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void drm_vma_offset_manager_init(struct drm_vma_offset_manager *mgr,
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void drm_vma_offset_manager_init(struct drm_vma_offset_manager *mgr,
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				 unsigned long page_offset, unsigned long size);
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				 unsigned long page_offset, unsigned long size);
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void drm_vma_offset_manager_destroy(struct drm_vma_offset_manager *mgr);
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struct drm_vma_offset_node *drm_vma_offset_lookup(struct drm_vma_offset_manager *mgr,
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						  unsigned long start,
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void drm_vma_offset_manager_destroy(struct drm_vma_offset_manager *mgr);
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						  unsigned long pages);
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struct drm_vma_offset_node *drm_vma_offset_lookup_locked(struct drm_vma_offset_manager *mgr,
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struct drm_vma_offset_node *drm_vma_offset_lookup_locked(struct drm_vma_offset_manager *mgr,
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							   unsigned long start,
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							   unsigned long start,
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							   unsigned long pages);
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							   unsigned long pages);
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void drm_vma_node_revoke(struct drm_vma_offset_node *node, struct file *filp);
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void drm_vma_node_revoke(struct drm_vma_offset_node *node, struct file *filp);
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bool drm_vma_node_is_allowed(struct drm_vma_offset_node *node,
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bool drm_vma_node_is_allowed(struct drm_vma_offset_node *node,
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			     struct file *filp);
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			     struct file *filp);
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/**
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/**
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 * drm_vma_offset_exact_lookup() - Look up node by exact address
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 * drm_vma_offset_exact_lookup_locked() - Look up node by exact address
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 * @mgr: Manager object
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 * @mgr: Manager object
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 * @start: Start address (page-based, not byte-based)
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 * @start: Start address (page-based, not byte-based)
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 * @pages: Size of object (page-based)
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 * @pages: Size of object (page-based)
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 *
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 *
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 * Same as drm_vma_offset_lookup() but does not allow any offset into the node.
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 * Same as drm_vma_offset_lookup_locked() but does not allow any offset into the node.
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 * It only returns the exact object with the given start address.
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 * It only returns the exact object with the given start address.
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 *
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 *
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 * RETURNS:
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 * RETURNS:
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 * Node at exact start address @start.
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 * Node at exact start address @start.
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 */
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 */
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static inline struct drm_vma_offset_node *
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static inline struct drm_vma_offset_node *
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drm_vma_offset_exact_lookup(struct drm_vma_offset_manager *mgr,
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drm_vma_offset_exact_lookup_locked(struct drm_vma_offset_manager *mgr,
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			    unsigned long start,
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				   unsigned long start,
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			    unsigned long pages)
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				   unsigned long pages)
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{
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{
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	struct drm_vma_offset_node *node;
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	struct drm_vma_offset_node *node;
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	node = drm_vma_offset_lookup(mgr, start, pages);
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	node = drm_vma_offset_lookup_locked(mgr, start, pages);
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	return (node && node->vm_node.start == start) ? node : NULL;
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	return (node && node->vm_node.start == start) ? node : NULL;
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}
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}
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/**
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/**
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 * drm_vma_offset_lock_lookup() - Lock lookup for extended private use
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 * drm_vma_offset_lock_lookup() - Lock lookup for extended private use
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 * @mgr: Manager object
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 * @mgr: Manager object
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 *
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 *
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 * Lock VMA manager for extended lookups. Only *_locked() VMA function calls
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 * Lock VMA manager for extended lookups. Only locked VMA function calls
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 * are allowed while holding this lock. All other contexts are blocked from VMA
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 * are allowed while holding this lock. All other contexts are blocked from VMA
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 * until the lock is released via drm_vma_offset_unlock_lookup().
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 * until the lock is released via drm_vma_offset_unlock_lookup().
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 *
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 *
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 * Use this if you need to take a reference to the objects returned by
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 * Use this if you need to take a reference to the objects returned by
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 * drm_vma_offset_lookup_locked() before releasing this lock again.
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 * drm_vma_offset_lookup_locked() before releasing this lock again.
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 *
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 *
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 * This lock must not be used for anything else than extended lookups. You must
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 * This lock must not be used for anything else than extended lookups. You must
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 * not call any other VMA helpers while holding this lock.
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 *
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 * Note: You're in atomic-context while holding this lock!
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 *
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 * Example:
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 *   drm_vma_offset_lock_lookup(mgr);
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 *   node = drm_vma_offset_lookup_locked(mgr);
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 *   if (node)
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 * not call any other VMA helpers while holding this lock.
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 *       kref_get_unless_zero(container_of(node, sth, entr));
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 *
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 *   drm_vma_offset_unlock_lookup(mgr);
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 * Note: You're in atomic-context while holding this lock!
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 */
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 */
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static inline void drm_vma_offset_lock_lookup(struct drm_vma_offset_manager *mgr)
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static inline void drm_vma_offset_lock_lookup(struct drm_vma_offset_manager *mgr)