163 lines
4 KiB
C
163 lines
4 KiB
C
/*
|
|
* Copyright © 2016 Intel Corporation
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the next
|
|
* paragraph) shall be included in all copies or substantial portions of the
|
|
* Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
* IN THE SOFTWARE.
|
|
*
|
|
*/
|
|
|
|
#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);
|
|
}
|
|
|
|
if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir)) {
|
|
err = -ENOMEM;
|
|
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_sg(attachment->dev, st->sgl, st->nents, dir);
|
|
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 void *mock_dmabuf_vmap(struct dma_buf *dma_buf)
|
|
{
|
|
struct mock_dmabuf *mock = to_mock(dma_buf);
|
|
|
|
return vm_map_ram(mock->pages, mock->npages, 0, PAGE_KERNEL);
|
|
}
|
|
|
|
static void mock_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
|
|
{
|
|
struct mock_dmabuf *mock = to_mock(dma_buf);
|
|
|
|
vm_unmap_ram(vaddr, mock->npages);
|
|
}
|
|
|
|
static void *mock_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
|
|
{
|
|
struct mock_dmabuf *mock = to_mock(dma_buf);
|
|
|
|
return kmap(mock->pages[page_num]);
|
|
}
|
|
|
|
static void mock_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr)
|
|
{
|
|
struct mock_dmabuf *mock = to_mock(dma_buf);
|
|
|
|
return kunmap(mock->pages[page_num]);
|
|
}
|
|
|
|
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,
|
|
.map = mock_dmabuf_kmap,
|
|
.unmap = mock_dmabuf_kunmap,
|
|
.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);
|
|
}
|