/*
 * include/linux/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 _LINUX_TOPOLOGY_H
#define _LINUX_TOPOLOGY_H

#include <linux/cpumask.h>
#include <linux/bitops.h>
#include <linux/mmzone.h>
#include <linux/smp.h>
#include <asm/topology.h>

#ifndef node_has_online_mem
#define node_has_online_mem(nid) (1)
#endif

#ifndef nr_cpus_node
#define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node))
#endif

#define for_each_node_with_cpus(node)                   \
        for_each_online_node(node)                      \
                if (nr_cpus_node(node))

int arch_update_cpu_topology(void);

/* Conform to ACPI 2.0 SLIT distance definitions */
#define LOCAL_DISTANCE          10
#define REMOTE_DISTANCE         20
#ifndef node_distance
#define node_distance(from,to)  ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
#endif
#ifndef RECLAIM_DISTANCE
/*
 * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
 * (in whatever arch specific measurement units returned by node_distance())
 * then switch on zone reclaim on boot.
 */
#define RECLAIM_DISTANCE 20
#endif
#ifndef PENALTY_FOR_NODE_WITH_CPUS
#define PENALTY_FOR_NODE_WITH_CPUS      (1)
#endif

/*
 * Below are the 3 major initializers used in building sched_domains:
 * SD_SIBLING_INIT, for SMT domains
 * SD_CPU_INIT, for SMP domains
 * SD_NODE_INIT, for NUMA domains
 *
 * Any architecture that cares to do any tuning to these values should do so
 * by defining their own arch-specific initializer in include/asm/topology.h.
 * A definition there will automagically override these default initializers
 * and allow arch-specific performance tuning of sched_domains.
 * (Only non-zero and non-null fields need be specified.)
 */

#ifdef CONFIG_SCHED_SMT
/* MCD - Do we really need this?  It is always on if CONFIG_SCHED_SMT is,
 * so can't we drop this in favor of CONFIG_SCHED_SMT?
 */
#define ARCH_HAS_SCHED_WAKE_IDLE
/* Common values for SMT siblings */
#ifndef SD_SIBLING_INIT
#define SD_SIBLING_INIT (struct sched_domain) {         \
        .min_interval           = 1,                    \
        .max_interval           = 2,                    \
        .busy_factor            = 64,                   \
        .imbalance_pct          = 110,                  \
        .flags                  = SD_LOAD_BALANCE       \
                                | SD_BALANCE_NEWIDLE    \
                                | SD_BALANCE_FORK       \
                                | SD_BALANCE_EXEC       \
                                | SD_WAKE_AFFINE        \
                                | SD_WAKE_BALANCE       \
                                | SD_SHARE_CPUPOWER,    \
        .last_balance           = jiffies,              \
        .balance_interval       = 1,                    \
}
#endif
#endif /* CONFIG_SCHED_SMT */

#ifdef CONFIG_SCHED_MC
/* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
#ifndef SD_MC_INIT
#define SD_MC_INIT (struct sched_domain) {              \
        .min_interval           = 1,                    \
        .max_interval           = 4,                    \
        .busy_factor            = 64,                   \
        .imbalance_pct          = 125,                  \
        .cache_nice_tries       = 1,                    \
        .busy_idx               = 2,                    \
        .wake_idx               = 1,                    \
        .forkexec_idx           = 1,                    \
        .flags                  = SD_LOAD_BALANCE       \
                                | SD_BALANCE_FORK       \
                                | SD_BALANCE_EXEC       \
                                | SD_WAKE_AFFINE        \
                                | SD_WAKE_BALANCE       \
                                | SD_SHARE_PKG_RESOURCES\
                                | sd_balance_for_mc_power()\
                                | sd_power_saving_flags(),\
        .last_balance           = jiffies,              \
        .balance_interval       = 1,                    \
}
#endif
#endif /* CONFIG_SCHED_MC */

/* Common values for CPUs */
#ifndef SD_CPU_INIT
#define SD_CPU_INIT (struct sched_domain) {             \
        .min_interval           = 1,                    \
        .max_interval           = 4,                    \
        .busy_factor            = 64,                   \
        .imbalance_pct          = 125,                  \
        .cache_nice_tries       = 1,                    \
        .busy_idx               = 2,                    \
        .idle_idx               = 1,                    \
        .newidle_idx            = 2,                    \
        .wake_idx               = 1,                    \
        .forkexec_idx           = 1,                    \
        .flags                  = SD_LOAD_BALANCE       \
                                | SD_BALANCE_EXEC       \
                                | SD_BALANCE_FORK       \
                                | SD_WAKE_AFFINE        \
                                | SD_WAKE_BALANCE       \
                                | sd_balance_for_package_power()\
                                | sd_power_saving_flags(),\
        .last_balance           = jiffies,              \
        .balance_interval       = 1,                    \
}
#endif

/* sched_domains SD_ALLNODES_INIT for NUMA machines */
#define SD_ALLNODES_INIT (struct sched_domain) {        \
        .min_interval           = 64,                   \
        .max_interval           = 64*num_online_cpus(), \
        .busy_factor            = 128,                  \
        .imbalance_pct          = 133,                  \
        .cache_nice_tries       = 1,                    \
        .busy_idx               = 3,                    \
        .idle_idx               = 3,                    \
        .flags                  = SD_LOAD_BALANCE       \
                                | SD_BALANCE_NEWIDLE    \
                                | SD_WAKE_AFFINE        \
                                | SD_SERIALIZE,         \
        .last_balance           = jiffies,              \
        .balance_interval       = 64,                   \
}

#ifdef CONFIG_NUMA
#ifndef SD_NODE_INIT
#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
#endif
#endif /* CONFIG_NUMA */

#ifndef topology_physical_package_id
#define topology_physical_package_id(cpu)       ((void)(cpu), -1)
#endif
#ifndef topology_core_id
#define topology_core_id(cpu)                   ((void)(cpu), 0)
#endif
#ifndef topology_thread_siblings
#define topology_thread_siblings(cpu)           cpumask_of_cpu(cpu)
#endif
#ifndef topology_core_siblings
#define topology_core_siblings(cpu)             cpumask_of_cpu(cpu)
#endif
#ifndef topology_thread_cpumask
#define topology_thread_cpumask(cpu)            cpumask_of(cpu)
#endif
#ifndef topology_core_cpumask
#define topology_core_cpumask(cpu)              cpumask_of(cpu)
#endif

/* Returns the number of the current Node. */
#ifndef numa_node_id
#define numa_node_id()          (cpu_to_node(raw_smp_processor_id()))
#endif

#endif /* _LINUX_TOPOLOGY_H */