70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Based on arch/arm/mm/copypage.c
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*
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* Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
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* Copyright (C) 2012 ARM Ltd.
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*/
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#include <linux/bitops.h>
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#include <linux/mm.h>
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#include <asm/page.h>
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#include <asm/cacheflush.h>
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#include <asm/cpufeature.h>
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#include <asm/mte.h>
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void copy_highpage(struct page *to, struct page *from)
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{
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void *kto = page_address(to);
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void *kfrom = page_address(from);
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struct folio *src = page_folio(from);
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struct folio *dst = page_folio(to);
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unsigned int i, nr_pages;
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copy_page(kto, kfrom);
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if (kasan_hw_tags_enabled())
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page_kasan_tag_reset(to);
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if (!system_supports_mte())
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return;
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if (folio_test_hugetlb(src)) {
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if (!folio_test_hugetlb_mte_tagged(src) ||
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from != folio_page(src, 0))
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return;
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WARN_ON_ONCE(!folio_try_hugetlb_mte_tagging(dst));
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/*
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* Populate tags for all subpages.
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*
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* Don't assume the first page is head page since
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* huge page copy may start from any subpage.
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*/
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nr_pages = folio_nr_pages(src);
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for (i = 0; i < nr_pages; i++) {
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kfrom = page_address(folio_page(src, i));
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kto = page_address(folio_page(dst, i));
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mte_copy_page_tags(kto, kfrom);
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}
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folio_set_hugetlb_mte_tagged(dst);
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} else if (page_mte_tagged(from)) {
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/* It's a new page, shouldn't have been tagged yet */
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WARN_ON_ONCE(!try_page_mte_tagging(to));
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mte_copy_page_tags(kto, kfrom);
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set_page_mte_tagged(to);
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}
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}
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EXPORT_SYMBOL(copy_highpage);
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void copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma)
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{
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copy_highpage(to, from);
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flush_dcache_page(to);
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}
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EXPORT_SYMBOL_GPL(copy_user_highpage);
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