Release 4.13 lib/dma-noop.c
/*
* lib/dma-noop.c
*
* DMA operations that map to physical addresses without flushing memory.
*/
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>
#include <linux/pfn.h>
static void *dma_noop_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
unsigned long attrs)
{
void *ret;
ret = (void *)__get_free_pages(gfp, get_order(size));
if (ret)
*dma_handle = virt_to_phys(ret) - PFN_PHYS(dev->dma_pfn_offset);
return ret;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christian Bornträger | 59 | 86.76% | 1 | 33.33% |
Vladimir Murzin | 7 | 10.29% | 1 | 33.33% |
Krzysztof Kozlowski | 2 | 2.94% | 1 | 33.33% |
Total | 68 | 100.00% | 3 | 100.00% |
static void dma_noop_free(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t dma_addr,
unsigned long attrs)
{
free_pages((unsigned long)cpu_addr, get_order(size));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christian Bornträger | 37 | 94.87% | 1 | 50.00% |
Krzysztof Kozlowski | 2 | 5.13% | 1 | 50.00% |
Total | 39 | 100.00% | 2 | 100.00% |
static dma_addr_t dma_noop_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
unsigned long attrs)
{
return page_to_phys(page) + offset - PFN_PHYS(dev->dma_pfn_offset);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christian Bornträger | 37 | 80.43% | 1 | 33.33% |
Vladimir Murzin | 7 | 15.22% | 1 | 33.33% |
Krzysztof Kozlowski | 2 | 4.35% | 1 | 33.33% |
Total | 46 | 100.00% | 3 | 100.00% |
static int dma_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
enum dma_data_direction dir,
unsigned long attrs)
{
int i;
struct scatterlist *sg;
for_each_sg(sgl, sg, nents, i) {
dma_addr_t offset = PFN_PHYS(dev->dma_pfn_offset);
void *va;
BUG_ON(!sg_page(sg));
va = sg_virt(sg);
sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va) - offset;
sg_dma_len(sg) = sg->length;
}
return nents;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christian Bornträger | 90 | 86.54% | 1 | 33.33% |
Vladimir Murzin | 12 | 11.54% | 1 | 33.33% |
Krzysztof Kozlowski | 2 | 1.92% | 1 | 33.33% |
Total | 104 | 100.00% | 3 | 100.00% |
const struct dma_map_ops dma_noop_ops = {
.alloc = dma_noop_alloc,
.free = dma_noop_free,
.map_page = dma_noop_map_page,
.map_sg = dma_noop_map_sg,
};
EXPORT_SYMBOL(dma_noop_ops);
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christian Bornträger | 266 | 87.21% | 1 | 20.00% |
Vladimir Murzin | 29 | 9.51% | 1 | 20.00% |
Krzysztof Kozlowski | 8 | 2.62% | 1 | 20.00% |
Bart Van Assche | 2 | 0.66% | 2 | 40.00% |
Total | 305 | 100.00% | 5 | 100.00% |
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