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Linux/arch/ia64/mm/hugetlbpage.c

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  1 /*
  2  * IA-64 Huge TLB Page Support for Kernel.
  3  *
  4  * Copyright (C) 2002-2004 Rohit Seth <rohit.seth@intel.com>
  5  * Copyright (C) 2003-2004 Ken Chen <kenneth.w.chen@intel.com>
  6  *
  7  * Sep, 2003: add numa support
  8  * Feb, 2004: dynamic hugetlb page size via boot parameter
  9  */
 10 
 11 #include <linux/init.h>
 12 #include <linux/fs.h>
 13 #include <linux/mm.h>
 14 #include <linux/hugetlb.h>
 15 #include <linux/pagemap.h>
 16 #include <linux/module.h>
 17 #include <linux/sysctl.h>
 18 #include <linux/log2.h>
 19 #include <asm/mman.h>
 20 #include <asm/pgalloc.h>
 21 #include <asm/tlb.h>
 22 #include <asm/tlbflush.h>
 23 
 24 unsigned int hpage_shift = HPAGE_SHIFT_DEFAULT;
 25 EXPORT_SYMBOL(hpage_shift);
 26 
 27 pte_t *
 28 huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz)
 29 {
 30         unsigned long taddr = htlbpage_to_page(addr);
 31         pgd_t *pgd;
 32         pud_t *pud;
 33         pmd_t *pmd;
 34         pte_t *pte = NULL;
 35 
 36         pgd = pgd_offset(mm, taddr);
 37         pud = pud_alloc(mm, pgd, taddr);
 38         if (pud) {
 39                 pmd = pmd_alloc(mm, pud, taddr);
 40                 if (pmd)
 41                         pte = pte_alloc_map(mm, pmd, taddr);
 42         }
 43         return pte;
 44 }
 45 
 46 pte_t *
 47 huge_pte_offset (struct mm_struct *mm, unsigned long addr)
 48 {
 49         unsigned long taddr = htlbpage_to_page(addr);
 50         pgd_t *pgd;
 51         pud_t *pud;
 52         pmd_t *pmd;
 53         pte_t *pte = NULL;
 54 
 55         pgd = pgd_offset(mm, taddr);
 56         if (pgd_present(*pgd)) {
 57                 pud = pud_offset(pgd, taddr);
 58                 if (pud_present(*pud)) {
 59                         pmd = pmd_offset(pud, taddr);
 60                         if (pmd_present(*pmd))
 61                                 pte = pte_offset_map(pmd, taddr);
 62                 }
 63         }
 64 
 65         return pte;
 66 }
 67 
 68 #define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; }
 69 
 70 /*
 71  * Don't actually need to do any preparation, but need to make sure
 72  * the address is in the right region.
 73  */
 74 int prepare_hugepage_range(struct file *file,
 75                         unsigned long addr, unsigned long len)
 76 {
 77         if (len & ~HPAGE_MASK)
 78                 return -EINVAL;
 79         if (addr & ~HPAGE_MASK)
 80                 return -EINVAL;
 81         if (REGION_NUMBER(addr) != RGN_HPAGE)
 82                 return -EINVAL;
 83 
 84         return 0;
 85 }
 86 
 87 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long addr, int write)
 88 {
 89         struct page *page;
 90         pte_t *ptep;
 91 
 92         if (REGION_NUMBER(addr) != RGN_HPAGE)
 93                 return ERR_PTR(-EINVAL);
 94 
 95         ptep = huge_pte_offset(mm, addr);
 96         if (!ptep || pte_none(*ptep))
 97                 return NULL;
 98         page = pte_page(*ptep);
 99         page += ((addr & ~HPAGE_MASK) >> PAGE_SHIFT);
100         return page;
101 }
102 int pmd_huge(pmd_t pmd)
103 {
104         return 0;
105 }
106 
107 int pud_huge(pud_t pud)
108 {
109         return 0;
110 }
111 
112 void hugetlb_free_pgd_range(struct mmu_gather *tlb,
113                         unsigned long addr, unsigned long end,
114                         unsigned long floor, unsigned long ceiling)
115 {
116         /*
117          * This is called to free hugetlb page tables.
118          *
119          * The offset of these addresses from the base of the hugetlb
120          * region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that
121          * the standard free_pgd_range will free the right page tables.
122          *
123          * If floor and ceiling are also in the hugetlb region, they
124          * must likewise be scaled down; but if outside, left unchanged.
125          */
126 
127         addr = htlbpage_to_page(addr);
128         end  = htlbpage_to_page(end);
129         if (REGION_NUMBER(floor) == RGN_HPAGE)
130                 floor = htlbpage_to_page(floor);
131         if (REGION_NUMBER(ceiling) == RGN_HPAGE)
132                 ceiling = htlbpage_to_page(ceiling);
133 
134         free_pgd_range(tlb, addr, end, floor, ceiling);
135 }
136 
137 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
138                 unsigned long pgoff, unsigned long flags)
139 {
140         struct vm_unmapped_area_info info;
141 
142         if (len > RGN_MAP_LIMIT)
143                 return -ENOMEM;
144         if (len & ~HPAGE_MASK)
145                 return -EINVAL;
146 
147         /* Handle MAP_FIXED */
148         if (flags & MAP_FIXED) {
149                 if (prepare_hugepage_range(file, addr, len))
150                         return -EINVAL;
151                 return addr;
152         }
153 
154         /* This code assumes that RGN_HPAGE != 0. */
155         if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1)))
156                 addr = HPAGE_REGION_BASE;
157 
158         info.flags = 0;
159         info.length = len;
160         info.low_limit = addr;
161         info.high_limit = HPAGE_REGION_BASE + RGN_MAP_LIMIT;
162         info.align_mask = PAGE_MASK & (HPAGE_SIZE - 1);
163         info.align_offset = 0;
164         return vm_unmapped_area(&info);
165 }
166 
167 static int __init hugetlb_setup_sz(char *str)
168 {
169         u64 tr_pages;
170         unsigned long long size;
171 
172         if (ia64_pal_vm_page_size(&tr_pages, NULL) != 0)
173                 /*
174                  * shouldn't happen, but just in case.
175                  */
176                 tr_pages = 0x15557000UL;
177 
178         size = memparse(str, &str);
179         if (*str || !is_power_of_2(size) || !(tr_pages & size) ||
180                 size <= PAGE_SIZE ||
181                 size >= (1UL << PAGE_SHIFT << MAX_ORDER)) {
182                 printk(KERN_WARNING "Invalid huge page size specified\n");
183                 return 1;
184         }
185 
186         hpage_shift = __ffs(size);
187         /*
188          * boot cpu already executed ia64_mmu_init, and has HPAGE_SHIFT_DEFAULT
189          * override here with new page shift.
190          */
191         ia64_set_rr(HPAGE_REGION_BASE, hpage_shift << 2);
192         return 0;
193 }
194 early_param("hugepagesz", hugetlb_setup_sz);
195 

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