linux/kernel/dma/remap.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2014 The Linux Foundation
 */
#include <linux/dma-map-ops.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>

struct page **dma_common_find_pages(void *cpu_addr)
{ … }

/*
 * Remaps an array of PAGE_SIZE pages into another vm_area.
 * Cannot be used in non-sleeping contexts
 */
void *dma_common_pages_remap(struct page **pages, size_t size,
			 pgprot_t prot, const void *caller)
{ … }

/*
 * Remaps an allocated contiguous region into another vm_area.
 * Cannot be used in non-sleeping contexts
 */
void *dma_common_contiguous_remap(struct page *page, size_t size,
			pgprot_t prot, const void *caller)
{ … }

/*
 * Unmaps a range previously mapped by dma_common_*_remap
 */
void dma_common_free_remap(void *cpu_addr, size_t size)
{ … }