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54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* DMABUF Heaps helper code
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*
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* Copyright (C) 2011 Google, Inc.
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* Copyright (C) 2019 Linaro Ltd.
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*/
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#ifndef _HEAP_HELPERS_H
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#define _HEAP_HELPERS_H
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#include <linux/dma-heap.h>
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#include <linux/list.h>
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/**
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* struct heap_helper_buffer - helper buffer metadata
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* @heap: back pointer to the heap the buffer came from
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* @dmabuf: backing dma-buf for this buffer
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* @size: size of the buffer
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* @priv_virt pointer to heap specific private value
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* @lock mutext to protect the data in this structure
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* @vmap_cnt count of vmap references on the buffer
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* @vaddr vmap'ed virtual address
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* @pagecount number of pages in the buffer
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* @pages list of page pointers
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* @attachments list of device attachments
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*
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* @free heap callback to free the buffer
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*/
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struct heap_helper_buffer {
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struct dma_heap *heap;
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struct dma_buf *dmabuf;
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size_t size;
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void *priv_virt;
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struct mutex lock;
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int vmap_cnt;
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void *vaddr;
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pgoff_t pagecount;
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struct page **pages;
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struct list_head attachments;
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void (*free)(struct heap_helper_buffer *buffer);
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};
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void init_heap_helper_buffer(struct heap_helper_buffer *buffer,
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void (*free)(struct heap_helper_buffer *));
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struct dma_buf *heap_helper_export_dmabuf(struct heap_helper_buffer *buffer,
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int fd_flags);
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extern const struct dma_buf_ops heap_helper_ops;
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#endif /* _HEAP_HELPERS_H */
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