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 // SPDX-License-Identifier: GPL-2.0 OR MIT
 /**************************************************************************
  *
  * Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA
  *
  * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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 <drm/ttm/ttm_placement.h>
 
 #include "vmwgfx_resource_priv.h"
 #include "vmwgfx_binding.h"
 #include "vmwgfx_drv.h"
 
 #define VMW_RES_EVICT_ERR_COUNT 10
 
 /**
  * vmw_resource_mob_attach - Mark a resource as attached to its backing mob
  * @res: The resource
  */
 void vmw_resource_mob_attach(struct vmw_resource *res)
 {
     struct vmw_buffer_object *backup = res->backup;
     struct rb_node **new = &backup->res_tree.rb_node, *parent = NULL;
 
     dma_resv_assert_held(res->backup->base.base.resv);
     res->used_prio = (res->res_dirty) ? res->func->dirty_prio :
         res->func->prio;
 
     while (*new) {
         struct vmw_resource *this =
             container_of(*new, struct vmw_resource, mob_node);
 
         parent = *new;
         new = (res->backup_offset < this->backup_offset) ?
             &((*new)->rb_left) : &((*new)->rb_right);
     }
 
     rb_link_node(&res->mob_node, parent, new);
     rb_insert_color(&res->mob_node, &backup->res_tree);
 
     vmw_bo_prio_add(backup, res->used_prio);
 }
 
 /**
  * vmw_resource_mob_detach - Mark a resource as detached from its backing mob
  * @res: The resource
  */
 void vmw_resource_mob_detach(struct vmw_resource *res)
 {
     struct vmw_buffer_object *backup = res->backup;
 
     dma_resv_assert_held(backup->base.base.resv);
     if (vmw_resource_mob_attached(res)) {
         rb_erase(&res->mob_node, &backup->res_tree);
         RB_CLEAR_NODE(&res->mob_node);
         vmw_bo_prio_del(backup, res->used_prio);
     }
 }
 
 struct vmw_resource *vmw_resource_reference(struct vmw_resource *res)
 {
     kref_get(&res->kref);
     return res;
 }
 
 struct vmw_resource *
 vmw_resource_reference_unless_doomed(struct vmw_resource *res)
 {
     return kref_get_unless_zero(&res->kref) ? res : NULL;
 }
 
 /**
  * vmw_resource_release_id - release a resource id to the id manager.
  *
  * @res: Pointer to the resource.
  *
  * Release the resource id to the resource id manager and set it to -1
  */
 void vmw_resource_release_id(struct vmw_resource *res)
 {
     struct vmw_private *dev_priv = res->dev_priv;
     struct idr *idr = &dev_priv->res_idr[res->func->res_type];
 
     spin_lock(&dev_priv->resource_lock);
     if (res->id != -1)
         idr_remove(idr, res->id);
     res->id = -1;
     spin_unlock(&dev_priv->resource_lock);
 }
 
 static void vmw_resource_release(struct kref *kref)
 {
     struct vmw_resource *res =
         container_of(kref, struct vmw_resource, kref);
     struct vmw_private *dev_priv = res->dev_priv;
     int id;
     int ret;
     struct idr *idr = &dev_priv->res_idr[res->func->res_type];
 
     spin_lock(&dev_priv->resource_lock);
     list_del_init(&res->lru_head);
     spin_unlock(&dev_priv->resource_lock);
     if (res->backup) {
         struct ttm_buffer_object *bo = &res->backup->base;
 
         ret = ttm_bo_reserve(bo, false, false, NULL);
         BUG_ON(ret);
         if (vmw_resource_mob_attached(res) &&
             res->func->unbind != NULL) {
             struct ttm_validate_buffer val_buf;
 
             val_buf.bo = bo;
             val_buf.num_shared = 0;
             res->func->unbind(res, false, &val_buf);
         }
         res->backup_dirty = false;
         vmw_resource_mob_detach(res);
         if (res->dirty)
             res->func->dirty_free(res);
         if (res->coherent)
             vmw_bo_dirty_release(res->backup);
         ttm_bo_unreserve(bo);
         vmw_bo_unreference(&res->backup);
     }
 
     if (likely(res->hw_destroy != NULL)) {
         mutex_lock(&dev_priv->binding_mutex);
         vmw_binding_res_list_kill(&res->binding_head);
         mutex_unlock(&dev_priv->binding_mutex);
         res->hw_destroy(res);
     }
 
     id = res->id;
     if (res->res_free != NULL)
         res->res_free(res);
     else
         kfree(res);
 
     spin_lock(&dev_priv->resource_lock);
     if (id != -1)
         idr_remove(idr, id);
     spin_unlock(&dev_priv->resource_lock);
 }
 
 void vmw_resource_unreference(struct vmw_resource **p_res)
 {
     struct vmw_resource *res = *p_res;
 
     *p_res = NULL;
     kref_put(&res->kref, vmw_resource_release);
 }
 
 
 /**
  * vmw_resource_alloc_id - release a resource id to the id manager.
  *
  * @res: Pointer to the resource.
  *
  * Allocate the lowest free resource from the resource manager, and set
  * @res->id to that id. Returns 0 on success and -ENOMEM on failure.
  */
 int vmw_resource_alloc_id(struct vmw_resource *res)
 {
     struct vmw_private *dev_priv = res->dev_priv;
     int ret;
     struct idr *idr = &dev_priv->res_idr[res->func->res_type];
 
     BUG_ON(res->id != -1);
 
     idr_preload(GFP_KERNEL);
     spin_lock(&dev_priv->resource_lock);
 
     ret = idr_alloc(idr, res, 1, 0, GFP_NOWAIT);
     if (ret >= 0)
         res->id = ret;
 
     spin_unlock(&dev_priv->resource_lock);
     idr_preload_end();
     return ret < 0 ? ret : 0;
 }
 
 /**
  * vmw_resource_init - initialize a struct vmw_resource
  *
  * @dev_priv:       Pointer to a device private struct.
  * @res:            The struct vmw_resource to initialize.
  * @delay_id:       Boolean whether to defer device id allocation until
  *                  the first validation.
  * @res_free:       Resource destructor.
  * @func:           Resource function table.
  */
 int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
               bool delay_id,
               void (*res_free) (struct vmw_resource *res),
               const struct vmw_res_func *func)
 {
     kref_init(&res->kref);
     res->hw_destroy = NULL;
     res->res_free = res_free;
     res->dev_priv = dev_priv;
     res->func = func;
     RB_CLEAR_NODE(&res->mob_node);
     INIT_LIST_HEAD(&res->lru_head);
     INIT_LIST_HEAD(&res->binding_head);
     res->id = -1;
     res->backup = NULL;
     res->backup_offset = 0;
     res->backup_dirty = false;
     res->res_dirty = false;
     res->coherent = false;
     res->used_prio = 3;
     res->dirty = NULL;
     if (delay_id)
         return 0;
     else
         return vmw_resource_alloc_id(res);
 }
 
 
 /**
  * vmw_user_resource_lookup_handle - lookup a struct resource from a
  * TTM user-space handle and perform basic type checks
  *
  * @dev_priv:     Pointer to a device private struct
  * @tfile:        Pointer to a struct ttm_object_file identifying the caller
  * @handle:       The TTM user-space handle
  * @converter:    Pointer to an object describing the resource type
  * @p_res:        On successful return the location pointed to will contain
  *                a pointer to a refcounted struct vmw_resource.
  *
  * If the handle can't be found or is associated with an incorrect resource
  * type, -EINVAL will be returned.
  */
 int vmw_user_resource_lookup_handle(struct vmw_private *dev_priv,
                     struct ttm_object_file *tfile,
                     uint32_t handle,
                     const struct vmw_user_resource_conv
                     *converter,
                     struct vmw_resource **p_res)
 {
     struct ttm_base_object *base;
     struct vmw_resource *res;
     int ret = -EINVAL;
 
     base = ttm_base_object_lookup(tfile, handle);
     if (unlikely(base == NULL))
         return -EINVAL;
 
     if (unlikely(ttm_base_object_type(base) != converter->object_type))
         goto out_bad_resource;
 
     res = converter->base_obj_to_res(base);
     kref_get(&res->kref);
 
     *p_res = res;
     ret = 0;
 
 out_bad_resource:
     ttm_base_object_unref(&base);
 
     return ret;
 }
 
 /**
  * vmw_user_resource_noref_lookup_handle - lookup a struct resource from a
  * TTM user-space handle and perform basic type checks
  *
  * @dev_priv:     Pointer to a device private struct
  * @tfile:        Pointer to a struct ttm_object_file identifying the caller
  * @handle:       The TTM user-space handle
  * @converter:    Pointer to an object describing the resource type
  *
  * If the handle can't be found or is associated with an incorrect resource
  * type, -EINVAL will be returned.
  */
 struct vmw_resource *
 vmw_user_resource_noref_lookup_handle(struct vmw_private *dev_priv,
                       struct ttm_object_file *tfile,
                       uint32_t handle,
                       const struct vmw_user_resource_conv
                       *converter)
 {
     struct ttm_base_object *base;
 
     base = ttm_base_object_noref_lookup(tfile, handle);
     if (!base)
         return ERR_PTR(-ESRCH);
 
     if (unlikely(ttm_base_object_type(base) != converter->object_type)) {
         ttm_base_object_noref_release();
         return ERR_PTR(-EINVAL);
     }
 
     return converter->base_obj_to_res(base);
 }
 
 /*
  * Helper function that looks either a surface or bo.
  *
  * The pointer this pointed at by out_surf and out_buf needs to be null.
  */
 int vmw_user_lookup_handle(struct vmw_private *dev_priv,
                struct drm_file *filp,
                uint32_t handle,
                struct vmw_surface **out_surf,
                struct vmw_buffer_object **out_buf)
 {
     struct ttm_object_file *tfile = vmw_fpriv(filp)->tfile;
     struct vmw_resource *res;
     int ret;
 
     BUG_ON(*out_surf || *out_buf);
 
     ret = vmw_user_resource_lookup_handle(dev_priv, tfile, handle,
                           user_surface_converter,
                           &res);
     if (!ret) {
         *out_surf = vmw_res_to_srf(res);
         return 0;
     }
 
     *out_surf = NULL;
     ret = vmw_user_bo_lookup(filp, handle, out_buf);
     return ret;
 }
 
 /**
  * vmw_resource_buf_alloc - Allocate a backup buffer for a resource.
  *
  * @res:            The resource for which to allocate a backup buffer.
  * @interruptible:  Whether any sleeps during allocation should be
  *                  performed while interruptible.
  */
 static int vmw_resource_buf_alloc(struct vmw_resource *res,
                   bool interruptible)
 {
     unsigned long size = PFN_ALIGN(res->backup_size);
     struct vmw_buffer_object *backup;
     int ret;
 
     if (likely(res->backup)) {
         BUG_ON(res->backup->base.base.size < size);
         return 0;
     }
 
     ret = vmw_bo_create(res->dev_priv, res->backup_size,
                 res->func->backup_placement,
                 interruptible, false,
                 &vmw_bo_bo_free, &backup);
     if (unlikely(ret != 0))
         goto out_no_bo;
 
     res->backup = backup;
 
 out_no_bo:
     return ret;
 }
 
 /**
  * vmw_resource_do_validate - Make a resource up-to-date and visible
  *                            to the device.
  *
  * @res:            The resource to make visible to the device.
  * @val_buf:        Information about a buffer possibly
  *                  containing backup data if a bind operation is needed.
  * @dirtying:       Transfer dirty regions.
  *
  * On hardware resource shortage, this function returns -EBUSY and
  * should be retried once resources have been freed up.
  */
 static int vmw_resource_do_validate(struct vmw_resource *res,
                     struct ttm_validate_buffer *val_buf,
                     bool dirtying)
 {
     int ret = 0;
     const struct vmw_res_func *func = res->func;
 
     if (unlikely(res->id == -1)) {
         ret = func->create(res);
         if (unlikely(ret != 0))
             return ret;
     }
 
     if (func->bind &&
         ((func->needs_backup && !vmw_resource_mob_attached(res) &&
           val_buf->bo != NULL) ||
          (!func->needs_backup && val_buf->bo != NULL))) {
         ret = func->bind(res, val_buf);
         if (unlikely(ret != 0))
             goto out_bind_failed;
         if (func->needs_backup)
             vmw_resource_mob_attach(res);
     }
 
     /*
      * Handle the case where the backup mob is marked coherent but
      * the resource isn't.
      */
     if (func->dirty_alloc && vmw_resource_mob_attached(res) &&
         !res->coherent) {
         if (res->backup->dirty && !res->dirty) {
             ret = func->dirty_alloc(res);
             if (ret)
                 return ret;
         } else if (!res->backup->dirty && res->dirty) {
             func->dirty_free(res);
         }
     }
 
     /*
      * Transfer the dirty regions to the resource and update
      * the resource.
      */
     if (res->dirty) {
         if (dirtying && !res->res_dirty) {
             pgoff_t start = res->backup_offset >> PAGE_SHIFT;
             pgoff_t end = __KERNEL_DIV_ROUND_UP
                 (res->backup_offset + res->backup_size,
                  PAGE_SIZE);
 
             vmw_bo_dirty_unmap(res->backup, start, end);
         }
 
         vmw_bo_dirty_transfer_to_res(res);
         return func->dirty_sync(res);
     }
 
     return 0;
 
 out_bind_failed:
     func->destroy(res);
 
     return ret;
 }
 
 /**
  * vmw_resource_unreserve - Unreserve a resource previously reserved for
  * command submission.
  *
  * @res:               Pointer to the struct vmw_resource to unreserve.
  * @dirty_set:         Change dirty status of the resource.
  * @dirty:             When changing dirty status indicates the new status.
  * @switch_backup:     Backup buffer has been switched.
  * @new_backup:        Pointer to new backup buffer if command submission
  *                     switched. May be NULL.
  * @new_backup_offset: New backup offset if @switch_backup is true.
  *
  * Currently unreserving a resource means putting it back on the device's
  * resource lru list, so that it can be evicted if necessary.
  */
 void vmw_resource_unreserve(struct vmw_resource *res,
                 bool dirty_set,
                 bool dirty,
                 bool switch_backup,
                 struct vmw_buffer_object *new_backup,
                 unsigned long new_backup_offset)
 {
     struct vmw_private *dev_priv = res->dev_priv;
 
     if (!list_empty(&res->lru_head))
         return;
 
     if (switch_backup && new_backup != res->backup) {
         if (res->backup) {
             vmw_resource_mob_detach(res);
             if (res->coherent)
                 vmw_bo_dirty_release(res->backup);
             vmw_bo_unreference(&res->backup);
         }
 
         if (new_backup) {
             res->backup = vmw_bo_reference(new_backup);
 
             /*
              * The validation code should already have added a
              * dirty tracker here.
              */
             WARN_ON(res->coherent && !new_backup->dirty);
 
             vmw_resource_mob_attach(res);
         } else {
             res->backup = NULL;
         }
     } else if (switch_backup && res->coherent) {
         vmw_bo_dirty_release(res->backup);
     }
 
     if (switch_backup)
         res->backup_offset = new_backup_offset;
 
     if (dirty_set)
         res->res_dirty = dirty;
 
     if (!res->func->may_evict || res->id == -1 || res->pin_count)
         return;
 
     spin_lock(&dev_priv->resource_lock);
     list_add_tail(&res->lru_head,
               &res->dev_priv->res_lru[res->func->res_type]);
     spin_unlock(&dev_priv->resource_lock);
 }
 
 /**
  * vmw_resource_check_buffer - Check whether a backup buffer is needed
  *                             for a resource and in that case, allocate
  *                             one, reserve and validate it.
  *
  * @ticket:         The ww aqcquire context to use, or NULL if trylocking.
  * @res:            The resource for which to allocate a backup buffer.
  * @interruptible:  Whether any sleeps during allocation should be
  *                  performed while interruptible.
  * @val_buf:        On successful return contains data about the
  *                  reserved and validated backup buffer.
  */
 static int
 vmw_resource_check_buffer(struct ww_acquire_ctx *ticket,
               struct vmw_resource *res,
               bool interruptible,
               struct ttm_validate_buffer *val_buf)
 {
     struct ttm_operation_ctx ctx = { true, false };
     struct list_head val_list;
     bool backup_dirty = false;
     int ret;
 
     if (unlikely(res->backup == NULL)) {
         ret = vmw_resource_buf_alloc(res, interruptible);
         if (unlikely(ret != 0))
             return ret;
     }
 
     INIT_LIST_HEAD(&val_list);
     ttm_bo_get(&res->backup->base);
     val_buf->bo = &res->backup->base;
     val_buf->num_shared = 0;
     list_add_tail(&val_buf->head, &val_list);
     ret = ttm_eu_reserve_buffers(ticket, &val_list, interruptible, NULL);
     if (unlikely(ret != 0))
         goto out_no_reserve;
 
     if (res->func->needs_backup && !vmw_resource_mob_attached(res))
         return 0;
 
     backup_dirty = res->backup_dirty;
     ret = ttm_bo_validate(&res->backup->base,
                   res->func->backup_placement,
                   &ctx);
 
     if (unlikely(ret != 0))
         goto out_no_validate;
 
     return 0;
 
 out_no_validate:
     ttm_eu_backoff_reservation(ticket, &val_list);
 out_no_reserve:
     ttm_bo_put(val_buf->bo);
     val_buf->bo = NULL;
     if (backup_dirty)
         vmw_bo_unreference(&res->backup);
 
     return ret;
 }
 
 /*
  * vmw_resource_reserve - Reserve a resource for command submission
  *
  * @res:            The resource to reserve.
  *
  * This function takes the resource off the LRU list and make sure
  * a backup buffer is present for guest-backed resources. However,
  * the buffer may not be bound to the resource at this point.
  *
  */
 int vmw_resource_reserve(struct vmw_resource *res, bool interruptible,
              bool no_backup)
 {
     struct vmw_private *dev_priv = res->dev_priv;
     int ret;
 
     spin_lock(&dev_priv->resource_lock);
     list_del_init(&res->lru_head);
     spin_unlock(&dev_priv->resource_lock);
 
     if (res->func->needs_backup && res->backup == NULL &&
         !no_backup) {
         ret = vmw_resource_buf_alloc(res, interruptible);
         if (unlikely(ret != 0)) {
             DRM_ERROR("Failed to allocate a backup buffer "
                   "of size %lu. bytes\n",
                   (unsigned long) res->backup_size);
             return ret;
         }
     }
 
     return 0;
 }
 
 /**
  * vmw_resource_backoff_reservation - Unreserve and unreference a
  *                                    backup buffer
  *.
  * @ticket:         The ww acquire ctx used for reservation.
  * @val_buf:        Backup buffer information.
  */
 static void
 vmw_resource_backoff_reservation(struct ww_acquire_ctx *ticket,
                  struct ttm_validate_buffer *val_buf)
 {
     struct list_head val_list;
 
     if (likely(val_buf->bo == NULL))
         return;
 
     INIT_LIST_HEAD(&val_list);
     list_add_tail(&val_buf->head, &val_list);
     ttm_eu_backoff_reservation(ticket, &val_list);
     ttm_bo_put(val_buf->bo);
     val_buf->bo = NULL;
 }
 
 /**
  * vmw_resource_do_evict - Evict a resource, and transfer its data
  *                         to a backup buffer.
  *
  * @ticket:         The ww acquire ticket to use, or NULL if trylocking.
  * @res:            The resource to evict.
  * @interruptible:  Whether to wait interruptible.
  */
 static int vmw_resource_do_evict(struct ww_acquire_ctx *ticket,
                  struct vmw_resource *res, bool interruptible)
 {
     struct ttm_validate_buffer val_buf;
     const struct vmw_res_func *func = res->func;
     int ret;
 
     BUG_ON(!func->may_evict);
 
     val_buf.bo = NULL;
     val_buf.num_shared = 0;
     ret = vmw_resource_check_buffer(ticket, res, interruptible, &val_buf);
     if (unlikely(ret != 0))
         return ret;
 
     if (unlikely(func->unbind != NULL &&
              (!func->needs_backup || vmw_resource_mob_attached(res)))) {
         ret = func->unbind(res, res->res_dirty, &val_buf);
         if (unlikely(ret != 0))
             goto out_no_unbind;
         vmw_resource_mob_detach(res);
     }
     ret = func->destroy(res);
     res->backup_dirty = true;
     res->res_dirty = false;
 out_no_unbind:
     vmw_resource_backoff_reservation(ticket, &val_buf);
 
     return ret;
 }
 
 
 /**
  * vmw_resource_validate - Make a resource up-to-date and visible
  *                         to the device.
  * @res: The resource to make visible to the device.
  * @intr: Perform waits interruptible if possible.
  * @dirtying: Pending GPU operation will dirty the resource
  *
  * On succesful return, any backup DMA buffer pointed to by @res->backup will
  * be reserved and validated.
  * On hardware resource shortage, this function will repeatedly evict
  * resources of the same type until the validation succeeds.
  *
  * Return: Zero on success, -ERESTARTSYS if interrupted, negative error code
  * on failure.
  */
 int vmw_resource_validate(struct vmw_resource *res, bool intr,
               bool dirtying)
 {
     int ret;
     struct vmw_resource *evict_res;
     struct vmw_private *dev_priv = res->dev_priv;
     struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type];
     struct ttm_validate_buffer val_buf;
     unsigned err_count = 0;
 
     if (!res->func->create)
         return 0;
 
     val_buf.bo = NULL;
     val_buf.num_shared = 0;
     if (res->backup)
         val_buf.bo = &res->backup->base;
     do {
         ret = vmw_resource_do_validate(res, &val_buf, dirtying);
         if (likely(ret != -EBUSY))
             break;
 
         spin_lock(&dev_priv->resource_lock);
         if (list_empty(lru_list) || !res->func->may_evict) {
             DRM_ERROR("Out of device device resources "
                   "for %s.\n", res->func->type_name);
             ret = -EBUSY;
             spin_unlock(&dev_priv->resource_lock);
             break;
         }
 
         evict_res = vmw_resource_reference
             (list_first_entry(lru_list, struct vmw_resource,
                       lru_head));
         list_del_init(&evict_res->lru_head);
 
         spin_unlock(&dev_priv->resource_lock);
 
         /* Trylock backup buffers with a NULL ticket. */
         ret = vmw_resource_do_evict(NULL, evict_res, intr);
         if (unlikely(ret != 0)) {
             spin_lock(&dev_priv->resource_lock);
             list_add_tail(&evict_res->lru_head, lru_list);
             spin_unlock(&dev_priv->resource_lock);
             if (ret == -ERESTARTSYS ||
                 ++err_count > VMW_RES_EVICT_ERR_COUNT) {
                 vmw_resource_unreference(&evict_res);
                 goto out_no_validate;
             }
         }
 
         vmw_resource_unreference(&evict_res);
     } while (1);
 
     if (unlikely(ret != 0))
         goto out_no_validate;
     else if (!res->func->needs_backup && res->backup) {
         WARN_ON_ONCE(vmw_resource_mob_attached(res));
         vmw_bo_unreference(&res->backup);
     }
 
     return 0;
 
 out_no_validate:
     return ret;
 }
 
 
 /**
  * vmw_resource_unbind_list
  *
  * @vbo: Pointer to the current backing MOB.
  *
  * Evicts the Guest Backed hardware resource if the backup
  * buffer is being moved out of MOB memory.
  * Note that this function will not race with the resource
  * validation code, since resource validation and eviction
  * both require the backup buffer to be reserved.
  */
 void vmw_resource_unbind_list(struct vmw_buffer_object *vbo)
 {
     struct ttm_validate_buffer val_buf = {
         .bo = &vbo->base,
         .num_shared = 0
     };
 
     dma_resv_assert_held(vbo->base.base.resv);
     while (!RB_EMPTY_ROOT(&vbo->res_tree)) {
         struct rb_node *node = vbo->res_tree.rb_node;
         struct vmw_resource *res =
             container_of(node, struct vmw_resource, mob_node);
 
         if (!WARN_ON_ONCE(!res->func->unbind))
             (void) res->func->unbind(res, res->res_dirty, &val_buf);
 
         res->backup_dirty = true;
         res->res_dirty = false;
         vmw_resource_mob_detach(res);
     }
 
     (void) ttm_bo_wait(&vbo->base, false, false);
 }
 
 
 /**
  * vmw_query_readback_all - Read back cached query states
  *
  * @dx_query_mob: Buffer containing the DX query MOB
  *
  * Read back cached states from the device if they exist.  This function
  * assumings binding_mutex is held.
  */
 int vmw_query_readback_all(struct vmw_buffer_object *dx_query_mob)
 {
     struct vmw_resource *dx_query_ctx;
     struct vmw_private *dev_priv;
     struct {
         SVGA3dCmdHeader header;
         SVGA3dCmdDXReadbackAllQuery body;
     } *cmd;
 
 
     /* No query bound, so do nothing */
     if (!dx_query_mob || !dx_query_mob->dx_query_ctx)
         return 0;
 
     dx_query_ctx = dx_query_mob->dx_query_ctx;
     dev_priv     = dx_query_ctx->dev_priv;
 
     cmd = VMW_CMD_CTX_RESERVE(dev_priv, sizeof(*cmd), dx_query_ctx->id);
     if (unlikely(cmd == NULL))
         return -ENOMEM;
 
     cmd->header.id   = SVGA_3D_CMD_DX_READBACK_ALL_QUERY;
     cmd->header.size = sizeof(cmd->body);
     cmd->body.cid    = dx_query_ctx->id;
 
     vmw_cmd_commit(dev_priv, sizeof(*cmd));
 
     /* Triggers a rebind the next time affected context is bound */
     dx_query_mob->dx_query_ctx = NULL;
 
     return 0;
 }
 
 
 
 /**
  * vmw_query_move_notify - Read back cached query states
  *
  * @bo: The TTM buffer object about to move.
  * @old_mem: The memory region @bo is moving from.
  * @new_mem: The memory region @bo is moving to.
  *
  * Called before the query MOB is swapped out to read back cached query
  * states from the device.
  */
 void vmw_query_move_notify(struct ttm_buffer_object *bo,
                struct ttm_resource *old_mem,
                struct ttm_resource *new_mem)
 {
     struct vmw_buffer_object *dx_query_mob;
     struct ttm_device *bdev = bo->bdev;
     struct vmw_private *dev_priv;
 
     dev_priv = container_of(bdev, struct vmw_private, bdev);
 
     mutex_lock(&dev_priv->binding_mutex);
 
     /* If BO is being moved from MOB to system memory */
     if (new_mem->mem_type == TTM_PL_SYSTEM &&
         old_mem->mem_type == VMW_PL_MOB) {
         struct vmw_fence_obj *fence;
 
         dx_query_mob = container_of(bo, struct vmw_buffer_object, base);
         if (!dx_query_mob || !dx_query_mob->dx_query_ctx) {
             mutex_unlock(&dev_priv->binding_mutex);
             return;
         }
 
         (void) vmw_query_readback_all(dx_query_mob);
         mutex_unlock(&dev_priv->binding_mutex);
 
         /* Create a fence and attach the BO to it */
         (void) vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
         vmw_bo_fence_single(bo, fence);
 
         if (fence != NULL)
             vmw_fence_obj_unreference(&fence);
 
         (void) ttm_bo_wait(bo, false, false);
     } else
         mutex_unlock(&dev_priv->binding_mutex);
 }
 
 /**
  * vmw_resource_needs_backup - Return whether a resource needs a backup buffer.
  *
  * @res:            The resource being queried.
  */
 bool vmw_resource_needs_backup(const struct vmw_resource *res)
 {
     return res->func->needs_backup;
 }
 
 /**
  * vmw_resource_evict_type - Evict all resources of a specific type
  *
  * @dev_priv:       Pointer to a device private struct
  * @type:           The resource type to evict
  *
  * To avoid thrashing starvation or as part of the hibernation sequence,
  * try to evict all evictable resources of a specific type.
  */
 static void vmw_resource_evict_type(struct vmw_private *dev_priv,
                     enum vmw_res_type type)
 {
     struct list_head *lru_list = &dev_priv->res_lru[type];
     struct vmw_resource *evict_res;
     unsigned err_count = 0;
     int ret;
     struct ww_acquire_ctx ticket;
 
     do {
         spin_lock(&dev_priv->resource_lock);
 
         if (list_empty(lru_list))
             goto out_unlock;
 
         evict_res = vmw_resource_reference(
             list_first_entry(lru_list, struct vmw_resource,
                      lru_head));
         list_del_init(&evict_res->lru_head);
         spin_unlock(&dev_priv->resource_lock);
 
         /* Wait lock backup buffers with a ticket. */
         ret = vmw_resource_do_evict(&ticket, evict_res, false);
         if (unlikely(ret != 0)) {
             spin_lock(&dev_priv->resource_lock);
             list_add_tail(&evict_res->lru_head, lru_list);
             spin_unlock(&dev_priv->resource_lock);
             if (++err_count > VMW_RES_EVICT_ERR_COUNT) {
                 vmw_resource_unreference(&evict_res);
                 return;
             }
         }
 
         vmw_resource_unreference(&evict_res);
     } while (1);
 
 out_unlock:
     spin_unlock(&dev_priv->resource_lock);
 }
 
 /**
  * vmw_resource_evict_all - Evict all evictable resources
  *
  * @dev_priv:       Pointer to a device private struct
  *
  * To avoid thrashing starvation or as part of the hibernation sequence,
  * evict all evictable resources. In particular this means that all
  * guest-backed resources that are registered with the device are
  * evicted and the OTable becomes clean.
  */
 void vmw_resource_evict_all(struct vmw_private *dev_priv)
 {
     enum vmw_res_type type;
 
     mutex_lock(&dev_priv->cmdbuf_mutex);
 
     for (type = 0; type < vmw_res_max; ++type)
         vmw_resource_evict_type(dev_priv, type);
 
     mutex_unlock(&dev_priv->cmdbuf_mutex);
 }
 
 /*
  * vmw_resource_pin - Add a pin reference on a resource
  *
  * @res: The resource to add a pin reference on
  *
  * This function adds a pin reference, and if needed validates the resource.
  * Having a pin reference means that the resource can never be evicted, and
  * its id will never change as long as there is a pin reference.
  * This function returns 0 on success and a negative error code on failure.
  */
 int vmw_resource_pin(struct vmw_resource *res, bool interruptible)
 {
     struct ttm_operation_ctx ctx = { interruptible, false };
     struct vmw_private *dev_priv = res->dev_priv;
     int ret;
 
     mutex_lock(&dev_priv->cmdbuf_mutex);
     ret = vmw_resource_reserve(res, interruptible, false);
     if (ret)
         goto out_no_reserve;
 
     if (res->pin_count == 0) {
         struct vmw_buffer_object *vbo = NULL;
 
         if (res->backup) {
             vbo = res->backup;
 
             ret = ttm_bo_reserve(&vbo->base, interruptible, false, NULL);
             if (ret)
                 goto out_no_validate;
             if (!vbo->base.pin_count) {
                 ret = ttm_bo_validate
                     (&vbo->base,
                      res->func->backup_placement,
                      &ctx);
                 if (ret) {
                     ttm_bo_unreserve(&vbo->base);
                     goto out_no_validate;
                 }
             }
 
             /* Do we really need to pin the MOB as well? */
             vmw_bo_pin_reserved(vbo, true);
         }
         ret = vmw_resource_validate(res, interruptible, true);
         if (vbo)
             ttm_bo_unreserve(&vbo->base);
         if (ret)
             goto out_no_validate;
     }
     res->pin_count++;
 
 out_no_validate:
     vmw_resource_unreserve(res, false, false, false, NULL, 0UL);
 out_no_reserve:
     mutex_unlock(&dev_priv->cmdbuf_mutex);
 
     return ret;
 }
 
 /**
  * vmw_resource_unpin - Remove a pin reference from a resource
  *
  * @res: The resource to remove a pin reference from
  *
  * Having a pin reference means that the resource can never be evicted, and
  * its id will never change as long as there is a pin reference.
  */
 void vmw_resource_unpin(struct vmw_resource *res)
 {
     struct vmw_private *dev_priv = res->dev_priv;
     int ret;
 
     mutex_lock(&dev_priv->cmdbuf_mutex);
 
     ret = vmw_resource_reserve(res, false, true);
     WARN_ON(ret);
 
     WARN_ON(res->pin_count == 0);
     if (--res->pin_count == 0 && res->backup) {
         struct vmw_buffer_object *vbo = res->backup;
 
         (void) ttm_bo_reserve(&vbo->base, false, false, NULL);
         vmw_bo_pin_reserved(vbo, false);
         ttm_bo_unreserve(&vbo->base);
     }
 
     vmw_resource_unreserve(res, false, false, false, NULL, 0UL);
 
     mutex_unlock(&dev_priv->cmdbuf_mutex);
 }
 
 /**
  * vmw_res_type - Return the resource type
  *
  * @res: Pointer to the resource
  */
 enum vmw_res_type vmw_res_type(const struct vmw_resource *res)
 {
     return res->func->res_type;
 }
 
 /**
  * vmw_resource_dirty_update - Update a resource's dirty tracker with a
  * sequential range of touched backing store memory.
  * @res: The resource.
  * @start: The first page touched.
  * @end: The last page touched + 1.
  */
 void vmw_resource_dirty_update(struct vmw_resource *res, pgoff_t start,
                    pgoff_t end)
 {
     if (res->dirty)
         res->func->dirty_range_add(res, start << PAGE_SHIFT,
                        end << PAGE_SHIFT);
 }
 
 /**
  * vmw_resources_clean - Clean resources intersecting a mob range
  * @vbo: The mob buffer object
  * @start: The mob page offset starting the range
  * @end: The mob page offset ending the range
  * @num_prefault: Returns how many pages including the first have been
  * cleaned and are ok to prefault
  */
 int vmw_resources_clean(struct vmw_buffer_object *vbo, pgoff_t start,
             pgoff_t end, pgoff_t *num_prefault)
 {
     struct rb_node *cur = vbo->res_tree.rb_node;
     struct vmw_resource *found = NULL;
     unsigned long res_start = start << PAGE_SHIFT;
     unsigned long res_end = end << PAGE_SHIFT;
     unsigned long last_cleaned = 0;
 
     /*
      * Find the resource with lowest backup_offset that intersects the
      * range.
      */
     while (cur) {
         struct vmw_resource *cur_res =
             container_of(cur, struct vmw_resource, mob_node);
 
         if (cur_res->backup_offset >= res_end) {
             cur = cur->rb_left;
         } else if (cur_res->backup_offset + cur_res->backup_size <=
                res_start) {
             cur = cur->rb_right;
         } else {
             found = cur_res;
             cur = cur->rb_left;
             /* Continue to look for resources with lower offsets */
         }
     }
 
     /*
      * In order of increasing backup_offset, clean dirty resorces
      * intersecting the range.
      */
     while (found) {
         if (found->res_dirty) {
             int ret;
 
             if (!found->func->clean)
                 return -EINVAL;
 
             ret = found->func->clean(found);
             if (ret)
                 return ret;
 
             found->res_dirty = false;
         }
         last_cleaned = found->backup_offset + found->backup_size;
         cur = rb_next(&found->mob_node);
         if (!cur)
             break;
 
         found = container_of(cur, struct vmw_resource, mob_node);
         if (found->backup_offset >= res_end)
             break;
     }
 
     /*
      * Set number of pages allowed prefaulting and fence the buffer object
      */
     *num_prefault = 1;
     if (last_cleaned > res_start) {
         struct ttm_buffer_object *bo = &vbo->base;
 
         *num_prefault = __KERNEL_DIV_ROUND_UP(last_cleaned - res_start,
                               PAGE_SIZE);
         vmw_bo_fence_single(bo, NULL);
     }
 
     return 0;
 }

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