![Andrea Arcangeli](/assets/img/avatar_default.png)
pte alloc routines must wait for split_huge_page if the pmd is not present and not null (i.e. pmd_trans_splitting). The additional branches are optimized away at compile time by pmd_trans_splitting if the config option is off. However we must pass the vma down in order to know the anon_vma lock to wait for. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
208 lines
4.8 KiB
C
208 lines
4.8 KiB
C
/*
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* IA-64 Huge TLB Page Support for Kernel.
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*
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* Copyright (C) 2002-2004 Rohit Seth <rohit.seth@intel.com>
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* Copyright (C) 2003-2004 Ken Chen <kenneth.w.chen@intel.com>
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*
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* Sep, 2003: add numa support
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* Feb, 2004: dynamic hugetlb page size via boot parameter
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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/module.h>
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#include <linux/sysctl.h>
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#include <linux/log2.h>
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#include <asm/mman.h>
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#include <asm/pgalloc.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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unsigned int hpage_shift = HPAGE_SHIFT_DEFAULT;
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EXPORT_SYMBOL(hpage_shift);
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pte_t *
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huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz)
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{
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unsigned long taddr = htlbpage_to_page(addr);
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte = NULL;
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pgd = pgd_offset(mm, taddr);
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pud = pud_alloc(mm, pgd, taddr);
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if (pud) {
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pmd = pmd_alloc(mm, pud, taddr);
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if (pmd)
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pte = pte_alloc_map(mm, NULL, pmd, taddr);
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}
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return pte;
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}
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pte_t *
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huge_pte_offset (struct mm_struct *mm, unsigned long addr)
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{
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unsigned long taddr = htlbpage_to_page(addr);
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte = NULL;
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pgd = pgd_offset(mm, taddr);
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if (pgd_present(*pgd)) {
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pud = pud_offset(pgd, taddr);
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if (pud_present(*pud)) {
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pmd = pmd_offset(pud, taddr);
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if (pmd_present(*pmd))
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pte = pte_offset_map(pmd, taddr);
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}
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}
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return pte;
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}
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int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
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{
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return 0;
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}
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#define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; }
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/*
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* Don't actually need to do any preparation, but need to make sure
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* the address is in the right region.
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*/
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int prepare_hugepage_range(struct file *file,
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unsigned long addr, unsigned long len)
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{
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if (len & ~HPAGE_MASK)
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return -EINVAL;
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if (addr & ~HPAGE_MASK)
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return -EINVAL;
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if (REGION_NUMBER(addr) != RGN_HPAGE)
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return -EINVAL;
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return 0;
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}
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struct page *follow_huge_addr(struct mm_struct *mm, unsigned long addr, int write)
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{
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struct page *page;
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pte_t *ptep;
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if (REGION_NUMBER(addr) != RGN_HPAGE)
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return ERR_PTR(-EINVAL);
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ptep = huge_pte_offset(mm, addr);
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if (!ptep || pte_none(*ptep))
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return NULL;
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page = pte_page(*ptep);
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page += ((addr & ~HPAGE_MASK) >> PAGE_SHIFT);
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return page;
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}
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int pmd_huge(pmd_t pmd)
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{
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return 0;
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}
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int pud_huge(pud_t pud)
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{
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return 0;
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}
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struct page *
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follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd, int write)
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{
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return NULL;
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}
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void hugetlb_free_pgd_range(struct mmu_gather *tlb,
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unsigned long addr, unsigned long end,
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unsigned long floor, unsigned long ceiling)
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{
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/*
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* This is called to free hugetlb page tables.
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*
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* The offset of these addresses from the base of the hugetlb
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* region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that
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* the standard free_pgd_range will free the right page tables.
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*
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* If floor and ceiling are also in the hugetlb region, they
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* must likewise be scaled down; but if outside, left unchanged.
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*/
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addr = htlbpage_to_page(addr);
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end = htlbpage_to_page(end);
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if (REGION_NUMBER(floor) == RGN_HPAGE)
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floor = htlbpage_to_page(floor);
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if (REGION_NUMBER(ceiling) == RGN_HPAGE)
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ceiling = htlbpage_to_page(ceiling);
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free_pgd_range(tlb, addr, end, floor, ceiling);
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}
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unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
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unsigned long pgoff, unsigned long flags)
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{
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struct vm_area_struct *vmm;
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if (len > RGN_MAP_LIMIT)
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return -ENOMEM;
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if (len & ~HPAGE_MASK)
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return -EINVAL;
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/* Handle MAP_FIXED */
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if (flags & MAP_FIXED) {
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if (prepare_hugepage_range(file, addr, len))
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return -EINVAL;
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return addr;
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}
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/* This code assumes that RGN_HPAGE != 0. */
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if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1)))
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addr = HPAGE_REGION_BASE;
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else
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addr = ALIGN(addr, HPAGE_SIZE);
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for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
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/* At this point: (!vmm || addr < vmm->vm_end). */
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if (REGION_OFFSET(addr) + len > RGN_MAP_LIMIT)
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return -ENOMEM;
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if (!vmm || (addr + len) <= vmm->vm_start)
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return addr;
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addr = ALIGN(vmm->vm_end, HPAGE_SIZE);
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}
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}
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static int __init hugetlb_setup_sz(char *str)
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{
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u64 tr_pages;
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unsigned long long size;
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if (ia64_pal_vm_page_size(&tr_pages, NULL) != 0)
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/*
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* shouldn't happen, but just in case.
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*/
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tr_pages = 0x15557000UL;
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size = memparse(str, &str);
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if (*str || !is_power_of_2(size) || !(tr_pages & size) ||
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size <= PAGE_SIZE ||
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size >= (1UL << PAGE_SHIFT << MAX_ORDER)) {
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printk(KERN_WARNING "Invalid huge page size specified\n");
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return 1;
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}
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hpage_shift = __ffs(size);
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/*
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* boot cpu already executed ia64_mmu_init, and has HPAGE_SHIFT_DEFAULT
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* override here with new page shift.
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*/
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ia64_set_rr(HPAGE_REGION_BASE, hpage_shift << 2);
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return 0;
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}
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early_param("hugepagesz", hugetlb_setup_sz);
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