serengeti/io/ssm.c

/*
 * 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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/*
 * Copyright 2012 Garrett D'Amore <garrett@damore.org>.  All rights reserved.
 */
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/modctl.h>
#include <sys/sunndi.h>
#include <sys/ddi_impldefs.h>
#include <sys/obpdefs.h>
#include <sys/cmn_err.h>
#include <sys/errno.h>
#include <sys/kmem.h>
#include <sys/debug.h>
#include <sys/sysmacros.h>
#include <sys/autoconf.h>
#include <sys/stat.h>
#include <sys/serengeti.h>
#include <sys/ssm.h>
#include <sys/sgsbbc_mailbox.h>
#include <sys/sgevents.h>
#include <sys/sysevent.h>
#include <sys/sysevent/dr.h>
#include <sys/sysevent/eventdefs.h>
#include <sys/ndi_impldefs.h>
#include <sys/ddifm.h>
#include <sys/ndifm.h>
#include <sys/sbd_ioctl.h>

/* Useful debugging Stuff */
#include <sys/nexusdebug.h>

/*
 * module ssm.c
 *
 * This module is a nexus driver designed to support the ssm nexus driver
 * and all children below it. This driver does not handle any of the
 * DDI functions passed up to it by the ssm driver, but instead allows
 * them to bubble up to the root node.
 */


/*
 * Function prototypes
 */
extern int plat_max_boards();

static int
ssm_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result);

static int
ssm_attach(dev_info_t *, ddi_attach_cmd_t);

static int
ssm_detach(dev_info_t *, ddi_detach_cmd_t);

static int
ssm_open(dev_t *, int, int, cred_t *);

static int
ssm_close(dev_t, int, int, cred_t *);

static int
ssm_ioctl(dev_t, int, intptr_t, int, cred_t *, int *);

static int
ssm_ctlops(dev_info_t *, dev_info_t *, ddi_ctl_enum_t, void *, void *);

static int
ssm_make_nodes(dev_info_t *dip, int instance, int ssm_nodeid);

static int
ssm_generate_event(int node, int board, int hint);

/*
 * FMA error callback
 * Register error handling callback with our parent. We will just call
 * our children's error callbacks and return their status.
 */
static int
ssm_err_callback(dev_info_t *dip, ddi_fm_error_t *derr, const void *impl_data);

/*
 * fm_init busop to initialize our children
 */
static int
ssm_fm_init_child(dev_info_t *dip, dev_info_t *tdip, int cap,
        ddi_iblock_cookie_t *ibc);

/*
 * init/fini routines to alloc/dealloc fm structures and
 * register/unregister our callback.
 */
static void
ssm_fm_init(struct ssm_soft_state *softsp);

static void
ssm_fm_fini(struct ssm_soft_state *softsp);

/*
 * DR event handlers
 * We want to register the event handlers once for all instances. In the
 * other hand we have register them after the sbbc has been attached.
 * event_initialize gives us the logic of only registering the events only
 * once
 */
int event_initialized = 0;
uint_t ssm_dr_event_handler(char *);

/*
 * Event lock and state
 */
static kmutex_t ssm_event_lock;
int ssm_event_state;

/*
 * DR event msg and payload
 */
static sbbc_msg_t event_msg;
static sg_system_fru_descriptor_t payload;

struct ssm_node2inst {
    int nodeid;     /* serengeti node #, NOT prom nodeid */
    int inst;
    struct ssm_node2inst *next;
};
static kmutex_t ssm_node2inst_lock;
static struct ssm_node2inst ssm_node2inst_map = {-1, -1, NULL};


/*
 * Configuration data structures
 */
static struct bus_ops ssm_bus_ops = {
    BUSO_REV,
    ddi_bus_map,        /* map */
    0,          /* get_intrspec */
    0,          /* add_intrspec */
    0,          /* remove_intrspec */
    i_ddi_map_fault,    /* map_fault */
    0,          /* dma_map */
    ddi_dma_allochdl,
    ddi_dma_freehdl,
    ddi_dma_bindhdl,
    ddi_dma_unbindhdl,
    ddi_dma_flush,
    ddi_dma_win,
    ddi_dma_mctl,       /* dma_ctl */
    ssm_ctlops,     /* ctl */
    ddi_bus_prop_op,    /* prop_op */
    ndi_busop_get_eventcookie,
    ndi_busop_add_eventcall,
    ndi_busop_remove_eventcall,
    ndi_post_event,
    0,
    0,
    0,
    ssm_fm_init_child,
    NULL,
    NULL,
    NULL,
    0,
    i_ddi_intr_ops
};

static struct cb_ops ssm_cb_ops = {
    ssm_open,           /* open */
    ssm_close,          /* close */
    nodev,              /* strategy */
    nodev,              /* print */
    nodev,              /* dump */
    nodev,              /* read */
    nodev,              /* write */
    ssm_ioctl,          /* ioctl */
    nodev,              /* devmap */
    nodev,              /* mmap */
    nodev,              /* segmap */
    nochpoll,           /* poll */
    ddi_prop_op,            /* cb_prop_op */
    NULL,               /* streamtab */
    D_NEW | D_MP | D_HOTPLUG,   /* Driver compatibility flag */
    CB_REV,             /* rev */
    nodev,              /* int (*cb_aread)() */
    nodev               /* int (*cb_awrite)() */
};

static struct dev_ops ssm_ops = {
    DEVO_REV,       /* devo_rev, */
    0,          /* refcnt */
    ssm_info,       /* getinfo */
    nulldev,        /* identify */
    nulldev,        /* probe */
    ssm_attach,     /* attach */
    ssm_detach,     /* detach */
    nulldev,        /* reset */
    &ssm_cb_ops,        /* driver operations */
    &ssm_bus_ops,       /* bus_ops */
    nulldev,        /* power */
    ddi_quiesce_not_needed,     /* quiesce */
};

/*
 * Driver globals
 */
static void *ssm_softstates;        /* ssm soft state hook */

extern struct mod_ops mod_driverops;

static struct modldrv modldrv = {
    &mod_driverops,     /* Type of module.  This one is a driver */
    "SSM Nexus",        /* name of module */
    &ssm_ops,       /* driver ops */
};

static struct modlinkage modlinkage = {
    MODREV_1,       /* rev */
    (void *)&modldrv,
    NULL
};

static int ssm_loaded_sbd = FALSE;
kmutex_t ssm_lock;
static int init_child(dev_info_t *child);

/*
 * These are the module initialization routines.
 */

int
_init(void)
{
    int error;

#if defined(DEBUG)
    debug_print_level = 0x0;
#endif

    /* Initialize soft state pointer. */
    if ((error = ddi_soft_state_init(&ssm_softstates,
        sizeof (struct ssm_soft_state), SSM_MAX_INSTANCES)) != 0)
        return (error);

    /* Install the module. */
    error = mod_install(&modlinkage);
    if (error != 0)
        ddi_soft_state_fini(&ssm_softstates);

    mutex_init(&ssm_lock, NULL, MUTEX_DRIVER, NULL);

    return (error);
}

int
_fini(void)
{
    int error;

    /* Remove the module. */
    if ((error = mod_remove(&modlinkage)) != 0)
        return (error);

    /*
     * Unregister the event handler
     */
    (void) sbbc_mbox_unreg_intr(MBOX_EVENT_GENERIC, ssm_dr_event_handler);
    mutex_destroy(&ssm_event_lock);

    /* Free the soft state info. */
    ddi_soft_state_fini(&ssm_softstates);
    mutex_destroy(&ssm_lock);

    return (0);
}

int
_info(struct modinfo *modinfop)
{
    return (mod_info(&modlinkage, modinfop));
}

/* device driver entry points */

/*
 * info entry point:
 */

/* ARGSUSED */
static int
ssm_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
{
    dev_t   dev;
    int instance;

    if (infocmd == DDI_INFO_DEVT2INSTANCE) {
        dev = (dev_t)arg;
        instance = (getminor(dev) >> SSM_INSTANCE_SHIFT);
        *result = (void *)(uintptr_t)instance;
        return (DDI_SUCCESS);
    }
    return (DDI_FAILURE);
}

/*
 * attach entry point:
 */

static int
ssm_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
{
    int instance;
    struct ssm_soft_state *softsp;
    struct ssm_node2inst *prev, *sp, *tsp;

    DPRINTF(SSM_ATTACH_DEBUG, ("ssm_attach\n"));

    switch (cmd) {
    case DDI_ATTACH:
        break;

    case DDI_RESUME:
        return (DDI_SUCCESS);

    default:
        return (DDI_FAILURE);
    }

    instance = ddi_get_instance(devi);

    if (ddi_soft_state_zalloc(ssm_softstates, instance) != DDI_SUCCESS)
        return (DDI_FAILURE);

    softsp = ddi_get_soft_state(ssm_softstates, instance);

    /* Set the dip in the soft state */
    softsp->dip = devi;
    softsp->top_node = devi;
    mutex_init(&softsp->ssm_sft_lock, NULL, MUTEX_DRIVER, NULL);

    DPRINTF(SSM_ATTACH_DEBUG, ("ssm-%d: devi= 0x%p, softsp=0x%p\n",
        instance, (void *)devi, (void *)softsp));

    if ((softsp->ssm_nodeid = (int)ddi_getprop(DDI_DEV_T_ANY, softsp->dip,
        DDI_PROP_DONTPASS, "nodeid", -1)) == -1) {
        cmn_err(CE_WARN, "ssm%d: unable to retrieve %s property",
            instance, "nodeid");
        ddi_soft_state_free(ssm_softstates, instance);
        return (DDI_FAILURE);
    }

    /* nothing to suspend/resume here */
    (void) ddi_prop_create(DDI_DEV_T_NONE, devi, DDI_PROP_CANSLEEP,
        "pm-hardware-state", (caddr_t)"no-suspend-resume",
        strlen("no-suspend-resume") + 1);

#if DEBUG
    if (ddi_create_minor_node(devi, "debug", S_IFCHR, instance,
        DDI_NT_NEXUS, 0) != DDI_SUCCESS) {
        ddi_soft_state_free(ssm_softstates, instance);
        return (DDI_FAILURE);
    }
#endif

    if (ssm_make_nodes(devi, instance, softsp->ssm_nodeid)) {
        cmn_err(CE_WARN, "ssm:%s:%d: failed to make nodes",
            ddi_driver_name(devi), instance);
        ddi_remove_minor_node(devi, NULL);
        ddi_soft_state_free(ssm_softstates, instance);
        return (DDI_FAILURE);
    }
    ssm_fm_init(softsp);
    ddi_report_dev(devi);

    if (event_initialized == 0) {
        int rv;
        /*
         * Register DR event handler
         */
        mutex_init(&ssm_event_lock,  NULL, MUTEX_DRIVER, NULL);
        event_msg.msg_buf = (caddr_t)&payload;
        event_msg.msg_len = sizeof (payload);

        rv = sbbc_mbox_reg_intr(MBOX_EVENT_GENERIC,
            ssm_dr_event_handler, &event_msg,
            (uint_t *)&ssm_event_state, &ssm_event_lock);

        if (rv == EINVAL)
        event_initialized = 1;
    }

    /*
     * Preallocate to avoid sleeping with ssm_node2inst_lock held -
     * low level interrupts use this mutex.
     */
    tsp = kmem_zalloc(sizeof (struct ssm_node2inst), KM_SLEEP);

    mutex_enter(&ssm_node2inst_lock);

    for (prev = NULL, sp = &ssm_node2inst_map; sp != NULL;
        prev = sp, sp = sp->next) {
        ASSERT(sp->inst != instance);
        ASSERT(sp->nodeid != softsp->ssm_nodeid);
        if (sp->inst == -1)
            break;
    }

    if (sp == NULL) {
        ASSERT(prev->next == NULL);
        sp = prev->next = tsp;
        tsp = NULL;
        sp->next = NULL;
    }

    sp->inst = instance;
    sp->nodeid = softsp->ssm_nodeid;

    mutex_exit(&ssm_node2inst_lock);

    if (tsp != NULL)
        kmem_free(tsp, sizeof (struct ssm_node2inst));

    return (DDI_SUCCESS);
}

/*
 * detach entry point:
 */
/*ARGSUSED*/
static int
ssm_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
{
    int instance, rv;
    int (*sbd_teardown_instance) (int, caddr_t);
    ssm_sbdp_info_t sbdp_info;
    struct ssm_soft_state *softsp;
    struct ssm_node2inst *prev, *sp;

    instance = ddi_get_instance(devi);
    softsp = ddi_get_soft_state(ssm_softstates, instance);

    if (softsp == NULL) {
        cmn_err(CE_WARN,
            "ssm_open bad instance number %d", instance);
        return (ENXIO);
    }

    instance = ddi_get_instance(devi);

    switch (cmd) {
    case DDI_DETACH:
        ddi_remove_minor_node(devi, NULL);

        sbd_teardown_instance = (int (*) (int, caddr_t))
            modlookup("misc/sbd", "sbd_teardown_instance");

        if (!sbd_teardown_instance) {
            cmn_err(CE_WARN, "cannot find sbd_teardown_instance");
            return (DDI_FAILURE);
        }

        sbdp_info.instance = instance;
        sbdp_info.wnode = softsp->ssm_nodeid;
        rv = (*sbd_teardown_instance)(instance, (caddr_t)&sbdp_info);

        if (rv != DDI_SUCCESS) {
            cmn_err(CE_WARN, "cannot run sbd_teardown_instance");
            return (DDI_FAILURE);
        }
        ssm_fm_fini(softsp);
        mutex_destroy(&softsp->ssm_sft_lock);
        ddi_soft_state_free(ssm_softstates, instance);

        mutex_enter(&ssm_node2inst_lock);
        for (prev = NULL, sp = &ssm_node2inst_map; sp != NULL;
            prev = sp, sp = sp->next) {
            /* Only the head of the list can persist if unused */
            ASSERT(prev == NULL || sp->inst != -1);
            if (sp->inst == instance)
                break;
        }
        ASSERT(sp != NULL);

        if (sp != &ssm_node2inst_map) {
            prev->next = sp->next;
            kmem_free(sp, sizeof (struct ssm_node2inst));
        } else {
            /*
             * Invalidate the head element, but retain the rest
             * of the list - "next" is still valid.
             */

            sp->nodeid = -1;
            sp->inst = -1;
        }
        mutex_exit(&ssm_node2inst_lock);

        return (DDI_SUCCESS);

    case DDI_SUSPEND:
        return (DDI_SUCCESS);

    default:
        return (DDI_FAILURE);
    }
}

extern void make_ddi_ppd(dev_info_t *, struct ddi_parent_private_data **);
extern struct ddi_parent_private_data *init_regspec_64(dev_info_t *);

static int
name_child(dev_info_t *child, char *name, int namelen)
{
    struct regspec *rp;
    struct ddi_parent_private_data *pdptr;
    int portid = 0;
    int regbase = -1;
    extern uint_t root_phys_addr_lo_mask;

    make_ddi_ppd(child, &pdptr);
    ddi_set_parent_data(child, pdptr);

    name[0] = '\0';
    if (sparc_pd_getnreg(child) == 0)
        return (DDI_SUCCESS);

    rp = sparc_pd_getreg(child, 0);

    portid = ddi_prop_get_int(DDI_DEV_T_ANY, child,
        DDI_PROP_DONTPASS, "portid", -1);
    if (portid == -1) {
        cmn_err(CE_WARN, "could not find portid property in %s",
            DEVI(child)->devi_node_name);
    } else {
        regbase = rp->regspec_addr & root_phys_addr_lo_mask;
    }
    (void) snprintf(name, namelen, "%x,%x", portid, regbase);
    return (DDI_SUCCESS);
}

static int
init_child(dev_info_t *child)
{
    char name[MAXNAMELEN];

    (void) name_child(child, name, MAXNAMELEN);
    ddi_set_name_addr(child, name);
    if ((ndi_dev_is_persistent_node(child) == 0) &&
        (ndi_merge_node(child, name_child) == DDI_SUCCESS)) {
        impl_ddi_sunbus_removechild(child);
        return (DDI_FAILURE);
    }

    (void) init_regspec_64(child);
    return (DDI_SUCCESS);
}

/*
 * Control ops entry point:
 *
 * Requests handled completely:
 *      DDI_CTLOPS_INITCHILD
 *      DDI_CTLOPS_UNINITCHILD
 *  DDI_CTLOPS_REPORTDEV
 * All others are passed to the parent.
 * The name of the ssm node is ssm@nodeid,0.
 * ssm is the equivalent of rootnex.
 */
static int
ssm_ctlops(dev_info_t *dip, dev_info_t *rdip, ddi_ctl_enum_t op, void *arg,
    void *result)
{
    int rval;

    switch (op) {
    case DDI_CTLOPS_INITCHILD: {
        DPRINTF(SSM_CTLOPS_DEBUG, ("DDI_CTLOPS_INITCHILD\n"));
        return (init_child((dev_info_t *)arg));
    }

    case DDI_CTLOPS_UNINITCHILD: {
        DPRINTF(SSM_CTLOPS_DEBUG, ("DDI_CTLOPS_UNINITCHILD\n"));
        impl_ddi_sunbus_removechild((dev_info_t *)arg);
        return (DDI_SUCCESS);
    }

    case DDI_CTLOPS_REPORTDEV: {
        char buf[80];
        char *p = buf;
        dev_info_t *parent;
        int portid;

        DPRINTF(SSM_CTLOPS_DEBUG, ("DDI_CTLOPS_REPORTDEV\n"));
        parent = ddi_get_parent(rdip);

        (void) sprintf(p, "%s%d at %s%d", DEVI(rdip)->devi_name,
            DEVI(rdip)->devi_instance, ddi_get_name(parent),
            ddi_get_instance(parent));
        p += strlen(p);

        /* Fetch Safari Extended Agent ID of this device. */
        portid = (int)ddi_getprop(DDI_DEV_T_ANY, rdip,
            DDI_PROP_DONTPASS, "portid", -1);

        /*
         * If this is one of the ssm children it will have
         * portid property and its parent will be ssm.
         * In this case report Node number and Safari id.
         */
        if (portid != -1 &&
            strcmp("ssm", ddi_get_name(parent)) == 0) {
            struct regspec *rp;
            int node;
            int safid;
            int n;

            rp = sparc_pd_getreg(rdip, 0);
            n = sparc_pd_getnreg(rdip);
            ASSERT(n > 0);

            node  = SG_PORTID_TO_NODEID(portid);
            safid = SG_PORTID_TO_SAFARI_ID(portid);

            (void) strcpy(p, ": ");
            p += strlen(p);

            (void) sprintf(p, "Node %d Safari id %d 0x%x%s",
                node, safid,
                rp->regspec_addr,
                (n > 1 ? "" : " ..."));
            p += strlen(p);
        }

        cmn_err(CE_CONT, "?%s\n", buf);
        rval = DDI_SUCCESS;

        break;
    }

    default:
        rval = ddi_ctlops(dip, rdip, op, arg, result);

        break;
    }

    return (rval);
}

/*ARGSUSED*/
static int
ssm_make_nodes(dev_info_t *dip, int instance, int ssm_nodeid)
{
    int     rv;
    minor_t     minor_num, bd;
    auto char   filename[20];

    for (bd = 0; bd < plat_max_boards(); bd++) {
        if (SG_BOARD_IS_CPU_TYPE(bd))
            (void) sprintf(filename, "N%d.SB%d", ssm_nodeid, bd);
        else
            (void) sprintf(filename, "N%d.IB%d", ssm_nodeid, bd);

        minor_num = (instance << SSM_INSTANCE_SHIFT) | bd;

        rv = ddi_create_minor_node(dip, filename, S_IFCHR,
            minor_num, DDI_NT_SBD_ATTACHMENT_POINT, NULL);
        if (rv == DDI_FAILURE) {
            cmn_err(CE_WARN,
                "ssm_make_nodes:%d: failed to create "
                "minor node (%s, 0x%x)",
                instance, filename, minor_num);
            return (-1);
        }
    }

    return (0);
}


/* ARGSUSED */
static int
ssm_open(dev_t *devi, int flags, int otyp, cred_t *credp)
{
    struct ssm_soft_state *softsp;
    minor_t board, instance;
    int (*sbd_setup_instance)(int, dev_info_t *, int, int, caddr_t);
    ssm_sbdp_info_t sbdp_info;
    int rv;

    instance = (getminor(*devi) >> SSM_INSTANCE_SHIFT);

    softsp = ddi_get_soft_state(ssm_softstates, instance);
    if (softsp == NULL) {
        cmn_err(CE_WARN, "ssm_open bad instance number %d", instance);
        return (ENXIO);
    }

    board = (getminor(*devi) & SSM_BOARD_MASK);

    if (board < 0 || board > plat_max_boards()) {
        return (ENXIO);
    }

    mutex_enter(&ssm_lock);
    if (instance == 0 && ssm_loaded_sbd == FALSE) {

        if (modload("misc", "sbd") == -1) {
            cmn_err(CE_WARN, "ssm_open: cannot load sbd");
            mutex_exit(&ssm_lock);
            return (EIO);
        }
        ssm_loaded_sbd = TRUE;
    }
    mutex_exit(&ssm_lock);

    mutex_enter(&softsp->ssm_sft_lock);
    if (softsp->initialized == FALSE) {

        if (softsp->top_node == NULL) {
            cmn_err(CE_WARN, "cannot find ssm top dnode");
            mutex_exit(&softsp->ssm_sft_lock);
            return (EIO);
        }

        sbd_setup_instance = (int (*)(int, dev_info_t *, int, int,
            caddr_t))modlookup("misc/sbd", "sbd_setup_instance");

        if (!sbd_setup_instance) {
            cmn_err(CE_WARN, "cannot find sbd_setup_instance");
            mutex_exit(&softsp->ssm_sft_lock);
            return (EIO);
        }

        sbdp_info.instance = instance;
        sbdp_info.wnode = softsp->ssm_nodeid;

        rv = (*sbd_setup_instance)(instance, softsp->top_node,
            plat_max_boards(), softsp->ssm_nodeid,
            (caddr_t)&sbdp_info);
        if (rv != DDI_SUCCESS) {
            cmn_err(CE_WARN, "cannot run sbd_setup_instance");
            mutex_exit(&softsp->ssm_sft_lock);
            return (EIO);
        }
        softsp->initialized = TRUE;
    }
    mutex_exit(&softsp->ssm_sft_lock);

    return (DDI_SUCCESS);
}


/* ARGSUSED */
static int
ssm_close(dev_t dev, int flags, int otyp, cred_t *credp)
{
    struct ssm_soft_state *softsp;
    minor_t board, instance;

    instance = (getminor(dev) >> SSM_INSTANCE_SHIFT);

    softsp = ddi_get_soft_state(ssm_softstates, instance);
    if (softsp == NULL)
        return (ENXIO);

    board = (getminor(dev) & SSM_BOARD_MASK);

    if (board < 0 || board > plat_max_boards())
        return (ENXIO);

    return (DDI_SUCCESS);
}

/* ARGSUSED */
static int
ssm_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp,
    int *rvalp)
{
    struct ssm_soft_state *softsp;
    char *addr;
    struct devctl_iocdata *dcp;
    int instance, rv = 0;
    int (*sbd_ioctl) (dev_t, int, intptr_t, int, char *);

    instance = (getminor(dev) >> SSM_INSTANCE_SHIFT);
    softsp = ddi_get_soft_state(ssm_softstates, instance);
    if (softsp == NULL)
        return (ENXIO);

    switch (cmd) {

    case DEVCTL_BUS_CONFIGURE:
        /*
         * read devctl ioctl data
         */
        if (ndi_dc_allochdl((void *)arg, &dcp) != NDI_SUCCESS)
            return (EFAULT);

        addr = ndi_dc_getaddr(dcp);
        cmn_err(CE_NOTE,
            "DEVCTL_BUS_CONFIGURE: device id is %s\n", addr);
        ndi_dc_freehdl(dcp);
        break;

    case DEVCTL_BUS_UNCONFIGURE:
        if (ndi_dc_allochdl((void *)arg, &dcp) != NDI_SUCCESS)
            return (EFAULT);

        addr = ndi_dc_getaddr(dcp);
        cmn_err(CE_NOTE,
            "DEVCTL_BUS_UNCONFIGURE: device id is %s\n", addr);
        ndi_dc_freehdl(dcp);
        break;

#ifdef DEBUG
    case SSM_TEARDOWN_SBD: {
        ssm_sbdp_info_t sbdp_info;
        int (*sbd_teardown_instance) (int, caddr_t);
        sbd_teardown_instance = (int (*) (int, caddr_t))
            modlookup("misc/sbd", "sbd_teardown_instance");

        if (!sbd_teardown_instance) {
            cmn_err(CE_WARN, "cannot find sbd_teardown_instance");
            return (EFAULT);
        }

        sbdp_info.instance = instance;
        sbdp_info.wnode = softsp->ssm_nodeid;
        rv = (*sbd_teardown_instance)(instance, (caddr_t)&sbdp_info);
        if (rv != DDI_SUCCESS) {
            cmn_err(CE_WARN, "cannot run sbd_teardown_instance");
            return (EFAULT);
        }

        ssm_loaded_sbd = FALSE;
        softsp->initialized = FALSE;
    }
#endif


    default: {
        char    event = 0;

        sbd_ioctl = (int (*) (dev_t, int, intptr_t, int, char *))
            modlookup("misc/sbd", "sbd_ioctl");

        if (sbd_ioctl)
            rv = (*sbd_ioctl) (dev, cmd, arg, mode, &event);
        else {
            cmn_err(CE_WARN, "cannot find sbd_ioctl");
            return (ENXIO);
        }
        /*
         * Check to see if we need to send an event
         */
        if (event == 1) {
            int slot;
            int hint = SE_NO_HINT;

            if (rv == 0) {
                if (cmd == SBD_CMD_CONNECT ||
                    cmd == SBD_CMD_CONFIGURE)
                    hint = SE_HINT_INSERT;
                else if (cmd == SBD_CMD_UNCONFIGURE ||
                    cmd == SBD_CMD_DISCONNECT)
                    hint = SE_HINT_REMOVE;
            }

            slot = (getminor(dev) & SSM_BOARD_MASK);
            (void) ssm_generate_event(softsp->ssm_nodeid, slot,
                hint);
        }
        break;
    }
    }

    return (rv);
}

void
ssm_get_attch_pnt(int node, int board, char *attach_pnt)
{
    struct ssm_node2inst    *sp;

    /*
     * Hold this mutex, until we are done so that ssm dip
     * doesn't detach.
     */
    mutex_enter(&ssm_node2inst_lock);

    for (sp = &ssm_node2inst_map; sp != NULL; sp = sp->next) {
        if (sp->inst == -1)
            continue;
        if (sp->nodeid == node)
            break;
    }

    if (sp == NULL) {
        /* We didn't find the ssm dip, return failure */
        attach_pnt[0] = '\0';
        mutex_exit(&ssm_node2inst_lock);
        return;
    }

    /*
     * we have the instance, and the board, construct the attch pnt
     */
    if (SG_BOARD_IS_CPU_TYPE(board))
        (void) sprintf(attach_pnt, "ssm%d:N%d.SB%d",
            sp->inst, node, board);
    else
        (void) sprintf(attach_pnt, "ssm%d:N%d.IB%d",
            sp->inst, node, board);

    mutex_exit(&ssm_node2inst_lock);
}

/*
 * Generate an event to sysevent
 */
static int
ssm_generate_event(int node, int board, int hint)
{
    sysevent_t          *ev;
    sysevent_id_t           eid;
    int             rv = 0;
    sysevent_value_t        evnt_val;
    sysevent_attr_list_t        *evnt_attr_list = NULL;
    char                attach_pnt[MAXPATHLEN];


    attach_pnt[0] = '\0';
    ssm_get_attch_pnt(node, board, attach_pnt);

    if (attach_pnt[0] == '\0')
        return (-1);

    ev = sysevent_alloc(EC_DR, ESC_DR_AP_STATE_CHANGE, EP_DDI,
        KM_SLEEP);
    evnt_val.value_type = SE_DATA_TYPE_STRING;
    evnt_val.value.sv_string = attach_pnt;

    rv = sysevent_add_attr(&evnt_attr_list, DR_AP_ID, &evnt_val, KM_SLEEP);
    if (rv != 0) {
        cmn_err(CE_WARN, "Failed to add attr [%s] for %s event",
            DR_AP_ID, EC_DR);
        sysevent_free(ev);
        return (rv);
    }

    /*
     * Add the hint
     */
    evnt_val.value_type = SE_DATA_TYPE_STRING;
    evnt_val.value.sv_string = SE_HINT2STR(hint);

    rv = sysevent_add_attr(&evnt_attr_list, DR_HINT, &evnt_val, KM_SLEEP);
    if (rv != 0) {
        cmn_err(CE_WARN, "Failed to add attr [%s] for %s event",
            DR_HINT, EC_DR);
        sysevent_free_attr(evnt_attr_list);
        sysevent_free(ev);
        return (-1);
    }

    if (sysevent_attach_attributes(ev, evnt_attr_list) != 0) {
        cmn_err(CE_WARN, "Failed to attach attr list for %s event",
            EC_DR);
        sysevent_free_attr(evnt_attr_list);
        sysevent_free(ev);
        return (-1);
    }

    rv = log_sysevent(ev, KM_NOSLEEP, &eid);
    if (rv != 0) {
        cmn_err(CE_WARN, "ssm_dr_event_handler: failed to log event");
    }

    sysevent_free(ev);

    return (rv);
}

/*
 * DR Event Handler
 */
uint_t
ssm_dr_event_handler(char *arg)
{
    sg_system_fru_descriptor_t  *fdp;
    int             hint;


    fdp = (sg_system_fru_descriptor_t *)(((sbbc_msg_t *)arg)->msg_buf);
    if (fdp == NULL) {
        DPRINTF(SSM_EVENT_DEBUG,
            ("ssm_dr_event_handler: ARG is null\n"));
        return (DDI_INTR_CLAIMED);
    }
#ifdef DEBUG
    DPRINTF(SSM_EVENT_DEBUG, ("ssm_dr_event_handler called\n"));
    DPRINTF(SSM_EVENT_DEBUG, ("\tnode\t%d\n", fdp->node));
    DPRINTF(SSM_EVENT_DEBUG, ("\tslot\t%d\n", fdp->slot));
    DPRINTF(SSM_EVENT_DEBUG, ("\tparent_hdl\t0x%lx\n", fdp->parent_hdl));
    DPRINTF(SSM_EVENT_DEBUG, ("\tchild_hdl\t0x%lx\n", fdp->child_hdl));
    DPRINTF(SSM_EVENT_DEBUG, ("\tevent_details\t%s\n",
        EVNT2STR(fdp->event_details)));
#endif

    switch (fdp->event_details) {
    case SG_EVT_BOARD_ABSENT:
        hint = SE_HINT_REMOVE;
        break;
    case SG_EVT_BOARD_PRESENT:
        hint = SE_HINT_INSERT;
        break;
    default:
        hint = SE_NO_HINT;
        break;

    }

    (void) ssm_generate_event(fdp->node, fdp->slot, hint);

    return (DDI_INTR_CLAIMED);
}

/*
 * Initialize our FMA resources
 */
static void
ssm_fm_init(struct ssm_soft_state *softsp)
{
    softsp->ssm_fm_cap = DDI_FM_EREPORT_CAPABLE | DDI_FM_ERRCB_CAPABLE |
        DDI_FM_ACCCHK_CAPABLE | DDI_FM_DMACHK_CAPABLE;

    /*
     * Request or capability level and get our parents capability
     * and ibc.
     */
    ddi_fm_init(softsp->dip, &softsp->ssm_fm_cap, &softsp->ssm_fm_ibc);
    ASSERT((softsp->ssm_fm_cap & DDI_FM_EREPORT_CAPABLE) &&
        (softsp->ssm_fm_cap & DDI_FM_ERRCB_CAPABLE));
    /*
     * Register error callback with our parent.
     */
    ddi_fm_handler_register(softsp->dip, ssm_err_callback, NULL);
}

/*
 * Breakdown our FMA resources
 */
static void
ssm_fm_fini(struct ssm_soft_state *softsp)
{
    /*
     * Clean up allocated fm structures
     */
    ASSERT(softsp->ssm_fm_cap & DDI_FM_EREPORT_CAPABLE);
    ddi_fm_handler_unregister(softsp->dip);
    ddi_fm_fini(softsp->dip);
}

/*
 * Initialize FMA resources for children devices. Called when
 * child calls ddi_fm_init().
 */
/*ARGSUSED*/
static int
ssm_fm_init_child(dev_info_t *dip, dev_info_t *tdip, int cap,
        ddi_iblock_cookie_t *ibc)
{
    struct ssm_soft_state *softsp = ddi_get_soft_state(ssm_softstates,
        ddi_get_instance(dip));

    *ibc = softsp->ssm_fm_ibc;
    return (softsp->ssm_fm_cap);
}

/*
 * FMA registered error callback
 */
/*ARGSUSED*/
static int
ssm_err_callback(dev_info_t *dip, ddi_fm_error_t *derr, const void *impl_data)
{
    /* Call our children error handlers */
    return (ndi_fm_handler_dispatch(dip, NULL, derr));
}