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/module.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 #ifdef CONFIG_CRASH_DUMP
37 * If we have booted due to a crash, max_pfn will be a very low value. We need
38 * to know the amount of memory that the previous kernel used.
40 unsigned long saved_max_pfn;
43 static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
49 if (limit > memblock.current_limit)
50 limit = memblock.current_limit;
52 addr = find_memory_core_early(nid, size, align, goal, limit);
54 if (addr == MEMBLOCK_ERROR)
57 ptr = phys_to_virt(addr);
59 memblock_x86_reserve_range(addr, addr + size, "BOOTMEM");
61 * The min_count is set to 0 so that bootmem allocated blocks
62 * are never reported as leaks.
64 kmemleak_alloc(ptr, size, 0, 0);
69 * free_bootmem_late - free bootmem pages directly to page allocator
70 * @addr: starting address of the range
71 * @size: size of the range in bytes
73 * This is only useful when the bootmem allocator has already been torn
74 * down, but we are still initializing the system. Pages are given directly
75 * to the page allocator, no bootmem metadata is updated because it is gone.
77 void __init free_bootmem_late(unsigned long addr, unsigned long size)
79 unsigned long cursor, end;
81 kmemleak_free_part(__va(addr), size);
83 cursor = PFN_UP(addr);
84 end = PFN_DOWN(addr + size);
86 for (; cursor < end; cursor++) {
87 __free_pages_bootmem(pfn_to_page(cursor), 0);
92 static void __init __free_pages_memory(unsigned long start, unsigned long end)
95 unsigned long start_aligned, end_aligned;
96 int order = ilog2(BITS_PER_LONG);
98 start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
99 end_aligned = end & ~(BITS_PER_LONG - 1);
101 if (end_aligned <= start_aligned) {
102 for (i = start; i < end; i++)
103 __free_pages_bootmem(pfn_to_page(i), 0);
108 for (i = start; i < start_aligned; i++)
109 __free_pages_bootmem(pfn_to_page(i), 0);
111 for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
112 __free_pages_bootmem(pfn_to_page(i), order);
114 for (i = end_aligned; i < end; i++)
115 __free_pages_bootmem(pfn_to_page(i), 0);
118 unsigned long __init free_all_memory_core_early(int nodeid)
122 unsigned long count = 0;
123 struct range *range = NULL;
126 nr_range = get_free_all_memory_range(&range, nodeid);
128 for (i = 0; i < nr_range; i++) {
129 start = range[i].start;
131 count += end - start;
132 __free_pages_memory(start, end);
139 * free_all_bootmem_node - release a node's free pages to the buddy allocator
140 * @pgdat: node to be released
142 * Returns the number of pages actually released.
144 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
146 register_page_bootmem_info_node(pgdat);
148 /* free_all_memory_core_early(MAX_NUMNODES) will be called later */
153 * free_all_bootmem - release free pages to the buddy allocator
155 * Returns the number of pages actually released.
157 unsigned long __init free_all_bootmem(void)
160 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
161 * because in some case like Node0 doesnt have RAM installed
162 * low ram will be on Node1
163 * Use MAX_NUMNODES will make sure all ranges in early_node_map[]
164 * will be used instead of only Node0 related
166 return free_all_memory_core_early(MAX_NUMNODES);
170 * free_bootmem_node - mark a page range as usable
171 * @pgdat: node the range resides on
172 * @physaddr: starting address of the range
173 * @size: size of the range in bytes
175 * Partial pages will be considered reserved and left as they are.
177 * The range must reside completely on the specified node.
179 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
182 kmemleak_free_part(__va(physaddr), size);
183 memblock_x86_free_range(physaddr, physaddr + size);
187 * free_bootmem - mark a page range as usable
188 * @addr: starting address of the range
189 * @size: size of the range in bytes
191 * Partial pages will be considered reserved and left as they are.
193 * The range must be contiguous but may span node boundaries.
195 void __init free_bootmem(unsigned long addr, unsigned long size)
197 kmemleak_free_part(__va(addr), size);
198 memblock_x86_free_range(addr, addr + size);
201 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
208 if (WARN_ON_ONCE(slab_is_available()))
209 return kzalloc(size, GFP_NOWAIT);
213 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
227 * __alloc_bootmem_nopanic - allocate boot memory without panicking
228 * @size: size of the request in bytes
229 * @align: alignment of the region
230 * @goal: preferred starting address of the region
232 * The goal is dropped if it can not be satisfied and the allocation will
233 * fall back to memory below @goal.
235 * Allocation may happen on any node in the system.
237 * Returns NULL on failure.
239 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
242 unsigned long limit = -1UL;
244 return ___alloc_bootmem_nopanic(size, align, goal, limit);
247 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
248 unsigned long goal, unsigned long limit)
250 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
255 * Whoops, we cannot satisfy the allocation request.
257 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
258 panic("Out of memory");
263 * __alloc_bootmem - allocate boot memory
264 * @size: size of the request in bytes
265 * @align: alignment of the region
266 * @goal: preferred starting address of the region
268 * The goal is dropped if it can not be satisfied and the allocation will
269 * fall back to memory below @goal.
271 * Allocation may happen on any node in the system.
273 * The function panics if the request can not be satisfied.
275 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
278 unsigned long limit = -1UL;
280 return ___alloc_bootmem(size, align, goal, limit);
284 * __alloc_bootmem_node - allocate boot memory from a specific node
285 * @pgdat: node to allocate from
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 fall back to any node in the system if the specified node
294 * can not hold the requested memory.
296 * The function panics if the request can not be satisfied.
298 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
299 unsigned long align, unsigned long goal)
303 if (WARN_ON_ONCE(slab_is_available()))
304 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
306 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
311 return __alloc_memory_core_early(MAX_NUMNODES, size, align,
315 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
316 unsigned long align, unsigned long goal)
319 unsigned long end_pfn;
321 if (WARN_ON_ONCE(slab_is_available()))
322 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
324 /* update goal according ...MAX_DMA32_PFN */
325 end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
327 if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
328 (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
330 unsigned long new_goal;
332 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
333 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
340 return __alloc_bootmem_node(pgdat, size, align, goal);
344 #ifdef CONFIG_SPARSEMEM
346 * alloc_bootmem_section - allocate boot memory from a specific section
347 * @size: size of the request in bytes
348 * @section_nr: sparse map section to allocate from
350 * Return NULL on failure.
352 void * __init alloc_bootmem_section(unsigned long size,
353 unsigned long section_nr)
355 unsigned long pfn, goal, limit;
357 pfn = section_nr_to_pfn(section_nr);
358 goal = pfn << PAGE_SHIFT;
359 limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
361 return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
362 SMP_CACHE_BYTES, goal, limit);
366 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
367 unsigned long align, unsigned long goal)
371 if (WARN_ON_ONCE(slab_is_available()))
372 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
374 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
379 return __alloc_bootmem_nopanic(size, align, goal);
382 #ifndef ARCH_LOW_ADDRESS_LIMIT
383 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
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);
406 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
407 * @pgdat: node to allocate from
408 * @size: size of the request in bytes
409 * @align: alignment of the region
410 * @goal: preferred starting address of the region
412 * The goal is dropped if it can not be satisfied and the allocation will
413 * fall back to memory below @goal.
415 * Allocation may fall back to any node in the system if the specified node
416 * can not hold the requested memory.
418 * The function panics if the request can not be satisfied.
420 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
421 unsigned long align, unsigned long goal)
425 if (WARN_ON_ONCE(slab_is_available()))
426 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
428 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
429 goal, ARCH_LOW_ADDRESS_LIMIT);
433 return __alloc_memory_core_early(MAX_NUMNODES, size, align,
434 goal, ARCH_LOW_ADDRESS_LIMIT);