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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic hugetlb support. | |
3 | * (C) William Irwin, April 2004 | |
4 | */ | |
5 | #include <linux/gfp.h> | |
6 | #include <linux/list.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/mm.h> | |
1da177e4 LT |
10 | #include <linux/sysctl.h> |
11 | #include <linux/highmem.h> | |
12 | #include <linux/nodemask.h> | |
63551ae0 | 13 | #include <linux/pagemap.h> |
5da7ca86 | 14 | #include <linux/mempolicy.h> |
aea47ff3 | 15 | #include <linux/cpuset.h> |
5da7ca86 | 16 | |
63551ae0 DG |
17 | #include <asm/page.h> |
18 | #include <asm/pgtable.h> | |
19 | ||
20 | #include <linux/hugetlb.h> | |
7835e98b | 21 | #include "internal.h" |
1da177e4 LT |
22 | |
23 | const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL; | |
24 | static unsigned long nr_huge_pages, free_huge_pages; | |
25 | unsigned long max_huge_pages; | |
26 | static struct list_head hugepage_freelists[MAX_NUMNODES]; | |
27 | static unsigned int nr_huge_pages_node[MAX_NUMNODES]; | |
28 | static unsigned int free_huge_pages_node[MAX_NUMNODES]; | |
0bd0f9fb EP |
29 | |
30 | /* | |
31 | * Protects updates to hugepage_freelists, nr_huge_pages, and free_huge_pages | |
32 | */ | |
1da177e4 LT |
33 | static DEFINE_SPINLOCK(hugetlb_lock); |
34 | ||
35 | static void enqueue_huge_page(struct page *page) | |
36 | { | |
37 | int nid = page_to_nid(page); | |
38 | list_add(&page->lru, &hugepage_freelists[nid]); | |
39 | free_huge_pages++; | |
40 | free_huge_pages_node[nid]++; | |
41 | } | |
42 | ||
5da7ca86 CL |
43 | static struct page *dequeue_huge_page(struct vm_area_struct *vma, |
44 | unsigned long address) | |
1da177e4 LT |
45 | { |
46 | int nid = numa_node_id(); | |
47 | struct page *page = NULL; | |
5da7ca86 | 48 | struct zonelist *zonelist = huge_zonelist(vma, address); |
96df9333 | 49 | struct zone **z; |
1da177e4 | 50 | |
96df9333 CL |
51 | for (z = zonelist->zones; *z; z++) { |
52 | nid = (*z)->zone_pgdat->node_id; | |
aea47ff3 CL |
53 | if (cpuset_zone_allowed(*z, GFP_HIGHUSER) && |
54 | !list_empty(&hugepage_freelists[nid])) | |
96df9333 | 55 | break; |
1da177e4 | 56 | } |
96df9333 CL |
57 | |
58 | if (*z) { | |
1da177e4 LT |
59 | page = list_entry(hugepage_freelists[nid].next, |
60 | struct page, lru); | |
61 | list_del(&page->lru); | |
62 | free_huge_pages--; | |
63 | free_huge_pages_node[nid]--; | |
64 | } | |
65 | return page; | |
66 | } | |
67 | ||
a482289d | 68 | static int alloc_fresh_huge_page(void) |
1da177e4 LT |
69 | { |
70 | static int nid = 0; | |
71 | struct page *page; | |
72 | page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN, | |
73 | HUGETLB_PAGE_ORDER); | |
74 | nid = (nid + 1) % num_online_nodes(); | |
75 | if (page) { | |
a482289d | 76 | page[1].lru.next = (void *)free_huge_page; /* dtor */ |
0bd0f9fb | 77 | spin_lock(&hugetlb_lock); |
1da177e4 LT |
78 | nr_huge_pages++; |
79 | nr_huge_pages_node[page_to_nid(page)]++; | |
0bd0f9fb | 80 | spin_unlock(&hugetlb_lock); |
a482289d NP |
81 | put_page(page); /* free it into the hugepage allocator */ |
82 | return 1; | |
1da177e4 | 83 | } |
a482289d | 84 | return 0; |
1da177e4 LT |
85 | } |
86 | ||
87 | void free_huge_page(struct page *page) | |
88 | { | |
89 | BUG_ON(page_count(page)); | |
90 | ||
91 | INIT_LIST_HEAD(&page->lru); | |
1da177e4 LT |
92 | |
93 | spin_lock(&hugetlb_lock); | |
94 | enqueue_huge_page(page); | |
95 | spin_unlock(&hugetlb_lock); | |
96 | } | |
97 | ||
5da7ca86 | 98 | struct page *alloc_huge_page(struct vm_area_struct *vma, unsigned long addr) |
1da177e4 LT |
99 | { |
100 | struct page *page; | |
101 | int i; | |
102 | ||
103 | spin_lock(&hugetlb_lock); | |
5da7ca86 | 104 | page = dequeue_huge_page(vma, addr); |
1da177e4 LT |
105 | if (!page) { |
106 | spin_unlock(&hugetlb_lock); | |
107 | return NULL; | |
108 | } | |
109 | spin_unlock(&hugetlb_lock); | |
7835e98b | 110 | set_page_refcounted(page); |
1da177e4 | 111 | for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); ++i) |
a2dfef69 | 112 | clear_user_highpage(&page[i], addr); |
1da177e4 LT |
113 | return page; |
114 | } | |
115 | ||
116 | static int __init hugetlb_init(void) | |
117 | { | |
118 | unsigned long i; | |
1da177e4 | 119 | |
3c726f8d BH |
120 | if (HPAGE_SHIFT == 0) |
121 | return 0; | |
122 | ||
1da177e4 LT |
123 | for (i = 0; i < MAX_NUMNODES; ++i) |
124 | INIT_LIST_HEAD(&hugepage_freelists[i]); | |
125 | ||
126 | for (i = 0; i < max_huge_pages; ++i) { | |
a482289d | 127 | if (!alloc_fresh_huge_page()) |
1da177e4 | 128 | break; |
1da177e4 LT |
129 | } |
130 | max_huge_pages = free_huge_pages = nr_huge_pages = i; | |
131 | printk("Total HugeTLB memory allocated, %ld\n", free_huge_pages); | |
132 | return 0; | |
133 | } | |
134 | module_init(hugetlb_init); | |
135 | ||
136 | static int __init hugetlb_setup(char *s) | |
137 | { | |
138 | if (sscanf(s, "%lu", &max_huge_pages) <= 0) | |
139 | max_huge_pages = 0; | |
140 | return 1; | |
141 | } | |
142 | __setup("hugepages=", hugetlb_setup); | |
143 | ||
144 | #ifdef CONFIG_SYSCTL | |
145 | static void update_and_free_page(struct page *page) | |
146 | { | |
147 | int i; | |
148 | nr_huge_pages--; | |
149 | nr_huge_pages_node[page_zone(page)->zone_pgdat->node_id]--; | |
150 | for (i = 0; i < (HPAGE_SIZE / PAGE_SIZE); i++) { | |
151 | page[i].flags &= ~(1 << PG_locked | 1 << PG_error | 1 << PG_referenced | | |
152 | 1 << PG_dirty | 1 << PG_active | 1 << PG_reserved | | |
153 | 1 << PG_private | 1<< PG_writeback); | |
1da177e4 | 154 | } |
a482289d | 155 | page[1].lru.next = NULL; |
7835e98b | 156 | set_page_refcounted(page); |
1da177e4 LT |
157 | __free_pages(page, HUGETLB_PAGE_ORDER); |
158 | } | |
159 | ||
160 | #ifdef CONFIG_HIGHMEM | |
161 | static void try_to_free_low(unsigned long count) | |
162 | { | |
163 | int i, nid; | |
164 | for (i = 0; i < MAX_NUMNODES; ++i) { | |
165 | struct page *page, *next; | |
166 | list_for_each_entry_safe(page, next, &hugepage_freelists[i], lru) { | |
167 | if (PageHighMem(page)) | |
168 | continue; | |
169 | list_del(&page->lru); | |
170 | update_and_free_page(page); | |
171 | nid = page_zone(page)->zone_pgdat->node_id; | |
172 | free_huge_pages--; | |
173 | free_huge_pages_node[nid]--; | |
174 | if (count >= nr_huge_pages) | |
175 | return; | |
176 | } | |
177 | } | |
178 | } | |
179 | #else | |
180 | static inline void try_to_free_low(unsigned long count) | |
181 | { | |
182 | } | |
183 | #endif | |
184 | ||
185 | static unsigned long set_max_huge_pages(unsigned long count) | |
186 | { | |
187 | while (count > nr_huge_pages) { | |
a482289d | 188 | if (!alloc_fresh_huge_page()) |
1da177e4 | 189 | return nr_huge_pages; |
1da177e4 LT |
190 | } |
191 | if (count >= nr_huge_pages) | |
192 | return nr_huge_pages; | |
193 | ||
194 | spin_lock(&hugetlb_lock); | |
195 | try_to_free_low(count); | |
196 | while (count < nr_huge_pages) { | |
5da7ca86 | 197 | struct page *page = dequeue_huge_page(NULL, 0); |
1da177e4 LT |
198 | if (!page) |
199 | break; | |
200 | update_and_free_page(page); | |
201 | } | |
202 | spin_unlock(&hugetlb_lock); | |
203 | return nr_huge_pages; | |
204 | } | |
205 | ||
206 | int hugetlb_sysctl_handler(struct ctl_table *table, int write, | |
207 | struct file *file, void __user *buffer, | |
208 | size_t *length, loff_t *ppos) | |
209 | { | |
210 | proc_doulongvec_minmax(table, write, file, buffer, length, ppos); | |
211 | max_huge_pages = set_max_huge_pages(max_huge_pages); | |
212 | return 0; | |
213 | } | |
214 | #endif /* CONFIG_SYSCTL */ | |
215 | ||
216 | int hugetlb_report_meminfo(char *buf) | |
217 | { | |
218 | return sprintf(buf, | |
219 | "HugePages_Total: %5lu\n" | |
220 | "HugePages_Free: %5lu\n" | |
221 | "Hugepagesize: %5lu kB\n", | |
222 | nr_huge_pages, | |
223 | free_huge_pages, | |
224 | HPAGE_SIZE/1024); | |
225 | } | |
226 | ||
227 | int hugetlb_report_node_meminfo(int nid, char *buf) | |
228 | { | |
229 | return sprintf(buf, | |
230 | "Node %d HugePages_Total: %5u\n" | |
231 | "Node %d HugePages_Free: %5u\n", | |
232 | nid, nr_huge_pages_node[nid], | |
233 | nid, free_huge_pages_node[nid]); | |
234 | } | |
235 | ||
236 | int is_hugepage_mem_enough(size_t size) | |
237 | { | |
238 | return (size + ~HPAGE_MASK)/HPAGE_SIZE <= free_huge_pages; | |
239 | } | |
240 | ||
241 | /* Return the number pages of memory we physically have, in PAGE_SIZE units. */ | |
242 | unsigned long hugetlb_total_pages(void) | |
243 | { | |
244 | return nr_huge_pages * (HPAGE_SIZE / PAGE_SIZE); | |
245 | } | |
1da177e4 LT |
246 | |
247 | /* | |
248 | * We cannot handle pagefaults against hugetlb pages at all. They cause | |
249 | * handle_mm_fault() to try to instantiate regular-sized pages in the | |
250 | * hugegpage VMA. do_page_fault() is supposed to trap this, so BUG is we get | |
251 | * this far. | |
252 | */ | |
253 | static struct page *hugetlb_nopage(struct vm_area_struct *vma, | |
254 | unsigned long address, int *unused) | |
255 | { | |
256 | BUG(); | |
257 | return NULL; | |
258 | } | |
259 | ||
260 | struct vm_operations_struct hugetlb_vm_ops = { | |
261 | .nopage = hugetlb_nopage, | |
262 | }; | |
263 | ||
1e8f889b DG |
264 | static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, |
265 | int writable) | |
63551ae0 DG |
266 | { |
267 | pte_t entry; | |
268 | ||
1e8f889b | 269 | if (writable) { |
63551ae0 DG |
270 | entry = |
271 | pte_mkwrite(pte_mkdirty(mk_pte(page, vma->vm_page_prot))); | |
272 | } else { | |
273 | entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot)); | |
274 | } | |
275 | entry = pte_mkyoung(entry); | |
276 | entry = pte_mkhuge(entry); | |
277 | ||
278 | return entry; | |
279 | } | |
280 | ||
1e8f889b DG |
281 | static void set_huge_ptep_writable(struct vm_area_struct *vma, |
282 | unsigned long address, pte_t *ptep) | |
283 | { | |
284 | pte_t entry; | |
285 | ||
286 | entry = pte_mkwrite(pte_mkdirty(*ptep)); | |
287 | ptep_set_access_flags(vma, address, ptep, entry, 1); | |
288 | update_mmu_cache(vma, address, entry); | |
289 | lazy_mmu_prot_update(entry); | |
290 | } | |
291 | ||
292 | ||
63551ae0 DG |
293 | int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, |
294 | struct vm_area_struct *vma) | |
295 | { | |
296 | pte_t *src_pte, *dst_pte, entry; | |
297 | struct page *ptepage; | |
1c59827d | 298 | unsigned long addr; |
1e8f889b DG |
299 | int cow; |
300 | ||
301 | cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; | |
63551ae0 | 302 | |
1c59827d | 303 | for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) { |
c74df32c HD |
304 | src_pte = huge_pte_offset(src, addr); |
305 | if (!src_pte) | |
306 | continue; | |
63551ae0 DG |
307 | dst_pte = huge_pte_alloc(dst, addr); |
308 | if (!dst_pte) | |
309 | goto nomem; | |
c74df32c | 310 | spin_lock(&dst->page_table_lock); |
1c59827d | 311 | spin_lock(&src->page_table_lock); |
c74df32c | 312 | if (!pte_none(*src_pte)) { |
1e8f889b DG |
313 | if (cow) |
314 | ptep_set_wrprotect(src, addr, src_pte); | |
1c59827d HD |
315 | entry = *src_pte; |
316 | ptepage = pte_page(entry); | |
317 | get_page(ptepage); | |
4294621f | 318 | add_mm_counter(dst, file_rss, HPAGE_SIZE / PAGE_SIZE); |
1c59827d HD |
319 | set_huge_pte_at(dst, addr, dst_pte, entry); |
320 | } | |
321 | spin_unlock(&src->page_table_lock); | |
c74df32c | 322 | spin_unlock(&dst->page_table_lock); |
63551ae0 DG |
323 | } |
324 | return 0; | |
325 | ||
326 | nomem: | |
327 | return -ENOMEM; | |
328 | } | |
329 | ||
330 | void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, | |
331 | unsigned long end) | |
332 | { | |
333 | struct mm_struct *mm = vma->vm_mm; | |
334 | unsigned long address; | |
c7546f8f | 335 | pte_t *ptep; |
63551ae0 DG |
336 | pte_t pte; |
337 | struct page *page; | |
338 | ||
339 | WARN_ON(!is_vm_hugetlb_page(vma)); | |
340 | BUG_ON(start & ~HPAGE_MASK); | |
341 | BUG_ON(end & ~HPAGE_MASK); | |
342 | ||
508034a3 HD |
343 | spin_lock(&mm->page_table_lock); |
344 | ||
365e9c87 HD |
345 | /* Update high watermark before we lower rss */ |
346 | update_hiwater_rss(mm); | |
347 | ||
63551ae0 | 348 | for (address = start; address < end; address += HPAGE_SIZE) { |
c7546f8f | 349 | ptep = huge_pte_offset(mm, address); |
4c887265 | 350 | if (!ptep) |
c7546f8f DG |
351 | continue; |
352 | ||
353 | pte = huge_ptep_get_and_clear(mm, address, ptep); | |
63551ae0 DG |
354 | if (pte_none(pte)) |
355 | continue; | |
c7546f8f | 356 | |
63551ae0 DG |
357 | page = pte_page(pte); |
358 | put_page(page); | |
4294621f | 359 | add_mm_counter(mm, file_rss, (int) -(HPAGE_SIZE / PAGE_SIZE)); |
63551ae0 | 360 | } |
63551ae0 | 361 | |
1da177e4 | 362 | spin_unlock(&mm->page_table_lock); |
508034a3 | 363 | flush_tlb_range(vma, start, end); |
1da177e4 | 364 | } |
63551ae0 | 365 | |
1e8f889b DG |
366 | static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, |
367 | unsigned long address, pte_t *ptep, pte_t pte) | |
368 | { | |
369 | struct page *old_page, *new_page; | |
370 | int i, avoidcopy; | |
371 | ||
372 | old_page = pte_page(pte); | |
373 | ||
374 | /* If no-one else is actually using this page, avoid the copy | |
375 | * and just make the page writable */ | |
376 | avoidcopy = (page_count(old_page) == 1); | |
377 | if (avoidcopy) { | |
378 | set_huge_ptep_writable(vma, address, ptep); | |
379 | return VM_FAULT_MINOR; | |
380 | } | |
381 | ||
382 | page_cache_get(old_page); | |
5da7ca86 | 383 | new_page = alloc_huge_page(vma, address); |
1e8f889b DG |
384 | |
385 | if (!new_page) { | |
386 | page_cache_release(old_page); | |
0df420d8 | 387 | return VM_FAULT_OOM; |
1e8f889b DG |
388 | } |
389 | ||
390 | spin_unlock(&mm->page_table_lock); | |
391 | for (i = 0; i < HPAGE_SIZE/PAGE_SIZE; i++) | |
392 | copy_user_highpage(new_page + i, old_page + i, | |
393 | address + i*PAGE_SIZE); | |
394 | spin_lock(&mm->page_table_lock); | |
395 | ||
396 | ptep = huge_pte_offset(mm, address & HPAGE_MASK); | |
397 | if (likely(pte_same(*ptep, pte))) { | |
398 | /* Break COW */ | |
399 | set_huge_pte_at(mm, address, ptep, | |
400 | make_huge_pte(vma, new_page, 1)); | |
401 | /* Make the old page be freed below */ | |
402 | new_page = old_page; | |
403 | } | |
404 | page_cache_release(new_page); | |
405 | page_cache_release(old_page); | |
406 | return VM_FAULT_MINOR; | |
407 | } | |
408 | ||
86e5216f | 409 | int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma, |
1e8f889b | 410 | unsigned long address, pte_t *ptep, int write_access) |
ac9b9c66 HD |
411 | { |
412 | int ret = VM_FAULT_SIGBUS; | |
4c887265 AL |
413 | unsigned long idx; |
414 | unsigned long size; | |
4c887265 AL |
415 | struct page *page; |
416 | struct address_space *mapping; | |
1e8f889b | 417 | pte_t new_pte; |
4c887265 | 418 | |
4c887265 AL |
419 | mapping = vma->vm_file->f_mapping; |
420 | idx = ((address - vma->vm_start) >> HPAGE_SHIFT) | |
421 | + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT)); | |
422 | ||
423 | /* | |
424 | * Use page lock to guard against racing truncation | |
425 | * before we get page_table_lock. | |
426 | */ | |
6bda666a CL |
427 | retry: |
428 | page = find_lock_page(mapping, idx); | |
429 | if (!page) { | |
430 | if (hugetlb_get_quota(mapping)) | |
431 | goto out; | |
432 | page = alloc_huge_page(vma, address); | |
433 | if (!page) { | |
434 | hugetlb_put_quota(mapping); | |
0df420d8 | 435 | ret = VM_FAULT_OOM; |
6bda666a CL |
436 | goto out; |
437 | } | |
ac9b9c66 | 438 | |
6bda666a CL |
439 | if (vma->vm_flags & VM_SHARED) { |
440 | int err; | |
441 | ||
442 | err = add_to_page_cache(page, mapping, idx, GFP_KERNEL); | |
443 | if (err) { | |
444 | put_page(page); | |
445 | hugetlb_put_quota(mapping); | |
446 | if (err == -EEXIST) | |
447 | goto retry; | |
448 | goto out; | |
449 | } | |
450 | } else | |
451 | lock_page(page); | |
452 | } | |
1e8f889b | 453 | |
ac9b9c66 | 454 | spin_lock(&mm->page_table_lock); |
4c887265 AL |
455 | size = i_size_read(mapping->host) >> HPAGE_SHIFT; |
456 | if (idx >= size) | |
457 | goto backout; | |
458 | ||
459 | ret = VM_FAULT_MINOR; | |
86e5216f | 460 | if (!pte_none(*ptep)) |
4c887265 AL |
461 | goto backout; |
462 | ||
463 | add_mm_counter(mm, file_rss, HPAGE_SIZE / PAGE_SIZE); | |
1e8f889b DG |
464 | new_pte = make_huge_pte(vma, page, ((vma->vm_flags & VM_WRITE) |
465 | && (vma->vm_flags & VM_SHARED))); | |
466 | set_huge_pte_at(mm, address, ptep, new_pte); | |
467 | ||
468 | if (write_access && !(vma->vm_flags & VM_SHARED)) { | |
469 | /* Optimization, do the COW without a second fault */ | |
470 | ret = hugetlb_cow(mm, vma, address, ptep, new_pte); | |
471 | } | |
472 | ||
ac9b9c66 | 473 | spin_unlock(&mm->page_table_lock); |
4c887265 AL |
474 | unlock_page(page); |
475 | out: | |
ac9b9c66 | 476 | return ret; |
4c887265 AL |
477 | |
478 | backout: | |
479 | spin_unlock(&mm->page_table_lock); | |
480 | hugetlb_put_quota(mapping); | |
481 | unlock_page(page); | |
482 | put_page(page); | |
483 | goto out; | |
ac9b9c66 HD |
484 | } |
485 | ||
86e5216f AL |
486 | int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
487 | unsigned long address, int write_access) | |
488 | { | |
489 | pte_t *ptep; | |
490 | pte_t entry; | |
1e8f889b | 491 | int ret; |
86e5216f AL |
492 | |
493 | ptep = huge_pte_alloc(mm, address); | |
494 | if (!ptep) | |
495 | return VM_FAULT_OOM; | |
496 | ||
497 | entry = *ptep; | |
498 | if (pte_none(entry)) | |
1e8f889b | 499 | return hugetlb_no_page(mm, vma, address, ptep, write_access); |
86e5216f | 500 | |
1e8f889b DG |
501 | ret = VM_FAULT_MINOR; |
502 | ||
503 | spin_lock(&mm->page_table_lock); | |
504 | /* Check for a racing update before calling hugetlb_cow */ | |
505 | if (likely(pte_same(entry, *ptep))) | |
506 | if (write_access && !pte_write(entry)) | |
507 | ret = hugetlb_cow(mm, vma, address, ptep, entry); | |
508 | spin_unlock(&mm->page_table_lock); | |
509 | ||
510 | return ret; | |
86e5216f AL |
511 | } |
512 | ||
63551ae0 DG |
513 | int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma, |
514 | struct page **pages, struct vm_area_struct **vmas, | |
515 | unsigned long *position, int *length, int i) | |
516 | { | |
517 | unsigned long vpfn, vaddr = *position; | |
518 | int remainder = *length; | |
519 | ||
63551ae0 | 520 | vpfn = vaddr/PAGE_SIZE; |
1c59827d | 521 | spin_lock(&mm->page_table_lock); |
63551ae0 | 522 | while (vaddr < vma->vm_end && remainder) { |
4c887265 AL |
523 | pte_t *pte; |
524 | struct page *page; | |
63551ae0 | 525 | |
4c887265 AL |
526 | /* |
527 | * Some archs (sparc64, sh*) have multiple pte_ts to | |
528 | * each hugepage. We have to make * sure we get the | |
529 | * first, for the page indexing below to work. | |
530 | */ | |
531 | pte = huge_pte_offset(mm, vaddr & HPAGE_MASK); | |
63551ae0 | 532 | |
4c887265 AL |
533 | if (!pte || pte_none(*pte)) { |
534 | int ret; | |
63551ae0 | 535 | |
4c887265 AL |
536 | spin_unlock(&mm->page_table_lock); |
537 | ret = hugetlb_fault(mm, vma, vaddr, 0); | |
538 | spin_lock(&mm->page_table_lock); | |
539 | if (ret == VM_FAULT_MINOR) | |
540 | continue; | |
63551ae0 | 541 | |
4c887265 AL |
542 | remainder = 0; |
543 | if (!i) | |
544 | i = -EFAULT; | |
545 | break; | |
546 | } | |
547 | ||
548 | if (pages) { | |
549 | page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)]; | |
63551ae0 DG |
550 | get_page(page); |
551 | pages[i] = page; | |
552 | } | |
553 | ||
554 | if (vmas) | |
555 | vmas[i] = vma; | |
556 | ||
557 | vaddr += PAGE_SIZE; | |
558 | ++vpfn; | |
559 | --remainder; | |
560 | ++i; | |
561 | } | |
1c59827d | 562 | spin_unlock(&mm->page_table_lock); |
63551ae0 DG |
563 | *length = remainder; |
564 | *position = vaddr; | |
565 | ||
566 | return i; | |
567 | } | |
8f860591 ZY |
568 | |
569 | void hugetlb_change_protection(struct vm_area_struct *vma, | |
570 | unsigned long address, unsigned long end, pgprot_t newprot) | |
571 | { | |
572 | struct mm_struct *mm = vma->vm_mm; | |
573 | unsigned long start = address; | |
574 | pte_t *ptep; | |
575 | pte_t pte; | |
576 | ||
577 | BUG_ON(address >= end); | |
578 | flush_cache_range(vma, address, end); | |
579 | ||
580 | spin_lock(&mm->page_table_lock); | |
581 | for (; address < end; address += HPAGE_SIZE) { | |
582 | ptep = huge_pte_offset(mm, address); | |
583 | if (!ptep) | |
584 | continue; | |
585 | if (!pte_none(*ptep)) { | |
586 | pte = huge_ptep_get_and_clear(mm, address, ptep); | |
587 | pte = pte_mkhuge(pte_modify(pte, newprot)); | |
588 | set_huge_pte_at(mm, address, ptep, pte); | |
589 | lazy_mmu_prot_update(pte); | |
590 | } | |
591 | } | |
592 | spin_unlock(&mm->page_table_lock); | |
593 | ||
594 | flush_tlb_range(vma, start, end); | |
595 | } | |
596 |