Commit | Line | Data |
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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 | ||
1da177e4 LT |
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> | |
34d8a380 | 16 | #include <linux/module.h> |
1da177e4 | 17 | #include <linux/sysctl.h> |
9be26f4c | 18 | #include <linux/log2.h> |
1da177e4 LT |
19 | #include <asm/mman.h> |
20 | #include <asm/pgalloc.h> | |
21 | #include <asm/tlb.h> | |
22 | #include <asm/tlbflush.h> | |
23 | ||
34d8a380 JS |
24 | unsigned int hpage_shift = HPAGE_SHIFT_DEFAULT; |
25 | EXPORT_SYMBOL(hpage_shift); | |
1da177e4 | 26 | |
63551ae0 | 27 | pte_t * |
a5516438 | 28 | huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz) |
1da177e4 LT |
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) | |
8ac1f832 | 41 | pte = pte_alloc_map(mm, NULL, pmd, taddr); |
1da177e4 LT |
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 | ||
39dde65c CK |
68 | int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) |
69 | { | |
70 | return 0; | |
71 | } | |
72 | ||
1da177e4 LT |
73 | #define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; } |
74 | ||
1da177e4 | 75 | /* |
42b88bef DG |
76 | * Don't actually need to do any preparation, but need to make sure |
77 | * the address is in the right region. | |
1da177e4 | 78 | */ |
a5516438 AK |
79 | int prepare_hugepage_range(struct file *file, |
80 | unsigned long addr, unsigned long len) | |
1da177e4 LT |
81 | { |
82 | if (len & ~HPAGE_MASK) | |
83 | return -EINVAL; | |
84 | if (addr & ~HPAGE_MASK) | |
85 | return -EINVAL; | |
0a41e250 | 86 | if (REGION_NUMBER(addr) != RGN_HPAGE) |
1da177e4 LT |
87 | return -EINVAL; |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
1da177e4 LT |
92 | struct page *follow_huge_addr(struct mm_struct *mm, unsigned long addr, int write) |
93 | { | |
94 | struct page *page; | |
95 | pte_t *ptep; | |
96 | ||
0a41e250 | 97 | if (REGION_NUMBER(addr) != RGN_HPAGE) |
1da177e4 LT |
98 | return ERR_PTR(-EINVAL); |
99 | ||
100 | ptep = huge_pte_offset(mm, addr); | |
101 | if (!ptep || pte_none(*ptep)) | |
102 | return NULL; | |
103 | page = pte_page(*ptep); | |
104 | page += ((addr & ~HPAGE_MASK) >> PAGE_SHIFT); | |
105 | return page; | |
106 | } | |
107 | int pmd_huge(pmd_t pmd) | |
108 | { | |
109 | return 0; | |
110 | } | |
ceb86879 AK |
111 | |
112 | int pud_huge(pud_t pud) | |
113 | { | |
114 | return 0; | |
115 | } | |
116 | ||
1da177e4 LT |
117 | struct page * |
118 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd, int write) | |
119 | { | |
120 | return NULL; | |
121 | } | |
122 | ||
42b77728 | 123 | void hugetlb_free_pgd_range(struct mmu_gather *tlb, |
3bf5ee95 HD |
124 | unsigned long addr, unsigned long end, |
125 | unsigned long floor, unsigned long ceiling) | |
1da177e4 | 126 | { |
3bf5ee95 | 127 | /* |
2332c9ae | 128 | * This is called to free hugetlb page tables. |
3bf5ee95 HD |
129 | * |
130 | * The offset of these addresses from the base of the hugetlb | |
131 | * region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that | |
132 | * the standard free_pgd_range will free the right page tables. | |
133 | * | |
134 | * If floor and ceiling are also in the hugetlb region, they | |
135 | * must likewise be scaled down; but if outside, left unchanged. | |
136 | */ | |
137 | ||
138 | addr = htlbpage_to_page(addr); | |
139 | end = htlbpage_to_page(end); | |
2332c9ae | 140 | if (REGION_NUMBER(floor) == RGN_HPAGE) |
3bf5ee95 | 141 | floor = htlbpage_to_page(floor); |
2332c9ae | 142 | if (REGION_NUMBER(ceiling) == RGN_HPAGE) |
3bf5ee95 HD |
143 | ceiling = htlbpage_to_page(ceiling); |
144 | ||
145 | free_pgd_range(tlb, addr, end, floor, ceiling); | |
1da177e4 LT |
146 | } |
147 | ||
1da177e4 LT |
148 | unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, |
149 | unsigned long pgoff, unsigned long flags) | |
150 | { | |
151 | struct vm_area_struct *vmm; | |
152 | ||
153 | if (len > RGN_MAP_LIMIT) | |
154 | return -ENOMEM; | |
155 | if (len & ~HPAGE_MASK) | |
156 | return -EINVAL; | |
afa37394 BH |
157 | |
158 | /* Handle MAP_FIXED */ | |
159 | if (flags & MAP_FIXED) { | |
a5516438 | 160 | if (prepare_hugepage_range(file, addr, len)) |
afa37394 BH |
161 | return -EINVAL; |
162 | return addr; | |
163 | } | |
164 | ||
0a41e250 PC |
165 | /* This code assumes that RGN_HPAGE != 0. */ |
166 | if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1))) | |
1da177e4 LT |
167 | addr = HPAGE_REGION_BASE; |
168 | else | |
169 | addr = ALIGN(addr, HPAGE_SIZE); | |
170 | for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { | |
171 | /* At this point: (!vmm || addr < vmm->vm_end). */ | |
172 | if (REGION_OFFSET(addr) + len > RGN_MAP_LIMIT) | |
173 | return -ENOMEM; | |
174 | if (!vmm || (addr + len) <= vmm->vm_start) | |
175 | return addr; | |
176 | addr = ALIGN(vmm->vm_end, HPAGE_SIZE); | |
177 | } | |
178 | } | |
179 | ||
180 | static int __init hugetlb_setup_sz(char *str) | |
181 | { | |
182 | u64 tr_pages; | |
183 | unsigned long long size; | |
184 | ||
185 | if (ia64_pal_vm_page_size(&tr_pages, NULL) != 0) | |
186 | /* | |
187 | * shouldn't happen, but just in case. | |
188 | */ | |
189 | tr_pages = 0x15557000UL; | |
190 | ||
191 | size = memparse(str, &str); | |
9be26f4c | 192 | if (*str || !is_power_of_2(size) || !(tr_pages & size) || |
1da177e4 LT |
193 | size <= PAGE_SIZE || |
194 | size >= (1UL << PAGE_SHIFT << MAX_ORDER)) { | |
195 | printk(KERN_WARNING "Invalid huge page size specified\n"); | |
196 | return 1; | |
197 | } | |
198 | ||
199 | hpage_shift = __ffs(size); | |
200 | /* | |
201 | * boot cpu already executed ia64_mmu_init, and has HPAGE_SHIFT_DEFAULT | |
202 | * override here with new page shift. | |
203 | */ | |
204 | ia64_set_rr(HPAGE_REGION_BASE, hpage_shift << 2); | |
d9c23400 | 205 | return 0; |
1da177e4 | 206 | } |
d9c23400 | 207 | early_param("hugepagesz", hugetlb_setup_sz); |