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302 lines
6.7 KiB
302 lines
6.7 KiB
/*
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* SPARC64 Huge TLB page support.
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*
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* Copyright (C) 2002, 2003, 2006 David S. Miller (davem@davemloft.net)
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*/
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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/sysctl.h>
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#include <asm/mman.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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#include <asm/mmu_context.h>
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/* Slightly simplified from the non-hugepage variant because by
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* definition we don't have to worry about any page coloring stuff
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*/
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static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
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unsigned long addr,
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unsigned long len,
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unsigned long pgoff,
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unsigned long flags)
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{
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unsigned long task_size = TASK_SIZE;
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struct vm_unmapped_area_info info;
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if (test_thread_flag(TIF_32BIT))
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task_size = STACK_TOP32;
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info.flags = 0;
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info.length = len;
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info.low_limit = TASK_UNMAPPED_BASE;
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info.high_limit = min(task_size, VA_EXCLUDE_START);
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info.align_mask = PAGE_MASK & ~HPAGE_MASK;
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info.align_offset = 0;
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addr = vm_unmapped_area(&info);
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if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
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VM_BUG_ON(addr != -ENOMEM);
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info.low_limit = VA_EXCLUDE_END;
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info.high_limit = task_size;
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addr = vm_unmapped_area(&info);
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}
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return addr;
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}
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static unsigned long
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hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
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const unsigned long len,
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const unsigned long pgoff,
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const unsigned long flags)
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{
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struct mm_struct *mm = current->mm;
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unsigned long addr = addr0;
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struct vm_unmapped_area_info info;
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/* This should only ever run for 32-bit processes. */
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BUG_ON(!test_thread_flag(TIF_32BIT));
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info.flags = VM_UNMAPPED_AREA_TOPDOWN;
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info.length = len;
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info.low_limit = PAGE_SIZE;
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info.high_limit = mm->mmap_base;
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info.align_mask = PAGE_MASK & ~HPAGE_MASK;
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info.align_offset = 0;
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addr = vm_unmapped_area(&info);
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/*
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* A failed mmap() very likely causes application failure,
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* so fall back to the bottom-up function here. This scenario
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* can happen with large stack limits and large mmap()
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* allocations.
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*/
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if (addr & ~PAGE_MASK) {
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VM_BUG_ON(addr != -ENOMEM);
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info.flags = 0;
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info.low_limit = TASK_UNMAPPED_BASE;
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info.high_limit = STACK_TOP32;
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addr = vm_unmapped_area(&info);
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}
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return addr;
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}
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unsigned long
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hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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unsigned long task_size = TASK_SIZE;
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if (test_thread_flag(TIF_32BIT))
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task_size = STACK_TOP32;
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if (len & ~HPAGE_MASK)
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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 (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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if (addr) {
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addr = ALIGN(addr, HPAGE_SIZE);
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vma = find_vma(mm, addr);
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if (task_size - len >= addr &&
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(!vma || addr + len <= vma->vm_start))
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return addr;
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}
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if (mm->get_unmapped_area == arch_get_unmapped_area)
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return hugetlb_get_unmapped_area_bottomup(file, addr, len,
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pgoff, flags);
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else
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return hugetlb_get_unmapped_area_topdown(file, addr, len,
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pgoff, flags);
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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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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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pte_t *pte = NULL;
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pgd = pgd_offset(mm, addr);
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if (!pgd_none(*pgd)) {
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pud = pud_offset(pgd, addr);
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if (!pud_none(*pud))
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pte = (pte_t *)pmd_offset(pud, addr);
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}
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return pte;
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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 entry)
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{
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pte_t orig;
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if (!pte_present(*ptep) && pte_present(entry))
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mm->context.hugetlb_pte_count++;
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addr &= HPAGE_MASK;
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orig = *ptep;
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*ptep = entry;
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/* Issue TLB flush at REAL_HPAGE_SIZE boundaries */
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maybe_tlb_batch_add(mm, addr, ptep, orig, 0);
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maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, orig, 0);
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}
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pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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pte_t entry;
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entry = *ptep;
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if (pte_present(entry))
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mm->context.hugetlb_pte_count--;
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addr &= HPAGE_MASK;
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*ptep = __pte(0UL);
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/* Issue TLB flush at REAL_HPAGE_SIZE boundaries */
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maybe_tlb_batch_add(mm, addr, ptep, entry, 0);
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maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, entry, 0);
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return entry;
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}
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int pmd_huge(pmd_t pmd)
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{
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return !pmd_none(pmd) &&
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(pmd_val(pmd) & (_PAGE_VALID|_PAGE_PMD_HUGE)) != _PAGE_VALID;
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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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static void hugetlb_free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
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unsigned long addr)
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{
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pgtable_t token = pmd_pgtable(*pmd);
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pmd_clear(pmd);
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pte_free_tlb(tlb, token, addr);
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atomic_long_dec(&tlb->mm->nr_ptes);
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}
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static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
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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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pmd_t *pmd;
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unsigned long next;
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unsigned long start;
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start = addr;
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pmd = pmd_offset(pud, addr);
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do {
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next = pmd_addr_end(addr, end);
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if (pmd_none(*pmd))
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continue;
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if (is_hugetlb_pmd(*pmd))
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pmd_clear(pmd);
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else
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hugetlb_free_pte_range(tlb, pmd, addr);
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} while (pmd++, addr = next, addr != end);
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start &= PUD_MASK;
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if (start < floor)
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return;
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if (ceiling) {
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ceiling &= PUD_MASK;
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if (!ceiling)
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return;
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}
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if (end - 1 > ceiling - 1)
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return;
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pmd = pmd_offset(pud, start);
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pud_clear(pud);
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pmd_free_tlb(tlb, pmd, start);
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mm_dec_nr_pmds(tlb->mm);
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}
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static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
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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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pud_t *pud;
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unsigned long next;
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unsigned long start;
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start = addr;
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pud = pud_offset(pgd, addr);
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do {
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next = pud_addr_end(addr, end);
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if (pud_none_or_clear_bad(pud))
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continue;
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hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
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ceiling);
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} while (pud++, addr = next, addr != end);
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start &= PGDIR_MASK;
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if (start < floor)
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return;
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if (ceiling) {
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ceiling &= PGDIR_MASK;
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if (!ceiling)
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return;
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}
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if (end - 1 > ceiling - 1)
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return;
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pud = pud_offset(pgd, start);
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pgd_clear(pgd);
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pud_free_tlb(tlb, pud, start);
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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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pgd_t *pgd;
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unsigned long next;
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pgd = pgd_offset(tlb->mm, addr);
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do {
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next = pgd_addr_end(addr, end);
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if (pgd_none_or_clear_bad(pgd))
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continue;
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hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling);
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} while (pgd++, addr = next, addr != end);
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}
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