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