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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/export.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 | |
26 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
27 | struct pglist_data __refdata contig_page_data; |
28 | EXPORT_SYMBOL(contig_page_data); |
29 | #endif |
30 | |
31 | unsigned long max_low_pfn; |
32 | unsigned long min_low_pfn; |
33 | unsigned long max_pfn; |
34 | |
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 | |
44 | addr = memblock_find_in_range_node(goal, limit, size, align, nid); |
45 | if (!addr) |
46 | return NULL; |
47 | |
48 | ptr = phys_to_virt(addr); |
49 | memset(ptr, 0, size); |
50 | memblock_reserve(addr, size); |
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 | |
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_low_memory_core_early(int nodeid) |
110 | { |
111 | unsigned long count = 0; |
112 | phys_addr_t start, end; |
113 | u64 i; |
114 | |
115 | /* free reserved array temporarily so that it's treated as free area */ |
116 | memblock_free_reserved_regions(); |
117 | |
118 | for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) { |
119 | unsigned long start_pfn = PFN_UP(start); |
120 | unsigned long end_pfn = min_t(unsigned long, |
121 | PFN_DOWN(end), max_low_pfn); |
122 | if (start_pfn < end_pfn) { |
123 | __free_pages_memory(start_pfn, end_pfn); |
124 | count += end_pfn - start_pfn; |
125 | } |
126 | } |
127 | |
128 | /* put region array back? */ |
129 | memblock_reserve_reserved_regions(); |
130 | return count; |
131 | } |
132 | |
133 | /** |
134 | * free_all_bootmem_node - release a node's free pages to the buddy allocator |
135 | * @pgdat: node to be released |
136 | * |
137 | * Returns the number of pages actually released. |
138 | */ |
139 | unsigned long __init free_all_bootmem_node(pg_data_t *pgdat) |
140 | { |
141 | register_page_bootmem_info_node(pgdat); |
142 | |
143 | /* free_low_memory_core_early(MAX_NUMNODES) will be called later */ |
144 | return 0; |
145 | } |
146 | |
147 | /** |
148 | * free_all_bootmem - release free pages to the buddy allocator |
149 | * |
150 | * Returns the number of pages actually released. |
151 | */ |
152 | unsigned long __init free_all_bootmem(void) |
153 | { |
154 | /* |
155 | * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id |
156 | * because in some case like Node0 doesn't have RAM installed |
157 | * low ram will be on Node1 |
158 | * Use MAX_NUMNODES will make sure all ranges in early_node_map[] |
159 | * will be used instead of only Node0 related |
160 | */ |
161 | return free_low_memory_core_early(MAX_NUMNODES); |
162 | } |
163 | |
164 | /** |
165 | * free_bootmem_node - mark a page range as usable |
166 | * @pgdat: node the range resides on |
167 | * @physaddr: starting address of the range |
168 | * @size: size of the range in bytes |
169 | * |
170 | * Partial pages will be considered reserved and left as they are. |
171 | * |
172 | * The range must reside completely on the specified node. |
173 | */ |
174 | void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, |
175 | unsigned long size) |
176 | { |
177 | kmemleak_free_part(__va(physaddr), size); |
178 | memblock_free(physaddr, size); |
179 | } |
180 | |
181 | /** |
182 | * free_bootmem - mark a page range as usable |
183 | * @addr: starting address of the range |
184 | * @size: size of the range in bytes |
185 | * |
186 | * Partial pages will be considered reserved and left as they are. |
187 | * |
188 | * The range must be contiguous but may span node boundaries. |
189 | */ |
190 | void __init free_bootmem(unsigned long addr, unsigned long size) |
191 | { |
192 | kmemleak_free_part(__va(addr), size); |
193 | memblock_free(addr, size); |
194 | } |
195 | |
196 | static void * __init ___alloc_bootmem_nopanic(unsigned long size, |
197 | unsigned long align, |
198 | unsigned long goal, |
199 | unsigned long limit) |
200 | { |
201 | void *ptr; |
202 | |
203 | if (WARN_ON_ONCE(slab_is_available())) |
204 | return kzalloc(size, GFP_NOWAIT); |
205 | |
206 | restart: |
207 | |
208 | ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit); |
209 | |
210 | if (ptr) |
211 | return ptr; |
212 | |
213 | if (goal != 0) { |
214 | goal = 0; |
215 | goto restart; |
216 | } |
217 | |
218 | return NULL; |
219 | } |
220 | |
221 | /** |
222 | * __alloc_bootmem_nopanic - allocate boot memory without panicking |
223 | * @size: size of the request in bytes |
224 | * @align: alignment of the region |
225 | * @goal: preferred starting address of the region |
226 | * |
227 | * The goal is dropped if it can not be satisfied and the allocation will |
228 | * fall back to memory below @goal. |
229 | * |
230 | * Allocation may happen on any node in the system. |
231 | * |
232 | * Returns NULL on failure. |
233 | */ |
234 | void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, |
235 | unsigned long goal) |
236 | { |
237 | unsigned long limit = -1UL; |
238 | |
239 | return ___alloc_bootmem_nopanic(size, align, goal, limit); |
240 | } |
241 | |
242 | static void * __init ___alloc_bootmem(unsigned long size, unsigned long align, |
243 | unsigned long goal, unsigned long limit) |
244 | { |
245 | void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit); |
246 | |
247 | if (mem) |
248 | return mem; |
249 | /* |
250 | * Whoops, we cannot satisfy the allocation request. |
251 | */ |
252 | printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size); |
253 | panic("Out of memory"); |
254 | return NULL; |
255 | } |
256 | |
257 | /** |
258 | * __alloc_bootmem - allocate boot memory |
259 | * @size: size of the request in bytes |
260 | * @align: alignment of the region |
261 | * @goal: preferred starting address of the region |
262 | * |
263 | * The goal is dropped if it can not be satisfied and the allocation will |
264 | * fall back to memory below @goal. |
265 | * |
266 | * Allocation may happen on any node in the system. |
267 | * |
268 | * The function panics if the request can not be satisfied. |
269 | */ |
270 | void * __init __alloc_bootmem(unsigned long size, unsigned long align, |
271 | unsigned long goal) |
272 | { |
273 | unsigned long limit = -1UL; |
274 | |
275 | return ___alloc_bootmem(size, align, goal, limit); |
276 | } |
277 | |
278 | /** |
279 | * __alloc_bootmem_node - allocate boot memory from a specific node |
280 | * @pgdat: node to allocate from |
281 | * @size: size of the request in bytes |
282 | * @align: alignment of the region |
283 | * @goal: preferred starting address of the region |
284 | * |
285 | * The goal is dropped if it can not be satisfied and the allocation will |
286 | * fall back to memory below @goal. |
287 | * |
288 | * Allocation may fall back to any node in the system if the specified node |
289 | * can not hold the requested memory. |
290 | * |
291 | * The function panics if the request can not be satisfied. |
292 | */ |
293 | void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, |
294 | unsigned long align, unsigned long goal) |
295 | { |
296 | void *ptr; |
297 | |
298 | if (WARN_ON_ONCE(slab_is_available())) |
299 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
300 | |
301 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, |
302 | goal, -1ULL); |
303 | if (ptr) |
304 | return ptr; |
305 | |
306 | return __alloc_memory_core_early(MAX_NUMNODES, size, align, |
307 | goal, -1ULL); |
308 | } |
309 | |
310 | void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size, |
311 | unsigned long align, unsigned long goal) |
312 | { |
313 | return __alloc_bootmem_node(pgdat, size, align, goal); |
314 | } |
315 | |
316 | #ifdef CONFIG_SPARSEMEM |
317 | /** |
318 | * alloc_bootmem_section - allocate boot memory from a specific section |
319 | * @size: size of the request in bytes |
320 | * @section_nr: sparse map section to allocate from |
321 | * |
322 | * Return NULL on failure. |
323 | */ |
324 | void * __init alloc_bootmem_section(unsigned long size, |
325 | unsigned long section_nr) |
326 | { |
327 | unsigned long pfn, goal, limit; |
328 | |
329 | pfn = section_nr_to_pfn(section_nr); |
330 | goal = pfn << PAGE_SHIFT; |
331 | limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT; |
332 | |
333 | return __alloc_memory_core_early(early_pfn_to_nid(pfn), size, |
334 | SMP_CACHE_BYTES, goal, limit); |
335 | } |
336 | #endif |
337 | |
338 | void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, |
339 | unsigned long align, unsigned long goal) |
340 | { |
341 | void *ptr; |
342 | |
343 | if (WARN_ON_ONCE(slab_is_available())) |
344 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
345 | |
346 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, |
347 | goal, -1ULL); |
348 | if (ptr) |
349 | return ptr; |
350 | |
351 | return __alloc_bootmem_nopanic(size, align, goal); |
352 | } |
353 | |
354 | #ifndef ARCH_LOW_ADDRESS_LIMIT |
355 | #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL |
356 | #endif |
357 | |
358 | /** |
359 | * __alloc_bootmem_low - allocate low boot memory |
360 | * @size: size of the request in bytes |
361 | * @align: alignment of the region |
362 | * @goal: preferred starting address of the region |
363 | * |
364 | * The goal is dropped if it can not be satisfied and the allocation will |
365 | * fall back to memory below @goal. |
366 | * |
367 | * Allocation may happen on any node in the system. |
368 | * |
369 | * The function panics if the request can not be satisfied. |
370 | */ |
371 | void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, |
372 | unsigned long goal) |
373 | { |
374 | return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); |
375 | } |
376 | |
377 | /** |
378 | * __alloc_bootmem_low_node - allocate low boot memory from a specific node |
379 | * @pgdat: node to allocate from |
380 | * @size: size of the request in bytes |
381 | * @align: alignment of the region |
382 | * @goal: preferred starting address of the region |
383 | * |
384 | * The goal is dropped if it can not be satisfied and the allocation will |
385 | * fall back to memory below @goal. |
386 | * |
387 | * Allocation may fall back to any node in the system if the specified node |
388 | * can not hold the requested memory. |
389 | * |
390 | * The function panics if the request can not be satisfied. |
391 | */ |
392 | void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, |
393 | unsigned long align, unsigned long goal) |
394 | { |
395 | void *ptr; |
396 | |
397 | if (WARN_ON_ONCE(slab_is_available())) |
398 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
399 | |
400 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, |
401 | goal, ARCH_LOW_ADDRESS_LIMIT); |
402 | if (ptr) |
403 | return ptr; |
404 | |
405 | return __alloc_memory_core_early(MAX_NUMNODES, size, align, |
406 | goal, ARCH_LOW_ADDRESS_LIMIT); |
407 | } |
408 |
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