2 * arch/sh64/mm/hugetlbpage.c
4 * SuperH HugeTLB page support.
6 * Cloned from sparc64 by Paul Mundt.
8 * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
11 #include <linux/config.h>
12 #include <linux/init.h>
15 #include <linux/hugetlb.h>
16 #include <linux/pagemap.h>
17 #include <linux/smp_lock.h>
18 #include <linux/slab.h>
19 #include <linux/sysctl.h>
22 #include <asm/pgalloc.h>
24 #include <asm/tlbflush.h>
25 #include <asm/cacheflush.h>
27 pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
33 pgd = pgd_offset(mm, addr);
35 pmd = pmd_alloc(mm, pgd, addr);
37 pte = pte_alloc_map(mm, pmd, addr);
42 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
48 pgd = pgd_offset(mm, addr);
50 pmd = pmd_offset(pgd, addr);
52 pte = pte_offset_map(pmd, addr);
57 #define mk_pte_huge(entry) do { pte_val(entry) |= _PAGE_SZHUGE; } while (0)
59 static void set_huge_pte(struct mm_struct *mm, struct vm_area_struct *vma,
60 struct page *page, pte_t * page_table, int write_access)
65 add_mm_counter(mm, rss, HPAGE_SIZE / PAGE_SIZE);
68 entry = pte_mkwrite(pte_mkdirty(mk_pte(page,
71 entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot));
72 entry = pte_mkyoung(entry);
75 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
76 set_pte(page_table, entry);
79 pte_val(entry) += PAGE_SIZE;
83 pte_t huge_ptep_get_and_clear(pte_t *ptep)
89 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
98 * This function checks for proper alignment of input addr and len parameters.
100 int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
102 if (len & ~HPAGE_MASK)
104 if (addr & ~HPAGE_MASK)
109 int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
110 struct vm_area_struct *vma)
112 pte_t *src_pte, *dst_pte, entry;
113 struct page *ptepage;
114 unsigned long addr = vma->vm_start;
115 unsigned long end = vma->vm_end;
119 dst_pte = huge_pte_alloc(dst, addr);
122 src_pte = huge_pte_offset(src, addr);
123 BUG_ON(!src_pte || pte_none(*src_pte));
125 ptepage = pte_page(entry);
127 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
128 set_pte(dst_pte, entry);
129 pte_val(entry) += PAGE_SIZE;
132 add_mm_counter(dst, rss, HPAGE_SIZE / PAGE_SIZE);
141 int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
142 struct page **pages, struct vm_area_struct **vmas,
143 unsigned long *position, int *length, int i)
145 unsigned long vaddr = *position;
146 int remainder = *length;
148 WARN_ON(!is_vm_hugetlb_page(vma));
150 while (vaddr < vma->vm_end && remainder) {
155 pte = huge_pte_offset(mm, vaddr);
157 /* hugetlb should be locked, and hence, prefaulted */
158 BUG_ON(!pte || pte_none(*pte));
160 page = pte_page(*pte);
162 WARN_ON(!PageCompound(page));
182 struct page *follow_huge_addr(struct mm_struct *mm,
183 unsigned long address, int write)
185 return ERR_PTR(-EINVAL);
188 int pmd_huge(pmd_t pmd)
193 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
194 pmd_t *pmd, int write)
199 void unmap_hugepage_range(struct vm_area_struct *vma,
200 unsigned long start, unsigned long end)
202 struct mm_struct *mm = vma->vm_mm;
203 unsigned long address;
208 BUG_ON(start & (HPAGE_SIZE - 1));
209 BUG_ON(end & (HPAGE_SIZE - 1));
211 for (address = start; address < end; address += HPAGE_SIZE) {
212 pte = huge_pte_offset(mm, address);
216 page = pte_page(*pte);
218 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
219 pte_clear(mm, address+(i*PAGE_SIZE), pte);
223 add_mm_counter(mm, rss, -((end - start) >> PAGE_SHIFT));
224 flush_tlb_range(vma, start, end);
227 int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma)
229 struct mm_struct *mm = current->mm;
233 BUG_ON(vma->vm_start & ~HPAGE_MASK);
234 BUG_ON(vma->vm_end & ~HPAGE_MASK);
236 spin_lock(&mm->page_table_lock);
237 for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) {
239 pte_t *pte = huge_pte_alloc(mm, addr);
249 idx = ((addr - vma->vm_start) >> HPAGE_SHIFT)
250 + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
251 page = find_get_page(mapping, idx);
253 /* charge the fs quota first */
254 if (hugetlb_get_quota(mapping)) {
258 page = alloc_huge_page();
260 hugetlb_put_quota(mapping);
264 ret = add_to_page_cache(page, mapping, idx, GFP_ATOMIC);
268 hugetlb_put_quota(mapping);
269 free_huge_page(page);
273 set_huge_pte(mm, vma, page, pte, vma->vm_flags & VM_WRITE);
276 spin_unlock(&mm->page_table_lock);