diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c')
-rw-r--r-- | drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c b/drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c new file mode 100644 index 0000000000..b2a5882b8f --- /dev/null +++ b/drivers/gpu/drm/i915/gem/selftests/mock_dmabuf.c @@ -0,0 +1,133 @@ +/* + * SPDX-License-Identifier: MIT + * + * Copyright © 2016 Intel Corporation + */ + +#include "mock_dmabuf.h" + +static struct sg_table *mock_map_dma_buf(struct dma_buf_attachment *attachment, + enum dma_data_direction dir) +{ + struct mock_dmabuf *mock = to_mock(attachment->dmabuf); + struct sg_table *st; + struct scatterlist *sg; + int i, err; + + st = kmalloc(sizeof(*st), GFP_KERNEL); + if (!st) + return ERR_PTR(-ENOMEM); + + err = sg_alloc_table(st, mock->npages, GFP_KERNEL); + if (err) + goto err_free; + + sg = st->sgl; + for (i = 0; i < mock->npages; i++) { + sg_set_page(sg, mock->pages[i], PAGE_SIZE, 0); + sg = sg_next(sg); + } + + err = dma_map_sgtable(attachment->dev, st, dir, 0); + if (err) + goto err_st; + + return st; + +err_st: + sg_free_table(st); +err_free: + kfree(st); + return ERR_PTR(err); +} + +static void mock_unmap_dma_buf(struct dma_buf_attachment *attachment, + struct sg_table *st, + enum dma_data_direction dir) +{ + dma_unmap_sgtable(attachment->dev, st, dir, 0); + sg_free_table(st); + kfree(st); +} + +static void mock_dmabuf_release(struct dma_buf *dma_buf) +{ + struct mock_dmabuf *mock = to_mock(dma_buf); + int i; + + for (i = 0; i < mock->npages; i++) + put_page(mock->pages[i]); + + kfree(mock); +} + +static int mock_dmabuf_vmap(struct dma_buf *dma_buf, struct iosys_map *map) +{ + struct mock_dmabuf *mock = to_mock(dma_buf); + void *vaddr; + + vaddr = vm_map_ram(mock->pages, mock->npages, 0); + if (!vaddr) + return -ENOMEM; + iosys_map_set_vaddr(map, vaddr); + + return 0; +} + +static void mock_dmabuf_vunmap(struct dma_buf *dma_buf, struct iosys_map *map) +{ + struct mock_dmabuf *mock = to_mock(dma_buf); + + vm_unmap_ram(map->vaddr, mock->npages); +} + +static int mock_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) +{ + return -ENODEV; +} + +static const struct dma_buf_ops mock_dmabuf_ops = { + .map_dma_buf = mock_map_dma_buf, + .unmap_dma_buf = mock_unmap_dma_buf, + .release = mock_dmabuf_release, + .mmap = mock_dmabuf_mmap, + .vmap = mock_dmabuf_vmap, + .vunmap = mock_dmabuf_vunmap, +}; + +static struct dma_buf *mock_dmabuf(int npages) +{ + struct mock_dmabuf *mock; + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + struct dma_buf *dmabuf; + int i; + + mock = kmalloc(sizeof(*mock) + npages * sizeof(struct page *), + GFP_KERNEL); + if (!mock) + return ERR_PTR(-ENOMEM); + + mock->npages = npages; + for (i = 0; i < npages; i++) { + mock->pages[i] = alloc_page(GFP_KERNEL); + if (!mock->pages[i]) + goto err; + } + + exp_info.ops = &mock_dmabuf_ops; + exp_info.size = npages * PAGE_SIZE; + exp_info.flags = O_CLOEXEC; + exp_info.priv = mock; + + dmabuf = dma_buf_export(&exp_info); + if (IS_ERR(dmabuf)) + goto err; + + return dmabuf; + +err: + while (i--) + put_page(mock->pages[i]); + kfree(mock); + return ERR_PTR(-ENOMEM); +} |