11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This file is subject to the terms and conditions of the GNU General Public 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * License. See the file "COPYING" in the main directory of this archive 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * for more details. 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This file contains NUMA specific variables and functions which can 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * be split away from DISCONTIGMEM and are used on NUMA machines with 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * contiguous memory. 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2002/08/07 Erich Focht <efocht@ess.nec.de> 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/cpu.h> 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mm.h> 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/node.h> 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/bootmem.h> 198c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey#include <linux/module.h> 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/mmzone.h> 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/numa.h> 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The following structures are usually initialized by ACPI or 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * similar mechanisms and describe the NUMA characteristics of the machine. 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint num_node_memblks; 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstruct node_memblk_s node_memblk[NR_NODE_MEMBLKS]; 302c6e6db41f01b6b4eb98809350827c9678996698holt@sgi.comstruct node_cpuid_s node_cpuid[NR_CPUS] = 312c6e6db41f01b6b4eb98809350827c9678996698holt@sgi.com { [0 ... NR_CPUS-1] = { .phys_id = 0, .nid = NUMA_NO_NODE } }; 322c6e6db41f01b6b4eb98809350827c9678996698holt@sgi.com 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This is a matrix with "distances" between nodes, they should be 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * proportional to the memory access latency ratios. 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsu8 numa_slit[MAX_NUMNODES * MAX_NUMNODES]; 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Identify which cnode a physical address resides on */ 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldspaddr_to_nid(unsigned long paddr) 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < num_node_memblks; i++) 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (paddr >= node_memblk[i].start_paddr && 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds paddr < node_memblk[i].start_paddr + node_memblk[i].size) 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return (i < num_node_memblks) ? node_memblk[i].nid : (num_node_memblks ? -1 : 0); 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 522d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco 532d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_NUMA) 542d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco/* 552d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco * Because of holes evaluate on section limits. 562d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco * If the section of memory exists, then return the node where the section 572d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco * resides. Otherwise return node 0 as the default. This is used by 582d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco * SPARSEMEM to allocate the SPARSEMEM sectionmap on the NUMA node where 592d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco * the section resides. 602d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco */ 61f2dbcfa738368c8a40d4a5f0b65dc9879577cb21KAMEZAWA Hiroyukiint __meminit __early_pfn_to_nid(unsigned long pfn) 622d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco{ 632d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco int i, section = pfn >> PFN_SECTION_SHIFT, ssec, esec; 642d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco 652d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco for (i = 0; i < num_node_memblks; i++) { 662d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco ssec = node_memblk[i].start_paddr >> PA_SECTION_SHIFT; 672d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco esec = (node_memblk[i].start_paddr + node_memblk[i].size + 682d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco ((1L << PA_SECTION_SHIFT) - 1)) >> PA_SECTION_SHIFT; 692d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco if (section >= ssec && section < esec) 702d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco return node_memblk[i].nid; 712d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco } 722d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco 73cc2559bccc72767cb446f79b071d96c30c26439bKAMEZAWA Hiroyuki return -1; 742d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco} 758c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey 768c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey#ifdef CONFIG_MEMORY_HOTPLUG 778c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey/* 788c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey * SRAT information is stored in node_memblk[], then we can use SRAT 798c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey * information at memory-hot-add if necessary. 808c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey */ 818c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey 828c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Manntheyint memory_add_physaddr_to_nid(u64 addr) 838c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey{ 848c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey int nid = paddr_to_nid(addr); 858c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey if (nid < 0) 868c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey return 0; 878c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey return nid; 888c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey} 898c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey 908c2676a5870ab15cbeea9f826266bc946fe3cc26Keith ManntheyEXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 918c2676a5870ab15cbeea9f826266bc946fe3cc26Keith Mannthey#endif 922d4b1fa234417b902c9d3034442387c1805bfa7bBob Picco#endif 93