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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> | |
01042607 | 10 | #include <linux/sched/mm.h> |
1da177e4 LT |
11 | #include <linux/hugetlb.h> |
12 | #include <linux/pagemap.h> | |
1da177e4 LT |
13 | #include <linux/err.h> |
14 | #include <linux/sysctl.h> | |
e13b73dd | 15 | #include <linux/compat.h> |
1da177e4 LT |
16 | #include <asm/mman.h> |
17 | #include <asm/tlb.h> | |
18 | #include <asm/tlbflush.h> | |
a5a19c63 | 19 | #include <asm/pgalloc.h> |
e13b73dd | 20 | #include <asm/elf.h> |
1da177e4 | 21 | |
1da177e4 LT |
22 | #if 0 /* This is just for testing */ |
23 | struct page * | |
24 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) | |
25 | { | |
26 | unsigned long start = address; | |
27 | int length = 1; | |
28 | int nr; | |
29 | struct page *page; | |
30 | struct vm_area_struct *vma; | |
31 | ||
32 | vma = find_vma(mm, addr); | |
33 | if (!vma || !is_vm_hugetlb_page(vma)) | |
34 | return ERR_PTR(-EINVAL); | |
35 | ||
36 | pte = huge_pte_offset(mm, address); | |
37 | ||
38 | /* hugetlb should be locked, and hence, prefaulted */ | |
39 | WARN_ON(!pte || pte_none(*pte)); | |
40 | ||
41 | page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)]; | |
42 | ||
25e59881 | 43 | WARN_ON(!PageHead(page)); |
1da177e4 LT |
44 | |
45 | return page; | |
46 | } | |
47 | ||
48 | int pmd_huge(pmd_t pmd) | |
49 | { | |
50 | return 0; | |
51 | } | |
52 | ||
ceb86879 AK |
53 | int pud_huge(pud_t pud) |
54 | { | |
55 | return 0; | |
56 | } | |
57 | ||
1da177e4 LT |
58 | #else |
59 | ||
cbef8478 NH |
60 | /* |
61 | * pmd_huge() returns 1 if @pmd is hugetlb related entry, that is normal | |
62 | * hugetlb entry or non-present (migration or hwpoisoned) hugetlb entry. | |
63 | * Otherwise, returns 0. | |
64 | */ | |
1da177e4 LT |
65 | int pmd_huge(pmd_t pmd) |
66 | { | |
cbef8478 NH |
67 | return !pmd_none(pmd) && |
68 | (pmd_val(pmd) & (_PAGE_PRESENT|_PAGE_PSE)) != _PAGE_PRESENT; | |
1da177e4 LT |
69 | } |
70 | ||
ceb86879 AK |
71 | int pud_huge(pud_t pud) |
72 | { | |
39c11e6c | 73 | return !!(pud_val(pud) & _PAGE_PSE); |
ceb86879 | 74 | } |
1da177e4 LT |
75 | #endif |
76 | ||
fd8526ad | 77 | #ifdef CONFIG_HUGETLB_PAGE |
1da177e4 LT |
78 | static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file, |
79 | unsigned long addr, unsigned long len, | |
80 | unsigned long pgoff, unsigned long flags) | |
81 | { | |
39c11e6c | 82 | struct hstate *h = hstate_file(file); |
cdc17344 ML |
83 | struct vm_unmapped_area_info info; |
84 | ||
85 | info.flags = 0; | |
86 | info.length = len; | |
e13b73dd DS |
87 | info.low_limit = get_mmap_base(1); |
88 | info.high_limit = in_compat_syscall() ? | |
89 | tasksize_32bit() : tasksize_64bit(); | |
cdc17344 ML |
90 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); |
91 | info.align_offset = 0; | |
92 | return vm_unmapped_area(&info); | |
1da177e4 LT |
93 | } |
94 | ||
95 | static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file, | |
96 | unsigned long addr0, unsigned long len, | |
97 | unsigned long pgoff, unsigned long flags) | |
98 | { | |
39c11e6c | 99 | struct hstate *h = hstate_file(file); |
cdc17344 ML |
100 | struct vm_unmapped_area_info info; |
101 | unsigned long addr; | |
1da177e4 | 102 | |
cdc17344 ML |
103 | info.flags = VM_UNMAPPED_AREA_TOPDOWN; |
104 | info.length = len; | |
105 | info.low_limit = PAGE_SIZE; | |
e13b73dd | 106 | info.high_limit = get_mmap_base(0); |
cdc17344 ML |
107 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); |
108 | info.align_offset = 0; | |
109 | addr = vm_unmapped_area(&info); | |
1da177e4 | 110 | |
1da177e4 LT |
111 | /* |
112 | * A failed mmap() very likely causes application failure, | |
113 | * so fall back to the bottom-up function here. This scenario | |
114 | * can happen with large stack limits and large mmap() | |
115 | * allocations. | |
116 | */ | |
cdc17344 ML |
117 | if (addr & ~PAGE_MASK) { |
118 | VM_BUG_ON(addr != -ENOMEM); | |
119 | info.flags = 0; | |
120 | info.low_limit = TASK_UNMAPPED_BASE; | |
121 | info.high_limit = TASK_SIZE; | |
122 | addr = vm_unmapped_area(&info); | |
123 | } | |
1da177e4 LT |
124 | |
125 | return addr; | |
126 | } | |
127 | ||
128 | unsigned long | |
129 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
130 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
131 | { | |
39c11e6c | 132 | struct hstate *h = hstate_file(file); |
1da177e4 LT |
133 | struct mm_struct *mm = current->mm; |
134 | struct vm_area_struct *vma; | |
135 | ||
39c11e6c | 136 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
137 | return -EINVAL; |
138 | if (len > TASK_SIZE) | |
139 | return -ENOMEM; | |
140 | ||
5a8130f2 | 141 | if (flags & MAP_FIXED) { |
a5516438 | 142 | if (prepare_hugepage_range(file, addr, len)) |
5a8130f2 BH |
143 | return -EINVAL; |
144 | return addr; | |
145 | } | |
146 | ||
1da177e4 | 147 | if (addr) { |
39c11e6c | 148 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 LT |
149 | vma = find_vma(mm, addr); |
150 | if (TASK_SIZE - len >= addr && | |
1be7107f | 151 | (!vma || addr + len <= vm_start_gap(vma))) |
1da177e4 LT |
152 | return addr; |
153 | } | |
154 | if (mm->get_unmapped_area == arch_get_unmapped_area) | |
155 | return hugetlb_get_unmapped_area_bottomup(file, addr, len, | |
156 | pgoff, flags); | |
157 | else | |
158 | return hugetlb_get_unmapped_area_topdown(file, addr, len, | |
159 | pgoff, flags); | |
160 | } | |
fd8526ad | 161 | #endif /* CONFIG_HUGETLB_PAGE */ |
1da177e4 | 162 | |
b4718e62 AK |
163 | #ifdef CONFIG_X86_64 |
164 | static __init int setup_hugepagesz(char *opt) | |
165 | { | |
166 | unsigned long ps = memparse(opt, &opt); | |
167 | if (ps == PMD_SIZE) { | |
168 | hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); | |
b8291adc | 169 | } else if (ps == PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES)) { |
b4718e62 AK |
170 | hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); |
171 | } else { | |
2b18e532 | 172 | hugetlb_bad_size(); |
b4718e62 AK |
173 | printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n", |
174 | ps >> 20); | |
175 | return 0; | |
176 | } | |
177 | return 1; | |
178 | } | |
179 | __setup("hugepagesz=", setup_hugepagesz); | |
ece84b39 | 180 | |
080fe206 | 181 | #if (defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA) |
ece84b39 KS |
182 | static __init int gigantic_pages_init(void) |
183 | { | |
080fe206 | 184 | /* With compaction or CMA we can allocate gigantic pages at runtime */ |
b8291adc | 185 | if (boot_cpu_has(X86_FEATURE_GBPAGES) && !size_to_hstate(1UL << PUD_SHIFT)) |
ece84b39 KS |
186 | hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); |
187 | return 0; | |
188 | } | |
189 | arch_initcall(gigantic_pages_init); | |
190 | #endif | |
b4718e62 | 191 | #endif |