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Commit | Line | Data |
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09325873 YL |
1 | /* |
2 | * bootmem - A boot-time physical memory allocator and configurator | |
3 | * | |
4 | * Copyright (C) 1999 Ingo Molnar | |
5 | * 1999 Kanoj Sarcar, SGI | |
6 | * 2008 Johannes Weiner | |
7 | * | |
8 | * Access to this subsystem has to be serialized externally (which is true | |
9 | * for the boot process anyway). | |
10 | */ | |
11 | #include <linux/init.h> | |
12 | #include <linux/pfn.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/bootmem.h> | |
b95f1b31 | 15 | #include <linux/export.h> |
09325873 YL |
16 | #include <linux/kmemleak.h> |
17 | #include <linux/range.h> | |
18 | #include <linux/memblock.h> | |
19 | ||
20 | #include <asm/bug.h> | |
21 | #include <asm/io.h> | |
22 | #include <asm/processor.h> | |
23 | ||
24 | #include "internal.h" | |
25 | ||
e782ab42 YL |
26 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
27 | struct pglist_data __refdata contig_page_data; | |
28 | EXPORT_SYMBOL(contig_page_data); | |
29 | #endif | |
30 | ||
09325873 YL |
31 | unsigned long max_low_pfn; |
32 | unsigned long min_low_pfn; | |
33 | unsigned long max_pfn; | |
34 | ||
8bc1f91e YL |
35 | static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align, |
36 | u64 goal, u64 limit) | |
37 | { | |
38 | void *ptr; | |
39 | u64 addr; | |
40 | ||
41 | if (limit > memblock.current_limit) | |
42 | limit = memblock.current_limit; | |
43 | ||
fc6daaf9 TL |
44 | addr = memblock_find_in_range_node(size, align, goal, limit, nid, |
45 | MEMBLOCK_NONE); | |
1f5026a7 | 46 | if (!addr) |
8bc1f91e YL |
47 | return NULL; |
48 | ||
87379ec8 PH |
49 | if (memblock_reserve(addr, size)) |
50 | return NULL; | |
51 | ||
8bc1f91e YL |
52 | ptr = phys_to_virt(addr); |
53 | memset(ptr, 0, size); | |
8bc1f91e YL |
54 | /* |
55 | * The min_count is set to 0 so that bootmem allocated blocks | |
56 | * are never reported as leaks. | |
57 | */ | |
58 | kmemleak_alloc(ptr, size, 0, 0); | |
59 | return ptr; | |
60 | } | |
61 | ||
09325873 YL |
62 | /* |
63 | * free_bootmem_late - free bootmem pages directly to page allocator | |
64 | * @addr: starting address of the range | |
65 | * @size: size of the range in bytes | |
66 | * | |
67 | * This is only useful when the bootmem allocator has already been torn | |
68 | * down, but we are still initializing the system. Pages are given directly | |
69 | * to the page allocator, no bootmem metadata is updated because it is gone. | |
70 | */ | |
71 | void __init free_bootmem_late(unsigned long addr, unsigned long size) | |
72 | { | |
73 | unsigned long cursor, end; | |
74 | ||
75 | kmemleak_free_part(__va(addr), size); | |
76 | ||
77 | cursor = PFN_UP(addr); | |
78 | end = PFN_DOWN(addr + size); | |
79 | ||
80 | for (; cursor < end; cursor++) { | |
81 | __free_pages_bootmem(pfn_to_page(cursor), 0); | |
82 | totalram_pages++; | |
83 | } | |
84 | } | |
85 | ||
86 | static void __init __free_pages_memory(unsigned long start, unsigned long end) | |
87 | { | |
309d0b39 | 88 | int order; |
09325873 | 89 | |
309d0b39 RH |
90 | while (start < end) { |
91 | order = min(MAX_ORDER - 1UL, __ffs(start)); | |
09325873 | 92 | |
309d0b39 RH |
93 | while (start + (1UL << order) > end) |
94 | order--; | |
09325873 | 95 | |
309d0b39 | 96 | __free_pages_bootmem(pfn_to_page(start), order); |
09325873 | 97 | |
309d0b39 RH |
98 | start += (1UL << order); |
99 | } | |
09325873 YL |
100 | } |
101 | ||
29f67386 YL |
102 | static unsigned long __init __free_memory_core(phys_addr_t start, |
103 | phys_addr_t end) | |
104 | { | |
105 | unsigned long start_pfn = PFN_UP(start); | |
106 | unsigned long end_pfn = min_t(unsigned long, | |
107 | PFN_DOWN(end), max_low_pfn); | |
108 | ||
109 | if (start_pfn > end_pfn) | |
110 | return 0; | |
111 | ||
112 | __free_pages_memory(start_pfn, end_pfn); | |
113 | ||
114 | return end_pfn - start_pfn; | |
115 | } | |
116 | ||
b4def350 | 117 | static unsigned long __init free_low_memory_core_early(void) |
09325873 | 118 | { |
09325873 | 119 | unsigned long count = 0; |
354f17e1 | 120 | phys_addr_t start, end; |
8a9ca34c TH |
121 | u64 i; |
122 | ||
0a313a99 XQ |
123 | memblock_clear_hotplug(0, -1); |
124 | ||
fc6daaf9 TL |
125 | for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end, |
126 | NULL) | |
29f67386 YL |
127 | count += __free_memory_core(start, end); |
128 | ||
5e270e25 | 129 | #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK |
354f17e1 PH |
130 | { |
131 | phys_addr_t size; | |
132 | ||
133 | /* Free memblock.reserved array if it was allocated */ | |
134 | size = get_allocated_memblock_reserved_regions_info(&start); | |
135 | if (size) | |
136 | count += __free_memory_core(start, start + size); | |
137 | ||
138 | /* Free memblock.memory array if it was allocated */ | |
139 | size = get_allocated_memblock_memory_regions_info(&start); | |
140 | if (size) | |
141 | count += __free_memory_core(start, start + size); | |
142 | } | |
5e270e25 PH |
143 | #endif |
144 | ||
09325873 YL |
145 | return count; |
146 | } | |
147 | ||
7b4b2a0d JL |
148 | static int reset_managed_pages_done __initdata; |
149 | ||
f784a3f1 | 150 | void reset_node_managed_pages(pg_data_t *pgdat) |
9feedc9d JL |
151 | { |
152 | struct zone *z; | |
153 | ||
9feedc9d | 154 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) |
7b4b2a0d JL |
155 | z->managed_pages = 0; |
156 | } | |
157 | ||
158 | void __init reset_all_zones_managed_pages(void) | |
159 | { | |
160 | struct pglist_data *pgdat; | |
161 | ||
f784a3f1 TC |
162 | if (reset_managed_pages_done) |
163 | return; | |
164 | ||
7b4b2a0d JL |
165 | for_each_online_pgdat(pgdat) |
166 | reset_node_managed_pages(pgdat); | |
f784a3f1 | 167 | |
7b4b2a0d | 168 | reset_managed_pages_done = 1; |
9feedc9d JL |
169 | } |
170 | ||
09325873 YL |
171 | /** |
172 | * free_all_bootmem - release free pages to the buddy allocator | |
173 | * | |
174 | * Returns the number of pages actually released. | |
175 | */ | |
176 | unsigned long __init free_all_bootmem(void) | |
177 | { | |
0c988534 JL |
178 | unsigned long pages; |
179 | ||
7b4b2a0d | 180 | reset_all_zones_managed_pages(); |
9feedc9d | 181 | |
09325873 | 182 | /* |
b1154233 | 183 | * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id |
25985edc | 184 | * because in some case like Node0 doesn't have RAM installed |
09325873 | 185 | * low ram will be on Node1 |
09325873 | 186 | */ |
0c988534 JL |
187 | pages = free_low_memory_core_early(); |
188 | totalram_pages += pages; | |
189 | ||
190 | return pages; | |
09325873 YL |
191 | } |
192 | ||
193 | /** | |
194 | * free_bootmem_node - mark a page range as usable | |
195 | * @pgdat: node the range resides on | |
196 | * @physaddr: starting address of the range | |
197 | * @size: size of the range in bytes | |
198 | * | |
199 | * Partial pages will be considered reserved and left as they are. | |
200 | * | |
201 | * The range must reside completely on the specified node. | |
202 | */ | |
203 | void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, | |
204 | unsigned long size) | |
205 | { | |
24aa0788 | 206 | memblock_free(physaddr, size); |
09325873 YL |
207 | } |
208 | ||
209 | /** | |
210 | * free_bootmem - mark a page range as usable | |
211 | * @addr: starting address of the range | |
212 | * @size: size of the range in bytes | |
213 | * | |
214 | * Partial pages will be considered reserved and left as they are. | |
215 | * | |
216 | * The range must be contiguous but may span node boundaries. | |
217 | */ | |
218 | void __init free_bootmem(unsigned long addr, unsigned long size) | |
219 | { | |
24aa0788 | 220 | memblock_free(addr, size); |
09325873 YL |
221 | } |
222 | ||
223 | static void * __init ___alloc_bootmem_nopanic(unsigned long size, | |
224 | unsigned long align, | |
225 | unsigned long goal, | |
226 | unsigned long limit) | |
227 | { | |
228 | void *ptr; | |
229 | ||
230 | if (WARN_ON_ONCE(slab_is_available())) | |
231 | return kzalloc(size, GFP_NOWAIT); | |
232 | ||
233 | restart: | |
234 | ||
b1154233 | 235 | ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit); |
09325873 YL |
236 | |
237 | if (ptr) | |
238 | return ptr; | |
239 | ||
240 | if (goal != 0) { | |
241 | goal = 0; | |
242 | goto restart; | |
243 | } | |
244 | ||
245 | return NULL; | |
246 | } | |
247 | ||
248 | /** | |
249 | * __alloc_bootmem_nopanic - allocate boot memory without panicking | |
250 | * @size: size of the request in bytes | |
251 | * @align: alignment of the region | |
252 | * @goal: preferred starting address of the region | |
253 | * | |
254 | * The goal is dropped if it can not be satisfied and the allocation will | |
255 | * fall back to memory below @goal. | |
256 | * | |
257 | * Allocation may happen on any node in the system. | |
258 | * | |
259 | * Returns NULL on failure. | |
260 | */ | |
261 | void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, | |
262 | unsigned long goal) | |
263 | { | |
264 | unsigned long limit = -1UL; | |
265 | ||
266 | return ___alloc_bootmem_nopanic(size, align, goal, limit); | |
267 | } | |
268 | ||
269 | static void * __init ___alloc_bootmem(unsigned long size, unsigned long align, | |
270 | unsigned long goal, unsigned long limit) | |
271 | { | |
272 | void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit); | |
273 | ||
274 | if (mem) | |
275 | return mem; | |
276 | /* | |
277 | * Whoops, we cannot satisfy the allocation request. | |
278 | */ | |
279 | printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size); | |
280 | panic("Out of memory"); | |
281 | return NULL; | |
282 | } | |
283 | ||
284 | /** | |
285 | * __alloc_bootmem - allocate boot memory | |
286 | * @size: size of the request in bytes | |
287 | * @align: alignment of the region | |
288 | * @goal: preferred starting address of the region | |
289 | * | |
290 | * The goal is dropped if it can not be satisfied and the allocation will | |
291 | * fall back to memory below @goal. | |
292 | * | |
293 | * Allocation may happen on any node in the system. | |
294 | * | |
295 | * The function panics if the request can not be satisfied. | |
296 | */ | |
297 | void * __init __alloc_bootmem(unsigned long size, unsigned long align, | |
298 | unsigned long goal) | |
299 | { | |
300 | unsigned long limit = -1UL; | |
301 | ||
302 | return ___alloc_bootmem(size, align, goal, limit); | |
303 | } | |
304 | ||
99ab7b19 | 305 | void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat, |
ba539868 JW |
306 | unsigned long size, |
307 | unsigned long align, | |
308 | unsigned long goal, | |
309 | unsigned long limit) | |
310 | { | |
311 | void *ptr; | |
312 | ||
313 | again: | |
314 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, | |
315 | goal, limit); | |
316 | if (ptr) | |
317 | return ptr; | |
318 | ||
b1154233 | 319 | ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, |
ba539868 JW |
320 | goal, limit); |
321 | if (ptr) | |
322 | return ptr; | |
323 | ||
324 | if (goal) { | |
325 | goal = 0; | |
326 | goto again; | |
327 | } | |
328 | ||
329 | return NULL; | |
330 | } | |
331 | ||
332 | void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, | |
333 | unsigned long align, unsigned long goal) | |
334 | { | |
335 | if (WARN_ON_ONCE(slab_is_available())) | |
336 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); | |
337 | ||
338 | return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0); | |
339 | } | |
340 | ||
de498507 | 341 | static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, |
ba539868 JW |
342 | unsigned long align, unsigned long goal, |
343 | unsigned long limit) | |
344 | { | |
345 | void *ptr; | |
346 | ||
347 | ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit); | |
348 | if (ptr) | |
349 | return ptr; | |
350 | ||
351 | printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size); | |
352 | panic("Out of memory"); | |
353 | return NULL; | |
354 | } | |
355 | ||
09325873 YL |
356 | /** |
357 | * __alloc_bootmem_node - allocate boot memory from a specific node | |
358 | * @pgdat: node to allocate from | |
359 | * @size: size of the request in bytes | |
360 | * @align: alignment of the region | |
361 | * @goal: preferred starting address of the region | |
362 | * | |
363 | * The goal is dropped if it can not be satisfied and the allocation will | |
364 | * fall back to memory below @goal. | |
365 | * | |
366 | * Allocation may fall back to any node in the system if the specified node | |
367 | * can not hold the requested memory. | |
368 | * | |
369 | * The function panics if the request can not be satisfied. | |
370 | */ | |
371 | void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, | |
372 | unsigned long align, unsigned long goal) | |
373 | { | |
09325873 YL |
374 | if (WARN_ON_ONCE(slab_is_available())) |
375 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); | |
376 | ||
ba539868 | 377 | return ___alloc_bootmem_node(pgdat, size, align, goal, 0); |
09325873 YL |
378 | } |
379 | ||
380 | void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size, | |
381 | unsigned long align, unsigned long goal) | |
382 | { | |
09325873 | 383 | return __alloc_bootmem_node(pgdat, size, align, goal); |
09325873 YL |
384 | } |
385 | ||
09325873 YL |
386 | #ifndef ARCH_LOW_ADDRESS_LIMIT |
387 | #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL | |
388 | #endif | |
389 | ||
390 | /** | |
391 | * __alloc_bootmem_low - allocate low boot memory | |
392 | * @size: size of the request in bytes | |
393 | * @align: alignment of the region | |
394 | * @goal: preferred starting address of the region | |
395 | * | |
396 | * The goal is dropped if it can not be satisfied and the allocation will | |
397 | * fall back to memory below @goal. | |
398 | * | |
399 | * Allocation may happen on any node in the system. | |
400 | * | |
401 | * The function panics if the request can not be satisfied. | |
402 | */ | |
403 | void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, | |
404 | unsigned long goal) | |
405 | { | |
406 | return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); | |
407 | } | |
408 | ||
38fa4175 YL |
409 | void * __init __alloc_bootmem_low_nopanic(unsigned long size, |
410 | unsigned long align, | |
411 | unsigned long goal) | |
412 | { | |
413 | return ___alloc_bootmem_nopanic(size, align, goal, | |
414 | ARCH_LOW_ADDRESS_LIMIT); | |
415 | } | |
416 | ||
09325873 YL |
417 | /** |
418 | * __alloc_bootmem_low_node - allocate low boot memory from a specific node | |
419 | * @pgdat: node to allocate from | |
420 | * @size: size of the request in bytes | |
421 | * @align: alignment of the region | |
422 | * @goal: preferred starting address of the region | |
423 | * | |
424 | * The goal is dropped if it can not be satisfied and the allocation will | |
425 | * fall back to memory below @goal. | |
426 | * | |
427 | * Allocation may fall back to any node in the system if the specified node | |
428 | * can not hold the requested memory. | |
429 | * | |
430 | * The function panics if the request can not be satisfied. | |
431 | */ | |
432 | void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, | |
433 | unsigned long align, unsigned long goal) | |
434 | { | |
09325873 YL |
435 | if (WARN_ON_ONCE(slab_is_available())) |
436 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); | |
437 | ||
ba539868 JW |
438 | return ___alloc_bootmem_node(pgdat, size, align, goal, |
439 | ARCH_LOW_ADDRESS_LIMIT); | |
09325873 | 440 | } |