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29 lines
993 B
29 lines
993 B
// SPDX-License-Identifier: GPL-2.0-only |
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#include <linux/mm.h> |
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#include <linux/io-mapping.h> |
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/** |
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* io_mapping_map_user - remap an I/O mapping to userspace |
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* @iomap: the source io_mapping |
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* @vma: user vma to map to |
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* @addr: target user address to start at |
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* @pfn: physical address of kernel memory |
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* @size: size of map area |
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* |
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* Note: this is only safe if the mm semaphore is held when called. |
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*/ |
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int io_mapping_map_user(struct io_mapping *iomap, struct vm_area_struct *vma, |
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unsigned long addr, unsigned long pfn, unsigned long size) |
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{ |
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vm_flags_t expected_flags = VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; |
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if (WARN_ON_ONCE((vma->vm_flags & expected_flags) != expected_flags)) |
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return -EINVAL; |
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/* We rely on prevalidation of the io-mapping to skip track_pfn(). */ |
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return remap_pfn_range_notrack(vma, addr, pfn, size, |
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__pgprot((pgprot_val(iomap->prot) & _PAGE_CACHE_MASK) | |
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(pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK))); |
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} |
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EXPORT_SYMBOL_GPL(io_mapping_map_user);
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