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Linux/arch/sparc/mm/hugetlbpage.c

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  1 /*
  2  * SPARC64 Huge TLB page support.
  3  *
  4  * Copyright (C) 2002, 2003, 2006 David S. Miller (davem@davemloft.net)
  5  */
  6 
  7 #include <linux/fs.h>
  8 #include <linux/mm.h>
  9 #include <linux/hugetlb.h>
 10 #include <linux/pagemap.h>
 11 #include <linux/sysctl.h>
 12 
 13 #include <asm/mman.h>
 14 #include <asm/pgalloc.h>
 15 #include <asm/tlb.h>
 16 #include <asm/tlbflush.h>
 17 #include <asm/cacheflush.h>
 18 #include <asm/mmu_context.h>
 19 
 20 /* Slightly simplified from the non-hugepage variant because by
 21  * definition we don't have to worry about any page coloring stuff
 22  */
 23 
 24 static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
 25                                                         unsigned long addr,
 26                                                         unsigned long len,
 27                                                         unsigned long pgoff,
 28                                                         unsigned long flags)
 29 {
 30         unsigned long task_size = TASK_SIZE;
 31         struct vm_unmapped_area_info info;
 32 
 33         if (test_thread_flag(TIF_32BIT))
 34                 task_size = STACK_TOP32;
 35 
 36         info.flags = 0;
 37         info.length = len;
 38         info.low_limit = TASK_UNMAPPED_BASE;
 39         info.high_limit = min(task_size, VA_EXCLUDE_START);
 40         info.align_mask = PAGE_MASK & ~HPAGE_MASK;
 41         info.align_offset = 0;
 42         addr = vm_unmapped_area(&info);
 43 
 44         if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
 45                 VM_BUG_ON(addr != -ENOMEM);
 46                 info.low_limit = VA_EXCLUDE_END;
 47                 info.high_limit = task_size;
 48                 addr = vm_unmapped_area(&info);
 49         }
 50 
 51         return addr;
 52 }
 53 
 54 static unsigned long
 55 hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 56                                   const unsigned long len,
 57                                   const unsigned long pgoff,
 58                                   const unsigned long flags)
 59 {
 60         struct mm_struct *mm = current->mm;
 61         unsigned long addr = addr0;
 62         struct vm_unmapped_area_info info;
 63 
 64         /* This should only ever run for 32-bit processes.  */
 65         BUG_ON(!test_thread_flag(TIF_32BIT));
 66 
 67         info.flags = VM_UNMAPPED_AREA_TOPDOWN;
 68         info.length = len;
 69         info.low_limit = PAGE_SIZE;
 70         info.high_limit = mm->mmap_base;
 71         info.align_mask = PAGE_MASK & ~HPAGE_MASK;
 72         info.align_offset = 0;
 73         addr = vm_unmapped_area(&info);
 74 
 75         /*
 76          * A failed mmap() very likely causes application failure,
 77          * so fall back to the bottom-up function here. This scenario
 78          * can happen with large stack limits and large mmap()
 79          * allocations.
 80          */
 81         if (addr & ~PAGE_MASK) {
 82                 VM_BUG_ON(addr != -ENOMEM);
 83                 info.flags = 0;
 84                 info.low_limit = TASK_UNMAPPED_BASE;
 85                 info.high_limit = STACK_TOP32;
 86                 addr = vm_unmapped_area(&info);
 87         }
 88 
 89         return addr;
 90 }
 91 
 92 unsigned long
 93 hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 94                 unsigned long len, unsigned long pgoff, unsigned long flags)
 95 {
 96         struct mm_struct *mm = current->mm;
 97         struct vm_area_struct *vma;
 98         unsigned long task_size = TASK_SIZE;
 99 
100         if (test_thread_flag(TIF_32BIT))
101                 task_size = STACK_TOP32;
102 
103         if (len & ~HPAGE_MASK)
104                 return -EINVAL;
105         if (len > task_size)
106                 return -ENOMEM;
107 
108         if (flags & MAP_FIXED) {
109                 if (prepare_hugepage_range(file, addr, len))
110                         return -EINVAL;
111                 return addr;
112         }
113 
114         if (addr) {
115                 addr = ALIGN(addr, HPAGE_SIZE);
116                 vma = find_vma(mm, addr);
117                 if (task_size - len >= addr &&
118                     (!vma || addr + len <= vma->vm_start))
119                         return addr;
120         }
121         if (mm->get_unmapped_area == arch_get_unmapped_area)
122                 return hugetlb_get_unmapped_area_bottomup(file, addr, len,
123                                 pgoff, flags);
124         else
125                 return hugetlb_get_unmapped_area_topdown(file, addr, len,
126                                 pgoff, flags);
127 }
128 
129 pte_t *huge_pte_alloc(struct mm_struct *mm,
130                         unsigned long addr, unsigned long sz)
131 {
132         pgd_t *pgd;
133         pud_t *pud;
134         pmd_t *pmd;
135         pte_t *pte = NULL;
136 
137         /* We must align the address, because our caller will run
138          * set_huge_pte_at() on whatever we return, which writes out
139          * all of the sub-ptes for the hugepage range.  So we have
140          * to give it the first such sub-pte.
141          */
142         addr &= HPAGE_MASK;
143 
144         pgd = pgd_offset(mm, addr);
145         pud = pud_alloc(mm, pgd, addr);
146         if (pud) {
147                 pmd = pmd_alloc(mm, pud, addr);
148                 if (pmd)
149                         pte = pte_alloc_map(mm, NULL, pmd, addr);
150         }
151         return pte;
152 }
153 
154 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
155 {
156         pgd_t *pgd;
157         pud_t *pud;
158         pmd_t *pmd;
159         pte_t *pte = NULL;
160 
161         addr &= HPAGE_MASK;
162 
163         pgd = pgd_offset(mm, addr);
164         if (!pgd_none(*pgd)) {
165                 pud = pud_offset(pgd, addr);
166                 if (!pud_none(*pud)) {
167                         pmd = pmd_offset(pud, addr);
168                         if (!pmd_none(*pmd))
169                                 pte = pte_offset_map(pmd, addr);
170                 }
171         }
172         return pte;
173 }
174 
175 void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
176                      pte_t *ptep, pte_t entry)
177 {
178         int i;
179 
180         if (!pte_present(*ptep) && pte_present(entry))
181                 mm->context.huge_pte_count++;
182 
183         addr &= HPAGE_MASK;
184         for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
185                 set_pte_at(mm, addr, ptep, entry);
186                 ptep++;
187                 addr += PAGE_SIZE;
188                 pte_val(entry) += PAGE_SIZE;
189         }
190 }
191 
192 pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
193                               pte_t *ptep)
194 {
195         pte_t entry;
196         int i;
197 
198         entry = *ptep;
199         if (pte_present(entry))
200                 mm->context.huge_pte_count--;
201 
202         addr &= HPAGE_MASK;
203 
204         for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
205                 pte_clear(mm, addr, ptep);
206                 addr += PAGE_SIZE;
207                 ptep++;
208         }
209 
210         return entry;
211 }
212 
213 int pmd_huge(pmd_t pmd)
214 {
215         return 0;
216 }
217 
218 int pud_huge(pud_t pud)
219 {
220         return 0;
221 }
222 

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