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 if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) {
45 static void mock_unmap_dma_buf(struct dma_buf_attachment *attachment,
47 enum dma_data_direction dir)
49 dma_unmap_sg(attachment->dev, st->sgl, st->nents, dir);
54 static void mock_dmabuf_release(struct dma_buf *dma_buf)
56 struct mock_dmabuf *mock = to_mock(dma_buf);
59 for (i = 0; i < mock->npages; i++)
60 put_page(mock->pages[i]);
65 static void *mock_dmabuf_vmap(struct dma_buf *dma_buf)
67 struct mock_dmabuf *mock = to_mock(dma_buf);
69 return vm_map_ram(mock->pages, mock->npages, 0);
72 static void mock_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
74 struct mock_dmabuf *mock = to_mock(dma_buf);
76 vm_unmap_ram(vaddr, mock->npages);
79 static int mock_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
84 static const struct dma_buf_ops mock_dmabuf_ops = {
85 .map_dma_buf = mock_map_dma_buf,
86 .unmap_dma_buf = mock_unmap_dma_buf,
87 .release = mock_dmabuf_release,
88 .mmap = mock_dmabuf_mmap,
89 .vmap = mock_dmabuf_vmap,
90 .vunmap = mock_dmabuf_vunmap,
93 static struct dma_buf *mock_dmabuf(int npages)
95 struct mock_dmabuf *mock;
96 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
97 struct dma_buf *dmabuf;
100 mock = kmalloc(sizeof(*mock) + npages * sizeof(struct page *),
103 return ERR_PTR(-ENOMEM);
105 mock->npages = npages;
106 for (i = 0; i < npages; i++) {
107 mock->pages[i] = alloc_page(GFP_KERNEL);
112 exp_info.ops = &mock_dmabuf_ops;
113 exp_info.size = npages * PAGE_SIZE;
114 exp_info.flags = O_CLOEXEC;
115 exp_info.priv = mock;
117 dmabuf = dma_buf_export(&exp_info);
125 put_page(mock->pages[i]);
127 return ERR_PTR(-ENOMEM);