9043f00796
don't assume we can use RAM near the end of every node. Esp systems that have few memory and they could have kva address and kva RAM all below max_low_pfn. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
485 lines
14 KiB
C
485 lines
14 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 <linux/acpi.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 <asm/bios_ebda.h>
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#include <asm/proto.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 64Mb break (each element of the array will
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* represent 64Mb 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[0-15] = 0;
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* physnode_map[16-31] = 1;
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* physnode_map[32- ] = -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(KERN_CONT "%ld ", pfn);
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}
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printk(KERN_CONT "\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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unsigned long node_remap_size[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 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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node_start_pfn[0] = 0;
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node_end_pfn[0] = max_pfn;
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e820_register_active_regions(0, 0, max_pfn);
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memory_present(0, 0, max_pfn);
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node_remap_size[0] = node_memmap_size_bytes(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 propagate_e820_map_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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unsigned long pgdat_phys;
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pgdat_phys = find_e820_area(min_low_pfn<<PAGE_SHIFT,
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(nid ? max_low_pfn:max_pfn_mapped)<<PAGE_SHIFT,
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sizeof(pg_data_t),
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PAGE_SIZE);
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NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT));
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reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t),
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"NODE_DATA");
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}
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printk(KERN_DEBUG "allocate_pgdat: node %d NODE_DATA %08lx\n",
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nid, (unsigned long)NODE_DATA(nid));
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}
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#ifdef CONFIG_DISCONTIGMEM
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/*
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* In the discontig memory model, a portion of the kernel virtual area (KVA)
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* is reserved and portions of nodes are mapped using it. This is to allow
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* node-local memory to be allocated for structures that would normally require
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* ZONE_NORMAL. The memory is allocated with alloc_remap() and callers
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* should be prepared to allocate from the bootmem allocator instead. This KVA
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* mechanism is incompatible with SPARSEMEM as it makes assumptions about the
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* layout of memory that are broken if alloc_remap() succeeds for some of the
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* map and fails for others
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*/
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static unsigned long node_remap_start_pfn[MAX_NUMNODES];
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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 node_remap_offset[MAX_NUMNODES];
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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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printk(KERN_DEBUG "remap_numa_kva: node %d\n", 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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printk(KERN_DEBUG "remap_numa_kva: %08lx to pfn %08lx\n",
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(unsigned long)vaddr,
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node_remap_start_pfn[node] + pfn);
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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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for_each_online_node(nid) {
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u64 node_end_target;
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u64 node_end_final;
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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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printk("node %d pfn: [%lx - %lx]\n",
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nid, node_start_pfn[nid], node_end_pfn[nid]);
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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])
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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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node_end_target = round_down(node_end_pfn[nid] - size,
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PTRS_PER_PTE);
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node_end_target <<= PAGE_SHIFT;
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do {
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node_end_final = find_e820_area(node_end_target,
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((u64)node_end_pfn[nid])<<PAGE_SHIFT,
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((u64)size)<<PAGE_SHIFT,
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LARGE_PAGE_BYTES);
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node_end_target -= LARGE_PAGE_BYTES;
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} while (node_end_final == -1ULL &&
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(node_end_target>>PAGE_SHIFT) > (node_start_pfn[nid]));
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if (node_end_final == -1ULL)
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panic("Can not get kva ram\n");
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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 %lld pages\n",
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nid, node_end_pfn[nid], node_end_final>>PAGE_SHIFT);
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/*
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* prevent kva address below max_low_pfn want it on system
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* with less memory later.
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* layout will be: KVA address , KVA RAM
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*/
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if ((node_end_final>>PAGE_SHIFT) < max_low_pfn)
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reserve_early(node_end_final,
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node_end_final+(((u64)size)<<PAGE_SHIFT),
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"KVA RAM");
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node_end_pfn[nid] = node_end_final>>PAGE_SHIFT;
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node_remap_start_pfn[nid] = node_end_pfn[nid];
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shrink_active_range(nid, 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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static void init_remap_allocator(int nid)
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{
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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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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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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) node_remap_end_vaddr[nid]);
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}
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#else
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void *alloc_remap(int nid, unsigned long size)
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{
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return NULL;
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}
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static unsigned long calculate_numa_remap_pages(void)
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{
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return 0;
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}
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static void init_remap_allocator(int nid)
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{
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}
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void __init remap_numa_kva(void)
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{
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}
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#endif /* CONFIG_DISCONTIGMEM */
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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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long kva_target_pfn;
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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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/* call find_max_low_pfn at first, it could update max_pfn */
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system_max_low_pfn = max_low_pfn = find_max_low_pfn();
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remove_all_active_ranges();
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get_memcfg_numa();
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kva_pages = round_up(calculate_numa_remap_pages(), PTRS_PER_PTE);
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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_target_pfn = round_down(max_low_pfn - kva_pages, PTRS_PER_PTE);
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do {
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kva_start_pfn = find_e820_area(kva_target_pfn<<PAGE_SHIFT,
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max_low_pfn<<PAGE_SHIFT,
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kva_pages<<PAGE_SHIFT,
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PTRS_PER_PTE<<PAGE_SHIFT) >> PAGE_SHIFT;
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kva_target_pfn -= PTRS_PER_PTE;
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} while (kva_start_pfn == -1UL && kva_target_pfn > min_low_pfn);
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if (kva_start_pfn == -1UL)
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panic("Can not get kva space\n");
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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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/* avoid clash with initrd */
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reserve_early(kva_start_pfn<<PAGE_SHIFT,
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(kva_start_pfn + kva_pages)<<PAGE_SHIFT,
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"KVA PG");
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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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init_remap_allocator(nid);
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allocate_pgdat(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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propagate_e820_map_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 zone_sizes_init(void)
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{
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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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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++) {
|
|
if (!pfn_valid(node_pfn))
|
|
continue;
|
|
page = pfn_to_page(node_pfn);
|
|
add_one_highpage_init(page, node_pfn, bad_ppro);
|
|
}
|
|
}
|
|
totalram_pages += totalhigh_pages;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
static int paddr_to_nid(u64 addr)
|
|
{
|
|
int nid;
|
|
unsigned long pfn = PFN_DOWN(addr);
|
|
|
|
for_each_node(nid)
|
|
if (node_start_pfn[nid] <= pfn &&
|
|
pfn < node_end_pfn[nid])
|
|
return nid;
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* This function is used to ask node id BEFORE memmap and mem_section's
|
|
* initialization (pfn_to_nid() can't be used yet).
|
|
* If _PXM is not defined on ACPI's DSDT, node id must be found by this.
|
|
*/
|
|
int memory_add_physaddr_to_nid(u64 addr)
|
|
{
|
|
int nid = paddr_to_nid(addr);
|
|
return (nid >= 0) ? nid : 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
|
|
#endif
|