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/**
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/**
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 * struct ttm_validate_buffer
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 * struct ttm_validate_buffer
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 *
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 *
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 * @head:           list head for thread-private list.
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 * @head:           list head for thread-private list.
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 * @bo:             refcounted buffer object pointer.
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 * @bo:             refcounted buffer object pointer.
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 * @reserved:       Indicates whether @bo has been reserved for validation.
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 * @shared:         should the fence be added shared?
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 * @removed:        Indicates whether @bo has been removed from lru lists.
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 * @put_count:      Number of outstanding references on bo::list_kref.
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 * @old_sync_obj:   Pointer to a sync object about to be unreferenced
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 */
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 */
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struct ttm_validate_buffer {
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struct ttm_validate_buffer {
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	struct list_head head;
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	struct list_head head;
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	struct ttm_buffer_object *bo;
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	struct ttm_buffer_object *bo;
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	bool reserved;
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	bool removed;
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	int put_count;
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	void *old_sync_obj;
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	bool shared;
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};
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};
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/**
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/**
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 * function ttm_eu_reserve_buffers
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 * function ttm_eu_reserve_buffers
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 *
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 *
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 * @ticket:  [out] ww_acquire_ctx filled in by call, or NULL if only
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 * @ticket:  [out] ww_acquire_ctx filled in by call, or NULL if only
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 *           non-blocking reserves should be tried.
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 *           non-blocking reserves should be tried.
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 * @list:    thread private list of ttm_validate_buffer structs.
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 * @list:    thread private list of ttm_validate_buffer structs.
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 * @intr:    should the wait be interruptible
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 * @dups:    [out] optional list of duplicates.
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 *
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 *
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 * Tries to reserve bos pointed to by the list entries for validation.
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 * Tries to reserve bos pointed to by the list entries for validation.
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 * If the function returns 0, all buffers are marked as "unfenced",
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 * If the function returns 0, all buffers are marked as "unfenced",
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 * taken off the lru lists and are not synced for write CPU usage.
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 * taken off the lru lists and are not synced for write CPU usage.
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 *
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 *
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 * reserve the same buffers in reverse order, all threads except one will
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 * reserve the same buffers in reverse order, all threads except one will
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 * back off and retry. This function may sleep while waiting for
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 * back off and retry. This function may sleep while waiting for
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 * CPU write reservations to be cleared, and for other threads to
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 * CPU write reservations to be cleared, and for other threads to
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 * unreserve their buffers.
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 * unreserve their buffers.
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 *
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 *
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 * This function may return -ERESTART or -EAGAIN if the calling process
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 * If intr is set to true, this function may return -ERESTARTSYS if the
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 * receives a signal while waiting. In that case, no buffers on the list
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 * calling process receives a signal while waiting. In that case, no
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 * will be reserved upon return.
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 * buffers on the list will be reserved upon return.
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 *
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 * If dups is non NULL all buffers already reserved by the current thread
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 * (e.g. duplicates) are added to this list, otherwise -EALREADY is returned
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 * on the first already reserved buffer and all buffers from the list are
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 * unreserved again.
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 *
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 *
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 * Buffers reserved by this function should be unreserved by
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 * Buffers reserved by this function should be unreserved by
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 * a call to either ttm_eu_backoff_reservation() or
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 * a call to either ttm_eu_backoff_reservation() or
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 * ttm_eu_fence_buffer_objects() when command submission is complete or
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 * ttm_eu_fence_buffer_objects() when command submission is complete or
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 * has failed.
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 * has failed.
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 */
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 */
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extern int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
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extern int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
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				  struct list_head *list, bool intr,
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				  struct list_head *list);
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				  struct list_head *dups);
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/**
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/**
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 * function ttm_eu_fence_buffer_objects.
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 * function ttm_eu_fence_buffer_objects.
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 *
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 *
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 * @ticket:      ww_acquire_ctx from reserve call
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 * @ticket:      ww_acquire_ctx from reserve call
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 * @list:        thread private list of ttm_validate_buffer structs.
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 * @list:        thread private list of ttm_validate_buffer structs.
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 * @sync_obj:    The new sync object for the buffers.
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 * @fence:       The new exclusive fence for the buffers.
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 *
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 *
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 * This function should be called when command submission is complete, and
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 * This function should be called when command submission is complete, and
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 * it will add a new sync object to bos pointed to by entries on @list.
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 * it will add a new sync object to bos pointed to by entries on @list.
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 * It also unreserves all buffers, putting them on lru lists.
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 * It also unreserves all buffers, putting them on lru lists.
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 *
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 *
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 */
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 */
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extern void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,