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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/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 | |
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 = find_memory_core_early(nid, size, align, goal, limit); |
45 | |
46 | if (addr == MEMBLOCK_ERROR) |
47 | return NULL; |
48 | |
49 | ptr = phys_to_virt(addr); |
50 | memset(ptr, 0, size); |
51 | memblock_x86_reserve_range(addr, addr + size, "BOOTMEM"); |
52 | /* |
53 | * The min_count is set to 0 so that bootmem allocated blocks |
54 | * are never reported as leaks. |
55 | */ |
56 | kmemleak_alloc(ptr, size, 0, 0); |
57 | return ptr; |
58 | } |
59 | |
60 | /* |
61 | * free_bootmem_late - free bootmem pages directly to page allocator |
62 | * @addr: starting address of the range |
63 | * @size: size of the range in bytes |
64 | * |
65 | * This is only useful when the bootmem allocator has already been torn |
66 | * down, but we are still initializing the system. Pages are given directly |
67 | * to the page allocator, no bootmem metadata is updated because it is gone. |
68 | */ |
69 | void __init free_bootmem_late(unsigned long addr, unsigned long size) |
70 | { |
71 | unsigned long cursor, end; |
72 | |
73 | kmemleak_free_part(__va(addr), size); |
74 | |
75 | cursor = PFN_UP(addr); |
76 | end = PFN_DOWN(addr + size); |
77 | |
78 | for (; cursor < end; cursor++) { |
79 | __free_pages_bootmem(pfn_to_page(cursor), 0); |
80 | totalram_pages++; |
81 | } |
82 | } |
83 | |
84 | static void __init __free_pages_memory(unsigned long start, unsigned long end) |
85 | { |
86 | int i; |
87 | unsigned long start_aligned, end_aligned; |
88 | int order = ilog2(BITS_PER_LONG); |
89 | |
90 | start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1); |
91 | end_aligned = end & ~(BITS_PER_LONG - 1); |
92 | |
93 | if (end_aligned <= start_aligned) { |
94 | for (i = start; i < end; i++) |
95 | __free_pages_bootmem(pfn_to_page(i), 0); |
96 | |
97 | return; |
98 | } |
99 | |
100 | for (i = start; i < start_aligned; i++) |
101 | __free_pages_bootmem(pfn_to_page(i), 0); |
102 | |
103 | for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG) |
104 | __free_pages_bootmem(pfn_to_page(i), order); |
105 | |
106 | for (i = end_aligned; i < end; i++) |
107 | __free_pages_bootmem(pfn_to_page(i), 0); |
108 | } |
109 | |
110 | unsigned long __init free_all_memory_core_early(int nodeid) |
111 | { |
112 | int i; |
113 | u64 start, end; |
114 | unsigned long count = 0; |
115 | struct range *range = NULL; |
116 | int nr_range; |
117 | |
118 | nr_range = get_free_all_memory_range(&range, nodeid); |
119 | |
120 | for (i = 0; i < nr_range; i++) { |
121 | start = range[i].start; |
122 | end = range[i].end; |
123 | count += end - start; |
124 | __free_pages_memory(start, end); |
125 | } |
126 | |
127 | return count; |
128 | } |
129 | |
130 | /** |
131 | * free_all_bootmem_node - release a node's free pages to the buddy allocator |
132 | * @pgdat: node to be released |
133 | * |
134 | * Returns the number of pages actually released. |
135 | */ |
136 | unsigned long __init free_all_bootmem_node(pg_data_t *pgdat) |
137 | { |
138 | register_page_bootmem_info_node(pgdat); |
139 | |
140 | /* free_all_memory_core_early(MAX_NUMNODES) will be called later */ |
141 | return 0; |
142 | } |
143 | |
144 | /** |
145 | * free_all_bootmem - release free pages to the buddy allocator |
146 | * |
147 | * Returns the number of pages actually released. |
148 | */ |
149 | unsigned long __init free_all_bootmem(void) |
150 | { |
151 | /* |
152 | * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id |
153 | * because in some case like Node0 doesn't have RAM installed |
154 | * low ram will be on Node1 |
155 | * Use MAX_NUMNODES will make sure all ranges in early_node_map[] |
156 | * will be used instead of only Node0 related |
157 | */ |
158 | return free_all_memory_core_early(MAX_NUMNODES); |
159 | } |
160 | |
161 | /** |
162 | * free_bootmem_node - mark a page range as usable |
163 | * @pgdat: node the range resides on |
164 | * @physaddr: starting address of the range |
165 | * @size: size of the range in bytes |
166 | * |
167 | * Partial pages will be considered reserved and left as they are. |
168 | * |
169 | * The range must reside completely on the specified node. |
170 | */ |
171 | void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, |
172 | unsigned long size) |
173 | { |
174 | kmemleak_free_part(__va(physaddr), size); |
175 | memblock_x86_free_range(physaddr, physaddr + size); |
176 | } |
177 | |
178 | /** |
179 | * free_bootmem - mark a page range as usable |
180 | * @addr: starting address of the range |
181 | * @size: size of the range in bytes |
182 | * |
183 | * Partial pages will be considered reserved and left as they are. |
184 | * |
185 | * The range must be contiguous but may span node boundaries. |
186 | */ |
187 | void __init free_bootmem(unsigned long addr, unsigned long size) |
188 | { |
189 | kmemleak_free_part(__va(addr), size); |
190 | memblock_x86_free_range(addr, addr + size); |
191 | } |
192 | |
193 | static void * __init ___alloc_bootmem_nopanic(unsigned long size, |
194 | unsigned long align, |
195 | unsigned long goal, |
196 | unsigned long limit) |
197 | { |
198 | void *ptr; |
199 | |
200 | if (WARN_ON_ONCE(slab_is_available())) |
201 | return kzalloc(size, GFP_NOWAIT); |
202 | |
203 | restart: |
204 | |
205 | ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit); |
206 | |
207 | if (ptr) |
208 | return ptr; |
209 | |
210 | if (goal != 0) { |
211 | goal = 0; |
212 | goto restart; |
213 | } |
214 | |
215 | return NULL; |
216 | } |
217 | |
218 | /** |
219 | * __alloc_bootmem_nopanic - allocate boot memory without panicking |
220 | * @size: size of the request in bytes |
221 | * @align: alignment of the region |
222 | * @goal: preferred starting address of the region |
223 | * |
224 | * The goal is dropped if it can not be satisfied and the allocation will |
225 | * fall back to memory below @goal. |
226 | * |
227 | * Allocation may happen on any node in the system. |
228 | * |
229 | * Returns NULL on failure. |
230 | */ |
231 | void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, |
232 | unsigned long goal) |
233 | { |
234 | unsigned long limit = -1UL; |
235 | |
236 | return ___alloc_bootmem_nopanic(size, align, goal, limit); |
237 | } |
238 | |
239 | static void * __init ___alloc_bootmem(unsigned long size, unsigned long align, |
240 | unsigned long goal, unsigned long limit) |
241 | { |
242 | void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit); |
243 | |
244 | if (mem) |
245 | return mem; |
246 | /* |
247 | * Whoops, we cannot satisfy the allocation request. |
248 | */ |
249 | printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size); |
250 | panic("Out of memory"); |
251 | return NULL; |
252 | } |
253 | |
254 | /** |
255 | * __alloc_bootmem - allocate boot memory |
256 | * @size: size of the request in bytes |
257 | * @align: alignment of the region |
258 | * @goal: preferred starting address of the region |
259 | * |
260 | * The goal is dropped if it can not be satisfied and the allocation will |
261 | * fall back to memory below @goal. |
262 | * |
263 | * Allocation may happen on any node in the system. |
264 | * |
265 | * The function panics if the request can not be satisfied. |
266 | */ |
267 | void * __init __alloc_bootmem(unsigned long size, unsigned long align, |
268 | unsigned long goal) |
269 | { |
270 | unsigned long limit = -1UL; |
271 | |
272 | return ___alloc_bootmem(size, align, goal, limit); |
273 | } |
274 | |
275 | /** |
276 | * __alloc_bootmem_node - allocate boot memory from a specific node |
277 | * @pgdat: node to allocate from |
278 | * @size: size of the request in bytes |
279 | * @align: alignment of the region |
280 | * @goal: preferred starting address of the region |
281 | * |
282 | * The goal is dropped if it can not be satisfied and the allocation will |
283 | * fall back to memory below @goal. |
284 | * |
285 | * Allocation may fall back to any node in the system if the specified node |
286 | * can not hold the requested memory. |
287 | * |
288 | * The function panics if the request can not be satisfied. |
289 | */ |
290 | void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, |
291 | unsigned long align, unsigned long goal) |
292 | { |
293 | void *ptr; |
294 | |
295 | if (WARN_ON_ONCE(slab_is_available())) |
296 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
297 | |
298 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, |
299 | goal, -1ULL); |
300 | if (ptr) |
301 | return ptr; |
302 | |
303 | return __alloc_memory_core_early(MAX_NUMNODES, size, align, |
304 | goal, -1ULL); |
305 | } |
306 | |
307 | void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size, |
308 | unsigned long align, unsigned long goal) |
309 | { |
310 | #ifdef MAX_DMA32_PFN |
311 | unsigned long end_pfn; |
312 | |
313 | if (WARN_ON_ONCE(slab_is_available())) |
314 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
315 | |
316 | /* update goal according ...MAX_DMA32_PFN */ |
317 | end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages; |
318 | |
319 | if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) && |
320 | (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) { |
321 | void *ptr; |
322 | unsigned long new_goal; |
323 | |
324 | new_goal = MAX_DMA32_PFN << PAGE_SHIFT; |
325 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, |
326 | new_goal, -1ULL); |
327 | if (ptr) |
328 | return ptr; |
329 | } |
330 | #endif |
331 | |
332 | return __alloc_bootmem_node(pgdat, size, align, goal); |
333 | |
334 | } |
335 | |
336 | #ifdef CONFIG_SPARSEMEM |
337 | /** |
338 | * alloc_bootmem_section - allocate boot memory from a specific section |
339 | * @size: size of the request in bytes |
340 | * @section_nr: sparse map section to allocate from |
341 | * |
342 | * Return NULL on failure. |
343 | */ |
344 | void * __init alloc_bootmem_section(unsigned long size, |
345 | unsigned long section_nr) |
346 | { |
347 | unsigned long pfn, goal, limit; |
348 | |
349 | pfn = section_nr_to_pfn(section_nr); |
350 | goal = pfn << PAGE_SHIFT; |
351 | limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT; |
352 | |
353 | return __alloc_memory_core_early(early_pfn_to_nid(pfn), size, |
354 | SMP_CACHE_BYTES, goal, limit); |
355 | } |
356 | #endif |
357 | |
358 | void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, |
359 | unsigned long align, unsigned long goal) |
360 | { |
361 | void *ptr; |
362 | |
363 | if (WARN_ON_ONCE(slab_is_available())) |
364 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
365 | |
366 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, |
367 | goal, -1ULL); |
368 | if (ptr) |
369 | return ptr; |
370 | |
371 | return __alloc_bootmem_nopanic(size, align, goal); |
372 | } |
373 | |
374 | #ifndef ARCH_LOW_ADDRESS_LIMIT |
375 | #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL |
376 | #endif |
377 | |
378 | /** |
379 | * __alloc_bootmem_low - allocate low boot memory |
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 happen on any node in the system. |
388 | * |
389 | * The function panics if the request can not be satisfied. |
390 | */ |
391 | void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, |
392 | unsigned long goal) |
393 | { |
394 | return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); |
395 | } |
396 | |
397 | /** |
398 | * __alloc_bootmem_low_node - allocate low boot memory from a specific node |
399 | * @pgdat: node to allocate from |
400 | * @size: size of the request in bytes |
401 | * @align: alignment of the region |
402 | * @goal: preferred starting address of the region |
403 | * |
404 | * The goal is dropped if it can not be satisfied and the allocation will |
405 | * fall back to memory below @goal. |
406 | * |
407 | * Allocation may fall back to any node in the system if the specified node |
408 | * can not hold the requested memory. |
409 | * |
410 | * The function panics if the request can not be satisfied. |
411 | */ |
412 | void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, |
413 | unsigned long align, unsigned long goal) |
414 | { |
415 | void *ptr; |
416 | |
417 | if (WARN_ON_ONCE(slab_is_available())) |
418 | return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
419 | |
420 | ptr = __alloc_memory_core_early(pgdat->node_id, size, align, |
421 | goal, ARCH_LOW_ADDRESS_LIMIT); |
422 | if (ptr) |
423 | return ptr; |
424 | |
425 | return __alloc_memory_core_early(MAX_NUMNODES, size, align, |
426 | goal, ARCH_LOW_ADDRESS_LIMIT); |
427 | } |
428 |
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