Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * SPARC64 Huge TLB page support. | |
3 | * | |
4 | * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com) | |
5 | */ | |
6 | ||
7 | #include <linux/config.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/hugetlb.h> | |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/smp_lock.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/sysctl.h> | |
17 | ||
18 | #include <asm/mman.h> | |
19 | #include <asm/pgalloc.h> | |
20 | #include <asm/tlb.h> | |
21 | #include <asm/tlbflush.h> | |
22 | #include <asm/cacheflush.h> | |
23 | #include <asm/mmu_context.h> | |
24 | ||
25 | static pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) | |
26 | { | |
27 | pgd_t *pgd; | |
28 | pud_t *pud; | |
29 | pmd_t *pmd; | |
30 | pte_t *pte = NULL; | |
31 | ||
32 | pgd = pgd_offset(mm, addr); | |
33 | if (pgd) { | |
34 | pud = pud_offset(pgd, addr); | |
35 | if (pud) { | |
36 | pmd = pmd_alloc(mm, pud, addr); | |
37 | if (pmd) | |
38 | pte = pte_alloc_map(mm, pmd, addr); | |
39 | } | |
40 | } | |
41 | return pte; | |
42 | } | |
43 | ||
44 | static pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) | |
45 | { | |
46 | pgd_t *pgd; | |
47 | pud_t *pud; | |
48 | pmd_t *pmd; | |
49 | pte_t *pte = NULL; | |
50 | ||
51 | pgd = pgd_offset(mm, addr); | |
52 | if (pgd) { | |
53 | pud = pud_offset(pgd, addr); | |
54 | if (pud) { | |
55 | pmd = pmd_offset(pud, addr); | |
56 | if (pmd) | |
57 | pte = pte_offset_map(pmd, addr); | |
58 | } | |
59 | } | |
60 | return pte; | |
61 | } | |
62 | ||
63 | #define mk_pte_huge(entry) do { pte_val(entry) |= _PAGE_SZHUGE; } while (0) | |
64 | ||
65 | static void set_huge_pte(struct mm_struct *mm, struct vm_area_struct *vma, | |
66 | unsigned long addr, | |
67 | struct page *page, pte_t * page_table, int write_access) | |
68 | { | |
69 | unsigned long i; | |
70 | pte_t entry; | |
71 | ||
72 | add_mm_counter(mm, rss, HPAGE_SIZE / PAGE_SIZE); | |
73 | ||
74 | if (write_access) | |
75 | entry = pte_mkwrite(pte_mkdirty(mk_pte(page, | |
76 | vma->vm_page_prot))); | |
77 | else | |
78 | entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot)); | |
79 | entry = pte_mkyoung(entry); | |
80 | mk_pte_huge(entry); | |
81 | ||
82 | for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) { | |
83 | set_pte_at(mm, addr, page_table, entry); | |
84 | page_table++; | |
85 | addr += PAGE_SIZE; | |
86 | ||
87 | pte_val(entry) += PAGE_SIZE; | |
88 | } | |
89 | } | |
90 | ||
91 | /* | |
92 | * This function checks for proper alignment of input addr and len parameters. | |
93 | */ | |
94 | int is_aligned_hugepage_range(unsigned long addr, unsigned long len) | |
95 | { | |
96 | if (len & ~HPAGE_MASK) | |
97 | return -EINVAL; | |
98 | if (addr & ~HPAGE_MASK) | |
99 | return -EINVAL; | |
100 | return 0; | |
101 | } | |
102 | ||
103 | int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, | |
104 | struct vm_area_struct *vma) | |
105 | { | |
106 | pte_t *src_pte, *dst_pte, entry; | |
107 | struct page *ptepage; | |
108 | unsigned long addr = vma->vm_start; | |
109 | unsigned long end = vma->vm_end; | |
110 | int i; | |
111 | ||
112 | while (addr < end) { | |
113 | dst_pte = huge_pte_alloc(dst, addr); | |
114 | if (!dst_pte) | |
115 | goto nomem; | |
116 | src_pte = huge_pte_offset(src, addr); | |
117 | BUG_ON(!src_pte || pte_none(*src_pte)); | |
118 | entry = *src_pte; | |
119 | ptepage = pte_page(entry); | |
120 | get_page(ptepage); | |
121 | for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) { | |
122 | set_pte_at(dst, addr, dst_pte, entry); | |
123 | pte_val(entry) += PAGE_SIZE; | |
124 | dst_pte++; | |
125 | addr += PAGE_SIZE; | |
126 | } | |
127 | add_mm_counter(dst, rss, HPAGE_SIZE / PAGE_SIZE); | |
128 | } | |
129 | return 0; | |
130 | ||
131 | nomem: | |
132 | return -ENOMEM; | |
133 | } | |
134 | ||
135 | int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, | |
136 | struct page **pages, struct vm_area_struct **vmas, | |
137 | unsigned long *position, int *length, int i) | |
138 | { | |
139 | unsigned long vaddr = *position; | |
140 | int remainder = *length; | |
141 | ||
142 | WARN_ON(!is_vm_hugetlb_page(vma)); | |
143 | ||
144 | while (vaddr < vma->vm_end && remainder) { | |
145 | if (pages) { | |
146 | pte_t *pte; | |
147 | struct page *page; | |
148 | ||
149 | pte = huge_pte_offset(mm, vaddr); | |
150 | ||
151 | /* hugetlb should be locked, and hence, prefaulted */ | |
152 | BUG_ON(!pte || pte_none(*pte)); | |
153 | ||
154 | page = pte_page(*pte); | |
155 | ||
156 | WARN_ON(!PageCompound(page)); | |
157 | ||
158 | get_page(page); | |
159 | pages[i] = page; | |
160 | } | |
161 | ||
162 | if (vmas) | |
163 | vmas[i] = vma; | |
164 | ||
165 | vaddr += PAGE_SIZE; | |
166 | --remainder; | |
167 | ++i; | |
168 | } | |
169 | ||
170 | *length = remainder; | |
171 | *position = vaddr; | |
172 | ||
173 | return i; | |
174 | } | |
175 | ||
176 | struct page *follow_huge_addr(struct mm_struct *mm, | |
177 | unsigned long address, int write) | |
178 | { | |
179 | return ERR_PTR(-EINVAL); | |
180 | } | |
181 | ||
182 | int pmd_huge(pmd_t pmd) | |
183 | { | |
184 | return 0; | |
185 | } | |
186 | ||
187 | struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address, | |
188 | pmd_t *pmd, int write) | |
189 | { | |
190 | return NULL; | |
191 | } | |
192 | ||
193 | void unmap_hugepage_range(struct vm_area_struct *vma, | |
194 | unsigned long start, unsigned long end) | |
195 | { | |
196 | struct mm_struct *mm = vma->vm_mm; | |
197 | unsigned long address; | |
198 | pte_t *pte; | |
199 | struct page *page; | |
200 | int i; | |
201 | ||
202 | BUG_ON(start & (HPAGE_SIZE - 1)); | |
203 | BUG_ON(end & (HPAGE_SIZE - 1)); | |
204 | ||
205 | for (address = start; address < end; address += HPAGE_SIZE) { | |
206 | pte = huge_pte_offset(mm, address); | |
207 | BUG_ON(!pte); | |
208 | if (pte_none(*pte)) | |
209 | continue; | |
210 | page = pte_page(*pte); | |
211 | put_page(page); | |
212 | for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) { | |
213 | pte_clear(mm, address+(i*PAGE_SIZE), pte); | |
214 | pte++; | |
215 | } | |
216 | } | |
217 | add_mm_counter(mm, rss, -((end - start) >> PAGE_SHIFT)); | |
218 | flush_tlb_range(vma, start, end); | |
219 | } | |
220 | ||
221 | static void context_reload(void *__data) | |
222 | { | |
223 | struct mm_struct *mm = __data; | |
224 | ||
225 | if (mm == current->mm) | |
226 | load_secondary_context(mm); | |
227 | } | |
228 | ||
229 | int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma) | |
230 | { | |
231 | struct mm_struct *mm = current->mm; | |
232 | unsigned long addr; | |
233 | int ret = 0; | |
234 | ||
235 | /* On UltraSPARC-III+ and later, configure the second half of | |
236 | * the Data-TLB for huge pages. | |
237 | */ | |
238 | if (tlb_type == cheetah_plus) { | |
239 | unsigned long ctx; | |
240 | ||
241 | spin_lock(&ctx_alloc_lock); | |
242 | ctx = mm->context.sparc64_ctx_val; | |
243 | ctx &= ~CTX_PGSZ_MASK; | |
244 | ctx |= CTX_PGSZ_BASE << CTX_PGSZ0_SHIFT; | |
245 | ctx |= CTX_PGSZ_HUGE << CTX_PGSZ1_SHIFT; | |
246 | ||
247 | if (ctx != mm->context.sparc64_ctx_val) { | |
248 | /* When changing the page size fields, we | |
249 | * must perform a context flush so that no | |
250 | * stale entries match. This flush must | |
251 | * occur with the original context register | |
252 | * settings. | |
253 | */ | |
254 | do_flush_tlb_mm(mm); | |
255 | ||
256 | /* Reload the context register of all processors | |
257 | * also executing in this address space. | |
258 | */ | |
259 | mm->context.sparc64_ctx_val = ctx; | |
260 | on_each_cpu(context_reload, mm, 0, 0); | |
261 | } | |
262 | spin_unlock(&ctx_alloc_lock); | |
263 | } | |
264 | ||
265 | BUG_ON(vma->vm_start & ~HPAGE_MASK); | |
266 | BUG_ON(vma->vm_end & ~HPAGE_MASK); | |
267 | ||
268 | spin_lock(&mm->page_table_lock); | |
269 | for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) { | |
270 | unsigned long idx; | |
271 | pte_t *pte = huge_pte_alloc(mm, addr); | |
272 | struct page *page; | |
273 | ||
274 | if (!pte) { | |
275 | ret = -ENOMEM; | |
276 | goto out; | |
277 | } | |
278 | if (!pte_none(*pte)) | |
279 | continue; | |
280 | ||
281 | idx = ((addr - vma->vm_start) >> HPAGE_SHIFT) | |
282 | + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT)); | |
283 | page = find_get_page(mapping, idx); | |
284 | if (!page) { | |
285 | /* charge the fs quota first */ | |
286 | if (hugetlb_get_quota(mapping)) { | |
287 | ret = -ENOMEM; | |
288 | goto out; | |
289 | } | |
290 | page = alloc_huge_page(); | |
291 | if (!page) { | |
292 | hugetlb_put_quota(mapping); | |
293 | ret = -ENOMEM; | |
294 | goto out; | |
295 | } | |
296 | ret = add_to_page_cache(page, mapping, idx, GFP_ATOMIC); | |
297 | if (! ret) { | |
298 | unlock_page(page); | |
299 | } else { | |
300 | hugetlb_put_quota(mapping); | |
301 | free_huge_page(page); | |
302 | goto out; | |
303 | } | |
304 | } | |
305 | set_huge_pte(mm, vma, addr, page, pte, vma->vm_flags & VM_WRITE); | |
306 | } | |
307 | out: | |
308 | spin_unlock(&mm->page_table_lock); | |
309 | return ret; | |
310 | } |