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dma-buf: Add dma-buf heaps framework

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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 <labbott@redhat.com>
Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Liam Mark <lmark@codeaurora.org>
Cc: Pratik Patel <pratikp@codeaurora.org>
Cc: Brian Starkey <Brian.Starkey@arm.com>
Cc: Vincent Donnefort <Vincent.Donnefort@arm.com>
Cc: Sudipto Paul <Sudipto.Paul@arm.com>
Cc: Andrew F. Davis <afd@ti.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Chenbo Feng <fengc@google.com>
Cc: Alistair Strachan <astrachan@google.com>
Cc: Hridya Valsaraju <hridya@google.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: dri-devel@lists.freedesktop.org
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Brian Starkey <brian.starkey@arm.com>
Acked-by: Laura Abbott <labbott@redhat.com>
Tested-by: Ayan Kumar Halder <ayan.halder@arm.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191021190310.85221-2-john.stultz@linaro.org
This commit is contained in:
Andrew F. Davis 2019-10-21 19:03:06 +00:00 • committed by Sumit Semwal
parent ea7d8c675e
commit a69b0e855d
6 changed files with 411 additions and 0 deletions
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59
include/linux/dma-heap.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* DMABUF Heaps Allocation Infrastructure
*
* Copyright (C) 2011 Google, Inc.
* Copyright (C) 2019 Linaro Ltd.
*/
#ifndef _DMA_HEAPS_H
#define _DMA_HEAPS_H
#include <linux/cdev.h>
#include <linux/types.h>
struct dma_heap;
/**
* struct dma_heap_ops - ops to operate on a given heap
* @allocate: allocate dmabuf and return fd
*
* allocate returns dmabuf fd on success, -errno on error.
*/
struct dma_heap_ops {
int (*allocate)(struct dma_heap *heap,
unsigned long len,
unsigned long fd_flags,
unsigned long heap_flags);
};
/**
* struct dma_heap_export_info - information needed to export a new dmabuf heap
* @name: used for debugging/device-node name
* @ops: ops struct for this heap
* @priv: heap exporter private data
*
* Information needed to export a new dmabuf heap.
*/
struct dma_heap_export_info {
const char *name;
const struct dma_heap_ops *ops;
void *priv;
};
/**
* dma_heap_get_drvdata() - get per-heap driver data
* @heap: DMA-Heap to retrieve private data for
*
* Returns:
* The per-heap data for the heap.
*/
void *dma_heap_get_drvdata(struct dma_heap *heap);
/**
* dma_heap_add - adds a heap to dmabuf heaps
* @exp_info: information needed to register this heap
*/
struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info);
#endif /* _DMA_HEAPS_H */