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1da177e4 LT |
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/config.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/mm.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> | |
20 | #include <asm/mman.h> | |
21 | #include <asm/pgalloc.h> | |
22 | #include <asm/tlb.h> | |
23 | #include <asm/tlbflush.h> | |
24 | ||
25 | unsigned int hpage_shift=HPAGE_SHIFT_DEFAULT; | |
26 | ||
63551ae0 | 27 | pte_t * |
1da177e4 LT |
28 | huge_pte_alloc (struct mm_struct *mm, unsigned long addr) |
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 | ||
63551ae0 | 46 | pte_t * |
1da177e4 LT |
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 | ||
1da177e4 LT |
70 | /* |
71 | * This function checks for proper alignment of input addr and len parameters. | |
72 | */ | |
73 | int is_aligned_hugepage_range(unsigned long addr, unsigned long len) | |
74 | { | |
75 | if (len & ~HPAGE_MASK) | |
76 | return -EINVAL; | |
77 | if (addr & ~HPAGE_MASK) | |
78 | return -EINVAL; | |
79 | if (REGION_NUMBER(addr) != REGION_HPAGE) | |
80 | return -EINVAL; | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
1da177e4 LT |
85 | struct page *follow_huge_addr(struct mm_struct *mm, unsigned long addr, int write) |
86 | { | |
87 | struct page *page; | |
88 | pte_t *ptep; | |
89 | ||
90 | if (REGION_NUMBER(addr) != REGION_HPAGE) | |
91 | return ERR_PTR(-EINVAL); | |
92 | ||
93 | ptep = huge_pte_offset(mm, addr); | |
94 | if (!ptep || pte_none(*ptep)) | |
95 | return NULL; | |
96 | page = pte_page(*ptep); | |
97 | page += ((addr & ~HPAGE_MASK) >> PAGE_SHIFT); | |
98 | return page; | |
99 | } | |
100 | int pmd_huge(pmd_t pmd) | |
101 | { | |
102 | return 0; | |
103 | } | |
104 | struct page * | |
105 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd, int write) | |
106 | { | |
107 | return NULL; | |
108 | } | |
109 | ||
3bf5ee95 HD |
110 | void hugetlb_free_pgd_range(struct mmu_gather **tlb, |
111 | unsigned long addr, unsigned long end, | |
112 | unsigned long floor, unsigned long ceiling) | |
1da177e4 | 113 | { |
3bf5ee95 HD |
114 | /* |
115 | * This is called only when is_hugepage_only_range(addr,), | |
116 | * and it follows that is_hugepage_only_range(end,) also. | |
117 | * | |
118 | * The offset of these addresses from the base of the hugetlb | |
119 | * region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that | |
120 | * the standard free_pgd_range will free the right page tables. | |
121 | * | |
122 | * If floor and ceiling are also in the hugetlb region, they | |
123 | * must likewise be scaled down; but if outside, left unchanged. | |
124 | */ | |
125 | ||
126 | addr = htlbpage_to_page(addr); | |
127 | end = htlbpage_to_page(end); | |
128 | if (is_hugepage_only_range(tlb->mm, floor, HPAGE_SIZE)) | |
129 | floor = htlbpage_to_page(floor); | |
130 | if (is_hugepage_only_range(tlb->mm, ceiling, HPAGE_SIZE)) | |
131 | ceiling = htlbpage_to_page(ceiling); | |
132 | ||
133 | free_pgd_range(tlb, addr, end, floor, ceiling); | |
1da177e4 LT |
134 | } |
135 | ||
1da177e4 LT |
136 | unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, |
137 | unsigned long pgoff, unsigned long flags) | |
138 | { | |
139 | struct vm_area_struct *vmm; | |
140 | ||
141 | if (len > RGN_MAP_LIMIT) | |
142 | return -ENOMEM; | |
143 | if (len & ~HPAGE_MASK) | |
144 | return -EINVAL; | |
145 | /* This code assumes that REGION_HPAGE != 0. */ | |
146 | if ((REGION_NUMBER(addr) != REGION_HPAGE) || (addr & (HPAGE_SIZE - 1))) | |
147 | addr = HPAGE_REGION_BASE; | |
148 | else | |
149 | addr = ALIGN(addr, HPAGE_SIZE); | |
150 | for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { | |
151 | /* At this point: (!vmm || addr < vmm->vm_end). */ | |
152 | if (REGION_OFFSET(addr) + len > RGN_MAP_LIMIT) | |
153 | return -ENOMEM; | |
154 | if (!vmm || (addr + len) <= vmm->vm_start) | |
155 | return addr; | |
156 | addr = ALIGN(vmm->vm_end, HPAGE_SIZE); | |
157 | } | |
158 | } | |
159 | ||
160 | static int __init hugetlb_setup_sz(char *str) | |
161 | { | |
162 | u64 tr_pages; | |
163 | unsigned long long size; | |
164 | ||
165 | if (ia64_pal_vm_page_size(&tr_pages, NULL) != 0) | |
166 | /* | |
167 | * shouldn't happen, but just in case. | |
168 | */ | |
169 | tr_pages = 0x15557000UL; | |
170 | ||
171 | size = memparse(str, &str); | |
172 | if (*str || (size & (size-1)) || !(tr_pages & size) || | |
173 | size <= PAGE_SIZE || | |
174 | size >= (1UL << PAGE_SHIFT << MAX_ORDER)) { | |
175 | printk(KERN_WARNING "Invalid huge page size specified\n"); | |
176 | return 1; | |
177 | } | |
178 | ||
179 | hpage_shift = __ffs(size); | |
180 | /* | |
181 | * boot cpu already executed ia64_mmu_init, and has HPAGE_SHIFT_DEFAULT | |
182 | * override here with new page shift. | |
183 | */ | |
184 | ia64_set_rr(HPAGE_REGION_BASE, hpage_shift << 2); | |
185 | return 1; | |
186 | } | |
187 | __setup("hugepagesz=", hugetlb_setup_sz); |