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;
122 for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL)
123 count += __free_memory_core(start, end);
125 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
129 /* Free memblock.reserved array if it was allocated */
130 size = get_allocated_memblock_reserved_regions_info(&start);
132 count += __free_memory_core(start, start + size);
134 /* Free memblock.memory array if it was allocated */
135 size = get_allocated_memblock_memory_regions_info(&start);
137 count += __free_memory_core(start, start + size);
144 static int reset_managed_pages_done __initdata;
146 static inline void __init reset_node_managed_pages(pg_data_t *pgdat)
150 if (reset_managed_pages_done)
152 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
153 z->managed_pages = 0;
156 void __init reset_all_zones_managed_pages(void)
158 struct pglist_data *pgdat;
160 for_each_online_pgdat(pgdat)
161 reset_node_managed_pages(pgdat);
162 reset_managed_pages_done = 1;
166 * free_all_bootmem - release free pages to the buddy allocator
168 * Returns the number of pages actually released.
170 unsigned long __init free_all_bootmem(void)
174 reset_all_zones_managed_pages();
177 * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
178 * because in some case like Node0 doesn't have RAM installed
179 * low ram will be on Node1
181 pages = free_low_memory_core_early();
182 totalram_pages += pages;
188 * free_bootmem_node - mark a page range as usable
189 * @pgdat: node the range resides on
190 * @physaddr: starting address of the range
191 * @size: size of the range in bytes
193 * Partial pages will be considered reserved and left as they are.
195 * The range must reside completely on the specified node.
197 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
200 memblock_free(physaddr, size);
204 * free_bootmem - mark a page range as usable
205 * @addr: starting address of the range
206 * @size: size of the range in bytes
208 * Partial pages will be considered reserved and left as they are.
210 * The range must be contiguous but may span node boundaries.
212 void __init free_bootmem(unsigned long addr, unsigned long size)
214 memblock_free(addr, size);
217 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
224 if (WARN_ON_ONCE(slab_is_available()))
225 return kzalloc(size, GFP_NOWAIT);
229 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
243 * __alloc_bootmem_nopanic - allocate boot memory without panicking
244 * @size: size of the request in bytes
245 * @align: alignment of the region
246 * @goal: preferred starting address of the region
248 * The goal is dropped if it can not be satisfied and the allocation will
249 * fall back to memory below @goal.
251 * Allocation may happen on any node in the system.
253 * Returns NULL on failure.
255 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
258 unsigned long limit = -1UL;
260 return ___alloc_bootmem_nopanic(size, align, goal, limit);
263 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
264 unsigned long goal, unsigned long limit)
266 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
271 * Whoops, we cannot satisfy the allocation request.
273 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
274 panic("Out of memory");
279 * __alloc_bootmem - allocate boot memory
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 happen on any node in the system.
289 * The function panics if the request can not be satisfied.
291 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
294 unsigned long limit = -1UL;
296 return ___alloc_bootmem(size, align, goal, limit);
299 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
308 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
313 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
326 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
327 unsigned long align, unsigned long goal)
329 if (WARN_ON_ONCE(slab_is_available()))
330 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
332 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
335 static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
336 unsigned long align, unsigned long goal,
341 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
345 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
346 panic("Out of memory");
351 * __alloc_bootmem_node - allocate boot memory from a specific node
352 * @pgdat: node to allocate from
353 * @size: size of the request in bytes
354 * @align: alignment of the region
355 * @goal: preferred starting address of the region
357 * The goal is dropped if it can not be satisfied and the allocation will
358 * fall back to memory below @goal.
360 * Allocation may fall back to any node in the system if the specified node
361 * can not hold the requested memory.
363 * The function panics if the request can not be satisfied.
365 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
366 unsigned long align, unsigned long goal)
368 if (WARN_ON_ONCE(slab_is_available()))
369 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
371 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
374 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
375 unsigned long align, unsigned long goal)
377 return __alloc_bootmem_node(pgdat, size, align, goal);
380 #ifndef ARCH_LOW_ADDRESS_LIMIT
381 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
385 * __alloc_bootmem_low - allocate low boot memory
386 * @size: size of the request in bytes
387 * @align: alignment of the region
388 * @goal: preferred starting address of the region
390 * The goal is dropped if it can not be satisfied and the allocation will
391 * fall back to memory below @goal.
393 * Allocation may happen on any node in the system.
395 * The function panics if the request can not be satisfied.
397 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
400 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
403 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
407 return ___alloc_bootmem_nopanic(size, align, goal,
408 ARCH_LOW_ADDRESS_LIMIT);
412 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
413 * @pgdat: node to allocate from
414 * @size: size of the request in bytes
415 * @align: alignment of the region
416 * @goal: preferred starting address of the region
418 * The goal is dropped if it can not be satisfied and the allocation will
419 * fall back to memory below @goal.
421 * Allocation may fall back to any node in the system if the specified node
422 * can not hold the requested memory.
424 * The function panics if the request can not be satisfied.
426 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
427 unsigned long align, unsigned long goal)
429 if (WARN_ON_ONCE(slab_is_available()))
430 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
432 return ___alloc_bootmem_node(pgdat, size, align, goal,
433 ARCH_LOW_ADDRESS_LIMIT);