/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* ION Memory Allocator - Internal header
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*
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* Copyright (C) 2019 Google, Inc.
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*/
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#ifndef _ION_PRIVATE_H
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#define _ION_PRIVATE_H
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#include <linux/dcache.h>
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#include <linux/dma-buf.h>
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#include <linux/ion.h>
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#include <linux/miscdevice.h>
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#include <linux/mutex.h>
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#include <linux/plist.h>
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#include <linux/rbtree.h>
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#include <linux/rwsem.h>
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#include <linux/types.h>
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/**
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* struct ion_device - the metadata of the ion device node
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* @dev: the actual misc device
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* @lock: rwsem protecting the tree of heaps, heap_bitmap and
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* clients
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* @heap_ids: bitmap of register heap ids
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*/
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struct ion_device {
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struct miscdevice dev;
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struct rw_semaphore lock;
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DECLARE_BITMAP(heap_ids, ION_NUM_MAX_HEAPS);
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struct plist_head heaps;
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struct dentry *debug_root;
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int heap_cnt;
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};
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/* ion_buffer manipulators */
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extern struct ion_buffer *ion_buffer_alloc(struct ion_device *dev, size_t len,
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unsigned int heap_id_mask,
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unsigned int flags);
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extern void ion_buffer_release(struct ion_buffer *buffer);
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extern int ion_buffer_destroy(struct ion_device *dev,
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struct ion_buffer *buffer);
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extern void *ion_buffer_kmap_get(struct ion_buffer *buffer);
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extern void ion_buffer_kmap_put(struct ion_buffer *buffer);
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/* ion dmabuf allocator */
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extern struct dma_buf *ion_dmabuf_alloc(struct ion_device *dev, size_t len,
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unsigned int heap_id_mask,
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unsigned int flags);
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extern int ion_free(struct ion_buffer *buffer);
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/* ion heap helpers */
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extern int ion_heap_cleanup(struct ion_heap *heap);
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u64 ion_get_total_heap_bytes(void);
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#endif /* _ION_PRIVATE_H */
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