1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
// SPDX-License-Identifier: GPL-2.0
/*
* Dummy DMA ops that always fail.
*/
#include <linux/dma-map-ops.h>
static int dma_dummy_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
return -ENXIO;
}
static dma_addr_t dma_dummy_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
return DMA_MAPPING_ERROR;
}
static void dma_dummy_unmap_page(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir, unsigned long attrs)
{
/*
* Dummy ops doesn't support map_page, so unmap_page should never be
* called.
*/
WARN_ON_ONCE(true);
}
static int dma_dummy_map_sg(struct device *dev, struct scatterlist *sgl,
int nelems, enum dma_data_direction dir,
unsigned long attrs)
{
return -EINVAL;
}
static void dma_dummy_unmap_sg(struct device *dev, struct scatterlist *sgl,
int nelems, enum dma_data_direction dir,
unsigned long attrs)
{
/*
* Dummy ops doesn't support map_sg, so unmap_sg should never be called.
*/
WARN_ON_ONCE(true);
}
static int dma_dummy_supported(struct device *hwdev, u64 mask)
{
return 0;
}
const struct dma_map_ops dma_dummy_ops = {
.mmap = dma_dummy_mmap,
.map_page = dma_dummy_map_page,
.unmap_page = dma_dummy_unmap_page,
.map_sg = dma_dummy_map_sg,
.unmap_sg = dma_dummy_unmap_sg,
.dma_supported = dma_dummy_supported,
};
|
