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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2021 Intel Corporation4 */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 026#define I915_TTM_PRIO_NO_PAGES 127#define I915_TTM_PRIO_HAS_PAGES 228#define I915_TTM_PRIO_NEEDS_CPU_ACCESS 329 30/*31 * Size of struct ttm_place vector in on-stack struct ttm_placement allocs32 */33#define I915_TTM_MAX_PLACEMENTS INTEL_REGION_UNKNOWN34 35/**36 * struct i915_ttm_tt - TTM page vector with additional private information37 * @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 the45 * scatter-gather table mapped and cached up to that point. This is46 * different from the cached gem object io scatter-gather table which47 * 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 be72 * used for an object in system memory.73 *74 * Rather than making the struct extern, use this75 * 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 to94 * restart the operation, since we don't record the contending95 * 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_caching112i915_ttm_select_tt_caching(const struct drm_i915_gem_object *obj)113{114 /*115 * Objects only allowed in system get cached cpu-mappings, or when116 * evicting lmem-only buffers to system for swapping. Other objects get117 * 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 void126i915_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 void157i915_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);168 169 /* Cache this on object? */170 for (i = 0; i < num_allowed; ++i) {171 i915_ttm_place_from_region(obj->mm.placements[i],172 &places[i + 1], obj->bo_offset,173 obj->base.size, flags);174 places[i + 1].flags |= TTM_PL_FLAG_FALLBACK;175 }176 177 placement->num_placement = num_allowed + 1;178 placement->placement = places;179}180 181static int i915_ttm_tt_shmem_populate(struct ttm_device *bdev,182 struct ttm_tt *ttm,183 struct ttm_operation_ctx *ctx)184{185 struct drm_i915_private *i915 = container_of(bdev, typeof(*i915), bdev);186 struct intel_memory_region *mr = i915->mm.regions[INTEL_MEMORY_SYSTEM];187 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);188 const unsigned int max_segment = i915_sg_segment_size(i915->drm.dev);189 const size_t size = (size_t)ttm->num_pages << PAGE_SHIFT;190 struct file *filp = i915_tt->filp;191 struct sgt_iter sgt_iter;192 struct sg_table *st;193 struct page *page;194 unsigned long i;195 int err;196 197 if (!filp) {198 struct address_space *mapping;199 gfp_t mask;200 201 filp = shmem_file_setup("i915-shmem-tt", size, VM_NORESERVE);202 if (IS_ERR(filp))203 return PTR_ERR(filp);204 205 mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;206 207 mapping = filp->f_mapping;208 mapping_set_gfp_mask(mapping, mask);209 GEM_BUG_ON(!(mapping_gfp_mask(mapping) & __GFP_RECLAIM));210 211 i915_tt->filp = filp;212 }213 214 st = &i915_tt->cached_rsgt.table;215 err = shmem_sg_alloc_table(i915, st, size, mr, filp->f_mapping,216 max_segment);217 if (err)218 return err;219 220 err = dma_map_sgtable(i915_tt->dev, st, DMA_BIDIRECTIONAL,221 DMA_ATTR_SKIP_CPU_SYNC);222 if (err)223 goto err_free_st;224 225 i = 0;226 for_each_sgt_page(page, sgt_iter, st)227 ttm->pages[i++] = page;228 229 if (ttm->page_flags & TTM_TT_FLAG_SWAPPED)230 ttm->page_flags &= ~TTM_TT_FLAG_SWAPPED;231 232 return 0;233 234err_free_st:235 shmem_sg_free_table(st, filp->f_mapping, false, false);236 237 return err;238}239 240static void i915_ttm_tt_shmem_unpopulate(struct ttm_tt *ttm)241{242 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);243 bool backup = ttm->page_flags & TTM_TT_FLAG_SWAPPED;244 struct sg_table *st = &i915_tt->cached_rsgt.table;245 246 shmem_sg_free_table(st, file_inode(i915_tt->filp)->i_mapping,247 backup, backup);248}249 250static void i915_ttm_tt_release(struct kref *ref)251{252 struct i915_ttm_tt *i915_tt =253 container_of(ref, typeof(*i915_tt), cached_rsgt.kref);254 struct sg_table *st = &i915_tt->cached_rsgt.table;255 256 GEM_WARN_ON(st->sgl);257 258 kfree(i915_tt);259}260 261static const struct i915_refct_sgt_ops tt_rsgt_ops = {262 .release = i915_ttm_tt_release263};264 265static struct ttm_tt *i915_ttm_tt_create(struct ttm_buffer_object *bo,266 uint32_t page_flags)267{268 struct drm_i915_private *i915 = container_of(bo->bdev, typeof(*i915),269 bdev);270 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);271 unsigned long ccs_pages = 0;272 enum ttm_caching caching;273 struct i915_ttm_tt *i915_tt;274 int ret;275 276 if (i915_ttm_is_ghost_object(bo))277 return NULL;278 279 i915_tt = kzalloc(sizeof(*i915_tt), GFP_KERNEL);280 if (!i915_tt)281 return NULL;282 283 if (obj->flags & I915_BO_ALLOC_CPU_CLEAR && (!bo->resource ||284 ttm_manager_type(bo->bdev, bo->resource->mem_type)->use_tt))285 page_flags |= TTM_TT_FLAG_ZERO_ALLOC;286 287 caching = i915_ttm_select_tt_caching(obj);288 if (i915_gem_object_is_shrinkable(obj) && caching == ttm_cached) {289 page_flags |= TTM_TT_FLAG_EXTERNAL |290 TTM_TT_FLAG_EXTERNAL_MAPPABLE;291 i915_tt->is_shmem = true;292 }293 294 if (i915_gem_object_needs_ccs_pages(obj))295 ccs_pages = DIV_ROUND_UP(DIV_ROUND_UP(bo->base.size,296 NUM_BYTES_PER_CCS_BYTE),297 PAGE_SIZE);298 299 ret = ttm_tt_init(&i915_tt->ttm, bo, page_flags, caching, ccs_pages);300 if (ret)301 goto err_free;302 303 __i915_refct_sgt_init(&i915_tt->cached_rsgt, bo->base.size,304 &tt_rsgt_ops);305 306 i915_tt->dev = obj->base.dev->dev;307 308 return &i915_tt->ttm;309 310err_free:311 kfree(i915_tt);312 return NULL;313}314 315static int i915_ttm_tt_populate(struct ttm_device *bdev,316 struct ttm_tt *ttm,317 struct ttm_operation_ctx *ctx)318{319 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);320 321 if (i915_tt->is_shmem)322 return i915_ttm_tt_shmem_populate(bdev, ttm, ctx);323 324 return ttm_pool_alloc(&bdev->pool, ttm, ctx);325}326 327static void i915_ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)328{329 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);330 struct sg_table *st = &i915_tt->cached_rsgt.table;331 332 if (st->sgl)333 dma_unmap_sgtable(i915_tt->dev, st, DMA_BIDIRECTIONAL, 0);334 335 if (i915_tt->is_shmem) {336 i915_ttm_tt_shmem_unpopulate(ttm);337 } else {338 sg_free_table(st);339 ttm_pool_free(&bdev->pool, ttm);340 }341}342 343static void i915_ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)344{345 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);346 347 if (i915_tt->filp)348 fput(i915_tt->filp);349 350 ttm_tt_fini(ttm);351 i915_refct_sgt_put(&i915_tt->cached_rsgt);352}353 354static bool i915_ttm_eviction_valuable(struct ttm_buffer_object *bo,355 const struct ttm_place *place)356{357 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);358 359 if (i915_ttm_is_ghost_object(bo))360 return false;361 362 /*363 * EXTERNAL objects should never be swapped out by TTM, instead we need364 * to handle that ourselves. TTM will already skip such objects for us,365 * but we would like to avoid grabbing locks for no good reason.366 */367 if (bo->ttm && bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL)368 return false;369 370 /* Will do for now. Our pinned objects are still on TTM's LRU lists */371 if (!i915_gem_object_evictable(obj))372 return false;373 374 return ttm_bo_eviction_valuable(bo, place);375}376 377static void i915_ttm_evict_flags(struct ttm_buffer_object *bo,378 struct ttm_placement *placement)379{380 *placement = i915_sys_placement;381}382 383/**384 * i915_ttm_free_cached_io_rsgt - Free object cached LMEM information385 * @obj: The GEM object386 * This function frees any LMEM-related information that is cached on387 * the object. For example the radix tree for fast page lookup and the388 * cached refcounted sg-table389 */390void i915_ttm_free_cached_io_rsgt(struct drm_i915_gem_object *obj)391{392 struct radix_tree_iter iter;393 void __rcu **slot;394 395 if (!obj->ttm.cached_io_rsgt)396 return;397 398 rcu_read_lock();399 radix_tree_for_each_slot(slot, &obj->ttm.get_io_page.radix, &iter, 0)400 radix_tree_delete(&obj->ttm.get_io_page.radix, iter.index);401 rcu_read_unlock();402 403 i915_refct_sgt_put(obj->ttm.cached_io_rsgt);404 obj->ttm.cached_io_rsgt = NULL;405}406 407/**408 * i915_ttm_purge - Clear an object of its memory409 * @obj: The object410 *411 * This function is called to clear an object of it's memory when it is412 * marked as not needed anymore.413 *414 * Return: 0 on success, negative error code on failure.415 */416int i915_ttm_purge(struct drm_i915_gem_object *obj)417{418 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);419 struct i915_ttm_tt *i915_tt =420 container_of(bo->ttm, typeof(*i915_tt), ttm);421 struct ttm_operation_ctx ctx = {422 .interruptible = true,423 .no_wait_gpu = false,424 };425 struct ttm_placement place = {};426 int ret;427 428 if (obj->mm.madv == __I915_MADV_PURGED)429 return 0;430 431 ret = ttm_bo_validate(bo, &place, &ctx);432 if (ret)433 return ret;434 435 if (bo->ttm && i915_tt->filp) {436 /*437 * The below fput(which eventually calls shmem_truncate) might438 * be delayed by worker, so when directly called to purge the439 * pages(like by the shrinker) we should try to be more440 * aggressive and release the pages immediately.441 */442 shmem_truncate_range(file_inode(i915_tt->filp),443 0, (loff_t)-1);444 fput(fetch_and_zero(&i915_tt->filp));445 }446 447 obj->write_domain = 0;448 obj->read_domains = 0;449 i915_ttm_adjust_gem_after_move(obj);450 i915_ttm_free_cached_io_rsgt(obj);451 obj->mm.madv = __I915_MADV_PURGED;452 453 return 0;454}455 456static int i915_ttm_shrink(struct drm_i915_gem_object *obj, unsigned int flags)457{458 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);459 struct i915_ttm_tt *i915_tt =460 container_of(bo->ttm, typeof(*i915_tt), ttm);461 struct ttm_operation_ctx ctx = {462 .interruptible = true,463 .no_wait_gpu = flags & I915_GEM_OBJECT_SHRINK_NO_GPU_WAIT,464 };465 struct ttm_placement place = {};466 int ret;467 468 if (!bo->ttm || i915_ttm_cpu_maps_iomem(bo->resource))469 return 0;470 471 GEM_BUG_ON(!i915_tt->is_shmem);472 473 if (!i915_tt->filp)474 return 0;475 476 ret = ttm_bo_wait_ctx(bo, &ctx);477 if (ret)478 return ret;479 480 switch (obj->mm.madv) {481 case I915_MADV_DONTNEED:482 return i915_ttm_purge(obj);483 case __I915_MADV_PURGED:484 return 0;485 }486 487 if (bo->ttm->page_flags & TTM_TT_FLAG_SWAPPED)488 return 0;489 490 bo->ttm->page_flags |= TTM_TT_FLAG_SWAPPED;491 ret = ttm_bo_validate(bo, &place, &ctx);492 if (ret) {493 bo->ttm->page_flags &= ~TTM_TT_FLAG_SWAPPED;494 return ret;495 }496 497 if (flags & I915_GEM_OBJECT_SHRINK_WRITEBACK)498 __shmem_writeback(obj->base.size, i915_tt->filp->f_mapping);499 500 return 0;501}502 503static void i915_ttm_delete_mem_notify(struct ttm_buffer_object *bo)504{505 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);506 507 /*508 * This gets called twice by ttm, so long as we have a ttm resource or509 * ttm_tt then we can still safely call this. Due to pipeline-gutting,510 * we maybe have NULL bo->resource, but in that case we should always511 * have a ttm alive (like if the pages are swapped out).512 */513 if ((bo->resource || bo->ttm) && !i915_ttm_is_ghost_object(bo)) {514 __i915_gem_object_pages_fini(obj);515 i915_ttm_free_cached_io_rsgt(obj);516 }517}518 519static struct i915_refct_sgt *i915_ttm_tt_get_st(struct ttm_tt *ttm)520{521 struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);522 struct sg_table *st;523 int ret;524 525 if (i915_tt->cached_rsgt.table.sgl)526 return i915_refct_sgt_get(&i915_tt->cached_rsgt);527 528 st = &i915_tt->cached_rsgt.table;529 ret = sg_alloc_table_from_pages_segment(st,530 ttm->pages, ttm->num_pages,531 0, (unsigned long)ttm->num_pages << PAGE_SHIFT,532 i915_sg_segment_size(i915_tt->dev), GFP_KERNEL);533 if (ret) {534 st->sgl = NULL;535 return ERR_PTR(ret);536 }537 538 ret = dma_map_sgtable(i915_tt->dev, st, DMA_BIDIRECTIONAL, 0);539 if (ret) {540 sg_free_table(st);541 return ERR_PTR(ret);542 }543 544 return i915_refct_sgt_get(&i915_tt->cached_rsgt);545}546 547/**548 * i915_ttm_resource_get_st - Get a refcounted sg-table pointing to the549 * resource memory550 * @obj: The GEM object used for sg-table caching551 * @res: The struct ttm_resource for which an sg-table is requested.552 *553 * This function returns a refcounted sg-table representing the memory554 * pointed to by @res. If @res is the object's current resource it may also555 * cache the sg_table on the object or attempt to access an already cached556 * sg-table. The refcounted sg-table needs to be put when no-longer in use.557 *558 * Return: A valid pointer to a struct i915_refct_sgt or error pointer on559 * failure.560 */561struct i915_refct_sgt *562i915_ttm_resource_get_st(struct drm_i915_gem_object *obj,563 struct ttm_resource *res)564{565 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);566 u32 page_alignment;567 568 if (!i915_ttm_gtt_binds_lmem(res))569 return i915_ttm_tt_get_st(bo->ttm);570 571 page_alignment = bo->page_alignment << PAGE_SHIFT;572 if (!page_alignment)573 page_alignment = obj->mm.region->min_page_size;574 575 /*576 * If CPU mapping differs, we need to add the ttm_tt pages to577 * the resulting st. Might make sense for GGTT.578 */579 GEM_WARN_ON(!i915_ttm_cpu_maps_iomem(res));580 if (bo->resource == res) {581 if (!obj->ttm.cached_io_rsgt) {582 struct i915_refct_sgt *rsgt;583 584 rsgt = intel_region_ttm_resource_to_rsgt(obj->mm.region,585 res,586 page_alignment);587 if (IS_ERR(rsgt))588 return rsgt;589 590 obj->ttm.cached_io_rsgt = rsgt;591 }592 return i915_refct_sgt_get(obj->ttm.cached_io_rsgt);593 }594 595 return intel_region_ttm_resource_to_rsgt(obj->mm.region, res,596 page_alignment);597}598 599static int i915_ttm_truncate(struct drm_i915_gem_object *obj)600{601 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);602 long err;603 604 WARN_ON_ONCE(obj->mm.madv == I915_MADV_WILLNEED);605 606 err = dma_resv_wait_timeout(bo->base.resv, DMA_RESV_USAGE_BOOKKEEP,607 true, 15 * HZ);608 if (err < 0)609 return err;610 if (err == 0)611 return -EBUSY;612 613 err = i915_ttm_move_notify(bo);614 if (err)615 return err;616 617 return i915_ttm_purge(obj);618}619 620static void i915_ttm_swap_notify(struct ttm_buffer_object *bo)621{622 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);623 int ret;624 625 if (i915_ttm_is_ghost_object(bo))626 return;627 628 ret = i915_ttm_move_notify(bo);629 GEM_WARN_ON(ret);630 GEM_WARN_ON(obj->ttm.cached_io_rsgt);631 if (!ret && obj->mm.madv != I915_MADV_WILLNEED)632 i915_ttm_purge(obj);633}634 635/**636 * i915_ttm_resource_mappable - Return true if the ttm resource is CPU637 * accessible.638 * @res: The TTM resource to check.639 *640 * This is interesting on small-BAR systems where we may encounter lmem objects641 * that can't be accessed via the CPU.642 */643bool i915_ttm_resource_mappable(struct ttm_resource *res)644{645 struct i915_ttm_buddy_resource *bman_res = to_ttm_buddy_resource(res);646 647 if (!i915_ttm_cpu_maps_iomem(res))648 return true;649 650 return bman_res->used_visible_size == PFN_UP(bman_res->base.size);651}652 653static int i915_ttm_io_mem_reserve(struct ttm_device *bdev, struct ttm_resource *mem)654{655 struct drm_i915_gem_object *obj = i915_ttm_to_gem(mem->bo);656 bool unknown_state;657 658 if (i915_ttm_is_ghost_object(mem->bo))659 return -EINVAL;660 661 if (!kref_get_unless_zero(&obj->base.refcount))662 return -EINVAL;663 664 assert_object_held(obj);665 666 unknown_state = i915_gem_object_has_unknown_state(obj);667 i915_gem_object_put(obj);668 if (unknown_state)669 return -EINVAL;670 671 if (!i915_ttm_cpu_maps_iomem(mem))672 return 0;673 674 if (!i915_ttm_resource_mappable(mem))675 return -EINVAL;676 677 mem->bus.caching = ttm_write_combined;678 mem->bus.is_iomem = true;679 680 return 0;681}682 683static unsigned long i915_ttm_io_mem_pfn(struct ttm_buffer_object *bo,684 unsigned long page_offset)685{686 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);687 struct scatterlist *sg;688 unsigned long base;689 unsigned int ofs;690 691 GEM_BUG_ON(i915_ttm_is_ghost_object(bo));692 GEM_WARN_ON(bo->ttm);693 694 base = obj->mm.region->iomap.base - obj->mm.region->region.start;695 sg = i915_gem_object_page_iter_get_sg(obj, &obj->ttm.get_io_page, page_offset, &ofs);696 697 return ((base + sg_dma_address(sg)) >> PAGE_SHIFT) + ofs;698}699 700static int i915_ttm_access_memory(struct ttm_buffer_object *bo,701 unsigned long offset, void *buf,702 int len, int write)703{704 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);705 resource_size_t iomap = obj->mm.region->iomap.base -706 obj->mm.region->region.start;707 unsigned long page = offset >> PAGE_SHIFT;708 unsigned long bytes_left = len;709 710 /*711 * TODO: For now just let it fail if the resource is non-mappable,712 * otherwise we need to perform the memcpy from the gpu here, without713 * interfering with the object (like moving the entire thing).714 */715 if (!i915_ttm_resource_mappable(bo->resource))716 return -EIO;717 718 offset -= page << PAGE_SHIFT;719 do {720 unsigned long bytes = min(bytes_left, PAGE_SIZE - offset);721 void __iomem *ptr;722 dma_addr_t daddr;723 724 daddr = i915_gem_object_get_dma_address(obj, page);725 ptr = ioremap_wc(iomap + daddr + offset, bytes);726 if (!ptr)727 return -EIO;728 729 if (write)730 memcpy_toio(ptr, buf, bytes);731 else732 memcpy_fromio(buf, ptr, bytes);733 iounmap(ptr);734 735 page++;736 buf += bytes;737 bytes_left -= bytes;738 offset = 0;739 } while (bytes_left);740 741 return len;742}743 744/*745 * All callbacks need to take care not to downcast a struct ttm_buffer_object746 * without checking its subclass, since it might be a TTM ghost object.747 */748static struct ttm_device_funcs i915_ttm_bo_driver = {749 .ttm_tt_create = i915_ttm_tt_create,750 .ttm_tt_populate = i915_ttm_tt_populate,751 .ttm_tt_unpopulate = i915_ttm_tt_unpopulate,752 .ttm_tt_destroy = i915_ttm_tt_destroy,753 .eviction_valuable = i915_ttm_eviction_valuable,754 .evict_flags = i915_ttm_evict_flags,755 .move = i915_ttm_move,756 .swap_notify = i915_ttm_swap_notify,757 .delete_mem_notify = i915_ttm_delete_mem_notify,758 .io_mem_reserve = i915_ttm_io_mem_reserve,759 .io_mem_pfn = i915_ttm_io_mem_pfn,760 .access_memory = i915_ttm_access_memory,761};762 763/**764 * i915_ttm_driver - Return a pointer to the TTM device funcs765 *766 * Return: Pointer to statically allocated TTM device funcs.767 */768struct ttm_device_funcs *i915_ttm_driver(void)769{770 return &i915_ttm_bo_driver;771}772 773static int __i915_ttm_get_pages(struct drm_i915_gem_object *obj,774 struct ttm_placement *placement)775{776 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);777 struct ttm_operation_ctx ctx = {778 .interruptible = true,779 .no_wait_gpu = false,780 };781 struct ttm_placement initial_placement;782 struct ttm_place initial_place;783 int ret;784 785 /* First try only the requested placement. No eviction. */786 initial_placement.num_placement = 1;787 memcpy(&initial_place, placement->placement, sizeof(struct ttm_place));788 initial_place.flags |= TTM_PL_FLAG_DESIRED;789 initial_placement.placement = &initial_place;790 ret = ttm_bo_validate(bo, &initial_placement, &ctx);791 if (ret) {792 ret = i915_ttm_err_to_gem(ret);793 /*794 * Anything that wants to restart the operation gets to795 * do that.796 */797 if (ret == -EDEADLK || ret == -EINTR || ret == -ERESTARTSYS ||798 ret == -EAGAIN)799 return ret;800 801 /*802 * If the initial attempt fails, allow all accepted placements,803 * evicting if necessary.804 */805 ret = ttm_bo_validate(bo, placement, &ctx);806 if (ret)807 return i915_ttm_err_to_gem(ret);808 }809 810 if (bo->ttm && !ttm_tt_is_populated(bo->ttm)) {811 ret = ttm_tt_populate(bo->bdev, bo->ttm, &ctx);812 if (ret)813 return ret;814 815 i915_ttm_adjust_domains_after_move(obj);816 i915_ttm_adjust_gem_after_move(obj);817 }818 819 if (!i915_gem_object_has_pages(obj)) {820 struct i915_refct_sgt *rsgt =821 i915_ttm_resource_get_st(obj, bo->resource);822 823 if (IS_ERR(rsgt))824 return PTR_ERR(rsgt);825 826 GEM_BUG_ON(obj->mm.rsgt);827 obj->mm.rsgt = rsgt;828 __i915_gem_object_set_pages(obj, &rsgt->table);829 }830 831 GEM_BUG_ON(bo->ttm && ((obj->base.size >> PAGE_SHIFT) < bo->ttm->num_pages));832 i915_ttm_adjust_lru(obj);833 return ret;834}835 836static int i915_ttm_get_pages(struct drm_i915_gem_object *obj)837{838 struct ttm_place places[I915_TTM_MAX_PLACEMENTS + 1];839 struct ttm_placement placement;840 841 /* restricted by sg_alloc_table */842 if (overflows_type(obj->base.size >> PAGE_SHIFT, unsigned int))843 return -E2BIG;844 845 GEM_BUG_ON(obj->mm.n_placements > I915_TTM_MAX_PLACEMENTS);846 847 /* Move to the requested placement. */848 i915_ttm_placement_from_obj(obj, places, &placement);849 850 return __i915_ttm_get_pages(obj, &placement);851}852 853/**854 * DOC: Migration vs eviction855 *856 * GEM migration may not be the same as TTM migration / eviction. If857 * the TTM core decides to evict an object it may be evicted to a858 * TTM memory type that is not in the object's allowable GEM regions, or859 * in fact theoretically to a TTM memory type that doesn't correspond to860 * a GEM memory region. In that case the object's GEM region is not861 * updated, and the data is migrated back to the GEM region at862 * get_pages time. TTM may however set up CPU ptes to the object even863 * when it is evicted.864 * Gem forced migration using the i915_ttm_migrate() op, is allowed even865 * to regions that are not in the object's list of allowable placements.866 */867static int __i915_ttm_migrate(struct drm_i915_gem_object *obj,868 struct intel_memory_region *mr,869 unsigned int flags)870{871 struct ttm_place requested;872 struct ttm_placement placement;873 int ret;874 875 i915_ttm_place_from_region(mr, &requested, obj->bo_offset,876 obj->base.size, flags);877 placement.num_placement = 1;878 placement.placement = &requested;879 880 ret = __i915_ttm_get_pages(obj, &placement);881 if (ret)882 return ret;883 884 /*885 * Reinitialize the region bindings. This is primarily886 * required for objects where the new region is not in887 * its allowable placements.888 */889 if (obj->mm.region != mr) {890 i915_gem_object_release_memory_region(obj);891 i915_gem_object_init_memory_region(obj, mr);892 }893 894 return 0;895}896 897static int i915_ttm_migrate(struct drm_i915_gem_object *obj,898 struct intel_memory_region *mr,899 unsigned int flags)900{901 return __i915_ttm_migrate(obj, mr, flags);902}903 904static void i915_ttm_put_pages(struct drm_i915_gem_object *obj,905 struct sg_table *st)906{907 /*908 * We're currently not called from a shrinker, so put_pages()909 * typically means the object is about to destroyed, or called910 * from move_notify(). So just avoid doing much for now.911 * If the object is not destroyed next, The TTM eviction logic912 * and shrinkers will move it out if needed.913 */914 915 if (obj->mm.rsgt)916 i915_refct_sgt_put(fetch_and_zero(&obj->mm.rsgt));917}918 919/**920 * i915_ttm_adjust_lru - Adjust an object's position on relevant LRU lists.921 * @obj: The object922 */923void i915_ttm_adjust_lru(struct drm_i915_gem_object *obj)924{925 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);926 struct i915_ttm_tt *i915_tt =927 container_of(bo->ttm, typeof(*i915_tt), ttm);928 bool shrinkable =929 bo->ttm && i915_tt->filp && ttm_tt_is_populated(bo->ttm);930 931 /*932 * Don't manipulate the TTM LRUs while in TTM bo destruction.933 * We're called through i915_ttm_delete_mem_notify().934 */935 if (!kref_read(&bo->kref))936 return;937 938 /*939 * We skip managing the shrinker LRU in set_pages() and just manage940 * everything here. This does at least solve the issue with having941 * temporary shmem mappings(like with evicted lmem) not being visible to942 * the shrinker. Only our shmem objects are shrinkable, everything else943 * we keep as unshrinkable.944 *945 * To make sure everything plays nice we keep an extra shrink pin in TTM946 * if the underlying pages are not currently shrinkable. Once we release947 * our pin, like when the pages are moved to shmem, the pages will then948 * be added to the shrinker LRU, assuming the caller isn't also holding949 * a pin.950 *951 * TODO: consider maybe also bumping the shrinker list here when we have952 * already unpinned it, which should give us something more like an LRU.953 *954 * TODO: There is a small window of opportunity for this function to955 * get called from eviction after we've dropped the last GEM refcount,956 * but before the TTM deleted flag is set on the object. Avoid957 * adjusting the shrinker list in such cases, since the object is958 * not available to the shrinker anyway due to its zero refcount.959 * To fix this properly we should move to a TTM shrinker LRU list for960 * these objects.961 */962 if (kref_get_unless_zero(&obj->base.refcount)) {963 if (shrinkable != obj->mm.ttm_shrinkable) {964 if (shrinkable) {965 if (obj->mm.madv == I915_MADV_WILLNEED)966 __i915_gem_object_make_shrinkable(obj);967 else968 __i915_gem_object_make_purgeable(obj);969 } else {970 i915_gem_object_make_unshrinkable(obj);971 }972 973 obj->mm.ttm_shrinkable = shrinkable;974 }975 i915_gem_object_put(obj);976 }977 978 /*979 * Put on the correct LRU list depending on the MADV status980 */981 spin_lock(&bo->bdev->lru_lock);982 if (shrinkable) {983 /* Try to keep shmem_tt from being considered for shrinking. */984 bo->priority = TTM_MAX_BO_PRIORITY - 1;985 } else if (obj->mm.madv != I915_MADV_WILLNEED) {986 bo->priority = I915_TTM_PRIO_PURGE;987 } else if (!i915_gem_object_has_pages(obj)) {988 bo->priority = I915_TTM_PRIO_NO_PAGES;989 } else {990 struct ttm_resource_manager *man =991 ttm_manager_type(bo->bdev, bo->resource->mem_type);992 993 /*994 * If we need to place an LMEM resource which doesn't need CPU995 * access then we should try not to victimize mappable objects996 * first, since we likely end up stealing more of the mappable997 * portion. And likewise when we try to find space for a mappble998 * object, we know not to ever victimize objects that don't999 * occupy any mappable pages.1000 */1001 if (i915_ttm_cpu_maps_iomem(bo->resource) &&1002 i915_ttm_buddy_man_visible_size(man) < man->size &&1003 !(obj->flags & I915_BO_ALLOC_GPU_ONLY))1004 bo->priority = I915_TTM_PRIO_NEEDS_CPU_ACCESS;1005 else1006 bo->priority = I915_TTM_PRIO_HAS_PAGES;1007 }1008 1009 ttm_bo_move_to_lru_tail(bo);1010 spin_unlock(&bo->bdev->lru_lock);1011}1012 1013/*1014 * TTM-backed gem object destruction requires some clarification.1015 * Basically we have two possibilities here. We can either rely on the1016 * i915 delayed destruction and put the TTM object when the object1017 * is idle. This would be detected by TTM which would bypass the1018 * TTM delayed destroy handling. The other approach is to put the TTM1019 * object early and rely on the TTM destroyed handling, and then free1020 * the leftover parts of the GEM object once TTM's destroyed list handling is1021 * complete. For now, we rely on the latter for two reasons:1022 * a) TTM can evict an object even when it's on the delayed destroy list,1023 * which in theory allows for complete eviction.1024 * b) There is work going on in TTM to allow freeing an object even when1025 * it's not idle, and using the TTM destroyed list handling could help us1026 * benefit from that.1027 */1028static void i915_ttm_delayed_free(struct drm_i915_gem_object *obj)1029{1030 GEM_BUG_ON(!obj->ttm.created);1031 1032 ttm_bo_put(i915_gem_to_ttm(obj));1033}1034 1035static vm_fault_t vm_fault_ttm(struct vm_fault *vmf)1036{1037 struct vm_area_struct *area = vmf->vma;1038 struct ttm_buffer_object *bo = area->vm_private_data;1039 struct drm_device *dev = bo->base.dev;1040 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);1041 intel_wakeref_t wakeref = 0;1042 vm_fault_t ret;1043 int idx;1044 1045 /* Sanity check that we allow writing into this object */1046 if (unlikely(i915_gem_object_is_readonly(obj) &&1047 area->vm_flags & VM_WRITE))1048 return VM_FAULT_SIGBUS;1049 1050 ret = ttm_bo_vm_reserve(bo, vmf);1051 if (ret)1052 return ret;1053 1054 if (obj->mm.madv != I915_MADV_WILLNEED) {1055 dma_resv_unlock(bo->base.resv);1056 return VM_FAULT_SIGBUS;1057 }1058 1059 /*1060 * This must be swapped out with shmem ttm_tt (pipeline-gutting).1061 * Calling ttm_bo_validate() here with TTM_PL_SYSTEM should only go as1062 * far as far doing a ttm_bo_move_null(), which should skip all the1063 * other junk.1064 */1065 if (!bo->resource) {1066 struct ttm_operation_ctx ctx = {1067 .interruptible = true,1068 .no_wait_gpu = true, /* should be idle already */1069 };1070 int err;1071 1072 GEM_BUG_ON(!bo->ttm || !(bo->ttm->page_flags & TTM_TT_FLAG_SWAPPED));1073 1074 err = ttm_bo_validate(bo, i915_ttm_sys_placement(), &ctx);1075 if (err) {1076 dma_resv_unlock(bo->base.resv);1077 return VM_FAULT_SIGBUS;1078 }1079 } else if (!i915_ttm_resource_mappable(bo->resource)) {1080 int err = -ENODEV;1081 int i;1082 1083 for (i = 0; i < obj->mm.n_placements; i++) {1084 struct intel_memory_region *mr = obj->mm.placements[i];1085 unsigned int flags;1086 1087 if (!resource_size(&mr->io) && mr->type != INTEL_MEMORY_SYSTEM)1088 continue;1089 1090 flags = obj->flags;1091 flags &= ~I915_BO_ALLOC_GPU_ONLY;1092 err = __i915_ttm_migrate(obj, mr, flags);1093 if (!err)1094 break;1095 }1096 1097 if (err) {1098 drm_dbg_ratelimited(dev,1099 "Unable to make resource CPU accessible(err = %pe)\n",1100 ERR_PTR(err));1101 dma_resv_unlock(bo->base.resv);1102 ret = VM_FAULT_SIGBUS;1103 goto out_rpm;1104 }1105 }1106 1107 if (i915_ttm_cpu_maps_iomem(bo->resource))1108 wakeref = intel_runtime_pm_get(&to_i915(obj->base.dev)->runtime_pm);1109 1110 if (drm_dev_enter(dev, &idx)) {1111 ret = ttm_bo_vm_fault_reserved(vmf, vmf->vma->vm_page_prot,1112 TTM_BO_VM_NUM_PREFAULT);1113 drm_dev_exit(idx);1114 } else {1115 ret = ttm_bo_vm_dummy_page(vmf, vmf->vma->vm_page_prot);1116 }1117 1118 if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))1119 goto out_rpm;1120 1121 /*1122 * ttm_bo_vm_reserve() already has dma_resv_lock.1123 * userfault_count is protected by dma_resv lock and rpm wakeref.1124 */1125 if (ret == VM_FAULT_NOPAGE && wakeref && !obj->userfault_count) {1126 obj->userfault_count = 1;1127 spin_lock(&to_i915(obj->base.dev)->runtime_pm.lmem_userfault_lock);1128 list_add(&obj->userfault_link, &to_i915(obj->base.dev)->runtime_pm.lmem_userfault_list);1129 spin_unlock(&to_i915(obj->base.dev)->runtime_pm.lmem_userfault_lock);1130 1131 GEM_WARN_ON(!i915_ttm_cpu_maps_iomem(bo->resource));1132 }1133 1134 if (wakeref && CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND != 0)1135 intel_wakeref_auto(&to_i915(obj->base.dev)->runtime_pm.userfault_wakeref,1136 msecs_to_jiffies_timeout(CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND));1137 1138 i915_ttm_adjust_lru(obj);1139 1140 dma_resv_unlock(bo->base.resv);1141 1142out_rpm:1143 if (wakeref)1144 intel_runtime_pm_put(&to_i915(obj->base.dev)->runtime_pm, wakeref);1145 1146 return ret;1147}1148 1149static int1150vm_access_ttm(struct vm_area_struct *area, unsigned long addr,1151 void *buf, int len, int write)1152{1153 struct drm_i915_gem_object *obj =1154 i915_ttm_to_gem(area->vm_private_data);1155 1156 if (i915_gem_object_is_readonly(obj) && write)1157 return -EACCES;1158 1159 return ttm_bo_vm_access(area, addr, buf, len, write);1160}1161 1162static void ttm_vm_open(struct vm_area_struct *vma)1163{1164 struct drm_i915_gem_object *obj =1165 i915_ttm_to_gem(vma->vm_private_data);1166 1167 GEM_BUG_ON(i915_ttm_is_ghost_object(vma->vm_private_data));1168 i915_gem_object_get(obj);1169}1170 1171static void ttm_vm_close(struct vm_area_struct *vma)1172{1173 struct drm_i915_gem_object *obj =1174 i915_ttm_to_gem(vma->vm_private_data);1175 1176 GEM_BUG_ON(i915_ttm_is_ghost_object(vma->vm_private_data));1177 i915_gem_object_put(obj);1178}1179 1180static const struct vm_operations_struct vm_ops_ttm = {1181 .fault = vm_fault_ttm,1182 .access = vm_access_ttm,1183 .open = ttm_vm_open,1184 .close = ttm_vm_close,1185};1186 1187static u64 i915_ttm_mmap_offset(struct drm_i915_gem_object *obj)1188{1189 /* The ttm_bo must be allocated with I915_BO_ALLOC_USER */1190 GEM_BUG_ON(!drm_mm_node_allocated(&obj->base.vma_node.vm_node));1191 1192 return drm_vma_node_offset_addr(&obj->base.vma_node);1193}1194 1195static void i915_ttm_unmap_virtual(struct drm_i915_gem_object *obj)1196{1197 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);1198 intel_wakeref_t wakeref = 0;1199 1200 assert_object_held_shared(obj);1201 1202 if (i915_ttm_cpu_maps_iomem(bo->resource)) {1203 wakeref = intel_runtime_pm_get(&to_i915(obj->base.dev)->runtime_pm);1204 1205 /* userfault_count is protected by obj lock and rpm wakeref. */1206 if (obj->userfault_count) {1207 spin_lock(&to_i915(obj->base.dev)->runtime_pm.lmem_userfault_lock);1208 list_del(&obj->userfault_link);1209 spin_unlock(&to_i915(obj->base.dev)->runtime_pm.lmem_userfault_lock);1210 obj->userfault_count = 0;1211 }1212 }1213 1214 GEM_WARN_ON(obj->userfault_count);1215 1216 ttm_bo_unmap_virtual(i915_gem_to_ttm(obj));1217 1218 if (wakeref)1219 intel_runtime_pm_put(&to_i915(obj->base.dev)->runtime_pm, wakeref);1220}1221 1222static const struct drm_i915_gem_object_ops i915_gem_ttm_obj_ops = {1223 .name = "i915_gem_object_ttm",1224 .flags = I915_GEM_OBJECT_IS_SHRINKABLE |1225 I915_GEM_OBJECT_SELF_MANAGED_SHRINK_LIST,1226 1227 .get_pages = i915_ttm_get_pages,1228 .put_pages = i915_ttm_put_pages,1229 .truncate = i915_ttm_truncate,1230 .shrink = i915_ttm_shrink,1231 1232 .adjust_lru = i915_ttm_adjust_lru,1233 .delayed_free = i915_ttm_delayed_free,1234 .migrate = i915_ttm_migrate,1235 1236 .mmap_offset = i915_ttm_mmap_offset,1237 .unmap_virtual = i915_ttm_unmap_virtual,1238 .mmap_ops = &vm_ops_ttm,1239};1240 1241void i915_ttm_bo_destroy(struct ttm_buffer_object *bo)1242{1243 struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);1244 1245 i915_gem_object_release_memory_region(obj);1246 mutex_destroy(&obj->ttm.get_io_page.lock);1247 1248 if (obj->ttm.created) {1249 /*1250 * We freely manage the shrinker LRU outide of the mm.pages life1251 * cycle. As a result when destroying the object we should be1252 * extra paranoid and ensure we remove it from the LRU, before1253 * we free the object.1254 *1255 * Touching the ttm_shrinkable outside of the object lock here1256 * should be safe now that the last GEM object ref was dropped.1257 */1258 if (obj->mm.ttm_shrinkable)1259 i915_gem_object_make_unshrinkable(obj);1260 1261 i915_ttm_backup_free(obj);1262 1263 /* This releases all gem object bindings to the backend. */1264 __i915_gem_free_object(obj);1265 1266 call_rcu(&obj->rcu, __i915_gem_free_object_rcu);1267 } else {1268 __i915_gem_object_fini(obj);1269 }1270}1271 1272/*1273 * __i915_gem_ttm_object_init - Initialize a ttm-backed i915 gem object1274 * @mem: The initial memory region for the object.1275 * @obj: The gem object.1276 * @size: Object size in bytes.1277 * @flags: gem object flags.1278 *1279 * Return: 0 on success, negative error code on failure.1280 */1281int __i915_gem_ttm_object_init(struct intel_memory_region *mem,1282 struct drm_i915_gem_object *obj,1283 resource_size_t offset,1284 resource_size_t size,1285 resource_size_t page_size,1286 unsigned int flags)1287{1288 static struct lock_class_key lock_class;1289 struct drm_i915_private *i915 = mem->i915;1290 struct ttm_operation_ctx ctx = {1291 .interruptible = true,1292 .no_wait_gpu = false,1293 };1294 enum ttm_bo_type bo_type;1295 int ret;1296 1297 drm_gem_private_object_init(&i915->drm, &obj->base, size);1298 i915_gem_object_init(obj, &i915_gem_ttm_obj_ops, &lock_class, flags);1299 1300 obj->bo_offset = offset;1301 1302 /* Don't put on a region list until we're either locked or fully initialized. */1303 obj->mm.region = mem;1304 INIT_LIST_HEAD(&obj->mm.region_link);1305 1306 INIT_RADIX_TREE(&obj->ttm.get_io_page.radix, GFP_KERNEL | __GFP_NOWARN);1307 mutex_init(&obj->ttm.get_io_page.lock);1308 bo_type = (obj->flags & I915_BO_ALLOC_USER) ? ttm_bo_type_device :1309 ttm_bo_type_kernel;1310 1311 obj->base.vma_node.driver_private = i915_gem_to_ttm(obj);1312 1313 /* Forcing the page size is kernel internal only */1314 GEM_BUG_ON(page_size && obj->mm.n_placements);1315 1316 /*1317 * Keep an extra shrink pin to prevent the object from being made1318 * shrinkable too early. If the ttm_tt is ever allocated in shmem, we1319 * drop the pin. The TTM backend manages the shrinker LRU itself,1320 * outside of the normal mm.pages life cycle.1321 */1322 i915_gem_object_make_unshrinkable(obj);1323 1324 /*1325 * If this function fails, it will call the destructor, but1326 * our caller still owns the object. So no freeing in the1327 * destructor until obj->ttm.created is true.1328 * Similarly, in delayed_destroy, we can't call ttm_bo_put()1329 * until successful initialization.1330 */1331 ret = ttm_bo_init_reserved(&i915->bdev, i915_gem_to_ttm(obj), bo_type,1332 &i915_sys_placement, page_size >> PAGE_SHIFT,1333 &ctx, NULL, NULL, i915_ttm_bo_destroy);1334 1335 /*1336 * XXX: The ttm_bo_init_reserved() functions returns -ENOSPC if the size1337 * is too big to add vma. The direct function that returns -ENOSPC is1338 * drm_mm_insert_node_in_range(). To handle the same error as other code1339 * that returns -E2BIG when the size is too large, it converts -ENOSPC to1340 * -E2BIG.1341 */1342 if (size >> PAGE_SHIFT > INT_MAX && ret == -ENOSPC)1343 ret = -E2BIG;1344 1345 if (ret)1346 return i915_ttm_err_to_gem(ret);1347 1348 obj->ttm.created = true;1349 i915_gem_object_release_memory_region(obj);1350 i915_gem_object_init_memory_region(obj, mem);1351 i915_ttm_adjust_domains_after_move(obj);1352 i915_ttm_adjust_gem_after_move(obj);1353 i915_gem_object_unlock(obj);1354 1355 return 0;1356}1357 1358static const struct intel_memory_region_ops ttm_system_region_ops = {1359 .init_object = __i915_gem_ttm_object_init,1360 .release = intel_region_ttm_fini,1361};1362 1363struct intel_memory_region *1364i915_gem_ttm_system_setup(struct drm_i915_private *i915,1365 u16 type, u16 instance)1366{1367 struct intel_memory_region *mr;1368 1369 mr = intel_memory_region_create(i915, 0,1370 totalram_pages() << PAGE_SHIFT,1371 PAGE_SIZE, 0, 0,1372 type, instance,1373 &ttm_system_region_ops);1374 if (IS_ERR(mr))1375 return mr;1376 1377 intel_memory_region_set_name(mr, "system-ttm");1378 return mr;1379}1380