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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273// 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){ struct vm_struct *area = find_vm_area(cpu_addr);
if (!area || !(area->flags & VM_DMA_COHERENT)) return NULL; WARN(area->flags != VM_DMA_COHERENT, "unexpected flags in area: %p\n", cpu_addr); return area->pages;}
/* * 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){ void *vaddr;
vaddr = vmap(pages, PAGE_ALIGN(size) >> PAGE_SHIFT, VM_DMA_COHERENT, prot); if (vaddr) find_vm_area(vaddr)->pages = pages; return vaddr;}
/* * 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){ int count = PAGE_ALIGN(size) >> PAGE_SHIFT; struct page **pages; void *vaddr; int i;
pages = kvmalloc_objs(struct page *, count); if (!pages) return NULL; for (i = 0; i < count; i++) pages[i] = page++; vaddr = vmap(pages, count, VM_DMA_COHERENT, prot); kvfree(pages);
return vaddr;}
/* * Unmaps a range previously mapped by dma_common_*_remap */void dma_common_free_remap(void *cpu_addr, size_t size){ struct vm_struct *area = find_vm_area(cpu_addr);
if (!area || !(area->flags & VM_DMA_COHERENT)) { WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr); return; }
vunmap(cpu_addr);}