89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
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/*
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* dma_buf exporter for nvmap
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*
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* Copyright (c) 2012-2018, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#define pr_fmt(fmt) "nvmap: %s() " fmt, __func__
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/nvmap.h>
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#include <linux/dma-buf.h>
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#include <linux/version.h>
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#include <trace/events/nvmap.h>
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#include "nvmap_dmabuf.h"
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extern bool dmabuf_is_nvmap(struct dma_buf *dmabuf);
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extern struct dma_buf_ops nvmap_dma_buf_ops;
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int nvmap_dmabuf_is_nvmap(struct dma_buf *dmabuf)
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{
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return dmabuf_is_nvmap(dmabuf);
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}
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struct dma_buf *nvmap_dmabuf_from_fd(int fd)
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{
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struct dma_buf *dmabuf;
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dmabuf = dma_buf_get(fd);
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if (IS_ERR(dmabuf))
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return dmabuf;
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dma_buf_put(dmabuf);
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return dmabuf;
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}
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struct nvmap_handle * nvmap_dmabuf_to_handle(struct dma_buf *dmabuf)
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{
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struct nvmap_handle_info *info;
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if (!dmabuf_is_nvmap(dmabuf)) {
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return ERR_PTR(-EINVAL);
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}
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info = dmabuf->priv;
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return info->handle;
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}
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void nvmap_dmabuf_install_fd(struct dma_buf *dmabuf, int fd)
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{
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fd_install(fd, dmabuf->file);
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}
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 0)
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static struct dma_buf *__dma_buf_export(void * priv,
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size_t size)
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{
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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exp_info.priv = priv;
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exp_info.ops = &nvmap_dma_buf_ops;
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exp_info.size = size;
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exp_info.flags = O_RDWR;
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exp_info.exp_flags = DMABUF_CAN_DEFER_UNMAP |
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DMABUF_SKIP_CACHE_SYNC;
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return dma_buf_export(&exp_info);
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}
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#else
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#define __dma_buf_export(priv, size) \
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dma_buf_export(priv, &nvmap_dma_buf_ops, size, O_RDWR, NULL)
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#endif
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/*
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* Make a dmabuf object for an nvmap handle.
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*/
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struct dma_buf *nvmap_dmabuf_create(void * priv, size_t size)
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{
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return __dma_buf_export(priv, size);
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}
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