454 lines
14 KiB
C
454 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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/*
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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: %lx, end_pfn: %lx\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 "%lx ", 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 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(KERN_DEBUG "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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char buf[16];
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if (node_has_online_mem(nid) && node_remap_start_vaddr[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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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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memset(buf, 0, sizeof(buf));
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sprintf(buf, "NODE_DATA %d", nid);
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reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t), buf);
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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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/*
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* In the DISCONTIGMEM and SPARSEMEM memory model, a portion of the kernel
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* virtual address space (KVA) is reserved and portions of nodes are mapped
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* using it. This is to allow node-local memory to be allocated for
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* structures that would normally require ZONE_NORMAL. The memory is
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* allocated with alloc_remap() and callers should be prepared to allocate
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* from the bootmem allocator instead.
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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 NULL;
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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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static 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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#ifdef CONFIG_HIBERNATION
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/**
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* resume_map_numa_kva - add KVA mapping to the temporary page tables created
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* during resume from hibernation
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* @pgd_base - temporary resume page directory
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*/
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void resume_map_numa_kva(pgd_t *pgd_base)
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{
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int node;
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for_each_online_node(node) {
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unsigned long start_va, start_pfn, size, pfn;
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start_va = (unsigned long)node_remap_start_vaddr[node];
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start_pfn = node_remap_start_pfn[node];
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size = node_remap_size[node];
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printk(KERN_DEBUG "%s: node %d\n", __func__, node);
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for (pfn = 0; pfn < size; pfn += PTRS_PER_PTE) {
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unsigned long vaddr = start_va + (pfn << PAGE_SHIFT);
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pgd_t *pgd = pgd_base + pgd_index(vaddr);
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pud_t *pud = pud_offset(pgd, vaddr);
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pmd_t *pmd = pmd_offset(pud, vaddr);
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set_pmd(pmd, pfn_pmd(start_pfn + pfn,
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PAGE_KERNEL_LARGE_EXEC));
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printk(KERN_DEBUG "%s: %08lx -> pfn %08lx\n",
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__func__, vaddr, start_pfn + pfn);
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}
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}
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}
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#endif
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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_kva_target;
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u64 node_kva_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(KERN_DEBUG "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_kva_target = round_down(node_end_pfn[nid] - size,
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PTRS_PER_PTE);
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node_kva_target <<= PAGE_SHIFT;
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do {
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node_kva_final = find_e820_area(node_kva_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_kva_target -= LARGE_PAGE_BYTES;
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} while (node_kva_final == -1ULL &&
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(node_kva_target>>PAGE_SHIFT) > (node_start_pfn[nid]));
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if (node_kva_final == -1ULL)
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panic("Can not get kva ram\n");
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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(KERN_DEBUG "Reserving %ld pages of KVA for lmem_map of"
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" node %d at %llx\n",
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size, nid, node_kva_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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* we are supposed to only record the one less then max_low_pfn
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* but we could have some hole in high memory, and it will only
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* check page_is_ram(pfn) && !page_is_reserved_early(pfn) to decide
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* to use it as free.
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* So reserve_early here, hope we don't run out of that array
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*/
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reserve_early(node_kva_final,
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node_kva_final+(((u64)size)<<PAGE_SHIFT),
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"KVA RAM");
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node_remap_start_pfn[nid] = node_kva_final>>PAGE_SHIFT;
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remove_active_range(nid, node_remap_start_pfn[nid],
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node_remap_start_pfn[nid] + size);
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}
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printk(KERN_INFO "Reserving total of %lx 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(KERN_DEBUG "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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void __init initmem_init(unsigned long start_pfn,
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unsigned long end_pfn)
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{
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int nid;
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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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get_memcfg_numa();
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kva_pages = roundup(calculate_numa_remap_pages(), PTRS_PER_PTE);
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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(KERN_INFO "kva_start_pfn ~ %lx max_low_pfn ~ %lx\n",
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kva_start_pfn, max_low_pfn);
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printk(KERN_INFO "max_pfn = %lx\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 > max_low_pfn)
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highstart_pfn = 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 = max_low_pfn;
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high_memory = (void *) __va(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(max_low_pfn));
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printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n",
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max_low_pfn, highstart_pfn);
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printk(KERN_DEBUG "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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remap_numa_kva();
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printk(KERN_DEBUG "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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for_each_online_node(nid)
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memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
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NODE_DATA(0)->bdata = &bootmem_node_data[0];
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setup_bootmem_allocator();
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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);
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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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