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)
86 unsigned long start_aligned, end_aligned;
87 int order = ilog2(BITS_PER_LONG);
89 start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
90 end_aligned = end & ~(BITS_PER_LONG - 1);
92 if (end_aligned <= start_aligned) {
93 for (i = start; i < end; i++)
94 __free_pages_bootmem(pfn_to_page(i), 0);
99 for (i = start; i < start_aligned; i++)
100 __free_pages_bootmem(pfn_to_page(i), 0);
102 for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
103 __free_pages_bootmem(pfn_to_page(i), order);
105 for (i = end_aligned; i < end; i++)
106 __free_pages_bootmem(pfn_to_page(i), 0);
109 unsigned long __init free_low_memory_core_early(int nodeid)
111 unsigned long count = 0;
112 phys_addr_t start, end;
115 /* free reserved array temporarily so that it's treated as free area */
116 memblock_free_reserved_regions();
118 for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) {
119 unsigned long start_pfn = PFN_UP(start);
120 unsigned long end_pfn = min_t(unsigned long,
121 PFN_DOWN(end), max_low_pfn);
122 if (start_pfn < end_pfn) {
123 __free_pages_memory(start_pfn, end_pfn);
124 count += end_pfn - start_pfn;
128 /* put region array back? */
129 memblock_reserve_reserved_regions();
134 * free_all_bootmem_node - release a node's free pages to the buddy allocator
135 * @pgdat: node to be released
137 * Returns the number of pages actually released.
139 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
141 register_page_bootmem_info_node(pgdat);
143 /* free_low_memory_core_early(MAX_NUMNODES) will be called later */
148 * free_all_bootmem - release free pages to the buddy allocator
150 * Returns the number of pages actually released.
152 unsigned long __init free_all_bootmem(void)
155 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
156 * because in some case like Node0 doesn't have RAM installed
157 * low ram will be on Node1
158 * Use MAX_NUMNODES will make sure all ranges in early_node_map[]
159 * will be used instead of only Node0 related
161 return free_low_memory_core_early(MAX_NUMNODES);
165 * free_bootmem_node - mark a page range as usable
166 * @pgdat: node the range resides on
167 * @physaddr: starting address of the range
168 * @size: size of the range in bytes
170 * Partial pages will be considered reserved and left as they are.
172 * The range must reside completely on the specified node.
174 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
177 kmemleak_free_part(__va(physaddr), size);
178 memblock_free(physaddr, size);
182 * free_bootmem - mark a page range as usable
183 * @addr: starting address of the range
184 * @size: size of the range in bytes
186 * Partial pages will be considered reserved and left as they are.
188 * The range must be contiguous but may span node boundaries.
190 void __init free_bootmem(unsigned long addr, unsigned long size)
192 kmemleak_free_part(__va(addr), size);
193 memblock_free(addr, size);
196 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
203 if (WARN_ON_ONCE(slab_is_available()))
204 return kzalloc(size, GFP_NOWAIT);
208 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
222 * __alloc_bootmem_nopanic - allocate boot memory without panicking
223 * @size: size of the request in bytes
224 * @align: alignment of the region
225 * @goal: preferred starting address of the region
227 * The goal is dropped if it can not be satisfied and the allocation will
228 * fall back to memory below @goal.
230 * Allocation may happen on any node in the system.
232 * Returns NULL on failure.
234 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
237 unsigned long limit = -1UL;
239 return ___alloc_bootmem_nopanic(size, align, goal, limit);
242 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
243 unsigned long goal, unsigned long limit)
245 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
250 * Whoops, we cannot satisfy the allocation request.
252 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
253 panic("Out of memory");
258 * __alloc_bootmem - allocate boot memory
259 * @size: size of the request in bytes
260 * @align: alignment of the region
261 * @goal: preferred starting address of the region
263 * The goal is dropped if it can not be satisfied and the allocation will
264 * fall back to memory below @goal.
266 * Allocation may happen on any node in the system.
268 * The function panics if the request can not be satisfied.
270 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
273 unsigned long limit = -1UL;
275 return ___alloc_bootmem(size, align, goal, limit);
279 * __alloc_bootmem_node - allocate boot memory from a specific node
280 * @pgdat: node to allocate from
281 * @size: size of the request in bytes
282 * @align: alignment of the region
283 * @goal: preferred starting address of the region
285 * The goal is dropped if it can not be satisfied and the allocation will
286 * fall back to memory below @goal.
288 * Allocation may fall back to any node in the system if the specified node
289 * can not hold the requested memory.
291 * The function panics if the request can not be satisfied.
293 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
294 unsigned long align, unsigned long goal)
298 if (WARN_ON_ONCE(slab_is_available()))
299 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
301 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
306 return __alloc_memory_core_early(MAX_NUMNODES, size, align,
310 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
311 unsigned long align, unsigned long goal)
313 return __alloc_bootmem_node(pgdat, size, align, goal);
316 #ifdef CONFIG_SPARSEMEM
318 * alloc_bootmem_section - allocate boot memory from a specific section
319 * @size: size of the request in bytes
320 * @section_nr: sparse map section to allocate from
322 * Return NULL on failure.
324 void * __init alloc_bootmem_section(unsigned long size,
325 unsigned long section_nr)
327 unsigned long pfn, goal, limit;
329 pfn = section_nr_to_pfn(section_nr);
330 goal = pfn << PAGE_SHIFT;
331 limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
333 return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
334 SMP_CACHE_BYTES, goal, limit);
338 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
339 unsigned long align, unsigned long goal)
343 if (WARN_ON_ONCE(slab_is_available()))
344 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
346 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
351 return __alloc_bootmem_nopanic(size, align, goal);
354 #ifndef ARCH_LOW_ADDRESS_LIMIT
355 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
359 * __alloc_bootmem_low - allocate low boot memory
360 * @size: size of the request in bytes
361 * @align: alignment of the region
362 * @goal: preferred starting address of the region
364 * The goal is dropped if it can not be satisfied and the allocation will
365 * fall back to memory below @goal.
367 * Allocation may happen on any node in the system.
369 * The function panics if the request can not be satisfied.
371 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
374 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
378 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
379 * @pgdat: node to allocate from
380 * @size: size of the request in bytes
381 * @align: alignment of the region
382 * @goal: preferred starting address of the region
384 * The goal is dropped if it can not be satisfied and the allocation will
385 * fall back to memory below @goal.
387 * Allocation may fall back to any node in the system if the specified node
388 * can not hold the requested memory.
390 * The function panics if the request can not be satisfied.
392 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
393 unsigned long align, unsigned long goal)
397 if (WARN_ON_ONCE(slab_is_available()))
398 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
400 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
401 goal, ARCH_LOW_ADDRESS_LIMIT);
405 return __alloc_memory_core_early(MAX_NUMNODES, size, align,
406 goal, ARCH_LOW_ADDRESS_LIMIT);