Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/mm/vmalloc.c | |
3 | * | |
4 | * Copyright (C) 1993 Linus Torvalds | |
5 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
6 | * SMP-safe vmalloc/vfree/ioremap, Tigran Aivazian <tigran@veritas.com>, May 2000 | |
7 | * Major rework to support vmap/vunmap, Christoph Hellwig, SGI, August 2002 | |
930fc45a | 8 | * Numa awareness, Christoph Lameter, SGI, June 2005 |
1da177e4 LT |
9 | */ |
10 | ||
11 | #include <linux/mm.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/highmem.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/interrupt.h> | |
a10aa579 | 17 | #include <linux/seq_file.h> |
1da177e4 | 18 | #include <linux/vmalloc.h> |
23016969 | 19 | #include <linux/kallsyms.h> |
1da177e4 LT |
20 | |
21 | #include <asm/uaccess.h> | |
22 | #include <asm/tlbflush.h> | |
23 | ||
24 | ||
25 | DEFINE_RWLOCK(vmlist_lock); | |
26 | struct vm_struct *vmlist; | |
27 | ||
b221385b | 28 | static void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot, |
23016969 | 29 | int node, void *caller); |
b221385b | 30 | |
1da177e4 LT |
31 | static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end) |
32 | { | |
33 | pte_t *pte; | |
34 | ||
35 | pte = pte_offset_kernel(pmd, addr); | |
36 | do { | |
37 | pte_t ptent = ptep_get_and_clear(&init_mm, addr, pte); | |
38 | WARN_ON(!pte_none(ptent) && !pte_present(ptent)); | |
39 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
40 | } | |
41 | ||
42 | static inline void vunmap_pmd_range(pud_t *pud, unsigned long addr, | |
43 | unsigned long end) | |
44 | { | |
45 | pmd_t *pmd; | |
46 | unsigned long next; | |
47 | ||
48 | pmd = pmd_offset(pud, addr); | |
49 | do { | |
50 | next = pmd_addr_end(addr, end); | |
51 | if (pmd_none_or_clear_bad(pmd)) | |
52 | continue; | |
53 | vunmap_pte_range(pmd, addr, next); | |
54 | } while (pmd++, addr = next, addr != end); | |
55 | } | |
56 | ||
57 | static inline void vunmap_pud_range(pgd_t *pgd, unsigned long addr, | |
58 | unsigned long end) | |
59 | { | |
60 | pud_t *pud; | |
61 | unsigned long next; | |
62 | ||
63 | pud = pud_offset(pgd, addr); | |
64 | do { | |
65 | next = pud_addr_end(addr, end); | |
66 | if (pud_none_or_clear_bad(pud)) | |
67 | continue; | |
68 | vunmap_pmd_range(pud, addr, next); | |
69 | } while (pud++, addr = next, addr != end); | |
70 | } | |
71 | ||
c19c03fc | 72 | void unmap_kernel_range(unsigned long addr, unsigned long size) |
1da177e4 LT |
73 | { |
74 | pgd_t *pgd; | |
75 | unsigned long next; | |
c19c03fc BH |
76 | unsigned long start = addr; |
77 | unsigned long end = addr + size; | |
1da177e4 LT |
78 | |
79 | BUG_ON(addr >= end); | |
80 | pgd = pgd_offset_k(addr); | |
81 | flush_cache_vunmap(addr, end); | |
82 | do { | |
83 | next = pgd_addr_end(addr, end); | |
84 | if (pgd_none_or_clear_bad(pgd)) | |
85 | continue; | |
86 | vunmap_pud_range(pgd, addr, next); | |
87 | } while (pgd++, addr = next, addr != end); | |
c19c03fc BH |
88 | flush_tlb_kernel_range(start, end); |
89 | } | |
90 | ||
91 | static void unmap_vm_area(struct vm_struct *area) | |
92 | { | |
93 | unmap_kernel_range((unsigned long)area->addr, area->size); | |
1da177e4 LT |
94 | } |
95 | ||
96 | static int vmap_pte_range(pmd_t *pmd, unsigned long addr, | |
97 | unsigned long end, pgprot_t prot, struct page ***pages) | |
98 | { | |
99 | pte_t *pte; | |
100 | ||
872fec16 | 101 | pte = pte_alloc_kernel(pmd, addr); |
1da177e4 LT |
102 | if (!pte) |
103 | return -ENOMEM; | |
104 | do { | |
105 | struct page *page = **pages; | |
106 | WARN_ON(!pte_none(*pte)); | |
107 | if (!page) | |
108 | return -ENOMEM; | |
109 | set_pte_at(&init_mm, addr, pte, mk_pte(page, prot)); | |
110 | (*pages)++; | |
111 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | static inline int vmap_pmd_range(pud_t *pud, unsigned long addr, | |
116 | unsigned long end, pgprot_t prot, struct page ***pages) | |
117 | { | |
118 | pmd_t *pmd; | |
119 | unsigned long next; | |
120 | ||
121 | pmd = pmd_alloc(&init_mm, pud, addr); | |
122 | if (!pmd) | |
123 | return -ENOMEM; | |
124 | do { | |
125 | next = pmd_addr_end(addr, end); | |
126 | if (vmap_pte_range(pmd, addr, next, prot, pages)) | |
127 | return -ENOMEM; | |
128 | } while (pmd++, addr = next, addr != end); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static inline int vmap_pud_range(pgd_t *pgd, unsigned long addr, | |
133 | unsigned long end, pgprot_t prot, struct page ***pages) | |
134 | { | |
135 | pud_t *pud; | |
136 | unsigned long next; | |
137 | ||
138 | pud = pud_alloc(&init_mm, pgd, addr); | |
139 | if (!pud) | |
140 | return -ENOMEM; | |
141 | do { | |
142 | next = pud_addr_end(addr, end); | |
143 | if (vmap_pmd_range(pud, addr, next, prot, pages)) | |
144 | return -ENOMEM; | |
145 | } while (pud++, addr = next, addr != end); | |
146 | return 0; | |
147 | } | |
148 | ||
149 | int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages) | |
150 | { | |
151 | pgd_t *pgd; | |
152 | unsigned long next; | |
153 | unsigned long addr = (unsigned long) area->addr; | |
154 | unsigned long end = addr + area->size - PAGE_SIZE; | |
155 | int err; | |
156 | ||
157 | BUG_ON(addr >= end); | |
158 | pgd = pgd_offset_k(addr); | |
1da177e4 LT |
159 | do { |
160 | next = pgd_addr_end(addr, end); | |
161 | err = vmap_pud_range(pgd, addr, next, prot, pages); | |
162 | if (err) | |
163 | break; | |
164 | } while (pgd++, addr = next, addr != end); | |
1da177e4 LT |
165 | flush_cache_vmap((unsigned long) area->addr, end); |
166 | return err; | |
167 | } | |
5992b6da | 168 | EXPORT_SYMBOL_GPL(map_vm_area); |
1da177e4 | 169 | |
48667e7a CL |
170 | /* |
171 | * Map a vmalloc()-space virtual address to the physical page. | |
172 | */ | |
b3bdda02 | 173 | struct page *vmalloc_to_page(const void *vmalloc_addr) |
48667e7a CL |
174 | { |
175 | unsigned long addr = (unsigned long) vmalloc_addr; | |
176 | struct page *page = NULL; | |
177 | pgd_t *pgd = pgd_offset_k(addr); | |
178 | pud_t *pud; | |
179 | pmd_t *pmd; | |
180 | pte_t *ptep, pte; | |
181 | ||
182 | if (!pgd_none(*pgd)) { | |
183 | pud = pud_offset(pgd, addr); | |
184 | if (!pud_none(*pud)) { | |
185 | pmd = pmd_offset(pud, addr); | |
186 | if (!pmd_none(*pmd)) { | |
187 | ptep = pte_offset_map(pmd, addr); | |
188 | pte = *ptep; | |
189 | if (pte_present(pte)) | |
190 | page = pte_page(pte); | |
191 | pte_unmap(ptep); | |
192 | } | |
193 | } | |
194 | } | |
195 | return page; | |
196 | } | |
197 | EXPORT_SYMBOL(vmalloc_to_page); | |
198 | ||
199 | /* | |
200 | * Map a vmalloc()-space virtual address to the physical page frame number. | |
201 | */ | |
b3bdda02 | 202 | unsigned long vmalloc_to_pfn(const void *vmalloc_addr) |
48667e7a CL |
203 | { |
204 | return page_to_pfn(vmalloc_to_page(vmalloc_addr)); | |
205 | } | |
206 | EXPORT_SYMBOL(vmalloc_to_pfn); | |
207 | ||
23016969 CL |
208 | static struct vm_struct * |
209 | __get_vm_area_node(unsigned long size, unsigned long flags, unsigned long start, | |
210 | unsigned long end, int node, gfp_t gfp_mask, void *caller) | |
1da177e4 LT |
211 | { |
212 | struct vm_struct **p, *tmp, *area; | |
213 | unsigned long align = 1; | |
214 | unsigned long addr; | |
215 | ||
52fd24ca | 216 | BUG_ON(in_interrupt()); |
1da177e4 LT |
217 | if (flags & VM_IOREMAP) { |
218 | int bit = fls(size); | |
219 | ||
220 | if (bit > IOREMAP_MAX_ORDER) | |
221 | bit = IOREMAP_MAX_ORDER; | |
222 | else if (bit < PAGE_SHIFT) | |
223 | bit = PAGE_SHIFT; | |
224 | ||
225 | align = 1ul << bit; | |
226 | } | |
227 | addr = ALIGN(start, align); | |
228 | size = PAGE_ALIGN(size); | |
31be8309 OH |
229 | if (unlikely(!size)) |
230 | return NULL; | |
1da177e4 | 231 | |
6cb06229 CL |
232 | area = kmalloc_node(sizeof(*area), gfp_mask & GFP_RECLAIM_MASK, node); |
233 | ||
1da177e4 LT |
234 | if (unlikely(!area)) |
235 | return NULL; | |
236 | ||
1da177e4 LT |
237 | /* |
238 | * We always allocate a guard page. | |
239 | */ | |
240 | size += PAGE_SIZE; | |
241 | ||
242 | write_lock(&vmlist_lock); | |
243 | for (p = &vmlist; (tmp = *p) != NULL ;p = &tmp->next) { | |
244 | if ((unsigned long)tmp->addr < addr) { | |
245 | if((unsigned long)tmp->addr + tmp->size >= addr) | |
246 | addr = ALIGN(tmp->size + | |
247 | (unsigned long)tmp->addr, align); | |
248 | continue; | |
249 | } | |
250 | if ((size + addr) < addr) | |
251 | goto out; | |
252 | if (size + addr <= (unsigned long)tmp->addr) | |
253 | goto found; | |
254 | addr = ALIGN(tmp->size + (unsigned long)tmp->addr, align); | |
255 | if (addr > end - size) | |
256 | goto out; | |
257 | } | |
5dc33185 RB |
258 | if ((size + addr) < addr) |
259 | goto out; | |
260 | if (addr > end - size) | |
261 | goto out; | |
1da177e4 LT |
262 | |
263 | found: | |
264 | area->next = *p; | |
265 | *p = area; | |
266 | ||
267 | area->flags = flags; | |
268 | area->addr = (void *)addr; | |
269 | area->size = size; | |
270 | area->pages = NULL; | |
271 | area->nr_pages = 0; | |
272 | area->phys_addr = 0; | |
23016969 | 273 | area->caller = caller; |
1da177e4 LT |
274 | write_unlock(&vmlist_lock); |
275 | ||
276 | return area; | |
277 | ||
278 | out: | |
279 | write_unlock(&vmlist_lock); | |
280 | kfree(area); | |
281 | if (printk_ratelimit()) | |
282 | printk(KERN_WARNING "allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.\n"); | |
283 | return NULL; | |
284 | } | |
285 | ||
930fc45a CL |
286 | struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, |
287 | unsigned long start, unsigned long end) | |
288 | { | |
23016969 CL |
289 | return __get_vm_area_node(size, flags, start, end, -1, GFP_KERNEL, |
290 | __builtin_return_address(0)); | |
930fc45a | 291 | } |
5992b6da | 292 | EXPORT_SYMBOL_GPL(__get_vm_area); |
930fc45a | 293 | |
1da177e4 | 294 | /** |
183ff22b | 295 | * get_vm_area - reserve a contiguous kernel virtual area |
1da177e4 LT |
296 | * @size: size of the area |
297 | * @flags: %VM_IOREMAP for I/O mappings or VM_ALLOC | |
298 | * | |
299 | * Search an area of @size in the kernel virtual mapping area, | |
300 | * and reserved it for out purposes. Returns the area descriptor | |
301 | * on success or %NULL on failure. | |
302 | */ | |
303 | struct vm_struct *get_vm_area(unsigned long size, unsigned long flags) | |
304 | { | |
23016969 CL |
305 | return __get_vm_area_node(size, flags, VMALLOC_START, VMALLOC_END, |
306 | -1, GFP_KERNEL, __builtin_return_address(0)); | |
307 | } | |
308 | ||
309 | struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags, | |
310 | void *caller) | |
311 | { | |
312 | return __get_vm_area_node(size, flags, VMALLOC_START, VMALLOC_END, | |
313 | -1, GFP_KERNEL, caller); | |
1da177e4 LT |
314 | } |
315 | ||
52fd24ca GP |
316 | struct vm_struct *get_vm_area_node(unsigned long size, unsigned long flags, |
317 | int node, gfp_t gfp_mask) | |
930fc45a | 318 | { |
52fd24ca | 319 | return __get_vm_area_node(size, flags, VMALLOC_START, VMALLOC_END, node, |
23016969 | 320 | gfp_mask, __builtin_return_address(0)); |
930fc45a CL |
321 | } |
322 | ||
83342314 | 323 | /* Caller must hold vmlist_lock */ |
b3bdda02 | 324 | static struct vm_struct *__find_vm_area(const void *addr) |
83342314 NP |
325 | { |
326 | struct vm_struct *tmp; | |
327 | ||
328 | for (tmp = vmlist; tmp != NULL; tmp = tmp->next) { | |
329 | if (tmp->addr == addr) | |
330 | break; | |
331 | } | |
332 | ||
333 | return tmp; | |
334 | } | |
335 | ||
7856dfeb | 336 | /* Caller must hold vmlist_lock */ |
b3bdda02 | 337 | static struct vm_struct *__remove_vm_area(const void *addr) |
1da177e4 LT |
338 | { |
339 | struct vm_struct **p, *tmp; | |
340 | ||
1da177e4 LT |
341 | for (p = &vmlist ; (tmp = *p) != NULL ;p = &tmp->next) { |
342 | if (tmp->addr == addr) | |
343 | goto found; | |
344 | } | |
1da177e4 LT |
345 | return NULL; |
346 | ||
347 | found: | |
348 | unmap_vm_area(tmp); | |
349 | *p = tmp->next; | |
1da177e4 LT |
350 | |
351 | /* | |
352 | * Remove the guard page. | |
353 | */ | |
354 | tmp->size -= PAGE_SIZE; | |
355 | return tmp; | |
356 | } | |
357 | ||
7856dfeb | 358 | /** |
183ff22b | 359 | * remove_vm_area - find and remove a continuous kernel virtual area |
7856dfeb AK |
360 | * @addr: base address |
361 | * | |
362 | * Search for the kernel VM area starting at @addr, and remove it. | |
363 | * This function returns the found VM area, but using it is NOT safe | |
364 | * on SMP machines, except for its size or flags. | |
365 | */ | |
b3bdda02 | 366 | struct vm_struct *remove_vm_area(const void *addr) |
7856dfeb AK |
367 | { |
368 | struct vm_struct *v; | |
369 | write_lock(&vmlist_lock); | |
370 | v = __remove_vm_area(addr); | |
371 | write_unlock(&vmlist_lock); | |
372 | return v; | |
373 | } | |
374 | ||
b3bdda02 | 375 | static void __vunmap(const void *addr, int deallocate_pages) |
1da177e4 LT |
376 | { |
377 | struct vm_struct *area; | |
378 | ||
379 | if (!addr) | |
380 | return; | |
381 | ||
382 | if ((PAGE_SIZE-1) & (unsigned long)addr) { | |
383 | printk(KERN_ERR "Trying to vfree() bad address (%p)\n", addr); | |
384 | WARN_ON(1); | |
385 | return; | |
386 | } | |
387 | ||
388 | area = remove_vm_area(addr); | |
389 | if (unlikely(!area)) { | |
390 | printk(KERN_ERR "Trying to vfree() nonexistent vm area (%p)\n", | |
391 | addr); | |
392 | WARN_ON(1); | |
393 | return; | |
394 | } | |
395 | ||
9a11b49a IM |
396 | debug_check_no_locks_freed(addr, area->size); |
397 | ||
1da177e4 LT |
398 | if (deallocate_pages) { |
399 | int i; | |
400 | ||
401 | for (i = 0; i < area->nr_pages; i++) { | |
bf53d6f8 CL |
402 | struct page *page = area->pages[i]; |
403 | ||
404 | BUG_ON(!page); | |
405 | __free_page(page); | |
1da177e4 LT |
406 | } |
407 | ||
8757d5fa | 408 | if (area->flags & VM_VPAGES) |
1da177e4 LT |
409 | vfree(area->pages); |
410 | else | |
411 | kfree(area->pages); | |
412 | } | |
413 | ||
414 | kfree(area); | |
415 | return; | |
416 | } | |
417 | ||
418 | /** | |
419 | * vfree - release memory allocated by vmalloc() | |
1da177e4 LT |
420 | * @addr: memory base address |
421 | * | |
183ff22b | 422 | * Free the virtually continuous memory area starting at @addr, as |
80e93eff PE |
423 | * obtained from vmalloc(), vmalloc_32() or __vmalloc(). If @addr is |
424 | * NULL, no operation is performed. | |
1da177e4 | 425 | * |
80e93eff | 426 | * Must not be called in interrupt context. |
1da177e4 | 427 | */ |
b3bdda02 | 428 | void vfree(const void *addr) |
1da177e4 LT |
429 | { |
430 | BUG_ON(in_interrupt()); | |
431 | __vunmap(addr, 1); | |
432 | } | |
1da177e4 LT |
433 | EXPORT_SYMBOL(vfree); |
434 | ||
435 | /** | |
436 | * vunmap - release virtual mapping obtained by vmap() | |
1da177e4 LT |
437 | * @addr: memory base address |
438 | * | |
439 | * Free the virtually contiguous memory area starting at @addr, | |
440 | * which was created from the page array passed to vmap(). | |
441 | * | |
80e93eff | 442 | * Must not be called in interrupt context. |
1da177e4 | 443 | */ |
b3bdda02 | 444 | void vunmap(const void *addr) |
1da177e4 LT |
445 | { |
446 | BUG_ON(in_interrupt()); | |
447 | __vunmap(addr, 0); | |
448 | } | |
1da177e4 LT |
449 | EXPORT_SYMBOL(vunmap); |
450 | ||
451 | /** | |
452 | * vmap - map an array of pages into virtually contiguous space | |
1da177e4 LT |
453 | * @pages: array of page pointers |
454 | * @count: number of pages to map | |
455 | * @flags: vm_area->flags | |
456 | * @prot: page protection for the mapping | |
457 | * | |
458 | * Maps @count pages from @pages into contiguous kernel virtual | |
459 | * space. | |
460 | */ | |
461 | void *vmap(struct page **pages, unsigned int count, | |
462 | unsigned long flags, pgprot_t prot) | |
463 | { | |
464 | struct vm_struct *area; | |
465 | ||
466 | if (count > num_physpages) | |
467 | return NULL; | |
468 | ||
23016969 CL |
469 | area = get_vm_area_caller((count << PAGE_SHIFT), flags, |
470 | __builtin_return_address(0)); | |
1da177e4 LT |
471 | if (!area) |
472 | return NULL; | |
23016969 | 473 | |
1da177e4 LT |
474 | if (map_vm_area(area, prot, &pages)) { |
475 | vunmap(area->addr); | |
476 | return NULL; | |
477 | } | |
478 | ||
479 | return area->addr; | |
480 | } | |
1da177e4 LT |
481 | EXPORT_SYMBOL(vmap); |
482 | ||
e31d9eb5 | 483 | static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, |
23016969 | 484 | pgprot_t prot, int node, void *caller) |
1da177e4 LT |
485 | { |
486 | struct page **pages; | |
487 | unsigned int nr_pages, array_size, i; | |
488 | ||
489 | nr_pages = (area->size - PAGE_SIZE) >> PAGE_SHIFT; | |
490 | array_size = (nr_pages * sizeof(struct page *)); | |
491 | ||
492 | area->nr_pages = nr_pages; | |
493 | /* Please note that the recursion is strictly bounded. */ | |
8757d5fa | 494 | if (array_size > PAGE_SIZE) { |
94f6030c | 495 | pages = __vmalloc_node(array_size, gfp_mask | __GFP_ZERO, |
23016969 | 496 | PAGE_KERNEL, node, caller); |
8757d5fa | 497 | area->flags |= VM_VPAGES; |
286e1ea3 AM |
498 | } else { |
499 | pages = kmalloc_node(array_size, | |
6cb06229 | 500 | (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO, |
286e1ea3 AM |
501 | node); |
502 | } | |
1da177e4 | 503 | area->pages = pages; |
23016969 | 504 | area->caller = caller; |
1da177e4 LT |
505 | if (!area->pages) { |
506 | remove_vm_area(area->addr); | |
507 | kfree(area); | |
508 | return NULL; | |
509 | } | |
1da177e4 LT |
510 | |
511 | for (i = 0; i < area->nr_pages; i++) { | |
bf53d6f8 CL |
512 | struct page *page; |
513 | ||
930fc45a | 514 | if (node < 0) |
bf53d6f8 | 515 | page = alloc_page(gfp_mask); |
930fc45a | 516 | else |
bf53d6f8 CL |
517 | page = alloc_pages_node(node, gfp_mask, 0); |
518 | ||
519 | if (unlikely(!page)) { | |
1da177e4 LT |
520 | /* Successfully allocated i pages, free them in __vunmap() */ |
521 | area->nr_pages = i; | |
522 | goto fail; | |
523 | } | |
bf53d6f8 | 524 | area->pages[i] = page; |
1da177e4 LT |
525 | } |
526 | ||
527 | if (map_vm_area(area, prot, &pages)) | |
528 | goto fail; | |
529 | return area->addr; | |
530 | ||
531 | fail: | |
532 | vfree(area->addr); | |
533 | return NULL; | |
534 | } | |
535 | ||
930fc45a CL |
536 | void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask, pgprot_t prot) |
537 | { | |
23016969 CL |
538 | return __vmalloc_area_node(area, gfp_mask, prot, -1, |
539 | __builtin_return_address(0)); | |
930fc45a CL |
540 | } |
541 | ||
1da177e4 | 542 | /** |
930fc45a | 543 | * __vmalloc_node - allocate virtually contiguous memory |
1da177e4 LT |
544 | * @size: allocation size |
545 | * @gfp_mask: flags for the page level allocator | |
546 | * @prot: protection mask for the allocated pages | |
d44e0780 | 547 | * @node: node to use for allocation or -1 |
1da177e4 LT |
548 | * |
549 | * Allocate enough pages to cover @size from the page level | |
550 | * allocator with @gfp_mask flags. Map them into contiguous | |
551 | * kernel virtual space, using a pagetable protection of @prot. | |
552 | */ | |
b221385b | 553 | static void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot, |
23016969 | 554 | int node, void *caller) |
1da177e4 LT |
555 | { |
556 | struct vm_struct *area; | |
557 | ||
558 | size = PAGE_ALIGN(size); | |
559 | if (!size || (size >> PAGE_SHIFT) > num_physpages) | |
560 | return NULL; | |
561 | ||
23016969 CL |
562 | area = __get_vm_area_node(size, VM_ALLOC, VMALLOC_START, VMALLOC_END, |
563 | node, gfp_mask, caller); | |
564 | ||
1da177e4 LT |
565 | if (!area) |
566 | return NULL; | |
567 | ||
23016969 | 568 | return __vmalloc_area_node(area, gfp_mask, prot, node, caller); |
1da177e4 LT |
569 | } |
570 | ||
930fc45a CL |
571 | void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot) |
572 | { | |
23016969 CL |
573 | return __vmalloc_node(size, gfp_mask, prot, -1, |
574 | __builtin_return_address(0)); | |
930fc45a | 575 | } |
1da177e4 LT |
576 | EXPORT_SYMBOL(__vmalloc); |
577 | ||
578 | /** | |
579 | * vmalloc - allocate virtually contiguous memory | |
1da177e4 | 580 | * @size: allocation size |
1da177e4 LT |
581 | * Allocate enough pages to cover @size from the page level |
582 | * allocator and map them into contiguous kernel virtual space. | |
583 | * | |
c1c8897f | 584 | * For tight control over page level allocator and protection flags |
1da177e4 LT |
585 | * use __vmalloc() instead. |
586 | */ | |
587 | void *vmalloc(unsigned long size) | |
588 | { | |
23016969 CL |
589 | return __vmalloc_node(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL, |
590 | -1, __builtin_return_address(0)); | |
1da177e4 | 591 | } |
1da177e4 LT |
592 | EXPORT_SYMBOL(vmalloc); |
593 | ||
83342314 | 594 | /** |
ead04089 REB |
595 | * vmalloc_user - allocate zeroed virtually contiguous memory for userspace |
596 | * @size: allocation size | |
83342314 | 597 | * |
ead04089 REB |
598 | * The resulting memory area is zeroed so it can be mapped to userspace |
599 | * without leaking data. | |
83342314 NP |
600 | */ |
601 | void *vmalloc_user(unsigned long size) | |
602 | { | |
603 | struct vm_struct *area; | |
604 | void *ret; | |
605 | ||
606 | ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); | |
2b4ac44e ED |
607 | if (ret) { |
608 | write_lock(&vmlist_lock); | |
609 | area = __find_vm_area(ret); | |
610 | area->flags |= VM_USERMAP; | |
611 | write_unlock(&vmlist_lock); | |
612 | } | |
83342314 NP |
613 | return ret; |
614 | } | |
615 | EXPORT_SYMBOL(vmalloc_user); | |
616 | ||
930fc45a CL |
617 | /** |
618 | * vmalloc_node - allocate memory on a specific node | |
930fc45a | 619 | * @size: allocation size |
d44e0780 | 620 | * @node: numa node |
930fc45a CL |
621 | * |
622 | * Allocate enough pages to cover @size from the page level | |
623 | * allocator and map them into contiguous kernel virtual space. | |
624 | * | |
c1c8897f | 625 | * For tight control over page level allocator and protection flags |
930fc45a CL |
626 | * use __vmalloc() instead. |
627 | */ | |
628 | void *vmalloc_node(unsigned long size, int node) | |
629 | { | |
23016969 CL |
630 | return __vmalloc_node(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL, |
631 | node, __builtin_return_address(0)); | |
930fc45a CL |
632 | } |
633 | EXPORT_SYMBOL(vmalloc_node); | |
634 | ||
4dc3b16b PP |
635 | #ifndef PAGE_KERNEL_EXEC |
636 | # define PAGE_KERNEL_EXEC PAGE_KERNEL | |
637 | #endif | |
638 | ||
1da177e4 LT |
639 | /** |
640 | * vmalloc_exec - allocate virtually contiguous, executable memory | |
1da177e4 LT |
641 | * @size: allocation size |
642 | * | |
643 | * Kernel-internal function to allocate enough pages to cover @size | |
644 | * the page level allocator and map them into contiguous and | |
645 | * executable kernel virtual space. | |
646 | * | |
c1c8897f | 647 | * For tight control over page level allocator and protection flags |
1da177e4 LT |
648 | * use __vmalloc() instead. |
649 | */ | |
650 | ||
1da177e4 LT |
651 | void *vmalloc_exec(unsigned long size) |
652 | { | |
653 | return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC); | |
654 | } | |
655 | ||
0d08e0d3 | 656 | #if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32) |
7ac674f5 | 657 | #define GFP_VMALLOC32 GFP_DMA32 | GFP_KERNEL |
0d08e0d3 | 658 | #elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA) |
7ac674f5 | 659 | #define GFP_VMALLOC32 GFP_DMA | GFP_KERNEL |
0d08e0d3 AK |
660 | #else |
661 | #define GFP_VMALLOC32 GFP_KERNEL | |
662 | #endif | |
663 | ||
1da177e4 LT |
664 | /** |
665 | * vmalloc_32 - allocate virtually contiguous memory (32bit addressable) | |
1da177e4 LT |
666 | * @size: allocation size |
667 | * | |
668 | * Allocate enough 32bit PA addressable pages to cover @size from the | |
669 | * page level allocator and map them into contiguous kernel virtual space. | |
670 | */ | |
671 | void *vmalloc_32(unsigned long size) | |
672 | { | |
0d08e0d3 | 673 | return __vmalloc(size, GFP_VMALLOC32, PAGE_KERNEL); |
1da177e4 | 674 | } |
1da177e4 LT |
675 | EXPORT_SYMBOL(vmalloc_32); |
676 | ||
83342314 | 677 | /** |
ead04089 | 678 | * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory |
83342314 | 679 | * @size: allocation size |
ead04089 REB |
680 | * |
681 | * The resulting memory area is 32bit addressable and zeroed so it can be | |
682 | * mapped to userspace without leaking data. | |
83342314 NP |
683 | */ |
684 | void *vmalloc_32_user(unsigned long size) | |
685 | { | |
686 | struct vm_struct *area; | |
687 | void *ret; | |
688 | ||
0d08e0d3 | 689 | ret = __vmalloc(size, GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL); |
2b4ac44e ED |
690 | if (ret) { |
691 | write_lock(&vmlist_lock); | |
692 | area = __find_vm_area(ret); | |
693 | area->flags |= VM_USERMAP; | |
694 | write_unlock(&vmlist_lock); | |
695 | } | |
83342314 NP |
696 | return ret; |
697 | } | |
698 | EXPORT_SYMBOL(vmalloc_32_user); | |
699 | ||
1da177e4 LT |
700 | long vread(char *buf, char *addr, unsigned long count) |
701 | { | |
702 | struct vm_struct *tmp; | |
703 | char *vaddr, *buf_start = buf; | |
704 | unsigned long n; | |
705 | ||
706 | /* Don't allow overflow */ | |
707 | if ((unsigned long) addr + count < count) | |
708 | count = -(unsigned long) addr; | |
709 | ||
710 | read_lock(&vmlist_lock); | |
711 | for (tmp = vmlist; tmp; tmp = tmp->next) { | |
712 | vaddr = (char *) tmp->addr; | |
713 | if (addr >= vaddr + tmp->size - PAGE_SIZE) | |
714 | continue; | |
715 | while (addr < vaddr) { | |
716 | if (count == 0) | |
717 | goto finished; | |
718 | *buf = '\0'; | |
719 | buf++; | |
720 | addr++; | |
721 | count--; | |
722 | } | |
723 | n = vaddr + tmp->size - PAGE_SIZE - addr; | |
724 | do { | |
725 | if (count == 0) | |
726 | goto finished; | |
727 | *buf = *addr; | |
728 | buf++; | |
729 | addr++; | |
730 | count--; | |
731 | } while (--n > 0); | |
732 | } | |
733 | finished: | |
734 | read_unlock(&vmlist_lock); | |
735 | return buf - buf_start; | |
736 | } | |
737 | ||
738 | long vwrite(char *buf, char *addr, unsigned long count) | |
739 | { | |
740 | struct vm_struct *tmp; | |
741 | char *vaddr, *buf_start = buf; | |
742 | unsigned long n; | |
743 | ||
744 | /* Don't allow overflow */ | |
745 | if ((unsigned long) addr + count < count) | |
746 | count = -(unsigned long) addr; | |
747 | ||
748 | read_lock(&vmlist_lock); | |
749 | for (tmp = vmlist; tmp; tmp = tmp->next) { | |
750 | vaddr = (char *) tmp->addr; | |
751 | if (addr >= vaddr + tmp->size - PAGE_SIZE) | |
752 | continue; | |
753 | while (addr < vaddr) { | |
754 | if (count == 0) | |
755 | goto finished; | |
756 | buf++; | |
757 | addr++; | |
758 | count--; | |
759 | } | |
760 | n = vaddr + tmp->size - PAGE_SIZE - addr; | |
761 | do { | |
762 | if (count == 0) | |
763 | goto finished; | |
764 | *addr = *buf; | |
765 | buf++; | |
766 | addr++; | |
767 | count--; | |
768 | } while (--n > 0); | |
769 | } | |
770 | finished: | |
771 | read_unlock(&vmlist_lock); | |
772 | return buf - buf_start; | |
773 | } | |
83342314 NP |
774 | |
775 | /** | |
776 | * remap_vmalloc_range - map vmalloc pages to userspace | |
83342314 NP |
777 | * @vma: vma to cover (map full range of vma) |
778 | * @addr: vmalloc memory | |
779 | * @pgoff: number of pages into addr before first page to map | |
7682486b RD |
780 | * |
781 | * Returns: 0 for success, -Exxx on failure | |
83342314 NP |
782 | * |
783 | * This function checks that addr is a valid vmalloc'ed area, and | |
784 | * that it is big enough to cover the vma. Will return failure if | |
785 | * that criteria isn't met. | |
786 | * | |
72fd4a35 | 787 | * Similar to remap_pfn_range() (see mm/memory.c) |
83342314 NP |
788 | */ |
789 | int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, | |
790 | unsigned long pgoff) | |
791 | { | |
792 | struct vm_struct *area; | |
793 | unsigned long uaddr = vma->vm_start; | |
794 | unsigned long usize = vma->vm_end - vma->vm_start; | |
795 | int ret; | |
796 | ||
797 | if ((PAGE_SIZE-1) & (unsigned long)addr) | |
798 | return -EINVAL; | |
799 | ||
800 | read_lock(&vmlist_lock); | |
801 | area = __find_vm_area(addr); | |
802 | if (!area) | |
803 | goto out_einval_locked; | |
804 | ||
805 | if (!(area->flags & VM_USERMAP)) | |
806 | goto out_einval_locked; | |
807 | ||
808 | if (usize + (pgoff << PAGE_SHIFT) > area->size - PAGE_SIZE) | |
809 | goto out_einval_locked; | |
810 | read_unlock(&vmlist_lock); | |
811 | ||
812 | addr += pgoff << PAGE_SHIFT; | |
813 | do { | |
814 | struct page *page = vmalloc_to_page(addr); | |
815 | ret = vm_insert_page(vma, uaddr, page); | |
816 | if (ret) | |
817 | return ret; | |
818 | ||
819 | uaddr += PAGE_SIZE; | |
820 | addr += PAGE_SIZE; | |
821 | usize -= PAGE_SIZE; | |
822 | } while (usize > 0); | |
823 | ||
824 | /* Prevent "things" like memory migration? VM_flags need a cleanup... */ | |
825 | vma->vm_flags |= VM_RESERVED; | |
826 | ||
827 | return ret; | |
828 | ||
829 | out_einval_locked: | |
830 | read_unlock(&vmlist_lock); | |
831 | return -EINVAL; | |
832 | } | |
833 | EXPORT_SYMBOL(remap_vmalloc_range); | |
834 | ||
1eeb66a1 CH |
835 | /* |
836 | * Implement a stub for vmalloc_sync_all() if the architecture chose not to | |
837 | * have one. | |
838 | */ | |
839 | void __attribute__((weak)) vmalloc_sync_all(void) | |
840 | { | |
841 | } | |
5f4352fb JF |
842 | |
843 | ||
2f569afd | 844 | static int f(pte_t *pte, pgtable_t table, unsigned long addr, void *data) |
5f4352fb JF |
845 | { |
846 | /* apply_to_page_range() does all the hard work. */ | |
847 | return 0; | |
848 | } | |
849 | ||
850 | /** | |
851 | * alloc_vm_area - allocate a range of kernel address space | |
852 | * @size: size of the area | |
7682486b RD |
853 | * |
854 | * Returns: NULL on failure, vm_struct on success | |
5f4352fb JF |
855 | * |
856 | * This function reserves a range of kernel address space, and | |
857 | * allocates pagetables to map that range. No actual mappings | |
858 | * are created. If the kernel address space is not shared | |
859 | * between processes, it syncs the pagetable across all | |
860 | * processes. | |
861 | */ | |
862 | struct vm_struct *alloc_vm_area(size_t size) | |
863 | { | |
864 | struct vm_struct *area; | |
865 | ||
23016969 CL |
866 | area = get_vm_area_caller(size, VM_IOREMAP, |
867 | __builtin_return_address(0)); | |
5f4352fb JF |
868 | if (area == NULL) |
869 | return NULL; | |
870 | ||
871 | /* | |
872 | * This ensures that page tables are constructed for this region | |
873 | * of kernel virtual address space and mapped into init_mm. | |
874 | */ | |
875 | if (apply_to_page_range(&init_mm, (unsigned long)area->addr, | |
876 | area->size, f, NULL)) { | |
877 | free_vm_area(area); | |
878 | return NULL; | |
879 | } | |
880 | ||
881 | /* Make sure the pagetables are constructed in process kernel | |
882 | mappings */ | |
883 | vmalloc_sync_all(); | |
884 | ||
885 | return area; | |
886 | } | |
887 | EXPORT_SYMBOL_GPL(alloc_vm_area); | |
888 | ||
889 | void free_vm_area(struct vm_struct *area) | |
890 | { | |
891 | struct vm_struct *ret; | |
892 | ret = remove_vm_area(area->addr); | |
893 | BUG_ON(ret != area); | |
894 | kfree(area); | |
895 | } | |
896 | EXPORT_SYMBOL_GPL(free_vm_area); | |
a10aa579 CL |
897 | |
898 | ||
899 | #ifdef CONFIG_PROC_FS | |
900 | static void *s_start(struct seq_file *m, loff_t *pos) | |
901 | { | |
902 | loff_t n = *pos; | |
903 | struct vm_struct *v; | |
904 | ||
905 | read_lock(&vmlist_lock); | |
906 | v = vmlist; | |
907 | while (n > 0 && v) { | |
908 | n--; | |
909 | v = v->next; | |
910 | } | |
911 | if (!n) | |
912 | return v; | |
913 | ||
914 | return NULL; | |
915 | ||
916 | } | |
917 | ||
918 | static void *s_next(struct seq_file *m, void *p, loff_t *pos) | |
919 | { | |
920 | struct vm_struct *v = p; | |
921 | ||
922 | ++*pos; | |
923 | return v->next; | |
924 | } | |
925 | ||
926 | static void s_stop(struct seq_file *m, void *p) | |
927 | { | |
928 | read_unlock(&vmlist_lock); | |
929 | } | |
930 | ||
931 | static int s_show(struct seq_file *m, void *p) | |
932 | { | |
933 | struct vm_struct *v = p; | |
934 | ||
935 | seq_printf(m, "0x%p-0x%p %7ld", | |
936 | v->addr, v->addr + v->size, v->size); | |
937 | ||
23016969 CL |
938 | if (v->caller) { |
939 | char buff[2 * KSYM_NAME_LEN]; | |
940 | ||
941 | seq_putc(m, ' '); | |
942 | sprint_symbol(buff, (unsigned long)v->caller); | |
943 | seq_puts(m, buff); | |
944 | } | |
945 | ||
a10aa579 CL |
946 | if (v->nr_pages) |
947 | seq_printf(m, " pages=%d", v->nr_pages); | |
948 | ||
949 | if (v->phys_addr) | |
950 | seq_printf(m, " phys=%lx", v->phys_addr); | |
951 | ||
952 | if (v->flags & VM_IOREMAP) | |
953 | seq_printf(m, " ioremap"); | |
954 | ||
955 | if (v->flags & VM_ALLOC) | |
956 | seq_printf(m, " vmalloc"); | |
957 | ||
958 | if (v->flags & VM_MAP) | |
959 | seq_printf(m, " vmap"); | |
960 | ||
961 | if (v->flags & VM_USERMAP) | |
962 | seq_printf(m, " user"); | |
963 | ||
964 | if (v->flags & VM_VPAGES) | |
965 | seq_printf(m, " vpages"); | |
966 | ||
967 | seq_putc(m, '\n'); | |
968 | return 0; | |
969 | } | |
970 | ||
971 | const struct seq_operations vmalloc_op = { | |
972 | .start = s_start, | |
973 | .next = s_next, | |
974 | .stop = s_stop, | |
975 | .show = s_show, | |
976 | }; | |
977 | #endif | |
978 |