319 lines
7.7 KiB
C
319 lines
7.7 KiB
C
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/*
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* arch/arm64/mm/hugetlbpage.c
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*
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* Copyright (C) 2013 Linaro Ltd.
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*
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* Based on arch/x86/mm/hugetlbpage.c.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/pagemap.h>
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#include <linux/err.h>
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#include <linux/sysctl.h>
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#include <asm/mman.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#include <asm/pgalloc.h>
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int pmd_huge(pmd_t pmd)
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{
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return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
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}
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int pud_huge(pud_t pud)
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{
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#ifndef __PAGETABLE_PMD_FOLDED
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return pud_val(pud) && !(pud_val(pud) & PUD_TABLE_BIT);
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#else
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return 0;
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#endif
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}
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static int find_num_contig(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte, size_t *pgsize)
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{
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pgd_t *pgd = pgd_offset(mm, addr);
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pud_t *pud;
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pmd_t *pmd;
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*pgsize = PAGE_SIZE;
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if (!pte_cont(pte))
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return 1;
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pud = pud_offset(pgd, addr);
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pmd = pmd_offset(pud, addr);
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if ((pte_t *)pmd == ptep) {
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*pgsize = PMD_SIZE;
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return CONT_PMDS;
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}
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return CONT_PTES;
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}
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void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte)
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{
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size_t pgsize;
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int i;
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int ncontig = find_num_contig(mm, addr, ptep, pte, &pgsize);
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unsigned long pfn;
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pgprot_t hugeprot;
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if (ncontig == 1) {
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set_pte_at(mm, addr, ptep, pte);
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return;
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}
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pfn = pte_pfn(pte);
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hugeprot = __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ pte_val(pte));
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for (i = 0; i < ncontig; i++) {
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pr_debug("%s: set pte %p to 0x%llx\n", __func__, ptep,
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pte_val(pfn_pte(pfn, hugeprot)));
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set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
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ptep++;
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pfn += pgsize >> PAGE_SHIFT;
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addr += pgsize;
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}
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}
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pte_t *huge_pte_alloc(struct mm_struct *mm,
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unsigned long addr, unsigned long sz)
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{
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pgd_t *pgd;
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pud_t *pud;
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pte_t *pte = NULL;
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pr_debug("%s: addr:0x%lx sz:0x%lx\n", __func__, addr, sz);
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pgd = pgd_offset(mm, addr);
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pud = pud_alloc(mm, pgd, addr);
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if (!pud)
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return NULL;
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if (sz == PUD_SIZE) {
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pte = (pte_t *)pud;
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} else if (sz == (PAGE_SIZE * CONT_PTES)) {
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pmd_t *pmd = pmd_alloc(mm, pud, addr);
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WARN_ON(addr & (sz - 1));
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/*
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* Note that if this code were ever ported to the
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* 32-bit arm platform then it will cause trouble in
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* the case where CONFIG_HIGHPTE is set, since there
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* will be no pte_unmap() to correspond with this
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* pte_alloc_map().
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*/
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pte = pte_alloc_map(mm, pmd, addr);
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} else if (sz == PMD_SIZE) {
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if (IS_ENABLED(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) &&
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pud_none(*pud))
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pte = huge_pmd_share(mm, addr, pud);
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else
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pte = (pte_t *)pmd_alloc(mm, pud, addr);
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} else if (sz == (PMD_SIZE * CONT_PMDS)) {
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pmd_t *pmd;
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pmd = pmd_alloc(mm, pud, addr);
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WARN_ON(addr & (sz - 1));
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return (pte_t *)pmd;
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}
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pr_debug("%s: addr:0x%lx sz:0x%lx ret pte=%p/0x%llx\n", __func__, addr,
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sz, pte, pte_val(*pte));
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return pte;
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}
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pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd = NULL;
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pte_t *pte = NULL;
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pgd = pgd_offset(mm, addr);
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pr_debug("%s: addr:0x%lx pgd:%p\n", __func__, addr, pgd);
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if (!pgd_present(*pgd))
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return NULL;
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pud = pud_offset(pgd, addr);
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if (!pud_present(*pud))
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return NULL;
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if (pud_huge(*pud))
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return (pte_t *)pud;
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pmd = pmd_offset(pud, addr);
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if (!pmd_present(*pmd))
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return NULL;
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if (pte_cont(pmd_pte(*pmd))) {
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pmd = pmd_offset(
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pud, (addr & CONT_PMD_MASK));
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return (pte_t *)pmd;
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}
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if (pmd_huge(*pmd))
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return (pte_t *)pmd;
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pte = pte_offset_kernel(pmd, addr);
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if (pte_present(*pte) && pte_cont(*pte)) {
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pte = pte_offset_kernel(
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pmd, (addr & CONT_PTE_MASK));
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return pte;
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}
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return NULL;
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}
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pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
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struct page *page, int writable)
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{
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size_t pagesize = huge_page_size(hstate_vma(vma));
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if (pagesize == CONT_PTE_SIZE) {
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entry = pte_mkcont(entry);
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} else if (pagesize == CONT_PMD_SIZE) {
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entry = pmd_pte(pmd_mkcont(pte_pmd(entry)));
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} else if (pagesize != PUD_SIZE && pagesize != PMD_SIZE) {
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pr_warn("%s: unrecognized huge page size 0x%lx\n",
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__func__, pagesize);
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}
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return entry;
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}
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pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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pte_t pte;
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if (pte_cont(*ptep)) {
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int ncontig, i;
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size_t pgsize;
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pte_t *cpte;
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bool is_dirty = false;
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cpte = huge_pte_offset(mm, addr);
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ncontig = find_num_contig(mm, addr, cpte, *cpte, &pgsize);
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/* save the 1st pte to return */
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pte = ptep_get_and_clear(mm, addr, cpte);
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for (i = 1, addr += pgsize; i < ncontig; ++i, addr += pgsize) {
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/*
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* If HW_AFDBM is enabled, then the HW could
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* turn on the dirty bit for any of the page
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* in the set, so check them all.
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*/
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++cpte;
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if (pte_dirty(ptep_get_and_clear(mm, addr, cpte)))
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is_dirty = true;
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}
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if (is_dirty)
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return pte_mkdirty(pte);
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else
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return pte;
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} else {
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return ptep_get_and_clear(mm, addr, ptep);
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}
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}
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int huge_ptep_set_access_flags(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep,
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pte_t pte, int dirty)
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{
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pte_t *cpte;
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if (pte_cont(pte)) {
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int ncontig, i, changed = 0;
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size_t pgsize = 0;
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unsigned long pfn = pte_pfn(pte);
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/* Select all bits except the pfn */
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pgprot_t hugeprot =
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__pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^
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pte_val(pte));
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cpte = huge_pte_offset(vma->vm_mm, addr);
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pfn = pte_pfn(*cpte);
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ncontig = find_num_contig(vma->vm_mm, addr, cpte,
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*cpte, &pgsize);
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for (i = 0; i < ncontig; ++i, ++cpte, addr += pgsize) {
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changed |= ptep_set_access_flags(vma, addr, cpte,
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pfn_pte(pfn,
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hugeprot),
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dirty);
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pfn += pgsize >> PAGE_SHIFT;
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}
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return changed;
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} else {
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return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
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}
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}
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void huge_ptep_set_wrprotect(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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if (pte_cont(*ptep)) {
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int ncontig, i;
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pte_t *cpte;
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size_t pgsize = 0;
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cpte = huge_pte_offset(mm, addr);
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ncontig = find_num_contig(mm, addr, cpte, *cpte, &pgsize);
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for (i = 0; i < ncontig; ++i, ++cpte, addr += pgsize)
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ptep_set_wrprotect(mm, addr, cpte);
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} else {
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ptep_set_wrprotect(mm, addr, ptep);
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}
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}
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void huge_ptep_clear_flush(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep)
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{
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if (pte_cont(*ptep)) {
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int ncontig, i;
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pte_t *cpte;
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size_t pgsize = 0;
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cpte = huge_pte_offset(vma->vm_mm, addr);
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ncontig = find_num_contig(vma->vm_mm, addr, cpte,
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*cpte, &pgsize);
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for (i = 0; i < ncontig; ++i, ++cpte, addr += pgsize)
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ptep_clear_flush(vma, addr, cpte);
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} else {
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ptep_clear_flush(vma, addr, ptep);
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}
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}
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static __init int setup_hugepagesz(char *opt)
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{
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unsigned long ps = memparse(opt, &opt);
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if (ps == PMD_SIZE) {
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hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
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} else if (ps == PUD_SIZE) {
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hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
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} else if (ps == (PAGE_SIZE * CONT_PTES)) {
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hugetlb_add_hstate(CONT_PTE_SHIFT);
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} else if (ps == (PMD_SIZE * CONT_PMDS)) {
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hugetlb_add_hstate((PMD_SHIFT + CONT_PMD_SHIFT) - PAGE_SHIFT);
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} else {
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hugetlb_bad_size();
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pr_err("hugepagesz: Unsupported page size %lu K\n", ps >> 10);
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return 0;
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}
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return 1;
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}
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__setup("hugepagesz=", setup_hugepagesz);
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#ifdef CONFIG_ARM64_64K_PAGES
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static __init int add_default_hugepagesz(void)
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{
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if (size_to_hstate(CONT_PTES * PAGE_SIZE) == NULL)
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hugetlb_add_hstate(CONT_PMD_SHIFT);
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return 0;
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}
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arch_initcall(add_default_hugepagesz);
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#endif
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