1 // SPDX-License-Identifier: GPL-2.0
3 * bootmem - A boot-time physical memory allocator and configurator
5 * Copyright (C) 1999 Ingo Molnar
6 * 1999 Kanoj Sarcar, SGI
9 * Access to this subsystem has to be serialized externally (which is true
10 * for the boot process anyway).
12 #include <linux/init.h>
13 #include <linux/pfn.h>
14 #include <linux/slab.h>
15 #include <linux/export.h>
16 #include <linux/kmemleak.h>
17 #include <linux/range.h>
18 #include <linux/memblock.h>
19 #include <linux/bootmem.h>
26 #ifndef CONFIG_HAVE_MEMBLOCK
27 #error CONFIG_HAVE_MEMBLOCK not defined
30 #ifndef CONFIG_NEED_MULTIPLE_NODES
31 struct pglist_data __refdata contig_page_data;
32 EXPORT_SYMBOL(contig_page_data);
35 unsigned long max_low_pfn;
36 unsigned long min_low_pfn;
37 unsigned long max_pfn;
38 unsigned long long max_possible_pfn;
40 static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
45 enum memblock_flags flags = choose_memblock_flags();
47 if (limit > memblock.current_limit)
48 limit = memblock.current_limit;
51 addr = memblock_find_in_range_node(size, align, goal, limit, nid,
53 if (!addr && (flags & MEMBLOCK_MIRROR)) {
54 flags &= ~MEMBLOCK_MIRROR;
55 pr_warn("Could not allocate %pap bytes of mirrored memory\n",
62 if (memblock_reserve(addr, size))
65 ptr = phys_to_virt(addr);
68 * The min_count is set to 0 so that bootmem allocated blocks
69 * are never reported as leaks.
71 kmemleak_alloc(ptr, size, 0, 0);
76 * free_bootmem_late - free bootmem pages directly to page allocator
77 * @addr: starting address of the range
78 * @size: size of the range in bytes
80 * This is only useful when the bootmem allocator has already been torn
81 * down, but we are still initializing the system. Pages are given directly
82 * to the page allocator, no bootmem metadata is updated because it is gone.
84 void __init free_bootmem_late(unsigned long addr, unsigned long size)
86 unsigned long cursor, end;
88 kmemleak_free_part_phys(addr, size);
90 cursor = PFN_UP(addr);
91 end = PFN_DOWN(addr + size);
93 for (; cursor < end; cursor++) {
94 __free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
99 static void __init __free_pages_memory(unsigned long start, unsigned long end)
103 while (start < end) {
104 order = min(MAX_ORDER - 1UL, __ffs(start));
106 while (start + (1UL << order) > end)
109 __free_pages_bootmem(pfn_to_page(start), start, order);
111 start += (1UL << order);
115 static unsigned long __init __free_memory_core(phys_addr_t start,
118 unsigned long start_pfn = PFN_UP(start);
119 unsigned long end_pfn = min_t(unsigned long,
120 PFN_DOWN(end), max_low_pfn);
122 if (start_pfn >= end_pfn)
125 __free_pages_memory(start_pfn, end_pfn);
127 return end_pfn - start_pfn;
130 static unsigned long __init free_low_memory_core_early(void)
132 unsigned long count = 0;
133 phys_addr_t start, end;
136 memblock_clear_hotplug(0, -1);
138 for_each_reserved_mem_region(i, &start, &end)
139 reserve_bootmem_region(start, end);
142 * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
143 * because in some case like Node0 doesn't have RAM installed
144 * low ram will be on Node1
146 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
148 count += __free_memory_core(start, end);
153 static int reset_managed_pages_done __initdata;
155 void reset_node_managed_pages(pg_data_t *pgdat)
159 for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
160 z->managed_pages = 0;
163 void __init reset_all_zones_managed_pages(void)
165 struct pglist_data *pgdat;
167 if (reset_managed_pages_done)
170 for_each_online_pgdat(pgdat)
171 reset_node_managed_pages(pgdat);
173 reset_managed_pages_done = 1;
177 * free_all_bootmem - release free pages to the buddy allocator
179 * Return: the number of pages actually released.
181 unsigned long __init free_all_bootmem(void)
185 reset_all_zones_managed_pages();
187 pages = free_low_memory_core_early();
188 totalram_pages += pages;
194 * free_bootmem_node - mark a page range as usable
195 * @pgdat: node the range resides on
196 * @physaddr: starting physical address of the range
197 * @size: size of the range in bytes
199 * Partial pages will be considered reserved and left as they are.
201 * The range must reside completely on the specified node.
203 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
206 memblock_free(physaddr, size);
210 * free_bootmem - mark a page range as usable
211 * @addr: starting physical address of the range
212 * @size: size of the range in bytes
214 * Partial pages will be considered reserved and left as they are.
216 * The range must be contiguous but may span node boundaries.
218 void __init free_bootmem(unsigned long addr, unsigned long size)
220 memblock_free(addr, size);
223 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
230 if (WARN_ON_ONCE(slab_is_available()))
231 return kzalloc(size, GFP_NOWAIT);
235 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
249 * __alloc_bootmem_nopanic - allocate boot memory without panicking
250 * @size: size of the request in bytes
251 * @align: alignment of the region
252 * @goal: preferred starting address of the region
254 * The goal is dropped if it can not be satisfied and the allocation will
255 * fall back to memory below @goal.
257 * Allocation may happen on any node in the system.
259 * Return: address of the allocated region or %NULL on failure.
261 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
264 unsigned long limit = -1UL;
266 return ___alloc_bootmem_nopanic(size, align, goal, limit);
269 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
270 unsigned long goal, unsigned long limit)
272 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
277 * Whoops, we cannot satisfy the allocation request.
279 pr_alert("bootmem alloc of %lu bytes failed!\n", size);
280 panic("Out of memory");
285 * __alloc_bootmem - allocate boot memory
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 happen on any node in the system.
295 * The function panics if the request can not be satisfied.
297 * Return: address of the allocated region.
299 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
302 unsigned long limit = -1UL;
304 return ___alloc_bootmem(size, align, goal, limit);
307 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
316 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
321 ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
334 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
335 unsigned long align, unsigned long goal)
337 if (WARN_ON_ONCE(slab_is_available()))
338 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
340 return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
343 static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
344 unsigned long align, unsigned long goal,
349 ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
353 pr_alert("bootmem alloc of %lu bytes failed!\n", size);
354 panic("Out of memory");
359 * __alloc_bootmem_node - allocate boot memory from a specific node
360 * @pgdat: node to allocate from
361 * @size: size of the request in bytes
362 * @align: alignment of the region
363 * @goal: preferred starting address of the region
365 * The goal is dropped if it can not be satisfied and the allocation will
366 * fall back to memory below @goal.
368 * Allocation may fall back to any node in the system if the specified node
369 * can not hold the requested memory.
371 * The function panics if the request can not be satisfied.
373 * Return: address of the allocated region.
375 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
376 unsigned long align, unsigned long goal)
378 if (WARN_ON_ONCE(slab_is_available()))
379 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
381 return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
384 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
385 unsigned long align, unsigned long goal)
387 return __alloc_bootmem_node(pgdat, size, align, goal);
392 * __alloc_bootmem_low - allocate low boot memory
393 * @size: size of the request in bytes
394 * @align: alignment of the region
395 * @goal: preferred starting address of the region
397 * The goal is dropped if it can not be satisfied and the allocation will
398 * fall back to memory below @goal.
400 * Allocation may happen on any node in the system.
402 * The function panics if the request can not be satisfied.
404 * Return: address of the allocated region.
406 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
409 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
412 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
416 return ___alloc_bootmem_nopanic(size, align, goal,
417 ARCH_LOW_ADDRESS_LIMIT);
421 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
422 * @pgdat: node to allocate from
423 * @size: size of the request in bytes
424 * @align: alignment of the region
425 * @goal: preferred starting address of the region
427 * The goal is dropped if it can not be satisfied and the allocation will
428 * fall back to memory below @goal.
430 * Allocation may fall back to any node in the system if the specified node
431 * can not hold the requested memory.
433 * The function panics if the request can not be satisfied.
435 * Return: address of the allocated region.
437 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
438 unsigned long align, unsigned long goal)
440 if (WARN_ON_ONCE(slab_is_available()))
441 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
443 return ___alloc_bootmem_node(pgdat, size, align, goal,
444 ARCH_LOW_ADDRESS_LIMIT);