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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 */
27int 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 */
38int 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
49static 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
72static 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
112unsigned long
113hugetlb_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
143get_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
154bool __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
165static __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}
172arch_initcall(gigantic_pages_init);
173#endif
174#endif
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/pgalloc.h>
21#include <asm/elf.h>
22#include <asm/mpx.h>
23
24#if 0 /* This is just for testing */
25struct page *
26follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
27{
28 unsigned long start = address;
29 int length = 1;
30 int nr;
31 struct page *page;
32 struct vm_area_struct *vma;
33
34 vma = find_vma(mm, addr);
35 if (!vma || !is_vm_hugetlb_page(vma))
36 return ERR_PTR(-EINVAL);
37
38 pte = huge_pte_offset(mm, address, vma_mmu_pagesize(vma));
39
40 /* hugetlb should be locked, and hence, prefaulted */
41 WARN_ON(!pte || pte_none(*pte));
42
43 page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)];
44
45 WARN_ON(!PageHead(page));
46
47 return page;
48}
49
50int pmd_huge(pmd_t pmd)
51{
52 return 0;
53}
54
55int pud_huge(pud_t pud)
56{
57 return 0;
58}
59
60#else
61
62/*
63 * pmd_huge() returns 1 if @pmd is hugetlb related entry, that is normal
64 * hugetlb entry or non-present (migration or hwpoisoned) hugetlb entry.
65 * Otherwise, returns 0.
66 */
67int pmd_huge(pmd_t pmd)
68{
69 return !pmd_none(pmd) &&
70 (pmd_val(pmd) & (_PAGE_PRESENT|_PAGE_PSE)) != _PAGE_PRESENT;
71}
72
73int pud_huge(pud_t pud)
74{
75 return !!(pud_val(pud) & _PAGE_PSE);
76}
77#endif
78
79#ifdef CONFIG_HUGETLB_PAGE
80static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
81 unsigned long addr, unsigned long len,
82 unsigned long pgoff, unsigned long flags)
83{
84 struct hstate *h = hstate_file(file);
85 struct vm_unmapped_area_info info;
86
87 info.flags = 0;
88 info.length = len;
89 info.low_limit = get_mmap_base(1);
90
91 /*
92 * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area
93 * in the full address space.
94 */
95 info.high_limit = in_32bit_syscall() ?
96 task_size_32bit() : task_size_64bit(addr > DEFAULT_MAP_WINDOW);
97
98 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
99 info.align_offset = 0;
100 return vm_unmapped_area(&info);
101}
102
103static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
104 unsigned long addr, unsigned long len,
105 unsigned long pgoff, unsigned long flags)
106{
107 struct hstate *h = hstate_file(file);
108 struct vm_unmapped_area_info info;
109
110 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
111 info.length = len;
112 info.low_limit = PAGE_SIZE;
113 info.high_limit = get_mmap_base(0);
114
115 /*
116 * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area
117 * in the full address space.
118 */
119 if (addr > DEFAULT_MAP_WINDOW && !in_32bit_syscall())
120 info.high_limit += TASK_SIZE_MAX - DEFAULT_MAP_WINDOW;
121
122 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
123 info.align_offset = 0;
124 addr = vm_unmapped_area(&info);
125
126 /*
127 * A failed mmap() very likely causes application failure,
128 * so fall back to the bottom-up function here. This scenario
129 * can happen with large stack limits and large mmap()
130 * allocations.
131 */
132 if (addr & ~PAGE_MASK) {
133 VM_BUG_ON(addr != -ENOMEM);
134 info.flags = 0;
135 info.low_limit = TASK_UNMAPPED_BASE;
136 info.high_limit = TASK_SIZE_LOW;
137 addr = vm_unmapped_area(&info);
138 }
139
140 return addr;
141}
142
143unsigned long
144hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
145 unsigned long len, unsigned long pgoff, unsigned long flags)
146{
147 struct hstate *h = hstate_file(file);
148 struct mm_struct *mm = current->mm;
149 struct vm_area_struct *vma;
150
151 if (len & ~huge_page_mask(h))
152 return -EINVAL;
153
154 addr = mpx_unmapped_area_check(addr, len, flags);
155 if (IS_ERR_VALUE(addr))
156 return addr;
157
158 if (len > TASK_SIZE)
159 return -ENOMEM;
160
161 /* No address checking. See comment at mmap_address_hint_valid() */
162 if (flags & MAP_FIXED) {
163 if (prepare_hugepage_range(file, addr, len))
164 return -EINVAL;
165 return addr;
166 }
167
168 if (addr) {
169 addr &= huge_page_mask(h);
170 if (!mmap_address_hint_valid(addr, len))
171 goto get_unmapped_area;
172
173 vma = find_vma(mm, addr);
174 if (!vma || addr + len <= vm_start_gap(vma))
175 return addr;
176 }
177
178get_unmapped_area:
179 if (mm->get_unmapped_area == arch_get_unmapped_area)
180 return hugetlb_get_unmapped_area_bottomup(file, addr, len,
181 pgoff, flags);
182 else
183 return hugetlb_get_unmapped_area_topdown(file, addr, len,
184 pgoff, flags);
185}
186#endif /* CONFIG_HUGETLB_PAGE */
187
188#ifdef CONFIG_X86_64
189static __init int setup_hugepagesz(char *opt)
190{
191 unsigned long ps = memparse(opt, &opt);
192 if (ps == PMD_SIZE) {
193 hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
194 } else if (ps == PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES)) {
195 hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
196 } else {
197 hugetlb_bad_size();
198 printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n",
199 ps >> 20);
200 return 0;
201 }
202 return 1;
203}
204__setup("hugepagesz=", setup_hugepagesz);
205
206#ifdef CONFIG_CONTIG_ALLOC
207static __init int gigantic_pages_init(void)
208{
209 /* With compaction or CMA we can allocate gigantic pages at runtime */
210 if (boot_cpu_has(X86_FEATURE_GBPAGES) && !size_to_hstate(1UL << PUD_SHIFT))
211 hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
212 return 0;
213}
214arch_initcall(gigantic_pages_init);
215#endif
216#endif