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
);