2 * SPDX-License-Identifier: MIT
4 * Copyright © 2016 Intel Corporation
7 #include "mock_dmabuf.h"
9 static struct sg_table *mock_map_dma_buf(struct dma_buf_attachment *attachment,
10 enum dma_data_direction dir)
12 struct mock_dmabuf *mock = to_mock(attachment->dmabuf);
14 struct scatterlist *sg;
17 st = kmalloc(sizeof(*st), GFP_KERNEL);
19 return ERR_PTR(-ENOMEM);
21 err = sg_alloc_table(st, mock->npages, GFP_KERNEL);
26 for (i = 0; i < mock->npages; i++) {
27 sg_set_page(sg, mock->pages[i], PAGE_SIZE, 0);
31 err = dma_map_sgtable(attachment->dev, st, dir, 0);
44 static void mock_unmap_dma_buf(struct dma_buf_attachment *attachment,
46 enum dma_data_direction dir)
48 dma_unmap_sgtable(attachment->dev, st, dir, 0);
53 static void mock_dmabuf_release(struct dma_buf *dma_buf)
55 struct mock_dmabuf *mock = to_mock(dma_buf);
58 for (i = 0; i < mock->npages; i++)
59 put_page(mock->pages[i]);
64 static void *mock_dmabuf_vmap(struct dma_buf *dma_buf)
66 struct mock_dmabuf *mock = to_mock(dma_buf);
68 return vm_map_ram(mock->pages, mock->npages, 0);
71 static void mock_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
73 struct mock_dmabuf *mock = to_mock(dma_buf);
75 vm_unmap_ram(vaddr, mock->npages);
78 static int mock_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
83 static const struct dma_buf_ops mock_dmabuf_ops = {
84 .map_dma_buf = mock_map_dma_buf,
85 .unmap_dma_buf = mock_unmap_dma_buf,
86 .release = mock_dmabuf_release,
87 .mmap = mock_dmabuf_mmap,
88 .vmap = mock_dmabuf_vmap,
89 .vunmap = mock_dmabuf_vunmap,
92 static struct dma_buf *mock_dmabuf(int npages)
94 struct mock_dmabuf *mock;
95 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
96 struct dma_buf *dmabuf;
99 mock = kmalloc(sizeof(*mock) + npages * sizeof(struct page *),
102 return ERR_PTR(-ENOMEM);
104 mock->npages = npages;
105 for (i = 0; i < npages; i++) {
106 mock->pages[i] = alloc_page(GFP_KERNEL);
111 exp_info.ops = &mock_dmabuf_ops;
112 exp_info.size = npages * PAGE_SIZE;
113 exp_info.flags = O_CLOEXEC;
114 exp_info.priv = mock;
116 dmabuf = dma_buf_export(&exp_info);
124 put_page(mock->pages[i]);
126 return ERR_PTR(-ENOMEM);