// SPDX-License-Identifier: GPL-2.0/* * DMA operations that map to virtual addresses without flushing memory. */#include <linux/export.h>#include <linux/mm.h>#include <linux/dma-mapping.h>#include <linux/scatterlist.h> static void *dma_virt_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 | __GFP_ZERO, get_order(size));	if (ret)		*dma_handle = (uintptr_t)ret;	return ret;} static void dma_virt_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));} static dma_addr_t dma_virt_map_page(struct device *dev, struct page *page,				    unsigned long offset, size_t size,				    enum dma_data_direction dir,				    unsigned long attrs){	return (uintptr_t)(page_address(page) + offset);} static int dma_virt_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) {		BUG_ON(!sg_page(sg));		sg_dma_address(sg) = (uintptr_t)sg_virt(sg);		sg_dma_len(sg) = sg->length;	} 	return nents;} const struct dma_map_ops dma_virt_ops = {	.alloc			= dma_virt_alloc,	.free			= dma_virt_free,	.map_page		= dma_virt_map_page,	.map_sg			= dma_virt_map_sg,};EXPORT_SYMBOL(dma_virt_ops);