Contributors: 19
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Christoph Hellwig |
317 |
65.77% |
15 |
39.47% |
| Roman Skakun |
43 |
8.92% |
1 |
2.63% |
| FUJITA Tomonori |
37 |
7.68% |
3 |
7.89% |
| David Brownell |
24 |
4.98% |
1 |
2.63% |
| Marek Szyprowski |
13 |
2.70% |
2 |
5.26% |
| Niklas Söderlund |
8 |
1.66% |
1 |
2.63% |
| Russell King |
8 |
1.66% |
1 |
2.63% |
| Tejun Heo |
7 |
1.45% |
1 |
2.63% |
| Linus Torvalds (pre-git) |
6 |
1.24% |
2 |
5.26% |
| Max Filippov |
4 |
0.83% |
1 |
2.63% |
| Bart Van Assche |
4 |
0.83% |
2 |
5.26% |
| Nicolin Chen |
2 |
0.41% |
1 |
2.63% |
| David Rientjes |
2 |
0.41% |
1 |
2.63% |
| Andi Kleen |
2 |
0.41% |
1 |
2.63% |
| Christian Bornträger |
1 |
0.21% |
1 |
2.63% |
| Anton Blanchard |
1 |
0.21% |
1 |
2.63% |
| Mark Nelson |
1 |
0.21% |
1 |
2.63% |
| Greg Kroah-Hartman |
1 |
0.21% |
1 |
2.63% |
| Akinobu Mita |
1 |
0.21% |
1 |
2.63% |
| Total |
482 |
|
38 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* Helpers for DMA ops implementations. These generally rely on the fact that
* the allocated memory contains normal pages in the direct kernel mapping.
*/
#include <linux/dma-map-ops.h>
static struct page *dma_common_vaddr_to_page(void *cpu_addr)
{
if (is_vmalloc_addr(cpu_addr))
return vmalloc_to_page(cpu_addr);
return virt_to_page(cpu_addr);
}
/*
* Create scatter-list for the already allocated DMA buffer.
*/
int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
struct page *page = dma_common_vaddr_to_page(cpu_addr);
int ret;
ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
if (!ret)
sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
return ret;
}
/*
* Create userspace mapping for the DMA-coherent memory.
*/
int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
#ifdef CONFIG_MMU
unsigned long user_count = vma_pages(vma);
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long off = vma->vm_pgoff;
struct page *page = dma_common_vaddr_to_page(cpu_addr);
int ret = -ENXIO;
vma->vm_page_prot = dma_pgprot(dev, vma->vm_page_prot, attrs);
if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
return ret;
if (off >= count || user_count > count - off)
return -ENXIO;
return remap_pfn_range(vma, vma->vm_start,
page_to_pfn(page) + vma->vm_pgoff,
user_count << PAGE_SHIFT, vma->vm_page_prot);
#else
return -ENXIO;
#endif /* CONFIG_MMU */
}
struct page *dma_common_alloc_pages(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
struct page *page;
page = dma_alloc_contiguous(dev, size, gfp);
if (!page)
page = alloc_pages_node(dev_to_node(dev), gfp, get_order(size));
if (!page)
return NULL;
*dma_handle = ops->map_page(dev, page, 0, size, dir,
DMA_ATTR_SKIP_CPU_SYNC);
if (*dma_handle == DMA_MAPPING_ERROR) {
dma_free_contiguous(dev, page, size);
return NULL;
}
memset(page_address(page), 0, size);
return page;
}
void dma_common_free_pages(struct device *dev, size_t size, struct page *page,
dma_addr_t dma_handle, enum dma_data_direction dir)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (ops->unmap_page)
ops->unmap_page(dev, dma_handle, size, dir,
DMA_ATTR_SKIP_CPU_SYNC);
dma_free_contiguous(dev, page, size);
}