2 * SPARC64 Huge TLB page support.
4 * Copyright (C) 2002, 2003, 2006 David S. Miller (davem@davemloft.net)
9 #include <linux/hugetlb.h>
10 #include <linux/pagemap.h>
11 #include <linux/sysctl.h>
14 #include <asm/pgalloc.h>
15 #include <asm/pgtable.h>
17 #include <asm/tlbflush.h>
18 #include <asm/cacheflush.h>
19 #include <asm/mmu_context.h>
21 /* Slightly simplified from the non-hugepage variant because by
22 * definition we don't have to worry about any page coloring stuff
25 static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
31 unsigned long task_size = TASK_SIZE;
32 struct vm_unmapped_area_info info;
34 if (test_thread_flag(TIF_32BIT))
35 task_size = STACK_TOP32;
39 info.low_limit = TASK_UNMAPPED_BASE;
40 info.high_limit = min(task_size, VA_EXCLUDE_START);
41 info.align_mask = PAGE_MASK & ~HPAGE_MASK;
42 info.align_offset = 0;
43 addr = vm_unmapped_area(&info);
45 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
46 VM_BUG_ON(addr != -ENOMEM);
47 info.low_limit = VA_EXCLUDE_END;
48 info.high_limit = task_size;
49 addr = vm_unmapped_area(&info);
56 hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
57 const unsigned long len,
58 const unsigned long pgoff,
59 const unsigned long flags)
61 struct mm_struct *mm = current->mm;
62 unsigned long addr = addr0;
63 struct vm_unmapped_area_info info;
65 /* This should only ever run for 32-bit processes. */
66 BUG_ON(!test_thread_flag(TIF_32BIT));
68 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
70 info.low_limit = PAGE_SIZE;
71 info.high_limit = mm->mmap_base;
72 info.align_mask = PAGE_MASK & ~HPAGE_MASK;
73 info.align_offset = 0;
74 addr = vm_unmapped_area(&info);
77 * A failed mmap() very likely causes application failure,
78 * so fall back to the bottom-up function here. This scenario
79 * can happen with large stack limits and large mmap()
82 if (addr & ~PAGE_MASK) {
83 VM_BUG_ON(addr != -ENOMEM);
85 info.low_limit = TASK_UNMAPPED_BASE;
86 info.high_limit = STACK_TOP32;
87 addr = vm_unmapped_area(&info);
94 hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
95 unsigned long len, unsigned long pgoff, unsigned long flags)
97 struct mm_struct *mm = current->mm;
98 struct vm_area_struct *vma;
99 unsigned long task_size = TASK_SIZE;
101 if (test_thread_flag(TIF_32BIT))
102 task_size = STACK_TOP32;
104 if (len & ~HPAGE_MASK)
109 if (flags & MAP_FIXED) {
110 if (prepare_hugepage_range(file, addr, len))
116 addr = ALIGN(addr, HPAGE_SIZE);
117 vma = find_vma(mm, addr);
118 if (task_size - len >= addr &&
119 (!vma || addr + len <= vma->vm_start))
122 if (mm->get_unmapped_area == arch_get_unmapped_area)
123 return hugetlb_get_unmapped_area_bottomup(file, addr, len,
126 return hugetlb_get_unmapped_area_topdown(file, addr, len,
130 pte_t *huge_pte_alloc(struct mm_struct *mm,
131 unsigned long addr, unsigned long sz)
137 pgd = pgd_offset(mm, addr);
138 pud = pud_alloc(mm, pgd, addr);
140 pte = (pte_t *)pmd_alloc(mm, pud, addr);
145 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
151 pgd = pgd_offset(mm, addr);
152 if (!pgd_none(*pgd)) {
153 pud = pud_offset(pgd, addr);
155 pte = (pte_t *)pmd_offset(pud, addr);
160 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
161 pte_t *ptep, pte_t entry)
165 if (!pte_present(*ptep) && pte_present(entry))
166 mm->context.hugetlb_pte_count++;
172 /* Issue TLB flush at REAL_HPAGE_SIZE boundaries */
173 maybe_tlb_batch_add(mm, addr, ptep, orig, 0);
174 maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, orig, 0);
177 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
183 if (pte_present(entry))
184 mm->context.hugetlb_pte_count--;
189 /* Issue TLB flush at REAL_HPAGE_SIZE boundaries */
190 maybe_tlb_batch_add(mm, addr, ptep, entry, 0);
191 maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, entry, 0);
196 int pmd_huge(pmd_t pmd)
198 return !pmd_none(pmd) &&
199 (pmd_val(pmd) & (_PAGE_VALID|_PAGE_PMD_HUGE)) != _PAGE_VALID;
202 int pud_huge(pud_t pud)
207 static void hugetlb_free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
210 pgtable_t token = pmd_pgtable(*pmd);
213 pte_free_tlb(tlb, token, addr);
214 atomic_long_dec(&tlb->mm->nr_ptes);
217 static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
218 unsigned long addr, unsigned long end,
219 unsigned long floor, unsigned long ceiling)
226 pmd = pmd_offset(pud, addr);
228 next = pmd_addr_end(addr, end);
231 if (is_hugetlb_pmd(*pmd))
234 hugetlb_free_pte_range(tlb, pmd, addr);
235 } while (pmd++, addr = next, addr != end);
245 if (end - 1 > ceiling - 1)
248 pmd = pmd_offset(pud, start);
250 pmd_free_tlb(tlb, pmd, start);
251 mm_dec_nr_pmds(tlb->mm);
254 static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
255 unsigned long addr, unsigned long end,
256 unsigned long floor, unsigned long ceiling)
263 pud = pud_offset(pgd, addr);
265 next = pud_addr_end(addr, end);
266 if (pud_none_or_clear_bad(pud))
268 hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
270 } while (pud++, addr = next, addr != end);
276 ceiling &= PGDIR_MASK;
280 if (end - 1 > ceiling - 1)
283 pud = pud_offset(pgd, start);
285 pud_free_tlb(tlb, pud, start);
288 void hugetlb_free_pgd_range(struct mmu_gather *tlb,
289 unsigned long addr, unsigned long end,
290 unsigned long floor, unsigned long ceiling)
295 pgd = pgd_offset(tlb->mm, addr);
297 next = pgd_addr_end(addr, end);
298 if (pgd_none_or_clear_bad(pgd))
300 hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling);
301 } while (pgd++, addr = next, addr != end);