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/export.h>
15 #include <linux/kmemleak.h>
16 #include <linux/range.h>
17 #include <linux/memblock.h>
18 #include <linux/bootmem.h>
25 #ifndef CONFIG_HAVE_MEMBLOCK
26 #error CONFIG_HAVE_MEMBLOCK not defined
29 #ifndef CONFIG_NEED_MULTIPLE_NODES
30 struct pglist_data __refdata contig_page_data;
31 EXPORT_SYMBOL(contig_page_data);
34 unsigned long max_low_pfn;
35 unsigned long min_low_pfn;
36 unsigned long max_pfn;
37 unsigned long long max_possible_pfn;
39 static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
44 ulong flags = choose_memblock_flags();
46 if (limit > memblock.current_limit)
47 limit = memblock.current_limit;
50 addr = memblock_find_in_range_node(size, align, goal, limit, nid,
52 if (!addr && (flags & MEMBLOCK_MIRROR)) {
53 flags &= ~MEMBLOCK_MIRROR;
54 pr_warn("Could not allocate %pap bytes of mirrored memory\n",
61 if (memblock_reserve(addr, size))
64 ptr = phys_to_virt(addr);
67 * The min_count is set to 0 so that bootmem allocated blocks
68 * are never reported as leaks.
70 kmemleak_alloc(ptr, size, 0, 0);
75 * free_bootmem_late - free bootmem pages directly to page allocator
76 * @addr: starting address of the range
77 * @size: size of the range in bytes
79 * This is only useful when the bootmem allocator has already been torn
80 * down, but we are still initializing the system. Pages are given directly
81 * to the page allocator, no bootmem metadata is updated because it is gone.
83 void __init free_bootmem_late(unsigned long addr, unsigned long size)
85 unsigned long cursor, end;
87 kmemleak_free_part_phys(addr, size);
89 cursor = PFN_UP(addr);
90 end = PFN_DOWN(addr + size);
92 for (; cursor < end; cursor++) {
93 __free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
98 static void __init __free_pages_memory(unsigned long start, unsigned long end)
102 while (start < end) {
103 order = min(MAX_ORDER - 1UL, __ffs(start));
105 while (start + (1UL << order) > end)
108 __free_pages_bootmem(pfn_to_page(start), start, order);
110 start += (1UL << order);
114 static unsigned long __init __free_memory_core(phys_addr_t start,
117 unsigned long start_pfn = PFN_UP(start);
118 unsigned long end_pfn = min_t(unsigned long,
119 PFN_DOWN(end), max_low_pfn);
121 if (start_pfn >= end_pfn)
124 __free_pages_memory(start_pfn, end_pfn);
126 return end_pfn - start_pfn;
129 static unsigned long __init free_low_memory_core_early(void)
131 unsigned long count = 0;
132 phys_addr_t start, end;
135 memblock_clear_hotplug(0, -1);
137 for_each_reserved_mem_region(i, &start, &end)
138 reserve_bootmem_region(start, end);
141 * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
142 * because in some case like Node0 doesn't have RAM installed
143 * low ram will be on Node1
145 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
147 count += __free_memory_core(start, end);
152 static int reset_managed_pages_done __initdata;
154 void reset_node_managed_pages(pg_data_t *pgdat)
158 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
159 z->managed_pages = 0;
162 void __init reset_all_zones_managed_pages(void)
164 struct pglist_data *pgdat;
166 if (reset_managed_pages_done)
169 for_each_online_pgdat(pgdat)
170 reset_node_managed_pages(pgdat);
172 reset_managed_pages_done = 1;
176 * free_all_bootmem - release free pages to the buddy allocator
178 * Returns the number of pages actually released.
180 unsigned long __init free_all_bootmem(void)
184 reset_all_zones_managed_pages();
186 pages = free_low_memory_core_early();
187 totalram_pages += pages;
193 * free_bootmem_node - mark a page range as usable
194 * @pgdat: node the range resides on
195 * @physaddr: starting address of the range
196 * @size: size of the range in bytes
198 * Partial pages will be considered reserved and left as they are.
200 * The range must reside completely on the specified node.
202 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
205 memblock_free(physaddr, size);
209 * free_bootmem - mark a page range as usable
210 * @addr: starting address of the range
211 * @size: size of the range in bytes
213 * Partial pages will be considered reserved and left as they are.
215 * The range must be contiguous but may span node boundaries.
217 void __init free_bootmem(unsigned long addr, unsigned long size)
219 memblock_free(addr, size);
222 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
229 if (WARN_ON_ONCE(slab_is_available()))
230 return kzalloc(size, GFP_NOWAIT);
234 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
248 * __alloc_bootmem_nopanic - allocate boot memory without panicking
249 * @size: size of the request in bytes
250 * @align: alignment of the region
251 * @goal: preferred starting address of the region
253 * The goal is dropped if it can not be satisfied and the allocation will
254 * fall back to memory below @goal.
256 * Allocation may happen on any node in the system.
258 * Returns NULL on failure.
260 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
263 unsigned long limit = -1UL;
265 return ___alloc_bootmem_nopanic(size, align, goal, limit);
268 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
269 unsigned long goal, unsigned long limit)
271 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
276 * Whoops, we cannot satisfy the allocation request.
278 pr_alert("bootmem alloc of %lu bytes failed!\n", size);
279 panic("Out of memory");
284 * __alloc_bootmem - allocate boot memory
285 * @size: size of the request in bytes
286 * @align: alignment of the region
287 * @goal: preferred starting address of the region
289 * The goal is dropped if it can not be satisfied and the allocation will
290 * fall back to memory below @goal.
292 * Allocation may happen on any node in the system.
294 * The function panics if the request can not be satisfied.
296 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
299 unsigned long limit = -1UL;
301 return ___alloc_bootmem(size, align, goal, limit);
304 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
313 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
318 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
331 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
332 unsigned long align, unsigned long goal)
334 if (WARN_ON_ONCE(slab_is_available()))
335 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
337 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
340 static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
341 unsigned long align, unsigned long goal,
346 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
350 pr_alert("bootmem alloc of %lu bytes failed!\n", size);
351 panic("Out of memory");
356 * __alloc_bootmem_node - allocate boot memory from a specific node
357 * @pgdat: node to allocate from
358 * @size: size of the request in bytes
359 * @align: alignment of the region
360 * @goal: preferred starting address of the region
362 * The goal is dropped if it can not be satisfied and the allocation will
363 * fall back to memory below @goal.
365 * Allocation may fall back to any node in the system if the specified node
366 * can not hold the requested memory.
368 * The function panics if the request can not be satisfied.
370 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
371 unsigned long align, unsigned long goal)
373 if (WARN_ON_ONCE(slab_is_available()))
374 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
376 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
379 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
380 unsigned long align, unsigned long goal)
382 return __alloc_bootmem_node(pgdat, size, align, goal);
387 * __alloc_bootmem_low - allocate low boot memory
388 * @size: size of the request in bytes
389 * @align: alignment of the region
390 * @goal: preferred starting address of the region
392 * The goal is dropped if it can not be satisfied and the allocation will
393 * fall back to memory below @goal.
395 * Allocation may happen on any node in the system.
397 * The function panics if the request can not be satisfied.
399 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
402 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
405 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
409 return ___alloc_bootmem_nopanic(size, align, goal,
410 ARCH_LOW_ADDRESS_LIMIT);
414 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
415 * @pgdat: node to allocate from
416 * @size: size of the request in bytes
417 * @align: alignment of the region
418 * @goal: preferred starting address of the region
420 * The goal is dropped if it can not be satisfied and the allocation will
421 * fall back to memory below @goal.
423 * Allocation may fall back to any node in the system if the specified node
424 * can not hold the requested memory.
426 * The function panics if the request can not be satisfied.
428 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
429 unsigned long align, unsigned long goal)
431 if (WARN_ON_ONCE(slab_is_available()))
432 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
434 return ___alloc_bootmem_node(pgdat, size, align, goal,
435 ARCH_LOW_ADDRESS_LIMIT);