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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> | |
15 | #include <linux/module.h> | |
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); | |
50 | memblock_x86_reserve_range(addr, addr + size, "BOOTMEM"); | |
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 | { | |
85 | int i; | |
86 | unsigned long start_aligned, end_aligned; | |
87 | int order = ilog2(BITS_PER_LONG); | |
88 | ||
89 | start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1); | |
90 | end_aligned = end & ~(BITS_PER_LONG - 1); | |
91 | ||
92 | if (end_aligned <= start_aligned) { | |
93 | for (i = start; i < end; i++) | |
94 | __free_pages_bootmem(pfn_to_page(i), 0); | |
95 | ||
96 | return; | |
97 | } | |
98 | ||
99 | for (i = start; i < start_aligned; i++) | |
100 | __free_pages_bootmem(pfn_to_page(i), 0); | |
101 | ||
102 | for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG) | |
103 | __free_pages_bootmem(pfn_to_page(i), order); | |
104 | ||
105 | for (i = end_aligned; i < end; i++) | |
106 | __free_pages_bootmem(pfn_to_page(i), 0); | |
107 | } | |
108 | ||
109 | unsigned long __init free_all_memory_core_early(int nodeid) | |
110 | { | |
111 | int i; | |
112 | u64 start, end; | |
113 | unsigned long count = 0; | |
114 | struct range *range = NULL; | |
115 | int nr_range; | |
116 | ||
117 | nr_range = get_free_all_memory_range(&range, nodeid); | |
118 | ||
119 | for (i = 0; i < nr_range; i++) { | |
120 | start = range[i].start; | |
121 | end = range[i].end; | |
122 | count += end - start; | |
123 | __free_pages_memory(start, end); | |
124 | } | |
125 | ||
126 | return count; | |
127 | } | |
128 | ||
129 | /** | |
130 | * free_all_bootmem_node - release a node's free pages to the buddy allocator | |
131 | * @pgdat: node to be released | |
132 | * | |
133 | * Returns the number of pages actually released. | |
134 | */ | |
135 | unsigned long __init free_all_bootmem_node(pg_data_t *pgdat) | |
136 | { | |
137 | register_page_bootmem_info_node(pgdat); | |
138 | ||
139 | /* free_all_memory_core_early(MAX_NUMNODES) will be called later */ | |
140 | return 0; | |
141 | } | |
142 | ||
143 | /** | |
144 | * free_all_bootmem - release free pages to the buddy allocator | |
145 | * | |
146 | * Returns the number of pages actually released. | |
147 | */ | |
148 | unsigned long __init free_all_bootmem(void) | |
149 | { | |
150 | /* | |
151 | * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id | |
25985edc | 152 | * because in some case like Node0 doesn't have RAM installed |
09325873 YL |
153 | * low ram will be on Node1 |
154 | * Use MAX_NUMNODES will make sure all ranges in early_node_map[] | |
155 | * will be used instead of only Node0 related | |
156 | */ | |
157 | return free_all_memory_core_early(MAX_NUMNODES); | |
158 | } | |
159 | ||
160 | /** | |
161 | * free_bootmem_node - mark a page range as usable | |
162 | * @pgdat: node the range resides on | |
163 | * @physaddr: starting address of the range | |
164 | * @size: size of the range in bytes | |
165 | * | |
166 | * Partial pages will be considered reserved and left as they are. | |
167 | * | |
168 | * The range must reside completely on the specified node. | |
169 | */ | |
170 | void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, | |
171 | unsigned long size) | |
172 | { | |
173 | kmemleak_free_part(__va(physaddr), size); | |
174 | memblock_x86_free_range(physaddr, physaddr + size); | |
175 | } | |
176 | ||
177 | /** | |
178 | * free_bootmem - mark a page range as usable | |
179 | * @addr: starting address of the range | |
180 | * @size: size of the range in bytes | |
181 | * | |
182 | * Partial pages will be considered reserved and left as they are. | |
183 | * | |
184 | * The range must be contiguous but may span node boundaries. | |
185 | */ | |
186 | void __init free_bootmem(unsigned long addr, unsigned long size) | |
187 | { | |
188 | kmemleak_free_part(__va(addr), size); | |
189 | memblock_x86_free_range(addr, addr + size); | |
190 | } | |
191 | ||
192 | static void * __init ___alloc_bootmem_nopanic(unsigned long size, | |
193 | unsigned long align, | |
194 | unsigned long goal, | |
195 | unsigned long limit) | |
196 | { | |
197 | void *ptr; | |
198 | ||
199 | if (WARN_ON_ONCE(slab_is_available())) | |
200 | return kzalloc(size, GFP_NOWAIT); | |
201 | ||
202 | restart: | |
203 | ||
204 | ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit); | |
205 | ||
206 | if (ptr) | |
207 | return ptr; | |
208 | ||
209 | if (goal != 0) { | |
210 | goal = 0; | |
211 | goto restart; | |
212 | } | |
213 | ||
214 | return NULL; | |
215 | } | |
216 | ||
217 | /** | |
218 | * __alloc_bootmem_nopanic - allocate boot memory without panicking | |
219 | * @size: size of the request in bytes | |
220 | * @align: alignment of the region | |
221 | * @goal: preferred starting address of the region | |
222 | * | |
223 | * The goal is dropped if it can not be satisfied and the allocation will | |
224 | * fall back to memory below @goal. | |
225 | * | |
226 | * Allocation may happen on any node in the system. | |
227 | * | |
228 | * Returns NULL on failure. | |
229 | */ | |
230 | void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, | |
231 | unsigned long goal) | |
232 | { | |
233 | unsigned long limit = -1UL; | |
234 | ||
235 | return ___alloc_bootmem_nopanic(size, align, goal, limit); | |
236 | } | |
237 | ||
238 | static void * __init ___alloc_bootmem(unsigned long size, unsigned long align, | |
239 | unsigned long goal, unsigned long limit) | |
240 | { | |
241 | void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit); | |
242 | ||
243 | if (mem) | |
244 | return mem; | |
245 | /* | |
246 | * Whoops, we cannot satisfy the allocation request. | |
247 | */ | |
248 | printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size); | |
249 | panic("Out of memory"); | |
250 | return NULL; | |
251 | } | |
252 | ||
253 | /** | |
254 | * __alloc_bootmem - allocate boot memory | |
255 | * @size: size of the request in bytes | |
256 | * @align: alignment of the region | |
257 | * @goal: preferred starting address of the region | |
258 | * | |
259 | * The goal is dropped if it can not be satisfied and the allocation will | |
260 | * fall back to memory below @goal. | |
261 | * | |
262 | * Allocation may happen on any node in the system. | |
263 | * | |
264 | * The function panics if the request can not be satisfied. | |
265 | */ | |
266 | void * __init __alloc_bootmem(unsigned long size, unsigned long align, | |
267 | unsigned long goal) | |
268 | { | |
269 | unsigned long limit = -1UL; | |
270 | ||
271 | return ___alloc_bootmem(size, align, goal, limit); | |
272 | } | |
273 | ||
274 | /** | |
275 | * __alloc_bootmem_node - allocate boot memory from a specific node | |
276 | * @pgdat: node to allocate from | |
277 | * @size: size of the request in bytes | |
278 | * @align: alignment of the region | |
279 | * @goal: preferred starting address of the region | |
280 | * | |
281 | * The goal is dropped if it can not be satisfied and the allocation will | |
282 | * fall back to memory below @goal. | |
283 | * | |
284 | * Allocation may fall back to any node in the system if the specified node | |
285 | * can not hold the requested memory. | |
286 | * | |
287 | * The function panics if the request can not be satisfied. | |
288 | */ | |
289 | void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, | |
290 | unsigned long align, unsigned long goal) | |
291 | { | |
292 | void *ptr; | |
293 | ||
294 | if (WARN_ON_ONCE(slab_is_available())) | |
295 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); | |
296 | ||
297 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, | |
298 | goal, -1ULL); | |
299 | if (ptr) | |
300 | return ptr; | |
301 | ||
302 | return __alloc_memory_core_early(MAX_NUMNODES, size, align, | |
303 | goal, -1ULL); | |
304 | } | |
305 | ||
306 | void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size, | |
307 | unsigned long align, unsigned long goal) | |
308 | { | |
09325873 | 309 | return __alloc_bootmem_node(pgdat, size, align, goal); |
09325873 YL |
310 | } |
311 | ||
312 | #ifdef CONFIG_SPARSEMEM | |
313 | /** | |
314 | * alloc_bootmem_section - allocate boot memory from a specific section | |
315 | * @size: size of the request in bytes | |
316 | * @section_nr: sparse map section to allocate from | |
317 | * | |
318 | * Return NULL on failure. | |
319 | */ | |
320 | void * __init alloc_bootmem_section(unsigned long size, | |
321 | unsigned long section_nr) | |
322 | { | |
323 | unsigned long pfn, goal, limit; | |
324 | ||
325 | pfn = section_nr_to_pfn(section_nr); | |
326 | goal = pfn << PAGE_SHIFT; | |
327 | limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT; | |
328 | ||
329 | return __alloc_memory_core_early(early_pfn_to_nid(pfn), size, | |
330 | SMP_CACHE_BYTES, goal, limit); | |
331 | } | |
332 | #endif | |
333 | ||
334 | void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, | |
335 | unsigned long align, unsigned long goal) | |
336 | { | |
337 | void *ptr; | |
338 | ||
339 | if (WARN_ON_ONCE(slab_is_available())) | |
340 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); | |
341 | ||
342 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, | |
343 | goal, -1ULL); | |
344 | if (ptr) | |
345 | return ptr; | |
346 | ||
347 | return __alloc_bootmem_nopanic(size, align, goal); | |
348 | } | |
349 | ||
350 | #ifndef ARCH_LOW_ADDRESS_LIMIT | |
351 | #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL | |
352 | #endif | |
353 | ||
354 | /** | |
355 | * __alloc_bootmem_low - allocate low boot memory | |
356 | * @size: size of the request in bytes | |
357 | * @align: alignment of the region | |
358 | * @goal: preferred starting address of the region | |
359 | * | |
360 | * The goal is dropped if it can not be satisfied and the allocation will | |
361 | * fall back to memory below @goal. | |
362 | * | |
363 | * Allocation may happen on any node in the system. | |
364 | * | |
365 | * The function panics if the request can not be satisfied. | |
366 | */ | |
367 | void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, | |
368 | unsigned long goal) | |
369 | { | |
370 | return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); | |
371 | } | |
372 | ||
373 | /** | |
374 | * __alloc_bootmem_low_node - allocate low boot memory from a specific node | |
375 | * @pgdat: node to allocate from | |
376 | * @size: size of the request in bytes | |
377 | * @align: alignment of the region | |
378 | * @goal: preferred starting address of the region | |
379 | * | |
380 | * The goal is dropped if it can not be satisfied and the allocation will | |
381 | * fall back to memory below @goal. | |
382 | * | |
383 | * Allocation may fall back to any node in the system if the specified node | |
384 | * can not hold the requested memory. | |
385 | * | |
386 | * The function panics if the request can not be satisfied. | |
387 | */ | |
388 | void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, | |
389 | unsigned long align, unsigned long goal) | |
390 | { | |
391 | void *ptr; | |
392 | ||
393 | if (WARN_ON_ONCE(slab_is_available())) | |
394 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); | |
395 | ||
396 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, | |
397 | goal, ARCH_LOW_ADDRESS_LIMIT); | |
398 | if (ptr) | |
399 | return ptr; | |
400 | ||
401 | return __alloc_memory_core_early(MAX_NUMNODES, size, align, | |
402 | goal, ARCH_LOW_ADDRESS_LIMIT); | |
403 | } |