1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * IA-32 Huge TLB Page Support for Kernel.
4 *
5 * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com>
6 */
7
8 #include <linux/init.h>
9 #include <linux/fs.h>
10 #include <linux/mm.h>
11 #include <linux/sched/mm.h>
12 #include <linux/hugetlb.h>
13 #include <linux/pagemap.h>
14 #include <linux/err.h>
15 #include <linux/sysctl.h>
16 #include <linux/compat.h>
17 #include <asm/mman.h>
18 #include <asm/tlb.h>
19 #include <asm/tlbflush.h>
20 #include <asm/elf.h>
21
22 /*
23 * pmd_huge() returns 1 if @pmd is hugetlb related entry, that is normal
24 * hugetlb entry or non-present (migration or hwpoisoned) hugetlb entry.
25 * Otherwise, returns 0.
26 */
pmd_huge(pmd_t pmd)27 int pmd_huge(pmd_t pmd)
28 {
29 return !pmd_none(pmd) &&
30 (pmd_val(pmd) & (_PAGE_PRESENT|_PAGE_PSE)) != _PAGE_PRESENT;
31 }
32
33 /*
34 * pud_huge() returns 1 if @pud is hugetlb related entry, that is normal
35 * hugetlb entry or non-present (migration or hwpoisoned) hugetlb entry.
36 * Otherwise, returns 0.
37 */
pud_huge(pud_t pud)38 int pud_huge(pud_t pud)
39 {
40 #if CONFIG_PGTABLE_LEVELS > 2
41 return !pud_none(pud) &&
42 (pud_val(pud) & (_PAGE_PRESENT|_PAGE_PSE)) != _PAGE_PRESENT;
43 #else
44 return 0;
45 #endif
46 }
47
48 #ifdef CONFIG_HUGETLB_PAGE
hugetlb_get_unmapped_area_bottomup(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)49 static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
50 unsigned long addr, unsigned long len,
51 unsigned long pgoff, unsigned long flags)
52 {
53 struct hstate *h = hstate_file(file);
54 struct vm_unmapped_area_info info;
55
56 info.flags = 0;
57 info.length = len;
58 info.low_limit = get_mmap_base(1);
59
60 /*
61 * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area
62 * in the full address space.
63 */
64 info.high_limit = in_32bit_syscall() ?
65 task_size_32bit() : task_size_64bit(addr > DEFAULT_MAP_WINDOW);
66
67 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
68 info.align_offset = 0;
69 return vm_unmapped_area(&info);
70 }
71
hugetlb_get_unmapped_area_topdown(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)72 static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
73 unsigned long addr, unsigned long len,
74 unsigned long pgoff, unsigned long flags)
75 {
76 struct hstate *h = hstate_file(file);
77 struct vm_unmapped_area_info info;
78
79 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
80 info.length = len;
81 info.low_limit = PAGE_SIZE;
82 info.high_limit = get_mmap_base(0);
83
84 /*
85 * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area
86 * in the full address space.
87 */
88 if (addr > DEFAULT_MAP_WINDOW && !in_32bit_syscall())
89 info.high_limit += TASK_SIZE_MAX - DEFAULT_MAP_WINDOW;
90
91 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
92 info.align_offset = 0;
93 addr = vm_unmapped_area(&info);
94
95 /*
96 * A failed mmap() very likely causes application failure,
97 * so fall back to the bottom-up function here. This scenario
98 * can happen with large stack limits and large mmap()
99 * allocations.
100 */
101 if (addr & ~PAGE_MASK) {
102 VM_BUG_ON(addr != -ENOMEM);
103 info.flags = 0;
104 info.low_limit = TASK_UNMAPPED_BASE;
105 info.high_limit = TASK_SIZE_LOW;
106 addr = vm_unmapped_area(&info);
107 }
108
109 return addr;
110 }
111
112 unsigned long
hugetlb_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)113 hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
114 unsigned long len, unsigned long pgoff, unsigned long flags)
115 {
116 struct hstate *h = hstate_file(file);
117 struct mm_struct *mm = current->mm;
118 struct vm_area_struct *vma;
119
120 if (len & ~huge_page_mask(h))
121 return -EINVAL;
122
123 if (len > TASK_SIZE)
124 return -ENOMEM;
125
126 /* No address checking. See comment at mmap_address_hint_valid() */
127 if (flags & MAP_FIXED) {
128 if (prepare_hugepage_range(file, addr, len))
129 return -EINVAL;
130 return addr;
131 }
132
133 if (addr) {
134 addr &= huge_page_mask(h);
135 if (!mmap_address_hint_valid(addr, len))
136 goto get_unmapped_area;
137
138 vma = find_vma(mm, addr);
139 if (!vma || addr + len <= vm_start_gap(vma))
140 return addr;
141 }
142
143 get_unmapped_area:
144 if (mm->get_unmapped_area == arch_get_unmapped_area)
145 return hugetlb_get_unmapped_area_bottomup(file, addr, len,
146 pgoff, flags);
147 else
148 return hugetlb_get_unmapped_area_topdown(file, addr, len,
149 pgoff, flags);
150 }
151 #endif /* CONFIG_HUGETLB_PAGE */
152
153 #ifdef CONFIG_X86_64
arch_hugetlb_valid_size(unsigned long size)154 bool __init arch_hugetlb_valid_size(unsigned long size)
155 {
156 if (size == PMD_SIZE)
157 return true;
158 else if (size == PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES))
159 return true;
160 else
161 return false;
162 }
163
164 #ifdef CONFIG_CONTIG_ALLOC
gigantic_pages_init(void)165 static __init int gigantic_pages_init(void)
166 {
167 /* With compaction or CMA we can allocate gigantic pages at runtime */
168 if (boot_cpu_has(X86_FEATURE_GBPAGES))
169 hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
170 return 0;
171 }
172 arch_initcall(gigantic_pages_init);
173 #endif
174 #endif
175