Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * SPARC64 Huge TLB page support. | |
3 | * | |
f6b83f07 | 4 | * Copyright (C) 2002, 2003, 2006 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
5 | */ |
6 | ||
1da177e4 LT |
7 | #include <linux/fs.h> |
8 | #include <linux/mm.h> | |
9 | #include <linux/hugetlb.h> | |
10 | #include <linux/pagemap.h> | |
1da177e4 LT |
11 | #include <linux/sysctl.h> |
12 | ||
13 | #include <asm/mman.h> | |
14 | #include <asm/pgalloc.h> | |
15 | #include <asm/tlb.h> | |
16 | #include <asm/tlbflush.h> | |
17 | #include <asm/cacheflush.h> | |
18 | #include <asm/mmu_context.h> | |
19 | ||
f6b83f07 DM |
20 | /* Slightly simplified from the non-hugepage variant because by |
21 | * definition we don't have to worry about any page coloring stuff | |
22 | */ | |
f6b83f07 DM |
23 | |
24 | static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp, | |
25 | unsigned long addr, | |
26 | unsigned long len, | |
27 | unsigned long pgoff, | |
28 | unsigned long flags) | |
29 | { | |
f6b83f07 | 30 | unsigned long task_size = TASK_SIZE; |
2aea28b9 | 31 | struct vm_unmapped_area_info info; |
f6b83f07 DM |
32 | |
33 | if (test_thread_flag(TIF_32BIT)) | |
34 | task_size = STACK_TOP32; | |
f6b83f07 | 35 | |
2aea28b9 ML |
36 | info.flags = 0; |
37 | info.length = len; | |
38 | info.low_limit = TASK_UNMAPPED_BASE; | |
39 | info.high_limit = min(task_size, VA_EXCLUDE_START); | |
40 | info.align_mask = PAGE_MASK & ~HPAGE_MASK; | |
41 | info.align_offset = 0; | |
42 | addr = vm_unmapped_area(&info); | |
43 | ||
44 | if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) { | |
45 | VM_BUG_ON(addr != -ENOMEM); | |
46 | info.low_limit = VA_EXCLUDE_END; | |
47 | info.high_limit = task_size; | |
48 | addr = vm_unmapped_area(&info); | |
f6b83f07 DM |
49 | } |
50 | ||
2aea28b9 | 51 | return addr; |
f6b83f07 DM |
52 | } |
53 | ||
54 | static unsigned long | |
55 | hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, | |
56 | const unsigned long len, | |
57 | const unsigned long pgoff, | |
58 | const unsigned long flags) | |
59 | { | |
f6b83f07 DM |
60 | struct mm_struct *mm = current->mm; |
61 | unsigned long addr = addr0; | |
2aea28b9 | 62 | struct vm_unmapped_area_info info; |
f6b83f07 DM |
63 | |
64 | /* This should only ever run for 32-bit processes. */ | |
65 | BUG_ON(!test_thread_flag(TIF_32BIT)); | |
66 | ||
2aea28b9 ML |
67 | info.flags = VM_UNMAPPED_AREA_TOPDOWN; |
68 | info.length = len; | |
69 | info.low_limit = PAGE_SIZE; | |
70 | info.high_limit = mm->mmap_base; | |
71 | info.align_mask = PAGE_MASK & ~HPAGE_MASK; | |
72 | info.align_offset = 0; | |
73 | addr = vm_unmapped_area(&info); | |
f6b83f07 | 74 | |
f6b83f07 DM |
75 | /* |
76 | * A failed mmap() very likely causes application failure, | |
77 | * so fall back to the bottom-up function here. This scenario | |
78 | * can happen with large stack limits and large mmap() | |
79 | * allocations. | |
80 | */ | |
2aea28b9 ML |
81 | if (addr & ~PAGE_MASK) { |
82 | VM_BUG_ON(addr != -ENOMEM); | |
83 | info.flags = 0; | |
84 | info.low_limit = TASK_UNMAPPED_BASE; | |
85 | info.high_limit = STACK_TOP32; | |
86 | addr = vm_unmapped_area(&info); | |
87 | } | |
f6b83f07 DM |
88 | |
89 | return addr; | |
90 | } | |
91 | ||
92 | unsigned long | |
93 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
94 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
95 | { | |
96 | struct mm_struct *mm = current->mm; | |
97 | struct vm_area_struct *vma; | |
98 | unsigned long task_size = TASK_SIZE; | |
99 | ||
100 | if (test_thread_flag(TIF_32BIT)) | |
101 | task_size = STACK_TOP32; | |
102 | ||
103 | if (len & ~HPAGE_MASK) | |
104 | return -EINVAL; | |
105 | if (len > task_size) | |
106 | return -ENOMEM; | |
107 | ||
ac35ee48 | 108 | if (flags & MAP_FIXED) { |
a5516438 | 109 | if (prepare_hugepage_range(file, addr, len)) |
ac35ee48 BH |
110 | return -EINVAL; |
111 | return addr; | |
112 | } | |
113 | ||
f6b83f07 DM |
114 | if (addr) { |
115 | addr = ALIGN(addr, HPAGE_SIZE); | |
116 | vma = find_vma(mm, addr); | |
117 | if (task_size - len >= addr && | |
118 | (!vma || addr + len <= vma->vm_start)) | |
119 | return addr; | |
120 | } | |
121 | if (mm->get_unmapped_area == arch_get_unmapped_area) | |
122 | return hugetlb_get_unmapped_area_bottomup(file, addr, len, | |
123 | pgoff, flags); | |
124 | else | |
125 | return hugetlb_get_unmapped_area_topdown(file, addr, len, | |
126 | pgoff, flags); | |
127 | } | |
128 | ||
a5516438 AK |
129 | pte_t *huge_pte_alloc(struct mm_struct *mm, |
130 | unsigned long addr, unsigned long sz) | |
1da177e4 LT |
131 | { |
132 | pgd_t *pgd; | |
133 | pud_t *pud; | |
134 | pmd_t *pmd; | |
135 | pte_t *pte = NULL; | |
136 | ||
9df1dab1 DM |
137 | /* We must align the address, because our caller will run |
138 | * set_huge_pte_at() on whatever we return, which writes out | |
139 | * all of the sub-ptes for the hugepage range. So we have | |
140 | * to give it the first such sub-pte. | |
141 | */ | |
142 | addr &= HPAGE_MASK; | |
143 | ||
1da177e4 | 144 | pgd = pgd_offset(mm, addr); |
dcc1e8dd DM |
145 | pud = pud_alloc(mm, pgd, addr); |
146 | if (pud) { | |
147 | pmd = pmd_alloc(mm, pud, addr); | |
148 | if (pmd) | |
3ed3a4f0 | 149 | pte = pte_alloc_map(mm, pmd, addr); |
1da177e4 LT |
150 | } |
151 | return pte; | |
152 | } | |
153 | ||
63551ae0 | 154 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) |
1da177e4 LT |
155 | { |
156 | pgd_t *pgd; | |
157 | pud_t *pud; | |
158 | pmd_t *pmd; | |
159 | pte_t *pte = NULL; | |
160 | ||
f6b83f07 DM |
161 | addr &= HPAGE_MASK; |
162 | ||
1da177e4 | 163 | pgd = pgd_offset(mm, addr); |
f6b83f07 | 164 | if (!pgd_none(*pgd)) { |
1da177e4 | 165 | pud = pud_offset(pgd, addr); |
f6b83f07 | 166 | if (!pud_none(*pud)) { |
1da177e4 | 167 | pmd = pmd_offset(pud, addr); |
f6b83f07 | 168 | if (!pmd_none(*pmd)) |
1da177e4 LT |
169 | pte = pte_offset_map(pmd, addr); |
170 | } | |
171 | } | |
172 | return pte; | |
173 | } | |
174 | ||
63551ae0 DG |
175 | void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, |
176 | pte_t *ptep, pte_t entry) | |
1da177e4 | 177 | { |
63551ae0 | 178 | int i; |
24e49ee3 NG |
179 | pte_t orig[2]; |
180 | unsigned long nptes; | |
63551ae0 | 181 | |
dcc1e8dd DM |
182 | if (!pte_present(*ptep) && pte_present(entry)) |
183 | mm->context.huge_pte_count++; | |
184 | ||
bb8236f2 | 185 | addr &= HPAGE_MASK; |
24e49ee3 NG |
186 | |
187 | nptes = 1 << HUGETLB_PAGE_ORDER; | |
188 | orig[0] = *ptep; | |
189 | orig[1] = *(ptep + nptes / 2); | |
190 | for (i = 0; i < nptes; i++) { | |
191 | *ptep = entry; | |
63551ae0 DG |
192 | ptep++; |
193 | addr += PAGE_SIZE; | |
194 | pte_val(entry) += PAGE_SIZE; | |
195 | } | |
24e49ee3 NG |
196 | |
197 | /* Issue TLB flush at REAL_HPAGE_SIZE boundaries */ | |
198 | addr -= REAL_HPAGE_SIZE; | |
199 | ptep -= nptes / 2; | |
200 | maybe_tlb_batch_add(mm, addr, ptep, orig[1], 0); | |
201 | addr -= REAL_HPAGE_SIZE; | |
202 | ptep -= nptes / 2; | |
203 | maybe_tlb_batch_add(mm, addr, ptep, orig[0], 0); | |
63551ae0 | 204 | } |
1da177e4 | 205 | |
63551ae0 DG |
206 | pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, |
207 | pte_t *ptep) | |
208 | { | |
209 | pte_t entry; | |
210 | int i; | |
24e49ee3 | 211 | unsigned long nptes; |
1da177e4 | 212 | |
63551ae0 | 213 | entry = *ptep; |
dcc1e8dd DM |
214 | if (pte_present(entry)) |
215 | mm->context.huge_pte_count--; | |
1da177e4 | 216 | |
bb8236f2 | 217 | addr &= HPAGE_MASK; |
24e49ee3 NG |
218 | nptes = 1 << HUGETLB_PAGE_ORDER; |
219 | for (i = 0; i < nptes; i++) { | |
220 | *ptep = __pte(0UL); | |
1da177e4 | 221 | addr += PAGE_SIZE; |
63551ae0 | 222 | ptep++; |
1da177e4 | 223 | } |
63551ae0 | 224 | |
24e49ee3 NG |
225 | /* Issue TLB flush at REAL_HPAGE_SIZE boundaries */ |
226 | addr -= REAL_HPAGE_SIZE; | |
227 | ptep -= nptes / 2; | |
228 | maybe_tlb_batch_add(mm, addr, ptep, entry, 0); | |
229 | addr -= REAL_HPAGE_SIZE; | |
230 | ptep -= nptes / 2; | |
231 | maybe_tlb_batch_add(mm, addr, ptep, entry, 0); | |
232 | ||
63551ae0 | 233 | return entry; |
1da177e4 LT |
234 | } |
235 | ||
1da177e4 LT |
236 | int pmd_huge(pmd_t pmd) |
237 | { | |
238 | return 0; | |
239 | } | |
240 | ||
ceb86879 AK |
241 | int pud_huge(pud_t pud) |
242 | { | |
243 | return 0; | |
244 | } |