cregit-Linux how code gets into the kernel

Release 4.13 lib/dma-noop.c

Directory: lib
/*
 *      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

PersonTokensPropCommitsCommitProp
Christian Bornträger5986.76%133.33%
Vladimir Murzin710.29%133.33%
Krzysztof Kozlowski22.94%133.33%
Total68100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Christian Bornträger3794.87%150.00%
Krzysztof Kozlowski25.13%150.00%
Total39100.00%2100.00%


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

PersonTokensPropCommitsCommitProp
Christian Bornträger3780.43%133.33%
Vladimir Murzin715.22%133.33%
Krzysztof Kozlowski24.35%133.33%
Total46100.00%3100.00%


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

PersonTokensPropCommitsCommitProp
Christian Bornträger9086.54%133.33%
Vladimir Murzin1211.54%133.33%
Krzysztof Kozlowski21.92%133.33%
Total104100.00%3100.00%

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

PersonTokensPropCommitsCommitProp
Christian Bornträger26687.21%120.00%
Vladimir Murzin299.51%120.00%
Krzysztof Kozlowski82.62%120.00%
Bart Van Assche20.66%240.00%
Total305100.00%5100.00%
Directory: lib
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