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09325873
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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>
b95f1b31 15#include <linux/export.h>
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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
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26#ifndef CONFIG_NEED_MULTIPLE_NODES
27struct pglist_data __refdata contig_page_data;
28EXPORT_SYMBOL(contig_page_data);
29#endif
30
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31unsigned long max_low_pfn;
32unsigned long min_low_pfn;
33unsigned long max_pfn;
34
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35static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
36 u64 goal, u64 limit)
37{
38 void *ptr;
39 u64 addr;
a3f5bafc 40 ulong flags = choose_memblock_flags();
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41
42 if (limit > memblock.current_limit)
43 limit = memblock.current_limit;
44
a3f5bafc 45again:
fc6daaf9 46 addr = memblock_find_in_range_node(size, align, goal, limit, nid,
a3f5bafc
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47 flags);
48 if (!addr && (flags & MEMBLOCK_MIRROR)) {
49 flags &= ~MEMBLOCK_MIRROR;
50 pr_warn("Could not allocate %pap bytes of mirrored memory\n",
51 &size);
52 goto again;
53 }
1f5026a7 54 if (!addr)
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55 return NULL;
56
87379ec8
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57 if (memblock_reserve(addr, size))
58 return NULL;
59
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60 ptr = phys_to_virt(addr);
61 memset(ptr, 0, size);
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62 /*
63 * The min_count is set to 0 so that bootmem allocated blocks
64 * are never reported as leaks.
65 */
66 kmemleak_alloc(ptr, size, 0, 0);
67 return ptr;
68}
69
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70/*
71 * free_bootmem_late - free bootmem pages directly to page allocator
72 * @addr: starting address of the range
73 * @size: size of the range in bytes
74 *
75 * This is only useful when the bootmem allocator has already been torn
76 * down, but we are still initializing the system. Pages are given directly
77 * to the page allocator, no bootmem metadata is updated because it is gone.
78 */
79void __init free_bootmem_late(unsigned long addr, unsigned long size)
80{
81 unsigned long cursor, end;
82
83 kmemleak_free_part(__va(addr), size);
84
85 cursor = PFN_UP(addr);
86 end = PFN_DOWN(addr + size);
87
88 for (; cursor < end; cursor++) {
d70ddd7a 89 __free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
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90 totalram_pages++;
91 }
92}
93
94static void __init __free_pages_memory(unsigned long start, unsigned long end)
95{
309d0b39 96 int order;
09325873 97
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98 while (start < end) {
99 order = min(MAX_ORDER - 1UL, __ffs(start));
09325873 100
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101 while (start + (1UL << order) > end)
102 order--;
09325873 103
d70ddd7a 104 __free_pages_bootmem(pfn_to_page(start), start, order);
09325873 105
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106 start += (1UL << order);
107 }
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108}
109
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110static unsigned long __init __free_memory_core(phys_addr_t start,
111 phys_addr_t end)
112{
113 unsigned long start_pfn = PFN_UP(start);
114 unsigned long end_pfn = min_t(unsigned long,
115 PFN_DOWN(end), max_low_pfn);
116
117 if (start_pfn > end_pfn)
118 return 0;
119
120 __free_pages_memory(start_pfn, end_pfn);
121
122 return end_pfn - start_pfn;
123}
124
b4def350 125static unsigned long __init free_low_memory_core_early(void)
09325873 126{
09325873 127 unsigned long count = 0;
354f17e1 128 phys_addr_t start, end;
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129 u64 i;
130
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131 memblock_clear_hotplug(0, -1);
132
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133 for_each_reserved_mem_region(i, &start, &end)
134 reserve_bootmem_region(start, end);
135
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136 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
137 NULL)
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138 count += __free_memory_core(start, end);
139
5e270e25 140#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
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141 {
142 phys_addr_t size;
143
144 /* Free memblock.reserved array if it was allocated */
145 size = get_allocated_memblock_reserved_regions_info(&start);
146 if (size)
147 count += __free_memory_core(start, start + size);
148
149 /* Free memblock.memory array if it was allocated */
150 size = get_allocated_memblock_memory_regions_info(&start);
151 if (size)
152 count += __free_memory_core(start, start + size);
153 }
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154#endif
155
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156 return count;
157}
158
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159static int reset_managed_pages_done __initdata;
160
f784a3f1 161void reset_node_managed_pages(pg_data_t *pgdat)
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162{
163 struct zone *z;
164
9feedc9d 165 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
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166 z->managed_pages = 0;
167}
168
169void __init reset_all_zones_managed_pages(void)
170{
171 struct pglist_data *pgdat;
172
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173 if (reset_managed_pages_done)
174 return;
175
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176 for_each_online_pgdat(pgdat)
177 reset_node_managed_pages(pgdat);
f784a3f1 178
7b4b2a0d 179 reset_managed_pages_done = 1;
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180}
181
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182/**
183 * free_all_bootmem - release free pages to the buddy allocator
184 *
185 * Returns the number of pages actually released.
186 */
187unsigned long __init free_all_bootmem(void)
188{
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189 unsigned long pages;
190
7b4b2a0d 191 reset_all_zones_managed_pages();
9feedc9d 192
09325873 193 /*
b1154233 194 * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
25985edc 195 * because in some case like Node0 doesn't have RAM installed
09325873 196 * low ram will be on Node1
09325873 197 */
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198 pages = free_low_memory_core_early();
199 totalram_pages += pages;
200
201 return pages;
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202}
203
204/**
205 * free_bootmem_node - mark a page range as usable
206 * @pgdat: node the range resides on
207 * @physaddr: starting address of the range
208 * @size: size of the range in bytes
209 *
210 * Partial pages will be considered reserved and left as they are.
211 *
212 * The range must reside completely on the specified node.
213 */
214void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
215 unsigned long size)
216{
24aa0788 217 memblock_free(physaddr, size);
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218}
219
220/**
221 * free_bootmem - mark a page range as usable
222 * @addr: starting address of the range
223 * @size: size of the range in bytes
224 *
225 * Partial pages will be considered reserved and left as they are.
226 *
227 * The range must be contiguous but may span node boundaries.
228 */
229void __init free_bootmem(unsigned long addr, unsigned long size)
230{
24aa0788 231 memblock_free(addr, size);
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232}
233
234static void * __init ___alloc_bootmem_nopanic(unsigned long size,
235 unsigned long align,
236 unsigned long goal,
237 unsigned long limit)
238{
239 void *ptr;
240
241 if (WARN_ON_ONCE(slab_is_available()))
242 return kzalloc(size, GFP_NOWAIT);
243
244restart:
245
b1154233 246 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
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247
248 if (ptr)
249 return ptr;
250
251 if (goal != 0) {
252 goal = 0;
253 goto restart;
254 }
255
256 return NULL;
257}
258
259/**
260 * __alloc_bootmem_nopanic - allocate boot memory without panicking
261 * @size: size of the request in bytes
262 * @align: alignment of the region
263 * @goal: preferred starting address of the region
264 *
265 * The goal is dropped if it can not be satisfied and the allocation will
266 * fall back to memory below @goal.
267 *
268 * Allocation may happen on any node in the system.
269 *
270 * Returns NULL on failure.
271 */
272void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
273 unsigned long goal)
274{
275 unsigned long limit = -1UL;
276
277 return ___alloc_bootmem_nopanic(size, align, goal, limit);
278}
279
280static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
281 unsigned long goal, unsigned long limit)
282{
283 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
284
285 if (mem)
286 return mem;
287 /*
288 * Whoops, we cannot satisfy the allocation request.
289 */
290 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
291 panic("Out of memory");
292 return NULL;
293}
294
295/**
296 * __alloc_bootmem - allocate boot memory
297 * @size: size of the request in bytes
298 * @align: alignment of the region
299 * @goal: preferred starting address of the region
300 *
301 * The goal is dropped if it can not be satisfied and the allocation will
302 * fall back to memory below @goal.
303 *
304 * Allocation may happen on any node in the system.
305 *
306 * The function panics if the request can not be satisfied.
307 */
308void * __init __alloc_bootmem(unsigned long size, unsigned long align,
309 unsigned long goal)
310{
311 unsigned long limit = -1UL;
312
313 return ___alloc_bootmem(size, align, goal, limit);
314}
315
99ab7b19 316void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
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317 unsigned long size,
318 unsigned long align,
319 unsigned long goal,
320 unsigned long limit)
321{
322 void *ptr;
323
324again:
325 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
326 goal, limit);
327 if (ptr)
328 return ptr;
329
b1154233 330 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
ba539868
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331 goal, limit);
332 if (ptr)
333 return ptr;
334
335 if (goal) {
336 goal = 0;
337 goto again;
338 }
339
340 return NULL;
341}
342
343void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
344 unsigned long align, unsigned long goal)
345{
346 if (WARN_ON_ONCE(slab_is_available()))
347 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
348
349 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
350}
351
de498507 352static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
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353 unsigned long align, unsigned long goal,
354 unsigned long limit)
355{
356 void *ptr;
357
358 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
359 if (ptr)
360 return ptr;
361
362 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
363 panic("Out of memory");
364 return NULL;
365}
366
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367/**
368 * __alloc_bootmem_node - allocate boot memory from a specific node
369 * @pgdat: node to allocate from
370 * @size: size of the request in bytes
371 * @align: alignment of the region
372 * @goal: preferred starting address of the region
373 *
374 * The goal is dropped if it can not be satisfied and the allocation will
375 * fall back to memory below @goal.
376 *
377 * Allocation may fall back to any node in the system if the specified node
378 * can not hold the requested memory.
379 *
380 * The function panics if the request can not be satisfied.
381 */
382void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
383 unsigned long align, unsigned long goal)
384{
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385 if (WARN_ON_ONCE(slab_is_available()))
386 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
387
ba539868 388 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
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389}
390
391void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
392 unsigned long align, unsigned long goal)
393{
09325873 394 return __alloc_bootmem_node(pgdat, size, align, goal);
09325873
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395}
396
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397#ifndef ARCH_LOW_ADDRESS_LIMIT
398#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
399#endif
400
401/**
402 * __alloc_bootmem_low - allocate low boot memory
403 * @size: size of the request in bytes
404 * @align: alignment of the region
405 * @goal: preferred starting address of the region
406 *
407 * The goal is dropped if it can not be satisfied and the allocation will
408 * fall back to memory below @goal.
409 *
410 * Allocation may happen on any node in the system.
411 *
412 * The function panics if the request can not be satisfied.
413 */
414void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
415 unsigned long goal)
416{
417 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
418}
419
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420void * __init __alloc_bootmem_low_nopanic(unsigned long size,
421 unsigned long align,
422 unsigned long goal)
423{
424 return ___alloc_bootmem_nopanic(size, align, goal,
425 ARCH_LOW_ADDRESS_LIMIT);
426}
427
09325873
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428/**
429 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
430 * @pgdat: node to allocate from
431 * @size: size of the request in bytes
432 * @align: alignment of the region
433 * @goal: preferred starting address of the region
434 *
435 * The goal is dropped if it can not be satisfied and the allocation will
436 * fall back to memory below @goal.
437 *
438 * Allocation may fall back to any node in the system if the specified node
439 * can not hold the requested memory.
440 *
441 * The function panics if the request can not be satisfied.
442 */
443void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
444 unsigned long align, unsigned long goal)
445{
09325873
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446 if (WARN_ON_ONCE(slab_is_available()))
447 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
448
ba539868
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449 return ___alloc_bootmem_node(pgdat, size, align, goal,
450 ARCH_LOW_ADDRESS_LIMIT);
09325873 451}