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 ptr = phys_to_virt(addr);
50 memblock_reserve(addr, size);
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)
85 unsigned long i, start_aligned, end_aligned;
86 int order = ilog2(BITS_PER_LONG);
88 start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
89 end_aligned = end & ~(BITS_PER_LONG - 1);
91 if (end_aligned <= start_aligned) {
92 for (i = start; i < end; i++)
93 __free_pages_bootmem(pfn_to_page(i), 0);
98 for (i = start; i < start_aligned; i++)
99 __free_pages_bootmem(pfn_to_page(i), 0);
101 for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
102 __free_pages_bootmem(pfn_to_page(i), order);
104 for (i = end_aligned; i < end; i++)
105 __free_pages_bootmem(pfn_to_page(i), 0);
108 static unsigned long __init __free_memory_core(phys_addr_t start,
111 unsigned long start_pfn = PFN_UP(start);
112 unsigned long end_pfn = min_t(unsigned long,
113 PFN_DOWN(end), max_low_pfn);
115 if (start_pfn > end_pfn)
118 __free_pages_memory(start_pfn, end_pfn);
120 return end_pfn - start_pfn;
123 unsigned long __init free_low_memory_core_early(int nodeid)
125 unsigned long count = 0;
126 phys_addr_t start, end, size;
129 for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL)
130 count += __free_memory_core(start, end);
132 /* free range that is used for reserved array if we allocate it */
133 size = get_allocated_memblock_reserved_regions_info(&start);
135 count += __free_memory_core(start, start + size);
141 * free_all_bootmem_node - release a node's free pages to the buddy allocator
142 * @pgdat: node to be released
144 * Returns the number of pages actually released.
146 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
148 register_page_bootmem_info_node(pgdat);
150 /* free_low_memory_core_early(MAX_NUMNODES) will be called later */
155 * free_all_bootmem - release free pages to the buddy allocator
157 * Returns the number of pages actually released.
159 unsigned long __init free_all_bootmem(void)
162 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
163 * because in some case like Node0 doesn't have RAM installed
164 * low ram will be on Node1
165 * Use MAX_NUMNODES will make sure all ranges in early_node_map[]
166 * will be used instead of only Node0 related
168 return free_low_memory_core_early(MAX_NUMNODES);
172 * free_bootmem_node - mark a page range as usable
173 * @pgdat: node the range resides on
174 * @physaddr: starting address of the range
175 * @size: size of the range in bytes
177 * Partial pages will be considered reserved and left as they are.
179 * The range must reside completely on the specified node.
181 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
184 kmemleak_free_part(__va(physaddr), size);
185 memblock_free(physaddr, size);
189 * free_bootmem - mark a page range as usable
190 * @addr: starting address of the range
191 * @size: size of the range in bytes
193 * Partial pages will be considered reserved and left as they are.
195 * The range must be contiguous but may span node boundaries.
197 void __init free_bootmem(unsigned long addr, unsigned long size)
199 kmemleak_free_part(__va(addr), size);
200 memblock_free(addr, size);
203 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
210 if (WARN_ON_ONCE(slab_is_available()))
211 return kzalloc(size, GFP_NOWAIT);
215 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
229 * __alloc_bootmem_nopanic - allocate boot memory without panicking
230 * @size: size of the request in bytes
231 * @align: alignment of the region
232 * @goal: preferred starting address of the region
234 * The goal is dropped if it can not be satisfied and the allocation will
235 * fall back to memory below @goal.
237 * Allocation may happen on any node in the system.
239 * Returns NULL on failure.
241 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
244 unsigned long limit = -1UL;
246 return ___alloc_bootmem_nopanic(size, align, goal, limit);
249 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
250 unsigned long goal, unsigned long limit)
252 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
257 * Whoops, we cannot satisfy the allocation request.
259 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
260 panic("Out of memory");
265 * __alloc_bootmem - allocate boot memory
266 * @size: size of the request in bytes
267 * @align: alignment of the region
268 * @goal: preferred starting address of the region
270 * The goal is dropped if it can not be satisfied and the allocation will
271 * fall back to memory below @goal.
273 * Allocation may happen on any node in the system.
275 * The function panics if the request can not be satisfied.
277 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
280 unsigned long limit = -1UL;
282 return ___alloc_bootmem(size, align, goal, limit);
285 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
294 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
299 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
312 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
313 unsigned long align, unsigned long goal)
315 if (WARN_ON_ONCE(slab_is_available()))
316 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
318 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
321 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
322 unsigned long align, unsigned long goal,
327 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
331 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
332 panic("Out of memory");
337 * __alloc_bootmem_node - allocate boot memory from a specific node
338 * @pgdat: node to allocate from
339 * @size: size of the request in bytes
340 * @align: alignment of the region
341 * @goal: preferred starting address of the region
343 * The goal is dropped if it can not be satisfied and the allocation will
344 * fall back to memory below @goal.
346 * Allocation may fall back to any node in the system if the specified node
347 * can not hold the requested memory.
349 * The function panics if the request can not be satisfied.
351 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
352 unsigned long align, unsigned long goal)
354 if (WARN_ON_ONCE(slab_is_available()))
355 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
357 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
360 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
361 unsigned long align, unsigned long goal)
363 return __alloc_bootmem_node(pgdat, size, align, goal);
366 #ifndef ARCH_LOW_ADDRESS_LIMIT
367 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
371 * __alloc_bootmem_low - allocate low boot memory
372 * @size: size of the request in bytes
373 * @align: alignment of the region
374 * @goal: preferred starting address of the region
376 * The goal is dropped if it can not be satisfied and the allocation will
377 * fall back to memory below @goal.
379 * Allocation may happen on any node in the system.
381 * The function panics if the request can not be satisfied.
383 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
386 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
390 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
391 * @pgdat: node to allocate from
392 * @size: size of the request in bytes
393 * @align: alignment of the region
394 * @goal: preferred starting address of the region
396 * The goal is dropped if it can not be satisfied and the allocation will
397 * fall back to memory below @goal.
399 * Allocation may fall back to any node in the system if the specified node
400 * can not hold the requested memory.
402 * The function panics if the request can not be satisfied.
404 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
405 unsigned long align, unsigned long goal)
407 if (WARN_ON_ONCE(slab_is_available()))
408 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
410 return ___alloc_bootmem_node(pgdat, size, align, goal,
411 ARCH_LOW_ADDRESS_LIMIT);