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,
49 if (memblock_reserve(addr, size))
52 ptr = phys_to_virt(addr);
55 * The min_count is set to 0 so that bootmem allocated blocks
56 * are never reported as leaks.
58 kmemleak_alloc(ptr, size, 0, 0);
63 * free_bootmem_late - free bootmem pages directly to page allocator
64 * @addr: starting address of the range
65 * @size: size of the range in bytes
67 * This is only useful when the bootmem allocator has already been torn
68 * down, but we are still initializing the system. Pages are given directly
69 * to the page allocator, no bootmem metadata is updated because it is gone.
71 void __init free_bootmem_late(unsigned long addr, unsigned long size)
73 unsigned long cursor, end;
75 kmemleak_free_part(__va(addr), size);
77 cursor = PFN_UP(addr);
78 end = PFN_DOWN(addr + size);
80 for (; cursor < end; cursor++) {
81 __free_pages_bootmem(pfn_to_page(cursor), 0);
86 static void __init __free_pages_memory(unsigned long start, unsigned long end)
91 order = min(MAX_ORDER - 1UL, __ffs(start));
93 while (start + (1UL << order) > end)
96 __free_pages_bootmem(pfn_to_page(start), order);
98 start += (1UL << order);
102 static unsigned long __init __free_memory_core(phys_addr_t start,
105 unsigned long start_pfn = PFN_UP(start);
106 unsigned long end_pfn = min_t(unsigned long,
107 PFN_DOWN(end), max_low_pfn);
109 if (start_pfn > end_pfn)
112 __free_pages_memory(start_pfn, end_pfn);
114 return end_pfn - start_pfn;
117 static unsigned long __init free_low_memory_core_early(void)
119 unsigned long count = 0;
120 phys_addr_t start, end;
123 memblock_clear_hotplug(0, -1);
125 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
127 count += __free_memory_core(start, end);
129 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
133 /* Free memblock.reserved array if it was allocated */
134 size = get_allocated_memblock_reserved_regions_info(&start);
136 count += __free_memory_core(start, start + size);
138 /* Free memblock.memory array if it was allocated */
139 size = get_allocated_memblock_memory_regions_info(&start);
141 count += __free_memory_core(start, start + size);
148 static int reset_managed_pages_done __initdata;
150 void reset_node_managed_pages(pg_data_t *pgdat)
154 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
155 z->managed_pages = 0;
158 void __init reset_all_zones_managed_pages(void)
160 struct pglist_data *pgdat;
162 if (reset_managed_pages_done)
165 for_each_online_pgdat(pgdat)
166 reset_node_managed_pages(pgdat);
168 reset_managed_pages_done = 1;
172 * free_all_bootmem - release free pages to the buddy allocator
174 * Returns the number of pages actually released.
176 unsigned long __init free_all_bootmem(void)
180 reset_all_zones_managed_pages();
183 * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
184 * because in some case like Node0 doesn't have RAM installed
185 * low ram will be on Node1
187 pages = free_low_memory_core_early();
188 totalram_pages += pages;
194 * free_bootmem_node - mark a page range as usable
195 * @pgdat: node the range resides on
196 * @physaddr: starting address of the range
197 * @size: size of the range in bytes
199 * Partial pages will be considered reserved and left as they are.
201 * The range must reside completely on the specified node.
203 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
206 memblock_free(physaddr, size);
210 * free_bootmem - mark a page range as usable
211 * @addr: starting address of the range
212 * @size: size of the range in bytes
214 * Partial pages will be considered reserved and left as they are.
216 * The range must be contiguous but may span node boundaries.
218 void __init free_bootmem(unsigned long addr, unsigned long size)
220 memblock_free(addr, size);
223 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
230 if (WARN_ON_ONCE(slab_is_available()))
231 return kzalloc(size, GFP_NOWAIT);
235 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
249 * __alloc_bootmem_nopanic - allocate boot memory without panicking
250 * @size: size of the request in bytes
251 * @align: alignment of the region
252 * @goal: preferred starting address of the region
254 * The goal is dropped if it can not be satisfied and the allocation will
255 * fall back to memory below @goal.
257 * Allocation may happen on any node in the system.
259 * Returns NULL on failure.
261 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
264 unsigned long limit = -1UL;
266 return ___alloc_bootmem_nopanic(size, align, goal, limit);
269 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
270 unsigned long goal, unsigned long limit)
272 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
277 * Whoops, we cannot satisfy the allocation request.
279 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
280 panic("Out of memory");
285 * __alloc_bootmem - allocate boot memory
286 * @size: size of the request in bytes
287 * @align: alignment of the region
288 * @goal: preferred starting address of the region
290 * The goal is dropped if it can not be satisfied and the allocation will
291 * fall back to memory below @goal.
293 * Allocation may happen on any node in the system.
295 * The function panics if the request can not be satisfied.
297 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
300 unsigned long limit = -1UL;
302 return ___alloc_bootmem(size, align, goal, limit);
305 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
314 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
319 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
332 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
333 unsigned long align, unsigned long goal)
335 if (WARN_ON_ONCE(slab_is_available()))
336 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
338 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
341 static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
342 unsigned long align, unsigned long goal,
347 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
351 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
352 panic("Out of memory");
357 * __alloc_bootmem_node - allocate boot memory from a specific node
358 * @pgdat: node to allocate from
359 * @size: size of the request in bytes
360 * @align: alignment of the region
361 * @goal: preferred starting address of the region
363 * The goal is dropped if it can not be satisfied and the allocation will
364 * fall back to memory below @goal.
366 * Allocation may fall back to any node in the system if the specified node
367 * can not hold the requested memory.
369 * The function panics if the request can not be satisfied.
371 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
372 unsigned long align, unsigned long goal)
374 if (WARN_ON_ONCE(slab_is_available()))
375 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
377 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
380 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
381 unsigned long align, unsigned long goal)
383 return __alloc_bootmem_node(pgdat, size, align, goal);
386 #ifndef ARCH_LOW_ADDRESS_LIMIT
387 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
391 * __alloc_bootmem_low - allocate low boot memory
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 happen on any node in the system.
401 * The function panics if the request can not be satisfied.
403 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
406 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
409 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
413 return ___alloc_bootmem_nopanic(size, align, goal,
414 ARCH_LOW_ADDRESS_LIMIT);
418 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
419 * @pgdat: node to allocate from
420 * @size: size of the request in bytes
421 * @align: alignment of the region
422 * @goal: preferred starting address of the region
424 * The goal is dropped if it can not be satisfied and the allocation will
425 * fall back to memory below @goal.
427 * Allocation may fall back to any node in the system if the specified node
428 * can not hold the requested memory.
430 * The function panics if the request can not be satisfied.
432 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
433 unsigned long align, unsigned long goal)
435 if (WARN_ON_ONCE(slab_is_available()))
436 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
438 return ___alloc_bootmem_node(pgdat, size, align, goal,
439 ARCH_LOW_ADDRESS_LIMIT);