2 * bootmem - A boot-time physical memory allocator and configurator
4 * Copyright (C) 1999 Ingo Molnar
5 * 1999 Kanoj Sarcar, SGI
8 * Access to this subsystem has to be serialized externally (which is true
9 * for the boot process anyway).
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>
22 #include <asm/processor.h>
26 #ifndef CONFIG_NEED_MULTIPLE_NODES
27 struct pglist_data __refdata contig_page_data;
28 EXPORT_SYMBOL(contig_page_data);
31 unsigned long max_low_pfn;
32 unsigned long min_low_pfn;
33 unsigned long max_pfn;
35 static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
41 if (limit > memblock.current_limit)
42 limit = memblock.current_limit;
44 addr = memblock_find_in_range_node(goal, limit, size, align, nid);
48 memblock_reserve(addr, size);
49 ptr = phys_to_virt(addr);
52 * The min_count is set to 0 so that bootmem allocated blocks
53 * are never reported as leaks.
55 kmemleak_alloc(ptr, size, 0, 0);
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
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.
68 void __init free_bootmem_late(unsigned long addr, unsigned long size)
70 unsigned long cursor, end;
72 kmemleak_free_part(__va(addr), size);
74 cursor = PFN_UP(addr);
75 end = PFN_DOWN(addr + size);
77 for (; cursor < end; cursor++) {
78 __free_pages_bootmem(pfn_to_page(cursor), 0);
83 static void __init __free_pages_memory(unsigned long start, unsigned long end)
88 order = min(MAX_ORDER - 1UL, __ffs(start));
90 while (start + (1UL << order) > end)
93 __free_pages_bootmem(pfn_to_page(start), order);
95 start += (1UL << order);
99 static unsigned long __init __free_memory_core(phys_addr_t start,
102 unsigned long start_pfn = PFN_UP(start);
103 unsigned long end_pfn = min_t(unsigned long,
104 PFN_DOWN(end), max_low_pfn);
106 if (start_pfn > end_pfn)
109 __free_pages_memory(start_pfn, end_pfn);
111 return end_pfn - start_pfn;
114 static unsigned long __init free_low_memory_core_early(void)
116 unsigned long count = 0;
117 phys_addr_t start, end, size;
120 for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL)
121 count += __free_memory_core(start, end);
123 /* free range that is used for reserved array if we allocate it */
124 size = get_allocated_memblock_reserved_regions_info(&start);
126 count += __free_memory_core(start, start + size);
131 static int reset_managed_pages_done __initdata;
133 static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
137 if (reset_managed_pages_done)
139 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
140 z->managed_pages = 0;
143 void __init reset_all_zones_managed_pages(void)
145 struct pglist_data *pgdat;
147 for_each_online_pgdat(pgdat)
148 reset_node_managed_pages(pgdat);
149 reset_managed_pages_done = 1;
153 * free_all_bootmem - release free pages to the buddy allocator
155 * Returns the number of pages actually released.
157 unsigned long __init free_all_bootmem(void)
161 reset_all_zones_managed_pages();
164 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
165 * because in some case like Node0 doesn't have RAM installed
166 * low ram will be on Node1
168 pages = free_low_memory_core_early();
169 totalram_pages += pages;
175 * free_bootmem_node - mark a page range as usable
176 * @pgdat: node the range resides on
177 * @physaddr: starting address of the range
178 * @size: size of the range in bytes
180 * Partial pages will be considered reserved and left as they are.
182 * The range must reside completely on the specified node.
184 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
187 kmemleak_free_part(__va(physaddr), size);
188 memblock_free(physaddr, size);
192 * free_bootmem - mark a page range as usable
193 * @addr: starting address of the range
194 * @size: size of the range in bytes
196 * Partial pages will be considered reserved and left as they are.
198 * The range must be contiguous but may span node boundaries.
200 void __init free_bootmem(unsigned long addr, unsigned long size)
202 kmemleak_free_part(__va(addr), size);
203 memblock_free(addr, size);
206 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
213 if (WARN_ON_ONCE(slab_is_available()))
214 return kzalloc(size, GFP_NOWAIT);
218 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
232 * __alloc_bootmem_nopanic - allocate boot memory without panicking
233 * @size: size of the request in bytes
234 * @align: alignment of the region
235 * @goal: preferred starting address of the region
237 * The goal is dropped if it can not be satisfied and the allocation will
238 * fall back to memory below @goal.
240 * Allocation may happen on any node in the system.
242 * Returns NULL on failure.
244 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
247 unsigned long limit = -1UL;
249 return ___alloc_bootmem_nopanic(size, align, goal, limit);
252 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
253 unsigned long goal, unsigned long limit)
255 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
260 * Whoops, we cannot satisfy the allocation request.
262 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
263 panic("Out of memory");
268 * __alloc_bootmem - allocate boot memory
269 * @size: size of the request in bytes
270 * @align: alignment of the region
271 * @goal: preferred starting address of the region
273 * The goal is dropped if it can not be satisfied and the allocation will
274 * fall back to memory below @goal.
276 * Allocation may happen on any node in the system.
278 * The function panics if the request can not be satisfied.
280 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
283 unsigned long limit = -1UL;
285 return ___alloc_bootmem(size, align, goal, limit);
288 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
297 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
302 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
315 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
316 unsigned long align, unsigned long goal)
318 if (WARN_ON_ONCE(slab_is_available()))
319 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
321 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
324 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
325 unsigned long align, unsigned long goal,
330 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
334 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
335 panic("Out of memory");
340 * __alloc_bootmem_node - allocate boot memory from a specific node
341 * @pgdat: node to allocate from
342 * @size: size of the request in bytes
343 * @align: alignment of the region
344 * @goal: preferred starting address of the region
346 * The goal is dropped if it can not be satisfied and the allocation will
347 * fall back to memory below @goal.
349 * Allocation may fall back to any node in the system if the specified node
350 * can not hold the requested memory.
352 * The function panics if the request can not be satisfied.
354 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
355 unsigned long align, unsigned long goal)
357 if (WARN_ON_ONCE(slab_is_available()))
358 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
360 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
363 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
364 unsigned long align, unsigned long goal)
366 return __alloc_bootmem_node(pgdat, size, align, goal);
369 #ifndef ARCH_LOW_ADDRESS_LIMIT
370 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
374 * __alloc_bootmem_low - allocate low boot memory
375 * @size: size of the request in bytes
376 * @align: alignment of the region
377 * @goal: preferred starting address of the region
379 * The goal is dropped if it can not be satisfied and the allocation will
380 * fall back to memory below @goal.
382 * Allocation may happen on any node in the system.
384 * The function panics if the request can not be satisfied.
386 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
389 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
392 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
396 return ___alloc_bootmem_nopanic(size, align, goal,
397 ARCH_LOW_ADDRESS_LIMIT);
401 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
402 * @pgdat: node to allocate from
403 * @size: size of the request in bytes
404 * @align: alignment of the region
405 * @goal: preferred starting address of the region
407 * The goal is dropped if it can not be satisfied and the allocation will
408 * fall back to memory below @goal.
410 * Allocation may fall back to any node in the system if the specified node
411 * can not hold the requested memory.
413 * The function panics if the request can not be satisfied.
415 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
416 unsigned long align, unsigned long goal)
418 if (WARN_ON_ONCE(slab_is_available()))
419 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
421 return ___alloc_bootmem_node(pgdat, size, align, goal,
422 ARCH_LOW_ADDRESS_LIMIT);