446 строки
11 KiB
C
446 строки
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* bootmem - A boot-time physical memory allocator and configurator
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*
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* Copyright (C) 1999 Ingo Molnar
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* 1999 Kanoj Sarcar, SGI
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* 2008 Johannes Weiner
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*
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* Access to this subsystem has to be serialized externally (which is true
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* for the boot process anyway).
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*/
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#include <linux/init.h>
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#include <linux/pfn.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/kmemleak.h>
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#include <linux/range.h>
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#include <linux/memblock.h>
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#include <linux/bootmem.h>
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#include <asm/bug.h>
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#include <asm/io.h>
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#include "internal.h"
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#ifndef CONFIG_HAVE_MEMBLOCK
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#error CONFIG_HAVE_MEMBLOCK not defined
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#endif
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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struct pglist_data __refdata contig_page_data;
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EXPORT_SYMBOL(contig_page_data);
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#endif
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unsigned long max_low_pfn;
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unsigned long min_low_pfn;
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unsigned long max_pfn;
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unsigned long long max_possible_pfn;
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static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
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u64 goal, u64 limit)
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{
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void *ptr;
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u64 addr;
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enum memblock_flags flags = choose_memblock_flags();
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if (limit > memblock.current_limit)
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limit = memblock.current_limit;
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again:
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addr = memblock_find_in_range_node(size, align, goal, limit, nid,
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flags);
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if (!addr && (flags & MEMBLOCK_MIRROR)) {
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flags &= ~MEMBLOCK_MIRROR;
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pr_warn("Could not allocate %pap bytes of mirrored memory\n",
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&size);
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goto again;
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}
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if (!addr)
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return NULL;
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if (memblock_reserve(addr, size))
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return NULL;
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ptr = phys_to_virt(addr);
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memset(ptr, 0, size);
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/*
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* The min_count is set to 0 so that bootmem allocated blocks
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* are never reported as leaks.
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*/
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kmemleak_alloc(ptr, size, 0, 0);
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return ptr;
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}
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/**
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* free_bootmem_late - free bootmem pages directly to page allocator
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* @addr: starting address of the range
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* @size: size of the range in bytes
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*
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* This is only useful when the bootmem allocator has already been torn
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* down, but we are still initializing the system. Pages are given directly
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* to the page allocator, no bootmem metadata is updated because it is gone.
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*/
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void __init free_bootmem_late(unsigned long addr, unsigned long size)
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{
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unsigned long cursor, end;
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kmemleak_free_part_phys(addr, size);
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cursor = PFN_UP(addr);
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end = PFN_DOWN(addr + size);
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for (; cursor < end; cursor++) {
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__free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
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totalram_pages++;
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}
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}
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static void __init __free_pages_memory(unsigned long start, unsigned long end)
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{
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int order;
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while (start < end) {
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order = min(MAX_ORDER - 1UL, __ffs(start));
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while (start + (1UL << order) > end)
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order--;
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__free_pages_bootmem(pfn_to_page(start), start, order);
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start += (1UL << order);
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}
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}
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static unsigned long __init __free_memory_core(phys_addr_t start,
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phys_addr_t end)
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{
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unsigned long start_pfn = PFN_UP(start);
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unsigned long end_pfn = min_t(unsigned long,
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PFN_DOWN(end), max_low_pfn);
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if (start_pfn >= end_pfn)
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return 0;
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__free_pages_memory(start_pfn, end_pfn);
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return end_pfn - start_pfn;
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}
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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;
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u64 i;
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memblock_clear_hotplug(0, -1);
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for_each_reserved_mem_region(i, &start, &end)
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reserve_bootmem_region(start, end);
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/*
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* We need to use NUMA_NO_NODE 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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for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
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NULL)
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count += __free_memory_core(start, end);
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return count;
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}
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static int reset_managed_pages_done __initdata;
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void reset_node_managed_pages(pg_data_t *pgdat)
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{
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struct zone *z;
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for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
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z->managed_pages = 0;
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}
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void __init reset_all_zones_managed_pages(void)
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{
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struct pglist_data *pgdat;
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if (reset_managed_pages_done)
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return;
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for_each_online_pgdat(pgdat)
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reset_node_managed_pages(pgdat);
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reset_managed_pages_done = 1;
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}
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/**
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* free_all_bootmem - release free pages to the buddy allocator
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*
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* Return: the number of pages actually released.
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*/
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unsigned long __init free_all_bootmem(void)
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{
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unsigned long pages;
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reset_all_zones_managed_pages();
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pages = free_low_memory_core_early();
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totalram_pages += pages;
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return pages;
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}
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/**
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* free_bootmem_node - mark a page range as usable
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* @pgdat: node the range resides on
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* @physaddr: starting physical address of the range
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* @size: size of the range in bytes
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*
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* Partial pages will be considered reserved and left as they are.
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*
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* The range must reside completely on the specified node.
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*/
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void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
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unsigned long size)
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{
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memblock_free(physaddr, size);
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}
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/**
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* free_bootmem - mark a page range as usable
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* @addr: starting physical address of the range
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* @size: size of the range in bytes
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*
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* Partial pages will be considered reserved and left as they are.
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*
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* The range must be contiguous but may span node boundaries.
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*/
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void __init free_bootmem(unsigned long addr, unsigned long size)
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{
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memblock_free(addr, size);
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}
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static void * __init ___alloc_bootmem_nopanic(unsigned long size,
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unsigned long align,
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unsigned long goal,
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unsigned long limit)
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{
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void *ptr;
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if (WARN_ON_ONCE(slab_is_available()))
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return kzalloc(size, GFP_NOWAIT);
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restart:
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ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align, goal, limit);
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if (ptr)
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return ptr;
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if (goal != 0) {
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goal = 0;
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goto restart;
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}
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return NULL;
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}
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/**
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* __alloc_bootmem_nopanic - allocate boot memory without panicking
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* @size: size of the request in bytes
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* @align: alignment of the region
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* @goal: preferred starting address of the region
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*
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* The goal is dropped if it can not be satisfied and the allocation will
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* fall back to memory below @goal.
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*
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* Allocation may happen on any node in the system.
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*
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* Return: address of the allocated region or %NULL on failure.
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*/
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void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
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unsigned long goal)
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{
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unsigned long limit = -1UL;
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return ___alloc_bootmem_nopanic(size, align, goal, limit);
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}
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static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
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unsigned long goal, unsigned long limit)
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{
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void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
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if (mem)
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return mem;
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/*
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* Whoops, we cannot satisfy the allocation request.
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*/
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pr_alert("bootmem alloc of %lu bytes failed!\n", size);
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panic("Out of memory");
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return NULL;
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}
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/**
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* __alloc_bootmem - allocate boot memory
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* @size: size of the request in bytes
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* @align: alignment of the region
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* @goal: preferred starting address of the region
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*
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* The goal is dropped if it can not be satisfied and the allocation will
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* fall back to memory below @goal.
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*
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* Allocation may happen on any node in the system.
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*
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* The function panics if the request can not be satisfied.
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*
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* Return: address of the allocated region.
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*/
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void * __init __alloc_bootmem(unsigned long size, unsigned long align,
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unsigned long goal)
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{
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unsigned long limit = -1UL;
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return ___alloc_bootmem(size, align, goal, limit);
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}
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void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
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unsigned long size,
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unsigned long align,
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unsigned long goal,
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unsigned long limit)
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{
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void *ptr;
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again:
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ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
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goal, limit);
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if (ptr)
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return ptr;
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ptr = __alloc_memory_core_early(NUMA_NO_NODE, size, align,
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goal, limit);
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if (ptr)
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return ptr;
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if (goal) {
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goal = 0;
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goto again;
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}
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return NULL;
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}
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void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
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unsigned long align, unsigned long goal)
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{
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if (WARN_ON_ONCE(slab_is_available()))
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return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
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return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
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}
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static void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
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unsigned long align, unsigned long goal,
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unsigned long limit)
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{
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void *ptr;
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ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
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if (ptr)
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return ptr;
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pr_alert("bootmem alloc of %lu bytes failed!\n", size);
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panic("Out of memory");
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return NULL;
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}
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/**
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* __alloc_bootmem_node - allocate boot memory from a specific node
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* @pgdat: node to allocate from
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* @size: size of the request in bytes
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* @align: alignment of the region
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* @goal: preferred starting address of the region
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*
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* The goal is dropped if it can not be satisfied and the allocation will
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* fall back to memory below @goal.
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*
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* Allocation may fall back to any node in the system if the specified node
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* can not hold the requested memory.
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*
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* The function panics if the request can not be satisfied.
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*
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* Return: address of the allocated region.
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*/
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void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
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unsigned long align, unsigned long goal)
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{
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if (WARN_ON_ONCE(slab_is_available()))
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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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}
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void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
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unsigned long align, unsigned long goal)
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{
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return __alloc_bootmem_node(pgdat, size, align, goal);
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}
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/**
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* __alloc_bootmem_low - allocate low boot memory
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* @size: size of the request in bytes
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* @align: alignment of the region
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* @goal: preferred starting address of the region
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*
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* The goal is dropped if it can not be satisfied and the allocation will
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* fall back to memory below @goal.
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*
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* Allocation may happen on any node in the system.
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*
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* The function panics if the request can not be satisfied.
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*
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* Return: address of the allocated region.
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*/
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void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
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unsigned long goal)
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{
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return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
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}
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void * __init __alloc_bootmem_low_nopanic(unsigned long size,
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unsigned long align,
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unsigned long goal)
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{
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return ___alloc_bootmem_nopanic(size, align, goal,
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ARCH_LOW_ADDRESS_LIMIT);
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}
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/**
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* __alloc_bootmem_low_node - allocate low boot memory from a specific node
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* @pgdat: node to allocate from
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* @size: size of the request in bytes
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* @align: alignment of the region
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* @goal: preferred starting address of the region
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*
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* The goal is dropped if it can not be satisfied and the allocation will
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* fall back to memory below @goal.
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*
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* Allocation may fall back to any node in the system if the specified node
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* can not hold the requested memory.
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*
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* The function panics if the request can not be satisfied.
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*
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* Return: address of the allocated region.
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*/
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void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
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unsigned long align, unsigned long goal)
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{
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if (WARN_ON_ONCE(slab_is_available()))
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return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
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return ___alloc_bootmem_node(pgdat, size, align, goal,
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ARCH_LOW_ADDRESS_LIMIT);
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}
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