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

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  1 #ifndef _ASM_POWERPC_TOPOLOGY_H
  2 #define _ASM_POWERPC_TOPOLOGY_H
  3 #ifdef __KERNEL__
  4 
  5 
  6 struct device;
  7 struct device_node;
  8 
  9 #ifdef CONFIG_NUMA
 10 
 11 /*
 12  * Before going off node we want the VM to try and reclaim from the local
 13  * node. It does this if the remote distance is larger than RECLAIM_DISTANCE.
 14  * With the default REMOTE_DISTANCE of 20 and the default RECLAIM_DISTANCE of
 15  * 20, we never reclaim and go off node straight away.
 16  *
 17  * To fix this we choose a smaller value of RECLAIM_DISTANCE.
 18  */
 19 #define RECLAIM_DISTANCE 10
 20 
 21 #include <asm/mmzone.h>
 22 
 23 static inline int cpu_to_node(int cpu)
 24 {
 25         int nid;
 26 
 27         nid = numa_cpu_lookup_table[cpu];
 28 
 29         /*
 30          * During early boot, the numa-cpu lookup table might not have been
 31          * setup for all CPUs yet. In such cases, default to node 0.
 32          */
 33         return (nid < 0) ? 0 : nid;
 34 }
 35 
 36 #define parent_node(node)       (node)
 37 
 38 #define cpumask_of_node(node) ((node) == -1 ?                           \
 39                                cpu_all_mask :                           \
 40                                node_to_cpumask_map[node])
 41 
 42 struct pci_bus;
 43 #ifdef CONFIG_PCI
 44 extern int pcibus_to_node(struct pci_bus *bus);
 45 #else
 46 static inline int pcibus_to_node(struct pci_bus *bus)
 47 {
 48         return -1;
 49 }
 50 #endif
 51 
 52 #define cpumask_of_pcibus(bus)  (pcibus_to_node(bus) == -1 ?            \
 53                                  cpu_all_mask :                         \
 54                                  cpumask_of_node(pcibus_to_node(bus)))
 55 
 56 extern int __node_distance(int, int);
 57 #define node_distance(a, b) __node_distance(a, b)
 58 
 59 extern void __init dump_numa_cpu_topology(void);
 60 
 61 extern int sysfs_add_device_to_node(struct device *dev, int nid);
 62 extern void sysfs_remove_device_from_node(struct device *dev, int nid);
 63 
 64 #else
 65 
 66 static inline void dump_numa_cpu_topology(void) {}
 67 
 68 static inline int sysfs_add_device_to_node(struct device *dev, int nid)
 69 {
 70         return 0;
 71 }
 72 
 73 static inline void sysfs_remove_device_from_node(struct device *dev,
 74                                                 int nid)
 75 {
 76 }
 77 #endif /* CONFIG_NUMA */
 78 
 79 #if defined(CONFIG_NUMA) && defined(CONFIG_PPC_SPLPAR)
 80 extern int start_topology_update(void);
 81 extern int stop_topology_update(void);
 82 extern int prrn_is_enabled(void);
 83 #else
 84 static inline int start_topology_update(void)
 85 {
 86         return 0;
 87 }
 88 static inline int stop_topology_update(void)
 89 {
 90         return 0;
 91 }
 92 static inline int prrn_is_enabled(void)
 93 {
 94         return 0;
 95 }
 96 #endif /* CONFIG_NUMA && CONFIG_PPC_SPLPAR */
 97 
 98 #include <asm-generic/topology.h>
 99 
100 #ifdef CONFIG_SMP
101 #include <asm/cputable.h>
102 #define smt_capable()           (cpu_has_feature(CPU_FTR_SMT))
103 
104 #ifdef CONFIG_PPC64
105 #include <asm/smp.h>
106 
107 #define topology_thread_cpumask(cpu)    (per_cpu(cpu_sibling_map, cpu))
108 #define topology_core_cpumask(cpu)      (per_cpu(cpu_core_map, cpu))
109 #define topology_core_id(cpu)           (cpu_to_core_id(cpu))
110 #endif
111 #endif
112 
113 #endif /* __KERNEL__ */
114 #endif  /* _ASM_POWERPC_TOPOLOGY_H */
115 

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