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Yinghai Lu09325872011-02-24 14:43:05 +01001/*
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>
Paul Gortmakerb95f1b312011-10-16 02:01:52 -040015#include <linux/export.h>
Yinghai Lu09325872011-02-24 14:43:05 +010016#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
Yinghai Lue782ab42011-02-24 14:43:06 +010026#ifndef CONFIG_NEED_MULTIPLE_NODES
27struct pglist_data __refdata contig_page_data;
28EXPORT_SYMBOL(contig_page_data);
29#endif
30
Yinghai Lu09325872011-02-24 14:43:05 +010031unsigned long max_low_pfn;
32unsigned long min_low_pfn;
33unsigned long max_pfn;
34
Yinghai Lu8bc1f912011-02-24 14:43:06 +010035static 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
Tejun Heoeb40c4c2011-07-12 10:46:35 +020044 addr = memblock_find_in_range_node(goal, limit, size, align, nid);
Tejun Heo1f5026a2011-07-12 09:58:09 +020045 if (!addr)
Yinghai Lu8bc1f912011-02-24 14:43:06 +010046 return NULL;
47
Joonsoo Kimb476e292013-04-29 15:08:53 -070048 memblock_reserve(addr, size);
Yinghai Lu8bc1f912011-02-24 14:43:06 +010049 ptr = phys_to_virt(addr);
50 memset(ptr, 0, size);
Yinghai Lu8bc1f912011-02-24 14:43:06 +010051 /*
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
Yinghai Lu09325872011-02-24 14:43:05 +010059/*
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 */
68void __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
83static void __init __free_pages_memory(unsigned long start, unsigned long end)
84{
Russ Anderson6bc2e852012-05-10 13:01:46 -070085 unsigned long i, start_aligned, end_aligned;
Yinghai Lu09325872011-02-24 14:43:05 +010086 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
Yinghai Lu29f67382012-07-11 14:02:56 -0700108static unsigned long __init __free_memory_core(phys_addr_t start,
109 phys_addr_t end)
110{
111 unsigned long start_pfn = PFN_UP(start);
112 unsigned long end_pfn = min_t(unsigned long,
113 PFN_DOWN(end), max_low_pfn);
114
115 if (start_pfn > end_pfn)
116 return 0;
117
118 __free_pages_memory(start_pfn, end_pfn);
119
120 return end_pfn - start_pfn;
121}
122
Joonsoo Kimb4def352013-04-29 15:08:52 -0700123static unsigned long __init free_low_memory_core_early(void)
Yinghai Lu09325872011-02-24 14:43:05 +0100124{
Yinghai Lu09325872011-02-24 14:43:05 +0100125 unsigned long count = 0;
Yinghai Lu29f67382012-07-11 14:02:56 -0700126 phys_addr_t start, end, size;
Tejun Heo8a9ca342011-07-12 11:16:02 +0200127 u64 i;
Yinghai Lu09325872011-02-24 14:43:05 +0100128
Yinghai Lu29f67382012-07-11 14:02:56 -0700129 for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL)
130 count += __free_memory_core(start, end);
Yinghai Lu09325872011-02-24 14:43:05 +0100131
Yinghai Lu29f67382012-07-11 14:02:56 -0700132 /* free range that is used for reserved array if we allocate it */
133 size = get_allocated_memblock_reserved_regions_info(&start);
134 if (size)
135 count += __free_memory_core(start, start + size);
Yinghai Lu09325872011-02-24 14:43:05 +0100136
137 return count;
138}
139
Jiang Liu9feedc92012-12-12 13:52:12 -0800140static void reset_node_lowmem_managed_pages(pg_data_t *pgdat)
141{
142 struct zone *z;
143
144 /*
145 * In free_area_init_core(), highmem zone's managed_pages is set to
146 * present_pages, and bootmem allocator doesn't allocate from highmem
147 * zones. So there's no need to recalculate managed_pages because all
148 * highmem pages will be managed by the buddy system. Here highmem
149 * zone also includes highmem movable zone.
150 */
151 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
152 if (!is_highmem(z))
153 z->managed_pages = 0;
154}
155
Yinghai Lu09325872011-02-24 14:43:05 +0100156/**
Yinghai Lu09325872011-02-24 14:43:05 +0100157 * free_all_bootmem - release free pages to the buddy allocator
158 *
159 * Returns the number of pages actually released.
160 */
161unsigned long __init free_all_bootmem(void)
162{
Jiang Liu9feedc92012-12-12 13:52:12 -0800163 struct pglist_data *pgdat;
164
165 for_each_online_pgdat(pgdat)
166 reset_node_lowmem_managed_pages(pgdat);
167
Yinghai Lu09325872011-02-24 14:43:05 +0100168 /*
169 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300170 * because in some case like Node0 doesn't have RAM installed
Yinghai Lu09325872011-02-24 14:43:05 +0100171 * low ram will be on Node1
Yinghai Lu09325872011-02-24 14:43:05 +0100172 */
Joonsoo Kimb4def352013-04-29 15:08:52 -0700173 return free_low_memory_core_early();
Yinghai Lu09325872011-02-24 14:43:05 +0100174}
175
176/**
177 * free_bootmem_node - mark a page range as usable
178 * @pgdat: node the range resides on
179 * @physaddr: 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 reside completely on the specified node.
185 */
186void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
187 unsigned long size)
188{
189 kmemleak_free_part(__va(physaddr), size);
Tejun Heo24aa0782011-07-12 11:16:06 +0200190 memblock_free(physaddr, size);
Yinghai Lu09325872011-02-24 14:43:05 +0100191}
192
193/**
194 * free_bootmem - mark a page range as usable
195 * @addr: starting address of the range
196 * @size: size of the range in bytes
197 *
198 * Partial pages will be considered reserved and left as they are.
199 *
200 * The range must be contiguous but may span node boundaries.
201 */
202void __init free_bootmem(unsigned long addr, unsigned long size)
203{
204 kmemleak_free_part(__va(addr), size);
Tejun Heo24aa0782011-07-12 11:16:06 +0200205 memblock_free(addr, size);
Yinghai Lu09325872011-02-24 14:43:05 +0100206}
207
208static void * __init ___alloc_bootmem_nopanic(unsigned long size,
209 unsigned long align,
210 unsigned long goal,
211 unsigned long limit)
212{
213 void *ptr;
214
215 if (WARN_ON_ONCE(slab_is_available()))
216 return kzalloc(size, GFP_NOWAIT);
217
218restart:
219
220 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
221
222 if (ptr)
223 return ptr;
224
225 if (goal != 0) {
226 goal = 0;
227 goto restart;
228 }
229
230 return NULL;
231}
232
233/**
234 * __alloc_bootmem_nopanic - allocate boot memory without panicking
235 * @size: size of the request in bytes
236 * @align: alignment of the region
237 * @goal: preferred starting address of the region
238 *
239 * The goal is dropped if it can not be satisfied and the allocation will
240 * fall back to memory below @goal.
241 *
242 * Allocation may happen on any node in the system.
243 *
244 * Returns NULL on failure.
245 */
246void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
247 unsigned long goal)
248{
249 unsigned long limit = -1UL;
250
251 return ___alloc_bootmem_nopanic(size, align, goal, limit);
252}
253
254static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
255 unsigned long goal, unsigned long limit)
256{
257 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
258
259 if (mem)
260 return mem;
261 /*
262 * Whoops, we cannot satisfy the allocation request.
263 */
264 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
265 panic("Out of memory");
266 return NULL;
267}
268
269/**
270 * __alloc_bootmem - allocate boot memory
271 * @size: size of the request in bytes
272 * @align: alignment of the region
273 * @goal: preferred starting address of the region
274 *
275 * The goal is dropped if it can not be satisfied and the allocation will
276 * fall back to memory below @goal.
277 *
278 * Allocation may happen on any node in the system.
279 *
280 * The function panics if the request can not be satisfied.
281 */
282void * __init __alloc_bootmem(unsigned long size, unsigned long align,
283 unsigned long goal)
284{
285 unsigned long limit = -1UL;
286
287 return ___alloc_bootmem(size, align, goal, limit);
288}
289
Yinghai Lu99ab7b12012-07-11 14:02:53 -0700290void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
Johannes Weinerba539862012-05-29 15:06:35 -0700291 unsigned long size,
292 unsigned long align,
293 unsigned long goal,
294 unsigned long limit)
295{
296 void *ptr;
297
298again:
299 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
300 goal, limit);
301 if (ptr)
302 return ptr;
303
304 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
305 goal, limit);
306 if (ptr)
307 return ptr;
308
309 if (goal) {
310 goal = 0;
311 goto again;
312 }
313
314 return NULL;
315}
316
317void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
318 unsigned long align, unsigned long goal)
319{
320 if (WARN_ON_ONCE(slab_is_available()))
321 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
322
323 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
324}
325
326void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
327 unsigned long align, unsigned long goal,
328 unsigned long limit)
329{
330 void *ptr;
331
332 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
333 if (ptr)
334 return ptr;
335
336 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
337 panic("Out of memory");
338 return NULL;
339}
340
Yinghai Lu09325872011-02-24 14:43:05 +0100341/**
342 * __alloc_bootmem_node - allocate boot memory from a specific node
343 * @pgdat: node to allocate from
344 * @size: size of the request in bytes
345 * @align: alignment of the region
346 * @goal: preferred starting address of the region
347 *
348 * The goal is dropped if it can not be satisfied and the allocation will
349 * fall back to memory below @goal.
350 *
351 * Allocation may fall back to any node in the system if the specified node
352 * can not hold the requested memory.
353 *
354 * The function panics if the request can not be satisfied.
355 */
356void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
357 unsigned long align, unsigned long goal)
358{
Yinghai Lu09325872011-02-24 14:43:05 +0100359 if (WARN_ON_ONCE(slab_is_available()))
360 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
361
Johannes Weinerba539862012-05-29 15:06:35 -0700362 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
Yinghai Lu09325872011-02-24 14:43:05 +0100363}
364
365void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
366 unsigned long align, unsigned long goal)
367{
Yinghai Lu09325872011-02-24 14:43:05 +0100368 return __alloc_bootmem_node(pgdat, size, align, goal);
Yinghai Lu09325872011-02-24 14:43:05 +0100369}
370
Yinghai Lu09325872011-02-24 14:43:05 +0100371#ifndef ARCH_LOW_ADDRESS_LIMIT
372#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
373#endif
374
375/**
376 * __alloc_bootmem_low - allocate low boot memory
377 * @size: size of the request in bytes
378 * @align: alignment of the region
379 * @goal: preferred starting address of the region
380 *
381 * The goal is dropped if it can not be satisfied and the allocation will
382 * fall back to memory below @goal.
383 *
384 * Allocation may happen on any node in the system.
385 *
386 * The function panics if the request can not be satisfied.
387 */
388void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
389 unsigned long goal)
390{
391 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
392}
393
Yinghai Lu38fa4172013-01-24 12:20:15 -0800394void * __init __alloc_bootmem_low_nopanic(unsigned long size,
395 unsigned long align,
396 unsigned long goal)
397{
398 return ___alloc_bootmem_nopanic(size, align, goal,
399 ARCH_LOW_ADDRESS_LIMIT);
400}
401
Yinghai Lu09325872011-02-24 14:43:05 +0100402/**
403 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
404 * @pgdat: node to allocate from
405 * @size: size of the request in bytes
406 * @align: alignment of the region
407 * @goal: preferred starting address of the region
408 *
409 * The goal is dropped if it can not be satisfied and the allocation will
410 * fall back to memory below @goal.
411 *
412 * Allocation may fall back to any node in the system if the specified node
413 * can not hold the requested memory.
414 *
415 * The function panics if the request can not be satisfied.
416 */
417void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
418 unsigned long align, unsigned long goal)
419{
Yinghai Lu09325872011-02-24 14:43:05 +0100420 if (WARN_ON_ONCE(slab_is_available()))
421 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
422
Johannes Weinerba539862012-05-29 15:06:35 -0700423 return ___alloc_bootmem_node(pgdat, size, align, goal,
424 ARCH_LOW_ADDRESS_LIMIT);
Yinghai Lu09325872011-02-24 14:43:05 +0100425}