LXR linux/arch/ia64/include/asm/sn/nodepda.h

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 1992 - 1997, 2000-2005 Silicon Graphics, Inc. All rights reserved.
   7 */
   8#ifndef _ASM_IA64_SN_NODEPDA_H
   9#define _ASM_IA64_SN_NODEPDA_H
  10
  11
  12#include <asm/irq.h>
  13#include <asm/sn/arch.h>
  14#include <asm/sn/intr.h>
  15#include <asm/sn/bte.h>
  16
  17/*
  18 * NUMA Node-Specific Data structures are defined in this file.
  19 * In particular, this is the location of the node PDA.
  20 * A pointer to the right node PDA is saved in each CPU PDA.
  21 */
  22
  23/*
  24 * Node-specific data structure.
  25 *
  26 * One of these structures is allocated on each node of a NUMA system.
  27 *
  28 * This structure provides a convenient way of keeping together 
  29 * all per-node data structures. 
  30 */
  31struct phys_cpuid {
  32        short                   nasid;
  33        char                    subnode;
  34        char                    slice;
  35};
  36
  37struct nodepda_s {
  38        void            *pdinfo;        /* Platform-dependent per-node info */
  39
  40        /*
  41         * The BTEs on this node are shared by the local cpus
  42         */
  43        struct bteinfo_s        bte_if[MAX_BTES_PER_NODE];      /* Virtual Interface */
  44        struct timer_list       bte_recovery_timer;
  45        spinlock_t              bte_recovery_lock;
  46
  47        /* 
  48         * Array of pointers to the nodepdas for each node.
  49         */
  50        struct nodepda_s        *pernode_pdaindr[MAX_COMPACT_NODES]; 
  51
  52        /*
  53         * Array of physical cpu identifiers. Indexed by cpuid.
  54         */
  55        struct phys_cpuid       phys_cpuid[NR_CPUS];
  56        spinlock_t              ptc_lock ____cacheline_aligned_in_smp;
  57};
  58
  59typedef struct nodepda_s nodepda_t;
  60
  61/*
  62 * Access Functions for node PDA.
  63 * Since there is one nodepda for each node, we need a convenient mechanism
  64 * to access these nodepdas without cluttering code with #ifdefs.
  65 * The next set of definitions provides this.
  66 * Routines are expected to use 
  67 *
  68 *      sn_nodepda   - to access node PDA for the node on which code is running
  69 *      NODEPDA(cnodeid)   - to access node PDA for cnodeid
  70 */
  71
  72DECLARE_PER_CPU(struct nodepda_s *, __sn_nodepda);
  73#define sn_nodepda              __this_cpu_read(__sn_nodepda)
  74#define NODEPDA(cnodeid)        (sn_nodepda->pernode_pdaindr[cnodeid])
  75
  76/*
  77 * Check if given a compact node id the corresponding node has all the
  78 * cpus disabled. 
  79 */
  80#define is_headless_node(cnodeid)       (nr_cpus_node(cnodeid) == 0)
  81
  82#endif /* _ASM_IA64_SN_NODEPDA_H */
  83