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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IA-32 Huge TLB Page Support for Kernel. | |
3 | * | |
4 | * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com> | |
5 | */ | |
6 | ||
1da177e4 LT |
7 | #include <linux/init.h> |
8 | #include <linux/fs.h> | |
9 | #include <linux/mm.h> | |
10 | #include <linux/hugetlb.h> | |
11 | #include <linux/pagemap.h> | |
1da177e4 LT |
12 | #include <linux/err.h> |
13 | #include <linux/sysctl.h> | |
14 | #include <asm/mman.h> | |
15 | #include <asm/tlb.h> | |
16 | #include <asm/tlbflush.h> | |
a5a19c63 | 17 | #include <asm/pgalloc.h> |
1da177e4 | 18 | |
1da177e4 LT |
19 | #if 0 /* This is just for testing */ |
20 | struct page * | |
21 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) | |
22 | { | |
23 | unsigned long start = address; | |
24 | int length = 1; | |
25 | int nr; | |
26 | struct page *page; | |
27 | struct vm_area_struct *vma; | |
28 | ||
29 | vma = find_vma(mm, addr); | |
30 | if (!vma || !is_vm_hugetlb_page(vma)) | |
31 | return ERR_PTR(-EINVAL); | |
32 | ||
33 | pte = huge_pte_offset(mm, address); | |
34 | ||
35 | /* hugetlb should be locked, and hence, prefaulted */ | |
36 | WARN_ON(!pte || pte_none(*pte)); | |
37 | ||
38 | page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)]; | |
39 | ||
25e59881 | 40 | WARN_ON(!PageHead(page)); |
1da177e4 LT |
41 | |
42 | return page; | |
43 | } | |
44 | ||
45 | int pmd_huge(pmd_t pmd) | |
46 | { | |
47 | return 0; | |
48 | } | |
49 | ||
ceb86879 AK |
50 | int pud_huge(pud_t pud) |
51 | { | |
52 | return 0; | |
53 | } | |
54 | ||
1da177e4 LT |
55 | #else |
56 | ||
cbef8478 NH |
57 | /* |
58 | * pmd_huge() returns 1 if @pmd is hugetlb related entry, that is normal | |
59 | * hugetlb entry or non-present (migration or hwpoisoned) hugetlb entry. | |
60 | * Otherwise, returns 0. | |
61 | */ | |
1da177e4 LT |
62 | int pmd_huge(pmd_t pmd) |
63 | { | |
cbef8478 NH |
64 | return !pmd_none(pmd) && |
65 | (pmd_val(pmd) & (_PAGE_PRESENT|_PAGE_PSE)) != _PAGE_PRESENT; | |
1da177e4 LT |
66 | } |
67 | ||
ceb86879 AK |
68 | int pud_huge(pud_t pud) |
69 | { | |
39c11e6c | 70 | return !!(pud_val(pud) & _PAGE_PSE); |
ceb86879 | 71 | } |
1da177e4 LT |
72 | #endif |
73 | ||
fd8526ad | 74 | #ifdef CONFIG_HUGETLB_PAGE |
1da177e4 LT |
75 | static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file, |
76 | unsigned long addr, unsigned long len, | |
77 | unsigned long pgoff, unsigned long flags) | |
78 | { | |
39c11e6c | 79 | struct hstate *h = hstate_file(file); |
cdc17344 ML |
80 | struct vm_unmapped_area_info info; |
81 | ||
82 | info.flags = 0; | |
83 | info.length = len; | |
fd8526ad | 84 | info.low_limit = current->mm->mmap_legacy_base; |
cdc17344 ML |
85 | info.high_limit = TASK_SIZE; |
86 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); | |
87 | info.align_offset = 0; | |
88 | return vm_unmapped_area(&info); | |
1da177e4 LT |
89 | } |
90 | ||
91 | static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file, | |
92 | unsigned long addr0, unsigned long len, | |
93 | unsigned long pgoff, unsigned long flags) | |
94 | { | |
39c11e6c | 95 | struct hstate *h = hstate_file(file); |
cdc17344 ML |
96 | struct vm_unmapped_area_info info; |
97 | unsigned long addr; | |
1da177e4 | 98 | |
cdc17344 ML |
99 | info.flags = VM_UNMAPPED_AREA_TOPDOWN; |
100 | info.length = len; | |
101 | info.low_limit = PAGE_SIZE; | |
102 | info.high_limit = current->mm->mmap_base; | |
103 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); | |
104 | info.align_offset = 0; | |
105 | addr = vm_unmapped_area(&info); | |
1da177e4 | 106 | |
1da177e4 LT |
107 | /* |
108 | * A failed mmap() very likely causes application failure, | |
109 | * so fall back to the bottom-up function here. This scenario | |
110 | * can happen with large stack limits and large mmap() | |
111 | * allocations. | |
112 | */ | |
cdc17344 ML |
113 | if (addr & ~PAGE_MASK) { |
114 | VM_BUG_ON(addr != -ENOMEM); | |
115 | info.flags = 0; | |
116 | info.low_limit = TASK_UNMAPPED_BASE; | |
117 | info.high_limit = TASK_SIZE; | |
118 | addr = vm_unmapped_area(&info); | |
119 | } | |
1da177e4 LT |
120 | |
121 | return addr; | |
122 | } | |
123 | ||
124 | unsigned long | |
125 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
126 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
127 | { | |
39c11e6c | 128 | struct hstate *h = hstate_file(file); |
1da177e4 LT |
129 | struct mm_struct *mm = current->mm; |
130 | struct vm_area_struct *vma; | |
131 | ||
39c11e6c | 132 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
133 | return -EINVAL; |
134 | if (len > TASK_SIZE) | |
135 | return -ENOMEM; | |
136 | ||
5a8130f2 | 137 | if (flags & MAP_FIXED) { |
a5516438 | 138 | if (prepare_hugepage_range(file, addr, len)) |
5a8130f2 BH |
139 | return -EINVAL; |
140 | return addr; | |
141 | } | |
142 | ||
1da177e4 | 143 | if (addr) { |
39c11e6c | 144 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 LT |
145 | vma = find_vma(mm, addr); |
146 | if (TASK_SIZE - len >= addr && | |
147 | (!vma || addr + len <= vma->vm_start)) | |
148 | return addr; | |
149 | } | |
150 | if (mm->get_unmapped_area == arch_get_unmapped_area) | |
151 | return hugetlb_get_unmapped_area_bottomup(file, addr, len, | |
152 | pgoff, flags); | |
153 | else | |
154 | return hugetlb_get_unmapped_area_topdown(file, addr, len, | |
155 | pgoff, flags); | |
156 | } | |
fd8526ad | 157 | #endif /* CONFIG_HUGETLB_PAGE */ |
1da177e4 | 158 | |
b4718e62 AK |
159 | #ifdef CONFIG_X86_64 |
160 | static __init int setup_hugepagesz(char *opt) | |
161 | { | |
162 | unsigned long ps = memparse(opt, &opt); | |
163 | if (ps == PMD_SIZE) { | |
164 | hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); | |
b8291adc | 165 | } else if (ps == PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES)) { |
b4718e62 AK |
166 | hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); |
167 | } else { | |
2b18e532 | 168 | hugetlb_bad_size(); |
b4718e62 AK |
169 | printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n", |
170 | ps >> 20); | |
171 | return 0; | |
172 | } | |
173 | return 1; | |
174 | } | |
175 | __setup("hugepagesz=", setup_hugepagesz); | |
ece84b39 | 176 | |
080fe206 | 177 | #if (defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA) |
ece84b39 KS |
178 | static __init int gigantic_pages_init(void) |
179 | { | |
080fe206 | 180 | /* With compaction or CMA we can allocate gigantic pages at runtime */ |
b8291adc | 181 | if (boot_cpu_has(X86_FEATURE_GBPAGES) && !size_to_hstate(1UL << PUD_SHIFT)) |
ece84b39 KS |
182 | hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); |
183 | return 0; | |
184 | } | |
185 | arch_initcall(gigantic_pages_init); | |
186 | #endif | |
b4718e62 | 187 | #endif |