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MIPS: Add support files for hugetlbfs.
Signed-off-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
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commit
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3 changed files with 216 additions and 0 deletions
114
arch/mips/include/asm/hugetlb.h
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114
arch/mips/include/asm/hugetlb.h
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@ -0,0 +1,114 @@
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2008, 2009 Cavium Networks, Inc.
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*/
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#ifndef __ASM_HUGETLB_H
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#define __ASM_HUGETLB_H
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#include <asm/page.h>
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static inline int is_hugepage_only_range(struct mm_struct *mm,
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unsigned long addr,
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unsigned long len)
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{
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return 0;
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}
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static inline int prepare_hugepage_range(struct file *file,
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unsigned long addr,
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unsigned long len)
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{
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unsigned long task_size = STACK_TOP;
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struct hstate *h = hstate_file(file);
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if (len & ~huge_page_mask(h))
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return -EINVAL;
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if (addr & ~huge_page_mask(h))
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return -EINVAL;
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if (len > task_size)
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return -ENOMEM;
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if (task_size - len < addr)
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return -EINVAL;
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return 0;
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}
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static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
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{
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}
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static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
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unsigned long addr,
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unsigned long end,
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unsigned long floor,
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unsigned long ceiling)
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{
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free_pgd_range(tlb, addr, end, floor, ceiling);
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}
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static inline 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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set_pte_at(mm, addr, ptep, pte);
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}
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static inline 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 clear;
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pte_t pte = *ptep;
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pte_val(clear) = (unsigned long)invalid_pte_table;
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set_pte_at(mm, addr, ptep, clear);
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return pte;
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}
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static inline 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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}
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static inline int huge_pte_none(pte_t pte)
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{
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unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
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return !val || (val == (unsigned long)invalid_pte_table);
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}
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static inline pte_t huge_pte_wrprotect(pte_t pte)
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{
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return pte_wrprotect(pte);
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}
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static inline 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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ptep_set_wrprotect(mm, addr, ptep);
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}
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static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
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unsigned long addr,
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pte_t *ptep, pte_t pte,
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int dirty)
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{
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return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
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}
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static inline pte_t huge_ptep_get(pte_t *ptep)
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{
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return *ptep;
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}
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static inline int arch_prepare_hugepage(struct page *page)
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{
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return 0;
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}
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static inline void arch_release_hugepage(struct page *page)
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{
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}
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#endif /* __ASM_HUGETLB_H */
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@ -8,6 +8,7 @@ obj-y += cache.o dma-default.o extable.o fault.o \
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obj-$(CONFIG_32BIT) += ioremap.o pgtable-32.o
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obj-$(CONFIG_64BIT) += pgtable-64.o
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obj-$(CONFIG_HIGHMEM) += highmem.o
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obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
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obj-$(CONFIG_CPU_LOONGSON2) += c-r4k.o cex-gen.o tlb-r4k.o
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obj-$(CONFIG_CPU_MIPS32) += c-r4k.o cex-gen.o tlb-r4k.o
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101
arch/mips/mm/hugetlbpage.c
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101
arch/mips/mm/hugetlbpage.c
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/*
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* MIPS Huge TLB Page Support for Kernel.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com>
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* Copyright 2005, Embedded Alley Solutions, Inc.
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* Matt Porter <mporter@embeddedalley.com>
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* Copyright (C) 2008, 2009 Cavium Networks, Inc.
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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/smp_lock.h>
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#include <linux/slab.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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pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr,
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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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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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pte = (pte_t *)pmd_alloc(mm, pud, addr);
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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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pgd = pgd_offset(mm, addr);
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if (pgd_present(*pgd)) {
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pud = pud_offset(pgd, addr);
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if (pud_present(*pud))
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pmd = pmd_offset(pud, addr);
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}
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return (pte_t *) pmd;
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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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/*
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* This function checks for proper alignment of input addr and len parameters.
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*/
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int is_aligned_hugepage_range(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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return 0;
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}
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struct page *
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follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
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{
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return ERR_PTR(-EINVAL);
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}
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int pmd_huge(pmd_t pmd)
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{
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return (pmd_val(pmd) & _PAGE_HUGE) != 0;
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}
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int pud_huge(pud_t pud)
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{
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return (pud_val(pud) & _PAGE_HUGE) != 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,
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pmd_t *pmd, int write)
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{
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struct page *page;
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page = pte_page(*(pte_t *)pmd);
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if (page)
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page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT);
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return page;
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}
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