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![Johannes Weiner](/assets/img/avatar_default.png)
Moving the request details print-out before the sanity checks that might panic() enables us to analyse invalid requests without having access to the line information of the stack dump. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
727 lines
18 KiB
C
727 lines
18 KiB
C
/*
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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/bootmem.h>
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#include <linux/module.h>
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#include <asm/bug.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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#include "internal.h"
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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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#ifdef CONFIG_CRASH_DUMP
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/*
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* If we have booted due to a crash, max_pfn will be a very low value. We need
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* to know the amount of memory that the previous kernel used.
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*/
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unsigned long saved_max_pfn;
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#endif
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bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
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static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
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static int bootmem_debug;
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static int __init bootmem_debug_setup(char *buf)
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{
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bootmem_debug = 1;
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return 0;
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}
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early_param("bootmem_debug", bootmem_debug_setup);
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#define bdebug(fmt, args...) ({ \
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if (unlikely(bootmem_debug)) \
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printk(KERN_INFO \
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"bootmem::%s " fmt, \
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__func__, ## args); \
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})
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static unsigned long __init bootmap_bytes(unsigned long pages)
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{
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unsigned long bytes = (pages + 7) / 8;
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return ALIGN(bytes, sizeof(long));
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}
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/**
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* bootmem_bootmap_pages - calculate bitmap size in pages
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* @pages: number of pages the bitmap has to represent
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*/
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unsigned long __init bootmem_bootmap_pages(unsigned long pages)
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{
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unsigned long bytes = bootmap_bytes(pages);
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return PAGE_ALIGN(bytes) >> PAGE_SHIFT;
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}
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/*
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* link bdata in order
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*/
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static void __init link_bootmem(bootmem_data_t *bdata)
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{
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struct list_head *iter;
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list_for_each(iter, &bdata_list) {
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bootmem_data_t *ent;
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ent = list_entry(iter, bootmem_data_t, list);
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if (bdata->node_min_pfn < ent->node_min_pfn)
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break;
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}
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list_add_tail(&bdata->list, iter);
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}
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/*
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* Called once to set up the allocator itself.
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*/
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static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
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unsigned long mapstart, unsigned long start, unsigned long end)
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{
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unsigned long mapsize;
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mminit_validate_memmodel_limits(&start, &end);
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bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
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bdata->node_min_pfn = start;
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bdata->node_low_pfn = end;
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link_bootmem(bdata);
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/*
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* Initially all pages are reserved - setup_arch() has to
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* register free RAM areas explicitly.
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*/
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mapsize = bootmap_bytes(end - start);
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memset(bdata->node_bootmem_map, 0xff, mapsize);
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bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
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bdata - bootmem_node_data, start, mapstart, end, mapsize);
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return mapsize;
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}
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/**
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* init_bootmem_node - register a node as boot memory
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* @pgdat: node to register
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* @freepfn: pfn where the bitmap for this node is to be placed
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* @startpfn: first pfn on the node
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* @endpfn: first pfn after the node
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*
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* Returns the number of bytes needed to hold the bitmap for this node.
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*/
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unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
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unsigned long startpfn, unsigned long endpfn)
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{
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return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn);
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}
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/**
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* init_bootmem - register boot memory
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* @start: pfn where the bitmap is to be placed
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* @pages: number of available physical pages
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*
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* Returns the number of bytes needed to hold the bitmap.
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*/
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unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
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{
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max_low_pfn = pages;
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min_low_pfn = start;
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return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages);
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}
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static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
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{
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int aligned;
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struct page *page;
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unsigned long start, end, pages, count = 0;
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if (!bdata->node_bootmem_map)
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return 0;
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start = bdata->node_min_pfn;
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end = bdata->node_low_pfn;
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/*
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* If the start is aligned to the machines wordsize, we might
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* be able to free pages in bulks of that order.
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*/
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aligned = !(start & (BITS_PER_LONG - 1));
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bdebug("nid=%td start=%lx end=%lx aligned=%d\n",
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bdata - bootmem_node_data, start, end, aligned);
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while (start < end) {
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unsigned long *map, idx, vec;
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map = bdata->node_bootmem_map;
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idx = start - bdata->node_min_pfn;
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vec = ~map[idx / BITS_PER_LONG];
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if (aligned && vec == ~0UL && start + BITS_PER_LONG < end) {
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int order = ilog2(BITS_PER_LONG);
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__free_pages_bootmem(pfn_to_page(start), order);
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count += BITS_PER_LONG;
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} else {
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unsigned long off = 0;
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while (vec && off < BITS_PER_LONG) {
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if (vec & 1) {
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page = pfn_to_page(start + off);
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__free_pages_bootmem(page, 0);
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count++;
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}
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vec >>= 1;
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off++;
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}
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}
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start += BITS_PER_LONG;
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}
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page = virt_to_page(bdata->node_bootmem_map);
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pages = bdata->node_low_pfn - bdata->node_min_pfn;
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pages = bootmem_bootmap_pages(pages);
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count += pages;
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while (pages--)
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__free_pages_bootmem(page++, 0);
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bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
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return count;
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}
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/**
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* free_all_bootmem_node - release a node's free pages to the buddy allocator
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* @pgdat: node to be released
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*
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* Returns the number of pages actually released.
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*/
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unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
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{
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register_page_bootmem_info_node(pgdat);
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return free_all_bootmem_core(pgdat->bdata);
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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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* Returns 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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return free_all_bootmem_core(NODE_DATA(0)->bdata);
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}
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static void __init __free(bootmem_data_t *bdata,
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unsigned long sidx, unsigned long eidx)
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{
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unsigned long idx;
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bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
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sidx + bdata->node_min_pfn,
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eidx + bdata->node_min_pfn);
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if (bdata->hint_idx > sidx)
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bdata->hint_idx = sidx;
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for (idx = sidx; idx < eidx; idx++)
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if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
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BUG();
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}
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static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
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unsigned long eidx, int flags)
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{
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unsigned long idx;
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int exclusive = flags & BOOTMEM_EXCLUSIVE;
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bdebug("nid=%td start=%lx end=%lx flags=%x\n",
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bdata - bootmem_node_data,
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sidx + bdata->node_min_pfn,
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eidx + bdata->node_min_pfn,
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flags);
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for (idx = sidx; idx < eidx; idx++)
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if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
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if (exclusive) {
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__free(bdata, sidx, idx);
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return -EBUSY;
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}
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bdebug("silent double reserve of PFN %lx\n",
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idx + bdata->node_min_pfn);
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}
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return 0;
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}
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static int __init mark_bootmem_node(bootmem_data_t *bdata,
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unsigned long start, unsigned long end,
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int reserve, int flags)
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{
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unsigned long sidx, eidx;
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bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
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bdata - bootmem_node_data, start, end, reserve, flags);
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BUG_ON(start < bdata->node_min_pfn);
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BUG_ON(end > bdata->node_low_pfn);
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sidx = start - bdata->node_min_pfn;
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eidx = end - bdata->node_min_pfn;
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if (reserve)
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return __reserve(bdata, sidx, eidx, flags);
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else
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__free(bdata, sidx, eidx);
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return 0;
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}
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static int __init mark_bootmem(unsigned long start, unsigned long end,
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int reserve, int flags)
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{
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unsigned long pos;
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bootmem_data_t *bdata;
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pos = start;
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list_for_each_entry(bdata, &bdata_list, list) {
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int err;
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unsigned long max;
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if (pos < bdata->node_min_pfn ||
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pos >= bdata->node_low_pfn) {
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BUG_ON(pos != start);
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continue;
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}
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max = min(bdata->node_low_pfn, end);
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err = mark_bootmem_node(bdata, pos, max, reserve, flags);
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if (reserve && err) {
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mark_bootmem(start, pos, 0, 0);
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return err;
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}
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if (max == end)
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return 0;
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pos = bdata->node_low_pfn;
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}
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BUG();
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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 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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unsigned long start, end;
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start = PFN_UP(physaddr);
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end = PFN_DOWN(physaddr + size);
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mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
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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 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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unsigned long start, end;
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start = PFN_UP(addr);
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end = PFN_DOWN(addr + size);
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mark_bootmem(start, end, 0, 0);
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}
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/**
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* reserve_bootmem_node - mark a page range as reserved
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* @pgdat: node the range resides on
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* @physaddr: starting address of the range
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* @size: size of the range in bytes
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* @flags: reservation flags (see linux/bootmem.h)
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*
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* Partial pages will be reserved.
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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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int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
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unsigned long size, int flags)
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{
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unsigned long start, end;
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start = PFN_DOWN(physaddr);
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end = PFN_UP(physaddr + size);
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return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
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}
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#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
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/**
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* reserve_bootmem - mark a page range as usable
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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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* @flags: reservation flags (see linux/bootmem.h)
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*
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* Partial pages will be reserved.
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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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int __init reserve_bootmem(unsigned long addr, unsigned long size,
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int flags)
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{
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unsigned long start, end;
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start = PFN_DOWN(addr);
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end = PFN_UP(addr + size);
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return mark_bootmem(start, end, 1, flags);
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}
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#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
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static unsigned long align_idx(struct bootmem_data *bdata, unsigned long idx,
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unsigned long step)
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{
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unsigned long base = bdata->node_min_pfn;
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/*
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* Align the index with respect to the node start so that the
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* combination of both satisfies the requested alignment.
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*/
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return ALIGN(base + idx, step) - base;
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}
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static unsigned long align_off(struct bootmem_data *bdata, unsigned long off,
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unsigned long align)
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{
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unsigned long base = PFN_PHYS(bdata->node_min_pfn);
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/* Same as align_idx for byte offsets */
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return ALIGN(base + off, align) - base;
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}
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static void * __init alloc_bootmem_core(struct bootmem_data *bdata,
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unsigned long size, unsigned long align,
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unsigned long goal, unsigned long limit)
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{
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unsigned long fallback = 0;
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unsigned long min, max, start, sidx, midx, step;
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bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
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bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
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align, goal, limit);
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BUG_ON(!size);
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BUG_ON(align & (align - 1));
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BUG_ON(limit && goal + size > limit);
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if (!bdata->node_bootmem_map)
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return NULL;
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min = bdata->node_min_pfn;
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max = bdata->node_low_pfn;
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goal >>= PAGE_SHIFT;
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limit >>= PAGE_SHIFT;
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if (limit && max > limit)
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max = limit;
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if (max <= min)
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return NULL;
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step = max(align >> PAGE_SHIFT, 1UL);
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if (goal && min < goal && goal < max)
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start = ALIGN(goal, step);
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else
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start = ALIGN(min, step);
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sidx = start - bdata->node_min_pfn;
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midx = max - bdata->node_min_pfn;
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if (bdata->hint_idx > sidx) {
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/*
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* Handle the valid case of sidx being zero and still
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* catch the fallback below.
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*/
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fallback = sidx + 1;
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sidx = align_idx(bdata, bdata->hint_idx, step);
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}
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while (1) {
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int merge;
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void *region;
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unsigned long eidx, i, start_off, end_off;
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find_block:
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sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
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sidx = align_idx(bdata, sidx, step);
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eidx = sidx + PFN_UP(size);
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if (sidx >= midx || eidx > midx)
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break;
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for (i = sidx; i < eidx; i++)
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if (test_bit(i, bdata->node_bootmem_map)) {
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sidx = align_idx(bdata, i, step);
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if (sidx == i)
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sidx += step;
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goto find_block;
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}
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if (bdata->last_end_off & (PAGE_SIZE - 1) &&
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PFN_DOWN(bdata->last_end_off) + 1 == sidx)
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start_off = align_off(bdata, bdata->last_end_off, align);
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else
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start_off = PFN_PHYS(sidx);
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merge = PFN_DOWN(start_off) < sidx;
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end_off = start_off + size;
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bdata->last_end_off = end_off;
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bdata->hint_idx = PFN_UP(end_off);
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/*
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* Reserve the area now:
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*/
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if (__reserve(bdata, PFN_DOWN(start_off) + merge,
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PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
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BUG();
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region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
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start_off);
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memset(region, 0, size);
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return region;
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}
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if (fallback) {
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sidx = align_idx(bdata, fallback - 1, step);
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fallback = 0;
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goto find_block;
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}
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return NULL;
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}
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|
static void * __init ___alloc_bootmem_nopanic(unsigned long size,
|
|
unsigned long align,
|
|
unsigned long goal,
|
|
unsigned long limit)
|
|
{
|
|
bootmem_data_t *bdata;
|
|
|
|
restart:
|
|
list_for_each_entry(bdata, &bdata_list, list) {
|
|
void *region;
|
|
|
|
if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
|
|
continue;
|
|
if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
|
|
break;
|
|
|
|
region = alloc_bootmem_core(bdata, size, align, goal, limit);
|
|
if (region)
|
|
return region;
|
|
}
|
|
|
|
if (goal) {
|
|
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)
|
|
{
|
|
return ___alloc_bootmem_nopanic(size, align, goal, 0);
|
|
}
|
|
|
|
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!\n", 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)
|
|
{
|
|
return ___alloc_bootmem(size, align, goal, 0);
|
|
}
|
|
|
|
static void * __init ___alloc_bootmem_node(bootmem_data_t *bdata,
|
|
unsigned long size, unsigned long align,
|
|
unsigned long goal, unsigned long limit)
|
|
{
|
|
void *ptr;
|
|
|
|
ptr = alloc_bootmem_core(bdata, size, align, goal, limit);
|
|
if (ptr)
|
|
return ptr;
|
|
|
|
return ___alloc_bootmem(size, align, goal, limit);
|
|
}
|
|
|
|
/**
|
|
* __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)
|
|
{
|
|
return ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0);
|
|
}
|
|
|
|
#ifdef CONFIG_SPARSEMEM
|
|
/**
|
|
* alloc_bootmem_section - allocate boot memory from a specific section
|
|
* @size: size of the request in bytes
|
|
* @section_nr: sparse map section to allocate from
|
|
*
|
|
* Return NULL on failure.
|
|
*/
|
|
void * __init alloc_bootmem_section(unsigned long size,
|
|
unsigned long section_nr)
|
|
{
|
|
bootmem_data_t *bdata;
|
|
unsigned long pfn, goal, limit;
|
|
|
|
pfn = section_nr_to_pfn(section_nr);
|
|
goal = pfn << PAGE_SHIFT;
|
|
limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
|
|
bdata = &bootmem_node_data[early_pfn_to_nid(pfn)];
|
|
|
|
return alloc_bootmem_core(bdata, size, SMP_CACHE_BYTES, goal, limit);
|
|
}
|
|
#endif
|
|
|
|
void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
|
|
unsigned long align, unsigned long goal)
|
|
{
|
|
void *ptr;
|
|
|
|
ptr = alloc_bootmem_core(pgdat->bdata, size, align, goal, 0);
|
|
if (ptr)
|
|
return ptr;
|
|
|
|
return __alloc_bootmem_nopanic(size, align, goal);
|
|
}
|
|
|
|
#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);
|
|
}
|
|
|
|
/**
|
|
* __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)
|
|
{
|
|
return ___alloc_bootmem_node(pgdat->bdata, size, align,
|
|
goal, ARCH_LOW_ADDRESS_LIMIT);
|
|
}
|