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Linux/arch/x86/include/asm/topology.h

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  1 /*
  2  * Written by: Matthew Dobson, IBM Corporation
  3  *
  4  * Copyright (C) 2002, IBM Corp.
  5  *
  6  * All rights reserved.
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful, but
 14  * WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 16  * NON INFRINGEMENT.  See the GNU General Public License for more
 17  * details.
 18  *
 19  * You should have received a copy of the GNU General Public License
 20  * along with this program; if not, write to the Free Software
 21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 22  *
 23  * Send feedback to <colpatch@us.ibm.com>
 24  */
 25 #ifndef _ASM_X86_TOPOLOGY_H
 26 #define _ASM_X86_TOPOLOGY_H
 27 
 28 /*
 29  * to preserve the visibility of NUMA_NO_NODE definition,
 30  * moved to there from here.  May be used independent of
 31  * CONFIG_NUMA.
 32  */
 33 #include <linux/numa.h>
 34 
 35 #ifdef CONFIG_NUMA
 36 #include <linux/cpumask.h>
 37 
 38 #include <asm/mpspec.h>
 39 #include <asm/percpu.h>
 40 
 41 /* Mappings between logical cpu number and node number */
 42 DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
 43 
 44 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
 45 /*
 46  * override generic percpu implementation of cpu_to_node
 47  */
 48 extern int __cpu_to_node(int cpu);
 49 #define cpu_to_node __cpu_to_node
 50 
 51 extern int early_cpu_to_node(int cpu);
 52 
 53 #else   /* !CONFIG_DEBUG_PER_CPU_MAPS */
 54 
 55 /* Same function but used if called before per_cpu areas are setup */
 56 static inline int early_cpu_to_node(int cpu)
 57 {
 58         return early_per_cpu(x86_cpu_to_node_map, cpu);
 59 }
 60 
 61 #endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
 62 
 63 /* Mappings between node number and cpus on that node. */
 64 extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
 65 
 66 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
 67 extern const struct cpumask *cpumask_of_node(int node);
 68 #else
 69 /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
 70 static inline const struct cpumask *cpumask_of_node(int node)
 71 {
 72         return node_to_cpumask_map[node];
 73 }
 74 #endif
 75 
 76 extern void setup_node_to_cpumask_map(void);
 77 
 78 #define pcibus_to_node(bus) __pcibus_to_node(bus)
 79 
 80 extern int __node_distance(int, int);
 81 #define node_distance(a, b) __node_distance(a, b)
 82 
 83 #else /* !CONFIG_NUMA */
 84 
 85 static inline int numa_node_id(void)
 86 {
 87         return 0;
 88 }
 89 /*
 90  * indicate override:
 91  */
 92 #define numa_node_id numa_node_id
 93 
 94 static inline int early_cpu_to_node(int cpu)
 95 {
 96         return 0;
 97 }
 98 
 99 static inline void setup_node_to_cpumask_map(void) { }
100 
101 #endif
102 
103 #include <asm-generic/topology.h>
104 
105 extern const struct cpumask *cpu_coregroup_mask(int cpu);
106 
107 #define topology_logical_package_id(cpu)        (cpu_data(cpu).logical_proc_id)
108 #define topology_physical_package_id(cpu)       (cpu_data(cpu).phys_proc_id)
109 #define topology_core_id(cpu)                   (cpu_data(cpu).cpu_core_id)
110 
111 #ifdef CONFIG_SMP
112 #define topology_core_cpumask(cpu)              (per_cpu(cpu_core_map, cpu))
113 #define topology_sibling_cpumask(cpu)           (per_cpu(cpu_sibling_map, cpu))
114 
115 extern unsigned int __max_logical_packages;
116 #define topology_max_packages()                 (__max_logical_packages)
117 
118 extern int __max_smt_threads;
119 
120 static inline int topology_max_smt_threads(void)
121 {
122         return __max_smt_threads;
123 }
124 
125 int topology_update_package_map(unsigned int apicid, unsigned int cpu);
126 int topology_phys_to_logical_pkg(unsigned int pkg);
127 bool topology_is_primary_thread(unsigned int cpu);
128 bool topology_smt_supported(void);
129 #else
130 #define topology_max_packages()                 (1)
131 static inline int
132 topology_update_package_map(unsigned int apicid, unsigned int cpu) { return 0; }
133 static inline int topology_phys_to_logical_pkg(unsigned int pkg) { return 0; }
134 static inline int topology_max_smt_threads(void) { return 1; }
135 static inline bool topology_is_primary_thread(unsigned int cpu) { return true; }
136 static inline bool topology_smt_supported(void) { return false; }
137 #endif
138 
139 static inline void arch_fix_phys_package_id(int num, u32 slot)
140 {
141 }
142 
143 struct pci_bus;
144 int x86_pci_root_bus_node(int bus);
145 void x86_pci_root_bus_resources(int bus, struct list_head *resources);
146 
147 extern bool x86_topology_update;
148 
149 #ifdef CONFIG_SCHED_MC_PRIO
150 #include <asm/percpu.h>
151 
152 DECLARE_PER_CPU_READ_MOSTLY(int, sched_core_priority);
153 extern unsigned int __read_mostly sysctl_sched_itmt_enabled;
154 
155 /* Interface to set priority of a cpu */
156 void sched_set_itmt_core_prio(int prio, int core_cpu);
157 
158 /* Interface to notify scheduler that system supports ITMT */
159 int sched_set_itmt_support(void);
160 
161 /* Interface to notify scheduler that system revokes ITMT support */
162 void sched_clear_itmt_support(void);
163 
164 #else /* CONFIG_SCHED_MC_PRIO */
165 
166 #define sysctl_sched_itmt_enabled       0
167 static inline void sched_set_itmt_core_prio(int prio, int core_cpu)
168 {
169 }
170 static inline int sched_set_itmt_support(void)
171 {
172         return 0;
173 }
174 static inline void sched_clear_itmt_support(void)
175 {
176 }
177 #endif /* CONFIG_SCHED_MC_PRIO */
178 
179 #endif /* _ASM_X86_TOPOLOGY_H */
180 

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