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 unsigned long __init free_low_memory_core_early(int nodeid)
110 unsigned long count = 0;
111 phys_addr_t start, end;
114 /* free reserved array temporarily so that it's treated as free area */
115 memblock_free_reserved_regions();
117 for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) {
118 unsigned long start_pfn = PFN_UP(start);
119 unsigned long end_pfn = min_t(unsigned long,
120 PFN_DOWN(end), max_low_pfn);
121 if (start_pfn < end_pfn) {
122 __free_pages_memory(start_pfn, end_pfn);
123 count += end_pfn - start_pfn;
127 /* put region array back? */
128 memblock_reserve_reserved_regions();
133 * free_all_bootmem_node - release a node's free pages to the buddy allocator
134 * @pgdat: node to be released
136 * Returns the number of pages actually released.
138 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
140 register_page_bootmem_info_node(pgdat);
142 /* free_low_memory_core_early(MAX_NUMNODES) will be called later */
147 * free_all_bootmem - release free pages to the buddy allocator
149 * Returns the number of pages actually released.
151 unsigned long __init free_all_bootmem(void)
154 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
155 * because in some case like Node0 doesn't have RAM installed
156 * low ram will be on Node1
157 * Use MAX_NUMNODES will make sure all ranges in early_node_map[]
158 * will be used instead of only Node0 related
160 return free_low_memory_core_early(MAX_NUMNODES);
164 * free_bootmem_node - mark a page range as usable
165 * @pgdat: node the range resides on
166 * @physaddr: starting address of the range
167 * @size: size of the range in bytes
169 * Partial pages will be considered reserved and left as they are.
171 * The range must reside completely on the specified node.
173 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
176 kmemleak_free_part(__va(physaddr), size);
177 memblock_free(physaddr, size);
181 * free_bootmem - mark a page range as usable
182 * @addr: starting address of the range
183 * @size: size of the range in bytes
185 * Partial pages will be considered reserved and left as they are.
187 * The range must be contiguous but may span node boundaries.
189 void __init free_bootmem(unsigned long addr, unsigned long size)
191 kmemleak_free_part(__va(addr), size);
192 memblock_free(addr, size);
195 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
202 if (WARN_ON_ONCE(slab_is_available()))
203 return kzalloc(size, GFP_NOWAIT);
207 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
221 * __alloc_bootmem_nopanic - allocate boot memory without panicking
222 * @size: size of the request in bytes
223 * @align: alignment of the region
224 * @goal: preferred starting address of the region
226 * The goal is dropped if it can not be satisfied and the allocation will
227 * fall back to memory below @goal.
229 * Allocation may happen on any node in the system.
231 * Returns NULL on failure.
233 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
236 unsigned long limit = -1UL;
238 return ___alloc_bootmem_nopanic(size, align, goal, limit);
241 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
242 unsigned long goal, unsigned long limit)
244 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
249 * Whoops, we cannot satisfy the allocation request.
251 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
252 panic("Out of memory");
257 * __alloc_bootmem - allocate boot memory
258 * @size: size of the request in bytes
259 * @align: alignment of the region
260 * @goal: preferred starting address of the region
262 * The goal is dropped if it can not be satisfied and the allocation will
263 * fall back to memory below @goal.
265 * Allocation may happen on any node in the system.
267 * The function panics if the request can not be satisfied.
269 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
272 unsigned long limit = -1UL;
274 return ___alloc_bootmem(size, align, goal, limit);
278 * __alloc_bootmem_node - allocate boot memory from a specific node
279 * @pgdat: node to allocate from
280 * @size: size of the request in bytes
281 * @align: alignment of the region
282 * @goal: preferred starting address of the region
284 * The goal is dropped if it can not be satisfied and the allocation will
285 * fall back to memory below @goal.
287 * Allocation may fall back to any node in the system if the specified node
288 * can not hold the requested memory.
290 * The function panics if the request can not be satisfied.
292 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
293 unsigned long align, unsigned long goal)
297 if (WARN_ON_ONCE(slab_is_available()))
298 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
301 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
306 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
315 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
316 unsigned long align, unsigned long goal)
318 return __alloc_bootmem_node(pgdat, size, align, goal);
321 #ifdef CONFIG_SPARSEMEM
323 * alloc_bootmem_section - allocate boot memory from a specific section
324 * @size: size of the request in bytes
325 * @section_nr: sparse map section to allocate from
327 * Return NULL on failure.
329 void * __init alloc_bootmem_section(unsigned long size,
330 unsigned long section_nr)
332 unsigned long pfn, goal, limit;
334 pfn = section_nr_to_pfn(section_nr);
335 goal = pfn << PAGE_SHIFT;
336 limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
338 return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
339 SMP_CACHE_BYTES, goal, limit);
343 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
344 unsigned long align, unsigned long goal)
348 if (WARN_ON_ONCE(slab_is_available()))
349 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
351 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
356 return __alloc_bootmem_nopanic(size, align, goal);
359 #ifndef ARCH_LOW_ADDRESS_LIMIT
360 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
364 * __alloc_bootmem_low - allocate low boot memory
365 * @size: size of the request in bytes
366 * @align: alignment of the region
367 * @goal: preferred starting address of the region
369 * The goal is dropped if it can not be satisfied and the allocation will
370 * fall back to memory below @goal.
372 * Allocation may happen on any node in the system.
374 * The function panics if the request can not be satisfied.
376 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
379 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
383 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
384 * @pgdat: node to allocate from
385 * @size: size of the request in bytes
386 * @align: alignment of the region
387 * @goal: preferred starting address of the region
389 * The goal is dropped if it can not be satisfied and the allocation will
390 * fall back to memory below @goal.
392 * Allocation may fall back to any node in the system if the specified node
393 * can not hold the requested memory.
395 * The function panics if the request can not be satisfied.
397 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
398 unsigned long align, unsigned long goal)
402 if (WARN_ON_ONCE(slab_is_available()))
403 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
405 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
406 goal, ARCH_LOW_ADDRESS_LIMIT);
410 return __alloc_memory_core_early(MAX_NUMNODES, size, align,
411 goal, ARCH_LOW_ADDRESS_LIMIT);