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smp.c

/*
 * SMP support for iSeries machines.
 *
 * Dave Engebretsen, Peter Bergner, and
 * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
 *
 * Plus various changes from other IBM teams...
 *
 *      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.
 */

#undef DEBUG

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/cache.h>
#include <linux/err.h>
#include <linux/sysdev.h>
#include <linux/cpu.h>

#include <asm/ptrace.h>
#include <asm/atomic.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/paca.h>
#include <asm/iseries/hv_call.h>
#include <asm/time.h>
#include <asm/machdep.h>
#include <asm/cputable.h>
#include <asm/system.h>

#include "smp.h"

static unsigned long iSeries_smp_message[NR_CPUS];

void iSeries_smp_message_recv(void)
{
      int cpu = smp_processor_id();
      int msg;

      if (num_online_cpus() < 2)
            return;

      for (msg = 0; msg < 4; msg++)
            if (test_and_clear_bit(msg, &iSeries_smp_message[cpu]))
                  smp_message_recv(msg);
}

static inline void smp_iSeries_do_message(int cpu, int msg)
{
      set_bit(msg, &iSeries_smp_message[cpu]);
      HvCall_sendIPI(&(paca[cpu]));
}

static void smp_iSeries_message_pass(int target, int msg)
{
      int i;

      if (target < NR_CPUS)
            smp_iSeries_do_message(target, msg);
      else {
            for_each_online_cpu(i) {
                  if ((target == MSG_ALL_BUT_SELF) &&
                              (i == smp_processor_id()))
                        continue;
                  smp_iSeries_do_message(i, msg);
            }
      }
}

static int smp_iSeries_probe(void)
{
      return cpus_weight(cpu_possible_map);
}

static void smp_iSeries_kick_cpu(int nr)
{
      BUG_ON((nr < 0) || (nr >= NR_CPUS));

      /* Verify that our partition has a processor nr */
      if (lppaca[nr].dyn_proc_status >= 2)
            return;

      /* The processor is currently spinning, waiting
       * for the cpu_start field to become non-zero
       * After we set cpu_start, the processor will
       * continue on to secondary_start in iSeries_head.S
       */
      paca[nr].cpu_start = 1;
}

static void __devinit smp_iSeries_setup_cpu(int nr)
{
}

static struct smp_ops_t iSeries_smp_ops = {
      .message_pass = smp_iSeries_message_pass,
      .probe        = smp_iSeries_probe,
      .kick_cpu     = smp_iSeries_kick_cpu,
      .setup_cpu    = smp_iSeries_setup_cpu,
};

/* This is called very early. */
void __init smp_init_iSeries(void)
{
      smp_ops = &iSeries_smp_ops;
}

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