sun4u/os/mach_mp_startup.c

	mach_mp_startup.c revision 5cff782560a1c3cf913ba5574a5123a299f3315e
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/machsystm.h>
#include <sys/cpu_module.h>
#include <sys/dtrace.h>
#include <sys/cpu_sgnblk_defs.h>

/*
 * Useful for disabling MP bring-up for an MP capable kernel
 * (a kernel that was built with MP defined)
 */
int use_mp = 1;         /* set to come up mp */

/*
 * Init CPU info - get CPU type info for processor_info system call.
 */
void
init_cpu_info(struct cpu *cp)
{
    processor_info_t *pi = &cp->cpu_type_info;
    int cpuid = cp->cpu_id;
    struct cpu_node *cpunode = &cpunodes[cpuid];
    char buf[CPU_IDSTRLEN];

    cp->cpu_fpowner = NULL;     /* not used for V9 */

    /*
     * Get clock-frequency property from cpunodes[] for the CPU.
     */
    pi->pi_clock = (cpunode->clock_freq + 500000) / 1000000;

    /*
     * Current frequency in Hz.
     */
    pi->pi_curr_clock = cpunode->clock_freq;

    (void) strcpy(pi->pi_processor_type, "sparcv9");
    (void) strcpy(pi->pi_fputypes, "sparcv9");

    (void) snprintf(buf, sizeof (buf),
        "%s (portid %d impl 0x%x ver 0x%x clock %d MHz)",
        cpunode->name, cpunode->portid,
        cpunode->implementation, cpunode->version, pi->pi_clock);

    cp->cpu_idstr = kmem_alloc(strlen(buf) + 1, KM_SLEEP);
    (void) strcpy(cp->cpu_idstr, buf);

    cmn_err(CE_CONT, "?cpu%d: %s\n", cpuid, cp->cpu_idstr);

    cp->cpu_brandstr = kmem_alloc(strlen(cpunode->name) + 1, KM_SLEEP);
    (void) strcpy(cp->cpu_brandstr, cpunode->name);

    /*
     * StarFire requires the signature block stuff setup here
     */
    CPU_SGN_MAPIN(cpuid);
    if (cpuid == cpu0.cpu_id) {
        /*
         * cpu0 starts out running.  Other cpus are
         * still in OBP land and we will leave them
         * alone for now.
         */
        CPU_SIGNATURE(OS_SIG, SIGST_RUN, SIGSUBST_NULL, cpuid);
#ifdef  lint
        cpuid = cpuid;
#endif  /* lint */
    }
}

/*
 * Routine used to cleanup a CPU that has been powered off.  This will
 * destroy all per-cpu information related to this cpu.
 */
int
mp_cpu_unconfigure(int cpuid)
{
    int retval;
    void empty_cpu(int);
    extern int cleanup_cpu_common(int);

    ASSERT(MUTEX_HELD(&cpu_lock));

    retval = cleanup_cpu_common(cpuid);

    empty_cpu(cpuid);

    return (retval);
}

struct mp_find_cpu_arg {
    int cpuid;      /* set by mp_cpu_configure() */
    dev_info_t *dip;    /* set by mp_find_cpu() */
};

int
mp_find_cpu(dev_info_t *dip, void *arg)
{
    extern int get_portid_ddi(dev_info_t *, dev_info_t **);
    struct mp_find_cpu_arg *target = (struct mp_find_cpu_arg *)arg;
    char *type;
    int rv = DDI_WALK_CONTINUE;
    int cpuid;

    if (ddi_prop_lookup_string(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS,
        "device_type", &type))
        return (DDI_WALK_CONTINUE);

    if (strcmp(type, "cpu") != 0)
        goto out;

    cpuid = ddi_prop_get_int(DDI_DEV_T_ANY, dip,
        DDI_PROP_DONTPASS, "cpuid", -1);

    if (cpuid == -1)
        cpuid = get_portid_ddi(dip, NULL);
    if (cpuid != target->cpuid)
        goto out;

    /* Found it */
    rv = DDI_WALK_TERMINATE;
    target->dip = dip;

out:
    ddi_prop_free(type);
    return (rv);
}

/*
 * Routine used to setup a newly inserted CPU in preparation for starting
 * it running code.
 */
int
mp_cpu_configure(int cpuid)
{
    extern void fill_cpu_ddi(dev_info_t *);
    extern int setup_cpu_common(int);
    struct mp_find_cpu_arg target;

    ASSERT(MUTEX_HELD(&cpu_lock));

    target.dip = NULL;
    target.cpuid = cpuid;
    ddi_walk_devs(ddi_root_node(), mp_find_cpu, &target);

    if (target.dip == NULL)
        return (ENODEV);

    /*
     * Note:  uses cpu_lock to protect cpunodes and ncpunodes
     * which will be modified inside of fill_cpu_ddi().
     */
    fill_cpu_ddi(target.dip);

    /*
     * sun4v cpu setup may fail. sun4u assumes cpu setup to
     * be always successful, so the return value is ignored.
     */
    (void) setup_cpu_common(cpuid);

    return (0);
}