release/src-rt-6.x.4708/linux/linux-2.6.36/arch/tile/include/asm/topology.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_TOPOLOGY_H
  16 #define _ASM_TILE_TOPOLOGY_H
  17
  18 #ifdef CONFIG_NUMA
  19
  20 #include <linux/cpumask.h>
  21
  22 /* Mappings between logical cpu number and node number. */
  23 extern struct cpumask node_2_cpu_mask[];
  24 extern char cpu_2_node[];
  25
  26 /* Returns the number of the node containing CPU 'cpu'. */
  27 static inline int cpu_to_node(int cpu)
  28 {
  29         return cpu_2_node[cpu];
  30 }
  31
  32 /*
  33  * Returns the number of the node containing Node 'node'.
  34  * This architecture is flat, so it is a pretty simple function!
  35  */
  36 #define parent_node(node) (node)
  37
  38 /* Returns a bitmask of CPUs on Node 'node'. */
  39 static inline const struct cpumask *cpumask_of_node(int node)
  40 {
  41         return &node_2_cpu_mask[node];
  42 }
  43
  44 /* For now, use numa node -1 for global allocation. */
  45 #define pcibus_to_node(bus)             ((void)(bus), -1)
  46
  47 /* sched_domains SD_NODE_INIT for TILE architecture */
  48 #define SD_NODE_INIT (struct sched_domain) {            \
  49         .min_interval           = 8,                    \
  50         .max_interval           = 32,                   \
  51         .busy_factor            = 32,                   \
  52         .imbalance_pct          = 125,                  \
  53         .cache_nice_tries       = 1,                    \
  54         .busy_idx               = 3,                    \
  55         .idle_idx               = 1,                    \
  56         .newidle_idx            = 2,                    \
  57         .wake_idx               = 1,                    \
  58         .flags                  = SD_LOAD_BALANCE       \
  59                                 | SD_BALANCE_NEWIDLE    \
  60                                 | SD_BALANCE_EXEC       \
  61                                 | SD_BALANCE_FORK       \
  62                                 | SD_WAKE_AFFINE        \
  63                                 | SD_SERIALIZE,         \
  64         .last_balance           = jiffies,              \
  65         .balance_interval       = 1,                    \
  66 }
  67
  68 /* By definition, we create nodes based on online memory. */
  69 #define node_has_online_mem(nid) 1
  70
  71 #endif /* CONFIG_NUMA */
  72
  73 #include <asm-generic/topology.h>
  74
  75 #ifdef CONFIG_SMP
  76 #define topology_physical_package_id(cpu)       ((void)(cpu), 0)
  77 #define topology_core_id(cpu)                   (cpu)
  78 #define topology_core_cpumask(cpu)              ((void)(cpu), cpu_online_mask)
  79 #define topology_thread_cpumask(cpu)            cpumask_of(cpu)
  80
  81 /* indicates that pointers to the topology struct cpumask maps are valid */
  82 #define arch_provides_topology_pointers         yes
  83 #endif
  84
  85 #endif /* _ASM_TILE_TOPOLOGY_H */