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
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* DMABUF Heaps Userspace API
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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 _UAPI_LINUX_DMABUF_POOL_H
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#define _UAPI_LINUX_DMABUF_POOL_H
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#include <linux/ioctl.h>
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#include <linux/types.h>
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/**
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* DOC: DMABUF Heaps Userspace API
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*/
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/* Valid FD_FLAGS are O_CLOEXEC, O_RDONLY, O_WRONLY, O_RDWR */
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#define DMA_HEAP_VALID_FD_FLAGS (O_CLOEXEC | O_ACCMODE)
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/* Currently no heap flags */
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#define DMA_HEAP_VALID_HEAP_FLAGS (0)
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/**
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* struct dma_heap_allocation_data - metadata passed from userspace for
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* allocations
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* @len: size of the allocation
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* @fd: will be populated with a fd which provides the
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* handle to the allocated dma-buf
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* @fd_flags: file descriptor flags used when allocating
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* @heap_flags: flags passed to heap
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*
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* Provided by userspace as an argument to the ioctl
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*/
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struct dma_heap_allocation_data {
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__u64 len;
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__u32 fd;
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__u32 fd_flags;
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__u64 heap_flags;
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};
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#define DMA_HEAP_IOC_MAGIC 'H'
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/**
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* DOC: DMA_HEAP_IOC_ALLOC - allocate memory from pool
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*
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* Takes a dma_heap_allocation_data struct and returns it with the fd field
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* populated with the dmabuf handle of the allocation.
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*/
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#define DMA_HEAP_IOC_ALLOC _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,\
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struct dma_heap_allocation_data)
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#endif /* _UAPI_LINUX_DMABUF_POOL_H */
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