mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-01 14:53:11 +01:00
Andrew F. Davis
c02a81fba7
This framework allows a unified userspace interface for dma-buf exporters, allowing userland to allocate specific types of memory for use in dma-buf sharing. Each heap is given its own device node, which a user can allocate a dma-buf fd from using the DMA_HEAP_IOC_ALLOC. This code is an evoluiton of the Android ION implementation, and a big thanks is due to its authors/maintainers over time for their effort: Rebecca Schultz Zavin, Colin Cross, Benjamin Gaignard, Laura Abbott, and many other contributors! Cc: Laura Abbott <[email protected]> Cc: Benjamin Gaignard <[email protected]> Cc: Sumit Semwal <[email protected]> Cc: Liam Mark <[email protected]> Cc: Pratik Patel <[email protected]> Cc: Brian Starkey <[email protected]> Cc: Vincent Donnefort <[email protected]> Cc: Sudipto Paul <[email protected]> Cc: Andrew F. Davis <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Chenbo Feng <[email protected]> Cc: Alistair Strachan <[email protected]> Cc: Hridya Valsaraju <[email protected]> Cc: Sandeep Patil <[email protected]> Cc: Hillf Danton <[email protected]> Cc: Dave Airlie <[email protected]> Cc: [email protected] Reviewed-by: Brian Starkey <[email protected]> Acked-by: Sandeep Patil <[email protected]> Signed-off-by: Andrew F. Davis <[email protected]> Signed-off-by: John Stultz <[email protected]> Signed-off-by: Sumit Semwal <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* DMABUF Heaps Allocation Infrastructure
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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 _DMA_HEAPS_H
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#define _DMA_HEAPS_H
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#include <linux/cdev.h>
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#include <linux/types.h>
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struct dma_heap;
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/**
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* struct dma_heap_ops - ops to operate on a given heap
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* @allocate: allocate dmabuf and return fd
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*
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* allocate returns dmabuf fd on success, -errno on error.
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*/
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struct dma_heap_ops {
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int (*allocate)(struct dma_heap *heap,
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unsigned long len,
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unsigned long fd_flags,
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unsigned long heap_flags);
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};
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/**
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* struct dma_heap_export_info - information needed to export a new dmabuf heap
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* @name: used for debugging/device-node name
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* @ops: ops struct for this heap
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* @priv: heap exporter private data
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*
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* Information needed to export a new dmabuf heap.
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*/
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struct dma_heap_export_info {
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const char *name;
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const struct dma_heap_ops *ops;
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void *priv;
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};
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/**
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* dma_heap_get_drvdata() - get per-heap driver data
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* @heap: DMA-Heap to retrieve private data for
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*
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* Returns:
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* The per-heap data for the heap.
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*/
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void *dma_heap_get_drvdata(struct dma_heap *heap);
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/**
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* dma_heap_add - adds a heap to dmabuf heaps
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* @exp_info: information needed to register this heap
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*/
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struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info);
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#endif /* _DMA_HEAPS_H */
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