diff options
Diffstat (limited to 'arch/sparc64/mm/hugetlbpage.c')
-rw-r--r-- | arch/sparc64/mm/hugetlbpage.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/arch/sparc64/mm/hugetlbpage.c b/arch/sparc64/mm/hugetlbpage.c new file mode 100644 index 000000000000..5a1f831b2de1 --- /dev/null +++ b/arch/sparc64/mm/hugetlbpage.c | |||
@@ -0,0 +1,310 @@ | |||
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 | } | ||