Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/mm/vmalloc.c | |
4 | * | |
5 | * Copyright (C) 1993 Linus Torvalds | |
6 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
7 | * SMP-safe vmalloc/vfree/ioremap, Tigran Aivazian <tigran@veritas.com>, May 2000 | |
8 | * Major rework to support vmap/vunmap, Christoph Hellwig, SGI, August 2002 | |
930fc45a | 9 | * Numa awareness, Christoph Lameter, SGI, June 2005 |
1da177e4 LT |
10 | */ |
11 | ||
db64fe02 | 12 | #include <linux/vmalloc.h> |
1da177e4 LT |
13 | #include <linux/mm.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/highmem.h> | |
c3edc401 | 16 | #include <linux/sched/signal.h> |
1da177e4 LT |
17 | #include <linux/slab.h> |
18 | #include <linux/spinlock.h> | |
19 | #include <linux/interrupt.h> | |
5f6a6a9c | 20 | #include <linux/proc_fs.h> |
a10aa579 | 21 | #include <linux/seq_file.h> |
868b104d | 22 | #include <linux/set_memory.h> |
3ac7fe5a | 23 | #include <linux/debugobjects.h> |
23016969 | 24 | #include <linux/kallsyms.h> |
db64fe02 | 25 | #include <linux/list.h> |
4da56b99 | 26 | #include <linux/notifier.h> |
db64fe02 NP |
27 | #include <linux/rbtree.h> |
28 | #include <linux/radix-tree.h> | |
29 | #include <linux/rcupdate.h> | |
f0aa6617 | 30 | #include <linux/pfn.h> |
89219d37 | 31 | #include <linux/kmemleak.h> |
60063497 | 32 | #include <linux/atomic.h> |
3b32123d | 33 | #include <linux/compiler.h> |
32fcfd40 | 34 | #include <linux/llist.h> |
0f616be1 | 35 | #include <linux/bitops.h> |
68ad4a33 | 36 | #include <linux/rbtree_augmented.h> |
3b32123d | 37 | |
7c0f6ba6 | 38 | #include <linux/uaccess.h> |
1da177e4 | 39 | #include <asm/tlbflush.h> |
2dca6999 | 40 | #include <asm/shmparam.h> |
1da177e4 | 41 | |
dd56b046 MG |
42 | #include "internal.h" |
43 | ||
186525bd IM |
44 | bool is_vmalloc_addr(const void *x) |
45 | { | |
46 | unsigned long addr = (unsigned long)x; | |
47 | ||
48 | return addr >= VMALLOC_START && addr < VMALLOC_END; | |
49 | } | |
50 | EXPORT_SYMBOL(is_vmalloc_addr); | |
51 | ||
32fcfd40 AV |
52 | struct vfree_deferred { |
53 | struct llist_head list; | |
54 | struct work_struct wq; | |
55 | }; | |
56 | static DEFINE_PER_CPU(struct vfree_deferred, vfree_deferred); | |
57 | ||
58 | static void __vunmap(const void *, int); | |
59 | ||
60 | static void free_work(struct work_struct *w) | |
61 | { | |
62 | struct vfree_deferred *p = container_of(w, struct vfree_deferred, wq); | |
894e58c1 BP |
63 | struct llist_node *t, *llnode; |
64 | ||
65 | llist_for_each_safe(llnode, t, llist_del_all(&p->list)) | |
66 | __vunmap((void *)llnode, 1); | |
32fcfd40 AV |
67 | } |
68 | ||
db64fe02 | 69 | /*** Page table manipulation functions ***/ |
b221385b | 70 | |
1da177e4 LT |
71 | static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end) |
72 | { | |
73 | pte_t *pte; | |
74 | ||
75 | pte = pte_offset_kernel(pmd, addr); | |
76 | do { | |
77 | pte_t ptent = ptep_get_and_clear(&init_mm, addr, pte); | |
78 | WARN_ON(!pte_none(ptent) && !pte_present(ptent)); | |
79 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
80 | } | |
81 | ||
db64fe02 | 82 | static void vunmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end) |
1da177e4 LT |
83 | { |
84 | pmd_t *pmd; | |
85 | unsigned long next; | |
86 | ||
87 | pmd = pmd_offset(pud, addr); | |
88 | do { | |
89 | next = pmd_addr_end(addr, end); | |
b9820d8f TK |
90 | if (pmd_clear_huge(pmd)) |
91 | continue; | |
1da177e4 LT |
92 | if (pmd_none_or_clear_bad(pmd)) |
93 | continue; | |
94 | vunmap_pte_range(pmd, addr, next); | |
95 | } while (pmd++, addr = next, addr != end); | |
96 | } | |
97 | ||
c2febafc | 98 | static void vunmap_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end) |
1da177e4 LT |
99 | { |
100 | pud_t *pud; | |
101 | unsigned long next; | |
102 | ||
c2febafc | 103 | pud = pud_offset(p4d, addr); |
1da177e4 LT |
104 | do { |
105 | next = pud_addr_end(addr, end); | |
b9820d8f TK |
106 | if (pud_clear_huge(pud)) |
107 | continue; | |
1da177e4 LT |
108 | if (pud_none_or_clear_bad(pud)) |
109 | continue; | |
110 | vunmap_pmd_range(pud, addr, next); | |
111 | } while (pud++, addr = next, addr != end); | |
112 | } | |
113 | ||
c2febafc KS |
114 | static void vunmap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end) |
115 | { | |
116 | p4d_t *p4d; | |
117 | unsigned long next; | |
118 | ||
119 | p4d = p4d_offset(pgd, addr); | |
120 | do { | |
121 | next = p4d_addr_end(addr, end); | |
122 | if (p4d_clear_huge(p4d)) | |
123 | continue; | |
124 | if (p4d_none_or_clear_bad(p4d)) | |
125 | continue; | |
126 | vunmap_pud_range(p4d, addr, next); | |
127 | } while (p4d++, addr = next, addr != end); | |
128 | } | |
129 | ||
db64fe02 | 130 | static void vunmap_page_range(unsigned long addr, unsigned long end) |
1da177e4 LT |
131 | { |
132 | pgd_t *pgd; | |
133 | unsigned long next; | |
1da177e4 LT |
134 | |
135 | BUG_ON(addr >= end); | |
136 | pgd = pgd_offset_k(addr); | |
1da177e4 LT |
137 | do { |
138 | next = pgd_addr_end(addr, end); | |
139 | if (pgd_none_or_clear_bad(pgd)) | |
140 | continue; | |
c2febafc | 141 | vunmap_p4d_range(pgd, addr, next); |
1da177e4 | 142 | } while (pgd++, addr = next, addr != end); |
1da177e4 LT |
143 | } |
144 | ||
145 | static int vmap_pte_range(pmd_t *pmd, unsigned long addr, | |
db64fe02 | 146 | unsigned long end, pgprot_t prot, struct page **pages, int *nr) |
1da177e4 LT |
147 | { |
148 | pte_t *pte; | |
149 | ||
db64fe02 NP |
150 | /* |
151 | * nr is a running index into the array which helps higher level | |
152 | * callers keep track of where we're up to. | |
153 | */ | |
154 | ||
872fec16 | 155 | pte = pte_alloc_kernel(pmd, addr); |
1da177e4 LT |
156 | if (!pte) |
157 | return -ENOMEM; | |
158 | do { | |
db64fe02 NP |
159 | struct page *page = pages[*nr]; |
160 | ||
161 | if (WARN_ON(!pte_none(*pte))) | |
162 | return -EBUSY; | |
163 | if (WARN_ON(!page)) | |
1da177e4 LT |
164 | return -ENOMEM; |
165 | set_pte_at(&init_mm, addr, pte, mk_pte(page, prot)); | |
db64fe02 | 166 | (*nr)++; |
1da177e4 LT |
167 | } while (pte++, addr += PAGE_SIZE, addr != end); |
168 | return 0; | |
169 | } | |
170 | ||
db64fe02 NP |
171 | static int vmap_pmd_range(pud_t *pud, unsigned long addr, |
172 | unsigned long end, pgprot_t prot, struct page **pages, int *nr) | |
1da177e4 LT |
173 | { |
174 | pmd_t *pmd; | |
175 | unsigned long next; | |
176 | ||
177 | pmd = pmd_alloc(&init_mm, pud, addr); | |
178 | if (!pmd) | |
179 | return -ENOMEM; | |
180 | do { | |
181 | next = pmd_addr_end(addr, end); | |
db64fe02 | 182 | if (vmap_pte_range(pmd, addr, next, prot, pages, nr)) |
1da177e4 LT |
183 | return -ENOMEM; |
184 | } while (pmd++, addr = next, addr != end); | |
185 | return 0; | |
186 | } | |
187 | ||
c2febafc | 188 | static int vmap_pud_range(p4d_t *p4d, unsigned long addr, |
db64fe02 | 189 | unsigned long end, pgprot_t prot, struct page **pages, int *nr) |
1da177e4 LT |
190 | { |
191 | pud_t *pud; | |
192 | unsigned long next; | |
193 | ||
c2febafc | 194 | pud = pud_alloc(&init_mm, p4d, addr); |
1da177e4 LT |
195 | if (!pud) |
196 | return -ENOMEM; | |
197 | do { | |
198 | next = pud_addr_end(addr, end); | |
db64fe02 | 199 | if (vmap_pmd_range(pud, addr, next, prot, pages, nr)) |
1da177e4 LT |
200 | return -ENOMEM; |
201 | } while (pud++, addr = next, addr != end); | |
202 | return 0; | |
203 | } | |
204 | ||
c2febafc KS |
205 | static int vmap_p4d_range(pgd_t *pgd, unsigned long addr, |
206 | unsigned long end, pgprot_t prot, struct page **pages, int *nr) | |
207 | { | |
208 | p4d_t *p4d; | |
209 | unsigned long next; | |
210 | ||
211 | p4d = p4d_alloc(&init_mm, pgd, addr); | |
212 | if (!p4d) | |
213 | return -ENOMEM; | |
214 | do { | |
215 | next = p4d_addr_end(addr, end); | |
216 | if (vmap_pud_range(p4d, addr, next, prot, pages, nr)) | |
217 | return -ENOMEM; | |
218 | } while (p4d++, addr = next, addr != end); | |
219 | return 0; | |
220 | } | |
221 | ||
db64fe02 NP |
222 | /* |
223 | * Set up page tables in kva (addr, end). The ptes shall have prot "prot", and | |
224 | * will have pfns corresponding to the "pages" array. | |
225 | * | |
226 | * Ie. pte at addr+N*PAGE_SIZE shall point to pfn corresponding to pages[N] | |
227 | */ | |
8fc48985 TH |
228 | static int vmap_page_range_noflush(unsigned long start, unsigned long end, |
229 | pgprot_t prot, struct page **pages) | |
1da177e4 LT |
230 | { |
231 | pgd_t *pgd; | |
232 | unsigned long next; | |
2e4e27c7 | 233 | unsigned long addr = start; |
db64fe02 NP |
234 | int err = 0; |
235 | int nr = 0; | |
1da177e4 LT |
236 | |
237 | BUG_ON(addr >= end); | |
238 | pgd = pgd_offset_k(addr); | |
1da177e4 LT |
239 | do { |
240 | next = pgd_addr_end(addr, end); | |
c2febafc | 241 | err = vmap_p4d_range(pgd, addr, next, prot, pages, &nr); |
1da177e4 | 242 | if (err) |
bf88c8c8 | 243 | return err; |
1da177e4 | 244 | } while (pgd++, addr = next, addr != end); |
db64fe02 | 245 | |
db64fe02 | 246 | return nr; |
1da177e4 LT |
247 | } |
248 | ||
8fc48985 TH |
249 | static int vmap_page_range(unsigned long start, unsigned long end, |
250 | pgprot_t prot, struct page **pages) | |
251 | { | |
252 | int ret; | |
253 | ||
254 | ret = vmap_page_range_noflush(start, end, prot, pages); | |
255 | flush_cache_vmap(start, end); | |
256 | return ret; | |
257 | } | |
258 | ||
81ac3ad9 | 259 | int is_vmalloc_or_module_addr(const void *x) |
73bdf0a6 LT |
260 | { |
261 | /* | |
ab4f2ee1 | 262 | * ARM, x86-64 and sparc64 put modules in a special place, |
73bdf0a6 LT |
263 | * and fall back on vmalloc() if that fails. Others |
264 | * just put it in the vmalloc space. | |
265 | */ | |
266 | #if defined(CONFIG_MODULES) && defined(MODULES_VADDR) | |
267 | unsigned long addr = (unsigned long)x; | |
268 | if (addr >= MODULES_VADDR && addr < MODULES_END) | |
269 | return 1; | |
270 | #endif | |
271 | return is_vmalloc_addr(x); | |
272 | } | |
273 | ||
48667e7a | 274 | /* |
add688fb | 275 | * Walk a vmap address to the struct page it maps. |
48667e7a | 276 | */ |
add688fb | 277 | struct page *vmalloc_to_page(const void *vmalloc_addr) |
48667e7a CL |
278 | { |
279 | unsigned long addr = (unsigned long) vmalloc_addr; | |
add688fb | 280 | struct page *page = NULL; |
48667e7a | 281 | pgd_t *pgd = pgd_offset_k(addr); |
c2febafc KS |
282 | p4d_t *p4d; |
283 | pud_t *pud; | |
284 | pmd_t *pmd; | |
285 | pte_t *ptep, pte; | |
48667e7a | 286 | |
7aa413de IM |
287 | /* |
288 | * XXX we might need to change this if we add VIRTUAL_BUG_ON for | |
289 | * architectures that do not vmalloc module space | |
290 | */ | |
73bdf0a6 | 291 | VIRTUAL_BUG_ON(!is_vmalloc_or_module_addr(vmalloc_addr)); |
59ea7463 | 292 | |
c2febafc KS |
293 | if (pgd_none(*pgd)) |
294 | return NULL; | |
295 | p4d = p4d_offset(pgd, addr); | |
296 | if (p4d_none(*p4d)) | |
297 | return NULL; | |
298 | pud = pud_offset(p4d, addr); | |
029c54b0 AB |
299 | |
300 | /* | |
301 | * Don't dereference bad PUD or PMD (below) entries. This will also | |
302 | * identify huge mappings, which we may encounter on architectures | |
303 | * that define CONFIG_HAVE_ARCH_HUGE_VMAP=y. Such regions will be | |
304 | * identified as vmalloc addresses by is_vmalloc_addr(), but are | |
305 | * not [unambiguously] associated with a struct page, so there is | |
306 | * no correct value to return for them. | |
307 | */ | |
308 | WARN_ON_ONCE(pud_bad(*pud)); | |
309 | if (pud_none(*pud) || pud_bad(*pud)) | |
c2febafc KS |
310 | return NULL; |
311 | pmd = pmd_offset(pud, addr); | |
029c54b0 AB |
312 | WARN_ON_ONCE(pmd_bad(*pmd)); |
313 | if (pmd_none(*pmd) || pmd_bad(*pmd)) | |
c2febafc KS |
314 | return NULL; |
315 | ||
316 | ptep = pte_offset_map(pmd, addr); | |
317 | pte = *ptep; | |
318 | if (pte_present(pte)) | |
319 | page = pte_page(pte); | |
320 | pte_unmap(ptep); | |
add688fb | 321 | return page; |
48667e7a | 322 | } |
add688fb | 323 | EXPORT_SYMBOL(vmalloc_to_page); |
48667e7a CL |
324 | |
325 | /* | |
add688fb | 326 | * Map a vmalloc()-space virtual address to the physical page frame number. |
48667e7a | 327 | */ |
add688fb | 328 | unsigned long vmalloc_to_pfn(const void *vmalloc_addr) |
48667e7a | 329 | { |
add688fb | 330 | return page_to_pfn(vmalloc_to_page(vmalloc_addr)); |
48667e7a | 331 | } |
add688fb | 332 | EXPORT_SYMBOL(vmalloc_to_pfn); |
48667e7a | 333 | |
db64fe02 NP |
334 | |
335 | /*** Global kva allocator ***/ | |
336 | ||
bb850f4d | 337 | #define DEBUG_AUGMENT_PROPAGATE_CHECK 0 |
a6cf4e0f | 338 | #define DEBUG_AUGMENT_LOWEST_MATCH_CHECK 0 |
bb850f4d | 339 | |
db64fe02 | 340 | |
db64fe02 | 341 | static DEFINE_SPINLOCK(vmap_area_lock); |
e36176be | 342 | static DEFINE_SPINLOCK(free_vmap_area_lock); |
f1c4069e JK |
343 | /* Export for kexec only */ |
344 | LIST_HEAD(vmap_area_list); | |
80c4bd7a | 345 | static LLIST_HEAD(vmap_purge_list); |
89699605 | 346 | static struct rb_root vmap_area_root = RB_ROOT; |
68ad4a33 | 347 | static bool vmap_initialized __read_mostly; |
89699605 | 348 | |
68ad4a33 URS |
349 | /* |
350 | * This kmem_cache is used for vmap_area objects. Instead of | |
351 | * allocating from slab we reuse an object from this cache to | |
352 | * make things faster. Especially in "no edge" splitting of | |
353 | * free block. | |
354 | */ | |
355 | static struct kmem_cache *vmap_area_cachep; | |
356 | ||
357 | /* | |
358 | * This linked list is used in pair with free_vmap_area_root. | |
359 | * It gives O(1) access to prev/next to perform fast coalescing. | |
360 | */ | |
361 | static LIST_HEAD(free_vmap_area_list); | |
362 | ||
363 | /* | |
364 | * This augment red-black tree represents the free vmap space. | |
365 | * All vmap_area objects in this tree are sorted by va->va_start | |
366 | * address. It is used for allocation and merging when a vmap | |
367 | * object is released. | |
368 | * | |
369 | * Each vmap_area node contains a maximum available free block | |
370 | * of its sub-tree, right or left. Therefore it is possible to | |
371 | * find a lowest match of free area. | |
372 | */ | |
373 | static struct rb_root free_vmap_area_root = RB_ROOT; | |
374 | ||
82dd23e8 URS |
375 | /* |
376 | * Preload a CPU with one object for "no edge" split case. The | |
377 | * aim is to get rid of allocations from the atomic context, thus | |
378 | * to use more permissive allocation masks. | |
379 | */ | |
380 | static DEFINE_PER_CPU(struct vmap_area *, ne_fit_preload_node); | |
381 | ||
68ad4a33 URS |
382 | static __always_inline unsigned long |
383 | va_size(struct vmap_area *va) | |
384 | { | |
385 | return (va->va_end - va->va_start); | |
386 | } | |
387 | ||
388 | static __always_inline unsigned long | |
389 | get_subtree_max_size(struct rb_node *node) | |
390 | { | |
391 | struct vmap_area *va; | |
392 | ||
393 | va = rb_entry_safe(node, struct vmap_area, rb_node); | |
394 | return va ? va->subtree_max_size : 0; | |
395 | } | |
89699605 | 396 | |
68ad4a33 URS |
397 | /* |
398 | * Gets called when remove the node and rotate. | |
399 | */ | |
400 | static __always_inline unsigned long | |
401 | compute_subtree_max_size(struct vmap_area *va) | |
402 | { | |
403 | return max3(va_size(va), | |
404 | get_subtree_max_size(va->rb_node.rb_left), | |
405 | get_subtree_max_size(va->rb_node.rb_right)); | |
406 | } | |
407 | ||
315cc066 ML |
408 | RB_DECLARE_CALLBACKS_MAX(static, free_vmap_area_rb_augment_cb, |
409 | struct vmap_area, rb_node, unsigned long, subtree_max_size, va_size) | |
68ad4a33 URS |
410 | |
411 | static void purge_vmap_area_lazy(void); | |
412 | static BLOCKING_NOTIFIER_HEAD(vmap_notify_list); | |
413 | static unsigned long lazy_max_pages(void); | |
db64fe02 | 414 | |
97105f0a RG |
415 | static atomic_long_t nr_vmalloc_pages; |
416 | ||
417 | unsigned long vmalloc_nr_pages(void) | |
418 | { | |
419 | return atomic_long_read(&nr_vmalloc_pages); | |
420 | } | |
421 | ||
db64fe02 | 422 | static struct vmap_area *__find_vmap_area(unsigned long addr) |
1da177e4 | 423 | { |
db64fe02 NP |
424 | struct rb_node *n = vmap_area_root.rb_node; |
425 | ||
426 | while (n) { | |
427 | struct vmap_area *va; | |
428 | ||
429 | va = rb_entry(n, struct vmap_area, rb_node); | |
430 | if (addr < va->va_start) | |
431 | n = n->rb_left; | |
cef2ac3f | 432 | else if (addr >= va->va_end) |
db64fe02 NP |
433 | n = n->rb_right; |
434 | else | |
435 | return va; | |
436 | } | |
437 | ||
438 | return NULL; | |
439 | } | |
440 | ||
68ad4a33 URS |
441 | /* |
442 | * This function returns back addresses of parent node | |
443 | * and its left or right link for further processing. | |
444 | */ | |
445 | static __always_inline struct rb_node ** | |
446 | find_va_links(struct vmap_area *va, | |
447 | struct rb_root *root, struct rb_node *from, | |
448 | struct rb_node **parent) | |
449 | { | |
450 | struct vmap_area *tmp_va; | |
451 | struct rb_node **link; | |
452 | ||
453 | if (root) { | |
454 | link = &root->rb_node; | |
455 | if (unlikely(!*link)) { | |
456 | *parent = NULL; | |
457 | return link; | |
458 | } | |
459 | } else { | |
460 | link = &from; | |
461 | } | |
db64fe02 | 462 | |
68ad4a33 URS |
463 | /* |
464 | * Go to the bottom of the tree. When we hit the last point | |
465 | * we end up with parent rb_node and correct direction, i name | |
466 | * it link, where the new va->rb_node will be attached to. | |
467 | */ | |
468 | do { | |
469 | tmp_va = rb_entry(*link, struct vmap_area, rb_node); | |
db64fe02 | 470 | |
68ad4a33 URS |
471 | /* |
472 | * During the traversal we also do some sanity check. | |
473 | * Trigger the BUG() if there are sides(left/right) | |
474 | * or full overlaps. | |
475 | */ | |
476 | if (va->va_start < tmp_va->va_end && | |
477 | va->va_end <= tmp_va->va_start) | |
478 | link = &(*link)->rb_left; | |
479 | else if (va->va_end > tmp_va->va_start && | |
480 | va->va_start >= tmp_va->va_end) | |
481 | link = &(*link)->rb_right; | |
db64fe02 NP |
482 | else |
483 | BUG(); | |
68ad4a33 URS |
484 | } while (*link); |
485 | ||
486 | *parent = &tmp_va->rb_node; | |
487 | return link; | |
488 | } | |
489 | ||
490 | static __always_inline struct list_head * | |
491 | get_va_next_sibling(struct rb_node *parent, struct rb_node **link) | |
492 | { | |
493 | struct list_head *list; | |
494 | ||
495 | if (unlikely(!parent)) | |
496 | /* | |
497 | * The red-black tree where we try to find VA neighbors | |
498 | * before merging or inserting is empty, i.e. it means | |
499 | * there is no free vmap space. Normally it does not | |
500 | * happen but we handle this case anyway. | |
501 | */ | |
502 | return NULL; | |
503 | ||
504 | list = &rb_entry(parent, struct vmap_area, rb_node)->list; | |
505 | return (&parent->rb_right == link ? list->next : list); | |
506 | } | |
507 | ||
508 | static __always_inline void | |
509 | link_va(struct vmap_area *va, struct rb_root *root, | |
510 | struct rb_node *parent, struct rb_node **link, struct list_head *head) | |
511 | { | |
512 | /* | |
513 | * VA is still not in the list, but we can | |
514 | * identify its future previous list_head node. | |
515 | */ | |
516 | if (likely(parent)) { | |
517 | head = &rb_entry(parent, struct vmap_area, rb_node)->list; | |
518 | if (&parent->rb_right != link) | |
519 | head = head->prev; | |
db64fe02 NP |
520 | } |
521 | ||
68ad4a33 URS |
522 | /* Insert to the rb-tree */ |
523 | rb_link_node(&va->rb_node, parent, link); | |
524 | if (root == &free_vmap_area_root) { | |
525 | /* | |
526 | * Some explanation here. Just perform simple insertion | |
527 | * to the tree. We do not set va->subtree_max_size to | |
528 | * its current size before calling rb_insert_augmented(). | |
529 | * It is because of we populate the tree from the bottom | |
530 | * to parent levels when the node _is_ in the tree. | |
531 | * | |
532 | * Therefore we set subtree_max_size to zero after insertion, | |
533 | * to let __augment_tree_propagate_from() puts everything to | |
534 | * the correct order later on. | |
535 | */ | |
536 | rb_insert_augmented(&va->rb_node, | |
537 | root, &free_vmap_area_rb_augment_cb); | |
538 | va->subtree_max_size = 0; | |
539 | } else { | |
540 | rb_insert_color(&va->rb_node, root); | |
541 | } | |
db64fe02 | 542 | |
68ad4a33 URS |
543 | /* Address-sort this list */ |
544 | list_add(&va->list, head); | |
db64fe02 NP |
545 | } |
546 | ||
68ad4a33 URS |
547 | static __always_inline void |
548 | unlink_va(struct vmap_area *va, struct rb_root *root) | |
549 | { | |
460e42d1 URS |
550 | if (WARN_ON(RB_EMPTY_NODE(&va->rb_node))) |
551 | return; | |
db64fe02 | 552 | |
460e42d1 URS |
553 | if (root == &free_vmap_area_root) |
554 | rb_erase_augmented(&va->rb_node, | |
555 | root, &free_vmap_area_rb_augment_cb); | |
556 | else | |
557 | rb_erase(&va->rb_node, root); | |
558 | ||
559 | list_del(&va->list); | |
560 | RB_CLEAR_NODE(&va->rb_node); | |
68ad4a33 URS |
561 | } |
562 | ||
bb850f4d URS |
563 | #if DEBUG_AUGMENT_PROPAGATE_CHECK |
564 | static void | |
565 | augment_tree_propagate_check(struct rb_node *n) | |
566 | { | |
567 | struct vmap_area *va; | |
568 | struct rb_node *node; | |
569 | unsigned long size; | |
570 | bool found = false; | |
571 | ||
572 | if (n == NULL) | |
573 | return; | |
574 | ||
575 | va = rb_entry(n, struct vmap_area, rb_node); | |
576 | size = va->subtree_max_size; | |
577 | node = n; | |
578 | ||
579 | while (node) { | |
580 | va = rb_entry(node, struct vmap_area, rb_node); | |
581 | ||
582 | if (get_subtree_max_size(node->rb_left) == size) { | |
583 | node = node->rb_left; | |
584 | } else { | |
585 | if (va_size(va) == size) { | |
586 | found = true; | |
587 | break; | |
588 | } | |
589 | ||
590 | node = node->rb_right; | |
591 | } | |
592 | } | |
593 | ||
594 | if (!found) { | |
595 | va = rb_entry(n, struct vmap_area, rb_node); | |
596 | pr_emerg("tree is corrupted: %lu, %lu\n", | |
597 | va_size(va), va->subtree_max_size); | |
598 | } | |
599 | ||
600 | augment_tree_propagate_check(n->rb_left); | |
601 | augment_tree_propagate_check(n->rb_right); | |
602 | } | |
603 | #endif | |
604 | ||
68ad4a33 URS |
605 | /* |
606 | * This function populates subtree_max_size from bottom to upper | |
607 | * levels starting from VA point. The propagation must be done | |
608 | * when VA size is modified by changing its va_start/va_end. Or | |
609 | * in case of newly inserting of VA to the tree. | |
610 | * | |
611 | * It means that __augment_tree_propagate_from() must be called: | |
612 | * - After VA has been inserted to the tree(free path); | |
613 | * - After VA has been shrunk(allocation path); | |
614 | * - After VA has been increased(merging path). | |
615 | * | |
616 | * Please note that, it does not mean that upper parent nodes | |
617 | * and their subtree_max_size are recalculated all the time up | |
618 | * to the root node. | |
619 | * | |
620 | * 4--8 | |
621 | * /\ | |
622 | * / \ | |
623 | * / \ | |
624 | * 2--2 8--8 | |
625 | * | |
626 | * For example if we modify the node 4, shrinking it to 2, then | |
627 | * no any modification is required. If we shrink the node 2 to 1 | |
628 | * its subtree_max_size is updated only, and set to 1. If we shrink | |
629 | * the node 8 to 6, then its subtree_max_size is set to 6 and parent | |
630 | * node becomes 4--6. | |
631 | */ | |
632 | static __always_inline void | |
633 | augment_tree_propagate_from(struct vmap_area *va) | |
634 | { | |
635 | struct rb_node *node = &va->rb_node; | |
636 | unsigned long new_va_sub_max_size; | |
637 | ||
638 | while (node) { | |
639 | va = rb_entry(node, struct vmap_area, rb_node); | |
640 | new_va_sub_max_size = compute_subtree_max_size(va); | |
641 | ||
642 | /* | |
643 | * If the newly calculated maximum available size of the | |
644 | * subtree is equal to the current one, then it means that | |
645 | * the tree is propagated correctly. So we have to stop at | |
646 | * this point to save cycles. | |
647 | */ | |
648 | if (va->subtree_max_size == new_va_sub_max_size) | |
649 | break; | |
650 | ||
651 | va->subtree_max_size = new_va_sub_max_size; | |
652 | node = rb_parent(&va->rb_node); | |
653 | } | |
bb850f4d URS |
654 | |
655 | #if DEBUG_AUGMENT_PROPAGATE_CHECK | |
656 | augment_tree_propagate_check(free_vmap_area_root.rb_node); | |
657 | #endif | |
68ad4a33 URS |
658 | } |
659 | ||
660 | static void | |
661 | insert_vmap_area(struct vmap_area *va, | |
662 | struct rb_root *root, struct list_head *head) | |
663 | { | |
664 | struct rb_node **link; | |
665 | struct rb_node *parent; | |
666 | ||
667 | link = find_va_links(va, root, NULL, &parent); | |
668 | link_va(va, root, parent, link, head); | |
669 | } | |
670 | ||
671 | static void | |
672 | insert_vmap_area_augment(struct vmap_area *va, | |
673 | struct rb_node *from, struct rb_root *root, | |
674 | struct list_head *head) | |
675 | { | |
676 | struct rb_node **link; | |
677 | struct rb_node *parent; | |
678 | ||
679 | if (from) | |
680 | link = find_va_links(va, NULL, from, &parent); | |
681 | else | |
682 | link = find_va_links(va, root, NULL, &parent); | |
683 | ||
684 | link_va(va, root, parent, link, head); | |
685 | augment_tree_propagate_from(va); | |
686 | } | |
687 | ||
688 | /* | |
689 | * Merge de-allocated chunk of VA memory with previous | |
690 | * and next free blocks. If coalesce is not done a new | |
691 | * free area is inserted. If VA has been merged, it is | |
692 | * freed. | |
693 | */ | |
3c5c3cfb | 694 | static __always_inline struct vmap_area * |
68ad4a33 URS |
695 | merge_or_add_vmap_area(struct vmap_area *va, |
696 | struct rb_root *root, struct list_head *head) | |
697 | { | |
698 | struct vmap_area *sibling; | |
699 | struct list_head *next; | |
700 | struct rb_node **link; | |
701 | struct rb_node *parent; | |
702 | bool merged = false; | |
703 | ||
704 | /* | |
705 | * Find a place in the tree where VA potentially will be | |
706 | * inserted, unless it is merged with its sibling/siblings. | |
707 | */ | |
708 | link = find_va_links(va, root, NULL, &parent); | |
709 | ||
710 | /* | |
711 | * Get next node of VA to check if merging can be done. | |
712 | */ | |
713 | next = get_va_next_sibling(parent, link); | |
714 | if (unlikely(next == NULL)) | |
715 | goto insert; | |
716 | ||
717 | /* | |
718 | * start end | |
719 | * | | | |
720 | * |<------VA------>|<-----Next----->| | |
721 | * | | | |
722 | * start end | |
723 | */ | |
724 | if (next != head) { | |
725 | sibling = list_entry(next, struct vmap_area, list); | |
726 | if (sibling->va_start == va->va_end) { | |
727 | sibling->va_start = va->va_start; | |
728 | ||
729 | /* Check and update the tree if needed. */ | |
730 | augment_tree_propagate_from(sibling); | |
731 | ||
68ad4a33 URS |
732 | /* Free vmap_area object. */ |
733 | kmem_cache_free(vmap_area_cachep, va); | |
734 | ||
735 | /* Point to the new merged area. */ | |
736 | va = sibling; | |
737 | merged = true; | |
738 | } | |
739 | } | |
740 | ||
741 | /* | |
742 | * start end | |
743 | * | | | |
744 | * |<-----Prev----->|<------VA------>| | |
745 | * | | | |
746 | * start end | |
747 | */ | |
748 | if (next->prev != head) { | |
749 | sibling = list_entry(next->prev, struct vmap_area, list); | |
750 | if (sibling->va_end == va->va_start) { | |
751 | sibling->va_end = va->va_end; | |
752 | ||
753 | /* Check and update the tree if needed. */ | |
754 | augment_tree_propagate_from(sibling); | |
755 | ||
54f63d9d URS |
756 | if (merged) |
757 | unlink_va(va, root); | |
68ad4a33 URS |
758 | |
759 | /* Free vmap_area object. */ | |
760 | kmem_cache_free(vmap_area_cachep, va); | |
3c5c3cfb DA |
761 | |
762 | /* Point to the new merged area. */ | |
763 | va = sibling; | |
764 | merged = true; | |
68ad4a33 URS |
765 | } |
766 | } | |
767 | ||
768 | insert: | |
769 | if (!merged) { | |
770 | link_va(va, root, parent, link, head); | |
771 | augment_tree_propagate_from(va); | |
772 | } | |
3c5c3cfb DA |
773 | |
774 | return va; | |
68ad4a33 URS |
775 | } |
776 | ||
777 | static __always_inline bool | |
778 | is_within_this_va(struct vmap_area *va, unsigned long size, | |
779 | unsigned long align, unsigned long vstart) | |
780 | { | |
781 | unsigned long nva_start_addr; | |
782 | ||
783 | if (va->va_start > vstart) | |
784 | nva_start_addr = ALIGN(va->va_start, align); | |
785 | else | |
786 | nva_start_addr = ALIGN(vstart, align); | |
787 | ||
788 | /* Can be overflowed due to big size or alignment. */ | |
789 | if (nva_start_addr + size < nva_start_addr || | |
790 | nva_start_addr < vstart) | |
791 | return false; | |
792 | ||
793 | return (nva_start_addr + size <= va->va_end); | |
794 | } | |
795 | ||
796 | /* | |
797 | * Find the first free block(lowest start address) in the tree, | |
798 | * that will accomplish the request corresponding to passing | |
799 | * parameters. | |
800 | */ | |
801 | static __always_inline struct vmap_area * | |
802 | find_vmap_lowest_match(unsigned long size, | |
803 | unsigned long align, unsigned long vstart) | |
804 | { | |
805 | struct vmap_area *va; | |
806 | struct rb_node *node; | |
807 | unsigned long length; | |
808 | ||
809 | /* Start from the root. */ | |
810 | node = free_vmap_area_root.rb_node; | |
811 | ||
812 | /* Adjust the search size for alignment overhead. */ | |
813 | length = size + align - 1; | |
814 | ||
815 | while (node) { | |
816 | va = rb_entry(node, struct vmap_area, rb_node); | |
817 | ||
818 | if (get_subtree_max_size(node->rb_left) >= length && | |
819 | vstart < va->va_start) { | |
820 | node = node->rb_left; | |
821 | } else { | |
822 | if (is_within_this_va(va, size, align, vstart)) | |
823 | return va; | |
824 | ||
825 | /* | |
826 | * Does not make sense to go deeper towards the right | |
827 | * sub-tree if it does not have a free block that is | |
828 | * equal or bigger to the requested search length. | |
829 | */ | |
830 | if (get_subtree_max_size(node->rb_right) >= length) { | |
831 | node = node->rb_right; | |
832 | continue; | |
833 | } | |
834 | ||
835 | /* | |
3806b041 | 836 | * OK. We roll back and find the first right sub-tree, |
68ad4a33 URS |
837 | * that will satisfy the search criteria. It can happen |
838 | * only once due to "vstart" restriction. | |
839 | */ | |
840 | while ((node = rb_parent(node))) { | |
841 | va = rb_entry(node, struct vmap_area, rb_node); | |
842 | if (is_within_this_va(va, size, align, vstart)) | |
843 | return va; | |
844 | ||
845 | if (get_subtree_max_size(node->rb_right) >= length && | |
846 | vstart <= va->va_start) { | |
847 | node = node->rb_right; | |
848 | break; | |
849 | } | |
850 | } | |
851 | } | |
852 | } | |
853 | ||
854 | return NULL; | |
855 | } | |
856 | ||
a6cf4e0f URS |
857 | #if DEBUG_AUGMENT_LOWEST_MATCH_CHECK |
858 | #include <linux/random.h> | |
859 | ||
860 | static struct vmap_area * | |
861 | find_vmap_lowest_linear_match(unsigned long size, | |
862 | unsigned long align, unsigned long vstart) | |
863 | { | |
864 | struct vmap_area *va; | |
865 | ||
866 | list_for_each_entry(va, &free_vmap_area_list, list) { | |
867 | if (!is_within_this_va(va, size, align, vstart)) | |
868 | continue; | |
869 | ||
870 | return va; | |
871 | } | |
872 | ||
873 | return NULL; | |
874 | } | |
875 | ||
876 | static void | |
877 | find_vmap_lowest_match_check(unsigned long size) | |
878 | { | |
879 | struct vmap_area *va_1, *va_2; | |
880 | unsigned long vstart; | |
881 | unsigned int rnd; | |
882 | ||
883 | get_random_bytes(&rnd, sizeof(rnd)); | |
884 | vstart = VMALLOC_START + rnd; | |
885 | ||
886 | va_1 = find_vmap_lowest_match(size, 1, vstart); | |
887 | va_2 = find_vmap_lowest_linear_match(size, 1, vstart); | |
888 | ||
889 | if (va_1 != va_2) | |
890 | pr_emerg("not lowest: t: 0x%p, l: 0x%p, v: 0x%lx\n", | |
891 | va_1, va_2, vstart); | |
892 | } | |
893 | #endif | |
894 | ||
68ad4a33 URS |
895 | enum fit_type { |
896 | NOTHING_FIT = 0, | |
897 | FL_FIT_TYPE = 1, /* full fit */ | |
898 | LE_FIT_TYPE = 2, /* left edge fit */ | |
899 | RE_FIT_TYPE = 3, /* right edge fit */ | |
900 | NE_FIT_TYPE = 4 /* no edge fit */ | |
901 | }; | |
902 | ||
903 | static __always_inline enum fit_type | |
904 | classify_va_fit_type(struct vmap_area *va, | |
905 | unsigned long nva_start_addr, unsigned long size) | |
906 | { | |
907 | enum fit_type type; | |
908 | ||
909 | /* Check if it is within VA. */ | |
910 | if (nva_start_addr < va->va_start || | |
911 | nva_start_addr + size > va->va_end) | |
912 | return NOTHING_FIT; | |
913 | ||
914 | /* Now classify. */ | |
915 | if (va->va_start == nva_start_addr) { | |
916 | if (va->va_end == nva_start_addr + size) | |
917 | type = FL_FIT_TYPE; | |
918 | else | |
919 | type = LE_FIT_TYPE; | |
920 | } else if (va->va_end == nva_start_addr + size) { | |
921 | type = RE_FIT_TYPE; | |
922 | } else { | |
923 | type = NE_FIT_TYPE; | |
924 | } | |
925 | ||
926 | return type; | |
927 | } | |
928 | ||
929 | static __always_inline int | |
930 | adjust_va_to_fit_type(struct vmap_area *va, | |
931 | unsigned long nva_start_addr, unsigned long size, | |
932 | enum fit_type type) | |
933 | { | |
2c929233 | 934 | struct vmap_area *lva = NULL; |
68ad4a33 URS |
935 | |
936 | if (type == FL_FIT_TYPE) { | |
937 | /* | |
938 | * No need to split VA, it fully fits. | |
939 | * | |
940 | * | | | |
941 | * V NVA V | |
942 | * |---------------| | |
943 | */ | |
944 | unlink_va(va, &free_vmap_area_root); | |
945 | kmem_cache_free(vmap_area_cachep, va); | |
946 | } else if (type == LE_FIT_TYPE) { | |
947 | /* | |
948 | * Split left edge of fit VA. | |
949 | * | |
950 | * | | | |
951 | * V NVA V R | |
952 | * |-------|-------| | |
953 | */ | |
954 | va->va_start += size; | |
955 | } else if (type == RE_FIT_TYPE) { | |
956 | /* | |
957 | * Split right edge of fit VA. | |
958 | * | |
959 | * | | | |
960 | * L V NVA V | |
961 | * |-------|-------| | |
962 | */ | |
963 | va->va_end = nva_start_addr; | |
964 | } else if (type == NE_FIT_TYPE) { | |
965 | /* | |
966 | * Split no edge of fit VA. | |
967 | * | |
968 | * | | | |
969 | * L V NVA V R | |
970 | * |---|-------|---| | |
971 | */ | |
82dd23e8 URS |
972 | lva = __this_cpu_xchg(ne_fit_preload_node, NULL); |
973 | if (unlikely(!lva)) { | |
974 | /* | |
975 | * For percpu allocator we do not do any pre-allocation | |
976 | * and leave it as it is. The reason is it most likely | |
977 | * never ends up with NE_FIT_TYPE splitting. In case of | |
978 | * percpu allocations offsets and sizes are aligned to | |
979 | * fixed align request, i.e. RE_FIT_TYPE and FL_FIT_TYPE | |
980 | * are its main fitting cases. | |
981 | * | |
982 | * There are a few exceptions though, as an example it is | |
983 | * a first allocation (early boot up) when we have "one" | |
984 | * big free space that has to be split. | |
060650a2 URS |
985 | * |
986 | * Also we can hit this path in case of regular "vmap" | |
987 | * allocations, if "this" current CPU was not preloaded. | |
988 | * See the comment in alloc_vmap_area() why. If so, then | |
989 | * GFP_NOWAIT is used instead to get an extra object for | |
990 | * split purpose. That is rare and most time does not | |
991 | * occur. | |
992 | * | |
993 | * What happens if an allocation gets failed. Basically, | |
994 | * an "overflow" path is triggered to purge lazily freed | |
995 | * areas to free some memory, then, the "retry" path is | |
996 | * triggered to repeat one more time. See more details | |
997 | * in alloc_vmap_area() function. | |
82dd23e8 URS |
998 | */ |
999 | lva = kmem_cache_alloc(vmap_area_cachep, GFP_NOWAIT); | |
1000 | if (!lva) | |
1001 | return -1; | |
1002 | } | |
68ad4a33 URS |
1003 | |
1004 | /* | |
1005 | * Build the remainder. | |
1006 | */ | |
1007 | lva->va_start = va->va_start; | |
1008 | lva->va_end = nva_start_addr; | |
1009 | ||
1010 | /* | |
1011 | * Shrink this VA to remaining size. | |
1012 | */ | |
1013 | va->va_start = nva_start_addr + size; | |
1014 | } else { | |
1015 | return -1; | |
1016 | } | |
1017 | ||
1018 | if (type != FL_FIT_TYPE) { | |
1019 | augment_tree_propagate_from(va); | |
1020 | ||
2c929233 | 1021 | if (lva) /* type == NE_FIT_TYPE */ |
68ad4a33 URS |
1022 | insert_vmap_area_augment(lva, &va->rb_node, |
1023 | &free_vmap_area_root, &free_vmap_area_list); | |
1024 | } | |
1025 | ||
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Returns a start address of the newly allocated area, if success. | |
1031 | * Otherwise a vend is returned that indicates failure. | |
1032 | */ | |
1033 | static __always_inline unsigned long | |
1034 | __alloc_vmap_area(unsigned long size, unsigned long align, | |
cacca6ba | 1035 | unsigned long vstart, unsigned long vend) |
68ad4a33 URS |
1036 | { |
1037 | unsigned long nva_start_addr; | |
1038 | struct vmap_area *va; | |
1039 | enum fit_type type; | |
1040 | int ret; | |
1041 | ||
1042 | va = find_vmap_lowest_match(size, align, vstart); | |
1043 | if (unlikely(!va)) | |
1044 | return vend; | |
1045 | ||
1046 | if (va->va_start > vstart) | |
1047 | nva_start_addr = ALIGN(va->va_start, align); | |
1048 | else | |
1049 | nva_start_addr = ALIGN(vstart, align); | |
1050 | ||
1051 | /* Check the "vend" restriction. */ | |
1052 | if (nva_start_addr + size > vend) | |
1053 | return vend; | |
1054 | ||
1055 | /* Classify what we have found. */ | |
1056 | type = classify_va_fit_type(va, nva_start_addr, size); | |
1057 | if (WARN_ON_ONCE(type == NOTHING_FIT)) | |
1058 | return vend; | |
1059 | ||
1060 | /* Update the free vmap_area. */ | |
1061 | ret = adjust_va_to_fit_type(va, nva_start_addr, size, type); | |
1062 | if (ret) | |
1063 | return vend; | |
1064 | ||
a6cf4e0f URS |
1065 | #if DEBUG_AUGMENT_LOWEST_MATCH_CHECK |
1066 | find_vmap_lowest_match_check(size); | |
1067 | #endif | |
1068 | ||
68ad4a33 URS |
1069 | return nva_start_addr; |
1070 | } | |
4da56b99 | 1071 | |
d98c9e83 AR |
1072 | /* |
1073 | * Free a region of KVA allocated by alloc_vmap_area | |
1074 | */ | |
1075 | static void free_vmap_area(struct vmap_area *va) | |
1076 | { | |
1077 | /* | |
1078 | * Remove from the busy tree/list. | |
1079 | */ | |
1080 | spin_lock(&vmap_area_lock); | |
1081 | unlink_va(va, &vmap_area_root); | |
1082 | spin_unlock(&vmap_area_lock); | |
1083 | ||
1084 | /* | |
1085 | * Insert/Merge it back to the free tree/list. | |
1086 | */ | |
1087 | spin_lock(&free_vmap_area_lock); | |
1088 | merge_or_add_vmap_area(va, &free_vmap_area_root, &free_vmap_area_list); | |
1089 | spin_unlock(&free_vmap_area_lock); | |
1090 | } | |
1091 | ||
db64fe02 NP |
1092 | /* |
1093 | * Allocate a region of KVA of the specified size and alignment, within the | |
1094 | * vstart and vend. | |
1095 | */ | |
1096 | static struct vmap_area *alloc_vmap_area(unsigned long size, | |
1097 | unsigned long align, | |
1098 | unsigned long vstart, unsigned long vend, | |
1099 | int node, gfp_t gfp_mask) | |
1100 | { | |
82dd23e8 | 1101 | struct vmap_area *va, *pva; |
1da177e4 | 1102 | unsigned long addr; |
db64fe02 | 1103 | int purged = 0; |
d98c9e83 | 1104 | int ret; |
db64fe02 | 1105 | |
7766970c | 1106 | BUG_ON(!size); |
891c49ab | 1107 | BUG_ON(offset_in_page(size)); |
89699605 | 1108 | BUG_ON(!is_power_of_2(align)); |
db64fe02 | 1109 | |
68ad4a33 URS |
1110 | if (unlikely(!vmap_initialized)) |
1111 | return ERR_PTR(-EBUSY); | |
1112 | ||
5803ed29 | 1113 | might_sleep(); |
f07116d7 | 1114 | gfp_mask = gfp_mask & GFP_RECLAIM_MASK; |
4da56b99 | 1115 | |
f07116d7 | 1116 | va = kmem_cache_alloc_node(vmap_area_cachep, gfp_mask, node); |
db64fe02 NP |
1117 | if (unlikely(!va)) |
1118 | return ERR_PTR(-ENOMEM); | |
1119 | ||
7f88f88f CM |
1120 | /* |
1121 | * Only scan the relevant parts containing pointers to other objects | |
1122 | * to avoid false negatives. | |
1123 | */ | |
f07116d7 | 1124 | kmemleak_scan_area(&va->rb_node, SIZE_MAX, gfp_mask); |
7f88f88f | 1125 | |
db64fe02 | 1126 | retry: |
82dd23e8 | 1127 | /* |
81f1ba58 URS |
1128 | * Preload this CPU with one extra vmap_area object. It is used |
1129 | * when fit type of free area is NE_FIT_TYPE. Please note, it | |
1130 | * does not guarantee that an allocation occurs on a CPU that | |
1131 | * is preloaded, instead we minimize the case when it is not. | |
1132 | * It can happen because of cpu migration, because there is a | |
1133 | * race until the below spinlock is taken. | |
82dd23e8 URS |
1134 | * |
1135 | * The preload is done in non-atomic context, thus it allows us | |
1136 | * to use more permissive allocation masks to be more stable under | |
81f1ba58 URS |
1137 | * low memory condition and high memory pressure. In rare case, |
1138 | * if not preloaded, GFP_NOWAIT is used. | |
82dd23e8 | 1139 | * |
81f1ba58 | 1140 | * Set "pva" to NULL here, because of "retry" path. |
82dd23e8 | 1141 | */ |
81f1ba58 | 1142 | pva = NULL; |
82dd23e8 | 1143 | |
81f1ba58 URS |
1144 | if (!this_cpu_read(ne_fit_preload_node)) |
1145 | /* | |
1146 | * Even if it fails we do not really care about that. | |
1147 | * Just proceed as it is. If needed "overflow" path | |
1148 | * will refill the cache we allocate from. | |
1149 | */ | |
f07116d7 | 1150 | pva = kmem_cache_alloc_node(vmap_area_cachep, gfp_mask, node); |
82dd23e8 | 1151 | |
e36176be | 1152 | spin_lock(&free_vmap_area_lock); |
81f1ba58 URS |
1153 | |
1154 | if (pva && __this_cpu_cmpxchg(ne_fit_preload_node, NULL, pva)) | |
1155 | kmem_cache_free(vmap_area_cachep, pva); | |
89699605 | 1156 | |
afd07389 | 1157 | /* |
68ad4a33 URS |
1158 | * If an allocation fails, the "vend" address is |
1159 | * returned. Therefore trigger the overflow path. | |
afd07389 | 1160 | */ |
cacca6ba | 1161 | addr = __alloc_vmap_area(size, align, vstart, vend); |
e36176be URS |
1162 | spin_unlock(&free_vmap_area_lock); |
1163 | ||
68ad4a33 | 1164 | if (unlikely(addr == vend)) |
89699605 | 1165 | goto overflow; |
db64fe02 NP |
1166 | |
1167 | va->va_start = addr; | |
1168 | va->va_end = addr + size; | |
688fcbfc | 1169 | va->vm = NULL; |
68ad4a33 | 1170 | |
d98c9e83 | 1171 | |
e36176be URS |
1172 | spin_lock(&vmap_area_lock); |
1173 | insert_vmap_area(va, &vmap_area_root, &vmap_area_list); | |
db64fe02 NP |
1174 | spin_unlock(&vmap_area_lock); |
1175 | ||
61e16557 | 1176 | BUG_ON(!IS_ALIGNED(va->va_start, align)); |
89699605 NP |
1177 | BUG_ON(va->va_start < vstart); |
1178 | BUG_ON(va->va_end > vend); | |
1179 | ||
d98c9e83 AR |
1180 | ret = kasan_populate_vmalloc(addr, size); |
1181 | if (ret) { | |
1182 | free_vmap_area(va); | |
1183 | return ERR_PTR(ret); | |
1184 | } | |
1185 | ||
db64fe02 | 1186 | return va; |
89699605 NP |
1187 | |
1188 | overflow: | |
89699605 NP |
1189 | if (!purged) { |
1190 | purge_vmap_area_lazy(); | |
1191 | purged = 1; | |
1192 | goto retry; | |
1193 | } | |
4da56b99 CW |
1194 | |
1195 | if (gfpflags_allow_blocking(gfp_mask)) { | |
1196 | unsigned long freed = 0; | |
1197 | blocking_notifier_call_chain(&vmap_notify_list, 0, &freed); | |
1198 | if (freed > 0) { | |
1199 | purged = 0; | |
1200 | goto retry; | |
1201 | } | |
1202 | } | |
1203 | ||
03497d76 | 1204 | if (!(gfp_mask & __GFP_NOWARN) && printk_ratelimit()) |
756a025f JP |
1205 | pr_warn("vmap allocation for size %lu failed: use vmalloc=<size> to increase size\n", |
1206 | size); | |
68ad4a33 URS |
1207 | |
1208 | kmem_cache_free(vmap_area_cachep, va); | |
89699605 | 1209 | return ERR_PTR(-EBUSY); |
db64fe02 NP |
1210 | } |
1211 | ||
4da56b99 CW |
1212 | int register_vmap_purge_notifier(struct notifier_block *nb) |
1213 | { | |
1214 | return blocking_notifier_chain_register(&vmap_notify_list, nb); | |
1215 | } | |
1216 | EXPORT_SYMBOL_GPL(register_vmap_purge_notifier); | |
1217 | ||
1218 | int unregister_vmap_purge_notifier(struct notifier_block *nb) | |
1219 | { | |
1220 | return blocking_notifier_chain_unregister(&vmap_notify_list, nb); | |
1221 | } | |
1222 | EXPORT_SYMBOL_GPL(unregister_vmap_purge_notifier); | |
1223 | ||
db64fe02 NP |
1224 | /* |
1225 | * Clear the pagetable entries of a given vmap_area | |
1226 | */ | |
1227 | static void unmap_vmap_area(struct vmap_area *va) | |
1228 | { | |
1229 | vunmap_page_range(va->va_start, va->va_end); | |
1230 | } | |
1231 | ||
1232 | /* | |
1233 | * lazy_max_pages is the maximum amount of virtual address space we gather up | |
1234 | * before attempting to purge with a TLB flush. | |
1235 | * | |
1236 | * There is a tradeoff here: a larger number will cover more kernel page tables | |
1237 | * and take slightly longer to purge, but it will linearly reduce the number of | |
1238 | * global TLB flushes that must be performed. It would seem natural to scale | |
1239 | * this number up linearly with the number of CPUs (because vmapping activity | |
1240 | * could also scale linearly with the number of CPUs), however it is likely | |
1241 | * that in practice, workloads might be constrained in other ways that mean | |
1242 | * vmap activity will not scale linearly with CPUs. Also, I want to be | |
1243 | * conservative and not introduce a big latency on huge systems, so go with | |
1244 | * a less aggressive log scale. It will still be an improvement over the old | |
1245 | * code, and it will be simple to change the scale factor if we find that it | |
1246 | * becomes a problem on bigger systems. | |
1247 | */ | |
1248 | static unsigned long lazy_max_pages(void) | |
1249 | { | |
1250 | unsigned int log; | |
1251 | ||
1252 | log = fls(num_online_cpus()); | |
1253 | ||
1254 | return log * (32UL * 1024 * 1024 / PAGE_SIZE); | |
1255 | } | |
1256 | ||
4d36e6f8 | 1257 | static atomic_long_t vmap_lazy_nr = ATOMIC_LONG_INIT(0); |
db64fe02 | 1258 | |
0574ecd1 CH |
1259 | /* |
1260 | * Serialize vmap purging. There is no actual criticial section protected | |
1261 | * by this look, but we want to avoid concurrent calls for performance | |
1262 | * reasons and to make the pcpu_get_vm_areas more deterministic. | |
1263 | */ | |
f9e09977 | 1264 | static DEFINE_MUTEX(vmap_purge_lock); |
0574ecd1 | 1265 | |
02b709df NP |
1266 | /* for per-CPU blocks */ |
1267 | static void purge_fragmented_blocks_allcpus(void); | |
1268 | ||
3ee48b6a CW |
1269 | /* |
1270 | * called before a call to iounmap() if the caller wants vm_area_struct's | |
1271 | * immediately freed. | |
1272 | */ | |
1273 | void set_iounmap_nonlazy(void) | |
1274 | { | |
4d36e6f8 | 1275 | atomic_long_set(&vmap_lazy_nr, lazy_max_pages()+1); |
3ee48b6a CW |
1276 | } |
1277 | ||
db64fe02 NP |
1278 | /* |
1279 | * Purges all lazily-freed vmap areas. | |
db64fe02 | 1280 | */ |
0574ecd1 | 1281 | static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end) |
db64fe02 | 1282 | { |
4d36e6f8 | 1283 | unsigned long resched_threshold; |
80c4bd7a | 1284 | struct llist_node *valist; |
db64fe02 | 1285 | struct vmap_area *va; |
cbb76676 | 1286 | struct vmap_area *n_va; |
db64fe02 | 1287 | |
0574ecd1 | 1288 | lockdep_assert_held(&vmap_purge_lock); |
02b709df | 1289 | |
80c4bd7a | 1290 | valist = llist_del_all(&vmap_purge_list); |
68571be9 URS |
1291 | if (unlikely(valist == NULL)) |
1292 | return false; | |
1293 | ||
3f8fd02b JR |
1294 | /* |
1295 | * First make sure the mappings are removed from all page-tables | |
1296 | * before they are freed. | |
1297 | */ | |
763802b5 | 1298 | vmalloc_sync_unmappings(); |
3f8fd02b | 1299 | |
68571be9 URS |
1300 | /* |
1301 | * TODO: to calculate a flush range without looping. | |
1302 | * The list can be up to lazy_max_pages() elements. | |
1303 | */ | |
80c4bd7a | 1304 | llist_for_each_entry(va, valist, purge_list) { |
0574ecd1 CH |
1305 | if (va->va_start < start) |
1306 | start = va->va_start; | |
1307 | if (va->va_end > end) | |
1308 | end = va->va_end; | |
db64fe02 | 1309 | } |
db64fe02 | 1310 | |
0574ecd1 | 1311 | flush_tlb_kernel_range(start, end); |
4d36e6f8 | 1312 | resched_threshold = lazy_max_pages() << 1; |
db64fe02 | 1313 | |
e36176be | 1314 | spin_lock(&free_vmap_area_lock); |
763b218d | 1315 | llist_for_each_entry_safe(va, n_va, valist, purge_list) { |
4d36e6f8 | 1316 | unsigned long nr = (va->va_end - va->va_start) >> PAGE_SHIFT; |
3c5c3cfb DA |
1317 | unsigned long orig_start = va->va_start; |
1318 | unsigned long orig_end = va->va_end; | |
763b218d | 1319 | |
dd3b8353 URS |
1320 | /* |
1321 | * Finally insert or merge lazily-freed area. It is | |
1322 | * detached and there is no need to "unlink" it from | |
1323 | * anything. | |
1324 | */ | |
3c5c3cfb DA |
1325 | va = merge_or_add_vmap_area(va, &free_vmap_area_root, |
1326 | &free_vmap_area_list); | |
1327 | ||
1328 | if (is_vmalloc_or_module_addr((void *)orig_start)) | |
1329 | kasan_release_vmalloc(orig_start, orig_end, | |
1330 | va->va_start, va->va_end); | |
dd3b8353 | 1331 | |
4d36e6f8 | 1332 | atomic_long_sub(nr, &vmap_lazy_nr); |
68571be9 | 1333 | |
4d36e6f8 | 1334 | if (atomic_long_read(&vmap_lazy_nr) < resched_threshold) |
e36176be | 1335 | cond_resched_lock(&free_vmap_area_lock); |
763b218d | 1336 | } |
e36176be | 1337 | spin_unlock(&free_vmap_area_lock); |
0574ecd1 | 1338 | return true; |
db64fe02 NP |
1339 | } |
1340 | ||
496850e5 NP |
1341 | /* |
1342 | * Kick off a purge of the outstanding lazy areas. Don't bother if somebody | |
1343 | * is already purging. | |
1344 | */ | |
1345 | static void try_purge_vmap_area_lazy(void) | |
1346 | { | |
f9e09977 | 1347 | if (mutex_trylock(&vmap_purge_lock)) { |
0574ecd1 | 1348 | __purge_vmap_area_lazy(ULONG_MAX, 0); |
f9e09977 | 1349 | mutex_unlock(&vmap_purge_lock); |
0574ecd1 | 1350 | } |
496850e5 NP |
1351 | } |
1352 | ||
db64fe02 NP |
1353 | /* |
1354 | * Kick off a purge of the outstanding lazy areas. | |
1355 | */ | |
1356 | static void purge_vmap_area_lazy(void) | |
1357 | { | |
f9e09977 | 1358 | mutex_lock(&vmap_purge_lock); |
0574ecd1 CH |
1359 | purge_fragmented_blocks_allcpus(); |
1360 | __purge_vmap_area_lazy(ULONG_MAX, 0); | |
f9e09977 | 1361 | mutex_unlock(&vmap_purge_lock); |
db64fe02 NP |
1362 | } |
1363 | ||
1364 | /* | |
64141da5 JF |
1365 | * Free a vmap area, caller ensuring that the area has been unmapped |
1366 | * and flush_cache_vunmap had been called for the correct range | |
1367 | * previously. | |
db64fe02 | 1368 | */ |
64141da5 | 1369 | static void free_vmap_area_noflush(struct vmap_area *va) |
db64fe02 | 1370 | { |
4d36e6f8 | 1371 | unsigned long nr_lazy; |
80c4bd7a | 1372 | |
dd3b8353 URS |
1373 | spin_lock(&vmap_area_lock); |
1374 | unlink_va(va, &vmap_area_root); | |
1375 | spin_unlock(&vmap_area_lock); | |
1376 | ||
4d36e6f8 URS |
1377 | nr_lazy = atomic_long_add_return((va->va_end - va->va_start) >> |
1378 | PAGE_SHIFT, &vmap_lazy_nr); | |
80c4bd7a CW |
1379 | |
1380 | /* After this point, we may free va at any time */ | |
1381 | llist_add(&va->purge_list, &vmap_purge_list); | |
1382 | ||
1383 | if (unlikely(nr_lazy > lazy_max_pages())) | |
496850e5 | 1384 | try_purge_vmap_area_lazy(); |
db64fe02 NP |
1385 | } |
1386 | ||
b29acbdc NP |
1387 | /* |
1388 | * Free and unmap a vmap area | |
1389 | */ | |
1390 | static void free_unmap_vmap_area(struct vmap_area *va) | |
1391 | { | |
1392 | flush_cache_vunmap(va->va_start, va->va_end); | |
c8eef01e | 1393 | unmap_vmap_area(va); |
8e57f8ac | 1394 | if (debug_pagealloc_enabled_static()) |
82a2e924 CP |
1395 | flush_tlb_kernel_range(va->va_start, va->va_end); |
1396 | ||
c8eef01e | 1397 | free_vmap_area_noflush(va); |
b29acbdc NP |
1398 | } |
1399 | ||
db64fe02 NP |
1400 | static struct vmap_area *find_vmap_area(unsigned long addr) |
1401 | { | |
1402 | struct vmap_area *va; | |
1403 | ||
1404 | spin_lock(&vmap_area_lock); | |
1405 | va = __find_vmap_area(addr); | |
1406 | spin_unlock(&vmap_area_lock); | |
1407 | ||
1408 | return va; | |
1409 | } | |
1410 | ||
db64fe02 NP |
1411 | /*** Per cpu kva allocator ***/ |
1412 | ||
1413 | /* | |
1414 | * vmap space is limited especially on 32 bit architectures. Ensure there is | |
1415 | * room for at least 16 percpu vmap blocks per CPU. | |
1416 | */ | |
1417 | /* | |
1418 | * If we had a constant VMALLOC_START and VMALLOC_END, we'd like to be able | |
1419 | * to #define VMALLOC_SPACE (VMALLOC_END-VMALLOC_START). Guess | |
1420 | * instead (we just need a rough idea) | |
1421 | */ | |
1422 | #if BITS_PER_LONG == 32 | |
1423 | #define VMALLOC_SPACE (128UL*1024*1024) | |
1424 | #else | |
1425 | #define VMALLOC_SPACE (128UL*1024*1024*1024) | |
1426 | #endif | |
1427 | ||
1428 | #define VMALLOC_PAGES (VMALLOC_SPACE / PAGE_SIZE) | |
1429 | #define VMAP_MAX_ALLOC BITS_PER_LONG /* 256K with 4K pages */ | |
1430 | #define VMAP_BBMAP_BITS_MAX 1024 /* 4MB with 4K pages */ | |
1431 | #define VMAP_BBMAP_BITS_MIN (VMAP_MAX_ALLOC*2) | |
1432 | #define VMAP_MIN(x, y) ((x) < (y) ? (x) : (y)) /* can't use min() */ | |
1433 | #define VMAP_MAX(x, y) ((x) > (y) ? (x) : (y)) /* can't use max() */ | |
f982f915 CL |
1434 | #define VMAP_BBMAP_BITS \ |
1435 | VMAP_MIN(VMAP_BBMAP_BITS_MAX, \ | |
1436 | VMAP_MAX(VMAP_BBMAP_BITS_MIN, \ | |
1437 | VMALLOC_PAGES / roundup_pow_of_two(NR_CPUS) / 16)) | |
db64fe02 NP |
1438 | |
1439 | #define VMAP_BLOCK_SIZE (VMAP_BBMAP_BITS * PAGE_SIZE) | |
1440 | ||
1441 | struct vmap_block_queue { | |
1442 | spinlock_t lock; | |
1443 | struct list_head free; | |
db64fe02 NP |
1444 | }; |
1445 | ||
1446 | struct vmap_block { | |
1447 | spinlock_t lock; | |
1448 | struct vmap_area *va; | |
db64fe02 | 1449 | unsigned long free, dirty; |
7d61bfe8 | 1450 | unsigned long dirty_min, dirty_max; /*< dirty range */ |
de560423 NP |
1451 | struct list_head free_list; |
1452 | struct rcu_head rcu_head; | |
02b709df | 1453 | struct list_head purge; |
db64fe02 NP |
1454 | }; |
1455 | ||
1456 | /* Queue of free and dirty vmap blocks, for allocation and flushing purposes */ | |
1457 | static DEFINE_PER_CPU(struct vmap_block_queue, vmap_block_queue); | |
1458 | ||
1459 | /* | |
1460 | * Radix tree of vmap blocks, indexed by address, to quickly find a vmap block | |
1461 | * in the free path. Could get rid of this if we change the API to return a | |
1462 | * "cookie" from alloc, to be passed to free. But no big deal yet. | |
1463 | */ | |
1464 | static DEFINE_SPINLOCK(vmap_block_tree_lock); | |
1465 | static RADIX_TREE(vmap_block_tree, GFP_ATOMIC); | |
1466 | ||
1467 | /* | |
1468 | * We should probably have a fallback mechanism to allocate virtual memory | |
1469 | * out of partially filled vmap blocks. However vmap block sizing should be | |
1470 | * fairly reasonable according to the vmalloc size, so it shouldn't be a | |
1471 | * big problem. | |
1472 | */ | |
1473 | ||
1474 | static unsigned long addr_to_vb_idx(unsigned long addr) | |
1475 | { | |
1476 | addr -= VMALLOC_START & ~(VMAP_BLOCK_SIZE-1); | |
1477 | addr /= VMAP_BLOCK_SIZE; | |
1478 | return addr; | |
1479 | } | |
1480 | ||
cf725ce2 RP |
1481 | static void *vmap_block_vaddr(unsigned long va_start, unsigned long pages_off) |
1482 | { | |
1483 | unsigned long addr; | |
1484 | ||
1485 | addr = va_start + (pages_off << PAGE_SHIFT); | |
1486 | BUG_ON(addr_to_vb_idx(addr) != addr_to_vb_idx(va_start)); | |
1487 | return (void *)addr; | |
1488 | } | |
1489 | ||
1490 | /** | |
1491 | * new_vmap_block - allocates new vmap_block and occupies 2^order pages in this | |
1492 | * block. Of course pages number can't exceed VMAP_BBMAP_BITS | |
1493 | * @order: how many 2^order pages should be occupied in newly allocated block | |
1494 | * @gfp_mask: flags for the page level allocator | |
1495 | * | |
a862f68a | 1496 | * Return: virtual address in a newly allocated block or ERR_PTR(-errno) |
cf725ce2 RP |
1497 | */ |
1498 | static void *new_vmap_block(unsigned int order, gfp_t gfp_mask) | |
db64fe02 NP |
1499 | { |
1500 | struct vmap_block_queue *vbq; | |
1501 | struct vmap_block *vb; | |
1502 | struct vmap_area *va; | |
1503 | unsigned long vb_idx; | |
1504 | int node, err; | |
cf725ce2 | 1505 | void *vaddr; |
db64fe02 NP |
1506 | |
1507 | node = numa_node_id(); | |
1508 | ||
1509 | vb = kmalloc_node(sizeof(struct vmap_block), | |
1510 | gfp_mask & GFP_RECLAIM_MASK, node); | |
1511 | if (unlikely(!vb)) | |
1512 | return ERR_PTR(-ENOMEM); | |
1513 | ||
1514 | va = alloc_vmap_area(VMAP_BLOCK_SIZE, VMAP_BLOCK_SIZE, | |
1515 | VMALLOC_START, VMALLOC_END, | |
1516 | node, gfp_mask); | |
ddf9c6d4 | 1517 | if (IS_ERR(va)) { |
db64fe02 | 1518 | kfree(vb); |
e7d86340 | 1519 | return ERR_CAST(va); |
db64fe02 NP |
1520 | } |
1521 | ||
1522 | err = radix_tree_preload(gfp_mask); | |
1523 | if (unlikely(err)) { | |
1524 | kfree(vb); | |
1525 | free_vmap_area(va); | |
1526 | return ERR_PTR(err); | |
1527 | } | |
1528 | ||
cf725ce2 | 1529 | vaddr = vmap_block_vaddr(va->va_start, 0); |
db64fe02 NP |
1530 | spin_lock_init(&vb->lock); |
1531 | vb->va = va; | |
cf725ce2 RP |
1532 | /* At least something should be left free */ |
1533 | BUG_ON(VMAP_BBMAP_BITS <= (1UL << order)); | |
1534 | vb->free = VMAP_BBMAP_BITS - (1UL << order); | |
db64fe02 | 1535 | vb->dirty = 0; |
7d61bfe8 RP |
1536 | vb->dirty_min = VMAP_BBMAP_BITS; |
1537 | vb->dirty_max = 0; | |
db64fe02 | 1538 | INIT_LIST_HEAD(&vb->free_list); |
db64fe02 NP |
1539 | |
1540 | vb_idx = addr_to_vb_idx(va->va_start); | |
1541 | spin_lock(&vmap_block_tree_lock); | |
1542 | err = radix_tree_insert(&vmap_block_tree, vb_idx, vb); | |
1543 | spin_unlock(&vmap_block_tree_lock); | |
1544 | BUG_ON(err); | |
1545 | radix_tree_preload_end(); | |
1546 | ||
1547 | vbq = &get_cpu_var(vmap_block_queue); | |
db64fe02 | 1548 | spin_lock(&vbq->lock); |
68ac546f | 1549 | list_add_tail_rcu(&vb->free_list, &vbq->free); |
db64fe02 | 1550 | spin_unlock(&vbq->lock); |
3f04ba85 | 1551 | put_cpu_var(vmap_block_queue); |
db64fe02 | 1552 | |
cf725ce2 | 1553 | return vaddr; |
db64fe02 NP |
1554 | } |
1555 | ||
db64fe02 NP |
1556 | static void free_vmap_block(struct vmap_block *vb) |
1557 | { | |
1558 | struct vmap_block *tmp; | |
1559 | unsigned long vb_idx; | |
1560 | ||
db64fe02 NP |
1561 | vb_idx = addr_to_vb_idx(vb->va->va_start); |
1562 | spin_lock(&vmap_block_tree_lock); | |
1563 | tmp = radix_tree_delete(&vmap_block_tree, vb_idx); | |
1564 | spin_unlock(&vmap_block_tree_lock); | |
1565 | BUG_ON(tmp != vb); | |
1566 | ||
64141da5 | 1567 | free_vmap_area_noflush(vb->va); |
22a3c7d1 | 1568 | kfree_rcu(vb, rcu_head); |
db64fe02 NP |
1569 | } |
1570 | ||
02b709df NP |
1571 | static void purge_fragmented_blocks(int cpu) |
1572 | { | |
1573 | LIST_HEAD(purge); | |
1574 | struct vmap_block *vb; | |
1575 | struct vmap_block *n_vb; | |
1576 | struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu); | |
1577 | ||
1578 | rcu_read_lock(); | |
1579 | list_for_each_entry_rcu(vb, &vbq->free, free_list) { | |
1580 | ||
1581 | if (!(vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS)) | |
1582 | continue; | |
1583 | ||
1584 | spin_lock(&vb->lock); | |
1585 | if (vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS) { | |
1586 | vb->free = 0; /* prevent further allocs after releasing lock */ | |
1587 | vb->dirty = VMAP_BBMAP_BITS; /* prevent purging it again */ | |
7d61bfe8 RP |
1588 | vb->dirty_min = 0; |
1589 | vb->dirty_max = VMAP_BBMAP_BITS; | |
02b709df NP |
1590 | spin_lock(&vbq->lock); |
1591 | list_del_rcu(&vb->free_list); | |
1592 | spin_unlock(&vbq->lock); | |
1593 | spin_unlock(&vb->lock); | |
1594 | list_add_tail(&vb->purge, &purge); | |
1595 | } else | |
1596 | spin_unlock(&vb->lock); | |
1597 | } | |
1598 | rcu_read_unlock(); | |
1599 | ||
1600 | list_for_each_entry_safe(vb, n_vb, &purge, purge) { | |
1601 | list_del(&vb->purge); | |
1602 | free_vmap_block(vb); | |
1603 | } | |
1604 | } | |
1605 | ||
02b709df NP |
1606 | static void purge_fragmented_blocks_allcpus(void) |
1607 | { | |
1608 | int cpu; | |
1609 | ||
1610 | for_each_possible_cpu(cpu) | |
1611 | purge_fragmented_blocks(cpu); | |
1612 | } | |
1613 | ||
db64fe02 NP |
1614 | static void *vb_alloc(unsigned long size, gfp_t gfp_mask) |
1615 | { | |
1616 | struct vmap_block_queue *vbq; | |
1617 | struct vmap_block *vb; | |
cf725ce2 | 1618 | void *vaddr = NULL; |
db64fe02 NP |
1619 | unsigned int order; |
1620 | ||
891c49ab | 1621 | BUG_ON(offset_in_page(size)); |
db64fe02 | 1622 | BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC); |
aa91c4d8 JK |
1623 | if (WARN_ON(size == 0)) { |
1624 | /* | |
1625 | * Allocating 0 bytes isn't what caller wants since | |
1626 | * get_order(0) returns funny result. Just warn and terminate | |
1627 | * early. | |
1628 | */ | |
1629 | return NULL; | |
1630 | } | |
db64fe02 NP |
1631 | order = get_order(size); |
1632 | ||
db64fe02 NP |
1633 | rcu_read_lock(); |
1634 | vbq = &get_cpu_var(vmap_block_queue); | |
1635 | list_for_each_entry_rcu(vb, &vbq->free, free_list) { | |
cf725ce2 | 1636 | unsigned long pages_off; |
db64fe02 NP |
1637 | |
1638 | spin_lock(&vb->lock); | |
cf725ce2 RP |
1639 | if (vb->free < (1UL << order)) { |
1640 | spin_unlock(&vb->lock); | |
1641 | continue; | |
1642 | } | |
02b709df | 1643 | |
cf725ce2 RP |
1644 | pages_off = VMAP_BBMAP_BITS - vb->free; |
1645 | vaddr = vmap_block_vaddr(vb->va->va_start, pages_off); | |
02b709df NP |
1646 | vb->free -= 1UL << order; |
1647 | if (vb->free == 0) { | |
1648 | spin_lock(&vbq->lock); | |
1649 | list_del_rcu(&vb->free_list); | |
1650 | spin_unlock(&vbq->lock); | |
1651 | } | |
cf725ce2 | 1652 | |
02b709df NP |
1653 | spin_unlock(&vb->lock); |
1654 | break; | |
db64fe02 | 1655 | } |
02b709df | 1656 | |
3f04ba85 | 1657 | put_cpu_var(vmap_block_queue); |
db64fe02 NP |
1658 | rcu_read_unlock(); |
1659 | ||
cf725ce2 RP |
1660 | /* Allocate new block if nothing was found */ |
1661 | if (!vaddr) | |
1662 | vaddr = new_vmap_block(order, gfp_mask); | |
db64fe02 | 1663 | |
cf725ce2 | 1664 | return vaddr; |
db64fe02 NP |
1665 | } |
1666 | ||
1667 | static void vb_free(const void *addr, unsigned long size) | |
1668 | { | |
1669 | unsigned long offset; | |
1670 | unsigned long vb_idx; | |
1671 | unsigned int order; | |
1672 | struct vmap_block *vb; | |
1673 | ||
891c49ab | 1674 | BUG_ON(offset_in_page(size)); |
db64fe02 | 1675 | BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC); |
b29acbdc NP |
1676 | |
1677 | flush_cache_vunmap((unsigned long)addr, (unsigned long)addr + size); | |
1678 | ||
db64fe02 NP |
1679 | order = get_order(size); |
1680 | ||
1681 | offset = (unsigned long)addr & (VMAP_BLOCK_SIZE - 1); | |
7d61bfe8 | 1682 | offset >>= PAGE_SHIFT; |
db64fe02 NP |
1683 | |
1684 | vb_idx = addr_to_vb_idx((unsigned long)addr); | |
1685 | rcu_read_lock(); | |
1686 | vb = radix_tree_lookup(&vmap_block_tree, vb_idx); | |
1687 | rcu_read_unlock(); | |
1688 | BUG_ON(!vb); | |
1689 | ||
64141da5 JF |
1690 | vunmap_page_range((unsigned long)addr, (unsigned long)addr + size); |
1691 | ||
8e57f8ac | 1692 | if (debug_pagealloc_enabled_static()) |
82a2e924 CP |
1693 | flush_tlb_kernel_range((unsigned long)addr, |
1694 | (unsigned long)addr + size); | |
1695 | ||
db64fe02 | 1696 | spin_lock(&vb->lock); |
7d61bfe8 RP |
1697 | |
1698 | /* Expand dirty range */ | |
1699 | vb->dirty_min = min(vb->dirty_min, offset); | |
1700 | vb->dirty_max = max(vb->dirty_max, offset + (1UL << order)); | |
d086817d | 1701 | |
db64fe02 NP |
1702 | vb->dirty += 1UL << order; |
1703 | if (vb->dirty == VMAP_BBMAP_BITS) { | |
de560423 | 1704 | BUG_ON(vb->free); |
db64fe02 NP |
1705 | spin_unlock(&vb->lock); |
1706 | free_vmap_block(vb); | |
1707 | } else | |
1708 | spin_unlock(&vb->lock); | |
1709 | } | |
1710 | ||
868b104d | 1711 | static void _vm_unmap_aliases(unsigned long start, unsigned long end, int flush) |
db64fe02 | 1712 | { |
db64fe02 | 1713 | int cpu; |
db64fe02 | 1714 | |
9b463334 JF |
1715 | if (unlikely(!vmap_initialized)) |
1716 | return; | |
1717 | ||
5803ed29 CH |
1718 | might_sleep(); |
1719 | ||
db64fe02 NP |
1720 | for_each_possible_cpu(cpu) { |
1721 | struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu); | |
1722 | struct vmap_block *vb; | |
1723 | ||
1724 | rcu_read_lock(); | |
1725 | list_for_each_entry_rcu(vb, &vbq->free, free_list) { | |
db64fe02 | 1726 | spin_lock(&vb->lock); |
7d61bfe8 RP |
1727 | if (vb->dirty) { |
1728 | unsigned long va_start = vb->va->va_start; | |
db64fe02 | 1729 | unsigned long s, e; |
b136be5e | 1730 | |
7d61bfe8 RP |
1731 | s = va_start + (vb->dirty_min << PAGE_SHIFT); |
1732 | e = va_start + (vb->dirty_max << PAGE_SHIFT); | |
db64fe02 | 1733 | |
7d61bfe8 RP |
1734 | start = min(s, start); |
1735 | end = max(e, end); | |
db64fe02 | 1736 | |
7d61bfe8 | 1737 | flush = 1; |
db64fe02 NP |
1738 | } |
1739 | spin_unlock(&vb->lock); | |
1740 | } | |
1741 | rcu_read_unlock(); | |
1742 | } | |
1743 | ||
f9e09977 | 1744 | mutex_lock(&vmap_purge_lock); |
0574ecd1 CH |
1745 | purge_fragmented_blocks_allcpus(); |
1746 | if (!__purge_vmap_area_lazy(start, end) && flush) | |
1747 | flush_tlb_kernel_range(start, end); | |
f9e09977 | 1748 | mutex_unlock(&vmap_purge_lock); |
db64fe02 | 1749 | } |
868b104d RE |
1750 | |
1751 | /** | |
1752 | * vm_unmap_aliases - unmap outstanding lazy aliases in the vmap layer | |
1753 | * | |
1754 | * The vmap/vmalloc layer lazily flushes kernel virtual mappings primarily | |
1755 | * to amortize TLB flushing overheads. What this means is that any page you | |
1756 | * have now, may, in a former life, have been mapped into kernel virtual | |
1757 | * address by the vmap layer and so there might be some CPUs with TLB entries | |
1758 | * still referencing that page (additional to the regular 1:1 kernel mapping). | |
1759 | * | |
1760 | * vm_unmap_aliases flushes all such lazy mappings. After it returns, we can | |
1761 | * be sure that none of the pages we have control over will have any aliases | |
1762 | * from the vmap layer. | |
1763 | */ | |
1764 | void vm_unmap_aliases(void) | |
1765 | { | |
1766 | unsigned long start = ULONG_MAX, end = 0; | |
1767 | int flush = 0; | |
1768 | ||
1769 | _vm_unmap_aliases(start, end, flush); | |
1770 | } | |
db64fe02 NP |
1771 | EXPORT_SYMBOL_GPL(vm_unmap_aliases); |
1772 | ||
1773 | /** | |
1774 | * vm_unmap_ram - unmap linear kernel address space set up by vm_map_ram | |
1775 | * @mem: the pointer returned by vm_map_ram | |
1776 | * @count: the count passed to that vm_map_ram call (cannot unmap partial) | |
1777 | */ | |
1778 | void vm_unmap_ram(const void *mem, unsigned int count) | |
1779 | { | |
65ee03c4 | 1780 | unsigned long size = (unsigned long)count << PAGE_SHIFT; |
db64fe02 | 1781 | unsigned long addr = (unsigned long)mem; |
9c3acf60 | 1782 | struct vmap_area *va; |
db64fe02 | 1783 | |
5803ed29 | 1784 | might_sleep(); |
db64fe02 NP |
1785 | BUG_ON(!addr); |
1786 | BUG_ON(addr < VMALLOC_START); | |
1787 | BUG_ON(addr > VMALLOC_END); | |
a1c0b1a0 | 1788 | BUG_ON(!PAGE_ALIGNED(addr)); |
db64fe02 | 1789 | |
d98c9e83 AR |
1790 | kasan_poison_vmalloc(mem, size); |
1791 | ||
9c3acf60 | 1792 | if (likely(count <= VMAP_MAX_ALLOC)) { |
05e3ff95 | 1793 | debug_check_no_locks_freed(mem, size); |
db64fe02 | 1794 | vb_free(mem, size); |
9c3acf60 CH |
1795 | return; |
1796 | } | |
1797 | ||
1798 | va = find_vmap_area(addr); | |
1799 | BUG_ON(!va); | |
05e3ff95 CP |
1800 | debug_check_no_locks_freed((void *)va->va_start, |
1801 | (va->va_end - va->va_start)); | |
9c3acf60 | 1802 | free_unmap_vmap_area(va); |
db64fe02 NP |
1803 | } |
1804 | EXPORT_SYMBOL(vm_unmap_ram); | |
1805 | ||
1806 | /** | |
1807 | * vm_map_ram - map pages linearly into kernel virtual address (vmalloc space) | |
1808 | * @pages: an array of pointers to the pages to be mapped | |
1809 | * @count: number of pages | |
1810 | * @node: prefer to allocate data structures on this node | |
1811 | * @prot: memory protection to use. PAGE_KERNEL for regular RAM | |
e99c97ad | 1812 | * |
36437638 GK |
1813 | * If you use this function for less than VMAP_MAX_ALLOC pages, it could be |
1814 | * faster than vmap so it's good. But if you mix long-life and short-life | |
1815 | * objects with vm_map_ram(), it could consume lots of address space through | |
1816 | * fragmentation (especially on a 32bit machine). You could see failures in | |
1817 | * the end. Please use this function for short-lived objects. | |
1818 | * | |
e99c97ad | 1819 | * Returns: a pointer to the address that has been mapped, or %NULL on failure |
db64fe02 NP |
1820 | */ |
1821 | void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot) | |
1822 | { | |
65ee03c4 | 1823 | unsigned long size = (unsigned long)count << PAGE_SHIFT; |
db64fe02 NP |
1824 | unsigned long addr; |
1825 | void *mem; | |
1826 | ||
1827 | if (likely(count <= VMAP_MAX_ALLOC)) { | |
1828 | mem = vb_alloc(size, GFP_KERNEL); | |
1829 | if (IS_ERR(mem)) | |
1830 | return NULL; | |
1831 | addr = (unsigned long)mem; | |
1832 | } else { | |
1833 | struct vmap_area *va; | |
1834 | va = alloc_vmap_area(size, PAGE_SIZE, | |
1835 | VMALLOC_START, VMALLOC_END, node, GFP_KERNEL); | |
1836 | if (IS_ERR(va)) | |
1837 | return NULL; | |
1838 | ||
1839 | addr = va->va_start; | |
1840 | mem = (void *)addr; | |
1841 | } | |
d98c9e83 AR |
1842 | |
1843 | kasan_unpoison_vmalloc(mem, size); | |
1844 | ||
db64fe02 NP |
1845 | if (vmap_page_range(addr, addr + size, prot, pages) < 0) { |
1846 | vm_unmap_ram(mem, count); | |
1847 | return NULL; | |
1848 | } | |
1849 | return mem; | |
1850 | } | |
1851 | EXPORT_SYMBOL(vm_map_ram); | |
1852 | ||
4341fa45 | 1853 | static struct vm_struct *vmlist __initdata; |
92eac168 | 1854 | |
be9b7335 NP |
1855 | /** |
1856 | * vm_area_add_early - add vmap area early during boot | |
1857 | * @vm: vm_struct to add | |
1858 | * | |
1859 | * This function is used to add fixed kernel vm area to vmlist before | |
1860 | * vmalloc_init() is called. @vm->addr, @vm->size, and @vm->flags | |
1861 | * should contain proper values and the other fields should be zero. | |
1862 | * | |
1863 | * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING. | |
1864 | */ | |
1865 | void __init vm_area_add_early(struct vm_struct *vm) | |
1866 | { | |
1867 | struct vm_struct *tmp, **p; | |
1868 | ||
1869 | BUG_ON(vmap_initialized); | |
1870 | for (p = &vmlist; (tmp = *p) != NULL; p = &tmp->next) { | |
1871 | if (tmp->addr >= vm->addr) { | |
1872 | BUG_ON(tmp->addr < vm->addr + vm->size); | |
1873 | break; | |
1874 | } else | |
1875 | BUG_ON(tmp->addr + tmp->size > vm->addr); | |
1876 | } | |
1877 | vm->next = *p; | |
1878 | *p = vm; | |
1879 | } | |
1880 | ||
f0aa6617 TH |
1881 | /** |
1882 | * vm_area_register_early - register vmap area early during boot | |
1883 | * @vm: vm_struct to register | |
c0c0a293 | 1884 | * @align: requested alignment |
f0aa6617 TH |
1885 | * |
1886 | * This function is used to register kernel vm area before | |
1887 | * vmalloc_init() is called. @vm->size and @vm->flags should contain | |
1888 | * proper values on entry and other fields should be zero. On return, | |
1889 | * vm->addr contains the allocated address. | |
1890 | * | |
1891 | * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING. | |
1892 | */ | |
c0c0a293 | 1893 | void __init vm_area_register_early(struct vm_struct *vm, size_t align) |
f0aa6617 TH |
1894 | { |
1895 | static size_t vm_init_off __initdata; | |
c0c0a293 TH |
1896 | unsigned long addr; |
1897 | ||
1898 | addr = ALIGN(VMALLOC_START + vm_init_off, align); | |
1899 | vm_init_off = PFN_ALIGN(addr + vm->size) - VMALLOC_START; | |
f0aa6617 | 1900 | |
c0c0a293 | 1901 | vm->addr = (void *)addr; |
f0aa6617 | 1902 | |
be9b7335 | 1903 | vm_area_add_early(vm); |
f0aa6617 TH |
1904 | } |
1905 | ||
68ad4a33 URS |
1906 | static void vmap_init_free_space(void) |
1907 | { | |
1908 | unsigned long vmap_start = 1; | |
1909 | const unsigned long vmap_end = ULONG_MAX; | |
1910 | struct vmap_area *busy, *free; | |
1911 | ||
1912 | /* | |
1913 | * B F B B B F | |
1914 | * -|-----|.....|-----|-----|-----|.....|- | |
1915 | * | The KVA space | | |
1916 | * |<--------------------------------->| | |
1917 | */ | |
1918 | list_for_each_entry(busy, &vmap_area_list, list) { | |
1919 | if (busy->va_start - vmap_start > 0) { | |
1920 | free = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT); | |
1921 | if (!WARN_ON_ONCE(!free)) { | |
1922 | free->va_start = vmap_start; | |
1923 | free->va_end = busy->va_start; | |
1924 | ||
1925 | insert_vmap_area_augment(free, NULL, | |
1926 | &free_vmap_area_root, | |
1927 | &free_vmap_area_list); | |
1928 | } | |
1929 | } | |
1930 | ||
1931 | vmap_start = busy->va_end; | |
1932 | } | |
1933 | ||
1934 | if (vmap_end - vmap_start > 0) { | |
1935 | free = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT); | |
1936 | if (!WARN_ON_ONCE(!free)) { | |
1937 | free->va_start = vmap_start; | |
1938 | free->va_end = vmap_end; | |
1939 | ||
1940 | insert_vmap_area_augment(free, NULL, | |
1941 | &free_vmap_area_root, | |
1942 | &free_vmap_area_list); | |
1943 | } | |
1944 | } | |
1945 | } | |
1946 | ||
db64fe02 NP |
1947 | void __init vmalloc_init(void) |
1948 | { | |
822c18f2 IK |
1949 | struct vmap_area *va; |
1950 | struct vm_struct *tmp; | |
db64fe02 NP |
1951 | int i; |
1952 | ||
68ad4a33 URS |
1953 | /* |
1954 | * Create the cache for vmap_area objects. | |
1955 | */ | |
1956 | vmap_area_cachep = KMEM_CACHE(vmap_area, SLAB_PANIC); | |
1957 | ||
db64fe02 NP |
1958 | for_each_possible_cpu(i) { |
1959 | struct vmap_block_queue *vbq; | |
32fcfd40 | 1960 | struct vfree_deferred *p; |
db64fe02 NP |
1961 | |
1962 | vbq = &per_cpu(vmap_block_queue, i); | |
1963 | spin_lock_init(&vbq->lock); | |
1964 | INIT_LIST_HEAD(&vbq->free); | |
32fcfd40 AV |
1965 | p = &per_cpu(vfree_deferred, i); |
1966 | init_llist_head(&p->list); | |
1967 | INIT_WORK(&p->wq, free_work); | |
db64fe02 | 1968 | } |
9b463334 | 1969 | |
822c18f2 IK |
1970 | /* Import existing vmlist entries. */ |
1971 | for (tmp = vmlist; tmp; tmp = tmp->next) { | |
68ad4a33 URS |
1972 | va = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT); |
1973 | if (WARN_ON_ONCE(!va)) | |
1974 | continue; | |
1975 | ||
822c18f2 IK |
1976 | va->va_start = (unsigned long)tmp->addr; |
1977 | va->va_end = va->va_start + tmp->size; | |
dbda591d | 1978 | va->vm = tmp; |
68ad4a33 | 1979 | insert_vmap_area(va, &vmap_area_root, &vmap_area_list); |
822c18f2 | 1980 | } |
ca23e405 | 1981 | |
68ad4a33 URS |
1982 | /* |
1983 | * Now we can initialize a free vmap space. | |
1984 | */ | |
1985 | vmap_init_free_space(); | |
9b463334 | 1986 | vmap_initialized = true; |
db64fe02 NP |
1987 | } |
1988 | ||
8fc48985 TH |
1989 | /** |
1990 | * map_kernel_range_noflush - map kernel VM area with the specified pages | |
1991 | * @addr: start of the VM area to map | |
1992 | * @size: size of the VM area to map | |
1993 | * @prot: page protection flags to use | |
1994 | * @pages: pages to map | |
1995 | * | |
1996 | * Map PFN_UP(@size) pages at @addr. The VM area @addr and @size | |
1997 | * specify should have been allocated using get_vm_area() and its | |
1998 | * friends. | |
1999 | * | |
2000 | * NOTE: | |
2001 | * This function does NOT do any cache flushing. The caller is | |
2002 | * responsible for calling flush_cache_vmap() on to-be-mapped areas | |
2003 | * before calling this function. | |
2004 | * | |
2005 | * RETURNS: | |
2006 | * The number of pages mapped on success, -errno on failure. | |
2007 | */ | |
2008 | int map_kernel_range_noflush(unsigned long addr, unsigned long size, | |
2009 | pgprot_t prot, struct page **pages) | |
2010 | { | |
2011 | return vmap_page_range_noflush(addr, addr + size, prot, pages); | |
2012 | } | |
2013 | ||
2014 | /** | |
2015 | * unmap_kernel_range_noflush - unmap kernel VM area | |
2016 | * @addr: start of the VM area to unmap | |
2017 | * @size: size of the VM area to unmap | |
2018 | * | |
2019 | * Unmap PFN_UP(@size) pages at @addr. The VM area @addr and @size | |
2020 | * specify should have been allocated using get_vm_area() and its | |
2021 | * friends. | |
2022 | * | |
2023 | * NOTE: | |
2024 | * This function does NOT do any cache flushing. The caller is | |
2025 | * responsible for calling flush_cache_vunmap() on to-be-mapped areas | |
2026 | * before calling this function and flush_tlb_kernel_range() after. | |
2027 | */ | |
2028 | void unmap_kernel_range_noflush(unsigned long addr, unsigned long size) | |
2029 | { | |
2030 | vunmap_page_range(addr, addr + size); | |
2031 | } | |
81e88fdc | 2032 | EXPORT_SYMBOL_GPL(unmap_kernel_range_noflush); |
8fc48985 TH |
2033 | |
2034 | /** | |
2035 | * unmap_kernel_range - unmap kernel VM area and flush cache and TLB | |
2036 | * @addr: start of the VM area to unmap | |
2037 | * @size: size of the VM area to unmap | |
2038 | * | |
2039 | * Similar to unmap_kernel_range_noflush() but flushes vcache before | |
2040 | * the unmapping and tlb after. | |
2041 | */ | |
db64fe02 NP |
2042 | void unmap_kernel_range(unsigned long addr, unsigned long size) |
2043 | { | |
2044 | unsigned long end = addr + size; | |
f6fcba70 TH |
2045 | |
2046 | flush_cache_vunmap(addr, end); | |
db64fe02 NP |
2047 | vunmap_page_range(addr, end); |
2048 | flush_tlb_kernel_range(addr, end); | |
2049 | } | |
93ef6d6c | 2050 | EXPORT_SYMBOL_GPL(unmap_kernel_range); |
db64fe02 | 2051 | |
f6f8ed47 | 2052 | int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page **pages) |
db64fe02 NP |
2053 | { |
2054 | unsigned long addr = (unsigned long)area->addr; | |
762216ab | 2055 | unsigned long end = addr + get_vm_area_size(area); |
db64fe02 NP |
2056 | int err; |
2057 | ||
f6f8ed47 | 2058 | err = vmap_page_range(addr, end, prot, pages); |
db64fe02 | 2059 | |
f6f8ed47 | 2060 | return err > 0 ? 0 : err; |
db64fe02 NP |
2061 | } |
2062 | EXPORT_SYMBOL_GPL(map_vm_area); | |
2063 | ||
e36176be URS |
2064 | static inline void setup_vmalloc_vm_locked(struct vm_struct *vm, |
2065 | struct vmap_area *va, unsigned long flags, const void *caller) | |
cf88c790 | 2066 | { |
cf88c790 TH |
2067 | vm->flags = flags; |
2068 | vm->addr = (void *)va->va_start; | |
2069 | vm->size = va->va_end - va->va_start; | |
2070 | vm->caller = caller; | |
db1aecaf | 2071 | va->vm = vm; |
e36176be URS |
2072 | } |
2073 | ||
2074 | static void setup_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va, | |
2075 | unsigned long flags, const void *caller) | |
2076 | { | |
2077 | spin_lock(&vmap_area_lock); | |
2078 | setup_vmalloc_vm_locked(vm, va, flags, caller); | |
c69480ad | 2079 | spin_unlock(&vmap_area_lock); |
f5252e00 | 2080 | } |
cf88c790 | 2081 | |
20fc02b4 | 2082 | static void clear_vm_uninitialized_flag(struct vm_struct *vm) |
f5252e00 | 2083 | { |
d4033afd | 2084 | /* |
20fc02b4 | 2085 | * Before removing VM_UNINITIALIZED, |
d4033afd JK |
2086 | * we should make sure that vm has proper values. |
2087 | * Pair with smp_rmb() in show_numa_info(). | |
2088 | */ | |
2089 | smp_wmb(); | |
20fc02b4 | 2090 | vm->flags &= ~VM_UNINITIALIZED; |
cf88c790 TH |
2091 | } |
2092 | ||
db64fe02 | 2093 | static struct vm_struct *__get_vm_area_node(unsigned long size, |
2dca6999 | 2094 | unsigned long align, unsigned long flags, unsigned long start, |
5e6cafc8 | 2095 | unsigned long end, int node, gfp_t gfp_mask, const void *caller) |
db64fe02 | 2096 | { |
0006526d | 2097 | struct vmap_area *va; |
db64fe02 | 2098 | struct vm_struct *area; |
d98c9e83 | 2099 | unsigned long requested_size = size; |
1da177e4 | 2100 | |
52fd24ca | 2101 | BUG_ON(in_interrupt()); |
1da177e4 | 2102 | size = PAGE_ALIGN(size); |
31be8309 OH |
2103 | if (unlikely(!size)) |
2104 | return NULL; | |
1da177e4 | 2105 | |
252e5c6e | 2106 | if (flags & VM_IOREMAP) |
2107 | align = 1ul << clamp_t(int, get_count_order_long(size), | |
2108 | PAGE_SHIFT, IOREMAP_MAX_ORDER); | |
2109 | ||
cf88c790 | 2110 | area = kzalloc_node(sizeof(*area), gfp_mask & GFP_RECLAIM_MASK, node); |
1da177e4 LT |
2111 | if (unlikely(!area)) |
2112 | return NULL; | |
2113 | ||
71394fe5 AR |
2114 | if (!(flags & VM_NO_GUARD)) |
2115 | size += PAGE_SIZE; | |
1da177e4 | 2116 | |
db64fe02 NP |
2117 | va = alloc_vmap_area(size, align, start, end, node, gfp_mask); |
2118 | if (IS_ERR(va)) { | |
2119 | kfree(area); | |
2120 | return NULL; | |
1da177e4 | 2121 | } |
1da177e4 | 2122 | |
d98c9e83 | 2123 | kasan_unpoison_vmalloc((void *)va->va_start, requested_size); |
f5252e00 | 2124 | |
d98c9e83 | 2125 | setup_vmalloc_vm(area, va, flags, caller); |
3c5c3cfb | 2126 | |
1da177e4 | 2127 | return area; |
1da177e4 LT |
2128 | } |
2129 | ||
930fc45a CL |
2130 | struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, |
2131 | unsigned long start, unsigned long end) | |
2132 | { | |
00ef2d2f DR |
2133 | return __get_vm_area_node(size, 1, flags, start, end, NUMA_NO_NODE, |
2134 | GFP_KERNEL, __builtin_return_address(0)); | |
930fc45a | 2135 | } |
5992b6da | 2136 | EXPORT_SYMBOL_GPL(__get_vm_area); |
930fc45a | 2137 | |
c2968612 BH |
2138 | struct vm_struct *__get_vm_area_caller(unsigned long size, unsigned long flags, |
2139 | unsigned long start, unsigned long end, | |
5e6cafc8 | 2140 | const void *caller) |
c2968612 | 2141 | { |
00ef2d2f DR |
2142 | return __get_vm_area_node(size, 1, flags, start, end, NUMA_NO_NODE, |
2143 | GFP_KERNEL, caller); | |
c2968612 BH |
2144 | } |
2145 | ||
1da177e4 | 2146 | /** |
92eac168 MR |
2147 | * get_vm_area - reserve a contiguous kernel virtual area |
2148 | * @size: size of the area | |
2149 | * @flags: %VM_IOREMAP for I/O mappings or VM_ALLOC | |
1da177e4 | 2150 | * |
92eac168 MR |
2151 | * Search an area of @size in the kernel virtual mapping area, |
2152 | * and reserved it for out purposes. Returns the area descriptor | |
2153 | * on success or %NULL on failure. | |
a862f68a MR |
2154 | * |
2155 | * Return: the area descriptor on success or %NULL on failure. | |
1da177e4 LT |
2156 | */ |
2157 | struct vm_struct *get_vm_area(unsigned long size, unsigned long flags) | |
2158 | { | |
2dca6999 | 2159 | return __get_vm_area_node(size, 1, flags, VMALLOC_START, VMALLOC_END, |
00ef2d2f DR |
2160 | NUMA_NO_NODE, GFP_KERNEL, |
2161 | __builtin_return_address(0)); | |
23016969 CL |
2162 | } |
2163 | ||
2164 | struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags, | |
5e6cafc8 | 2165 | const void *caller) |
23016969 | 2166 | { |
2dca6999 | 2167 | return __get_vm_area_node(size, 1, flags, VMALLOC_START, VMALLOC_END, |
00ef2d2f | 2168 | NUMA_NO_NODE, GFP_KERNEL, caller); |
1da177e4 LT |
2169 | } |
2170 | ||
e9da6e99 | 2171 | /** |
92eac168 MR |
2172 | * find_vm_area - find a continuous kernel virtual area |
2173 | * @addr: base address | |
e9da6e99 | 2174 | * |
92eac168 MR |
2175 | * Search for the kernel VM area starting at @addr, and return it. |
2176 | * It is up to the caller to do all required locking to keep the returned | |
2177 | * pointer valid. | |
a862f68a MR |
2178 | * |
2179 | * Return: pointer to the found area or %NULL on faulure | |
e9da6e99 MS |
2180 | */ |
2181 | struct vm_struct *find_vm_area(const void *addr) | |
83342314 | 2182 | { |
db64fe02 | 2183 | struct vmap_area *va; |
83342314 | 2184 | |
db64fe02 | 2185 | va = find_vmap_area((unsigned long)addr); |
688fcbfc PL |
2186 | if (!va) |
2187 | return NULL; | |
1da177e4 | 2188 | |
688fcbfc | 2189 | return va->vm; |
1da177e4 LT |
2190 | } |
2191 | ||
7856dfeb | 2192 | /** |
92eac168 MR |
2193 | * remove_vm_area - find and remove a continuous kernel virtual area |
2194 | * @addr: base address | |
7856dfeb | 2195 | * |
92eac168 MR |
2196 | * Search for the kernel VM area starting at @addr, and remove it. |
2197 | * This function returns the found VM area, but using it is NOT safe | |
2198 | * on SMP machines, except for its size or flags. | |
a862f68a MR |
2199 | * |
2200 | * Return: pointer to the found area or %NULL on faulure | |
7856dfeb | 2201 | */ |
b3bdda02 | 2202 | struct vm_struct *remove_vm_area(const void *addr) |
7856dfeb | 2203 | { |
db64fe02 NP |
2204 | struct vmap_area *va; |
2205 | ||
5803ed29 CH |
2206 | might_sleep(); |
2207 | ||
dd3b8353 URS |
2208 | spin_lock(&vmap_area_lock); |
2209 | va = __find_vmap_area((unsigned long)addr); | |
688fcbfc | 2210 | if (va && va->vm) { |
db1aecaf | 2211 | struct vm_struct *vm = va->vm; |
f5252e00 | 2212 | |
c69480ad | 2213 | va->vm = NULL; |
c69480ad JK |
2214 | spin_unlock(&vmap_area_lock); |
2215 | ||
a5af5aa8 | 2216 | kasan_free_shadow(vm); |
dd32c279 | 2217 | free_unmap_vmap_area(va); |
dd32c279 | 2218 | |
db64fe02 NP |
2219 | return vm; |
2220 | } | |
dd3b8353 URS |
2221 | |
2222 | spin_unlock(&vmap_area_lock); | |
db64fe02 | 2223 | return NULL; |
7856dfeb AK |
2224 | } |
2225 | ||
868b104d RE |
2226 | static inline void set_area_direct_map(const struct vm_struct *area, |
2227 | int (*set_direct_map)(struct page *page)) | |
2228 | { | |
2229 | int i; | |
2230 | ||
2231 | for (i = 0; i < area->nr_pages; i++) | |
2232 | if (page_address(area->pages[i])) | |
2233 | set_direct_map(area->pages[i]); | |
2234 | } | |
2235 | ||
2236 | /* Handle removing and resetting vm mappings related to the vm_struct. */ | |
2237 | static void vm_remove_mappings(struct vm_struct *area, int deallocate_pages) | |
2238 | { | |
868b104d RE |
2239 | unsigned long start = ULONG_MAX, end = 0; |
2240 | int flush_reset = area->flags & VM_FLUSH_RESET_PERMS; | |
31e67340 | 2241 | int flush_dmap = 0; |
868b104d RE |
2242 | int i; |
2243 | ||
868b104d RE |
2244 | remove_vm_area(area->addr); |
2245 | ||
2246 | /* If this is not VM_FLUSH_RESET_PERMS memory, no need for the below. */ | |
2247 | if (!flush_reset) | |
2248 | return; | |
2249 | ||
2250 | /* | |
2251 | * If not deallocating pages, just do the flush of the VM area and | |
2252 | * return. | |
2253 | */ | |
2254 | if (!deallocate_pages) { | |
2255 | vm_unmap_aliases(); | |
2256 | return; | |
2257 | } | |
2258 | ||
2259 | /* | |
2260 | * If execution gets here, flush the vm mapping and reset the direct | |
2261 | * map. Find the start and end range of the direct mappings to make sure | |
2262 | * the vm_unmap_aliases() flush includes the direct map. | |
2263 | */ | |
2264 | for (i = 0; i < area->nr_pages; i++) { | |
8e41f872 RE |
2265 | unsigned long addr = (unsigned long)page_address(area->pages[i]); |
2266 | if (addr) { | |
868b104d | 2267 | start = min(addr, start); |
8e41f872 | 2268 | end = max(addr + PAGE_SIZE, end); |
31e67340 | 2269 | flush_dmap = 1; |
868b104d RE |
2270 | } |
2271 | } | |
2272 | ||
2273 | /* | |
2274 | * Set direct map to something invalid so that it won't be cached if | |
2275 | * there are any accesses after the TLB flush, then flush the TLB and | |
2276 | * reset the direct map permissions to the default. | |
2277 | */ | |
2278 | set_area_direct_map(area, set_direct_map_invalid_noflush); | |
31e67340 | 2279 | _vm_unmap_aliases(start, end, flush_dmap); |
868b104d RE |
2280 | set_area_direct_map(area, set_direct_map_default_noflush); |
2281 | } | |
2282 | ||
b3bdda02 | 2283 | static void __vunmap(const void *addr, int deallocate_pages) |
1da177e4 LT |
2284 | { |
2285 | struct vm_struct *area; | |
2286 | ||
2287 | if (!addr) | |
2288 | return; | |
2289 | ||
e69e9d4a | 2290 | if (WARN(!PAGE_ALIGNED(addr), "Trying to vfree() bad address (%p)\n", |
ab15d9b4 | 2291 | addr)) |
1da177e4 | 2292 | return; |
1da177e4 | 2293 | |
6ade2032 | 2294 | area = find_vm_area(addr); |
1da177e4 | 2295 | if (unlikely(!area)) { |
4c8573e2 | 2296 | WARN(1, KERN_ERR "Trying to vfree() nonexistent vm area (%p)\n", |
1da177e4 | 2297 | addr); |
1da177e4 LT |
2298 | return; |
2299 | } | |
2300 | ||
05e3ff95 CP |
2301 | debug_check_no_locks_freed(area->addr, get_vm_area_size(area)); |
2302 | debug_check_no_obj_freed(area->addr, get_vm_area_size(area)); | |
9a11b49a | 2303 | |
d98c9e83 | 2304 | kasan_poison_vmalloc(area->addr, area->size); |
3c5c3cfb | 2305 | |
868b104d RE |
2306 | vm_remove_mappings(area, deallocate_pages); |
2307 | ||
1da177e4 LT |
2308 | if (deallocate_pages) { |
2309 | int i; | |
2310 | ||
2311 | for (i = 0; i < area->nr_pages; i++) { | |
bf53d6f8 CL |
2312 | struct page *page = area->pages[i]; |
2313 | ||
2314 | BUG_ON(!page); | |
4949148a | 2315 | __free_pages(page, 0); |
1da177e4 | 2316 | } |
97105f0a | 2317 | atomic_long_sub(area->nr_pages, &nr_vmalloc_pages); |
1da177e4 | 2318 | |
244d63ee | 2319 | kvfree(area->pages); |
1da177e4 LT |
2320 | } |
2321 | ||
2322 | kfree(area); | |
2323 | return; | |
2324 | } | |
bf22e37a AR |
2325 | |
2326 | static inline void __vfree_deferred(const void *addr) | |
2327 | { | |
2328 | /* | |
2329 | * Use raw_cpu_ptr() because this can be called from preemptible | |
2330 | * context. Preemption is absolutely fine here, because the llist_add() | |
2331 | * implementation is lockless, so it works even if we are adding to | |
2332 | * nother cpu's list. schedule_work() should be fine with this too. | |
2333 | */ | |
2334 | struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred); | |
2335 | ||
2336 | if (llist_add((struct llist_node *)addr, &p->list)) | |
2337 | schedule_work(&p->wq); | |
2338 | } | |
2339 | ||
2340 | /** | |
92eac168 MR |
2341 | * vfree_atomic - release memory allocated by vmalloc() |
2342 | * @addr: memory base address | |
bf22e37a | 2343 | * |
92eac168 MR |
2344 | * This one is just like vfree() but can be called in any atomic context |
2345 | * except NMIs. | |
bf22e37a AR |
2346 | */ |
2347 | void vfree_atomic(const void *addr) | |
2348 | { | |
2349 | BUG_ON(in_nmi()); | |
2350 | ||
2351 | kmemleak_free(addr); | |
2352 | ||
2353 | if (!addr) | |
2354 | return; | |
2355 | __vfree_deferred(addr); | |
2356 | } | |
2357 | ||
c67dc624 RP |
2358 | static void __vfree(const void *addr) |
2359 | { | |
2360 | if (unlikely(in_interrupt())) | |
2361 | __vfree_deferred(addr); | |
2362 | else | |
2363 | __vunmap(addr, 1); | |
2364 | } | |
2365 | ||
1da177e4 | 2366 | /** |
92eac168 MR |
2367 | * vfree - release memory allocated by vmalloc() |
2368 | * @addr: memory base address | |
1da177e4 | 2369 | * |
92eac168 MR |
2370 | * Free the virtually continuous memory area starting at @addr, as |
2371 | * obtained from vmalloc(), vmalloc_32() or __vmalloc(). If @addr is | |
2372 | * NULL, no operation is performed. | |
1da177e4 | 2373 | * |
92eac168 MR |
2374 | * Must not be called in NMI context (strictly speaking, only if we don't |
2375 | * have CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG, but making the calling | |
2376 | * conventions for vfree() arch-depenedent would be a really bad idea) | |
c9fcee51 | 2377 | * |
92eac168 | 2378 | * May sleep if called *not* from interrupt context. |
3ca4ea3a | 2379 | * |
92eac168 | 2380 | * NOTE: assumes that the object at @addr has a size >= sizeof(llist_node) |
1da177e4 | 2381 | */ |
b3bdda02 | 2382 | void vfree(const void *addr) |
1da177e4 | 2383 | { |
32fcfd40 | 2384 | BUG_ON(in_nmi()); |
89219d37 CM |
2385 | |
2386 | kmemleak_free(addr); | |
2387 | ||
a8dda165 AR |
2388 | might_sleep_if(!in_interrupt()); |
2389 | ||
32fcfd40 AV |
2390 | if (!addr) |
2391 | return; | |
c67dc624 RP |
2392 | |
2393 | __vfree(addr); | |
1da177e4 | 2394 | } |
1da177e4 LT |
2395 | EXPORT_SYMBOL(vfree); |
2396 | ||
2397 | /** | |
92eac168 MR |
2398 | * vunmap - release virtual mapping obtained by vmap() |
2399 | * @addr: memory base address | |
1da177e4 | 2400 | * |
92eac168 MR |
2401 | * Free the virtually contiguous memory area starting at @addr, |
2402 | * which was created from the page array passed to vmap(). | |
1da177e4 | 2403 | * |
92eac168 | 2404 | * Must not be called in interrupt context. |
1da177e4 | 2405 | */ |
b3bdda02 | 2406 | void vunmap(const void *addr) |
1da177e4 LT |
2407 | { |
2408 | BUG_ON(in_interrupt()); | |
34754b69 | 2409 | might_sleep(); |
32fcfd40 AV |
2410 | if (addr) |
2411 | __vunmap(addr, 0); | |
1da177e4 | 2412 | } |
1da177e4 LT |
2413 | EXPORT_SYMBOL(vunmap); |
2414 | ||
2415 | /** | |
92eac168 MR |
2416 | * vmap - map an array of pages into virtually contiguous space |
2417 | * @pages: array of page pointers | |
2418 | * @count: number of pages to map | |
2419 | * @flags: vm_area->flags | |
2420 | * @prot: page protection for the mapping | |
2421 | * | |
2422 | * Maps @count pages from @pages into contiguous kernel virtual | |
2423 | * space. | |
a862f68a MR |
2424 | * |
2425 | * Return: the address of the area or %NULL on failure | |
1da177e4 LT |
2426 | */ |
2427 | void *vmap(struct page **pages, unsigned int count, | |
92eac168 | 2428 | unsigned long flags, pgprot_t prot) |
1da177e4 LT |
2429 | { |
2430 | struct vm_struct *area; | |
65ee03c4 | 2431 | unsigned long size; /* In bytes */ |
1da177e4 | 2432 | |
34754b69 PZ |
2433 | might_sleep(); |
2434 | ||
ca79b0c2 | 2435 | if (count > totalram_pages()) |
1da177e4 LT |
2436 | return NULL; |
2437 | ||
65ee03c4 GJM |
2438 | size = (unsigned long)count << PAGE_SHIFT; |
2439 | area = get_vm_area_caller(size, flags, __builtin_return_address(0)); | |
1da177e4 LT |
2440 | if (!area) |
2441 | return NULL; | |
23016969 | 2442 | |
f6f8ed47 | 2443 | if (map_vm_area(area, prot, pages)) { |
1da177e4 LT |
2444 | vunmap(area->addr); |
2445 | return NULL; | |
2446 | } | |
2447 | ||
2448 | return area->addr; | |
2449 | } | |
1da177e4 LT |
2450 | EXPORT_SYMBOL(vmap); |
2451 | ||
8594a21c MH |
2452 | static void *__vmalloc_node(unsigned long size, unsigned long align, |
2453 | gfp_t gfp_mask, pgprot_t prot, | |
2454 | int node, const void *caller); | |
e31d9eb5 | 2455 | static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, |
3722e13c | 2456 | pgprot_t prot, int node) |
1da177e4 LT |
2457 | { |
2458 | struct page **pages; | |
2459 | unsigned int nr_pages, array_size, i; | |
930f036b | 2460 | const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO; |
704b862f LA |
2461 | const gfp_t alloc_mask = gfp_mask | __GFP_NOWARN; |
2462 | const gfp_t highmem_mask = (gfp_mask & (GFP_DMA | GFP_DMA32)) ? | |
2463 | 0 : | |
2464 | __GFP_HIGHMEM; | |
1da177e4 | 2465 | |
762216ab | 2466 | nr_pages = get_vm_area_size(area) >> PAGE_SHIFT; |
1da177e4 LT |
2467 | array_size = (nr_pages * sizeof(struct page *)); |
2468 | ||
1da177e4 | 2469 | /* Please note that the recursion is strictly bounded. */ |
8757d5fa | 2470 | if (array_size > PAGE_SIZE) { |
704b862f | 2471 | pages = __vmalloc_node(array_size, 1, nested_gfp|highmem_mask, |
3722e13c | 2472 | PAGE_KERNEL, node, area->caller); |
286e1ea3 | 2473 | } else { |
976d6dfb | 2474 | pages = kmalloc_node(array_size, nested_gfp, node); |
286e1ea3 | 2475 | } |
7ea36242 AK |
2476 | |
2477 | if (!pages) { | |
1da177e4 LT |
2478 | remove_vm_area(area->addr); |
2479 | kfree(area); | |
2480 | return NULL; | |
2481 | } | |
1da177e4 | 2482 | |
7ea36242 AK |
2483 | area->pages = pages; |
2484 | area->nr_pages = nr_pages; | |
2485 | ||
1da177e4 | 2486 | for (i = 0; i < area->nr_pages; i++) { |
bf53d6f8 CL |
2487 | struct page *page; |
2488 | ||
4b90951c | 2489 | if (node == NUMA_NO_NODE) |
704b862f | 2490 | page = alloc_page(alloc_mask|highmem_mask); |
930fc45a | 2491 | else |
704b862f | 2492 | page = alloc_pages_node(node, alloc_mask|highmem_mask, 0); |
bf53d6f8 CL |
2493 | |
2494 | if (unlikely(!page)) { | |
1da177e4 LT |
2495 | /* Successfully allocated i pages, free them in __vunmap() */ |
2496 | area->nr_pages = i; | |
97105f0a | 2497 | atomic_long_add(area->nr_pages, &nr_vmalloc_pages); |
1da177e4 LT |
2498 | goto fail; |
2499 | } | |
bf53d6f8 | 2500 | area->pages[i] = page; |
dcf61ff0 | 2501 | if (gfpflags_allow_blocking(gfp_mask)) |
660654f9 | 2502 | cond_resched(); |
1da177e4 | 2503 | } |
97105f0a | 2504 | atomic_long_add(area->nr_pages, &nr_vmalloc_pages); |
1da177e4 | 2505 | |
f6f8ed47 | 2506 | if (map_vm_area(area, prot, pages)) |
1da177e4 LT |
2507 | goto fail; |
2508 | return area->addr; | |
2509 | ||
2510 | fail: | |
a8e99259 | 2511 | warn_alloc(gfp_mask, NULL, |
7877cdcc | 2512 | "vmalloc: allocation failure, allocated %ld of %ld bytes", |
22943ab1 | 2513 | (area->nr_pages*PAGE_SIZE), area->size); |
c67dc624 | 2514 | __vfree(area->addr); |
1da177e4 LT |
2515 | return NULL; |
2516 | } | |
2517 | ||
2518 | /** | |
92eac168 MR |
2519 | * __vmalloc_node_range - allocate virtually contiguous memory |
2520 | * @size: allocation size | |
2521 | * @align: desired alignment | |
2522 | * @start: vm area range start | |
2523 | * @end: vm area range end | |
2524 | * @gfp_mask: flags for the page level allocator | |
2525 | * @prot: protection mask for the allocated pages | |
2526 | * @vm_flags: additional vm area flags (e.g. %VM_NO_GUARD) | |
2527 | * @node: node to use for allocation or NUMA_NO_NODE | |
2528 | * @caller: caller's return address | |
2529 | * | |
2530 | * Allocate enough pages to cover @size from the page level | |
2531 | * allocator with @gfp_mask flags. Map them into contiguous | |
2532 | * kernel virtual space, using a pagetable protection of @prot. | |
a862f68a MR |
2533 | * |
2534 | * Return: the address of the area or %NULL on failure | |
1da177e4 | 2535 | */ |
d0a21265 DR |
2536 | void *__vmalloc_node_range(unsigned long size, unsigned long align, |
2537 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
cb9e3c29 AR |
2538 | pgprot_t prot, unsigned long vm_flags, int node, |
2539 | const void *caller) | |
1da177e4 LT |
2540 | { |
2541 | struct vm_struct *area; | |
89219d37 CM |
2542 | void *addr; |
2543 | unsigned long real_size = size; | |
1da177e4 LT |
2544 | |
2545 | size = PAGE_ALIGN(size); | |
ca79b0c2 | 2546 | if (!size || (size >> PAGE_SHIFT) > totalram_pages()) |
de7d2b56 | 2547 | goto fail; |
1da177e4 | 2548 | |
d98c9e83 | 2549 | area = __get_vm_area_node(real_size, align, VM_ALLOC | VM_UNINITIALIZED | |
cb9e3c29 | 2550 | vm_flags, start, end, node, gfp_mask, caller); |
1da177e4 | 2551 | if (!area) |
de7d2b56 | 2552 | goto fail; |
1da177e4 | 2553 | |
3722e13c | 2554 | addr = __vmalloc_area_node(area, gfp_mask, prot, node); |
1368edf0 | 2555 | if (!addr) |
b82225f3 | 2556 | return NULL; |
89219d37 | 2557 | |
f5252e00 | 2558 | /* |
20fc02b4 ZY |
2559 | * In this function, newly allocated vm_struct has VM_UNINITIALIZED |
2560 | * flag. It means that vm_struct is not fully initialized. | |
4341fa45 | 2561 | * Now, it is fully initialized, so remove this flag here. |
f5252e00 | 2562 | */ |
20fc02b4 | 2563 | clear_vm_uninitialized_flag(area); |
f5252e00 | 2564 | |
94f4a161 | 2565 | kmemleak_vmalloc(area, size, gfp_mask); |
89219d37 CM |
2566 | |
2567 | return addr; | |
de7d2b56 JP |
2568 | |
2569 | fail: | |
a8e99259 | 2570 | warn_alloc(gfp_mask, NULL, |
7877cdcc | 2571 | "vmalloc: allocation failure: %lu bytes", real_size); |
de7d2b56 | 2572 | return NULL; |
1da177e4 LT |
2573 | } |
2574 | ||
153178ed URS |
2575 | /* |
2576 | * This is only for performance analysis of vmalloc and stress purpose. | |
2577 | * It is required by vmalloc test module, therefore do not use it other | |
2578 | * than that. | |
2579 | */ | |
2580 | #ifdef CONFIG_TEST_VMALLOC_MODULE | |
2581 | EXPORT_SYMBOL_GPL(__vmalloc_node_range); | |
2582 | #endif | |
2583 | ||
d0a21265 | 2584 | /** |
92eac168 MR |
2585 | * __vmalloc_node - allocate virtually contiguous memory |
2586 | * @size: allocation size | |
2587 | * @align: desired alignment | |
2588 | * @gfp_mask: flags for the page level allocator | |
2589 | * @prot: protection mask for the allocated pages | |
2590 | * @node: node to use for allocation or NUMA_NO_NODE | |
2591 | * @caller: caller's return address | |
a7c3e901 | 2592 | * |
92eac168 MR |
2593 | * Allocate enough pages to cover @size from the page level |
2594 | * allocator with @gfp_mask flags. Map them into contiguous | |
2595 | * kernel virtual space, using a pagetable protection of @prot. | |
a7c3e901 | 2596 | * |
92eac168 MR |
2597 | * Reclaim modifiers in @gfp_mask - __GFP_NORETRY, __GFP_RETRY_MAYFAIL |
2598 | * and __GFP_NOFAIL are not supported | |
a7c3e901 | 2599 | * |
92eac168 MR |
2600 | * Any use of gfp flags outside of GFP_KERNEL should be consulted |
2601 | * with mm people. | |
a862f68a MR |
2602 | * |
2603 | * Return: pointer to the allocated memory or %NULL on error | |
d0a21265 | 2604 | */ |
8594a21c | 2605 | static void *__vmalloc_node(unsigned long size, unsigned long align, |
d0a21265 | 2606 | gfp_t gfp_mask, pgprot_t prot, |
5e6cafc8 | 2607 | int node, const void *caller) |
d0a21265 DR |
2608 | { |
2609 | return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END, | |
cb9e3c29 | 2610 | gfp_mask, prot, 0, node, caller); |
d0a21265 DR |
2611 | } |
2612 | ||
930fc45a CL |
2613 | void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot) |
2614 | { | |
00ef2d2f | 2615 | return __vmalloc_node(size, 1, gfp_mask, prot, NUMA_NO_NODE, |
23016969 | 2616 | __builtin_return_address(0)); |
930fc45a | 2617 | } |
1da177e4 LT |
2618 | EXPORT_SYMBOL(__vmalloc); |
2619 | ||
8594a21c MH |
2620 | static inline void *__vmalloc_node_flags(unsigned long size, |
2621 | int node, gfp_t flags) | |
2622 | { | |
2623 | return __vmalloc_node(size, 1, flags, PAGE_KERNEL, | |
2624 | node, __builtin_return_address(0)); | |
2625 | } | |
2626 | ||
2627 | ||
2628 | void *__vmalloc_node_flags_caller(unsigned long size, int node, gfp_t flags, | |
2629 | void *caller) | |
2630 | { | |
2631 | return __vmalloc_node(size, 1, flags, PAGE_KERNEL, node, caller); | |
2632 | } | |
2633 | ||
1da177e4 | 2634 | /** |
92eac168 MR |
2635 | * vmalloc - allocate virtually contiguous memory |
2636 | * @size: allocation size | |
2637 | * | |
2638 | * Allocate enough pages to cover @size from the page level | |
2639 | * allocator and map them into contiguous kernel virtual space. | |
1da177e4 | 2640 | * |
92eac168 MR |
2641 | * For tight control over page level allocator and protection flags |
2642 | * use __vmalloc() instead. | |
a862f68a MR |
2643 | * |
2644 | * Return: pointer to the allocated memory or %NULL on error | |
1da177e4 LT |
2645 | */ |
2646 | void *vmalloc(unsigned long size) | |
2647 | { | |
00ef2d2f | 2648 | return __vmalloc_node_flags(size, NUMA_NO_NODE, |
19809c2d | 2649 | GFP_KERNEL); |
1da177e4 | 2650 | } |
1da177e4 LT |
2651 | EXPORT_SYMBOL(vmalloc); |
2652 | ||
e1ca7788 | 2653 | /** |
92eac168 MR |
2654 | * vzalloc - allocate virtually contiguous memory with zero fill |
2655 | * @size: allocation size | |
2656 | * | |
2657 | * Allocate enough pages to cover @size from the page level | |
2658 | * allocator and map them into contiguous kernel virtual space. | |
2659 | * The memory allocated is set to zero. | |
2660 | * | |
2661 | * For tight control over page level allocator and protection flags | |
2662 | * use __vmalloc() instead. | |
a862f68a MR |
2663 | * |
2664 | * Return: pointer to the allocated memory or %NULL on error | |
e1ca7788 DY |
2665 | */ |
2666 | void *vzalloc(unsigned long size) | |
2667 | { | |
00ef2d2f | 2668 | return __vmalloc_node_flags(size, NUMA_NO_NODE, |
19809c2d | 2669 | GFP_KERNEL | __GFP_ZERO); |
e1ca7788 DY |
2670 | } |
2671 | EXPORT_SYMBOL(vzalloc); | |
2672 | ||
83342314 | 2673 | /** |
ead04089 REB |
2674 | * vmalloc_user - allocate zeroed virtually contiguous memory for userspace |
2675 | * @size: allocation size | |
83342314 | 2676 | * |
ead04089 REB |
2677 | * The resulting memory area is zeroed so it can be mapped to userspace |
2678 | * without leaking data. | |
a862f68a MR |
2679 | * |
2680 | * Return: pointer to the allocated memory or %NULL on error | |
83342314 NP |
2681 | */ |
2682 | void *vmalloc_user(unsigned long size) | |
2683 | { | |
bc84c535 RP |
2684 | return __vmalloc_node_range(size, SHMLBA, VMALLOC_START, VMALLOC_END, |
2685 | GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL, | |
2686 | VM_USERMAP, NUMA_NO_NODE, | |
2687 | __builtin_return_address(0)); | |
83342314 NP |
2688 | } |
2689 | EXPORT_SYMBOL(vmalloc_user); | |
2690 | ||
930fc45a | 2691 | /** |
92eac168 MR |
2692 | * vmalloc_node - allocate memory on a specific node |
2693 | * @size: allocation size | |
2694 | * @node: numa node | |
930fc45a | 2695 | * |
92eac168 MR |
2696 | * Allocate enough pages to cover @size from the page level |
2697 | * allocator and map them into contiguous kernel virtual space. | |
930fc45a | 2698 | * |
92eac168 MR |
2699 | * For tight control over page level allocator and protection flags |
2700 | * use __vmalloc() instead. | |
a862f68a MR |
2701 | * |
2702 | * Return: pointer to the allocated memory or %NULL on error | |
930fc45a CL |
2703 | */ |
2704 | void *vmalloc_node(unsigned long size, int node) | |
2705 | { | |
19809c2d | 2706 | return __vmalloc_node(size, 1, GFP_KERNEL, PAGE_KERNEL, |
23016969 | 2707 | node, __builtin_return_address(0)); |
930fc45a CL |
2708 | } |
2709 | EXPORT_SYMBOL(vmalloc_node); | |
2710 | ||
e1ca7788 DY |
2711 | /** |
2712 | * vzalloc_node - allocate memory on a specific node with zero fill | |
2713 | * @size: allocation size | |
2714 | * @node: numa node | |
2715 | * | |
2716 | * Allocate enough pages to cover @size from the page level | |
2717 | * allocator and map them into contiguous kernel virtual space. | |
2718 | * The memory allocated is set to zero. | |
2719 | * | |
2720 | * For tight control over page level allocator and protection flags | |
2721 | * use __vmalloc_node() instead. | |
a862f68a MR |
2722 | * |
2723 | * Return: pointer to the allocated memory or %NULL on error | |
e1ca7788 DY |
2724 | */ |
2725 | void *vzalloc_node(unsigned long size, int node) | |
2726 | { | |
2727 | return __vmalloc_node_flags(size, node, | |
19809c2d | 2728 | GFP_KERNEL | __GFP_ZERO); |
e1ca7788 DY |
2729 | } |
2730 | EXPORT_SYMBOL(vzalloc_node); | |
2731 | ||
fc970227 AN |
2732 | /** |
2733 | * vmalloc_user_node_flags - allocate memory for userspace on a specific node | |
2734 | * @size: allocation size | |
2735 | * @node: numa node | |
2736 | * @flags: flags for the page level allocator | |
2737 | * | |
2738 | * The resulting memory area is zeroed so it can be mapped to userspace | |
2739 | * without leaking data. | |
2740 | * | |
2741 | * Return: pointer to the allocated memory or %NULL on error | |
2742 | */ | |
2743 | void *vmalloc_user_node_flags(unsigned long size, int node, gfp_t flags) | |
2744 | { | |
2745 | return __vmalloc_node_range(size, SHMLBA, VMALLOC_START, VMALLOC_END, | |
2746 | flags | __GFP_ZERO, PAGE_KERNEL, | |
2747 | VM_USERMAP, node, | |
2748 | __builtin_return_address(0)); | |
2749 | } | |
2750 | EXPORT_SYMBOL(vmalloc_user_node_flags); | |
2751 | ||
1da177e4 | 2752 | /** |
92eac168 MR |
2753 | * vmalloc_exec - allocate virtually contiguous, executable memory |
2754 | * @size: allocation size | |
1da177e4 | 2755 | * |
92eac168 MR |
2756 | * Kernel-internal function to allocate enough pages to cover @size |
2757 | * the page level allocator and map them into contiguous and | |
2758 | * executable kernel virtual space. | |
1da177e4 | 2759 | * |
92eac168 MR |
2760 | * For tight control over page level allocator and protection flags |
2761 | * use __vmalloc() instead. | |
a862f68a MR |
2762 | * |
2763 | * Return: pointer to the allocated memory or %NULL on error | |
1da177e4 | 2764 | */ |
1da177e4 LT |
2765 | void *vmalloc_exec(unsigned long size) |
2766 | { | |
868b104d RE |
2767 | return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, |
2768 | GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS, | |
2769 | NUMA_NO_NODE, __builtin_return_address(0)); | |
1da177e4 LT |
2770 | } |
2771 | ||
0d08e0d3 | 2772 | #if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32) |
698d0831 | 2773 | #define GFP_VMALLOC32 (GFP_DMA32 | GFP_KERNEL) |
0d08e0d3 | 2774 | #elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA) |
698d0831 | 2775 | #define GFP_VMALLOC32 (GFP_DMA | GFP_KERNEL) |
0d08e0d3 | 2776 | #else |
698d0831 MH |
2777 | /* |
2778 | * 64b systems should always have either DMA or DMA32 zones. For others | |
2779 | * GFP_DMA32 should do the right thing and use the normal zone. | |
2780 | */ | |
2781 | #define GFP_VMALLOC32 GFP_DMA32 | GFP_KERNEL | |
0d08e0d3 AK |
2782 | #endif |
2783 | ||
1da177e4 | 2784 | /** |
92eac168 MR |
2785 | * vmalloc_32 - allocate virtually contiguous memory (32bit addressable) |
2786 | * @size: allocation size | |
1da177e4 | 2787 | * |
92eac168 MR |
2788 | * Allocate enough 32bit PA addressable pages to cover @size from the |
2789 | * page level allocator and map them into contiguous kernel virtual space. | |
a862f68a MR |
2790 | * |
2791 | * Return: pointer to the allocated memory or %NULL on error | |
1da177e4 LT |
2792 | */ |
2793 | void *vmalloc_32(unsigned long size) | |
2794 | { | |
2dca6999 | 2795 | return __vmalloc_node(size, 1, GFP_VMALLOC32, PAGE_KERNEL, |
00ef2d2f | 2796 | NUMA_NO_NODE, __builtin_return_address(0)); |
1da177e4 | 2797 | } |
1da177e4 LT |
2798 | EXPORT_SYMBOL(vmalloc_32); |
2799 | ||
83342314 | 2800 | /** |
ead04089 | 2801 | * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory |
92eac168 | 2802 | * @size: allocation size |
ead04089 REB |
2803 | * |
2804 | * The resulting memory area is 32bit addressable and zeroed so it can be | |
2805 | * mapped to userspace without leaking data. | |
a862f68a MR |
2806 | * |
2807 | * Return: pointer to the allocated memory or %NULL on error | |
83342314 NP |
2808 | */ |
2809 | void *vmalloc_32_user(unsigned long size) | |
2810 | { | |
bc84c535 RP |
2811 | return __vmalloc_node_range(size, SHMLBA, VMALLOC_START, VMALLOC_END, |
2812 | GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL, | |
2813 | VM_USERMAP, NUMA_NO_NODE, | |
2814 | __builtin_return_address(0)); | |
83342314 NP |
2815 | } |
2816 | EXPORT_SYMBOL(vmalloc_32_user); | |
2817 | ||
d0107eb0 KH |
2818 | /* |
2819 | * small helper routine , copy contents to buf from addr. | |
2820 | * If the page is not present, fill zero. | |
2821 | */ | |
2822 | ||
2823 | static int aligned_vread(char *buf, char *addr, unsigned long count) | |
2824 | { | |
2825 | struct page *p; | |
2826 | int copied = 0; | |
2827 | ||
2828 | while (count) { | |
2829 | unsigned long offset, length; | |
2830 | ||
891c49ab | 2831 | offset = offset_in_page(addr); |
d0107eb0 KH |
2832 | length = PAGE_SIZE - offset; |
2833 | if (length > count) | |
2834 | length = count; | |
2835 | p = vmalloc_to_page(addr); | |
2836 | /* | |
2837 | * To do safe access to this _mapped_ area, we need | |
2838 | * lock. But adding lock here means that we need to add | |
2839 | * overhead of vmalloc()/vfree() calles for this _debug_ | |
2840 | * interface, rarely used. Instead of that, we'll use | |
2841 | * kmap() and get small overhead in this access function. | |
2842 | */ | |
2843 | if (p) { | |
2844 | /* | |
2845 | * we can expect USER0 is not used (see vread/vwrite's | |
2846 | * function description) | |
2847 | */ | |
9b04c5fe | 2848 | void *map = kmap_atomic(p); |
d0107eb0 | 2849 | memcpy(buf, map + offset, length); |
9b04c5fe | 2850 | kunmap_atomic(map); |
d0107eb0 KH |
2851 | } else |
2852 | memset(buf, 0, length); | |
2853 | ||
2854 | addr += length; | |
2855 | buf += length; | |
2856 | copied += length; | |
2857 | count -= length; | |
2858 | } | |
2859 | return copied; | |
2860 | } | |
2861 | ||
2862 | static int aligned_vwrite(char *buf, char *addr, unsigned long count) | |
2863 | { | |
2864 | struct page *p; | |
2865 | int copied = 0; | |
2866 | ||
2867 | while (count) { | |
2868 | unsigned long offset, length; | |
2869 | ||
891c49ab | 2870 | offset = offset_in_page(addr); |
d0107eb0 KH |
2871 | length = PAGE_SIZE - offset; |
2872 | if (length > count) | |
2873 | length = count; | |
2874 | p = vmalloc_to_page(addr); | |
2875 | /* | |
2876 | * To do safe access to this _mapped_ area, we need | |
2877 | * lock. But adding lock here means that we need to add | |
2878 | * overhead of vmalloc()/vfree() calles for this _debug_ | |
2879 | * interface, rarely used. Instead of that, we'll use | |
2880 | * kmap() and get small overhead in this access function. | |
2881 | */ | |
2882 | if (p) { | |
2883 | /* | |
2884 | * we can expect USER0 is not used (see vread/vwrite's | |
2885 | * function description) | |
2886 | */ | |
9b04c5fe | 2887 | void *map = kmap_atomic(p); |
d0107eb0 | 2888 | memcpy(map + offset, buf, length); |
9b04c5fe | 2889 | kunmap_atomic(map); |
d0107eb0 KH |
2890 | } |
2891 | addr += length; | |
2892 | buf += length; | |
2893 | copied += length; | |
2894 | count -= length; | |
2895 | } | |
2896 | return copied; | |
2897 | } | |
2898 | ||
2899 | /** | |
92eac168 MR |
2900 | * vread() - read vmalloc area in a safe way. |
2901 | * @buf: buffer for reading data | |
2902 | * @addr: vm address. | |
2903 | * @count: number of bytes to be read. | |
2904 | * | |
92eac168 MR |
2905 | * This function checks that addr is a valid vmalloc'ed area, and |
2906 | * copy data from that area to a given buffer. If the given memory range | |
2907 | * of [addr...addr+count) includes some valid address, data is copied to | |
2908 | * proper area of @buf. If there are memory holes, they'll be zero-filled. | |
2909 | * IOREMAP area is treated as memory hole and no copy is done. | |
2910 | * | |
2911 | * If [addr...addr+count) doesn't includes any intersects with alive | |
2912 | * vm_struct area, returns 0. @buf should be kernel's buffer. | |
2913 | * | |
2914 | * Note: In usual ops, vread() is never necessary because the caller | |
2915 | * should know vmalloc() area is valid and can use memcpy(). | |
2916 | * This is for routines which have to access vmalloc area without | |
d9009d67 | 2917 | * any information, as /dev/kmem. |
a862f68a MR |
2918 | * |
2919 | * Return: number of bytes for which addr and buf should be increased | |
2920 | * (same number as @count) or %0 if [addr...addr+count) doesn't | |
2921 | * include any intersection with valid vmalloc area | |
d0107eb0 | 2922 | */ |
1da177e4 LT |
2923 | long vread(char *buf, char *addr, unsigned long count) |
2924 | { | |
e81ce85f JK |
2925 | struct vmap_area *va; |
2926 | struct vm_struct *vm; | |
1da177e4 | 2927 | char *vaddr, *buf_start = buf; |
d0107eb0 | 2928 | unsigned long buflen = count; |
1da177e4 LT |
2929 | unsigned long n; |
2930 | ||
2931 | /* Don't allow overflow */ | |
2932 | if ((unsigned long) addr + count < count) | |
2933 | count = -(unsigned long) addr; | |
2934 | ||
e81ce85f JK |
2935 | spin_lock(&vmap_area_lock); |
2936 | list_for_each_entry(va, &vmap_area_list, list) { | |
2937 | if (!count) | |
2938 | break; | |
2939 | ||
688fcbfc | 2940 | if (!va->vm) |
e81ce85f JK |
2941 | continue; |
2942 | ||
2943 | vm = va->vm; | |
2944 | vaddr = (char *) vm->addr; | |
762216ab | 2945 | if (addr >= vaddr + get_vm_area_size(vm)) |
1da177e4 LT |
2946 | continue; |
2947 | while (addr < vaddr) { | |
2948 | if (count == 0) | |
2949 | goto finished; | |
2950 | *buf = '\0'; | |
2951 | buf++; | |
2952 | addr++; | |
2953 | count--; | |
2954 | } | |
762216ab | 2955 | n = vaddr + get_vm_area_size(vm) - addr; |
d0107eb0 KH |
2956 | if (n > count) |
2957 | n = count; | |
e81ce85f | 2958 | if (!(vm->flags & VM_IOREMAP)) |
d0107eb0 KH |
2959 | aligned_vread(buf, addr, n); |
2960 | else /* IOREMAP area is treated as memory hole */ | |
2961 | memset(buf, 0, n); | |
2962 | buf += n; | |
2963 | addr += n; | |
2964 | count -= n; | |
1da177e4 LT |
2965 | } |
2966 | finished: | |
e81ce85f | 2967 | spin_unlock(&vmap_area_lock); |
d0107eb0 KH |
2968 | |
2969 | if (buf == buf_start) | |
2970 | return 0; | |
2971 | /* zero-fill memory holes */ | |
2972 | if (buf != buf_start + buflen) | |
2973 | memset(buf, 0, buflen - (buf - buf_start)); | |
2974 | ||
2975 | return buflen; | |
1da177e4 LT |
2976 | } |
2977 | ||
d0107eb0 | 2978 | /** |
92eac168 MR |
2979 | * vwrite() - write vmalloc area in a safe way. |
2980 | * @buf: buffer for source data | |
2981 | * @addr: vm address. | |
2982 | * @count: number of bytes to be read. | |
2983 | * | |
92eac168 MR |
2984 | * This function checks that addr is a valid vmalloc'ed area, and |
2985 | * copy data from a buffer to the given addr. If specified range of | |
2986 | * [addr...addr+count) includes some valid address, data is copied from | |
2987 | * proper area of @buf. If there are memory holes, no copy to hole. | |
2988 | * IOREMAP area is treated as memory hole and no copy is done. | |
2989 | * | |
2990 | * If [addr...addr+count) doesn't includes any intersects with alive | |
2991 | * vm_struct area, returns 0. @buf should be kernel's buffer. | |
2992 | * | |
2993 | * Note: In usual ops, vwrite() is never necessary because the caller | |
2994 | * should know vmalloc() area is valid and can use memcpy(). | |
2995 | * This is for routines which have to access vmalloc area without | |
d9009d67 | 2996 | * any information, as /dev/kmem. |
a862f68a MR |
2997 | * |
2998 | * Return: number of bytes for which addr and buf should be | |
2999 | * increased (same number as @count) or %0 if [addr...addr+count) | |
3000 | * doesn't include any intersection with valid vmalloc area | |
d0107eb0 | 3001 | */ |
1da177e4 LT |
3002 | long vwrite(char *buf, char *addr, unsigned long count) |
3003 | { | |
e81ce85f JK |
3004 | struct vmap_area *va; |
3005 | struct vm_struct *vm; | |
d0107eb0 KH |
3006 | char *vaddr; |
3007 | unsigned long n, buflen; | |
3008 | int copied = 0; | |
1da177e4 LT |
3009 | |
3010 | /* Don't allow overflow */ | |
3011 | if ((unsigned long) addr + count < count) | |
3012 | count = -(unsigned long) addr; | |
d0107eb0 | 3013 | buflen = count; |
1da177e4 | 3014 | |
e81ce85f JK |
3015 | spin_lock(&vmap_area_lock); |
3016 | list_for_each_entry(va, &vmap_area_list, list) { | |
3017 | if (!count) | |
3018 | break; | |
3019 | ||
688fcbfc | 3020 | if (!va->vm) |
e81ce85f JK |
3021 | continue; |
3022 | ||
3023 | vm = va->vm; | |
3024 | vaddr = (char *) vm->addr; | |
762216ab | 3025 | if (addr >= vaddr + get_vm_area_size(vm)) |
1da177e4 LT |
3026 | continue; |
3027 | while (addr < vaddr) { | |
3028 | if (count == 0) | |
3029 | goto finished; | |
3030 | buf++; | |
3031 | addr++; | |
3032 | count--; | |
3033 | } | |
762216ab | 3034 | n = vaddr + get_vm_area_size(vm) - addr; |
d0107eb0 KH |
3035 | if (n > count) |
3036 | n = count; | |
e81ce85f | 3037 | if (!(vm->flags & VM_IOREMAP)) { |
d0107eb0 KH |
3038 | aligned_vwrite(buf, addr, n); |
3039 | copied++; | |
3040 | } | |
3041 | buf += n; | |
3042 | addr += n; | |
3043 | count -= n; | |
1da177e4 LT |
3044 | } |
3045 | finished: | |
e81ce85f | 3046 | spin_unlock(&vmap_area_lock); |
d0107eb0 KH |
3047 | if (!copied) |
3048 | return 0; | |
3049 | return buflen; | |
1da177e4 | 3050 | } |
83342314 NP |
3051 | |
3052 | /** | |
92eac168 MR |
3053 | * remap_vmalloc_range_partial - map vmalloc pages to userspace |
3054 | * @vma: vma to cover | |
3055 | * @uaddr: target user address to start at | |
3056 | * @kaddr: virtual address of vmalloc kernel memory | |
3057 | * @size: size of map area | |
7682486b | 3058 | * |
92eac168 | 3059 | * Returns: 0 for success, -Exxx on failure |
83342314 | 3060 | * |
92eac168 MR |
3061 | * This function checks that @kaddr is a valid vmalloc'ed area, |
3062 | * and that it is big enough to cover the range starting at | |
3063 | * @uaddr in @vma. Will return failure if that criteria isn't | |
3064 | * met. | |
83342314 | 3065 | * |
92eac168 | 3066 | * Similar to remap_pfn_range() (see mm/memory.c) |
83342314 | 3067 | */ |
e69e9d4a HD |
3068 | int remap_vmalloc_range_partial(struct vm_area_struct *vma, unsigned long uaddr, |
3069 | void *kaddr, unsigned long size) | |
83342314 NP |
3070 | { |
3071 | struct vm_struct *area; | |
83342314 | 3072 | |
e69e9d4a HD |
3073 | size = PAGE_ALIGN(size); |
3074 | ||
3075 | if (!PAGE_ALIGNED(uaddr) || !PAGE_ALIGNED(kaddr)) | |
83342314 NP |
3076 | return -EINVAL; |
3077 | ||
e69e9d4a | 3078 | area = find_vm_area(kaddr); |
83342314 | 3079 | if (!area) |
db64fe02 | 3080 | return -EINVAL; |
83342314 | 3081 | |
fe9041c2 | 3082 | if (!(area->flags & (VM_USERMAP | VM_DMA_COHERENT))) |
db64fe02 | 3083 | return -EINVAL; |
83342314 | 3084 | |
401592d2 | 3085 | if (kaddr + size > area->addr + get_vm_area_size(area)) |
db64fe02 | 3086 | return -EINVAL; |
83342314 | 3087 | |
83342314 | 3088 | do { |
e69e9d4a | 3089 | struct page *page = vmalloc_to_page(kaddr); |
db64fe02 NP |
3090 | int ret; |
3091 | ||
83342314 NP |
3092 | ret = vm_insert_page(vma, uaddr, page); |
3093 | if (ret) | |
3094 | return ret; | |
3095 | ||
3096 | uaddr += PAGE_SIZE; | |
e69e9d4a HD |
3097 | kaddr += PAGE_SIZE; |
3098 | size -= PAGE_SIZE; | |
3099 | } while (size > 0); | |
83342314 | 3100 | |
314e51b9 | 3101 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
83342314 | 3102 | |
db64fe02 | 3103 | return 0; |
83342314 | 3104 | } |
e69e9d4a HD |
3105 | EXPORT_SYMBOL(remap_vmalloc_range_partial); |
3106 | ||
3107 | /** | |
92eac168 MR |
3108 | * remap_vmalloc_range - map vmalloc pages to userspace |
3109 | * @vma: vma to cover (map full range of vma) | |
3110 | * @addr: vmalloc memory | |
3111 | * @pgoff: number of pages into addr before first page to map | |
e69e9d4a | 3112 | * |
92eac168 | 3113 | * Returns: 0 for success, -Exxx on failure |
e69e9d4a | 3114 | * |
92eac168 MR |
3115 | * This function checks that addr is a valid vmalloc'ed area, and |
3116 | * that it is big enough to cover the vma. Will return failure if | |
3117 | * that criteria isn't met. | |
e69e9d4a | 3118 | * |
92eac168 | 3119 | * Similar to remap_pfn_range() (see mm/memory.c) |
e69e9d4a HD |
3120 | */ |
3121 | int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, | |
3122 | unsigned long pgoff) | |
3123 | { | |
3124 | return remap_vmalloc_range_partial(vma, vma->vm_start, | |
3125 | addr + (pgoff << PAGE_SHIFT), | |
3126 | vma->vm_end - vma->vm_start); | |
3127 | } | |
83342314 NP |
3128 | EXPORT_SYMBOL(remap_vmalloc_range); |
3129 | ||
1eeb66a1 | 3130 | /* |
763802b5 JR |
3131 | * Implement stubs for vmalloc_sync_[un]mappings () if the architecture chose |
3132 | * not to have one. | |
3f8fd02b JR |
3133 | * |
3134 | * The purpose of this function is to make sure the vmalloc area | |
3135 | * mappings are identical in all page-tables in the system. | |
1eeb66a1 | 3136 | */ |
763802b5 | 3137 | void __weak vmalloc_sync_mappings(void) |
1eeb66a1 CH |
3138 | { |
3139 | } | |
5f4352fb | 3140 | |
763802b5 JR |
3141 | void __weak vmalloc_sync_unmappings(void) |
3142 | { | |
3143 | } | |
5f4352fb | 3144 | |
8b1e0f81 | 3145 | static int f(pte_t *pte, unsigned long addr, void *data) |
5f4352fb | 3146 | { |
cd12909c DV |
3147 | pte_t ***p = data; |
3148 | ||
3149 | if (p) { | |
3150 | *(*p) = pte; | |
3151 | (*p)++; | |
3152 | } | |
5f4352fb JF |
3153 | return 0; |
3154 | } | |
3155 | ||
3156 | /** | |
92eac168 MR |
3157 | * alloc_vm_area - allocate a range of kernel address space |
3158 | * @size: size of the area | |
3159 | * @ptes: returns the PTEs for the address space | |
7682486b | 3160 | * |
92eac168 | 3161 | * Returns: NULL on failure, vm_struct on success |
5f4352fb | 3162 | * |
92eac168 MR |
3163 | * This function reserves a range of kernel address space, and |
3164 | * allocates pagetables to map that range. No actual mappings | |
3165 | * are created. | |
cd12909c | 3166 | * |
92eac168 MR |
3167 | * If @ptes is non-NULL, pointers to the PTEs (in init_mm) |
3168 | * allocated for the VM area are returned. | |
5f4352fb | 3169 | */ |
cd12909c | 3170 | struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes) |
5f4352fb JF |
3171 | { |
3172 | struct vm_struct *area; | |
3173 | ||
23016969 CL |
3174 | area = get_vm_area_caller(size, VM_IOREMAP, |
3175 | __builtin_return_address(0)); | |
5f4352fb JF |
3176 | if (area == NULL) |
3177 | return NULL; | |
3178 | ||
3179 | /* | |
3180 | * This ensures that page tables are constructed for this region | |
3181 | * of kernel virtual address space and mapped into init_mm. | |
3182 | */ | |
3183 | if (apply_to_page_range(&init_mm, (unsigned long)area->addr, | |
cd12909c | 3184 | size, f, ptes ? &ptes : NULL)) { |
5f4352fb JF |
3185 | free_vm_area(area); |
3186 | return NULL; | |
3187 | } | |
3188 | ||
5f4352fb JF |
3189 | return area; |
3190 | } | |
3191 | EXPORT_SYMBOL_GPL(alloc_vm_area); | |
3192 | ||
3193 | void free_vm_area(struct vm_struct *area) | |
3194 | { | |
3195 | struct vm_struct *ret; | |
3196 | ret = remove_vm_area(area->addr); | |
3197 | BUG_ON(ret != area); | |
3198 | kfree(area); | |
3199 | } | |
3200 | EXPORT_SYMBOL_GPL(free_vm_area); | |
a10aa579 | 3201 | |
4f8b02b4 | 3202 | #ifdef CONFIG_SMP |
ca23e405 TH |
3203 | static struct vmap_area *node_to_va(struct rb_node *n) |
3204 | { | |
4583e773 | 3205 | return rb_entry_safe(n, struct vmap_area, rb_node); |
ca23e405 TH |
3206 | } |
3207 | ||
3208 | /** | |
68ad4a33 URS |
3209 | * pvm_find_va_enclose_addr - find the vmap_area @addr belongs to |
3210 | * @addr: target address | |
ca23e405 | 3211 | * |
68ad4a33 URS |
3212 | * Returns: vmap_area if it is found. If there is no such area |
3213 | * the first highest(reverse order) vmap_area is returned | |
3214 | * i.e. va->va_start < addr && va->va_end < addr or NULL | |
3215 | * if there are no any areas before @addr. | |
ca23e405 | 3216 | */ |
68ad4a33 URS |
3217 | static struct vmap_area * |
3218 | pvm_find_va_enclose_addr(unsigned long addr) | |
ca23e405 | 3219 | { |
68ad4a33 URS |
3220 | struct vmap_area *va, *tmp; |
3221 | struct rb_node *n; | |
3222 | ||
3223 | n = free_vmap_area_root.rb_node; | |
3224 | va = NULL; | |
ca23e405 TH |
3225 | |
3226 | while (n) { | |
68ad4a33 URS |
3227 | tmp = rb_entry(n, struct vmap_area, rb_node); |
3228 | if (tmp->va_start <= addr) { | |
3229 | va = tmp; | |
3230 | if (tmp->va_end >= addr) | |
3231 | break; | |
3232 | ||
ca23e405 | 3233 | n = n->rb_right; |
68ad4a33 URS |
3234 | } else { |
3235 | n = n->rb_left; | |
3236 | } | |
ca23e405 TH |
3237 | } |
3238 | ||
68ad4a33 | 3239 | return va; |
ca23e405 TH |
3240 | } |
3241 | ||
3242 | /** | |
68ad4a33 URS |
3243 | * pvm_determine_end_from_reverse - find the highest aligned address |
3244 | * of free block below VMALLOC_END | |
3245 | * @va: | |
3246 | * in - the VA we start the search(reverse order); | |
3247 | * out - the VA with the highest aligned end address. | |
ca23e405 | 3248 | * |
68ad4a33 | 3249 | * Returns: determined end address within vmap_area |
ca23e405 | 3250 | */ |
68ad4a33 URS |
3251 | static unsigned long |
3252 | pvm_determine_end_from_reverse(struct vmap_area **va, unsigned long align) | |
ca23e405 | 3253 | { |
68ad4a33 | 3254 | unsigned long vmalloc_end = VMALLOC_END & ~(align - 1); |
ca23e405 TH |
3255 | unsigned long addr; |
3256 | ||
68ad4a33 URS |
3257 | if (likely(*va)) { |
3258 | list_for_each_entry_from_reverse((*va), | |
3259 | &free_vmap_area_list, list) { | |
3260 | addr = min((*va)->va_end & ~(align - 1), vmalloc_end); | |
3261 | if ((*va)->va_start < addr) | |
3262 | return addr; | |
3263 | } | |
ca23e405 TH |
3264 | } |
3265 | ||
68ad4a33 | 3266 | return 0; |
ca23e405 TH |
3267 | } |
3268 | ||
3269 | /** | |
3270 | * pcpu_get_vm_areas - allocate vmalloc areas for percpu allocator | |
3271 | * @offsets: array containing offset of each area | |
3272 | * @sizes: array containing size of each area | |
3273 | * @nr_vms: the number of areas to allocate | |
3274 | * @align: alignment, all entries in @offsets and @sizes must be aligned to this | |
ca23e405 TH |
3275 | * |
3276 | * Returns: kmalloc'd vm_struct pointer array pointing to allocated | |
3277 | * vm_structs on success, %NULL on failure | |
3278 | * | |
3279 | * Percpu allocator wants to use congruent vm areas so that it can | |
3280 | * maintain the offsets among percpu areas. This function allocates | |
ec3f64fc DR |
3281 | * congruent vmalloc areas for it with GFP_KERNEL. These areas tend to |
3282 | * be scattered pretty far, distance between two areas easily going up | |
3283 | * to gigabytes. To avoid interacting with regular vmallocs, these | |
3284 | * areas are allocated from top. | |
ca23e405 | 3285 | * |
68ad4a33 URS |
3286 | * Despite its complicated look, this allocator is rather simple. It |
3287 | * does everything top-down and scans free blocks from the end looking | |
3288 | * for matching base. While scanning, if any of the areas do not fit the | |
3289 | * base address is pulled down to fit the area. Scanning is repeated till | |
3290 | * all the areas fit and then all necessary data structures are inserted | |
3291 | * and the result is returned. | |
ca23e405 TH |
3292 | */ |
3293 | struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, | |
3294 | const size_t *sizes, int nr_vms, | |
ec3f64fc | 3295 | size_t align) |
ca23e405 TH |
3296 | { |
3297 | const unsigned long vmalloc_start = ALIGN(VMALLOC_START, align); | |
3298 | const unsigned long vmalloc_end = VMALLOC_END & ~(align - 1); | |
68ad4a33 | 3299 | struct vmap_area **vas, *va; |
ca23e405 TH |
3300 | struct vm_struct **vms; |
3301 | int area, area2, last_area, term_area; | |
253a496d | 3302 | unsigned long base, start, size, end, last_end, orig_start, orig_end; |
ca23e405 | 3303 | bool purged = false; |
68ad4a33 | 3304 | enum fit_type type; |
ca23e405 | 3305 | |
ca23e405 | 3306 | /* verify parameters and allocate data structures */ |
891c49ab | 3307 | BUG_ON(offset_in_page(align) || !is_power_of_2(align)); |
ca23e405 TH |
3308 | for (last_area = 0, area = 0; area < nr_vms; area++) { |
3309 | start = offsets[area]; | |
3310 | end = start + sizes[area]; | |
3311 | ||
3312 | /* is everything aligned properly? */ | |
3313 | BUG_ON(!IS_ALIGNED(offsets[area], align)); | |
3314 | BUG_ON(!IS_ALIGNED(sizes[area], align)); | |
3315 | ||
3316 | /* detect the area with the highest address */ | |
3317 | if (start > offsets[last_area]) | |
3318 | last_area = area; | |
3319 | ||
c568da28 | 3320 | for (area2 = area + 1; area2 < nr_vms; area2++) { |
ca23e405 TH |
3321 | unsigned long start2 = offsets[area2]; |
3322 | unsigned long end2 = start2 + sizes[area2]; | |
3323 | ||
c568da28 | 3324 | BUG_ON(start2 < end && start < end2); |
ca23e405 TH |
3325 | } |
3326 | } | |
3327 | last_end = offsets[last_area] + sizes[last_area]; | |
3328 | ||
3329 | if (vmalloc_end - vmalloc_start < last_end) { | |
3330 | WARN_ON(true); | |
3331 | return NULL; | |
3332 | } | |
3333 | ||
4d67d860 TM |
3334 | vms = kcalloc(nr_vms, sizeof(vms[0]), GFP_KERNEL); |
3335 | vas = kcalloc(nr_vms, sizeof(vas[0]), GFP_KERNEL); | |
ca23e405 | 3336 | if (!vas || !vms) |
f1db7afd | 3337 | goto err_free2; |
ca23e405 TH |
3338 | |
3339 | for (area = 0; area < nr_vms; area++) { | |
68ad4a33 | 3340 | vas[area] = kmem_cache_zalloc(vmap_area_cachep, GFP_KERNEL); |
ec3f64fc | 3341 | vms[area] = kzalloc(sizeof(struct vm_struct), GFP_KERNEL); |
ca23e405 TH |
3342 | if (!vas[area] || !vms[area]) |
3343 | goto err_free; | |
3344 | } | |
3345 | retry: | |
e36176be | 3346 | spin_lock(&free_vmap_area_lock); |
ca23e405 TH |
3347 | |
3348 | /* start scanning - we scan from the top, begin with the last area */ | |
3349 | area = term_area = last_area; | |
3350 | start = offsets[area]; | |
3351 | end = start + sizes[area]; | |
3352 | ||
68ad4a33 URS |
3353 | va = pvm_find_va_enclose_addr(vmalloc_end); |
3354 | base = pvm_determine_end_from_reverse(&va, align) - end; | |
ca23e405 TH |
3355 | |
3356 | while (true) { | |
ca23e405 TH |
3357 | /* |
3358 | * base might have underflowed, add last_end before | |
3359 | * comparing. | |
3360 | */ | |
68ad4a33 URS |
3361 | if (base + last_end < vmalloc_start + last_end) |
3362 | goto overflow; | |
ca23e405 TH |
3363 | |
3364 | /* | |
68ad4a33 | 3365 | * Fitting base has not been found. |
ca23e405 | 3366 | */ |
68ad4a33 URS |
3367 | if (va == NULL) |
3368 | goto overflow; | |
ca23e405 | 3369 | |
5336e52c KS |
3370 | /* |
3371 | * If required width exeeds current VA block, move | |
3372 | * base downwards and then recheck. | |
3373 | */ | |
3374 | if (base + end > va->va_end) { | |
3375 | base = pvm_determine_end_from_reverse(&va, align) - end; | |
3376 | term_area = area; | |
3377 | continue; | |
3378 | } | |
3379 | ||
ca23e405 | 3380 | /* |
68ad4a33 | 3381 | * If this VA does not fit, move base downwards and recheck. |
ca23e405 | 3382 | */ |
5336e52c | 3383 | if (base + start < va->va_start) { |
68ad4a33 URS |
3384 | va = node_to_va(rb_prev(&va->rb_node)); |
3385 | base = pvm_determine_end_from_reverse(&va, align) - end; | |
ca23e405 TH |
3386 | term_area = area; |
3387 | continue; | |
3388 | } | |
3389 | ||
3390 | /* | |
3391 | * This area fits, move on to the previous one. If | |
3392 | * the previous one is the terminal one, we're done. | |
3393 | */ | |
3394 | area = (area + nr_vms - 1) % nr_vms; | |
3395 | if (area == term_area) | |
3396 | break; | |
68ad4a33 | 3397 | |
ca23e405 TH |
3398 | start = offsets[area]; |
3399 | end = start + sizes[area]; | |
68ad4a33 | 3400 | va = pvm_find_va_enclose_addr(base + end); |
ca23e405 | 3401 | } |
68ad4a33 | 3402 | |
ca23e405 TH |
3403 | /* we've found a fitting base, insert all va's */ |
3404 | for (area = 0; area < nr_vms; area++) { | |
68ad4a33 | 3405 | int ret; |
ca23e405 | 3406 | |
68ad4a33 URS |
3407 | start = base + offsets[area]; |
3408 | size = sizes[area]; | |
ca23e405 | 3409 | |
68ad4a33 URS |
3410 | va = pvm_find_va_enclose_addr(start); |
3411 | if (WARN_ON_ONCE(va == NULL)) | |
3412 | /* It is a BUG(), but trigger recovery instead. */ | |
3413 | goto recovery; | |
3414 | ||
3415 | type = classify_va_fit_type(va, start, size); | |
3416 | if (WARN_ON_ONCE(type == NOTHING_FIT)) | |
3417 | /* It is a BUG(), but trigger recovery instead. */ | |
3418 | goto recovery; | |
3419 | ||
3420 | ret = adjust_va_to_fit_type(va, start, size, type); | |
3421 | if (unlikely(ret)) | |
3422 | goto recovery; | |
3423 | ||
3424 | /* Allocated area. */ | |
3425 | va = vas[area]; | |
3426 | va->va_start = start; | |
3427 | va->va_end = start + size; | |
68ad4a33 | 3428 | } |
ca23e405 | 3429 | |
e36176be | 3430 | spin_unlock(&free_vmap_area_lock); |
ca23e405 | 3431 | |
253a496d DA |
3432 | /* populate the kasan shadow space */ |
3433 | for (area = 0; area < nr_vms; area++) { | |
3434 | if (kasan_populate_vmalloc(vas[area]->va_start, sizes[area])) | |
3435 | goto err_free_shadow; | |
3436 | ||
3437 | kasan_unpoison_vmalloc((void *)vas[area]->va_start, | |
3438 | sizes[area]); | |
3439 | } | |
3440 | ||
ca23e405 | 3441 | /* insert all vm's */ |
e36176be URS |
3442 | spin_lock(&vmap_area_lock); |
3443 | for (area = 0; area < nr_vms; area++) { | |
3444 | insert_vmap_area(vas[area], &vmap_area_root, &vmap_area_list); | |
3445 | ||
3446 | setup_vmalloc_vm_locked(vms[area], vas[area], VM_ALLOC, | |
3645cb4a | 3447 | pcpu_get_vm_areas); |
e36176be URS |
3448 | } |
3449 | spin_unlock(&vmap_area_lock); | |
ca23e405 TH |
3450 | |
3451 | kfree(vas); | |
3452 | return vms; | |
3453 | ||
68ad4a33 | 3454 | recovery: |
e36176be URS |
3455 | /* |
3456 | * Remove previously allocated areas. There is no | |
3457 | * need in removing these areas from the busy tree, | |
3458 | * because they are inserted only on the final step | |
3459 | * and when pcpu_get_vm_areas() is success. | |
3460 | */ | |
68ad4a33 | 3461 | while (area--) { |
253a496d DA |
3462 | orig_start = vas[area]->va_start; |
3463 | orig_end = vas[area]->va_end; | |
3464 | va = merge_or_add_vmap_area(vas[area], &free_vmap_area_root, | |
3465 | &free_vmap_area_list); | |
3466 | kasan_release_vmalloc(orig_start, orig_end, | |
3467 | va->va_start, va->va_end); | |
68ad4a33 URS |
3468 | vas[area] = NULL; |
3469 | } | |
3470 | ||
3471 | overflow: | |
e36176be | 3472 | spin_unlock(&free_vmap_area_lock); |
68ad4a33 URS |
3473 | if (!purged) { |
3474 | purge_vmap_area_lazy(); | |
3475 | purged = true; | |
3476 | ||
3477 | /* Before "retry", check if we recover. */ | |
3478 | for (area = 0; area < nr_vms; area++) { | |
3479 | if (vas[area]) | |
3480 | continue; | |
3481 | ||
3482 | vas[area] = kmem_cache_zalloc( | |
3483 | vmap_area_cachep, GFP_KERNEL); | |
3484 | if (!vas[area]) | |
3485 | goto err_free; | |
3486 | } | |
3487 | ||
3488 | goto retry; | |
3489 | } | |
3490 | ||
ca23e405 TH |
3491 | err_free: |
3492 | for (area = 0; area < nr_vms; area++) { | |
68ad4a33 URS |
3493 | if (vas[area]) |
3494 | kmem_cache_free(vmap_area_cachep, vas[area]); | |
3495 | ||
f1db7afd | 3496 | kfree(vms[area]); |
ca23e405 | 3497 | } |
f1db7afd | 3498 | err_free2: |
ca23e405 TH |
3499 | kfree(vas); |
3500 | kfree(vms); | |
3501 | return NULL; | |
253a496d DA |
3502 | |
3503 | err_free_shadow: | |
3504 | spin_lock(&free_vmap_area_lock); | |
3505 | /* | |
3506 | * We release all the vmalloc shadows, even the ones for regions that | |
3507 | * hadn't been successfully added. This relies on kasan_release_vmalloc | |
3508 | * being able to tolerate this case. | |
3509 | */ | |
3510 | for (area = 0; area < nr_vms; area++) { | |
3511 | orig_start = vas[area]->va_start; | |
3512 | orig_end = vas[area]->va_end; | |
3513 | va = merge_or_add_vmap_area(vas[area], &free_vmap_area_root, | |
3514 | &free_vmap_area_list); | |
3515 | kasan_release_vmalloc(orig_start, orig_end, | |
3516 | va->va_start, va->va_end); | |
3517 | vas[area] = NULL; | |
3518 | kfree(vms[area]); | |
3519 | } | |
3520 | spin_unlock(&free_vmap_area_lock); | |
3521 | kfree(vas); | |
3522 | kfree(vms); | |
3523 | return NULL; | |
ca23e405 TH |
3524 | } |
3525 | ||
3526 | /** | |
3527 | * pcpu_free_vm_areas - free vmalloc areas for percpu allocator | |
3528 | * @vms: vm_struct pointer array returned by pcpu_get_vm_areas() | |
3529 | * @nr_vms: the number of allocated areas | |
3530 | * | |
3531 | * Free vm_structs and the array allocated by pcpu_get_vm_areas(). | |
3532 | */ | |
3533 | void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) | |
3534 | { | |
3535 | int i; | |
3536 | ||
3537 | for (i = 0; i < nr_vms; i++) | |
3538 | free_vm_area(vms[i]); | |
3539 | kfree(vms); | |
3540 | } | |
4f8b02b4 | 3541 | #endif /* CONFIG_SMP */ |
a10aa579 CL |
3542 | |
3543 | #ifdef CONFIG_PROC_FS | |
3544 | static void *s_start(struct seq_file *m, loff_t *pos) | |
e36176be | 3545 | __acquires(&vmap_purge_lock) |
d4033afd | 3546 | __acquires(&vmap_area_lock) |
a10aa579 | 3547 | { |
e36176be | 3548 | mutex_lock(&vmap_purge_lock); |
d4033afd | 3549 | spin_lock(&vmap_area_lock); |
e36176be | 3550 | |
3f500069 | 3551 | return seq_list_start(&vmap_area_list, *pos); |
a10aa579 CL |
3552 | } |
3553 | ||
3554 | static void *s_next(struct seq_file *m, void *p, loff_t *pos) | |
3555 | { | |
3f500069 | 3556 | return seq_list_next(p, &vmap_area_list, pos); |
a10aa579 CL |
3557 | } |
3558 | ||
3559 | static void s_stop(struct seq_file *m, void *p) | |
e36176be | 3560 | __releases(&vmap_purge_lock) |
d4033afd | 3561 | __releases(&vmap_area_lock) |
a10aa579 | 3562 | { |
e36176be | 3563 | mutex_unlock(&vmap_purge_lock); |
d4033afd | 3564 | spin_unlock(&vmap_area_lock); |
a10aa579 CL |
3565 | } |
3566 | ||
a47a126a ED |
3567 | static void show_numa_info(struct seq_file *m, struct vm_struct *v) |
3568 | { | |
e5adfffc | 3569 | if (IS_ENABLED(CONFIG_NUMA)) { |
a47a126a ED |
3570 | unsigned int nr, *counters = m->private; |
3571 | ||
3572 | if (!counters) | |
3573 | return; | |
3574 | ||
af12346c WL |
3575 | if (v->flags & VM_UNINITIALIZED) |
3576 | return; | |
7e5b528b DV |
3577 | /* Pair with smp_wmb() in clear_vm_uninitialized_flag() */ |
3578 | smp_rmb(); | |
af12346c | 3579 | |
a47a126a ED |
3580 | memset(counters, 0, nr_node_ids * sizeof(unsigned int)); |
3581 | ||
3582 | for (nr = 0; nr < v->nr_pages; nr++) | |
3583 | counters[page_to_nid(v->pages[nr])]++; | |
3584 | ||
3585 | for_each_node_state(nr, N_HIGH_MEMORY) | |
3586 | if (counters[nr]) | |
3587 | seq_printf(m, " N%u=%u", nr, counters[nr]); | |
3588 | } | |
3589 | } | |
3590 | ||
dd3b8353 URS |
3591 | static void show_purge_info(struct seq_file *m) |
3592 | { | |
3593 | struct llist_node *head; | |
3594 | struct vmap_area *va; | |
3595 | ||
3596 | head = READ_ONCE(vmap_purge_list.first); | |
3597 | if (head == NULL) | |
3598 | return; | |
3599 | ||
3600 | llist_for_each_entry(va, head, purge_list) { | |
3601 | seq_printf(m, "0x%pK-0x%pK %7ld unpurged vm_area\n", | |
3602 | (void *)va->va_start, (void *)va->va_end, | |
3603 | va->va_end - va->va_start); | |
3604 | } | |
3605 | } | |
3606 | ||
a10aa579 CL |
3607 | static int s_show(struct seq_file *m, void *p) |
3608 | { | |
3f500069 | 3609 | struct vmap_area *va; |
d4033afd JK |
3610 | struct vm_struct *v; |
3611 | ||
3f500069 | 3612 | va = list_entry(p, struct vmap_area, list); |
3613 | ||
c2ce8c14 | 3614 | /* |
688fcbfc PL |
3615 | * s_show can encounter race with remove_vm_area, !vm on behalf |
3616 | * of vmap area is being tear down or vm_map_ram allocation. | |
c2ce8c14 | 3617 | */ |
688fcbfc | 3618 | if (!va->vm) { |
dd3b8353 | 3619 | seq_printf(m, "0x%pK-0x%pK %7ld vm_map_ram\n", |
78c72746 | 3620 | (void *)va->va_start, (void *)va->va_end, |
dd3b8353 | 3621 | va->va_end - va->va_start); |
78c72746 | 3622 | |
d4033afd | 3623 | return 0; |
78c72746 | 3624 | } |
d4033afd JK |
3625 | |
3626 | v = va->vm; | |
a10aa579 | 3627 | |
45ec1690 | 3628 | seq_printf(m, "0x%pK-0x%pK %7ld", |
a10aa579 CL |
3629 | v->addr, v->addr + v->size, v->size); |
3630 | ||
62c70bce JP |
3631 | if (v->caller) |
3632 | seq_printf(m, " %pS", v->caller); | |
23016969 | 3633 | |
a10aa579 CL |
3634 | if (v->nr_pages) |
3635 | seq_printf(m, " pages=%d", v->nr_pages); | |
3636 | ||
3637 | if (v->phys_addr) | |
199eaa05 | 3638 | seq_printf(m, " phys=%pa", &v->phys_addr); |
a10aa579 CL |
3639 | |
3640 | if (v->flags & VM_IOREMAP) | |
f4527c90 | 3641 | seq_puts(m, " ioremap"); |
a10aa579 CL |
3642 | |
3643 | if (v->flags & VM_ALLOC) | |
f4527c90 | 3644 | seq_puts(m, " vmalloc"); |
a10aa579 CL |
3645 | |
3646 | if (v->flags & VM_MAP) | |
f4527c90 | 3647 | seq_puts(m, " vmap"); |
a10aa579 CL |
3648 | |
3649 | if (v->flags & VM_USERMAP) | |
f4527c90 | 3650 | seq_puts(m, " user"); |
a10aa579 | 3651 | |
fe9041c2 CH |
3652 | if (v->flags & VM_DMA_COHERENT) |
3653 | seq_puts(m, " dma-coherent"); | |
3654 | ||
244d63ee | 3655 | if (is_vmalloc_addr(v->pages)) |
f4527c90 | 3656 | seq_puts(m, " vpages"); |
a10aa579 | 3657 | |
a47a126a | 3658 | show_numa_info(m, v); |
a10aa579 | 3659 | seq_putc(m, '\n'); |
dd3b8353 URS |
3660 | |
3661 | /* | |
3662 | * As a final step, dump "unpurged" areas. Note, | |
3663 | * that entire "/proc/vmallocinfo" output will not | |
3664 | * be address sorted, because the purge list is not | |
3665 | * sorted. | |
3666 | */ | |
3667 | if (list_is_last(&va->list, &vmap_area_list)) | |
3668 | show_purge_info(m); | |
3669 | ||
a10aa579 CL |
3670 | return 0; |
3671 | } | |
3672 | ||
5f6a6a9c | 3673 | static const struct seq_operations vmalloc_op = { |
a10aa579 CL |
3674 | .start = s_start, |
3675 | .next = s_next, | |
3676 | .stop = s_stop, | |
3677 | .show = s_show, | |
3678 | }; | |
5f6a6a9c | 3679 | |
5f6a6a9c AD |
3680 | static int __init proc_vmalloc_init(void) |
3681 | { | |
fddda2b7 | 3682 | if (IS_ENABLED(CONFIG_NUMA)) |
0825a6f9 | 3683 | proc_create_seq_private("vmallocinfo", 0400, NULL, |
44414d82 CH |
3684 | &vmalloc_op, |
3685 | nr_node_ids * sizeof(unsigned int), NULL); | |
fddda2b7 | 3686 | else |
0825a6f9 | 3687 | proc_create_seq("vmallocinfo", 0400, NULL, &vmalloc_op); |
5f6a6a9c AD |
3688 | return 0; |
3689 | } | |
3690 | module_init(proc_vmalloc_init); | |
db3808c1 | 3691 | |
a10aa579 | 3692 | #endif |