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smp.c

/*
 *  PS3 SMP routines.
 *
 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
 *  Copyright 2006 Sony Corp.
 *
 *  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; version 2 of the License.
 *
 *  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.  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/smp.h>

#include <asm/machdep.h>
#include <asm/udbg.h>

#include "platform.h"

#if defined(DEBUG)
#define DBG udbg_printf
#else
#define DBG pr_debug
#endif

static irqreturn_t ipi_function_handler(int irq, void *msg)
{
      smp_message_recv((int)(long)msg);
      return IRQ_HANDLED;
}

/**
  * ps3_ipi_virqs - a per cpu array of virqs for ipi use
  */

#define MSG_COUNT 4
static DEFINE_PER_CPU(unsigned int, ps3_ipi_virqs[MSG_COUNT]);

static const char *names[MSG_COUNT] = {
      "ipi call",
      "ipi reschedule",
      "ipi migrate",
      "ipi debug brk"
};

static void do_message_pass(int target, int msg)
{
      int result;
      unsigned int virq;

      if (msg >= MSG_COUNT) {
            DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg);
            return;
      }

      virq = per_cpu(ps3_ipi_virqs, target)[msg];
      result = ps3_send_event_locally(virq);

      if (result)
            DBG("%s:%d: ps3_send_event_locally(%d, %d) failed"
                  " (%d)\n", __func__, __LINE__, target, msg, result);
}

static void ps3_smp_message_pass(int target, int msg)
{
      int cpu;

      if (target < NR_CPUS)
            do_message_pass(target, msg);
      else if (target == MSG_ALL_BUT_SELF) {
            for_each_online_cpu(cpu)
                  if (cpu != smp_processor_id())
                        do_message_pass(cpu, msg);
      } else {
            for_each_online_cpu(cpu)
                  do_message_pass(cpu, msg);
      }
}

static int ps3_smp_probe(void)
{
      return 2;
}

static void __init ps3_smp_setup_cpu(int cpu)
{
      int result;
      unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
      int i;

      DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);

      /*
       * Check assumptions on ps3_ipi_virqs[] indexing. If this
       * check fails, then a different mapping of PPC_MSG_
       * to index needs to be setup.
       */

      BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION  != 0);
      BUILD_BUG_ON(PPC_MSG_RESCHEDULE     != 1);
      BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK != 3);

      for (i = 0; i < MSG_COUNT; i++) {
            result = ps3_event_receive_port_setup(cpu, &virqs[i]);

            if (result)
                  continue;

            DBG("%s:%d: (%d, %d) => virq %u\n",
                  __func__, __LINE__, cpu, i, virqs[i]);

            result = request_irq(virqs[i], ipi_function_handler,
                  IRQF_DISABLED, names[i], (void*)(long)i);

            if (result)
                  virqs[i] = NO_IRQ;
      }

      ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);

      DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
}

void ps3_smp_cleanup_cpu(int cpu)
{
      unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
      int i;

      DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);

      for (i = 0; i < MSG_COUNT; i++) {
            /* Can't call free_irq from interrupt context. */
            ps3_event_receive_port_destroy(virqs[i]);
            virqs[i] = NO_IRQ;
      }

      DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
}

static struct smp_ops_t ps3_smp_ops = {
      .probe            = ps3_smp_probe,
      .message_pass     = ps3_smp_message_pass,
      .kick_cpu   = smp_generic_kick_cpu,
      .setup_cpu  = ps3_smp_setup_cpu,
};

void smp_init_ps3(void)
{
      DBG(" -> %s\n", __func__);
      smp_ops = &ps3_smp_ops;
      DBG(" <- %s\n", __func__);
}

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