d4efd79a81
This is always PAGE_KERNEL - for long term mappings with other properties vmap should be used. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Christophe Leroy <christophe.leroy@c-s.fr> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: David Airlie <airlied@linux.ie> Cc: Gao Xiang <xiang@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Kelley <mikelley@microsoft.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Nitin Gupta <ngupta@vflare.org> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Sakari Ailus <sakari.ailus@linux.intel.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Wei Liu <wei.liu@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mackerras <paulus@ozlabs.org> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Link: http://lkml.kernel.org/r/20200414131348.444715-19-hch@lst.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
128 lines
2.6 KiB
C
128 lines
2.6 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2016 Intel Corporation
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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);
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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 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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.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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