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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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311 lines
6.6 KiB
C
311 lines
6.6 KiB
C
![]() |
/*
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* SPARC64 Huge TLB page support.
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*
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* Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
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*/
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#include <linux/config.h>
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#include <linux/init.h>
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#include <linux/module.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/sysctl.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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#include <asm/cacheflush.h>
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#include <asm/mmu_context.h>
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static pte_t *huge_pte_alloc(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;
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pte_t *pte = NULL;
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pgd = pgd_offset(mm, addr);
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if (pgd) {
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pud = pud_offset(pgd, addr);
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if (pud) {
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pmd = pmd_alloc(mm, pud, addr);
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if (pmd)
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pte = pte_alloc_map(mm, pmd, addr);
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}
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}
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return pte;
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}
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static 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;
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pte_t *pte = NULL;
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pgd = pgd_offset(mm, addr);
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if (pgd) {
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pud = pud_offset(pgd, addr);
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if (pud) {
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pmd = pmd_offset(pud, addr);
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if (pmd)
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pte = pte_offset_map(pmd, addr);
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}
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}
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return pte;
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}
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#define mk_pte_huge(entry) do { pte_val(entry) |= _PAGE_SZHUGE; } while (0)
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static void set_huge_pte(struct mm_struct *mm, struct vm_area_struct *vma,
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unsigned long addr,
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struct page *page, pte_t * page_table, int write_access)
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{
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unsigned long i;
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pte_t entry;
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add_mm_counter(mm, rss, HPAGE_SIZE / PAGE_SIZE);
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if (write_access)
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entry = pte_mkwrite(pte_mkdirty(mk_pte(page,
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vma->vm_page_prot)));
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else
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entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot));
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entry = pte_mkyoung(entry);
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mk_pte_huge(entry);
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for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
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set_pte_at(mm, addr, page_table, entry);
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page_table++;
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addr += PAGE_SIZE;
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pte_val(entry) += PAGE_SIZE;
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}
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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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int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
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struct vm_area_struct *vma)
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{
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pte_t *src_pte, *dst_pte, entry;
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struct page *ptepage;
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unsigned long addr = vma->vm_start;
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unsigned long end = vma->vm_end;
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int i;
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while (addr < end) {
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dst_pte = huge_pte_alloc(dst, addr);
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if (!dst_pte)
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goto nomem;
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src_pte = huge_pte_offset(src, addr);
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BUG_ON(!src_pte || pte_none(*src_pte));
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entry = *src_pte;
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ptepage = pte_page(entry);
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get_page(ptepage);
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for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
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set_pte_at(dst, addr, dst_pte, entry);
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pte_val(entry) += PAGE_SIZE;
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dst_pte++;
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addr += PAGE_SIZE;
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}
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add_mm_counter(dst, rss, HPAGE_SIZE / PAGE_SIZE);
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}
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return 0;
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nomem:
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return -ENOMEM;
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}
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int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
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struct page **pages, struct vm_area_struct **vmas,
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unsigned long *position, int *length, int i)
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{
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unsigned long vaddr = *position;
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int remainder = *length;
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WARN_ON(!is_vm_hugetlb_page(vma));
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while (vaddr < vma->vm_end && remainder) {
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if (pages) {
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pte_t *pte;
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struct page *page;
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pte = huge_pte_offset(mm, vaddr);
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/* hugetlb should be locked, and hence, prefaulted */
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BUG_ON(!pte || pte_none(*pte));
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page = pte_page(*pte);
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WARN_ON(!PageCompound(page));
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get_page(page);
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pages[i] = page;
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}
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if (vmas)
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vmas[i] = vma;
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vaddr += PAGE_SIZE;
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--remainder;
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++i;
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}
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*length = remainder;
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*position = vaddr;
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return i;
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}
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struct page *follow_huge_addr(struct mm_struct *mm,
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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 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 *pmd, int write)
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{
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return NULL;
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}
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void unmap_hugepage_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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struct mm_struct *mm = vma->vm_mm;
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unsigned long address;
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pte_t *pte;
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struct page *page;
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int i;
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BUG_ON(start & (HPAGE_SIZE - 1));
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BUG_ON(end & (HPAGE_SIZE - 1));
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for (address = start; address < end; address += HPAGE_SIZE) {
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pte = huge_pte_offset(mm, address);
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BUG_ON(!pte);
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if (pte_none(*pte))
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continue;
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page = pte_page(*pte);
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put_page(page);
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for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
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pte_clear(mm, address+(i*PAGE_SIZE), pte);
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pte++;
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}
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}
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add_mm_counter(mm, rss, -((end - start) >> PAGE_SHIFT));
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flush_tlb_range(vma, start, end);
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}
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static void context_reload(void *__data)
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{
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struct mm_struct *mm = __data;
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if (mm == current->mm)
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load_secondary_context(mm);
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}
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int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma)
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{
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struct mm_struct *mm = current->mm;
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unsigned long addr;
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int ret = 0;
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/* On UltraSPARC-III+ and later, configure the second half of
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* the Data-TLB for huge pages.
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*/
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if (tlb_type == cheetah_plus) {
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unsigned long ctx;
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spin_lock(&ctx_alloc_lock);
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ctx = mm->context.sparc64_ctx_val;
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ctx &= ~CTX_PGSZ_MASK;
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ctx |= CTX_PGSZ_BASE << CTX_PGSZ0_SHIFT;
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ctx |= CTX_PGSZ_HUGE << CTX_PGSZ1_SHIFT;
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if (ctx != mm->context.sparc64_ctx_val) {
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/* When changing the page size fields, we
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* must perform a context flush so that no
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* stale entries match. This flush must
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* occur with the original context register
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* settings.
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*/
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do_flush_tlb_mm(mm);
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/* Reload the context register of all processors
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* also executing in this address space.
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*/
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mm->context.sparc64_ctx_val = ctx;
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on_each_cpu(context_reload, mm, 0, 0);
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}
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spin_unlock(&ctx_alloc_lock);
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}
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BUG_ON(vma->vm_start & ~HPAGE_MASK);
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BUG_ON(vma->vm_end & ~HPAGE_MASK);
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spin_lock(&mm->page_table_lock);
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for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) {
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unsigned long idx;
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pte_t *pte = huge_pte_alloc(mm, addr);
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struct page *page;
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if (!pte) {
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ret = -ENOMEM;
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goto out;
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}
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if (!pte_none(*pte))
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continue;
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idx = ((addr - vma->vm_start) >> HPAGE_SHIFT)
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+ (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
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page = find_get_page(mapping, idx);
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if (!page) {
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/* charge the fs quota first */
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if (hugetlb_get_quota(mapping)) {
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ret = -ENOMEM;
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goto out;
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}
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page = alloc_huge_page();
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if (!page) {
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hugetlb_put_quota(mapping);
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ret = -ENOMEM;
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goto out;
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}
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ret = add_to_page_cache(page, mapping, idx, GFP_ATOMIC);
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if (! ret) {
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unlock_page(page);
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} else {
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hugetlb_put_quota(mapping);
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free_huge_page(page);
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goto out;
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}
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}
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set_huge_pte(mm, vma, addr, page, pte, vma->vm_flags & VM_WRITE);
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}
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out:
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spin_unlock(&mm->page_table_lock);
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return ret;
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}
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