163 lines
4 KiB
C
Executable file
163 lines
4 KiB
C
Executable file
/*
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* Copyright © 2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include "mock_dmabuf.h"
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static struct sg_table *mock_map_dma_buf(struct dma_buf_attachment *attachment,
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enum dma_data_direction dir)
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{
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struct mock_dmabuf *mock = to_mock(attachment->dmabuf);
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struct sg_table *st;
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struct scatterlist *sg;
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int i, err;
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st = kmalloc(sizeof(*st), GFP_KERNEL);
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if (!st)
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return ERR_PTR(-ENOMEM);
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err = sg_alloc_table(st, mock->npages, GFP_KERNEL);
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if (err)
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goto err_free;
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sg = st->sgl;
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for (i = 0; i < mock->npages; i++) {
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sg_set_page(sg, mock->pages[i], PAGE_SIZE, 0);
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sg = sg_next(sg);
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}
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if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) {
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err = -ENOMEM;
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goto err_st;
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}
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return st;
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err_st:
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sg_free_table(st);
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err_free:
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kfree(st);
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return ERR_PTR(err);
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}
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static void mock_unmap_dma_buf(struct dma_buf_attachment *attachment,
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struct sg_table *st,
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enum dma_data_direction dir)
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{
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dma_unmap_sg(attachment->dev, st->sgl, st->nents, dir);
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sg_free_table(st);
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kfree(st);
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}
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static void mock_dmabuf_release(struct dma_buf *dma_buf)
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{
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struct mock_dmabuf *mock = to_mock(dma_buf);
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int i;
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for (i = 0; i < mock->npages; i++)
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put_page(mock->pages[i]);
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kfree(mock);
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}
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static void *mock_dmabuf_vmap(struct dma_buf *dma_buf)
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{
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struct mock_dmabuf *mock = to_mock(dma_buf);
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return vm_map_ram(mock->pages, mock->npages, 0, PAGE_KERNEL);
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}
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static void mock_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
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{
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struct mock_dmabuf *mock = to_mock(dma_buf);
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vm_unmap_ram(vaddr, mock->npages);
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}
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static void *mock_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
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{
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struct mock_dmabuf *mock = to_mock(dma_buf);
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return kmap(mock->pages[page_num]);
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}
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static void mock_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
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{
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struct mock_dmabuf *mock = to_mock(dma_buf);
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return kunmap(mock->pages[page_num]);
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}
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static int mock_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
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{
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return -ENODEV;
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}
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static const struct dma_buf_ops mock_dmabuf_ops = {
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.map_dma_buf = mock_map_dma_buf,
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.unmap_dma_buf = mock_unmap_dma_buf,
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.release = mock_dmabuf_release,
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.map = mock_dmabuf_kmap,
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.unmap = mock_dmabuf_kunmap,
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.mmap = mock_dmabuf_mmap,
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.vmap = mock_dmabuf_vmap,
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.vunmap = mock_dmabuf_vunmap,
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};
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static struct dma_buf *mock_dmabuf(int npages)
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{
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struct mock_dmabuf *mock;
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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struct dma_buf *dmabuf;
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int i;
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mock = kmalloc(sizeof(*mock) + npages * sizeof(struct page *),
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GFP_KERNEL);
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if (!mock)
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return ERR_PTR(-ENOMEM);
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mock->npages = npages;
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for (i = 0; i < npages; i++) {
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mock->pages[i] = alloc_page(GFP_KERNEL);
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if (!mock->pages[i])
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goto err;
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}
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exp_info.ops = &mock_dmabuf_ops;
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exp_info.size = npages * PAGE_SIZE;
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exp_info.flags = O_CLOEXEC;
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exp_info.priv = mock;
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dmabuf = dma_buf_export(&exp_info);
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if (IS_ERR(dmabuf))
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goto err;
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return dmabuf;
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err:
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while (i--)
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put_page(mock->pages[i]);
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kfree(mock);
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return ERR_PTR(-ENOMEM);
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}
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