5e70982750
show_mem() was not correctly handling holes in the memory map. It was treating the freed sections of the map as though they contained valid struct page entries. This could cause incorrect debugging output or even a kernel panic. This patch keeps the struct meminfo around after system initialization so that show_mem() can use it when scanning memory. show_mem() now walks over each bank of each online node, rather than assuming that each node contains a single contiguous bank. Signed-off-by: Ray Lehtiniemi <rayl@mail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
504 lines
12 KiB
C
504 lines
12 KiB
C
/*
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* linux/arch/arm/mm/init.c
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*
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* Copyright (C) 1995-2005 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/mman.h>
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#include <linux/nodemask.h>
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#include <linux/initrd.h>
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#include <asm/mach-types.h>
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#include <asm/setup.h>
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#include <asm/sizes.h>
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#include <asm/tlb.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include "mm.h"
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extern void _text, _etext, __data_start, _end, __init_begin, __init_end;
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extern unsigned long phys_initrd_start;
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extern unsigned long phys_initrd_size;
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/*
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* This is used to pass memory configuration data from paging_init
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* to mem_init, and by show_mem() to skip holes in the memory map.
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*/
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static struct meminfo meminfo = { 0, };
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#define for_each_nodebank(iter,mi,no) \
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for (iter = 0; iter < mi->nr_banks; iter++) \
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if (mi->bank[iter].node == no)
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void show_mem(void)
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{
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int free = 0, total = 0, reserved = 0;
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int shared = 0, cached = 0, slab = 0, node, i;
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struct meminfo * mi = &meminfo;
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printk("Mem-info:\n");
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show_free_areas();
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printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
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for_each_online_node(node) {
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for_each_nodebank (i,mi,node) {
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unsigned int pfn1, pfn2;
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struct page *page, *end;
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pfn1 = mi->bank[i].start >> PAGE_SHIFT;
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pfn2 = (mi->bank[i].size + mi->bank[i].start) >> PAGE_SHIFT;
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page = NODE_MEM_MAP(node) + pfn1;
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end = NODE_MEM_MAP(node) + pfn2;
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do {
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total++;
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if (PageReserved(page))
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reserved++;
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else if (PageSwapCache(page))
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cached++;
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else if (PageSlab(page))
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slab++;
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else if (!page_count(page))
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free++;
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else
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shared += page_count(page) - 1;
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page++;
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} while (page < end);
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}
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}
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printk("%d pages of RAM\n", total);
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printk("%d free pages\n", free);
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printk("%d reserved pages\n", reserved);
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printk("%d slab pages\n", slab);
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printk("%d pages shared\n", shared);
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printk("%d pages swap cached\n", cached);
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}
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/*
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* FIXME: We really want to avoid allocating the bootmap bitmap
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* over the top of the initrd. Hopefully, this is located towards
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* the start of a bank, so if we allocate the bootmap bitmap at
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* the end, we won't clash.
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*/
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static unsigned int __init
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find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
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{
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unsigned int start_pfn, bank, bootmap_pfn;
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start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT;
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bootmap_pfn = 0;
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for_each_nodebank(bank, mi, node) {
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unsigned int start, end;
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start = mi->bank[bank].start >> PAGE_SHIFT;
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end = (mi->bank[bank].size +
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mi->bank[bank].start) >> PAGE_SHIFT;
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if (end < start_pfn)
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continue;
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if (start < start_pfn)
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start = start_pfn;
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if (end <= start)
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continue;
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if (end - start >= bootmap_pages) {
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bootmap_pfn = start;
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break;
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}
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}
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if (bootmap_pfn == 0)
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BUG();
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return bootmap_pfn;
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}
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static int __init check_initrd(struct meminfo *mi)
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{
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int initrd_node = -2;
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#ifdef CONFIG_BLK_DEV_INITRD
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unsigned long end = phys_initrd_start + phys_initrd_size;
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/*
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* Make sure that the initrd is within a valid area of
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* memory.
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*/
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if (phys_initrd_size) {
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unsigned int i;
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initrd_node = -1;
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for (i = 0; i < mi->nr_banks; i++) {
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unsigned long bank_end;
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bank_end = mi->bank[i].start + mi->bank[i].size;
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if (mi->bank[i].start <= phys_initrd_start &&
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end <= bank_end)
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initrd_node = mi->bank[i].node;
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}
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}
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if (initrd_node == -1) {
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printk(KERN_ERR "initrd (0x%08lx - 0x%08lx) extends beyond "
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"physical memory - disabling initrd\n",
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phys_initrd_start, end);
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phys_initrd_start = phys_initrd_size = 0;
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}
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#endif
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return initrd_node;
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}
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static inline void map_memory_bank(struct membank *bank)
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{
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#ifdef CONFIG_MMU
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struct map_desc map;
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map.pfn = __phys_to_pfn(bank->start);
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map.virtual = __phys_to_virt(bank->start);
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map.length = bank->size;
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map.type = MT_MEMORY;
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create_mapping(&map);
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#endif
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}
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static unsigned long __init
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bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
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{
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unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
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unsigned long start_pfn, end_pfn, boot_pfn;
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unsigned int boot_pages;
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pg_data_t *pgdat;
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int i;
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start_pfn = -1UL;
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end_pfn = 0;
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/*
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* Calculate the pfn range, and map the memory banks for this node.
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*/
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for_each_nodebank(i, mi, node) {
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struct membank *bank = &mi->bank[i];
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unsigned long start, end;
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start = bank->start >> PAGE_SHIFT;
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end = (bank->start + bank->size) >> PAGE_SHIFT;
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if (start_pfn > start)
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start_pfn = start;
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if (end_pfn < end)
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end_pfn = end;
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map_memory_bank(bank);
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}
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/*
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* If there is no memory in this node, ignore it.
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*/
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if (end_pfn == 0)
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return end_pfn;
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/*
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* Allocate the bootmem bitmap page.
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*/
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boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
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boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
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/*
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* Initialise the bootmem allocator for this node, handing the
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* memory banks over to bootmem.
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*/
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node_set_online(node);
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pgdat = NODE_DATA(node);
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init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
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for_each_nodebank(i, mi, node)
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free_bootmem_node(pgdat, mi->bank[i].start, mi->bank[i].size);
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/*
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* Reserve the bootmem bitmap for this node.
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*/
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reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
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boot_pages << PAGE_SHIFT);
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#ifdef CONFIG_BLK_DEV_INITRD
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/*
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* If the initrd is in this node, reserve its memory.
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*/
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if (node == initrd_node) {
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reserve_bootmem_node(pgdat, phys_initrd_start,
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phys_initrd_size);
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initrd_start = __phys_to_virt(phys_initrd_start);
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initrd_end = initrd_start + phys_initrd_size;
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}
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#endif
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/*
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* Finally, reserve any node zero regions.
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*/
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if (node == 0)
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reserve_node_zero(pgdat);
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/*
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* initialise the zones within this node.
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*/
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memset(zone_size, 0, sizeof(zone_size));
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memset(zhole_size, 0, sizeof(zhole_size));
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/*
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* The size of this node has already been determined. If we need
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* to do anything fancy with the allocation of this memory to the
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* zones, now is the time to do it.
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*/
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zone_size[0] = end_pfn - start_pfn;
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/*
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* For each bank in this node, calculate the size of the holes.
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* holes = node_size - sum(bank_sizes_in_node)
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*/
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zhole_size[0] = zone_size[0];
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for_each_nodebank(i, mi, node)
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zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT;
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/*
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* Adjust the sizes according to any special requirements for
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* this machine type.
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*/
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arch_adjust_zones(node, zone_size, zhole_size);
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free_area_init_node(node, pgdat, zone_size, start_pfn, zhole_size);
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return end_pfn;
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}
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void __init bootmem_init(struct meminfo *mi)
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{
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unsigned long memend_pfn = 0;
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int node, initrd_node, i;
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/*
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* Invalidate the node number for empty or invalid memory banks
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*/
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for (i = 0; i < mi->nr_banks; i++)
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if (mi->bank[i].size == 0 || mi->bank[i].node >= MAX_NUMNODES)
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mi->bank[i].node = -1;
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memcpy(&meminfo, mi, sizeof(meminfo));
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/*
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* Locate which node contains the ramdisk image, if any.
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*/
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initrd_node = check_initrd(mi);
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/*
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* Run through each node initialising the bootmem allocator.
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*/
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for_each_node(node) {
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unsigned long end_pfn;
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end_pfn = bootmem_init_node(node, initrd_node, mi);
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/*
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* Remember the highest memory PFN.
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*/
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if (end_pfn > memend_pfn)
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memend_pfn = end_pfn;
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}
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high_memory = __va(memend_pfn << PAGE_SHIFT);
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/*
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* This doesn't seem to be used by the Linux memory manager any
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* more, but is used by ll_rw_block. If we can get rid of it, we
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* also get rid of some of the stuff above as well.
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*
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* Note: max_low_pfn and max_pfn reflect the number of _pages_ in
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* the system, not the maximum PFN.
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*/
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max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET;
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}
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static inline void free_area(unsigned long addr, unsigned long end, char *s)
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{
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unsigned int size = (end - addr) >> 10;
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for (; addr < end; addr += PAGE_SIZE) {
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struct page *page = virt_to_page(addr);
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ClearPageReserved(page);
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init_page_count(page);
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free_page(addr);
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totalram_pages++;
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}
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if (size && s)
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printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
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}
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static inline void
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free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
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{
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struct page *start_pg, *end_pg;
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unsigned long pg, pgend;
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/*
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* Convert start_pfn/end_pfn to a struct page pointer.
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*/
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start_pg = pfn_to_page(start_pfn);
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end_pg = pfn_to_page(end_pfn);
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/*
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* Convert to physical addresses, and
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* round start upwards and end downwards.
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*/
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pg = PAGE_ALIGN(__pa(start_pg));
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pgend = __pa(end_pg) & PAGE_MASK;
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/*
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* If there are free pages between these,
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* free the section of the memmap array.
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*/
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if (pg < pgend)
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free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
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}
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/*
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* The mem_map array can get very big. Free the unused area of the memory map.
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*/
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static void __init free_unused_memmap_node(int node, struct meminfo *mi)
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{
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unsigned long bank_start, prev_bank_end = 0;
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unsigned int i;
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/*
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* [FIXME] This relies on each bank being in address order. This
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* may not be the case, especially if the user has provided the
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* information on the command line.
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*/
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for_each_nodebank(i, mi, node) {
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bank_start = mi->bank[i].start >> PAGE_SHIFT;
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if (bank_start < prev_bank_end) {
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printk(KERN_ERR "MEM: unordered memory banks. "
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"Not freeing memmap.\n");
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break;
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}
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/*
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* If we had a previous bank, and there is a space
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* between the current bank and the previous, free it.
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*/
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if (prev_bank_end && prev_bank_end != bank_start)
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free_memmap(node, prev_bank_end, bank_start);
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prev_bank_end = (mi->bank[i].start +
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mi->bank[i].size) >> PAGE_SHIFT;
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}
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}
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/*
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* mem_init() marks the free areas in the mem_map and tells us how much
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* memory is free. This is done after various parts of the system have
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* claimed their memory after the kernel image.
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*/
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void __init mem_init(void)
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{
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unsigned int codepages, datapages, initpages;
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int i, node;
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codepages = &_etext - &_text;
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datapages = &_end - &__data_start;
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initpages = &__init_end - &__init_begin;
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#ifndef CONFIG_DISCONTIGMEM
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max_mapnr = virt_to_page(high_memory) - mem_map;
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#endif
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/* this will put all unused low memory onto the freelists */
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for_each_online_node(node) {
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pg_data_t *pgdat = NODE_DATA(node);
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free_unused_memmap_node(node, &meminfo);
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if (pgdat->node_spanned_pages != 0)
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totalram_pages += free_all_bootmem_node(pgdat);
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}
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#ifdef CONFIG_SA1111
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/* now that our DMA memory is actually so designated, we can free it */
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free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL);
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#endif
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/*
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* Since our memory may not be contiguous, calculate the
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* real number of pages we have in this system
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*/
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printk(KERN_INFO "Memory:");
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num_physpages = 0;
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for (i = 0; i < meminfo.nr_banks; i++) {
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num_physpages += meminfo.bank[i].size >> PAGE_SHIFT;
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printk(" %ldMB", meminfo.bank[i].size >> 20);
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}
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printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
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printk(KERN_NOTICE "Memory: %luKB available (%dK code, "
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"%dK data, %dK init)\n",
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(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
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codepages >> 10, datapages >> 10, initpages >> 10);
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if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
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extern int sysctl_overcommit_memory;
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/*
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* On a machine this small we won't get
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* anywhere without overcommit, so turn
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* it on by default.
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*/
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sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
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}
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}
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void free_initmem(void)
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{
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if (!machine_is_integrator() && !machine_is_cintegrator()) {
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free_area((unsigned long)(&__init_begin),
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(unsigned long)(&__init_end),
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"init");
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}
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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static int keep_initrd;
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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if (!keep_initrd)
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free_area(start, end, "initrd");
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}
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static int __init keepinitrd_setup(char *__unused)
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{
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keep_initrd = 1;
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return 1;
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}
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__setup("keepinitrd", keepinitrd_setup);
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#endif
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