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bac4894dfa
On 32-bit NUMA, the memmap representing struct pages on each node is allocated from node-local memory if possible. As only node-0 has memory from ZONE_NORMAL, the memmap must be mapped into low memory. This is done by reserving space in the Kernel Virtual Area (KVA) for the memmap belonging to other nodes by taking pages from the end of ZONE_NORMAL and remapping the other nodes memmap into those virtual addresses. The node boundaries are then adjusted so that the region of pages is not used and it is marked as reserved in the bootmem allocator. This reserved portion of the KVA is PMD aligned althought strictly speaking that requirement could be lifted (see thread at http://lkml.org/lkml/2007/8/24/220). The problem is that when aligned, there may be a portion of ZONE_NORMAL at the end that is not used for memmap and does not have an initialised memmap nor is it marked reserved in the bootmem allocator. Later in the boot process, these pages are freed and a storm of Bad page state messages result. This patch marks these pages reserved that are wasted due to alignment in the bootmem allocator so they are not accidently freed. It is worth noting that memory from node-0 is wasted where it could have been put into ZONE_HIGHMEM on NUMA machines. Worse, the KVA is always reserved from the location of real memory even when there is plenty of spare virtual address space. This patch also makes sure that reserve_bootmem() is not called with a 0-length size in numa_kva_reserve(). When this happens, it usually means that a kernel built for Summit is being booted on a normal machine. The resulting BUG_ON() is misleading so it is caught here. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
442 lines
13 KiB
C
442 lines
13 KiB
C
/*
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* Written by: Patricia Gaughen <gone@us.ibm.com>, IBM Corporation
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* August 2002: added remote node KVA remap - Martin J. Bligh
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*
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* Copyright (C) 2002, IBM Corp.
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*
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* All rights reserved.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/mmzone.h>
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#include <linux/highmem.h>
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#include <linux/initrd.h>
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#include <linux/nodemask.h>
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#include <linux/module.h>
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#include <linux/kexec.h>
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#include <linux/pfn.h>
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#include <linux/swap.h>
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#include <asm/e820.h>
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#include <asm/setup.h>
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#include <asm/mmzone.h>
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#include <bios_ebda.h>
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struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
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EXPORT_SYMBOL(node_data);
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static bootmem_data_t node0_bdata;
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/*
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* numa interface - we expect the numa architecture specific code to have
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* populated the following initialisation.
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*
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* 1) node_online_map - the map of all nodes configured (online) in the system
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* 2) node_start_pfn - the starting page frame number for a node
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* 3) node_end_pfn - the ending page fram number for a node
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*/
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unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly;
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unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly;
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#ifdef CONFIG_DISCONTIGMEM
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/*
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* 4) physnode_map - the mapping between a pfn and owning node
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* physnode_map keeps track of the physical memory layout of a generic
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* numa node on a 256Mb break (each element of the array will
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* represent 256Mb of memory and will be marked by the node id. so,
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* if the first gig is on node 0, and the second gig is on node 1
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* physnode_map will contain:
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*
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* physnode_map[0-3] = 0;
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* physnode_map[4-7] = 1;
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* physnode_map[8- ] = -1;
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*/
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s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
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EXPORT_SYMBOL(physnode_map);
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void memory_present(int nid, unsigned long start, unsigned long end)
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{
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unsigned long pfn;
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printk(KERN_INFO "Node: %d, start_pfn: %ld, end_pfn: %ld\n",
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nid, start, end);
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printk(KERN_DEBUG " Setting physnode_map array to node %d for pfns:\n", nid);
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printk(KERN_DEBUG " ");
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for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) {
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physnode_map[pfn / PAGES_PER_ELEMENT] = nid;
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printk("%ld ", pfn);
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}
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printk("\n");
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}
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unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
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unsigned long end_pfn)
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{
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unsigned long nr_pages = end_pfn - start_pfn;
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if (!nr_pages)
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return 0;
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return (nr_pages + 1) * sizeof(struct page);
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}
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#endif
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extern unsigned long find_max_low_pfn(void);
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extern void add_one_highpage_init(struct page *, int, int);
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extern unsigned long highend_pfn, highstart_pfn;
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#define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
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static unsigned long node_remap_start_pfn[MAX_NUMNODES];
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unsigned long node_remap_size[MAX_NUMNODES];
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static unsigned long node_remap_offset[MAX_NUMNODES];
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static void *node_remap_start_vaddr[MAX_NUMNODES];
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void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
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static void *node_remap_end_vaddr[MAX_NUMNODES];
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static void *node_remap_alloc_vaddr[MAX_NUMNODES];
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static unsigned long kva_start_pfn;
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static unsigned long kva_pages;
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/*
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* FLAT - support for basic PC memory model with discontig enabled, essentially
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* a single node with all available processors in it with a flat
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* memory map.
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*/
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int __init get_memcfg_numa_flat(void)
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{
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printk("NUMA - single node, flat memory mode\n");
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/* Run the memory configuration and find the top of memory. */
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find_max_pfn();
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node_start_pfn[0] = 0;
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node_end_pfn[0] = max_pfn;
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memory_present(0, 0, max_pfn);
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/* Indicate there is one node available. */
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nodes_clear(node_online_map);
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node_set_online(0);
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return 1;
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}
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/*
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* Find the highest page frame number we have available for the node
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*/
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static void __init find_max_pfn_node(int nid)
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{
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if (node_end_pfn[nid] > max_pfn)
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node_end_pfn[nid] = max_pfn;
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/*
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* if a user has given mem=XXXX, then we need to make sure
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* that the node _starts_ before that, too, not just ends
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*/
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if (node_start_pfn[nid] > max_pfn)
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node_start_pfn[nid] = max_pfn;
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BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]);
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}
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/*
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* Allocate memory for the pg_data_t for this node via a crude pre-bootmem
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* method. For node zero take this from the bottom of memory, for
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* subsequent nodes place them at node_remap_start_vaddr which contains
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* node local data in physically node local memory. See setup_memory()
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* for details.
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*/
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static void __init allocate_pgdat(int nid)
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{
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if (nid && node_has_online_mem(nid))
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NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
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else {
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NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(min_low_pfn));
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min_low_pfn += PFN_UP(sizeof(pg_data_t));
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}
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}
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void *alloc_remap(int nid, unsigned long size)
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{
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void *allocation = node_remap_alloc_vaddr[nid];
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size = ALIGN(size, L1_CACHE_BYTES);
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if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid])
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return 0;
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node_remap_alloc_vaddr[nid] += size;
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memset(allocation, 0, size);
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return allocation;
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}
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void __init remap_numa_kva(void)
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{
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void *vaddr;
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unsigned long pfn;
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int node;
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for_each_online_node(node) {
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for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) {
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vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT);
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set_pmd_pfn((ulong) vaddr,
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node_remap_start_pfn[node] + pfn,
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PAGE_KERNEL_LARGE);
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}
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}
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}
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static unsigned long calculate_numa_remap_pages(void)
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{
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int nid;
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unsigned long size, reserve_pages = 0;
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unsigned long pfn;
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for_each_online_node(nid) {
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unsigned old_end_pfn = node_end_pfn[nid];
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/*
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* The acpi/srat node info can show hot-add memroy zones
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* where memory could be added but not currently present.
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*/
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if (node_start_pfn[nid] > max_pfn)
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continue;
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if (node_end_pfn[nid] > max_pfn)
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node_end_pfn[nid] = max_pfn;
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/* ensure the remap includes space for the pgdat. */
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size = node_remap_size[nid] + sizeof(pg_data_t);
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/* convert size to large (pmd size) pages, rounding up */
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size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES;
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/* now the roundup is correct, convert to PAGE_SIZE pages */
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size = size * PTRS_PER_PTE;
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/*
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* Validate the region we are allocating only contains valid
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* pages.
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*/
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for (pfn = node_end_pfn[nid] - size;
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pfn < node_end_pfn[nid]; pfn++)
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if (!page_is_ram(pfn))
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break;
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if (pfn != node_end_pfn[nid])
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size = 0;
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printk("Reserving %ld pages of KVA for lmem_map of node %d\n",
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size, nid);
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node_remap_size[nid] = size;
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node_remap_offset[nid] = reserve_pages;
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reserve_pages += size;
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printk("Shrinking node %d from %ld pages to %ld pages\n",
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nid, node_end_pfn[nid], node_end_pfn[nid] - size);
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if (node_end_pfn[nid] & (PTRS_PER_PTE-1)) {
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/*
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* Align node_end_pfn[] and node_remap_start_pfn[] to
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* pmd boundary. remap_numa_kva will barf otherwise.
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*/
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printk("Shrinking node %d further by %ld pages for proper alignment\n",
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nid, node_end_pfn[nid] & (PTRS_PER_PTE-1));
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size += node_end_pfn[nid] & (PTRS_PER_PTE-1);
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}
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node_end_pfn[nid] -= size;
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node_remap_start_pfn[nid] = node_end_pfn[nid];
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shrink_active_range(nid, old_end_pfn, node_end_pfn[nid]);
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}
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printk("Reserving total of %ld pages for numa KVA remap\n",
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reserve_pages);
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return reserve_pages;
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}
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extern void setup_bootmem_allocator(void);
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unsigned long __init setup_memory(void)
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{
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int nid;
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unsigned long system_start_pfn, system_max_low_pfn;
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unsigned long wasted_pages;
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/*
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* When mapping a NUMA machine we allocate the node_mem_map arrays
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* from node local memory. They are then mapped directly into KVA
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* between zone normal and vmalloc space. Calculate the size of
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* this space and use it to adjust the boundary between ZONE_NORMAL
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* and ZONE_HIGHMEM.
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*/
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find_max_pfn();
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get_memcfg_numa();
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kva_pages = calculate_numa_remap_pages();
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/* partially used pages are not usable - thus round upwards */
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system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end);
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kva_start_pfn = find_max_low_pfn() - kva_pages;
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#ifdef CONFIG_BLK_DEV_INITRD
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/* Numa kva area is below the initrd */
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if (initrd_start)
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kva_start_pfn = PFN_DOWN(initrd_start - PAGE_OFFSET)
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- kva_pages;
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#endif
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/*
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* We waste pages past at the end of the KVA for no good reason other
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* than how it is located. This is bad.
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*/
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wasted_pages = kva_start_pfn & (PTRS_PER_PTE-1);
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kva_start_pfn -= wasted_pages;
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kva_pages += wasted_pages;
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system_max_low_pfn = max_low_pfn = find_max_low_pfn();
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printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n",
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kva_start_pfn, max_low_pfn);
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printk("max_pfn = %ld\n", max_pfn);
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#ifdef CONFIG_HIGHMEM
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highstart_pfn = highend_pfn = max_pfn;
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if (max_pfn > system_max_low_pfn)
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highstart_pfn = system_max_low_pfn;
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printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
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pages_to_mb(highend_pfn - highstart_pfn));
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num_physpages = highend_pfn;
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high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
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#else
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num_physpages = system_max_low_pfn;
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high_memory = (void *) __va(system_max_low_pfn * PAGE_SIZE - 1) + 1;
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#endif
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printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
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pages_to_mb(system_max_low_pfn));
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printk("min_low_pfn = %ld, max_low_pfn = %ld, highstart_pfn = %ld\n",
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min_low_pfn, max_low_pfn, highstart_pfn);
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printk("Low memory ends at vaddr %08lx\n",
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(ulong) pfn_to_kaddr(max_low_pfn));
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for_each_online_node(nid) {
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node_remap_start_vaddr[nid] = pfn_to_kaddr(
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kva_start_pfn + node_remap_offset[nid]);
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/* Init the node remap allocator */
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node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] +
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(node_remap_size[nid] * PAGE_SIZE);
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node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] +
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ALIGN(sizeof(pg_data_t), PAGE_SIZE);
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allocate_pgdat(nid);
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printk ("node %d will remap to vaddr %08lx - %08lx\n", nid,
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(ulong) node_remap_start_vaddr[nid],
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(ulong) pfn_to_kaddr(highstart_pfn
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+ node_remap_offset[nid] + node_remap_size[nid]));
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}
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printk("High memory starts at vaddr %08lx\n",
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(ulong) pfn_to_kaddr(highstart_pfn));
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for_each_online_node(nid)
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find_max_pfn_node(nid);
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memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
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NODE_DATA(0)->bdata = &node0_bdata;
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setup_bootmem_allocator();
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return max_low_pfn;
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}
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void __init numa_kva_reserve(void)
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{
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if (kva_pages)
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reserve_bootmem(PFN_PHYS(kva_start_pfn), PFN_PHYS(kva_pages));
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}
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void __init zone_sizes_init(void)
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{
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int nid;
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unsigned long max_zone_pfns[MAX_NR_ZONES];
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memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
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max_zone_pfns[ZONE_DMA] =
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virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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#ifdef CONFIG_HIGHMEM
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max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
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#endif
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/* If SRAT has not registered memory, register it now */
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if (find_max_pfn_with_active_regions() == 0) {
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for_each_online_node(nid) {
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if (node_has_online_mem(nid))
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add_active_range(nid, node_start_pfn[nid],
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node_end_pfn[nid]);
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}
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}
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free_area_init_nodes(max_zone_pfns);
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return;
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}
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void __init set_highmem_pages_init(int bad_ppro)
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{
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#ifdef CONFIG_HIGHMEM
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struct zone *zone;
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struct page *page;
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for_each_zone(zone) {
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unsigned long node_pfn, zone_start_pfn, zone_end_pfn;
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if (!is_highmem(zone))
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continue;
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zone_start_pfn = zone->zone_start_pfn;
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zone_end_pfn = zone_start_pfn + zone->spanned_pages;
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printk("Initializing %s for node %d (%08lx:%08lx)\n",
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zone->name, zone_to_nid(zone),
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zone_start_pfn, zone_end_pfn);
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for (node_pfn = zone_start_pfn; node_pfn < zone_end_pfn; node_pfn++) {
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if (!pfn_valid(node_pfn))
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continue;
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page = pfn_to_page(node_pfn);
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add_one_highpage_init(page, node_pfn, bad_ppro);
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}
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}
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totalram_pages += totalhigh_pages;
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#endif
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}
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#ifdef CONFIG_MEMORY_HOTPLUG
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static int paddr_to_nid(u64 addr)
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{
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int nid;
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unsigned long pfn = PFN_DOWN(addr);
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for_each_node(nid)
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if (node_start_pfn[nid] <= pfn &&
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pfn < node_end_pfn[nid])
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return nid;
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return -1;
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}
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/*
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* This function is used to ask node id BEFORE memmap and mem_section's
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* initialization (pfn_to_nid() can't be used yet).
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* If _PXM is not defined on ACPI's DSDT, node id must be found by this.
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|
*/
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int memory_add_physaddr_to_nid(u64 addr)
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|
{
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|
int nid = paddr_to_nid(addr);
|
|
return (nid >= 0) ? nid : 0;
|
|
}
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|
|
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EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
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#endif
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