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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * IA-64 Huge TLB Page Support for Kernel. | |
4 | * | |
5 | * Copyright (C) 2002-2004 Rohit Seth <rohit.seth@intel.com> | |
6 | * Copyright (C) 2003-2004 Ken Chen <kenneth.w.chen@intel.com> | |
7 | * | |
8 | * Sep, 2003: add numa support | |
9 | * Feb, 2004: dynamic hugetlb page size via boot parameter | |
10 | */ | |
11 | ||
1da177e4 LT |
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> | |
34d8a380 | 17 | #include <linux/module.h> |
1da177e4 | 18 | #include <linux/sysctl.h> |
9be26f4c | 19 | #include <linux/log2.h> |
1da177e4 LT |
20 | #include <asm/mman.h> |
21 | #include <asm/pgalloc.h> | |
22 | #include <asm/tlb.h> | |
23 | #include <asm/tlbflush.h> | |
24 | ||
34d8a380 JS |
25 | unsigned int hpage_shift = HPAGE_SHIFT_DEFAULT; |
26 | EXPORT_SYMBOL(hpage_shift); | |
1da177e4 | 27 | |
63551ae0 | 28 | pte_t * |
a5516438 | 29 | huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz) |
1da177e4 LT |
30 | { |
31 | unsigned long taddr = htlbpage_to_page(addr); | |
32 | pgd_t *pgd; | |
33 | pud_t *pud; | |
34 | pmd_t *pmd; | |
35 | pte_t *pte = NULL; | |
36 | ||
37 | pgd = pgd_offset(mm, taddr); | |
38 | pud = pud_alloc(mm, pgd, taddr); | |
39 | if (pud) { | |
40 | pmd = pmd_alloc(mm, pud, taddr); | |
41 | if (pmd) | |
3ed3a4f0 | 42 | pte = pte_alloc_map(mm, pmd, taddr); |
1da177e4 LT |
43 | } |
44 | return pte; | |
45 | } | |
46 | ||
63551ae0 | 47 | pte_t * |
7868a208 | 48 | huge_pte_offset (struct mm_struct *mm, unsigned long addr, unsigned long sz) |
1da177e4 LT |
49 | { |
50 | unsigned long taddr = htlbpage_to_page(addr); | |
51 | pgd_t *pgd; | |
52 | pud_t *pud; | |
53 | pmd_t *pmd; | |
54 | pte_t *pte = NULL; | |
55 | ||
56 | pgd = pgd_offset(mm, taddr); | |
57 | if (pgd_present(*pgd)) { | |
58 | pud = pud_offset(pgd, taddr); | |
59 | if (pud_present(*pud)) { | |
60 | pmd = pmd_offset(pud, taddr); | |
61 | if (pmd_present(*pmd)) | |
62 | pte = pte_offset_map(pmd, taddr); | |
63 | } | |
64 | } | |
65 | ||
66 | return pte; | |
67 | } | |
68 | ||
69 | #define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; } | |
70 | ||
1da177e4 | 71 | /* |
42b88bef DG |
72 | * Don't actually need to do any preparation, but need to make sure |
73 | * the address is in the right region. | |
1da177e4 | 74 | */ |
a5516438 AK |
75 | int prepare_hugepage_range(struct file *file, |
76 | unsigned long addr, unsigned long len) | |
1da177e4 LT |
77 | { |
78 | if (len & ~HPAGE_MASK) | |
79 | return -EINVAL; | |
80 | if (addr & ~HPAGE_MASK) | |
81 | return -EINVAL; | |
0a41e250 | 82 | if (REGION_NUMBER(addr) != RGN_HPAGE) |
1da177e4 LT |
83 | return -EINVAL; |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
1da177e4 LT |
88 | struct page *follow_huge_addr(struct mm_struct *mm, unsigned long addr, int write) |
89 | { | |
90 | struct page *page; | |
91 | pte_t *ptep; | |
92 | ||
0a41e250 | 93 | if (REGION_NUMBER(addr) != RGN_HPAGE) |
1da177e4 LT |
94 | return ERR_PTR(-EINVAL); |
95 | ||
7868a208 | 96 | ptep = huge_pte_offset(mm, addr, HPAGE_SIZE); |
1da177e4 LT |
97 | if (!ptep || pte_none(*ptep)) |
98 | return NULL; | |
99 | page = pte_page(*ptep); | |
100 | page += ((addr & ~HPAGE_MASK) >> PAGE_SHIFT); | |
101 | return page; | |
102 | } | |
103 | int pmd_huge(pmd_t pmd) | |
104 | { | |
105 | return 0; | |
106 | } | |
ceb86879 AK |
107 | |
108 | int pud_huge(pud_t pud) | |
109 | { | |
110 | return 0; | |
111 | } | |
112 | ||
42b77728 | 113 | void hugetlb_free_pgd_range(struct mmu_gather *tlb, |
3bf5ee95 HD |
114 | unsigned long addr, unsigned long end, |
115 | unsigned long floor, unsigned long ceiling) | |
1da177e4 | 116 | { |
3bf5ee95 | 117 | /* |
2332c9ae | 118 | * This is called to free hugetlb page tables. |
3bf5ee95 HD |
119 | * |
120 | * The offset of these addresses from the base of the hugetlb | |
121 | * region must be scaled down by HPAGE_SIZE/PAGE_SIZE so that | |
122 | * the standard free_pgd_range will free the right page tables. | |
123 | * | |
124 | * If floor and ceiling are also in the hugetlb region, they | |
125 | * must likewise be scaled down; but if outside, left unchanged. | |
126 | */ | |
127 | ||
128 | addr = htlbpage_to_page(addr); | |
129 | end = htlbpage_to_page(end); | |
2332c9ae | 130 | if (REGION_NUMBER(floor) == RGN_HPAGE) |
3bf5ee95 | 131 | floor = htlbpage_to_page(floor); |
2332c9ae | 132 | if (REGION_NUMBER(ceiling) == RGN_HPAGE) |
3bf5ee95 HD |
133 | ceiling = htlbpage_to_page(ceiling); |
134 | ||
135 | free_pgd_range(tlb, addr, end, floor, ceiling); | |
1da177e4 LT |
136 | } |
137 | ||
1da177e4 LT |
138 | unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, |
139 | unsigned long pgoff, unsigned long flags) | |
140 | { | |
e31048af | 141 | struct vm_unmapped_area_info info; |
1da177e4 LT |
142 | |
143 | if (len > RGN_MAP_LIMIT) | |
144 | return -ENOMEM; | |
145 | if (len & ~HPAGE_MASK) | |
146 | return -EINVAL; | |
afa37394 BH |
147 | |
148 | /* Handle MAP_FIXED */ | |
149 | if (flags & MAP_FIXED) { | |
a5516438 | 150 | if (prepare_hugepage_range(file, addr, len)) |
afa37394 BH |
151 | return -EINVAL; |
152 | return addr; | |
153 | } | |
154 | ||
0a41e250 PC |
155 | /* This code assumes that RGN_HPAGE != 0. */ |
156 | if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1))) | |
1da177e4 | 157 | addr = HPAGE_REGION_BASE; |
e31048af ML |
158 | |
159 | info.flags = 0; | |
160 | info.length = len; | |
161 | info.low_limit = addr; | |
162 | info.high_limit = HPAGE_REGION_BASE + RGN_MAP_LIMIT; | |
163 | info.align_mask = PAGE_MASK & (HPAGE_SIZE - 1); | |
164 | info.align_offset = 0; | |
165 | return vm_unmapped_area(&info); | |
1da177e4 LT |
166 | } |
167 | ||
168 | static int __init hugetlb_setup_sz(char *str) | |
169 | { | |
170 | u64 tr_pages; | |
171 | unsigned long long size; | |
172 | ||
173 | if (ia64_pal_vm_page_size(&tr_pages, NULL) != 0) | |
174 | /* | |
175 | * shouldn't happen, but just in case. | |
176 | */ | |
177 | tr_pages = 0x15557000UL; | |
178 | ||
179 | size = memparse(str, &str); | |
9be26f4c | 180 | if (*str || !is_power_of_2(size) || !(tr_pages & size) || |
1da177e4 LT |
181 | size <= PAGE_SIZE || |
182 | size >= (1UL << PAGE_SHIFT << MAX_ORDER)) { | |
183 | printk(KERN_WARNING "Invalid huge page size specified\n"); | |
184 | return 1; | |
185 | } | |
186 | ||
187 | hpage_shift = __ffs(size); | |
188 | /* | |
189 | * boot cpu already executed ia64_mmu_init, and has HPAGE_SHIFT_DEFAULT | |
190 | * override here with new page shift. | |
191 | */ | |
192 | ia64_set_rr(HPAGE_REGION_BASE, hpage_shift << 2); | |
d9c23400 | 193 | return 0; |
1da177e4 | 194 | } |
d9c23400 | 195 | early_param("hugepagesz", hugetlb_setup_sz); |