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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>
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
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
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
Yinghai Lu09325872011-02-24 14:43:05 +010060/*
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 */
69void __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
84static 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
110unsigned 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 */
136unsigned 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 */
149unsigned long __init free_all_bootmem(void)
150{
151 /*
152 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300153 * because in some case like Node0 doesn't have RAM installed
Yinghai Lu09325872011-02-24 14:43:05 +0100154 * 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 */
171void __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 */
187void __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
193static 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
203restart:
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 */
231void * __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
239static 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 */
267void * __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 */
290void * __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
307void * __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 */
344void * __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
358void * __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 */
391void * __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 */
412void * __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}