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mm/nobootmem.c
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/* * bootmem - A boot-time physical memory allocator and configurator * * Copyright (C) 1999 Ingo Molnar * 1999 Kanoj Sarcar, SGI * 2008 Johannes Weiner * * Access to this subsystem has to be serialized externally (which is true * for the boot process anyway). */ #include <linux/init.h> #include <linux/pfn.h> #include <linux/slab.h> #include <linux/bootmem.h> |
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#include <linux/export.h> |
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#include <linux/kmemleak.h> #include <linux/range.h> #include <linux/memblock.h> #include <asm/bug.h> #include <asm/io.h> #include <asm/processor.h> #include "internal.h" |
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#ifndef CONFIG_NEED_MULTIPLE_NODES struct pglist_data __refdata contig_page_data; EXPORT_SYMBOL(contig_page_data); #endif |
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unsigned long max_low_pfn; unsigned long min_low_pfn; unsigned long max_pfn; |
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static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align, u64 goal, u64 limit) { void *ptr; u64 addr; if (limit > memblock.current_limit) limit = memblock.current_limit; |
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addr = memblock_find_in_range_node(goal, limit, size, align, nid); |
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if (!addr) |
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return NULL; |
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memblock_reserve(addr, size); |
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ptr = phys_to_virt(addr); memset(ptr, 0, size); |
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/* * The min_count is set to 0 so that bootmem allocated blocks * are never reported as leaks. */ kmemleak_alloc(ptr, size, 0, 0); return ptr; } |
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/* * free_bootmem_late - free bootmem pages directly to page allocator * @addr: starting address of the range * @size: size of the range in bytes * * This is only useful when the bootmem allocator has already been torn * down, but we are still initializing the system. Pages are given directly * to the page allocator, no bootmem metadata is updated because it is gone. */ void __init free_bootmem_late(unsigned long addr, unsigned long size) { unsigned long cursor, end; kmemleak_free_part(__va(addr), size); cursor = PFN_UP(addr); end = PFN_DOWN(addr + size); for (; cursor < end; cursor++) { __free_pages_bootmem(pfn_to_page(cursor), 0); totalram_pages++; } } static void __init __free_pages_memory(unsigned long start, unsigned long end) { |
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unsigned long i, start_aligned, end_aligned; |
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int order = ilog2(BITS_PER_LONG); start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1); end_aligned = end & ~(BITS_PER_LONG - 1); if (end_aligned <= start_aligned) { for (i = start; i < end; i++) __free_pages_bootmem(pfn_to_page(i), 0); return; } for (i = start; i < start_aligned; i++) __free_pages_bootmem(pfn_to_page(i), 0); for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG) __free_pages_bootmem(pfn_to_page(i), order); for (i = end_aligned; i < end; i++) __free_pages_bootmem(pfn_to_page(i), 0); } |
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static unsigned long __init __free_memory_core(phys_addr_t start, phys_addr_t end) { unsigned long start_pfn = PFN_UP(start); unsigned long end_pfn = min_t(unsigned long, PFN_DOWN(end), max_low_pfn); if (start_pfn > end_pfn) return 0; __free_pages_memory(start_pfn, end_pfn); return end_pfn - start_pfn; } |
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static unsigned long __init free_low_memory_core_early(void) |
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{ |
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unsigned long count = 0; |
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phys_addr_t start, end, size; |
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u64 i; |
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for_each_free_mem_range(i, MAX_NUMNODES, &start, &end, NULL) count += __free_memory_core(start, end); /* free range that is used for reserved array if we allocate it */ size = get_allocated_memblock_reserved_regions_info(&start); if (size) count += __free_memory_core(start, start + size); |
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return count; } |
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static void reset_node_lowmem_managed_pages(pg_data_t *pgdat) { struct zone *z; /* * In free_area_init_core(), highmem zone's managed_pages is set to * present_pages, and bootmem allocator doesn't allocate from highmem * zones. So there's no need to recalculate managed_pages because all * highmem pages will be managed by the buddy system. Here highmem * zone also includes highmem movable zone. */ for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) if (!is_highmem(z)) z->managed_pages = 0; } |
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/** |
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* free_all_bootmem - release free pages to the buddy allocator * * Returns the number of pages actually released. */ unsigned long __init free_all_bootmem(void) { |
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struct pglist_data *pgdat; for_each_online_pgdat(pgdat) reset_node_lowmem_managed_pages(pgdat); |
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/* * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id |
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* because in some case like Node0 doesn't have RAM installed |
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* low ram will be on Node1 |
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*/ |
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return free_low_memory_core_early(); |
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} /** * free_bootmem_node - mark a page range as usable * @pgdat: node the range resides on * @physaddr: starting address of the range * @size: size of the range in bytes * * Partial pages will be considered reserved and left as they are. * * The range must reside completely on the specified node. */ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, unsigned long size) { kmemleak_free_part(__va(physaddr), size); |
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memblock_free(physaddr, size); |
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} /** * free_bootmem - mark a page range as usable * @addr: starting address of the range * @size: size of the range in bytes * * Partial pages will be considered reserved and left as they are. * * The range must be contiguous but may span node boundaries. */ void __init free_bootmem(unsigned long addr, unsigned long size) { kmemleak_free_part(__va(addr), size); |
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memblock_free(addr, size); |
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} static void * __init ___alloc_bootmem_nopanic(unsigned long size, unsigned long align, unsigned long goal, unsigned long limit) { void *ptr; if (WARN_ON_ONCE(slab_is_available())) return kzalloc(size, GFP_NOWAIT); restart: ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit); if (ptr) return ptr; if (goal != 0) { goal = 0; goto restart; } return NULL; } /** * __alloc_bootmem_nopanic - allocate boot memory without panicking * @size: size of the request in bytes * @align: alignment of the region * @goal: preferred starting address of the region * * The goal is dropped if it can not be satisfied and the allocation will * fall back to memory below @goal. * * Allocation may happen on any node in the system. * * Returns NULL on failure. */ void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, unsigned long goal) { unsigned long limit = -1UL; return ___alloc_bootmem_nopanic(size, align, goal, limit); } static void * __init ___alloc_bootmem(unsigned long size, unsigned long align, unsigned long goal, unsigned long limit) { void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit); if (mem) return mem; /* * Whoops, we cannot satisfy the allocation request. */ printk(KERN_ALERT "bootmem alloc of %lu bytes failed! ", size); panic("Out of memory"); return NULL; } /** * __alloc_bootmem - allocate boot memory * @size: size of the request in bytes * @align: alignment of the region * @goal: preferred starting address of the region * * The goal is dropped if it can not be satisfied and the allocation will * fall back to memory below @goal. * * Allocation may happen on any node in the system. * * The function panics if the request can not be satisfied. */ void * __init __alloc_bootmem(unsigned long size, unsigned long align, unsigned long goal) { unsigned long limit = -1UL; return ___alloc_bootmem(size, align, goal, limit); } |
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void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat, |
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unsigned long size, unsigned long align, unsigned long goal, unsigned long limit) { void *ptr; again: ptr = __alloc_memory_core_early(pgdat->node_id, size, align, goal, limit); if (ptr) return ptr; ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit); if (ptr) return ptr; if (goal) { goal = 0; goto again; } return NULL; } void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal) { if (WARN_ON_ONCE(slab_is_available())) return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0); } void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal, unsigned long limit) { void *ptr; ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit); if (ptr) return ptr; printk(KERN_ALERT "bootmem alloc of %lu bytes failed! ", size); panic("Out of memory"); return NULL; } |
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/** * __alloc_bootmem_node - allocate boot memory from a specific node * @pgdat: node to allocate from * @size: size of the request in bytes * @align: alignment of the region * @goal: preferred starting address of the region * * The goal is dropped if it can not be satisfied and the allocation will * fall back to memory below @goal. * * Allocation may fall back to any node in the system if the specified node * can not hold the requested memory. * * The function panics if the request can not be satisfied. */ void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal) { |
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if (WARN_ON_ONCE(slab_is_available())) return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
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return ___alloc_bootmem_node(pgdat, size, align, goal, 0); |
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} void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal) { |
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return __alloc_bootmem_node(pgdat, size, align, goal); |
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} |
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#ifndef ARCH_LOW_ADDRESS_LIMIT #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL #endif /** * __alloc_bootmem_low - allocate low boot memory * @size: size of the request in bytes * @align: alignment of the region * @goal: preferred starting address of the region * * The goal is dropped if it can not be satisfied and the allocation will * fall back to memory below @goal. * * Allocation may happen on any node in the system. * * The function panics if the request can not be satisfied. */ void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, unsigned long goal) { return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); } |
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void * __init __alloc_bootmem_low_nopanic(unsigned long size, unsigned long align, unsigned long goal) { return ___alloc_bootmem_nopanic(size, align, goal, ARCH_LOW_ADDRESS_LIMIT); } |
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/** * __alloc_bootmem_low_node - allocate low boot memory from a specific node * @pgdat: node to allocate from * @size: size of the request in bytes * @align: alignment of the region * @goal: preferred starting address of the region * * The goal is dropped if it can not be satisfied and the allocation will * fall back to memory below @goal. * * Allocation may fall back to any node in the system if the specified node * can not hold the requested memory. * * The function panics if the request can not be satisfied. */ void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal) { |
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if (WARN_ON_ONCE(slab_is_available())) return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); |
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return ___alloc_bootmem_node(pgdat, size, align, goal, ARCH_LOW_ADDRESS_LIMIT); |
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} |