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(size, align, goal, limit, nid);
48 if (memblock_reserve(addr, size))
51 ptr = phys_to_virt(addr);
54 * The min_count is set to 0 so that bootmem allocated blocks
55 * are never reported as leaks.
57 kmemleak_alloc(ptr, size, 0, 0);
62 * free_bootmem_late - free bootmem pages directly to page allocator
63 * @addr: starting address of the range
64 * @size: size of the range in bytes
66 * This is only useful when the bootmem allocator has already been torn
67 * down, but we are still initializing the system. Pages are given directly
68 * to the page allocator, no bootmem metadata is updated because it is gone.
70 void __init free_bootmem_late(unsigned long addr, unsigned long size)
72 unsigned long cursor, end;
74 kmemleak_free_part(__va(addr), size);
76 cursor = PFN_UP(addr);
77 end = PFN_DOWN(addr + size);
79 for (; cursor < end; cursor++) {
80 __free_pages_bootmem(pfn_to_page(cursor), 0);
85 static void __init __free_pages_memory(unsigned long start, unsigned long end)
90 order = min(MAX_ORDER - 1UL, __ffs(start));
92 while (start + (1UL << order) > end)
95 __free_pages_bootmem(pfn_to_page(start), order);
97 start += (1UL << order);
101 static unsigned long __init __free_memory_core(phys_addr_t start,
104 unsigned long start_pfn = PFN_UP(start);
105 unsigned long end_pfn = min_t(unsigned long,
106 PFN_DOWN(end), max_low_pfn);
108 if (start_pfn > end_pfn)
111 __free_pages_memory(start_pfn, end_pfn);
113 return end_pfn - start_pfn;
116 static unsigned long __init free_low_memory_core_early(void)
118 unsigned long count = 0;
119 phys_addr_t start, end, size;
122 for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL)
123 count += __free_memory_core(start, end);
125 /* Free memblock.reserved array if it was allocated */
126 size = get_allocated_memblock_reserved_regions_info(&start);
128 count += __free_memory_core(start, start + size);
130 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
132 /* Free memblock.memory array if it was allocated */
133 size = get_allocated_memblock_memory_regions_info(&start);
135 count += __free_memory_core(start, start + size);
141 static int reset_managed_pages_done __initdata;
143 static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
147 if (reset_managed_pages_done)
149 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
150 z->managed_pages = 0;
153 void __init reset_all_zones_managed_pages(void)
155 struct pglist_data *pgdat;
157 for_each_online_pgdat(pgdat)
158 reset_node_managed_pages(pgdat);
159 reset_managed_pages_done = 1;
163 * free_all_bootmem - release free pages to the buddy allocator
165 * Returns the number of pages actually released.
167 unsigned long __init free_all_bootmem(void)
171 reset_all_zones_managed_pages();
174 * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
175 * because in some case like Node0 doesn't have RAM installed
176 * low ram will be on Node1
178 pages = free_low_memory_core_early();
179 totalram_pages += pages;
185 * free_bootmem_node - mark a page range as usable
186 * @pgdat: node the range resides on
187 * @physaddr: starting address of the range
188 * @size: size of the range in bytes
190 * Partial pages will be considered reserved and left as they are.
192 * The range must reside completely on the specified node.
194 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
197 kmemleak_free_part(__va(physaddr), size);
198 memblock_free(physaddr, size);
202 * free_bootmem - mark a page range as usable
203 * @addr: starting address of the range
204 * @size: size of the range in bytes
206 * Partial pages will be considered reserved and left as they are.
208 * The range must be contiguous but may span node boundaries.
210 void __init free_bootmem(unsigned long addr, unsigned long size)
212 kmemleak_free_part(__va(addr), size);
213 memblock_free(addr, size);
216 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
223 if (WARN_ON_ONCE(slab_is_available()))
224 return kzalloc(size, GFP_NOWAIT);
228 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
242 * __alloc_bootmem_nopanic - allocate boot memory without panicking
243 * @size: size of the request in bytes
244 * @align: alignment of the region
245 * @goal: preferred starting address of the region
247 * The goal is dropped if it can not be satisfied and the allocation will
248 * fall back to memory below @goal.
250 * Allocation may happen on any node in the system.
252 * Returns NULL on failure.
254 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
257 unsigned long limit = -1UL;
259 return ___alloc_bootmem_nopanic(size, align, goal, limit);
262 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
263 unsigned long goal, unsigned long limit)
265 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
270 * Whoops, we cannot satisfy the allocation request.
272 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
273 panic("Out of memory");
278 * __alloc_bootmem - allocate boot memory
279 * @size: size of the request in bytes
280 * @align: alignment of the region
281 * @goal: preferred starting address of the region
283 * The goal is dropped if it can not be satisfied and the allocation will
284 * fall back to memory below @goal.
286 * Allocation may happen on any node in the system.
288 * The function panics if the request can not be satisfied.
290 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
293 unsigned long limit = -1UL;
295 return ___alloc_bootmem(size, align, goal, limit);
298 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
307 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
312 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
325 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
326 unsigned long align, unsigned long goal)
328 if (WARN_ON_ONCE(slab_is_available()))
329 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
331 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
334 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
335 unsigned long align, unsigned long goal,
340 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
344 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
345 panic("Out of memory");
350 * __alloc_bootmem_node - allocate boot memory from a specific node
351 * @pgdat: node to allocate from
352 * @size: size of the request in bytes
353 * @align: alignment of the region
354 * @goal: preferred starting address of the region
356 * The goal is dropped if it can not be satisfied and the allocation will
357 * fall back to memory below @goal.
359 * Allocation may fall back to any node in the system if the specified node
360 * can not hold the requested memory.
362 * The function panics if the request can not be satisfied.
364 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
365 unsigned long align, unsigned long goal)
367 if (WARN_ON_ONCE(slab_is_available()))
368 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
370 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
373 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
374 unsigned long align, unsigned long goal)
376 return __alloc_bootmem_node(pgdat, size, align, goal);
379 #ifndef ARCH_LOW_ADDRESS_LIMIT
380 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
384 * __alloc_bootmem_low - allocate low boot memory
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 happen on any node in the system.
394 * The function panics if the request can not be satisfied.
396 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
399 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
402 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
406 return ___alloc_bootmem_nopanic(size, align, goal,
407 ARCH_LOW_ADDRESS_LIMIT);
411 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
412 * @pgdat: node to allocate from
413 * @size: size of the request in bytes
414 * @align: alignment of the region
415 * @goal: preferred starting address of the region
417 * The goal is dropped if it can not be satisfied and the allocation will
418 * fall back to memory below @goal.
420 * Allocation may fall back to any node in the system if the specified node
421 * can not hold the requested memory.
423 * The function panics if the request can not be satisfied.
425 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
426 unsigned long align, unsigned long goal)
428 if (WARN_ON_ONCE(slab_is_available()))
429 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
431 return ___alloc_bootmem_node(pgdat, size, align, goal,
432 ARCH_LOW_ADDRESS_LIMIT);