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,
40 ulong flags = choose_memblock_flags();
42 if (limit > memblock.current_limit)
43 limit = memblock.current_limit;
46 addr = memblock_find_in_range_node(size, align, goal, limit, nid,
48 if (!addr && (flags & MEMBLOCK_MIRROR)) {
49 flags &= ~MEMBLOCK_MIRROR;
50 pr_warn("Could not allocate %pap bytes of mirrored memory\n",
57 if (memblock_reserve(addr, size))
60 ptr = phys_to_virt(addr);
63 * The min_count is set to 0 so that bootmem allocated blocks
64 * are never reported as leaks.
66 kmemleak_alloc(ptr, size, 0, 0);
71 * free_bootmem_late - free bootmem pages directly to page allocator
72 * @addr: starting address of the range
73 * @size: size of the range in bytes
75 * This is only useful when the bootmem allocator has already been torn
76 * down, but we are still initializing the system. Pages are given directly
77 * to the page allocator, no bootmem metadata is updated because it is gone.
79 void __init free_bootmem_late(unsigned long addr, unsigned long size)
81 unsigned long cursor, end;
83 kmemleak_free_part(__va(addr), size);
85 cursor = PFN_UP(addr);
86 end = PFN_DOWN(addr + size);
88 for (; cursor < end; cursor++) {
89 __free_pages_bootmem(pfn_to_page(cursor), 0);
94 static void __init __free_pages_memory(unsigned long start, unsigned long end)
99 order = min(MAX_ORDER - 1UL, __ffs(start));
101 while (start + (1UL << order) > end)
104 __free_pages_bootmem(pfn_to_page(start), order);
106 start += (1UL << order);
110 static unsigned long __init __free_memory_core(phys_addr_t start,
113 unsigned long start_pfn = PFN_UP(start);
114 unsigned long end_pfn = min_t(unsigned long,
115 PFN_DOWN(end), max_low_pfn);
117 if (start_pfn > end_pfn)
120 __free_pages_memory(start_pfn, end_pfn);
122 return end_pfn - start_pfn;
125 static unsigned long __init free_low_memory_core_early(void)
127 unsigned long count = 0;
128 phys_addr_t start, end;
131 memblock_clear_hotplug(0, -1);
133 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
135 count += __free_memory_core(start, end);
137 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
141 /* Free memblock.reserved array if it was allocated */
142 size = get_allocated_memblock_reserved_regions_info(&start);
144 count += __free_memory_core(start, start + size);
146 /* Free memblock.memory array if it was allocated */
147 size = get_allocated_memblock_memory_regions_info(&start);
149 count += __free_memory_core(start, start + size);
156 static int reset_managed_pages_done __initdata;
158 void reset_node_managed_pages(pg_data_t *pgdat)
162 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
163 z->managed_pages = 0;
166 void __init reset_all_zones_managed_pages(void)
168 struct pglist_data *pgdat;
170 if (reset_managed_pages_done)
173 for_each_online_pgdat(pgdat)
174 reset_node_managed_pages(pgdat);
176 reset_managed_pages_done = 1;
180 * free_all_bootmem - release free pages to the buddy allocator
182 * Returns the number of pages actually released.
184 unsigned long __init free_all_bootmem(void)
188 reset_all_zones_managed_pages();
191 * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
192 * because in some case like Node0 doesn't have RAM installed
193 * low ram will be on Node1
195 pages = free_low_memory_core_early();
196 totalram_pages += pages;
202 * free_bootmem_node - mark a page range as usable
203 * @pgdat: node the range resides on
204 * @physaddr: starting address of the range
205 * @size: size of the range in bytes
207 * Partial pages will be considered reserved and left as they are.
209 * The range must reside completely on the specified node.
211 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
214 memblock_free(physaddr, size);
218 * free_bootmem - mark a page range as usable
219 * @addr: starting address of the range
220 * @size: size of the range in bytes
222 * Partial pages will be considered reserved and left as they are.
224 * The range must be contiguous but may span node boundaries.
226 void __init free_bootmem(unsigned long addr, unsigned long size)
228 memblock_free(addr, size);
231 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
238 if (WARN_ON_ONCE(slab_is_available()))
239 return kzalloc(size, GFP_NOWAIT);
243 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
257 * __alloc_bootmem_nopanic - allocate boot memory without panicking
258 * @size: size of the request in bytes
259 * @align: alignment of the region
260 * @goal: preferred starting address of the region
262 * The goal is dropped if it can not be satisfied and the allocation will
263 * fall back to memory below @goal.
265 * Allocation may happen on any node in the system.
267 * Returns NULL on failure.
269 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
272 unsigned long limit = -1UL;
274 return ___alloc_bootmem_nopanic(size, align, goal, limit);
277 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
278 unsigned long goal, unsigned long limit)
280 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
285 * Whoops, we cannot satisfy the allocation request.
287 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
288 panic("Out of memory");
293 * __alloc_bootmem - allocate boot memory
294 * @size: size of the request in bytes
295 * @align: alignment of the region
296 * @goal: preferred starting address of the region
298 * The goal is dropped if it can not be satisfied and the allocation will
299 * fall back to memory below @goal.
301 * Allocation may happen on any node in the system.
303 * The function panics if the request can not be satisfied.
305 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
308 unsigned long limit = -1UL;
310 return ___alloc_bootmem(size, align, goal, limit);
313 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
322 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
327 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
340 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
341 unsigned long align, unsigned long goal)
343 if (WARN_ON_ONCE(slab_is_available()))
344 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
346 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
349 static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
350 unsigned long align, unsigned long goal,
355 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
359 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
360 panic("Out of memory");
365 * __alloc_bootmem_node - allocate boot memory from a specific node
366 * @pgdat: node to allocate from
367 * @size: size of the request in bytes
368 * @align: alignment of the region
369 * @goal: preferred starting address of the region
371 * The goal is dropped if it can not be satisfied and the allocation will
372 * fall back to memory below @goal.
374 * Allocation may fall back to any node in the system if the specified node
375 * can not hold the requested memory.
377 * The function panics if the request can not be satisfied.
379 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
380 unsigned long align, unsigned long goal)
382 if (WARN_ON_ONCE(slab_is_available()))
383 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
385 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
388 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
389 unsigned long align, unsigned long goal)
391 return __alloc_bootmem_node(pgdat, size, align, goal);
394 #ifndef ARCH_LOW_ADDRESS_LIMIT
395 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
399 * __alloc_bootmem_low - allocate low boot memory
400 * @size: size of the request in bytes
401 * @align: alignment of the region
402 * @goal: preferred starting address of the region
404 * The goal is dropped if it can not be satisfied and the allocation will
405 * fall back to memory below @goal.
407 * Allocation may happen on any node in the system.
409 * The function panics if the request can not be satisfied.
411 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
414 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
417 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
421 return ___alloc_bootmem_nopanic(size, align, goal,
422 ARCH_LOW_ADDRESS_LIMIT);
426 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
427 * @pgdat: node to allocate from
428 * @size: size of the request in bytes
429 * @align: alignment of the region
430 * @goal: preferred starting address of the region
432 * The goal is dropped if it can not be satisfied and the allocation will
433 * fall back to memory below @goal.
435 * Allocation may fall back to any node in the system if the specified node
436 * can not hold the requested memory.
438 * The function panics if the request can not be satisfied.
440 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
441 unsigned long align, unsigned long goal)
443 if (WARN_ON_ONCE(slab_is_available()))
444 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
446 return ___alloc_bootmem_node(pgdat, size, align, goal,
447 ARCH_LOW_ADDRESS_LIMIT);