| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/include/asm-i386/topology.h |
| 3 | * |
| 4 | * Written by: Matthew Dobson, IBM Corporation |
| 5 | * |
| 6 | * Copyright (C) 2002, IBM Corp. |
| 7 | * |
| 8 | * All rights reserved. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 18 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 19 | * details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 24 | * |
| 25 | * Send feedback to <colpatch@us.ibm.com> |
| 26 | */ |
| 27 | #ifndef _ASM_I386_TOPOLOGY_H |
| 28 | #define _ASM_I386_TOPOLOGY_H |
| 29 | |
| 30 | #ifdef CONFIG_NUMA |
| 31 | |
| 32 | #include <asm/mpspec.h> |
| 33 | |
| 34 | #include <linux/cpumask.h> |
| 35 | |
| 36 | /* Mappings between logical cpu number and node number */ |
| 37 | extern cpumask_t node_2_cpu_mask[]; |
| 38 | extern int cpu_2_node[]; |
| 39 | |
| 40 | /* Returns the number of the node containing CPU 'cpu' */ |
| 41 | static inline int cpu_to_node(int cpu) |
| 42 | { |
| 43 | return cpu_2_node[cpu]; |
| 44 | } |
| 45 | |
| 46 | /* Returns the number of the node containing Node 'node'. This architecture is flat, |
| 47 | so it is a pretty simple function! */ |
| 48 | #define parent_node(node) (node) |
| 49 | |
| 50 | /* Returns a bitmask of CPUs on Node 'node'. */ |
| 51 | static inline cpumask_t node_to_cpumask(int node) |
| 52 | { |
| 53 | return node_2_cpu_mask[node]; |
| 54 | } |
| 55 | |
| 56 | /* Returns the number of the first CPU on Node 'node'. */ |
| 57 | static inline int node_to_first_cpu(int node) |
| 58 | { |
| 59 | cpumask_t mask = node_to_cpumask(node); |
| 60 | return first_cpu(mask); |
| 61 | } |
| 62 | |
| 63 | /* Returns the number of the node containing PCI bus number 'busnr' */ |
| 64 | static inline cpumask_t __pcibus_to_cpumask(int busnr) |
| 65 | { |
| 66 | return node_to_cpumask(mp_bus_id_to_node[busnr]); |
| 67 | } |
| 68 | #define pcibus_to_cpumask(bus) __pcibus_to_cpumask(bus->number) |
| 69 | |
| 70 | /* sched_domains SD_NODE_INIT for NUMAQ machines */ |
| 71 | #define SD_NODE_INIT (struct sched_domain) { \ |
| 72 | .span = CPU_MASK_NONE, \ |
| 73 | .parent = NULL, \ |
| 74 | .groups = NULL, \ |
| 75 | .min_interval = 8, \ |
| 76 | .max_interval = 32, \ |
| 77 | .busy_factor = 32, \ |
| 78 | .imbalance_pct = 125, \ |
| 79 | .cache_hot_time = (10*1000000), \ |
| 80 | .cache_nice_tries = 1, \ |
| 81 | .per_cpu_gain = 100, \ |
| 82 | .flags = SD_LOAD_BALANCE \ |
| 83 | | SD_BALANCE_EXEC \ |
| 84 | | SD_BALANCE_NEWIDLE \ |
| 85 | | SD_WAKE_IDLE \ |
| 86 | | SD_WAKE_BALANCE, \ |
| 87 | .last_balance = jiffies, \ |
| 88 | .balance_interval = 1, \ |
| 89 | .nr_balance_failed = 0, \ |
| 90 | } |
| 91 | |
| 92 | extern unsigned long node_start_pfn[]; |
| 93 | extern unsigned long node_end_pfn[]; |
| 94 | extern unsigned long node_remap_size[]; |
| 95 | |
| 96 | #define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid]) |
| 97 | |
| 98 | #else /* !CONFIG_NUMA */ |
| 99 | /* |
| 100 | * Other i386 platforms should define their own version of the |
| 101 | * above macros here. |
| 102 | */ |
| 103 | |
| 104 | #include <asm-generic/topology.h> |
| 105 | |
| 106 | #endif /* CONFIG_NUMA */ |
| 107 | |
| 108 | #endif /* _ASM_I386_TOPOLOGY_H */ |