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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 | ||
eb40c4c2 | 44 | addr = memblock_find_in_range_node(goal, limit, size, align, nid); |
1f5026a7 | 45 | if (!addr) |
8bc1f91e YL |
46 | return NULL; |
47 | ||
48 | ptr = phys_to_virt(addr); | |
49 | memset(ptr, 0, size); | |
24aa0788 | 50 | memblock_reserve(addr, size); |
8bc1f91e YL |
51 | /* |
52 | * The min_count is set to 0 so that bootmem allocated blocks | |
53 | * are never reported as leaks. | |
54 | */ | |
55 | kmemleak_alloc(ptr, size, 0, 0); | |
56 | return ptr; | |
57 | } | |
58 | ||
09325873 YL |
59 | /* |
60 | * free_bootmem_late - free bootmem pages directly to page allocator | |
61 | * @addr: starting address of the range | |
62 | * @size: size of the range in bytes | |
63 | * | |
64 | * This is only useful when the bootmem allocator has already been torn | |
65 | * down, but we are still initializing the system. Pages are given directly | |
66 | * to the page allocator, no bootmem metadata is updated because it is gone. | |
67 | */ | |
68 | void __init free_bootmem_late(unsigned long addr, unsigned long size) | |
69 | { | |
70 | unsigned long cursor, end; | |
71 | ||
72 | kmemleak_free_part(__va(addr), size); | |
73 | ||
74 | cursor = PFN_UP(addr); | |
75 | end = PFN_DOWN(addr + size); | |
76 | ||
77 | for (; cursor < end; cursor++) { | |
78 | __free_pages_bootmem(pfn_to_page(cursor), 0); | |
79 | totalram_pages++; | |
80 | } | |
81 | } | |
82 | ||
83 | static void __init __free_pages_memory(unsigned long start, unsigned long end) | |
84 | { | |
6bc2e853 | 85 | unsigned long i, start_aligned, end_aligned; |
09325873 YL |
86 | int order = ilog2(BITS_PER_LONG); |
87 | ||
88 | start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1); | |
89 | end_aligned = end & ~(BITS_PER_LONG - 1); | |
90 | ||
91 | if (end_aligned <= start_aligned) { | |
92 | for (i = start; i < end; i++) | |
93 | __free_pages_bootmem(pfn_to_page(i), 0); | |
94 | ||
95 | return; | |
96 | } | |
97 | ||
98 | for (i = start; i < start_aligned; i++) | |
99 | __free_pages_bootmem(pfn_to_page(i), 0); | |
100 | ||
101 | for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG) | |
102 | __free_pages_bootmem(pfn_to_page(i), order); | |
103 | ||
104 | for (i = end_aligned; i < end; i++) | |
105 | __free_pages_bootmem(pfn_to_page(i), 0); | |
106 | } | |
107 | ||
64a02daa | 108 | unsigned long __init free_low_memory_core_early(int nodeid) |
09325873 | 109 | { |
09325873 | 110 | unsigned long count = 0; |
8a9ca34c TH |
111 | phys_addr_t start, end; |
112 | u64 i; | |
113 | ||
114 | /* free reserved array temporarily so that it's treated as free area */ | |
115 | memblock_free_reserved_regions(); | |
116 | ||
117 | for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) { | |
118 | unsigned long start_pfn = PFN_UP(start); | |
119 | unsigned long end_pfn = min_t(unsigned long, | |
120 | PFN_DOWN(end), max_low_pfn); | |
121 | if (start_pfn < end_pfn) { | |
122 | __free_pages_memory(start_pfn, end_pfn); | |
123 | count += end_pfn - start_pfn; | |
124 | } | |
09325873 YL |
125 | } |
126 | ||
8a9ca34c TH |
127 | /* put region array back? */ |
128 | memblock_reserve_reserved_regions(); | |
09325873 YL |
129 | return count; |
130 | } | |
131 | ||
132 | /** | |
133 | * free_all_bootmem_node - release a node's free pages to the buddy allocator | |
134 | * @pgdat: node to be released | |
135 | * | |
136 | * Returns the number of pages actually released. | |
137 | */ | |
138 | unsigned long __init free_all_bootmem_node(pg_data_t *pgdat) | |
139 | { | |
140 | register_page_bootmem_info_node(pgdat); | |
141 | ||
64a02daa | 142 | /* free_low_memory_core_early(MAX_NUMNODES) will be called later */ |
09325873 YL |
143 | return 0; |
144 | } | |
145 | ||
146 | /** | |
147 | * free_all_bootmem - release free pages to the buddy allocator | |
148 | * | |
149 | * Returns the number of pages actually released. | |
150 | */ | |
151 | unsigned long __init free_all_bootmem(void) | |
152 | { | |
153 | /* | |
154 | * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id | |
25985edc | 155 | * because in some case like Node0 doesn't have RAM installed |
09325873 YL |
156 | * low ram will be on Node1 |
157 | * Use MAX_NUMNODES will make sure all ranges in early_node_map[] | |
158 | * will be used instead of only Node0 related | |
159 | */ | |
64a02daa | 160 | return free_low_memory_core_early(MAX_NUMNODES); |
09325873 YL |
161 | } |
162 | ||
163 | /** | |
164 | * free_bootmem_node - mark a page range as usable | |
165 | * @pgdat: node the range resides on | |
166 | * @physaddr: starting address of the range | |
167 | * @size: size of the range in bytes | |
168 | * | |
169 | * Partial pages will be considered reserved and left as they are. | |
170 | * | |
171 | * The range must reside completely on the specified node. | |
172 | */ | |
173 | void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, | |
174 | unsigned long size) | |
175 | { | |
176 | kmemleak_free_part(__va(physaddr), size); | |
24aa0788 | 177 | memblock_free(physaddr, size); |
09325873 YL |
178 | } |
179 | ||
180 | /** | |
181 | * free_bootmem - mark a page range as usable | |
182 | * @addr: starting address of the range | |
183 | * @size: size of the range in bytes | |
184 | * | |
185 | * Partial pages will be considered reserved and left as they are. | |
186 | * | |
187 | * The range must be contiguous but may span node boundaries. | |
188 | */ | |
189 | void __init free_bootmem(unsigned long addr, unsigned long size) | |
190 | { | |
191 | kmemleak_free_part(__va(addr), size); | |
24aa0788 | 192 | memblock_free(addr, size); |
09325873 YL |
193 | } |
194 | ||
195 | static void * __init ___alloc_bootmem_nopanic(unsigned long size, | |
196 | unsigned long align, | |
197 | unsigned long goal, | |
198 | unsigned long limit) | |
199 | { | |
200 | void *ptr; | |
201 | ||
202 | if (WARN_ON_ONCE(slab_is_available())) | |
203 | return kzalloc(size, GFP_NOWAIT); | |
204 | ||
205 | restart: | |
206 | ||
207 | ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit); | |
208 | ||
209 | if (ptr) | |
210 | return ptr; | |
211 | ||
212 | if (goal != 0) { | |
213 | goal = 0; | |
214 | goto restart; | |
215 | } | |
216 | ||
217 | return NULL; | |
218 | } | |
219 | ||
220 | /** | |
221 | * __alloc_bootmem_nopanic - allocate boot memory without panicking | |
222 | * @size: size of the request in bytes | |
223 | * @align: alignment of the region | |
224 | * @goal: preferred starting address of the region | |
225 | * | |
226 | * The goal is dropped if it can not be satisfied and the allocation will | |
227 | * fall back to memory below @goal. | |
228 | * | |
229 | * Allocation may happen on any node in the system. | |
230 | * | |
231 | * Returns NULL on failure. | |
232 | */ | |
233 | void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, | |
234 | unsigned long goal) | |
235 | { | |
236 | unsigned long limit = -1UL; | |
237 | ||
238 | return ___alloc_bootmem_nopanic(size, align, goal, limit); | |
239 | } | |
240 | ||
241 | static void * __init ___alloc_bootmem(unsigned long size, unsigned long align, | |
242 | unsigned long goal, unsigned long limit) | |
243 | { | |
244 | void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit); | |
245 | ||
246 | if (mem) | |
247 | return mem; | |
248 | /* | |
249 | * Whoops, we cannot satisfy the allocation request. | |
250 | */ | |
251 | printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size); | |
252 | panic("Out of memory"); | |
253 | return NULL; | |
254 | } | |
255 | ||
256 | /** | |
257 | * __alloc_bootmem - allocate boot memory | |
258 | * @size: size of the request in bytes | |
259 | * @align: alignment of the region | |
260 | * @goal: preferred starting address of the region | |
261 | * | |
262 | * The goal is dropped if it can not be satisfied and the allocation will | |
263 | * fall back to memory below @goal. | |
264 | * | |
265 | * Allocation may happen on any node in the system. | |
266 | * | |
267 | * The function panics if the request can not be satisfied. | |
268 | */ | |
269 | void * __init __alloc_bootmem(unsigned long size, unsigned long align, | |
270 | unsigned long goal) | |
271 | { | |
272 | unsigned long limit = -1UL; | |
273 | ||
274 | return ___alloc_bootmem(size, align, goal, limit); | |
275 | } | |
276 | ||
ba539868 JW |
277 | static void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat, |
278 | unsigned long size, | |
279 | unsigned long align, | |
280 | unsigned long goal, | |
281 | unsigned long limit) | |
282 | { | |
283 | void *ptr; | |
284 | ||
285 | again: | |
286 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, | |
287 | goal, limit); | |
288 | if (ptr) | |
289 | return ptr; | |
290 | ||
291 | ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, | |
292 | goal, limit); | |
293 | if (ptr) | |
294 | return ptr; | |
295 | ||
296 | if (goal) { | |
297 | goal = 0; | |
298 | goto again; | |
299 | } | |
300 | ||
301 | return NULL; | |
302 | } | |
303 | ||
304 | void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, | |
305 | unsigned long align, unsigned long goal) | |
306 | { | |
307 | if (WARN_ON_ONCE(slab_is_available())) | |
308 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); | |
309 | ||
310 | return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0); | |
311 | } | |
312 | ||
313 | void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, | |
314 | unsigned long align, unsigned long goal, | |
315 | unsigned long limit) | |
316 | { | |
317 | void *ptr; | |
318 | ||
319 | ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit); | |
320 | if (ptr) | |
321 | return ptr; | |
322 | ||
323 | printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size); | |
324 | panic("Out of memory"); | |
325 | return NULL; | |
326 | } | |
327 | ||
09325873 YL |
328 | /** |
329 | * __alloc_bootmem_node - allocate boot memory from a specific node | |
330 | * @pgdat: node to allocate from | |
331 | * @size: size of the request in bytes | |
332 | * @align: alignment of the region | |
333 | * @goal: preferred starting address of the region | |
334 | * | |
335 | * The goal is dropped if it can not be satisfied and the allocation will | |
336 | * fall back to memory below @goal. | |
337 | * | |
338 | * Allocation may fall back to any node in the system if the specified node | |
339 | * can not hold the requested memory. | |
340 | * | |
341 | * The function panics if the request can not be satisfied. | |
342 | */ | |
343 | void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, | |
344 | unsigned long align, unsigned long goal) | |
345 | { | |
09325873 YL |
346 | if (WARN_ON_ONCE(slab_is_available())) |
347 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); | |
348 | ||
ba539868 | 349 | return ___alloc_bootmem_node(pgdat, size, align, goal, 0); |
09325873 YL |
350 | } |
351 | ||
352 | void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size, | |
353 | unsigned long align, unsigned long goal) | |
354 | { | |
09325873 | 355 | return __alloc_bootmem_node(pgdat, size, align, goal); |
09325873 YL |
356 | } |
357 | ||
09325873 YL |
358 | #ifndef ARCH_LOW_ADDRESS_LIMIT |
359 | #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL | |
360 | #endif | |
361 | ||
362 | /** | |
363 | * __alloc_bootmem_low - allocate low boot memory | |
364 | * @size: size of the request in bytes | |
365 | * @align: alignment of the region | |
366 | * @goal: preferred starting address of the region | |
367 | * | |
368 | * The goal is dropped if it can not be satisfied and the allocation will | |
369 | * fall back to memory below @goal. | |
370 | * | |
371 | * Allocation may happen on any node in the system. | |
372 | * | |
373 | * The function panics if the request can not be satisfied. | |
374 | */ | |
375 | void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, | |
376 | unsigned long goal) | |
377 | { | |
378 | return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); | |
379 | } | |
380 | ||
381 | /** | |
382 | * __alloc_bootmem_low_node - allocate low boot memory from a specific node | |
383 | * @pgdat: node to allocate from | |
384 | * @size: size of the request in bytes | |
385 | * @align: alignment of the region | |
386 | * @goal: preferred starting address of the region | |
387 | * | |
388 | * The goal is dropped if it can not be satisfied and the allocation will | |
389 | * fall back to memory below @goal. | |
390 | * | |
391 | * Allocation may fall back to any node in the system if the specified node | |
392 | * can not hold the requested memory. | |
393 | * | |
394 | * The function panics if the request can not be satisfied. | |
395 | */ | |
396 | void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, | |
397 | unsigned long align, unsigned long goal) | |
398 | { | |
09325873 YL |
399 | if (WARN_ON_ONCE(slab_is_available())) |
400 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); | |
401 | ||
ba539868 JW |
402 | return ___alloc_bootmem_node(pgdat, size, align, goal, |
403 | ARCH_LOW_ADDRESS_LIMIT); | |
09325873 | 404 | } |