smp.c

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/*
 *  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

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

static void ps3_smp_message_pass(int cpu, 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, cpu)[msg];
    result = ps3_send_event_locally(virq);

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

static int __init ps3_smp_probe(void)
{
    int cpu;

    for (cpu = 0; cpu < 2; 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_CALL_FUNC_SINGLE != 2);
        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 = smp_request_message_ipi(virqs[i], i);

            if (result)
                virqs[i] = NO_IRQ;
            else
                ps3_register_ipi_irq(cpu, virqs[i]);
        }

        ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);

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

    return 2;
}

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,
};

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