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Diffstat (limited to 'include/asm-i386/topology.h')
| -rw-r--r-- | include/asm-i386/topology.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/include/asm-i386/topology.h b/include/asm-i386/topology.h new file mode 100644 index 000000000000..98f9e6850cba --- /dev/null +++ b/include/asm-i386/topology.h @@ -0,0 +1,108 @@ +/* + * linux/include/asm-i386/topology.h + * + * Written by: Matthew Dobson, IBM Corporation + * + * Copyright (C) 2002, IBM Corp. + * + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Send feedback to <colpatch@us.ibm.com> + */ +#ifndef _ASM_I386_TOPOLOGY_H +#define _ASM_I386_TOPOLOGY_H + +#ifdef CONFIG_NUMA + +#include <asm/mpspec.h> + +#include <linux/cpumask.h> + +/* Mappings between logical cpu number and node number */ +extern cpumask_t node_2_cpu_mask[]; +extern int cpu_2_node[]; + +/* Returns the number of the node containing CPU 'cpu' */ +static inline int cpu_to_node(int cpu) +{ + return cpu_2_node[cpu]; +} + +/* Returns the number of the node containing Node 'node'. This architecture is flat, + so it is a pretty simple function! */ +#define parent_node(node) (node) + +/* Returns a bitmask of CPUs on Node 'node'. */ +static inline cpumask_t node_to_cpumask(int node) +{ + return node_2_cpu_mask[node]; +} + +/* Returns the number of the first CPU on Node 'node'. */ +static inline int node_to_first_cpu(int node) +{ + cpumask_t mask = node_to_cpumask(node); + return first_cpu(mask); +} + +/* Returns the number of the node containing PCI bus number 'busnr' */ +static inline cpumask_t __pcibus_to_cpumask(int busnr) +{ + return node_to_cpumask(mp_bus_id_to_node[busnr]); +} +#define pcibus_to_cpumask(bus) __pcibus_to_cpumask(bus->number) + +/* sched_domains SD_NODE_INIT for NUMAQ machines */ +#define SD_NODE_INIT (struct sched_domain) { \ + .span = CPU_MASK_NONE, \ + .parent = NULL, \ + .groups = NULL, \ + .min_interval = 8, \ + .max_interval = 32, \ + .busy_factor = 32, \ + .imbalance_pct = 125, \ + .cache_hot_time = (10*1000000), \ + .cache_nice_tries = 1, \ + .per_cpu_gain = 100, \ + .flags = SD_LOAD_BALANCE \ + | SD_BALANCE_EXEC \ + | SD_BALANCE_NEWIDLE \ + | SD_WAKE_IDLE \ + | SD_WAKE_BALANCE, \ + .last_balance = jiffies, \ + .balance_interval = 1, \ + .nr_balance_failed = 0, \ +} + +extern unsigned long node_start_pfn[]; +extern unsigned long node_end_pfn[]; +extern unsigned long node_remap_size[]; + +#define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid]) + +#else /* !CONFIG_NUMA */ +/* + * Other i386 platforms should define their own version of the + * above macros here. + */ + +#include <asm-generic/topology.h> + +#endif /* CONFIG_NUMA */ + +#endif /* _ASM_I386_TOPOLOGY_H */ |