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Commit | Line | Data |
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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> | |
17 | ||
18 | #include <linux/vmalloc.h> | |
19 | ||
20 | #include <asm/uaccess.h> | |
21 | #include <asm/tlbflush.h> | |
22 | ||
23 | ||
24 | DEFINE_RWLOCK(vmlist_lock); | |
25 | struct vm_struct *vmlist; | |
26 | ||
b221385b AB |
27 | static void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot, |
28 | int node); | |
29 | ||
1da177e4 LT |
30 | static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end) |
31 | { | |
32 | pte_t *pte; | |
33 | ||
34 | pte = pte_offset_kernel(pmd, addr); | |
35 | do { | |
36 | pte_t ptent = ptep_get_and_clear(&init_mm, addr, pte); | |
37 | WARN_ON(!pte_none(ptent) && !pte_present(ptent)); | |
38 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
39 | } | |
40 | ||
41 | static inline void vunmap_pmd_range(pud_t *pud, unsigned long addr, | |
42 | unsigned long end) | |
43 | { | |
44 | pmd_t *pmd; | |
45 | unsigned long next; | |
46 | ||
47 | pmd = pmd_offset(pud, addr); | |
48 | do { | |
49 | next = pmd_addr_end(addr, end); | |
50 | if (pmd_none_or_clear_bad(pmd)) | |
51 | continue; | |
52 | vunmap_pte_range(pmd, addr, next); | |
53 | } while (pmd++, addr = next, addr != end); | |
54 | } | |
55 | ||
56 | static inline void vunmap_pud_range(pgd_t *pgd, unsigned long addr, | |
57 | unsigned long end) | |
58 | { | |
59 | pud_t *pud; | |
60 | unsigned long next; | |
61 | ||
62 | pud = pud_offset(pgd, addr); | |
63 | do { | |
64 | next = pud_addr_end(addr, end); | |
65 | if (pud_none_or_clear_bad(pud)) | |
66 | continue; | |
67 | vunmap_pmd_range(pud, addr, next); | |
68 | } while (pud++, addr = next, addr != end); | |
69 | } | |
70 | ||
c19c03fc | 71 | void unmap_kernel_range(unsigned long addr, unsigned long size) |
1da177e4 LT |
72 | { |
73 | pgd_t *pgd; | |
74 | unsigned long next; | |
c19c03fc BH |
75 | unsigned long start = addr; |
76 | unsigned long end = addr + size; | |
1da177e4 LT |
77 | |
78 | BUG_ON(addr >= end); | |
79 | pgd = pgd_offset_k(addr); | |
80 | flush_cache_vunmap(addr, end); | |
81 | do { | |
82 | next = pgd_addr_end(addr, end); | |
83 | if (pgd_none_or_clear_bad(pgd)) | |
84 | continue; | |
85 | vunmap_pud_range(pgd, addr, next); | |
86 | } while (pgd++, addr = next, addr != end); | |
c19c03fc BH |
87 | flush_tlb_kernel_range(start, end); |
88 | } | |
89 | ||
90 | static void unmap_vm_area(struct vm_struct *area) | |
91 | { | |
92 | unmap_kernel_range((unsigned long)area->addr, area->size); | |
1da177e4 LT |
93 | } |
94 | ||
95 | static int vmap_pte_range(pmd_t *pmd, unsigned long addr, | |
96 | unsigned long end, pgprot_t prot, struct page ***pages) | |
97 | { | |
98 | pte_t *pte; | |
99 | ||
872fec16 | 100 | pte = pte_alloc_kernel(pmd, addr); |
1da177e4 LT |
101 | if (!pte) |
102 | return -ENOMEM; | |
103 | do { | |
104 | struct page *page = **pages; | |
105 | WARN_ON(!pte_none(*pte)); | |
106 | if (!page) | |
107 | return -ENOMEM; | |
108 | set_pte_at(&init_mm, addr, pte, mk_pte(page, prot)); | |
109 | (*pages)++; | |
110 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static inline int vmap_pmd_range(pud_t *pud, unsigned long addr, | |
115 | unsigned long end, pgprot_t prot, struct page ***pages) | |
116 | { | |
117 | pmd_t *pmd; | |
118 | unsigned long next; | |
119 | ||
120 | pmd = pmd_alloc(&init_mm, pud, addr); | |
121 | if (!pmd) | |
122 | return -ENOMEM; | |
123 | do { | |
124 | next = pmd_addr_end(addr, end); | |
125 | if (vmap_pte_range(pmd, addr, next, prot, pages)) | |
126 | return -ENOMEM; | |
127 | } while (pmd++, addr = next, addr != end); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static inline int vmap_pud_range(pgd_t *pgd, unsigned long addr, | |
132 | unsigned long end, pgprot_t prot, struct page ***pages) | |
133 | { | |
134 | pud_t *pud; | |
135 | unsigned long next; | |
136 | ||
137 | pud = pud_alloc(&init_mm, pgd, addr); | |
138 | if (!pud) | |
139 | return -ENOMEM; | |
140 | do { | |
141 | next = pud_addr_end(addr, end); | |
142 | if (vmap_pmd_range(pud, addr, next, prot, pages)) | |
143 | return -ENOMEM; | |
144 | } while (pud++, addr = next, addr != end); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages) | |
149 | { | |
150 | pgd_t *pgd; | |
151 | unsigned long next; | |
152 | unsigned long addr = (unsigned long) area->addr; | |
153 | unsigned long end = addr + area->size - PAGE_SIZE; | |
154 | int err; | |
155 | ||
156 | BUG_ON(addr >= end); | |
157 | pgd = pgd_offset_k(addr); | |
1da177e4 LT |
158 | do { |
159 | next = pgd_addr_end(addr, end); | |
160 | err = vmap_pud_range(pgd, addr, next, prot, pages); | |
161 | if (err) | |
162 | break; | |
163 | } while (pgd++, addr = next, addr != end); | |
1da177e4 LT |
164 | flush_cache_vmap((unsigned long) area->addr, end); |
165 | return err; | |
166 | } | |
5992b6da | 167 | EXPORT_SYMBOL_GPL(map_vm_area); |
1da177e4 | 168 | |
52fd24ca GP |
169 | static struct vm_struct *__get_vm_area_node(unsigned long size, unsigned long flags, |
170 | unsigned long start, unsigned long end, | |
171 | int node, gfp_t gfp_mask) | |
1da177e4 LT |
172 | { |
173 | struct vm_struct **p, *tmp, *area; | |
174 | unsigned long align = 1; | |
175 | unsigned long addr; | |
176 | ||
52fd24ca | 177 | BUG_ON(in_interrupt()); |
1da177e4 LT |
178 | if (flags & VM_IOREMAP) { |
179 | int bit = fls(size); | |
180 | ||
181 | if (bit > IOREMAP_MAX_ORDER) | |
182 | bit = IOREMAP_MAX_ORDER; | |
183 | else if (bit < PAGE_SHIFT) | |
184 | bit = PAGE_SHIFT; | |
185 | ||
186 | align = 1ul << bit; | |
187 | } | |
188 | addr = ALIGN(start, align); | |
189 | size = PAGE_ALIGN(size); | |
31be8309 OH |
190 | if (unlikely(!size)) |
191 | return NULL; | |
1da177e4 | 192 | |
5211e6e6 | 193 | area = kmalloc_node(sizeof(*area), gfp_mask & GFP_LEVEL_MASK, node); |
1da177e4 LT |
194 | if (unlikely(!area)) |
195 | return NULL; | |
196 | ||
1da177e4 LT |
197 | /* |
198 | * We always allocate a guard page. | |
199 | */ | |
200 | size += PAGE_SIZE; | |
201 | ||
202 | write_lock(&vmlist_lock); | |
203 | for (p = &vmlist; (tmp = *p) != NULL ;p = &tmp->next) { | |
204 | if ((unsigned long)tmp->addr < addr) { | |
205 | if((unsigned long)tmp->addr + tmp->size >= addr) | |
206 | addr = ALIGN(tmp->size + | |
207 | (unsigned long)tmp->addr, align); | |
208 | continue; | |
209 | } | |
210 | if ((size + addr) < addr) | |
211 | goto out; | |
212 | if (size + addr <= (unsigned long)tmp->addr) | |
213 | goto found; | |
214 | addr = ALIGN(tmp->size + (unsigned long)tmp->addr, align); | |
215 | if (addr > end - size) | |
216 | goto out; | |
217 | } | |
218 | ||
219 | found: | |
220 | area->next = *p; | |
221 | *p = area; | |
222 | ||
223 | area->flags = flags; | |
224 | area->addr = (void *)addr; | |
225 | area->size = size; | |
226 | area->pages = NULL; | |
227 | area->nr_pages = 0; | |
228 | area->phys_addr = 0; | |
229 | write_unlock(&vmlist_lock); | |
230 | ||
231 | return area; | |
232 | ||
233 | out: | |
234 | write_unlock(&vmlist_lock); | |
235 | kfree(area); | |
236 | if (printk_ratelimit()) | |
237 | printk(KERN_WARNING "allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.\n"); | |
238 | return NULL; | |
239 | } | |
240 | ||
930fc45a CL |
241 | struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, |
242 | unsigned long start, unsigned long end) | |
243 | { | |
52fd24ca | 244 | return __get_vm_area_node(size, flags, start, end, -1, GFP_KERNEL); |
930fc45a | 245 | } |
5992b6da | 246 | EXPORT_SYMBOL_GPL(__get_vm_area); |
930fc45a | 247 | |
1da177e4 LT |
248 | /** |
249 | * get_vm_area - reserve a contingous kernel virtual area | |
1da177e4 LT |
250 | * @size: size of the area |
251 | * @flags: %VM_IOREMAP for I/O mappings or VM_ALLOC | |
252 | * | |
253 | * Search an area of @size in the kernel virtual mapping area, | |
254 | * and reserved it for out purposes. Returns the area descriptor | |
255 | * on success or %NULL on failure. | |
256 | */ | |
257 | struct vm_struct *get_vm_area(unsigned long size, unsigned long flags) | |
258 | { | |
259 | return __get_vm_area(size, flags, VMALLOC_START, VMALLOC_END); | |
260 | } | |
261 | ||
52fd24ca GP |
262 | struct vm_struct *get_vm_area_node(unsigned long size, unsigned long flags, |
263 | int node, gfp_t gfp_mask) | |
930fc45a | 264 | { |
52fd24ca GP |
265 | return __get_vm_area_node(size, flags, VMALLOC_START, VMALLOC_END, node, |
266 | gfp_mask); | |
930fc45a CL |
267 | } |
268 | ||
83342314 NP |
269 | /* Caller must hold vmlist_lock */ |
270 | static struct vm_struct *__find_vm_area(void *addr) | |
271 | { | |
272 | struct vm_struct *tmp; | |
273 | ||
274 | for (tmp = vmlist; tmp != NULL; tmp = tmp->next) { | |
275 | if (tmp->addr == addr) | |
276 | break; | |
277 | } | |
278 | ||
279 | return tmp; | |
280 | } | |
281 | ||
7856dfeb | 282 | /* Caller must hold vmlist_lock */ |
d24afc57 | 283 | static struct vm_struct *__remove_vm_area(void *addr) |
1da177e4 LT |
284 | { |
285 | struct vm_struct **p, *tmp; | |
286 | ||
1da177e4 LT |
287 | for (p = &vmlist ; (tmp = *p) != NULL ;p = &tmp->next) { |
288 | if (tmp->addr == addr) | |
289 | goto found; | |
290 | } | |
1da177e4 LT |
291 | return NULL; |
292 | ||
293 | found: | |
294 | unmap_vm_area(tmp); | |
295 | *p = tmp->next; | |
1da177e4 LT |
296 | |
297 | /* | |
298 | * Remove the guard page. | |
299 | */ | |
300 | tmp->size -= PAGE_SIZE; | |
301 | return tmp; | |
302 | } | |
303 | ||
7856dfeb AK |
304 | /** |
305 | * remove_vm_area - find and remove a contingous kernel virtual area | |
7856dfeb AK |
306 | * @addr: base address |
307 | * | |
308 | * Search for the kernel VM area starting at @addr, and remove it. | |
309 | * This function returns the found VM area, but using it is NOT safe | |
310 | * on SMP machines, except for its size or flags. | |
311 | */ | |
312 | struct vm_struct *remove_vm_area(void *addr) | |
313 | { | |
314 | struct vm_struct *v; | |
315 | write_lock(&vmlist_lock); | |
316 | v = __remove_vm_area(addr); | |
317 | write_unlock(&vmlist_lock); | |
318 | return v; | |
319 | } | |
320 | ||
d55e2ca8 | 321 | static void __vunmap(void *addr, int deallocate_pages) |
1da177e4 LT |
322 | { |
323 | struct vm_struct *area; | |
324 | ||
325 | if (!addr) | |
326 | return; | |
327 | ||
328 | if ((PAGE_SIZE-1) & (unsigned long)addr) { | |
329 | printk(KERN_ERR "Trying to vfree() bad address (%p)\n", addr); | |
330 | WARN_ON(1); | |
331 | return; | |
332 | } | |
333 | ||
334 | area = remove_vm_area(addr); | |
335 | if (unlikely(!area)) { | |
336 | printk(KERN_ERR "Trying to vfree() nonexistent vm area (%p)\n", | |
337 | addr); | |
338 | WARN_ON(1); | |
339 | return; | |
340 | } | |
341 | ||
9a11b49a IM |
342 | debug_check_no_locks_freed(addr, area->size); |
343 | ||
1da177e4 LT |
344 | if (deallocate_pages) { |
345 | int i; | |
346 | ||
347 | for (i = 0; i < area->nr_pages; i++) { | |
5aae277e | 348 | BUG_ON(!area->pages[i]); |
1da177e4 LT |
349 | __free_page(area->pages[i]); |
350 | } | |
351 | ||
8757d5fa | 352 | if (area->flags & VM_VPAGES) |
1da177e4 LT |
353 | vfree(area->pages); |
354 | else | |
355 | kfree(area->pages); | |
356 | } | |
357 | ||
358 | kfree(area); | |
359 | return; | |
360 | } | |
361 | ||
362 | /** | |
363 | * vfree - release memory allocated by vmalloc() | |
1da177e4 LT |
364 | * @addr: memory base address |
365 | * | |
366 | * Free the virtually contiguous memory area starting at @addr, as | |
80e93eff PE |
367 | * obtained from vmalloc(), vmalloc_32() or __vmalloc(). If @addr is |
368 | * NULL, no operation is performed. | |
1da177e4 | 369 | * |
80e93eff | 370 | * Must not be called in interrupt context. |
1da177e4 LT |
371 | */ |
372 | void vfree(void *addr) | |
373 | { | |
374 | BUG_ON(in_interrupt()); | |
375 | __vunmap(addr, 1); | |
376 | } | |
1da177e4 LT |
377 | EXPORT_SYMBOL(vfree); |
378 | ||
379 | /** | |
380 | * vunmap - release virtual mapping obtained by vmap() | |
1da177e4 LT |
381 | * @addr: memory base address |
382 | * | |
383 | * Free the virtually contiguous memory area starting at @addr, | |
384 | * which was created from the page array passed to vmap(). | |
385 | * | |
80e93eff | 386 | * Must not be called in interrupt context. |
1da177e4 LT |
387 | */ |
388 | void vunmap(void *addr) | |
389 | { | |
390 | BUG_ON(in_interrupt()); | |
391 | __vunmap(addr, 0); | |
392 | } | |
1da177e4 LT |
393 | EXPORT_SYMBOL(vunmap); |
394 | ||
395 | /** | |
396 | * vmap - map an array of pages into virtually contiguous space | |
1da177e4 LT |
397 | * @pages: array of page pointers |
398 | * @count: number of pages to map | |
399 | * @flags: vm_area->flags | |
400 | * @prot: page protection for the mapping | |
401 | * | |
402 | * Maps @count pages from @pages into contiguous kernel virtual | |
403 | * space. | |
404 | */ | |
405 | void *vmap(struct page **pages, unsigned int count, | |
406 | unsigned long flags, pgprot_t prot) | |
407 | { | |
408 | struct vm_struct *area; | |
409 | ||
410 | if (count > num_physpages) | |
411 | return NULL; | |
412 | ||
413 | area = get_vm_area((count << PAGE_SHIFT), flags); | |
414 | if (!area) | |
415 | return NULL; | |
416 | if (map_vm_area(area, prot, &pages)) { | |
417 | vunmap(area->addr); | |
418 | return NULL; | |
419 | } | |
420 | ||
421 | return area->addr; | |
422 | } | |
1da177e4 LT |
423 | EXPORT_SYMBOL(vmap); |
424 | ||
930fc45a CL |
425 | void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, |
426 | pgprot_t prot, int node) | |
1da177e4 LT |
427 | { |
428 | struct page **pages; | |
429 | unsigned int nr_pages, array_size, i; | |
430 | ||
431 | nr_pages = (area->size - PAGE_SIZE) >> PAGE_SHIFT; | |
432 | array_size = (nr_pages * sizeof(struct page *)); | |
433 | ||
434 | area->nr_pages = nr_pages; | |
435 | /* Please note that the recursion is strictly bounded. */ | |
8757d5fa | 436 | if (array_size > PAGE_SIZE) { |
94f6030c CL |
437 | pages = __vmalloc_node(array_size, gfp_mask | __GFP_ZERO, |
438 | PAGE_KERNEL, node); | |
8757d5fa | 439 | area->flags |= VM_VPAGES; |
286e1ea3 AM |
440 | } else { |
441 | pages = kmalloc_node(array_size, | |
94f6030c | 442 | (gfp_mask & GFP_LEVEL_MASK) | __GFP_ZERO, |
286e1ea3 AM |
443 | node); |
444 | } | |
1da177e4 LT |
445 | area->pages = pages; |
446 | if (!area->pages) { | |
447 | remove_vm_area(area->addr); | |
448 | kfree(area); | |
449 | return NULL; | |
450 | } | |
1da177e4 LT |
451 | |
452 | for (i = 0; i < area->nr_pages; i++) { | |
930fc45a CL |
453 | if (node < 0) |
454 | area->pages[i] = alloc_page(gfp_mask); | |
455 | else | |
456 | area->pages[i] = alloc_pages_node(node, gfp_mask, 0); | |
1da177e4 LT |
457 | if (unlikely(!area->pages[i])) { |
458 | /* Successfully allocated i pages, free them in __vunmap() */ | |
459 | area->nr_pages = i; | |
460 | goto fail; | |
461 | } | |
462 | } | |
463 | ||
464 | if (map_vm_area(area, prot, &pages)) | |
465 | goto fail; | |
466 | return area->addr; | |
467 | ||
468 | fail: | |
469 | vfree(area->addr); | |
470 | return NULL; | |
471 | } | |
472 | ||
930fc45a CL |
473 | void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask, pgprot_t prot) |
474 | { | |
475 | return __vmalloc_area_node(area, gfp_mask, prot, -1); | |
476 | } | |
477 | ||
1da177e4 | 478 | /** |
930fc45a | 479 | * __vmalloc_node - allocate virtually contiguous memory |
1da177e4 LT |
480 | * @size: allocation size |
481 | * @gfp_mask: flags for the page level allocator | |
482 | * @prot: protection mask for the allocated pages | |
d44e0780 | 483 | * @node: node to use for allocation or -1 |
1da177e4 LT |
484 | * |
485 | * Allocate enough pages to cover @size from the page level | |
486 | * allocator with @gfp_mask flags. Map them into contiguous | |
487 | * kernel virtual space, using a pagetable protection of @prot. | |
488 | */ | |
b221385b AB |
489 | static void *__vmalloc_node(unsigned long size, gfp_t gfp_mask, pgprot_t prot, |
490 | int node) | |
1da177e4 LT |
491 | { |
492 | struct vm_struct *area; | |
493 | ||
494 | size = PAGE_ALIGN(size); | |
495 | if (!size || (size >> PAGE_SHIFT) > num_physpages) | |
496 | return NULL; | |
497 | ||
52fd24ca | 498 | area = get_vm_area_node(size, VM_ALLOC, node, gfp_mask); |
1da177e4 LT |
499 | if (!area) |
500 | return NULL; | |
501 | ||
930fc45a | 502 | return __vmalloc_area_node(area, gfp_mask, prot, node); |
1da177e4 LT |
503 | } |
504 | ||
930fc45a CL |
505 | void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot) |
506 | { | |
507 | return __vmalloc_node(size, gfp_mask, prot, -1); | |
508 | } | |
1da177e4 LT |
509 | EXPORT_SYMBOL(__vmalloc); |
510 | ||
511 | /** | |
512 | * vmalloc - allocate virtually contiguous memory | |
1da177e4 | 513 | * @size: allocation size |
1da177e4 LT |
514 | * Allocate enough pages to cover @size from the page level |
515 | * allocator and map them into contiguous kernel virtual space. | |
516 | * | |
c1c8897f | 517 | * For tight control over page level allocator and protection flags |
1da177e4 LT |
518 | * use __vmalloc() instead. |
519 | */ | |
520 | void *vmalloc(unsigned long size) | |
521 | { | |
83342314 | 522 | return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL); |
1da177e4 | 523 | } |
1da177e4 LT |
524 | EXPORT_SYMBOL(vmalloc); |
525 | ||
83342314 | 526 | /** |
ead04089 REB |
527 | * vmalloc_user - allocate zeroed virtually contiguous memory for userspace |
528 | * @size: allocation size | |
83342314 | 529 | * |
ead04089 REB |
530 | * The resulting memory area is zeroed so it can be mapped to userspace |
531 | * without leaking data. | |
83342314 NP |
532 | */ |
533 | void *vmalloc_user(unsigned long size) | |
534 | { | |
535 | struct vm_struct *area; | |
536 | void *ret; | |
537 | ||
538 | ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); | |
2b4ac44e ED |
539 | if (ret) { |
540 | write_lock(&vmlist_lock); | |
541 | area = __find_vm_area(ret); | |
542 | area->flags |= VM_USERMAP; | |
543 | write_unlock(&vmlist_lock); | |
544 | } | |
83342314 NP |
545 | return ret; |
546 | } | |
547 | EXPORT_SYMBOL(vmalloc_user); | |
548 | ||
930fc45a CL |
549 | /** |
550 | * vmalloc_node - allocate memory on a specific node | |
930fc45a | 551 | * @size: allocation size |
d44e0780 | 552 | * @node: numa node |
930fc45a CL |
553 | * |
554 | * Allocate enough pages to cover @size from the page level | |
555 | * allocator and map them into contiguous kernel virtual space. | |
556 | * | |
c1c8897f | 557 | * For tight control over page level allocator and protection flags |
930fc45a CL |
558 | * use __vmalloc() instead. |
559 | */ | |
560 | void *vmalloc_node(unsigned long size, int node) | |
561 | { | |
83342314 | 562 | return __vmalloc_node(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL, node); |
930fc45a CL |
563 | } |
564 | EXPORT_SYMBOL(vmalloc_node); | |
565 | ||
4dc3b16b PP |
566 | #ifndef PAGE_KERNEL_EXEC |
567 | # define PAGE_KERNEL_EXEC PAGE_KERNEL | |
568 | #endif | |
569 | ||
1da177e4 LT |
570 | /** |
571 | * vmalloc_exec - allocate virtually contiguous, executable memory | |
1da177e4 LT |
572 | * @size: allocation size |
573 | * | |
574 | * Kernel-internal function to allocate enough pages to cover @size | |
575 | * the page level allocator and map them into contiguous and | |
576 | * executable kernel virtual space. | |
577 | * | |
c1c8897f | 578 | * For tight control over page level allocator and protection flags |
1da177e4 LT |
579 | * use __vmalloc() instead. |
580 | */ | |
581 | ||
1da177e4 LT |
582 | void *vmalloc_exec(unsigned long size) |
583 | { | |
584 | return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC); | |
585 | } | |
586 | ||
0d08e0d3 | 587 | #if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32) |
7ac674f5 | 588 | #define GFP_VMALLOC32 GFP_DMA32 | GFP_KERNEL |
0d08e0d3 | 589 | #elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA) |
7ac674f5 | 590 | #define GFP_VMALLOC32 GFP_DMA | GFP_KERNEL |
0d08e0d3 AK |
591 | #else |
592 | #define GFP_VMALLOC32 GFP_KERNEL | |
593 | #endif | |
594 | ||
1da177e4 LT |
595 | /** |
596 | * vmalloc_32 - allocate virtually contiguous memory (32bit addressable) | |
1da177e4 LT |
597 | * @size: allocation size |
598 | * | |
599 | * Allocate enough 32bit PA addressable pages to cover @size from the | |
600 | * page level allocator and map them into contiguous kernel virtual space. | |
601 | */ | |
602 | void *vmalloc_32(unsigned long size) | |
603 | { | |
0d08e0d3 | 604 | return __vmalloc(size, GFP_VMALLOC32, PAGE_KERNEL); |
1da177e4 | 605 | } |
1da177e4 LT |
606 | EXPORT_SYMBOL(vmalloc_32); |
607 | ||
83342314 | 608 | /** |
ead04089 | 609 | * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory |
83342314 | 610 | * @size: allocation size |
ead04089 REB |
611 | * |
612 | * The resulting memory area is 32bit addressable and zeroed so it can be | |
613 | * mapped to userspace without leaking data. | |
83342314 NP |
614 | */ |
615 | void *vmalloc_32_user(unsigned long size) | |
616 | { | |
617 | struct vm_struct *area; | |
618 | void *ret; | |
619 | ||
0d08e0d3 | 620 | ret = __vmalloc(size, GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL); |
2b4ac44e ED |
621 | if (ret) { |
622 | write_lock(&vmlist_lock); | |
623 | area = __find_vm_area(ret); | |
624 | area->flags |= VM_USERMAP; | |
625 | write_unlock(&vmlist_lock); | |
626 | } | |
83342314 NP |
627 | return ret; |
628 | } | |
629 | EXPORT_SYMBOL(vmalloc_32_user); | |
630 | ||
1da177e4 LT |
631 | long vread(char *buf, char *addr, unsigned long count) |
632 | { | |
633 | struct vm_struct *tmp; | |
634 | char *vaddr, *buf_start = buf; | |
635 | unsigned long n; | |
636 | ||
637 | /* Don't allow overflow */ | |
638 | if ((unsigned long) addr + count < count) | |
639 | count = -(unsigned long) addr; | |
640 | ||
641 | read_lock(&vmlist_lock); | |
642 | for (tmp = vmlist; tmp; tmp = tmp->next) { | |
643 | vaddr = (char *) tmp->addr; | |
644 | if (addr >= vaddr + tmp->size - PAGE_SIZE) | |
645 | continue; | |
646 | while (addr < vaddr) { | |
647 | if (count == 0) | |
648 | goto finished; | |
649 | *buf = '\0'; | |
650 | buf++; | |
651 | addr++; | |
652 | count--; | |
653 | } | |
654 | n = vaddr + tmp->size - PAGE_SIZE - addr; | |
655 | do { | |
656 | if (count == 0) | |
657 | goto finished; | |
658 | *buf = *addr; | |
659 | buf++; | |
660 | addr++; | |
661 | count--; | |
662 | } while (--n > 0); | |
663 | } | |
664 | finished: | |
665 | read_unlock(&vmlist_lock); | |
666 | return buf - buf_start; | |
667 | } | |
668 | ||
669 | long vwrite(char *buf, char *addr, unsigned long count) | |
670 | { | |
671 | struct vm_struct *tmp; | |
672 | char *vaddr, *buf_start = buf; | |
673 | unsigned long n; | |
674 | ||
675 | /* Don't allow overflow */ | |
676 | if ((unsigned long) addr + count < count) | |
677 | count = -(unsigned long) addr; | |
678 | ||
679 | read_lock(&vmlist_lock); | |
680 | for (tmp = vmlist; tmp; tmp = tmp->next) { | |
681 | vaddr = (char *) tmp->addr; | |
682 | if (addr >= vaddr + tmp->size - PAGE_SIZE) | |
683 | continue; | |
684 | while (addr < vaddr) { | |
685 | if (count == 0) | |
686 | goto finished; | |
687 | buf++; | |
688 | addr++; | |
689 | count--; | |
690 | } | |
691 | n = vaddr + tmp->size - PAGE_SIZE - addr; | |
692 | do { | |
693 | if (count == 0) | |
694 | goto finished; | |
695 | *addr = *buf; | |
696 | buf++; | |
697 | addr++; | |
698 | count--; | |
699 | } while (--n > 0); | |
700 | } | |
701 | finished: | |
702 | read_unlock(&vmlist_lock); | |
703 | return buf - buf_start; | |
704 | } | |
83342314 NP |
705 | |
706 | /** | |
707 | * remap_vmalloc_range - map vmalloc pages to userspace | |
83342314 NP |
708 | * @vma: vma to cover (map full range of vma) |
709 | * @addr: vmalloc memory | |
710 | * @pgoff: number of pages into addr before first page to map | |
711 | * @returns: 0 for success, -Exxx on failure | |
712 | * | |
713 | * This function checks that addr is a valid vmalloc'ed area, and | |
714 | * that it is big enough to cover the vma. Will return failure if | |
715 | * that criteria isn't met. | |
716 | * | |
72fd4a35 | 717 | * Similar to remap_pfn_range() (see mm/memory.c) |
83342314 NP |
718 | */ |
719 | int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, | |
720 | unsigned long pgoff) | |
721 | { | |
722 | struct vm_struct *area; | |
723 | unsigned long uaddr = vma->vm_start; | |
724 | unsigned long usize = vma->vm_end - vma->vm_start; | |
725 | int ret; | |
726 | ||
727 | if ((PAGE_SIZE-1) & (unsigned long)addr) | |
728 | return -EINVAL; | |
729 | ||
730 | read_lock(&vmlist_lock); | |
731 | area = __find_vm_area(addr); | |
732 | if (!area) | |
733 | goto out_einval_locked; | |
734 | ||
735 | if (!(area->flags & VM_USERMAP)) | |
736 | goto out_einval_locked; | |
737 | ||
738 | if (usize + (pgoff << PAGE_SHIFT) > area->size - PAGE_SIZE) | |
739 | goto out_einval_locked; | |
740 | read_unlock(&vmlist_lock); | |
741 | ||
742 | addr += pgoff << PAGE_SHIFT; | |
743 | do { | |
744 | struct page *page = vmalloc_to_page(addr); | |
745 | ret = vm_insert_page(vma, uaddr, page); | |
746 | if (ret) | |
747 | return ret; | |
748 | ||
749 | uaddr += PAGE_SIZE; | |
750 | addr += PAGE_SIZE; | |
751 | usize -= PAGE_SIZE; | |
752 | } while (usize > 0); | |
753 | ||
754 | /* Prevent "things" like memory migration? VM_flags need a cleanup... */ | |
755 | vma->vm_flags |= VM_RESERVED; | |
756 | ||
757 | return ret; | |
758 | ||
759 | out_einval_locked: | |
760 | read_unlock(&vmlist_lock); | |
761 | return -EINVAL; | |
762 | } | |
763 | EXPORT_SYMBOL(remap_vmalloc_range); | |
764 | ||
1eeb66a1 CH |
765 | /* |
766 | * Implement a stub for vmalloc_sync_all() if the architecture chose not to | |
767 | * have one. | |
768 | */ | |
769 | void __attribute__((weak)) vmalloc_sync_all(void) | |
770 | { | |
771 | } | |
5f4352fb JF |
772 | |
773 | ||
774 | static int f(pte_t *pte, struct page *pmd_page, unsigned long addr, void *data) | |
775 | { | |
776 | /* apply_to_page_range() does all the hard work. */ | |
777 | return 0; | |
778 | } | |
779 | ||
780 | /** | |
781 | * alloc_vm_area - allocate a range of kernel address space | |
782 | * @size: size of the area | |
783 | * @returns: NULL on failure, vm_struct on success | |
784 | * | |
785 | * This function reserves a range of kernel address space, and | |
786 | * allocates pagetables to map that range. No actual mappings | |
787 | * are created. If the kernel address space is not shared | |
788 | * between processes, it syncs the pagetable across all | |
789 | * processes. | |
790 | */ | |
791 | struct vm_struct *alloc_vm_area(size_t size) | |
792 | { | |
793 | struct vm_struct *area; | |
794 | ||
795 | area = get_vm_area(size, VM_IOREMAP); | |
796 | if (area == NULL) | |
797 | return NULL; | |
798 | ||
799 | /* | |
800 | * This ensures that page tables are constructed for this region | |
801 | * of kernel virtual address space and mapped into init_mm. | |
802 | */ | |
803 | if (apply_to_page_range(&init_mm, (unsigned long)area->addr, | |
804 | area->size, f, NULL)) { | |
805 | free_vm_area(area); | |
806 | return NULL; | |
807 | } | |
808 | ||
809 | /* Make sure the pagetables are constructed in process kernel | |
810 | mappings */ | |
811 | vmalloc_sync_all(); | |
812 | ||
813 | return area; | |
814 | } | |
815 | EXPORT_SYMBOL_GPL(alloc_vm_area); | |
816 | ||
817 | void free_vm_area(struct vm_struct *area) | |
818 | { | |
819 | struct vm_struct *ret; | |
820 | ret = remove_vm_area(area->addr); | |
821 | BUG_ON(ret != area); | |
822 | kfree(area); | |
823 | } | |
824 | EXPORT_SYMBOL_GPL(free_vm_area); |