2 * SPARC64 Huge TLB page support.
4 * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
7 #include <linux/config.h>
8 #include <linux/init.h>
9 #include <linux/module.h>
12 #include <linux/hugetlb.h>
13 #include <linux/pagemap.h>
14 #include <linux/smp_lock.h>
15 #include <linux/slab.h>
16 #include <linux/sysctl.h>
19 #include <asm/pgalloc.h>
21 #include <asm/tlbflush.h>
22 #include <asm/cacheflush.h>
24 static pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
30 pgd = pgd_offset(mm, addr);
32 pmd = pmd_alloc(mm, pgd, addr);
34 pte = pte_alloc_map(mm, pmd, addr);
39 static pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
45 pgd = pgd_offset(mm, addr);
47 pmd = pmd_offset(pgd, addr);
49 pte = pte_offset_map(pmd, addr);
54 #define mk_pte_huge(entry) do { pte_val(entry) |= _PAGE_SZHUGE; } while (0)
56 static void set_huge_pte(struct mm_struct *mm, struct vm_area_struct *vma,
57 struct page *page, pte_t * page_table, int write_access)
62 mm->rss += (HPAGE_SIZE / PAGE_SIZE);
65 entry = pte_mkwrite(pte_mkdirty(mk_pte(page,
68 entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot));
69 entry = pte_mkyoung(entry);
72 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
73 set_pte(page_table, entry);
76 pte_val(entry) += PAGE_SIZE;
81 * This function checks for proper alignment of input addr and len parameters.
83 int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
85 if (len & ~HPAGE_MASK)
87 if (addr & ~HPAGE_MASK)
92 int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
93 struct vm_area_struct *vma)
95 pte_t *src_pte, *dst_pte, entry;
97 unsigned long addr = vma->vm_start;
98 unsigned long end = vma->vm_end;
102 dst_pte = huge_pte_alloc(dst, addr);
105 src_pte = huge_pte_offset(src, addr);
106 BUG_ON(!src_pte || pte_none(*src_pte));
108 ptepage = pte_page(entry);
110 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
111 set_pte(dst_pte, entry);
112 pte_val(entry) += PAGE_SIZE;
115 dst->rss += (HPAGE_SIZE / PAGE_SIZE);
124 int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
125 struct page **pages, struct vm_area_struct **vmas,
126 unsigned long *position, int *length, int i)
128 unsigned long vaddr = *position;
129 int remainder = *length;
131 WARN_ON(!is_vm_hugetlb_page(vma));
133 while (vaddr < vma->vm_end && remainder) {
138 pte = huge_pte_offset(mm, vaddr);
140 /* hugetlb should be locked, and hence, prefaulted */
141 BUG_ON(!pte || pte_none(*pte));
143 page = pte_page(*pte);
145 WARN_ON(!PageCompound(page));
165 struct page *follow_huge_addr(struct mm_struct *mm,
166 unsigned long address, int write)
168 return ERR_PTR(-EINVAL);
171 int pmd_huge(pmd_t pmd)
176 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
177 pmd_t *pmd, int write)
182 void unmap_hugepage_range(struct vm_area_struct *vma,
183 unsigned long start, unsigned long end)
185 struct mm_struct *mm = vma->vm_mm;
186 unsigned long address;
191 BUG_ON(start & (HPAGE_SIZE - 1));
192 BUG_ON(end & (HPAGE_SIZE - 1));
194 for (address = start; address < end; address += HPAGE_SIZE) {
195 pte = huge_pte_offset(mm, address);
199 page = pte_page(*pte);
201 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
206 mm->rss -= (end - start) >> PAGE_SHIFT;
207 flush_tlb_range(vma, start, end);
210 int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma)
212 struct mm_struct *mm = current->mm;
216 BUG_ON(vma->vm_start & ~HPAGE_MASK);
217 BUG_ON(vma->vm_end & ~HPAGE_MASK);
219 spin_lock(&mm->page_table_lock);
220 for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) {
222 pte_t *pte = huge_pte_alloc(mm, addr);
232 idx = ((addr - vma->vm_start) >> HPAGE_SHIFT)
233 + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
234 page = find_get_page(mapping, idx);
236 /* charge the fs quota first */
237 if (hugetlb_get_quota(mapping)) {
241 page = alloc_huge_page();
243 hugetlb_put_quota(mapping);
247 ret = add_to_page_cache(page, mapping, idx, GFP_ATOMIC);
251 hugetlb_put_quota(mapping);
252 free_huge_page(page);
256 set_huge_pte(mm, vma, page, pte, vma->vm_flags & VM_WRITE);
259 spin_unlock(&mm->page_table_lock);