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53 lines
1.4 KiB
53 lines
1.4 KiB
/* 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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