72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*
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* drivers/video/tegra/dc/ext/util.c
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*
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* Copyright (c) 2011-2013, NVIDIA CORPORATION, All rights reserved.
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*
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* Author: Robert Morell <rmorell@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that 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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#include <linux/err.h>
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#include <linux/types.h>
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#include <linux/dma-buf.h>
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#include <linux/nvmap.h>
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#include <linux/slab.h>
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#include "tegra_dc_ext_priv.h"
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int tegra_dc_ext_pin_window(struct tegra_dc_ext_user *user, u32 id,
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struct tegra_dc_dmabuf **dc_buf,
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dma_addr_t *phys_addr)
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{
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struct tegra_dc_ext *ext = user->ext;
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struct tegra_dc_dmabuf *dc_dmabuf;
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*dc_buf = NULL;
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*phys_addr = -1;
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if (!id)
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return 0;
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dc_dmabuf = kzalloc(sizeof(*dc_dmabuf), GFP_KERNEL);
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if (!dc_dmabuf)
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return -ENOMEM;
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/*
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* Take a reference to the buffer using the user's nvmap context, to
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* make sure they have permissions to access it.
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*/
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dc_dmabuf->buf = nvmap_dmabuf_export(user->nvmap, id);
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if (IS_ERR_OR_NULL(dc_dmabuf->buf))
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goto buf_fail;
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dc_dmabuf->attach = dma_buf_attach(dc_dmabuf->buf, ext->dev->parent);
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if (IS_ERR_OR_NULL(dc_dmabuf->attach))
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goto attach_fail;
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dc_dmabuf->sgt = dma_buf_map_attachment(dc_dmabuf->attach,
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DMA_TO_DEVICE);
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if (IS_ERR_OR_NULL(dc_dmabuf->sgt))
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goto sgt_fail;
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*phys_addr = sg_dma_address(dc_dmabuf->sgt->sgl);
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*dc_buf = dc_dmabuf;
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return 0;
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sgt_fail:
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dma_buf_detach(dc_dmabuf->buf, dc_dmabuf->attach);
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attach_fail:
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dma_buf_put(dc_dmabuf->buf);
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buf_fail:
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kfree(dc_dmabuf);
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return -ENOMEM;
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}
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