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)
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 static unsigned long __init free_low_memory_core_early(void)
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);
140 static int reset_managed_pages_done __initdata;
142 static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
146 if (reset_managed_pages_done)
148 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
149 z->managed_pages = 0;
152 void __init reset_all_zones_managed_pages(void)
154 struct pglist_data *pgdat;
156 for_each_online_pgdat(pgdat)
157 reset_node_managed_pages(pgdat);
158 reset_managed_pages_done = 1;
162 * free_all_bootmem - release free pages to the buddy allocator
164 * Returns the number of pages actually released.
166 unsigned long __init free_all_bootmem(void)
168 reset_all_zones_managed_pages();
171 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
172 * because in some case like Node0 doesn't have RAM installed
173 * low ram will be on Node1
175 return free_low_memory_core_early();
179 * free_bootmem_node - mark a page range as usable
180 * @pgdat: node the range resides on
181 * @physaddr: starting address of the range
182 * @size: size of the range in bytes
184 * Partial pages will be considered reserved and left as they are.
186 * The range must reside completely on the specified node.
188 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
191 kmemleak_free_part(__va(physaddr), size);
192 memblock_free(physaddr, size);
196 * free_bootmem - mark a page range as usable
197 * @addr: starting address of the range
198 * @size: size of the range in bytes
200 * Partial pages will be considered reserved and left as they are.
202 * The range must be contiguous but may span node boundaries.
204 void __init free_bootmem(unsigned long addr, unsigned long size)
206 kmemleak_free_part(__va(addr), size);
207 memblock_free(addr, size);
210 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
217 if (WARN_ON_ONCE(slab_is_available()))
218 return kzalloc(size, GFP_NOWAIT);
222 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
236 * __alloc_bootmem_nopanic - allocate boot memory without panicking
237 * @size: size of the request in bytes
238 * @align: alignment of the region
239 * @goal: preferred starting address of the region
241 * The goal is dropped if it can not be satisfied and the allocation will
242 * fall back to memory below @goal.
244 * Allocation may happen on any node in the system.
246 * Returns NULL on failure.
248 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
251 unsigned long limit = -1UL;
253 return ___alloc_bootmem_nopanic(size, align, goal, limit);
256 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
257 unsigned long goal, unsigned long limit)
259 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
264 * Whoops, we cannot satisfy the allocation request.
266 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
267 panic("Out of memory");
272 * __alloc_bootmem - allocate boot memory
273 * @size: size of the request in bytes
274 * @align: alignment of the region
275 * @goal: preferred starting address of the region
277 * The goal is dropped if it can not be satisfied and the allocation will
278 * fall back to memory below @goal.
280 * Allocation may happen on any node in the system.
282 * The function panics if the request can not be satisfied.
284 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
287 unsigned long limit = -1UL;
289 return ___alloc_bootmem(size, align, goal, limit);
292 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
301 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
306 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
319 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
320 unsigned long align, unsigned long goal)
322 if (WARN_ON_ONCE(slab_is_available()))
323 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
325 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
328 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
329 unsigned long align, unsigned long goal,
334 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
338 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
339 panic("Out of memory");
344 * __alloc_bootmem_node - allocate boot memory from a specific node
345 * @pgdat: node to allocate from
346 * @size: size of the request in bytes
347 * @align: alignment of the region
348 * @goal: preferred starting address of the region
350 * The goal is dropped if it can not be satisfied and the allocation will
351 * fall back to memory below @goal.
353 * Allocation may fall back to any node in the system if the specified node
354 * can not hold the requested memory.
356 * The function panics if the request can not be satisfied.
358 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
359 unsigned long align, unsigned long goal)
361 if (WARN_ON_ONCE(slab_is_available()))
362 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
364 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
367 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
368 unsigned long align, unsigned long goal)
370 return __alloc_bootmem_node(pgdat, size, align, goal);
373 #ifndef ARCH_LOW_ADDRESS_LIMIT
374 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
378 * __alloc_bootmem_low - allocate low boot memory
379 * @size: size of the request in bytes
380 * @align: alignment of the region
381 * @goal: preferred starting address of the region
383 * The goal is dropped if it can not be satisfied and the allocation will
384 * fall back to memory below @goal.
386 * Allocation may happen on any node in the system.
388 * The function panics if the request can not be satisfied.
390 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
393 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
396 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
400 return ___alloc_bootmem_nopanic(size, align, goal,
401 ARCH_LOW_ADDRESS_LIMIT);
405 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
406 * @pgdat: node to allocate from
407 * @size: size of the request in bytes
408 * @align: alignment of the region
409 * @goal: preferred starting address of the region
411 * The goal is dropped if it can not be satisfied and the allocation will
412 * fall back to memory below @goal.
414 * Allocation may fall back to any node in the system if the specified node
415 * can not hold the requested memory.
417 * The function panics if the request can not be satisfied.
419 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
420 unsigned long align, unsigned long goal)
422 if (WARN_ON_ONCE(slab_is_available()))
423 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
425 return ___alloc_bootmem_node(pgdat, size, align, goal,
426 ARCH_LOW_ADDRESS_LIMIT);