
779 .interruptible = true,
780 .no_wait_gpu = false,
781 };
782 int real_num_busy;
783 int ret;
784
785 /* First try only the requested placement. No eviction. */
786 real_num_busy = placement->num_placement;
787 placement->num_placement = 1;
788 ret = ttm_bo_validate(bo, placement, &ctx);
789 if (ret) {
790 ret = i915_ttm_err_to_gem(ret);
791 /*
792 * Anything that wants to restart the operation gets to
793 * do that.
794 */
795 if (ret == -EDEADLK || ret == -EINTR || ret == -ERESTARTSYS ||
796 ret == -EAGAIN)
797 return ret;
798
799 /*
800 * If the initial attempt fails, allow all accepted placements,
801 * evicting if necessary.
802 */
803 placement->num_placement = real_num_busy;
804 ret = ttm_bo_validate(bo, placement, &ctx);
805 if (ret)
806 return i915_ttm_err_to_gem(ret);
807 }
808
809 if (bo->ttm && !ttm_tt_is_populated(bo->ttm)) {
810 ret = ttm_tt_populate(bo->bdev, bo->ttm, &ctx);
811 if (ret)
812 return ret;
813
814 i915_ttm_adjust_domains_after_move(obj);
815 i915_ttm_adjust_gem_after_move(obj);
816 }
817
818 if (!i915_gem_object_has_pages(obj)) {
819 struct i915_refct_sgt *rsgt =
820 i915_ttm_resource_get_st(obj, bo->resource);
821
822 if (IS_ERR(rsgt))
823 return PTR_ERR(rsgt);
824
825 GEM_BUG_ON(obj->mm.rsgt);
826 obj->mm.rsgt = rsgt;
827 __i915_gem_object_set_pages(obj, &rsgt->table);
828 }
829
830 GEM_BUG_ON(bo->ttm && ((obj->base.size >> PAGE_SHIFT) < bo->ttm->num_pages));
831 i915_ttm_adjust_lru(obj);
832 return ret;
833}
834
835static int i915_ttm_get_pages(struct drm_i915_gem_object *obj)
836{
837 struct ttm_place places[I915_TTM_MAX_PLACEMENTS + 1];
838 struct ttm_placement placement;
839
840 /* restricted by sg_alloc_table */
841 if (overflows_type(obj->base.size >> PAGE_SHIFT, unsigned int))
842 return -E2BIG;
843
844 GEM_BUG_ON(obj->mm.n_placements > I915_TTM_MAX_PLACEMENTS);
845
846 /* Move to the requested placement. */
847 i915_ttm_placement_from_obj(obj, places, &placement);
848
849 return __i915_ttm_get_pages(obj, &placement);
850}
851
852/**
853 * DOC: Migration vs eviction
854 *
855 * GEM migration may not be the same as TTM migration / eviction. If
856 * the TTM core decides to evict an object it may be evicted to a
857 * TTM memory type that is not in the object's allowable GEM regions, or
858 * in fact theoretically to a TTM memory type that doesn't correspond to
859 * a GEM memory region. In that case the object's GEM region is not
860 * updated, and the data is migrated back to the GEM region at
861 * get_pages time. TTM may however set up CPU ptes to the object even
862 * when it is evicted.
863 * Gem forced migration using the i915_ttm_migrate() op, is allowed even
864 * to regions that are not in the object's list of allowable placements.
865 */
866static int __i915_ttm_migrate(struct drm_i915_gem_object *obj,
867 struct intel_memory_region *mr,
868 unsigned int flags)
869{
870 struct ttm_place requested;
871 struct ttm_placement placement;
872 int ret;
873
874 i915_ttm_place_from_region(mr, &requested, obj->bo_offset,
875 obj->base.size, flags);
876 placement.num_placement = 1;
877 placement.placement = &requested;
878
879 ret = __i915_ttm_get_pages(obj, &placement);
880 if (ret)
881 return ret;
882
883 /*
884 * Reinitialize the region bindings. This is primarily
885 * required for objects where the new region is not in
886 * its allowable placements.
887 */
888 if (obj->mm.region != mr) {
889 i915_gem_object_release_memory_region(obj);
890 i915_gem_object_init_memory_region(obj, mr);
891 }
892
893 return 0;
894}
895
896static int i915_ttm_migrate(struct drm_i915_gem_object *obj,
897 struct intel_memory_region *mr,
898 unsigned int flags)
899{
900 return __i915_ttm_migrate(obj, mr, flags);
901}
902
903static void i915_ttm_put_pages(struct drm_i915_gem_object *obj,
904 struct sg_table *st)
905{
906 /*
907 * We're currently not called from a shrinker, so put_pages()
908 * typically means the object is about to destroyed, or called
909 * from move_notify(). So just avoid doing much for now.
910 * If the object is not destroyed next, The TTM eviction logic
911 * and shrinkers will move it out if needed.
912 */
913
914 if (obj->mm.rsgt)
915 i915_refct_sgt_put(fetch_and_zero(&obj->mm.rsgt));
916}
917
918/**
919 * i915_ttm_adjust_lru - Adjust an object's position on relevant LRU lists.
920 * @obj: The object
921 */
922void i915_ttm_adjust_lru(struct drm_i915_gem_object *obj)
923{
924 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
925 struct i915_ttm_tt *i915_tt =
926 container_of(bo->ttm, typeof(*i915_tt), ttm);
927 bool shrinkable =
928 bo->ttm && i915_tt->filp && ttm_tt_is_populated(bo->ttm);
929
930 /*
931 * Don't manipulate the TTM LRUs while in TTM bo destruction.
932 * We're called through i915_ttm_delete_mem_notify().
933 */
934 if (!kref_read(&bo->kref))
935 return;
936
937 /*
938 * We skip managing the shrinker LRU in set_pages() and just manage
939 * everything here. This does at least solve the issue with having
940 * temporary shmem mappings(like with evicted lmem) not being visible to
941 * the shrinker. Only our shmem objects are shrinkable, everything else
942 * we keep as unshrinkable.
943 *
944 * To make sure everything plays nice we keep an extra shrink pin in TTM
945 * if the underlying pages are not currently shrinkable. Once we release
946 * our pin, like when the pages are moved to shmem, the pages will then
947 * be added to the shrinker LRU, assuming the caller isn't also holding
948 * a pin.
949 *
950 * TODO: consider maybe also bumping the shrinker list here when we have
951 * already unpinned it, which should give us something more like an LRU.
952 *
953 * TODO: There is a small window of opportunity for this function to
954 * get called from eviction after we've dropped the last GEM refcount,
955 * but before the TTM deleted flag is set on the object. Avoid
956 * adjusting the shrinker list in such cases, since the object is
957 * not available to the shrinker anyway due to its zero refcount.
958 * To fix this properly we should move to a TTM shrinker LRU list for
959 * these objects.
960 */
961 if (kref_get_unless_zero(&obj->base.refcount)) {
962 if (shrinkable != obj->mm.ttm_shrinkable) {
963 if (shrinkable) {
964 if (obj->mm.madv == I915_MADV_WILLNEED)
965 __i915_gem_object_make_shrinkable(obj);
966 else
967 __i915_gem_object_make_purgeable(obj);
968 } else {
969 i915_gem_object_make_unshrinkable(obj);
970 }
971
972 obj->mm.ttm_shrinkable = shrinkable;
973 }
974 i915_gem_object_put(obj);
975 }
976
977 /*
978 * Put on the correct LRU list depending on the MADV status
979 */
980 spin_lock(&bo->bdev->lru_lock);
981 if (shrinkable) {
982 /* Try to keep shmem_tt from being considered for shrinking. */
983 bo->priority = TTM_MAX_BO_PRIORITY - 1;
984 } else if (obj->mm.madv != I915_MADV_WILLNEED) {
985 bo->priority = I915_TTM_PRIO_PURGE;
986 } else if (!i915_gem_object_has_pages(obj)) {
987 bo->priority = I915_TTM_PRIO_NO_PAGES;
988 } else {
989 struct ttm_resource_manager *man =
990 ttm_manager_type(bo->bdev, bo->resource->mem_type);
991
992 /*
993 * If we need to place an LMEM resource which doesn't need CPU
994 * access then we should try not to victimize mappable objects
995 * first, since we likely end up stealing more of the mappable
996 * portion. And likewise when we try to find space for a mappble
997 * object, we know not to ever victimize objects that don't
998 * occupy any mappable pages.
999 */
1000 if (i915_ttm_cpu_maps_iomem(bo->resource) &&
1001 i915_ttm_buddy_man_visible_size(man) < man->size &&
1002 !(obj->flags & I915_BO_ALLOC_GPU_ONLY))
1003 bo->priority = I915_TTM_PRIO_NEEDS_CPU_ACCESS;
1004 else
1005 bo->priority = I915_TTM_PRIO_HAS_PAGES;
1006 }
1007
1008 ttm_bo_move_to_lru_tail(bo);
1009 spin_unlock(&bo->bdev->lru_lock);
1010}
1011
1012/*
1013 * TTM-backed gem object destruction requires some clarification.
1014 * Basically we have two possibilities here. We can either rely on the
1015 * i915 delayed destruction and put the TTM object when the object
1016 * is idle. This would be detected by TTM which would bypass the
1017 * TTM delayed destroy handling. The other approach is to put the TTM
1018 * object early and rely on the TTM destroyed handling, and then free
1019 * the leftover parts of the GEM object once TTM's destroyed list handling is
1020 * complete. For now, we rely on the latter for two reasons:
1021 * a) TTM can evict an object even when it's on the delayed destroy list,
1022 * which in theory allows for complete eviction.
1023 * b) There is work going on in TTM to allow freeing an object even when
1024 * it's not idle, and using the TTM destroyed list handling could help us
1025 * benefit from that.
1026 */
1027static void i915_ttm_delayed_free(struct drm_i915_gem_object *obj)
1028{
1029 GEM_BUG_ON(!obj->ttm.created);
1030
1031 ttm_bo_put(i915_gem_to_ttm(obj));
1032}
1033
1034static vm_fault_t vm_fault_ttm(struct vm_fault *vmf)
1035{
1036 struct vm_area_struct *area = vmf->vma;
1037 struct ttm_buffer_object *bo = area->vm_private_data;
1038 struct drm_device *dev = bo->base.dev;
1039 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
1040 intel_wakeref_t wakeref = 0;
1041 vm_fault_t ret;
1042 int idx;
1043
1044 /* Sanity check that we allow writing into this object */
1045 if (unlikely(i915_gem_object_is_readonly(obj) &&
1046 area->vm_flags & VM_WRITE))
1047 return VM_FAULT_SIGBUS;
1048
1049 ret = ttm_bo_vm_reserve(bo, vmf);
1050 if (ret)
1051 return ret;
1052
1053 if (obj->mm.madv != I915_MADV_WILLNEED) {
1054 dma_resv_unlock(bo->base.resv);
1055 return VM_FAULT_SIGBUS;
1056 }
1057
1058 /*
1059 * This must be swapped out with shmem ttm_tt (pipeline-gutting).
1060 * Calling ttm_bo_validate() here with TTM_PL_SYSTEM should only go as
1061 * far as far doing a ttm_bo_move_null(), which should skip all the
1062 * other junk.
1063 */
1064 if (!bo->resource) {
1065 struct ttm_operation_ctx ctx = {
1066 .interruptible = true,
1067 .no_wait_gpu = true, /* should be idle already */
1068 };
1069 int err;
1070
1071 GEM_BUG_ON(!bo->ttm || !(bo->ttm->page_flags & TTM_TT_FLAG_SWAPPED));
1072
1073 err = ttm_bo_validate(bo, i915_ttm_sys_placement(), &ctx);
1074 if (err) {
1075 dma_resv_unlock(bo->base.resv);
1076 return VM_FAULT_SIGBUS;
1077 }
1078 } else if (!i915_ttm_resource_mappable(bo->resource)) {
1079 int err = -ENODEV;
1080 int i;
1081
1082 for (i = 0; i < obj->mm.n_placements; i++) {
1083 struct intel_memory_region *mr = obj->mm.placements[i];
1084 unsigned int flags;
1085
1086 if (!resource_size(&mr->io) && mr->type != INTEL_MEMORY_SYSTEM)
1087 continue;
1088
1089 flags = obj->flags;
1090 flags &= ~I915_BO_ALLOC_GPU_ONLY;
1091 err = __i915_ttm_migrate(obj, mr, flags);
1092 if (!err)
1093 break;
1094 }
1095
1096 if (err) {
1097 drm_dbg_ratelimited(dev,
1098 "Unable to make resource CPU accessible(err = %pe)\n",
1099 ERR_PTR(err));
1100 dma_resv_unlock(bo->base.resv);
1101 ret = VM_FAULT_SIGBUS;
1102 goto out_rpm;
1103 }
1104 }
1105
1106 if (i915_ttm_cpu_maps_iomem(bo->resource))
1107 wakeref = intel_runtime_pm_get(&to_i915(obj->base.dev)->runtime_pm);
1108
1109 if (drm_dev_enter(dev, &idx)) {
1110 ret = ttm_bo_vm_fault_reserved(vmf, vmf->vma->vm_page_prot,
1111 TTM_BO_VM_NUM_PREFAULT);
1112 drm_dev_exit(idx);
1113 } else {
1114 ret = ttm_bo_vm_dummy_page(vmf, vmf->vma->vm_page_prot);
1115 }
1116
1117 if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
1118 goto out_rpm;
1119
1120 /*
1121 * ttm_bo_vm_reserve() already has dma_resv_lock.
1122 * userfault_count is protected by dma_resv lock and rpm wakeref.
1123 */
1124 if (ret == VM_FAULT_NOPAGE && wakeref && !obj->userfault_count) {
1125 obj->userfault_count = 1;
1126 spin_lock(&to_i915(obj->base.dev)->runtime_pm.lmem_userfault_lock);
1127 list_add(&obj->userfault_link, &to_i915(obj->base.dev)->runtime_pm.lmem_userfault_list);
1128 spin_unlock(&to_i915(obj->base.dev)->runtime_pm.lmem_userfault_lock);
1129
1130 GEM_WARN_ON(!i915_ttm_cpu_maps_iomem(bo->resource));
1131 }
1132
1133 if (wakeref & CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND)
1134 intel_wakeref_auto(&to_i915(obj->base.dev)->runtime_pm.userfault_wakeref,
1135 msecs_to_jiffies_timeout(CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND));
1136
1137 i915_ttm_adjust_lru(obj);
1138
1139 dma_resv_unlock(bo->base.resv);
1140
1141out_rpm:
1142 if (wakeref)
1143 intel_runtime_pm_put(&to_i915(obj->base.dev)->runtime_pm, wakeref);
1144
1145 return ret;
1146}
1147
1148static int
1149vm_access_ttm(struct vm_area_struct *area, unsigned long addr,
1150 void *buf, int len, int write)
1151{
1152 struct drm_i915_gem_object *obj =
1153 i915_ttm_to_gem(area->vm_private_data);
1154
1155 if (i915_gem_object_is_readonly(obj) && write)
1156 return -EACCES;
1157
1158 return ttm_bo_vm_access(area, addr, buf, len, write);
1159}
1160
1161static void ttm_vm_open(struct vm_area_struct *vma)
1162{
1163 struct drm_i915_gem_object *obj =
1164 i915_ttm_to_gem(vma->vm_private_data);
1165
1166 GEM_BUG_ON(i915_ttm_is_ghost_object(vma->vm_private_data));
1167 i915_gem_object_get(obj);
1168}
1169
1170static void ttm_vm_close(struct vm_area_struct *vma)
1171{
1172 struct drm_i915_gem_object *obj =
1173 i915_ttm_to_gem(vma->vm_private_data);
1174
1175 GEM_BUG_ON(i915_ttm_is_ghost_object(vma->vm_private_data));
1176 i915_gem_object_put(obj);
1177}
1178
1179static const struct vm_operations_struct vm_ops_ttm = {
1180 .fault = vm_fault_ttm,
1181 .access = vm_access_ttm,
1182 .open = ttm_vm_open,
1183 .close = ttm_vm_close,
1184};
1185
1186static u64 i915_ttm_mmap_offset(struct drm_i915_gem_object *obj)
1187{
1188 /* The ttm_bo must be allocated with I915_BO_ALLOC_USER */
1189 GEM_BUG_ON(!drm_mm_node_allocated(&obj->base.vma_node.vm_node));
1190
1191 return drm_vma_node_offset_addr(&obj->base.vma_node);
1192}
1193
1194static void i915_ttm_unmap_virtual(struct drm_i915_gem_object *obj)
1195{
1196 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
1197 intel_wakeref_t wakeref = 0;
1198
1199 assert_object_held_shared(obj);
1200
1201 if (i915_ttm_cpu_maps_iomem(bo->resource)) {
1202 wakeref = intel_runtime_pm_get(&to_i915(obj->base.dev)->runtime_pm);
1203
1204 /* userfault_count is protected by obj lock and rpm wakeref. */
1205 if (obj->userfault_count) {
1206 spin_lock(&to_i915(obj->base.dev)->runtime_pm.lmem_userfault_lock);
1207 list_del(&obj->userfault_link);
1208 spin_unlock(&to_i915(obj->base.dev)->runtime_pm.lmem_userfault_lock);
1209 obj->userfault_count = 0;
1210 }
1211 }
1212
1213 GEM_WARN_ON(obj->userfault_count);
1214
1215 ttm_bo_unmap_virtual(i915_gem_to_ttm(obj));
1216
1217 if (wakeref)
1218 intel_runtime_pm_put(&to_i915(obj->base.dev)->runtime_pm, wakeref);
1219}
1220
1221static const struct drm_i915_gem_object_ops i915_gem_ttm_obj_ops = {
1222 .name = "i915_gem_object_ttm",
1223 .flags = I915_GEM_OBJECT_IS_SHRINKABLE |
1224 I915_GEM_OBJECT_SELF_MANAGED_SHRINK_LIST,
1225
1226 .get_pages = i915_ttm_get_pages,
1227 .put_pages = i915_ttm_put_pages,
1228 .truncate = i915_ttm_truncate,
1229 .shrink = i915_ttm_shrink,
1230
1231 .adjust_lru = i915_ttm_adjust_lru,
1232 .delayed_free = i915_ttm_delayed_free,
1233 .migrate = i915_ttm_migrate,
1234
1235 .mmap_offset = i915_ttm_mmap_offset,
1236 .unmap_virtual = i915_ttm_unmap_virtual,
1237 .mmap_ops = &vm_ops_ttm,
1238};
1239
1240void i915_ttm_bo_destroy(struct ttm_buffer_object *bo)
1241{
1242 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
1243
1244 i915_gem_object_release_memory_region(obj);
1245 mutex_destroy(&obj->ttm.get_io_page.lock);
1246
1247 if (obj->ttm.created) {
1248 /*
1249 * We freely manage the shrinker LRU outide of the mm.pages life
1250 * cycle. As a result when destroying the object we should be
1251 * extra paranoid and ensure we remove it from the LRU, before
1252 * we free the object.
1253 *
1254 * Touching the ttm_shrinkable outside of the object lock here
1255 * should be safe now that the last GEM object ref was dropped.
1256 */
1257 if (obj->mm.ttm_shrinkable)
1258 i915_gem_object_make_unshrinkable(obj);
1259
1260 i915_ttm_backup_free(obj);
1261
1262 /* This releases all gem object bindings to the backend. */
1263 __i915_gem_free_object(obj);
1264
1265 call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
1266 } else {
1267 __i915_gem_object_fini(obj);
1268 }
1269}
1270
1271/*
1272 * __i915_gem_ttm_object_init - Initialize a ttm-backed i915 gem object
1273 * @mem: The initial memory region for the object.
1274 * @obj: The gem object.
1275 * @size: Object size in bytes.
1276 * @flags: gem object flags.
1277 *
1278 * Return: 0 on success, negative error code on failure.
1279 */
1280int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
1281 struct drm_i915_gem_object *obj,
1282 resource_size_t offset,
1283 resource_size_t size,
1284 resource_size_t page_size,
1285 unsigned int flags)
1286{
1287 static struct lock_class_key lock_class;
1288 struct drm_i915_private *i915 = mem->i915;
1289 struct ttm_operation_ctx ctx = {
1290 .interruptible = true,
1291 .no_wait_gpu = false,
1292 };
1293 enum ttm_bo_type bo_type;
1294 int ret;
1295
1296 drm_gem_private_object_init(&i915->drm, &obj->base, size);
1297 i915_gem_object_init(obj, &i915_gem_ttm_obj_ops, &lock_class, flags);
1298
1299 obj->bo_offset = offset;
1300
1301 /* Don't put on a region list until we're either locked or fully initialized. */
1302 obj->mm.region = mem;
1303 INIT_LIST_HEAD(&obj->mm.region_link);
1304
1305 INIT_RADIX_TREE(&obj->ttm.get_io_page.radix, GFP_KERNEL | __GFP_NOWARN);
1306 mutex_init(&obj->ttm.get_io_page.lock);
1307 bo_type = (obj->flags & I915_BO_ALLOC_USER) ? ttm_bo_type_device :
1308 ttm_bo_type_kernel;
1309
1310 obj->base.vma_node.driver_private = i915_gem_to_ttm(obj);
1311
1312 /* Forcing the page size is kernel internal only */
1313 GEM_BUG_ON(page_size && obj->mm.n_placements);
1314
1315 /*
1316 * Keep an extra shrink pin to prevent the object from being made
1317 * shrinkable too early. If the ttm_tt is ever allocated in shmem, we
1318 * drop the pin. The TTM backend manages the shrinker LRU itself,
1319 * outside of the normal mm.pages life cycle.
1320 */
1321 i915_gem_object_make_unshrinkable(obj);
1322
1323 /*
1324 * If this function fails, it will call the destructor, but
1325 * our caller still owns the object. So no freeing in the
1326 * destructor until obj->ttm.created is true.
1327 * Similarly, in delayed_destroy, we can't call ttm_bo_put()
1328 * until successful initialization.
1329 */
1330 ret = ttm_bo_init_reserved(&i915->bdev, i915_gem_to_ttm(obj), bo_type,
1331 &i915_sys_placement, page_size >> PAGE_SHIFT,
1332 &ctx, NULL, NULL, i915_ttm_bo_destroy);
1333
1334 /*
1335 * XXX: The ttm_bo_init_reserved() functions returns -ENOSPC if the size
1336 * is too big to add vma. The direct function that returns -ENOSPC is
1337 * drm_mm_insert_node_in_range(). To handle the same error as other code
1338 * that returns -E2BIG when the size is too large, it converts -ENOSPC to
1339 * -E2BIG.
1340 */
1341 if (size >> PAGE_SHIFT > INT_MAX && ret == -ENOSPC)
1342 ret = -E2BIG;
1343
1344 if (ret)
1345 return i915_ttm_err_to_gem(ret);
1346
1347 obj->ttm.created = true;
1348 i915_gem_object_release_memory_region(obj);
1349 i915_gem_object_init_memory_region(obj, mem);
1350 i915_ttm_adjust_domains_after_move(obj);
1351 i915_ttm_adjust_gem_after_move(obj);
1352 i915_gem_object_unlock(obj);
1353
1354 return 0;
1355}
1356
1357static const struct intel_memory_region_ops ttm_system_region_ops = {
1358 .init_object = __i915_gem_ttm_object_init,
1359 .release = intel_region_ttm_fini,
1360};
1361
1362struct intel_memory_region *
1363i915_gem_ttm_system_setup(struct drm_i915_private *i915,
1364 u16 type, u16 instance)
1365{
1366 struct intel_memory_region *mr;
1367
1368 mr = intel_memory_region_create(i915, 0,
1369 totalram_pages() << PAGE_SHIFT,
1370 PAGE_SIZE, 0, 0,
1371 type, instance,
1372 &ttm_system_region_ops);
1373 if (IS_ERR(mr))
1374 return mr;
1375
1376 intel_memory_region_set_name(mr, "system-ttm");
1377 return mr;
1378}