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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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a53c8fab3f
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
132 lines
2.5 KiB
C
132 lines
2.5 KiB
C
/*
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* IBM System z Huge TLB Page Support for Kernel.
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*
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* Copyright IBM Corp. 2007
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* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
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*/
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *pteptr, pte_t pteval)
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{
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pmd_t *pmdp = (pmd_t *) pteptr;
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unsigned long mask;
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if (!MACHINE_HAS_HPAGE) {
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pteptr = (pte_t *) pte_page(pteval)[1].index;
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mask = pte_val(pteval) &
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(_SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO);
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pte_val(pteval) = (_SEGMENT_ENTRY + __pa(pteptr)) | mask;
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}
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pmd_val(*pmdp) = pte_val(pteval);
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}
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int arch_prepare_hugepage(struct page *page)
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{
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unsigned long addr = page_to_phys(page);
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pte_t pte;
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pte_t *ptep;
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int i;
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if (MACHINE_HAS_HPAGE)
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return 0;
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ptep = (pte_t *) pte_alloc_one(&init_mm, addr);
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if (!ptep)
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return -ENOMEM;
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pte = mk_pte(page, PAGE_RW);
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for (i = 0; i < PTRS_PER_PTE; i++) {
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set_pte_at(&init_mm, addr + i * PAGE_SIZE, ptep + i, pte);
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pte_val(pte) += PAGE_SIZE;
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}
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page[1].index = (unsigned long) ptep;
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return 0;
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}
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void arch_release_hugepage(struct page *page)
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{
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pte_t *ptep;
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if (MACHINE_HAS_HPAGE)
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return;
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ptep = (pte_t *) page[1].index;
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if (!ptep)
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return;
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clear_table((unsigned long *) ptep, _PAGE_TYPE_EMPTY,
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PTRS_PER_PTE * sizeof(pte_t));
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page_table_free(&init_mm, (unsigned long *) ptep);
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page[1].index = 0;
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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 *pgdp;
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pud_t *pudp;
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pmd_t *pmdp = NULL;
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pgdp = pgd_offset(mm, addr);
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pudp = pud_alloc(mm, pgdp, addr);
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if (pudp)
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pmdp = pmd_alloc(mm, pudp, addr);
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return (pte_t *) pmdp;
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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 *pgdp;
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pud_t *pudp;
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pmd_t *pmdp = NULL;
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pgdp = pgd_offset(mm, addr);
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if (pgd_present(*pgdp)) {
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pudp = pud_offset(pgdp, addr);
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if (pud_present(*pudp))
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pmdp = pmd_offset(pudp, addr);
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}
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return (pte_t *) pmdp;
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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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struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
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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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if (!MACHINE_HAS_HPAGE)
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return 0;
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return !!(pmd_val(pmd) & _SEGMENT_ENTRY_LARGE);
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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 *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
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pmd_t *pmdp, int write)
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{
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struct page *page;
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if (!MACHINE_HAS_HPAGE)
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return NULL;
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page = pmd_page(*pmdp);
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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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