OSCL-LXR linux-6.0.1/​drivers/​gpu/​drm/​i915/​gem/​i915_gem_object.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * Copyright © 2017 Intel Corporation
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the next
  * paragraph) shall be included in all copies or substantial portions of the
  * Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
  *
  */
 
 #include <linux/highmem.h>
 #include <linux/sched/mm.h>
 
 #include <drm/drm_cache.h>
 
 #include "display/intel_frontbuffer.h"
 #include "pxp/intel_pxp.h"
 
 #include "i915_drv.h"
 #include "i915_file_private.h"
 #include "i915_gem_clflush.h"
 #include "i915_gem_context.h"
 #include "i915_gem_dmabuf.h"
 #include "i915_gem_mman.h"
 #include "i915_gem_object.h"
 #include "i915_gem_ttm.h"
 #include "i915_memcpy.h"
 #include "i915_trace.h"
 
 static struct kmem_cache *slab_objects;
 
 static const struct drm_gem_object_funcs i915_gem_object_funcs;
 
 struct drm_i915_gem_object *i915_gem_object_alloc(void)
 {
     struct drm_i915_gem_object *obj;
 
     obj = kmem_cache_zalloc(slab_objects, GFP_KERNEL);
     if (!obj)
         return NULL;
     obj->base.funcs = &i915_gem_object_funcs;
 
     return obj;
 }
 
 void i915_gem_object_free(struct drm_i915_gem_object *obj)
 {
     return kmem_cache_free(slab_objects, obj);
 }
 
 void i915_gem_object_init(struct drm_i915_gem_object *obj,
               const struct drm_i915_gem_object_ops *ops,
               struct lock_class_key *key, unsigned flags)
 {
     /*
      * A gem object is embedded both in a struct ttm_buffer_object :/ and
      * in a drm_i915_gem_object. Make sure they are aliased.
      */
     BUILD_BUG_ON(offsetof(typeof(*obj), base) !=
              offsetof(typeof(*obj), __do_not_access.base));
 
     spin_lock_init(&obj->vma.lock);
     INIT_LIST_HEAD(&obj->vma.list);
 
     INIT_LIST_HEAD(&obj->mm.link);
 
     INIT_LIST_HEAD(&obj->lut_list);
     spin_lock_init(&obj->lut_lock);
 
     spin_lock_init(&obj->mmo.lock);
     obj->mmo.offsets = RB_ROOT;
 
     init_rcu_head(&obj->rcu);
 
     obj->ops = ops;
     GEM_BUG_ON(flags & ~I915_BO_ALLOC_FLAGS);
     obj->flags = flags;
 
     obj->mm.madv = I915_MADV_WILLNEED;
     INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN);
     mutex_init(&obj->mm.get_page.lock);
     INIT_RADIX_TREE(&obj->mm.get_dma_page.radix, GFP_KERNEL | __GFP_NOWARN);
     mutex_init(&obj->mm.get_dma_page.lock);
 }
 
 /**
  * __i915_gem_object_fini - Clean up a GEM object initialization
  * @obj: The gem object to cleanup
  *
  * This function cleans up gem object fields that are set up by
  * drm_gem_private_object_init() and i915_gem_object_init().
  * It's primarily intended as a helper for backends that need to
  * clean up the gem object in separate steps.
  */
 void __i915_gem_object_fini(struct drm_i915_gem_object *obj)
 {
     mutex_destroy(&obj->mm.get_page.lock);
     mutex_destroy(&obj->mm.get_dma_page.lock);
     dma_resv_fini(&obj->base._resv);
 }
 
 /**
  * i915_gem_object_set_cache_coherency - Mark up the object's coherency levels
  * for a given cache_level
  * @obj: #drm_i915_gem_object
  * @cache_level: cache level
  */
 void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
                      unsigned int cache_level)
 {
     struct drm_i915_private *i915 = to_i915(obj->base.dev);
 
     obj->cache_level = cache_level;
 
     if (cache_level != I915_CACHE_NONE)
         obj->cache_coherent = (I915_BO_CACHE_COHERENT_FOR_READ |
                        I915_BO_CACHE_COHERENT_FOR_WRITE);
     else if (HAS_LLC(i915))
         obj->cache_coherent = I915_BO_CACHE_COHERENT_FOR_READ;
     else
         obj->cache_coherent = 0;
 
     obj->cache_dirty =
         !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE) &&
         !IS_DGFX(i915);
 }
 
 bool i915_gem_object_can_bypass_llc(struct drm_i915_gem_object *obj)
 {
     struct drm_i915_private *i915 = to_i915(obj->base.dev);
 
     /*
      * This is purely from a security perspective, so we simply don't care
      * about non-userspace objects being able to bypass the LLC.
      */
     if (!(obj->flags & I915_BO_ALLOC_USER))
         return false;
 
     /*
      * EHL and JSL add the 'Bypass LLC' MOCS entry, which should make it
      * possible for userspace to bypass the GTT caching bits set by the
      * kernel, as per the given object cache_level. This is troublesome
      * since the heavy flush we apply when first gathering the pages is
      * skipped if the kernel thinks the object is coherent with the GPU. As
      * a result it might be possible to bypass the cache and read the
      * contents of the page directly, which could be stale data. If it's
      * just a case of userspace shooting themselves in the foot then so be
      * it, but since i915 takes the stance of always zeroing memory before
      * handing it to userspace, we need to prevent this.
      */
     return IS_JSL_EHL(i915);
 }
 
 static void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file)
 {
     struct drm_i915_gem_object *obj = to_intel_bo(gem);
     struct drm_i915_file_private *fpriv = file->driver_priv;
     struct i915_lut_handle bookmark = {};
     struct i915_mmap_offset *mmo, *mn;
     struct i915_lut_handle *lut, *ln;
     LIST_HEAD(close);
 
     spin_lock(&obj->lut_lock);
     list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) {
         struct i915_gem_context *ctx = lut->ctx;
 
         if (ctx && ctx->file_priv == fpriv) {
             i915_gem_context_get(ctx);
             list_move(&lut->obj_link, &close);
         }
 
         /* Break long locks, and carefully continue on from this spot */
         if (&ln->obj_link != &obj->lut_list) {
             list_add_tail(&bookmark.obj_link, &ln->obj_link);
             if (cond_resched_lock(&obj->lut_lock))
                 list_safe_reset_next(&bookmark, ln, obj_link);
             __list_del_entry(&bookmark.obj_link);
         }
     }
     spin_unlock(&obj->lut_lock);
 
     spin_lock(&obj->mmo.lock);
     rbtree_postorder_for_each_entry_safe(mmo, mn, &obj->mmo.offsets, offset)
         drm_vma_node_revoke(&mmo->vma_node, file);
     spin_unlock(&obj->mmo.lock);
 
     list_for_each_entry_safe(lut, ln, &close, obj_link) {
         struct i915_gem_context *ctx = lut->ctx;
         struct i915_vma *vma;
 
         /*
          * We allow the process to have multiple handles to the same
          * vma, in the same fd namespace, by virtue of flink/open.
          */
 
         mutex_lock(&ctx->lut_mutex);
         vma = radix_tree_delete(&ctx->handles_vma, lut->handle);
         if (vma) {
             GEM_BUG_ON(vma->obj != obj);
             GEM_BUG_ON(!atomic_read(&vma->open_count));
             i915_vma_close(vma);
         }
         mutex_unlock(&ctx->lut_mutex);
 
         i915_gem_context_put(lut->ctx);
         i915_lut_handle_free(lut);
         i915_gem_object_put(obj);
     }
 }
 
 void __i915_gem_free_object_rcu(struct rcu_head *head)
 {
     struct drm_i915_gem_object *obj =
         container_of(head, typeof(*obj), rcu);
     struct drm_i915_private *i915 = to_i915(obj->base.dev);
 
     i915_gem_object_free(obj);
 
     GEM_BUG_ON(!atomic_read(&i915->mm.free_count));
     atomic_dec(&i915->mm.free_count);
 }
 
 static void __i915_gem_object_free_mmaps(struct drm_i915_gem_object *obj)
 {
     /* Skip serialisation and waking the device if known to be not used. */
 
     if (obj->userfault_count)
         i915_gem_object_release_mmap_gtt(obj);
 
     if (!RB_EMPTY_ROOT(&obj->mmo.offsets)) {
         struct i915_mmap_offset *mmo, *mn;
 
         i915_gem_object_release_mmap_offset(obj);
 
         rbtree_postorder_for_each_entry_safe(mmo, mn,
                              &obj->mmo.offsets,
                              offset) {
             drm_vma_offset_remove(obj->base.dev->vma_offset_manager,
                           &mmo->vma_node);
             kfree(mmo);
         }
         obj->mmo.offsets = RB_ROOT;
     }
 }
 
 /**
  * __i915_gem_object_pages_fini - Clean up pages use of a gem object
  * @obj: The gem object to clean up
  *
  * This function cleans up usage of the object mm.pages member. It
  * is intended for backends that need to clean up a gem object in
  * separate steps and needs to be called when the object is idle before
  * the object's backing memory is freed.
  */
 void __i915_gem_object_pages_fini(struct drm_i915_gem_object *obj)
 {
     assert_object_held_shared(obj);
 
     if (!list_empty(&obj->vma.list)) {
         struct i915_vma *vma;
 
         spin_lock(&obj->vma.lock);
         while ((vma = list_first_entry_or_null(&obj->vma.list,
                                struct i915_vma,
                                obj_link))) {
             GEM_BUG_ON(vma->obj != obj);
             spin_unlock(&obj->vma.lock);
 
             i915_vma_destroy(vma);
 
             spin_lock(&obj->vma.lock);
         }
         spin_unlock(&obj->vma.lock);
     }
 
     __i915_gem_object_free_mmaps(obj);
 
     atomic_set(&obj->mm.pages_pin_count, 0);
     __i915_gem_object_put_pages(obj);
     GEM_BUG_ON(i915_gem_object_has_pages(obj));
 }
 
 void __i915_gem_free_object(struct drm_i915_gem_object *obj)
 {
     trace_i915_gem_object_destroy(obj);
 
     GEM_BUG_ON(!list_empty(&obj->lut_list));
 
     bitmap_free(obj->bit_17);
 
     if (obj->base.import_attach)
         drm_prime_gem_destroy(&obj->base, NULL);
 
     drm_gem_free_mmap_offset(&obj->base);
 
     if (obj->ops->release)
         obj->ops->release(obj);
 
     if (obj->mm.n_placements > 1)
         kfree(obj->mm.placements);
 
     if (obj->shares_resv_from)
         i915_vm_resv_put(obj->shares_resv_from);
 
     __i915_gem_object_fini(obj);
 }
 
 static void __i915_gem_free_objects(struct drm_i915_private *i915,
                     struct llist_node *freed)
 {
     struct drm_i915_gem_object *obj, *on;
 
     llist_for_each_entry_safe(obj, on, freed, freed) {
         might_sleep();
         if (obj->ops->delayed_free) {
             obj->ops->delayed_free(obj);
             continue;
         }
 
         __i915_gem_object_pages_fini(obj);
         __i915_gem_free_object(obj);
 
         /* But keep the pointer alive for RCU-protected lookups */
         call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
         cond_resched();
     }
 }
 
 void i915_gem_flush_free_objects(struct drm_i915_private *i915)
 {
     struct llist_node *freed = llist_del_all(&i915->mm.free_list);
 
     if (unlikely(freed))
         __i915_gem_free_objects(i915, freed);
 }
 
 static void __i915_gem_free_work(struct work_struct *work)
 {
     struct drm_i915_private *i915 =
         container_of(work, struct drm_i915_private, mm.free_work);
 
     i915_gem_flush_free_objects(i915);
 }
 
 static void i915_gem_free_object(struct drm_gem_object *gem_obj)
 {
     struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
     struct drm_i915_private *i915 = to_i915(obj->base.dev);
 
     GEM_BUG_ON(i915_gem_object_is_framebuffer(obj));
 
     /*
      * Before we free the object, make sure any pure RCU-only
      * read-side critical sections are complete, e.g.
      * i915_gem_busy_ioctl(). For the corresponding synchronized
      * lookup see i915_gem_object_lookup_rcu().
      */
     atomic_inc(&i915->mm.free_count);
 
     /*
      * Since we require blocking on struct_mutex to unbind the freed
      * object from the GPU before releasing resources back to the
      * system, we can not do that directly from the RCU callback (which may
      * be a softirq context), but must instead then defer that work onto a
      * kthread. We use the RCU callback rather than move the freed object
      * directly onto the work queue so that we can mix between using the
      * worker and performing frees directly from subsequent allocations for
      * crude but effective memory throttling.
      */
 
     if (llist_add(&obj->freed, &i915->mm.free_list))
         queue_work(i915->wq, &i915->mm.free_work);
 }
 
 void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
                      enum fb_op_origin origin)
 {
     struct intel_frontbuffer *front;
 
     front = __intel_frontbuffer_get(obj);
     if (front) {
         intel_frontbuffer_flush(front, origin);
         intel_frontbuffer_put(front);
     }
 }
 
 void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
                           enum fb_op_origin origin)
 {
     struct intel_frontbuffer *front;
 
     front = __intel_frontbuffer_get(obj);
     if (front) {
         intel_frontbuffer_invalidate(front, origin);
         intel_frontbuffer_put(front);
     }
 }
 
 static void
 i915_gem_object_read_from_page_kmap(struct drm_i915_gem_object *obj, u64 offset, void *dst, int size)
 {
     void *src_map;
     void *src_ptr;
 
     src_map = kmap_atomic(i915_gem_object_get_page(obj, offset >> PAGE_SHIFT));
 
     src_ptr = src_map + offset_in_page(offset);
     if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ))
         drm_clflush_virt_range(src_ptr, size);
     memcpy(dst, src_ptr, size);
 
     kunmap_atomic(src_map);
 }
 
 static void
 i915_gem_object_read_from_page_iomap(struct drm_i915_gem_object *obj, u64 offset, void *dst, int size)
 {
     void __iomem *src_map;
     void __iomem *src_ptr;
     dma_addr_t dma = i915_gem_object_get_dma_address(obj, offset >> PAGE_SHIFT);
 
     src_map = io_mapping_map_wc(&obj->mm.region->iomap,
                     dma - obj->mm.region->region.start,
                     PAGE_SIZE);
 
     src_ptr = src_map + offset_in_page(offset);
     if (!i915_memcpy_from_wc(dst, (void __force *)src_ptr, size))
         memcpy_fromio(dst, src_ptr, size);
 
     io_mapping_unmap(src_map);
 }
 
 /**
  * i915_gem_object_read_from_page - read data from the page of a GEM object
  * @obj: GEM object to read from
  * @offset: offset within the object
  * @dst: buffer to store the read data
  * @size: size to read
  *
  * Reads data from @obj at the specified offset. The requested region to read
  * from can't cross a page boundary. The caller must ensure that @obj pages
  * are pinned and that @obj is synced wrt. any related writes.
  *
  * Return: %0 on success or -ENODEV if the type of @obj's backing store is
  * unsupported.
  */
 int i915_gem_object_read_from_page(struct drm_i915_gem_object *obj, u64 offset, void *dst, int size)
 {
     GEM_BUG_ON(offset >= obj->base.size);
     GEM_BUG_ON(offset_in_page(offset) > PAGE_SIZE - size);
     GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
 
     if (i915_gem_object_has_struct_page(obj))
         i915_gem_object_read_from_page_kmap(obj, offset, dst, size);
     else if (i915_gem_object_has_iomem(obj))
         i915_gem_object_read_from_page_iomap(obj, offset, dst, size);
     else
         return -ENODEV;
 
     return 0;
 }
 
 /**
  * i915_gem_object_evictable - Whether object is likely evictable after unbind.
  * @obj: The object to check
  *
  * This function checks whether the object is likely unvictable after unbind.
  * If the object is not locked when checking, the result is only advisory.
  * If the object is locked when checking, and the function returns true,
  * then an eviction should indeed be possible. But since unlocked vma
  * unpinning and unbinding is currently possible, the object can actually
  * become evictable even if this function returns false.
  *
  * Return: true if the object may be evictable. False otherwise.
  */
 bool i915_gem_object_evictable(struct drm_i915_gem_object *obj)
 {
     struct i915_vma *vma;
     int pin_count = atomic_read(&obj->mm.pages_pin_count);
 
     if (!pin_count)
         return true;
 
     spin_lock(&obj->vma.lock);
     list_for_each_entry(vma, &obj->vma.list, obj_link) {
         if (i915_vma_is_pinned(vma)) {
             spin_unlock(&obj->vma.lock);
             return false;
         }
         if (atomic_read(&vma->pages_count))
             pin_count--;
     }
     spin_unlock(&obj->vma.lock);
     GEM_WARN_ON(pin_count < 0);
 
     return pin_count == 0;
 }
 
 /**
  * i915_gem_object_migratable - Whether the object is migratable out of the
  * current region.
  * @obj: Pointer to the object.
  *
  * Return: Whether the object is allowed to be resident in other
  * regions than the current while pages are present.
  */
 bool i915_gem_object_migratable(struct drm_i915_gem_object *obj)
 {
     struct intel_memory_region *mr = READ_ONCE(obj->mm.region);
 
     if (!mr)
         return false;
 
     return obj->mm.n_placements > 1;
 }
 
 /**
  * i915_gem_object_has_struct_page - Whether the object is page-backed
  * @obj: The object to query.
  *
  * This function should only be called while the object is locked or pinned,
  * otherwise the page backing may change under the caller.
  *
  * Return: True if page-backed, false otherwise.
  */
 bool i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj)
 {
 #ifdef CONFIG_LOCKDEP
     if (IS_DGFX(to_i915(obj->base.dev)) &&
         i915_gem_object_evictable((void __force *)obj))
         assert_object_held_shared(obj);
 #endif
     return obj->mem_flags & I915_BO_FLAG_STRUCT_PAGE;
 }
 
 /**
  * i915_gem_object_has_iomem - Whether the object is iomem-backed
  * @obj: The object to query.
  *
  * This function should only be called while the object is locked or pinned,
  * otherwise the iomem backing may change under the caller.
  *
  * Return: True if iomem-backed, false otherwise.
  */
 bool i915_gem_object_has_iomem(const struct drm_i915_gem_object *obj)
 {
 #ifdef CONFIG_LOCKDEP
     if (IS_DGFX(to_i915(obj->base.dev)) &&
         i915_gem_object_evictable((void __force *)obj))
         assert_object_held_shared(obj);
 #endif
     return obj->mem_flags & I915_BO_FLAG_IOMEM;
 }
 
 /**
  * i915_gem_object_can_migrate - Whether an object likely can be migrated
  *
  * @obj: The object to migrate
  * @id: The region intended to migrate to
  *
  * Check whether the object backend supports migration to the
  * given region. Note that pinning may affect the ability to migrate as
  * returned by this function.
  *
  * This function is primarily intended as a helper for checking the
  * possibility to migrate objects and might be slightly less permissive
  * than i915_gem_object_migrate() when it comes to objects with the
  * I915_BO_ALLOC_USER flag set.
  *
  * Return: true if migration is possible, false otherwise.
  */
 bool i915_gem_object_can_migrate(struct drm_i915_gem_object *obj,
                  enum intel_region_id id)
 {
     struct drm_i915_private *i915 = to_i915(obj->base.dev);
     unsigned int num_allowed = obj->mm.n_placements;
     struct intel_memory_region *mr;
     unsigned int i;
 
     GEM_BUG_ON(id >= INTEL_REGION_UNKNOWN);
     GEM_BUG_ON(obj->mm.madv != I915_MADV_WILLNEED);
 
     mr = i915->mm.regions[id];
     if (!mr)
         return false;
 
     if (!IS_ALIGNED(obj->base.size, mr->min_page_size))
         return false;
 
     if (obj->mm.region == mr)
         return true;
 
     if (!i915_gem_object_evictable(obj))
         return false;
 
     if (!obj->ops->migrate)
         return false;
 
     if (!(obj->flags & I915_BO_ALLOC_USER))
         return true;
 
     if (num_allowed == 0)
         return false;
 
     for (i = 0; i < num_allowed; ++i) {
         if (mr == obj->mm.placements[i])
             return true;
     }
 
     return false;
 }
 
 /**
  * i915_gem_object_migrate - Migrate an object to the desired region id
  * @obj: The object to migrate.
  * @ww: An optional struct i915_gem_ww_ctx. If NULL, the backend may
  * not be successful in evicting other objects to make room for this object.
  * @id: The region id to migrate to.
  *
  * Attempt to migrate the object to the desired memory region. The
  * object backend must support migration and the object may not be
  * pinned, (explicitly pinned pages or pinned vmas). The object must
  * be locked.
  * On successful completion, the object will have pages pointing to
  * memory in the new region, but an async migration task may not have
  * completed yet, and to accomplish that, i915_gem_object_wait_migration()
  * must be called.
  *
  * Note: the @ww parameter is not used yet, but included to make sure
  * callers put some effort into obtaining a valid ww ctx if one is
  * available.
  *
  * Return: 0 on success. Negative error code on failure. In particular may
  * return -ENXIO on lack of region space, -EDEADLK for deadlock avoidance
  * if @ww is set, -EINTR or -ERESTARTSYS if signal pending, and
  * -EBUSY if the object is pinned.
  */
 int i915_gem_object_migrate(struct drm_i915_gem_object *obj,
                 struct i915_gem_ww_ctx *ww,
                 enum intel_region_id id)
 {
     struct drm_i915_private *i915 = to_i915(obj->base.dev);
     struct intel_memory_region *mr;
 
     GEM_BUG_ON(id >= INTEL_REGION_UNKNOWN);
     GEM_BUG_ON(obj->mm.madv != I915_MADV_WILLNEED);
     assert_object_held(obj);
 
     mr = i915->mm.regions[id];
     GEM_BUG_ON(!mr);
 
     if (!i915_gem_object_can_migrate(obj, id))
         return -EINVAL;
 
     if (!obj->ops->migrate) {
         if (GEM_WARN_ON(obj->mm.region != mr))
             return -EINVAL;
         return 0;
     }
 
     return obj->ops->migrate(obj, mr);
 }
 
 /**
  * i915_gem_object_placement_possible - Check whether the object can be
  * placed at certain memory type
  * @obj: Pointer to the object
  * @type: The memory type to check
  *
  * Return: True if the object can be placed in @type. False otherwise.
  */
 bool i915_gem_object_placement_possible(struct drm_i915_gem_object *obj,
                     enum intel_memory_type type)
 {
     unsigned int i;
 
     if (!obj->mm.n_placements) {
         switch (type) {
         case INTEL_MEMORY_LOCAL:
             return i915_gem_object_has_iomem(obj);
         case INTEL_MEMORY_SYSTEM:
             return i915_gem_object_has_pages(obj);
         default:
             /* Ignore stolen for now */
             GEM_BUG_ON(1);
             return false;
         }
     }
 
     for (i = 0; i < obj->mm.n_placements; i++) {
         if (obj->mm.placements[i]->type == type)
             return true;
     }
 
     return false;
 }
 
 /**
  * i915_gem_object_needs_ccs_pages - Check whether the object requires extra
  * pages when placed in system-memory, in order to save and later restore the
  * flat-CCS aux state when the object is moved between local-memory and
  * system-memory
  * @obj: Pointer to the object
  *
  * Return: True if the object needs extra ccs pages. False otherwise.
  */
 bool i915_gem_object_needs_ccs_pages(struct drm_i915_gem_object *obj)
 {
     bool lmem_placement = false;
     int i;
 
     if (!HAS_FLAT_CCS(to_i915(obj->base.dev)))
         return false;
 
     for (i = 0; i < obj->mm.n_placements; i++) {
         /* Compression is not allowed for the objects with smem placement */
         if (obj->mm.placements[i]->type == INTEL_MEMORY_SYSTEM)
             return false;
         if (!lmem_placement &&
             obj->mm.placements[i]->type == INTEL_MEMORY_LOCAL)
             lmem_placement = true;
     }
 
     return lmem_placement;
 }
 
 void i915_gem_init__objects(struct drm_i915_private *i915)
 {
     INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
 }
 
 void i915_objects_module_exit(void)
 {
     kmem_cache_destroy(slab_objects);
 }
 
 int __init i915_objects_module_init(void)
 {
     slab_objects = KMEM_CACHE(drm_i915_gem_object, SLAB_HWCACHE_ALIGN);
     if (!slab_objects)
         return -ENOMEM;
 
     return 0;
 }
 
 static const struct drm_gem_object_funcs i915_gem_object_funcs = {
     .free = i915_gem_free_object,
     .close = i915_gem_close_object,
     .export = i915_gem_prime_export,
 };
 
 /**
  * i915_gem_object_get_moving_fence - Get the object's moving fence if any
  * @obj: The object whose moving fence to get.
  * @fence: The resulting fence
  *
  * A non-signaled moving fence means that there is an async operation
  * pending on the object that needs to be waited on before setting up
  * any GPU- or CPU PTEs to the object's pages.
  *
  * Return: Negative error code or 0 for success.
  */
 int i915_gem_object_get_moving_fence(struct drm_i915_gem_object *obj,
                      struct dma_fence **fence)
 {
     return dma_resv_get_singleton(obj->base.resv, DMA_RESV_USAGE_KERNEL,
                       fence);
 }
 
 /**
  * i915_gem_object_wait_moving_fence - Wait for the object's moving fence if any
  * @obj: The object whose moving fence to wait for.
  * @intr: Whether to wait interruptible.
  *
  * If the moving fence signaled without an error, it is detached from the
  * object and put.
  *
  * Return: 0 if successful, -ERESTARTSYS if the wait was interrupted,
  * negative error code if the async operation represented by the
  * moving fence failed.
  */
 int i915_gem_object_wait_moving_fence(struct drm_i915_gem_object *obj,
                       bool intr)
 {
     long ret;
 
     assert_object_held(obj);
 
     ret = dma_resv_wait_timeout(obj->base. resv, DMA_RESV_USAGE_KERNEL,
                     intr, MAX_SCHEDULE_TIMEOUT);
     if (!ret)
         ret = -ETIME;
     else if (ret > 0 && i915_gem_object_has_unknown_state(obj))
         ret = -EIO;
 
     return ret < 0 ? ret : 0;
 }
 
 /**
  * i915_gem_object_has_unknown_state - Return true if the object backing pages are
  * in an unknown_state. This means that userspace must NEVER be allowed to touch
  * the pages, with either the GPU or CPU.
  *
  * ONLY valid to be called after ensuring that all kernel fences have signalled
  * (in particular the fence for moving/clearing the object).
  */
 bool i915_gem_object_has_unknown_state(struct drm_i915_gem_object *obj)
 {
     /*
      * The below barrier pairs with the dma_fence_signal() in
      * __memcpy_work(). We should only sample the unknown_state after all
      * the kernel fences have signalled.
      */
     smp_rmb();
     return obj->mm.unknown_state;
 }
 
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "selftests/huge_gem_object.c"
 #include "selftests/huge_pages.c"
 #include "selftests/i915_gem_migrate.c"
 #include "selftests/i915_gem_object.c"
 #include "selftests/i915_gem_coherency.c"
 #endif

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