mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 05:36:35 +07:00
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 <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: Sandeep Patil <sspatil@google.com> Cc: Hillf Danton <hdanton@sina.com> Cc: Dave Airlie <airlied@gmail.com> Cc: dri-devel@lists.freedesktop.org Reviewed-by: Brian Starkey <brian.starkey@arm.com> Acked-by: Sandeep Patil <sspatil@android.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/20191203172641.66642-2-john.stultz@linaro.org
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/* 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 */
|