io/px/px.c

	px.c revision 6e8a7b447bf994515a78a52e5b06ed1eec552e9e
/*
 * 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"

/*
 * PCI Express nexus driver interface
 */

#include <sys/types.h>
#include <sys/conf.h>       /* nulldev */
#include <sys/stat.h>       /* devctl */
#include <sys/kmem.h>
#include <sys/sunddi.h>
#include <sys/sunndi.h>
#include <sys/ddi_impldefs.h>
#include <sys/ddi_subrdefs.h>
#include <sys/spl.h>
#include <sys/epm.h>
#include <sys/iommutsb.h>
#include <sys/hotplug/pci/pcihp.h>
#include <sys/hotplug/pci/pciehpc.h>
#include "px_obj.h"
#include <sys/pci_tools.h>
#include "px_tools_ext.h"
#include "pcie_pwr.h"

/*LINTLIBRARY*/

/*
 * function prototypes for dev ops routines:
 */
static int px_attach(dev_info_t *dip, ddi_attach_cmd_t cmd);
static int px_detach(dev_info_t *dip, ddi_detach_cmd_t cmd);
static int px_info(dev_info_t *dip, ddi_info_cmd_t infocmd,
    void *arg, void **result);
static int px_cb_attach(px_t *);
static void px_cb_detach(px_t *);
static int px_pwr_setup(dev_info_t *dip);
static void px_pwr_teardown(dev_info_t *dip);

extern errorq_t *pci_target_queue;

/*
 * function prototypes for hotplug routines:
 */
static int px_init_hotplug(px_t *px_p);
static int px_uninit_hotplug(dev_info_t *dip);

/*
 * bus ops and dev ops structures:
 */
static struct bus_ops px_bus_ops = {
    BUSO_REV,
    px_map,
    0,
    0,
    0,
    i_ddi_map_fault,
    px_dma_setup,
    px_dma_allochdl,
    px_dma_freehdl,
    px_dma_bindhdl,
    px_dma_unbindhdl,
    px_lib_dma_sync,
    px_dma_win,
    px_dma_ctlops,
    px_ctlops,
    ddi_bus_prop_op,
    ndi_busop_get_eventcookie,
    ndi_busop_add_eventcall,
    ndi_busop_remove_eventcall,
    ndi_post_event,
    NULL,
    NULL,           /* (*bus_config)(); */
    NULL,           /* (*bus_unconfig)(); */
    px_fm_init_child,   /* (*bus_fm_init)(); */
    NULL,           /* (*bus_fm_fini)(); */
    px_bus_enter,       /* (*bus_fm_access_enter)(); */
    px_bus_exit,        /* (*bus_fm_access_fini)(); */
    pcie_bus_power,     /* (*bus_power)(); */
    px_intr_ops     /* (*bus_intr_op)(); */
};

extern struct cb_ops px_cb_ops;

static struct dev_ops px_ops = {
    DEVO_REV,
    0,
    px_info,
    nulldev,
    0,
    px_attach,
    px_detach,
    nodev,
    &px_cb_ops,
    &px_bus_ops,
    nulldev
};

/*
 * module definitions:
 */
#include <sys/modctl.h>
extern struct mod_ops mod_driverops;

static struct modldrv modldrv = {
    &mod_driverops,         /* Type of module - driver */
    "PCI Express nexus driver %I%", /* Name of module. */
    &px_ops,            /* driver ops */
};

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

/* driver soft state */
void *px_state_p;

int
_init(void)
{
    int e;

    /*
     * Initialize per-px bus soft state pointer.
     */
    e = ddi_soft_state_init(&px_state_p, sizeof (px_t), 1);
    if (e != DDI_SUCCESS)
        return (e);

    /*
     * Install the module.
     */
    e = mod_install(&modlinkage);
    if (e != DDI_SUCCESS)
        ddi_soft_state_fini(&px_state_p);
    return (e);
}

int
_fini(void)
{
    int e;

    /*
     * Remove the module.
     */
    e = mod_remove(&modlinkage);
    if (e != DDI_SUCCESS)
        return (e);
    /*
     * Destroy pci_target_queue, and set it to NULL.
     */
    if (pci_target_queue)
        errorq_destroy(pci_target_queue);

    pci_target_queue = NULL;

    /* Free px soft state */
    ddi_soft_state_fini(&px_state_p);

    return (e);
}

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

/* ARGSUSED */
static int
px_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
{
    int instance = getminor((dev_t)arg);
    px_t    *px_p = INST_TO_STATE(instance);

    /*
     * Allow hotplug to deal with ones it manages
     * Hot Plug will be done later.
     */
    if (px_p && (px_p->px_dev_caps & PX_HOTPLUG_CAPABLE))
        return (pcihp_info(dip, infocmd, arg, result));

    /* non-hotplug or not attached */
    switch (infocmd) {
    case DDI_INFO_DEVT2INSTANCE:
        *result = (void *)(intptr_t)instance;
        return (DDI_SUCCESS);

    case DDI_INFO_DEVT2DEVINFO:
        if (px_p == NULL)
            return (DDI_FAILURE);
        *result = (void *)px_p->px_dip;
        return (DDI_SUCCESS);

    default:
        return (DDI_FAILURE);
    }
}

/* device driver entry points */
/*
 * attach entry point:
 */
/*ARGSUSED*/
static int
px_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
    px_t        *px_p;  /* per bus state pointer */
    int     instance = DIP_TO_INST(dip);
    int     ret = DDI_SUCCESS;
    devhandle_t dev_hdl = NULL;

    switch (cmd) {
    case DDI_ATTACH:
        DBG(DBG_ATTACH, dip, "DDI_ATTACH\n");

        /*
         * Allocate and get the per-px soft state structure.
         */
        if (ddi_soft_state_zalloc(px_state_p, instance)
            != DDI_SUCCESS) {
            cmn_err(CE_WARN, "%s%d: can't allocate px state",
                ddi_driver_name(dip), instance);
            goto err_bad_px_softstate;
        }
        px_p = INST_TO_STATE(instance);
        px_p->px_dip = dip;
        mutex_init(&px_p->px_mutex, NULL, MUTEX_DRIVER, NULL);
        px_p->px_soft_state = PX_SOFT_STATE_CLOSED;
        px_p->px_open_count = 0;

        (void) ddi_prop_update_string(DDI_DEV_T_NONE, dip,
                "device_type", "pciex");

        /* Initialize px_dbg for high pil printing */
        px_dbg_attach(dip, &px_p->px_dbg_hdl);

        /*
         * Get key properties of the pci bridge node and
         * determine it's type (psycho, schizo, etc ...).
         */
        if (px_get_props(px_p, dip) == DDI_FAILURE)
            goto err_bad_px_prop;

        if (px_lib_dev_init(dip, &dev_hdl) != DDI_SUCCESS)
            goto err_bad_dev_init;

        /* Initialize device handle */
        px_p->px_dev_hdl = dev_hdl;

        px_p->px_dq_p = (pf_data_t *)
            kmem_zalloc(sizeof (pf_data_t) * pf_get_dq_size(),
            KM_SLEEP);

        px_p->px_dq_tail = -1;

        /*
         * Initialize interrupt block.  Note that this
         * initialize error handling for the PEC as well.
         */
        if ((ret = px_ib_attach(px_p)) != DDI_SUCCESS)
            goto err_bad_ib;

        if (px_cb_attach(px_p) != DDI_SUCCESS)
            goto err_bad_cb;

        /*
         * Start creating the modules.
         * Note that attach() routines should
         * register and enable their own interrupts.
         */

        if ((px_mmu_attach(px_p)) != DDI_SUCCESS)
            goto err_bad_mmu;

        if ((px_msiq_attach(px_p)) != DDI_SUCCESS)
            goto err_bad_msiq;

        if ((px_msi_attach(px_p)) != DDI_SUCCESS)
            goto err_bad_msi;

        if ((px_pec_attach(px_p)) != DDI_SUCCESS)
            goto err_bad_pec;

        if ((px_dma_attach(px_p)) != DDI_SUCCESS)
            goto err_bad_dma; /* nothing to uninitialize on DMA */

        if ((px_fm_attach(px_p)) != DDI_SUCCESS)
            goto err_bad_dma;

        /*
         * All of the error handlers have been registered
         * by now so it's time to activate the interrupt.
         */
        if ((ret = px_err_add_intr(&px_p->px_fault)) != DDI_SUCCESS)
            goto err_bad_intr;

        (void) px_init_hotplug(px_p);

        /*
         * Create the "devctl" node for hotplug and pcitool support.
         * For non-hotplug bus, we still need ":devctl" to
         * support DEVCTL_DEVICE_* and DEVCTL_BUS_* ioctls.
         */
        if (ddi_create_minor_node(dip, "devctl", S_IFCHR,
            PCIHP_AP_MINOR_NUM(instance, PCIHP_DEVCTL_MINOR),
            DDI_NT_NEXUS, 0) != DDI_SUCCESS) {
            goto err_bad_devctl_node;
        }

        if (pxtool_init(dip) != DDI_SUCCESS)
            goto err_bad_pcitool_node;

        /*
         * power management setup. Even if it fails, attach will
         * succeed as this is a optional feature. Since we are
         * always at full power, this is not critical.
         */
        if (pwr_common_setup(dip) != DDI_SUCCESS) {
            DBG(DBG_PWR, dip, "pwr_common_setup failed\n");
        } else if (px_pwr_setup(dip) != DDI_SUCCESS) {
            DBG(DBG_PWR, dip, "px_pwr_setup failed \n");
            pwr_common_teardown(dip);
        }

        /*
         * add cpr callback
         */
        px_cpr_add_callb(px_p);

        ddi_report_dev(dip);

        px_p->px_state = PX_ATTACHED;
        DBG(DBG_ATTACH, dip, "attach success\n");
        break;

err_bad_pcitool_node:
        ddi_remove_minor_node(dip, "devctl");
err_bad_devctl_node:
        px_err_rem_intr(&px_p->px_fault);
err_bad_intr:
        px_fm_detach(px_p);
err_bad_dma:
        px_pec_detach(px_p);
err_bad_pec:
        px_msi_detach(px_p);
err_bad_msi:
        px_msiq_detach(px_p);
err_bad_msiq:
        px_mmu_detach(px_p);
err_bad_mmu:
        px_cb_detach(px_p);
err_bad_cb:
        px_ib_detach(px_p);
err_bad_ib:
        (void) px_lib_dev_fini(dip);
err_bad_dev_init:
        px_free_props(px_p);
err_bad_px_prop:
        px_dbg_detach(dip, &px_p->px_dbg_hdl);
        mutex_destroy(&px_p->px_mutex);
        ddi_soft_state_free(px_state_p, instance);
err_bad_px_softstate:
        ret = DDI_FAILURE;
        break;

    case DDI_RESUME:
        DBG(DBG_ATTACH, dip, "DDI_RESUME\n");

        px_p = INST_TO_STATE(instance);

        mutex_enter(&px_p->px_mutex);

        /* suspend might have not succeeded */
        if (px_p->px_state != PX_SUSPENDED) {
            DBG(DBG_ATTACH, px_p->px_dip,
                "instance NOT suspended\n");
            ret = DDI_FAILURE;
            break;
        }

        px_msiq_resume(px_p);
        px_lib_resume(dip);
        (void) pcie_pwr_resume(dip);
        px_p->px_state = PX_ATTACHED;

        mutex_exit(&px_p->px_mutex);

        break;
    default:
        DBG(DBG_ATTACH, dip, "unsupported attach op\n");
        ret = DDI_FAILURE;
        break;
    }

    return (ret);
}

/*
 * detach entry point:
 */
/*ARGSUSED*/
static int
px_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
    int instance = ddi_get_instance(dip);
    px_t *px_p = INST_TO_STATE(instance);
    int ret;

    /*
     * Make sure we are currently attached
     */
    if (px_p->px_state != PX_ATTACHED) {
        DBG(DBG_DETACH, dip, "Instance not attached\n");
        return (DDI_FAILURE);
    }

    mutex_enter(&px_p->px_mutex);

    switch (cmd) {
    case DDI_DETACH:
        DBG(DBG_DETACH, dip, "DDI_DETACH\n");

        /*
         * remove cpr callback
         */
        px_cpr_rem_callb(px_p);

        if (px_p->px_dev_caps & PX_HOTPLUG_CAPABLE)
            if (px_uninit_hotplug(dip) != DDI_SUCCESS) {
                mutex_exit(&px_p->px_mutex);
                return (DDI_FAILURE);
            }

        /*
         * things which used to be done in obj_destroy
         * are now in-lined here.
         */

        px_p->px_state = PX_DETACHED;

        pxtool_uninit(dip);

        ddi_remove_minor_node(dip, "devctl");
        px_err_rem_intr(&px_p->px_fault);
        px_fm_detach(px_p);
        px_pec_detach(px_p);
        px_pwr_teardown(dip);
        pwr_common_teardown(dip);
        px_msi_detach(px_p);
        px_msiq_detach(px_p);
        px_mmu_detach(px_p);
        px_cb_detach(px_p);
        px_ib_detach(px_p);
        (void) px_lib_dev_fini(dip);

        kmem_free(px_p->px_dq_p, sizeof (pf_data_t) *
            pf_get_dq_size());

        /*
         * Free the px soft state structure and the rest of the
         * resources it's using.
         */
        px_free_props(px_p);
        px_dbg_detach(dip, &px_p->px_dbg_hdl);
        mutex_exit(&px_p->px_mutex);
        mutex_destroy(&px_p->px_mutex);

        /* Free the interrupt-priorities prop if we created it. */ {
            int len;

            if (ddi_getproplen(DDI_DEV_T_ANY, dip,
                DDI_PROP_NOTPROM | DDI_PROP_DONTPASS,
                "interrupt-priorities", &len) == DDI_PROP_SUCCESS)
                (void) ddi_prop_remove(DDI_DEV_T_NONE, dip,
                    "interrupt-priorities");
        }

        px_p->px_dev_hdl = NULL;
        ddi_soft_state_free(px_state_p, instance);

        return (DDI_SUCCESS);

    case DDI_SUSPEND:
        if (pcie_pwr_suspend(dip) != DDI_SUCCESS) {
            mutex_exit(&px_p->px_mutex);
            return (DDI_FAILURE);
        }
        if ((ret = px_lib_suspend(dip)) == DDI_SUCCESS)
            px_p->px_state = PX_SUSPENDED;
        mutex_exit(&px_p->px_mutex);

        return (ret);

    default:
        DBG(DBG_DETACH, dip, "unsupported detach op\n");
        mutex_exit(&px_p->px_mutex);
        return (DDI_FAILURE);
    }
}

int
px_cb_attach(px_t *px_p)
{
    px_fault_t  *fault_p = &px_p->px_cb_fault;
    dev_info_t  *dip = px_p->px_dip;
    sysino_t    sysino;

    if (px_lib_intr_devino_to_sysino(dip,
        px_p->px_inos[PX_INTR_XBC], &sysino) != DDI_SUCCESS)
        return (DDI_FAILURE);

    fault_p->px_fh_dip = dip;
    fault_p->px_fh_sysino = sysino;
    fault_p->px_err_func = px_err_cb_intr;
    fault_p->px_intr_ino = px_p->px_inos[PX_INTR_XBC];

    return (px_cb_add_intr(fault_p));
}

void
px_cb_detach(px_t *px_p)
{
    px_cb_rem_intr(&px_p->px_cb_fault);
}

/*
 * power management related initialization specific to px
 * called by px_attach()
 */
static int
px_pwr_setup(dev_info_t *dip)
{
    pcie_pwr_t *pwr_p;
    int instance = ddi_get_instance(dip);
    px_t *px_p = INST_TO_STATE(instance);
    ddi_intr_handle_impl_t hdl;

    ASSERT(PCIE_PMINFO(dip));
    pwr_p = PCIE_NEXUS_PMINFO(dip);
    ASSERT(pwr_p);

    /*
     * indicate support LDI (Layered Driver Interface)
     * Create the property, if it is not already there
     */
    if (!ddi_prop_exists(DDI_DEV_T_NONE, dip, DDI_PROP_DONTPASS,
        DDI_KERNEL_IOCTL)) {
        if (ddi_prop_create(DDI_DEV_T_NONE, dip, DDI_PROP_CANSLEEP,
            DDI_KERNEL_IOCTL, NULL, 0) != DDI_PROP_SUCCESS) {
            DBG(DBG_PWR, dip, "can't create kernel ioctl prop\n");
            return (DDI_FAILURE);
        }
    }
    /* No support for device PM. We are always at full power */
    pwr_p->pwr_func_lvl = PM_LEVEL_D0;

    mutex_init(&px_p->px_l23ready_lock, NULL, MUTEX_DRIVER,
        DDI_INTR_PRI(px_pwr_pil));
    cv_init(&px_p->px_l23ready_cv, NULL, CV_DRIVER, NULL);

    /* Initialize handle */
    bzero(&hdl, sizeof (ddi_intr_handle_impl_t));
    hdl.ih_cb_arg1 = px_p;
    hdl.ih_ver = DDI_INTR_VERSION;
    hdl.ih_state = DDI_IHDL_STATE_ALLOC;
    hdl.ih_dip = dip;
    hdl.ih_pri = px_pwr_pil;

    /* Add PME_TO_ACK message handler */
    hdl.ih_cb_func = (ddi_intr_handler_t *)px_pmeq_intr;
    if (px_add_msiq_intr(dip, dip, &hdl, MSG_REC,
        (msgcode_t)PCIE_PME_ACK_MSG, &px_p->px_pm_msiq_id) != DDI_SUCCESS) {
        DBG(DBG_PWR, dip, "px_pwr_setup: couldn't add "
            " PME_TO_ACK intr\n");
        goto pwr_setup_err1;
    }
    px_lib_msg_setmsiq(dip, PCIE_PME_ACK_MSG, px_p->px_pm_msiq_id);
    px_lib_msg_setvalid(dip, PCIE_PME_ACK_MSG, PCIE_MSG_VALID);

    if (px_ib_update_intr_state(px_p, px_p->px_dip, hdl.ih_inum,
        px_msiqid_to_devino(px_p, px_p->px_pm_msiq_id), px_pwr_pil,
        PX_INTR_STATE_ENABLE, MSG_REC, PCIE_PME_ACK_MSG) != DDI_SUCCESS) {
        DBG(DBG_PWR, dip, "px_pwr_setup: PME_TO_ACK update interrupt"
            " state failed\n");
        goto px_pwrsetup_err_state;
    }

    return (DDI_SUCCESS);

px_pwrsetup_err_state:
    px_lib_msg_setvalid(dip, PCIE_PME_ACK_MSG, PCIE_MSG_INVALID);
    (void) px_rem_msiq_intr(dip, dip, &hdl, MSG_REC, PCIE_PME_ACK_MSG,
        px_p->px_pm_msiq_id);
pwr_setup_err1:
    mutex_destroy(&px_p->px_l23ready_lock);
    cv_destroy(&px_p->px_l23ready_cv);

    return (DDI_FAILURE);
}

/*
 * undo whatever is done in px_pwr_setup. called by px_detach()
 */
static void
px_pwr_teardown(dev_info_t *dip)
{
    int instance = ddi_get_instance(dip);
    px_t *px_p = INST_TO_STATE(instance);
    ddi_intr_handle_impl_t  hdl;

    if (!PCIE_PMINFO(dip) || !PCIE_NEXUS_PMINFO(dip))
        return;

    /* Initialize handle */
    bzero(&hdl, sizeof (ddi_intr_handle_impl_t));
    hdl.ih_ver = DDI_INTR_VERSION;
    hdl.ih_state = DDI_IHDL_STATE_ALLOC;
    hdl.ih_dip = dip;
    hdl.ih_pri = px_pwr_pil;

    px_lib_msg_setvalid(dip, PCIE_PME_ACK_MSG, PCIE_MSG_INVALID);
    (void) px_rem_msiq_intr(dip, dip, &hdl, MSG_REC, PCIE_PME_ACK_MSG,
        px_p->px_pm_msiq_id);

    (void) px_ib_update_intr_state(px_p, px_p->px_dip, hdl.ih_inum,
        px_msiqid_to_devino(px_p, px_p->px_pm_msiq_id), px_pwr_pil,
        PX_INTR_STATE_DISABLE, MSG_REC, PCIE_PME_ACK_MSG);

    px_p->px_pm_msiq_id = (msiqid_t)-1;

    cv_destroy(&px_p->px_l23ready_cv);
    mutex_destroy(&px_p->px_l23ready_lock);
}

/* bus driver entry points */

/*
 * bus map entry point:
 *
 *  if map request is for an rnumber
 *      get the corresponding regspec from device node
 *  build a new regspec in our parent's format
 *  build a new map_req with the new regspec
 *  call up the tree to complete the mapping
 */
int
px_map(dev_info_t *dip, dev_info_t *rdip, ddi_map_req_t *mp,
    off_t off, off_t len, caddr_t *addrp)
{
    px_t *px_p = DIP_TO_STATE(dip);
    struct regspec p_regspec;
    ddi_map_req_t p_mapreq;
    int reglen, rval, r_no;
    pci_regspec_t reloc_reg, *rp = &reloc_reg;

    DBG(DBG_MAP, dip, "rdip=%s%d:",
        ddi_driver_name(rdip), ddi_get_instance(rdip));

    if (mp->map_flags & DDI_MF_USER_MAPPING)
        return (DDI_ME_UNIMPLEMENTED);

    switch (mp->map_type) {
    case DDI_MT_REGSPEC:
        reloc_reg = *(pci_regspec_t *)mp->map_obj.rp;   /* dup whole */
        break;

    case DDI_MT_RNUMBER:
        r_no = mp->map_obj.rnumber;
        DBG(DBG_MAP | DBG_CONT, dip, " r#=%x", r_no);

        if (ddi_getlongprop(DDI_DEV_T_ANY, rdip, DDI_PROP_DONTPASS,
            "reg", (caddr_t)&rp, &reglen) != DDI_SUCCESS)
                return (DDI_ME_RNUMBER_RANGE);

        if (r_no < 0 || r_no >= reglen / sizeof (pci_regspec_t)) {
            kmem_free(rp, reglen);
            return (DDI_ME_RNUMBER_RANGE);
        }
        rp += r_no;
        break;

    default:
        return (DDI_ME_INVAL);
    }
    DBG(DBG_MAP | DBG_CONT, dip, "\n");

    if ((rp->pci_phys_hi & PCI_REG_ADDR_M) == PCI_ADDR_CONFIG) {
        /*
         * There may be a need to differentiate between PCI
         * and PCI-Ex devices so the following range check is
         * done correctly, depending on the implementation of
         * px_pci bridge nexus driver.
         */
        if ((off >= PCIE_CONF_HDR_SIZE) ||
                (len > PCIE_CONF_HDR_SIZE) ||
                (off + len > PCIE_CONF_HDR_SIZE))
            return (DDI_ME_INVAL);
        /*
         * the following function returning a DDI_FAILURE assumes
         * that there are no virtual config space access services
         * defined in this layer. Otherwise it is availed right
         * here and we return.
         */
        rval = px_lib_map_vconfig(dip, mp, off, rp, addrp);
        if (rval == DDI_SUCCESS)
            goto done;
    }

    /*
     * No virtual config space services or we are mapping
     * a region of memory mapped config/IO/memory space, so proceed
     * to the parent.
     */

    /* relocate within 64-bit pci space through "assigned-addresses" */
    if (rval = px_reloc_reg(dip, rdip, px_p, rp))
        goto done;

    if (len)    /* adjust regspec according to mapping request */
        rp->pci_size_low = len; /* MIN ? */
    rp->pci_phys_low += off;

    /* translate relocated pci regspec into parent space through "ranges" */
    if (rval = px_xlate_reg(px_p, rp, &p_regspec))
        goto done;

    p_mapreq = *mp;     /* dup the whole structure */
    p_mapreq.map_type = DDI_MT_REGSPEC;
    p_mapreq.map_obj.rp = &p_regspec;
    px_lib_map_attr_check(&p_mapreq);
    rval = ddi_map(dip, &p_mapreq, 0, 0, addrp);

    if (rval == DDI_SUCCESS) {
        /*
         * Set-up access functions for FM access error capable drivers.
         */
        if (DDI_FM_ACC_ERR_CAP(ddi_fm_capable(rdip)) &&
            mp->map_handlep->ah_acc.devacc_attr_access !=
            DDI_DEFAULT_ACC)
            px_fm_acc_setup(mp, rdip);
    }

done:
    if (mp->map_type == DDI_MT_RNUMBER)
        kmem_free(rp - r_no, reglen);

    return (rval);
}

/*
 * bus dma map entry point
 * return value:
 *  DDI_DMA_PARTIAL_MAP  1
 *  DDI_DMA_MAPOK        0
 *  DDI_DMA_MAPPED       0
 *  DDI_DMA_NORESOURCES -1
 *  DDI_DMA_NOMAPPING   -2
 *  DDI_DMA_TOOBIG      -3
 */
int
px_dma_setup(dev_info_t *dip, dev_info_t *rdip, ddi_dma_req_t *dmareq,
    ddi_dma_handle_t *handlep)
{
    px_t *px_p = DIP_TO_STATE(dip);
    px_mmu_t *mmu_p = px_p->px_mmu_p;
    ddi_dma_impl_t *mp;
    int ret;

    DBG(DBG_DMA_MAP, dip, "mapping - rdip=%s%d type=%s\n",
        ddi_driver_name(rdip), ddi_get_instance(rdip),
        handlep ? "alloc" : "advisory");

    if (!(mp = px_dma_lmts2hdl(dip, rdip, mmu_p, dmareq)))
        return (DDI_DMA_NORESOURCES);
    if (mp == (ddi_dma_impl_t *)DDI_DMA_NOMAPPING)
        return (DDI_DMA_NOMAPPING);
    if (ret = px_dma_type(px_p, dmareq, mp))
        goto freehandle;
    if (ret = px_dma_pfn(px_p, dmareq, mp))
        goto freehandle;

    switch (PX_DMA_TYPE(mp)) {
    case PX_DMAI_FLAGS_DVMA:    /* LINTED E_EQUALITY_NOT_ASSIGNMENT */
        if ((ret = px_dvma_win(px_p, dmareq, mp)) || !handlep)
            goto freehandle;
        if (!PX_DMA_CANCACHE(mp)) { /* try fast track */
            if (PX_DMA_CANFAST(mp)) {
                if (!px_dvma_map_fast(mmu_p, mp))
                    break;
            /* LINTED E_NOP_ELSE_STMT */
            } else {
                PX_DVMA_FASTTRAK_PROF(mp);
            }
        }
        if (ret = px_dvma_map(mp, dmareq, mmu_p))
            goto freehandle;
        break;
    case PX_DMAI_FLAGS_PTP: /* LINTED E_EQUALITY_NOT_ASSIGNMENT */
        if ((ret = px_dma_physwin(px_p, dmareq, mp)) || !handlep)
            goto freehandle;
        break;
    case PX_DMAI_FLAGS_BYPASS:
    default:
        cmn_err(CE_PANIC, "%s%d: px_dma_setup: bad dma type 0x%x",
            ddi_driver_name(rdip), ddi_get_instance(rdip),
            PX_DMA_TYPE(mp));
        /*NOTREACHED*/
    }
    *handlep = (ddi_dma_handle_t)mp;
    mp->dmai_flags |= PX_DMAI_FLAGS_INUSE;
    px_dump_dma_handle(DBG_DMA_MAP, dip, mp);

    return ((mp->dmai_nwin == 1) ? DDI_DMA_MAPPED : DDI_DMA_PARTIAL_MAP);
freehandle:
    if (ret == DDI_DMA_NORESOURCES)
        px_dma_freemp(mp); /* don't run_callback() */
    else
        (void) px_dma_freehdl(dip, rdip, (ddi_dma_handle_t)mp);
    return (ret);
}


/*
 * bus dma alloc handle entry point:
 */
int
px_dma_allochdl(dev_info_t *dip, dev_info_t *rdip, ddi_dma_attr_t *attrp,
    int (*waitfp)(caddr_t), caddr_t arg, ddi_dma_handle_t *handlep)
{
    px_t *px_p = DIP_TO_STATE(dip);
    ddi_dma_impl_t *mp;
    int rval;

    DBG(DBG_DMA_ALLOCH, dip, "rdip=%s%d\n",
        ddi_driver_name(rdip), ddi_get_instance(rdip));

    if (attrp->dma_attr_version != DMA_ATTR_V0)
        return (DDI_DMA_BADATTR);

    if (!(mp = px_dma_allocmp(dip, rdip, waitfp, arg)))
        return (DDI_DMA_NORESOURCES);

    /*
     * Save requestor's information
     */
    mp->dmai_attr   = *attrp; /* whole object - augmented later  */
    *PX_DEV_ATTR(mp)    = *attrp; /* whole object - device orig attr */
    DBG(DBG_DMA_ALLOCH, dip, "mp=%p\n", mp);

    /* check and convert dma attributes to handle parameters */
    if (rval = px_dma_attr2hdl(px_p, mp)) {
        px_dma_freehdl(dip, rdip, (ddi_dma_handle_t)mp);
        *handlep = NULL;
        return (rval);
    }
    *handlep = (ddi_dma_handle_t)mp;
    return (DDI_SUCCESS);
}


/*
 * bus dma free handle entry point:
 */
/*ARGSUSED*/
int
px_dma_freehdl(dev_info_t *dip, dev_info_t *rdip, ddi_dma_handle_t handle)
{
    DBG(DBG_DMA_FREEH, dip, "rdip=%s%d mp=%p\n",
        ddi_driver_name(rdip), ddi_get_instance(rdip), handle);
    px_dma_freemp((ddi_dma_impl_t *)handle);

    if (px_kmem_clid) {
        DBG(DBG_DMA_FREEH, dip, "run handle callback\n");
        ddi_run_callback(&px_kmem_clid);
    }
    return (DDI_SUCCESS);
}


/*
 * bus dma bind handle entry point:
 */
int
px_dma_bindhdl(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle, ddi_dma_req_t *dmareq,
    ddi_dma_cookie_t *cookiep, uint_t *ccountp)
{
    px_t *px_p = DIP_TO_STATE(dip);
    px_mmu_t *mmu_p = px_p->px_mmu_p;
    ddi_dma_impl_t *mp = (ddi_dma_impl_t *)handle;
    int ret;

    DBG(DBG_DMA_BINDH, dip, "rdip=%s%d mp=%p dmareq=%p\n",
        ddi_driver_name(rdip), ddi_get_instance(rdip), mp, dmareq);

    if (mp->dmai_flags & PX_DMAI_FLAGS_INUSE)
        return (DDI_DMA_INUSE);

    ASSERT((mp->dmai_flags & ~PX_DMAI_FLAGS_PRESERVE) == 0);
    mp->dmai_flags |= PX_DMAI_FLAGS_INUSE;

    if (ret = px_dma_type(px_p, dmareq, mp))
        goto err;
    if (ret = px_dma_pfn(px_p, dmareq, mp))
        goto err;

    switch (PX_DMA_TYPE(mp)) {
    case PX_DMAI_FLAGS_DVMA:
        if (ret = px_dvma_win(px_p, dmareq, mp))
            goto map_err;
        if (!PX_DMA_CANCACHE(mp)) { /* try fast track */
            if (PX_DMA_CANFAST(mp)) {
                if (!px_dvma_map_fast(mmu_p, mp))
                    goto mapped; /*LINTED E_NOP_ELSE_STMT*/
            } else {
                PX_DVMA_FASTTRAK_PROF(mp);
            }
        }
        if (ret = px_dvma_map(mp, dmareq, mmu_p))
            goto map_err;
mapped:
        *ccountp = 1;
        MAKE_DMA_COOKIE(cookiep, mp->dmai_mapping, mp->dmai_size);
        break;
    case PX_DMAI_FLAGS_BYPASS:
    case PX_DMAI_FLAGS_PTP:
        if (ret = px_dma_physwin(px_p, dmareq, mp))
            goto map_err;
        *ccountp = PX_WINLST(mp)->win_ncookies;
        *cookiep =
            *(ddi_dma_cookie_t *)(PX_WINLST(mp) + 1); /* wholeobj */
        break;
    default:
        cmn_err(CE_PANIC, "%s%d: px_dma_bindhdl(%p): bad dma type",
            ddi_driver_name(rdip), ddi_get_instance(rdip), mp);
        /*NOTREACHED*/
    }
    DBG(DBG_DMA_BINDH, dip, "cookie %" PRIx64 "+%x\n",
        cookiep->dmac_address, cookiep->dmac_size);
    px_dump_dma_handle(DBG_DMA_MAP, dip, mp);

    /* insert dma handle into FMA cache */
    if (mp->dmai_attr.dma_attr_flags & DDI_DMA_FLAGERR) {
        (void) ndi_fmc_insert(rdip, DMA_HANDLE, mp, NULL);
        mp->dmai_error.err_cf = impl_dma_check;
    }

    return (mp->dmai_nwin == 1 ? DDI_DMA_MAPPED : DDI_DMA_PARTIAL_MAP);
map_err:
    px_dma_freepfn(mp);
err:
    mp->dmai_flags &= PX_DMAI_FLAGS_PRESERVE;
    return (ret);
}


/*
 * bus dma unbind handle entry point:
 */
/*ARGSUSED*/
int
px_dma_unbindhdl(dev_info_t *dip, dev_info_t *rdip, ddi_dma_handle_t handle)
{
    ddi_dma_impl_t *mp = (ddi_dma_impl_t *)handle;
    px_t *px_p = DIP_TO_STATE(dip);
    px_mmu_t *mmu_p = px_p->px_mmu_p;

    DBG(DBG_DMA_UNBINDH, dip, "rdip=%s%d, mp=%p\n",
        ddi_driver_name(rdip), ddi_get_instance(rdip), handle);
    if ((mp->dmai_flags & PX_DMAI_FLAGS_INUSE) == 0) {
        DBG(DBG_DMA_UNBINDH, dip, "handle not inuse\n");
        return (DDI_FAILURE);
    }

    /* remove dma handle from FMA cache */
    if (mp->dmai_attr.dma_attr_flags & DDI_DMA_FLAGERR) {
        if (DEVI(rdip)->devi_fmhdl != NULL &&
            DDI_FM_DMA_ERR_CAP(DEVI(rdip)->devi_fmhdl->fh_cap)) {
            (void) ndi_fmc_remove(rdip, DMA_HANDLE, mp);
        }
    }

    /*
     * Here if the handle is using the iommu.  Unload all the iommu
     * translations.
     */
    switch (PX_DMA_TYPE(mp)) {
    case PX_DMAI_FLAGS_DVMA:
        px_mmu_unmap_window(mmu_p, mp);
        px_dvma_unmap(mmu_p, mp);
        px_dma_freepfn(mp);
        break;
    case PX_DMAI_FLAGS_BYPASS:
    case PX_DMAI_FLAGS_PTP:
        px_dma_freewin(mp);
        break;
    default:
        cmn_err(CE_PANIC, "%s%d: px_dma_unbindhdl:bad dma type %p",
            ddi_driver_name(rdip), ddi_get_instance(rdip), mp);
        /*NOTREACHED*/
    }
    if (mmu_p->mmu_dvma_clid != 0) {
        DBG(DBG_DMA_UNBINDH, dip, "run dvma callback\n");
        ddi_run_callback(&mmu_p->mmu_dvma_clid);
    }
    if (px_kmem_clid) {
        DBG(DBG_DMA_UNBINDH, dip, "run handle callback\n");
        ddi_run_callback(&px_kmem_clid);
    }
    mp->dmai_flags &= PX_DMAI_FLAGS_PRESERVE;

    return (DDI_SUCCESS);
}

/*
 * bus dma win entry point:
 */
int
px_dma_win(dev_info_t *dip, dev_info_t *rdip,
    ddi_dma_handle_t handle, uint_t win, off_t *offp,
    size_t *lenp, ddi_dma_cookie_t *cookiep, uint_t *ccountp)
{
    ddi_dma_impl_t  *mp = (ddi_dma_impl_t *)handle;
    int     ret;

    DBG(DBG_DMA_WIN, dip, "rdip=%s%d\n",
        ddi_driver_name(rdip), ddi_get_instance(rdip));

    px_dump_dma_handle(DBG_DMA_WIN, dip, mp);
    if (win >= mp->dmai_nwin) {
        DBG(DBG_DMA_WIN, dip, "%x out of range\n", win);
        return (DDI_FAILURE);
    }

    switch (PX_DMA_TYPE(mp)) {
    case PX_DMAI_FLAGS_DVMA:
        if (win != PX_DMA_CURWIN(mp)) {
            px_t *px_p = DIP_TO_STATE(dip);
            px_mmu_t *mmu_p = px_p->px_mmu_p;
            px_mmu_unmap_window(mmu_p, mp);

            /* map_window sets dmai_mapping/size/offset */
            px_mmu_map_window(mmu_p, mp, win);
            if ((ret = px_mmu_map_window(mmu_p,
                mp, win)) != DDI_SUCCESS)
                return (ret);
        }
        if (cookiep)
            MAKE_DMA_COOKIE(cookiep, mp->dmai_mapping,
                mp->dmai_size);
        if (ccountp)
            *ccountp = 1;
        break;
    case PX_DMAI_FLAGS_PTP:
    case PX_DMAI_FLAGS_BYPASS: {
        int i;
        ddi_dma_cookie_t *ck_p;
        px_dma_win_t *win_p = mp->dmai_winlst;

        for (i = 0; i < win; win_p = win_p->win_next, i++);
        ck_p = (ddi_dma_cookie_t *)(win_p + 1);
        *cookiep = *ck_p;
        mp->dmai_offset = win_p->win_offset;
        mp->dmai_size   = win_p->win_size;
        mp->dmai_mapping = ck_p->dmac_laddress;
        mp->dmai_cookie = ck_p + 1;
        win_p->win_curseg = 0;
        if (ccountp)
            *ccountp = win_p->win_ncookies;
        }
        break;
    default:
        cmn_err(CE_WARN, "%s%d: px_dma_win:bad dma type 0x%x",
            ddi_driver_name(rdip), ddi_get_instance(rdip),
            PX_DMA_TYPE(mp));
        return (DDI_FAILURE);
    }
    if (cookiep)
        DBG(DBG_DMA_WIN, dip,
            "cookie - dmac_address=%x dmac_size=%x\n",
            cookiep->dmac_address, cookiep->dmac_size);
    if (offp)
        *offp = (off_t)mp->dmai_offset;
    if (lenp)
        *lenp = mp->dmai_size;
    return (DDI_SUCCESS);
}

#ifdef  DEBUG
static char *px_dmactl_str[] = {
    "DDI_DMA_FREE",
    "DDI_DMA_SYNC",
    "DDI_DMA_HTOC",
    "DDI_DMA_KVADDR",
    "DDI_DMA_MOVWIN",
    "DDI_DMA_REPWIN",
    "DDI_DMA_GETERR",
    "DDI_DMA_COFF",
    "DDI_DMA_NEXTWIN",
    "DDI_DMA_NEXTSEG",
    "DDI_DMA_SEGTOC",
    "DDI_DMA_RESERVE",
    "DDI_DMA_RELEASE",
    "DDI_DMA_RESETH",
    "DDI_DMA_CKSYNC",
    "DDI_DMA_IOPB_ALLOC",
    "DDI_DMA_IOPB_FREE",
    "DDI_DMA_SMEM_ALLOC",
    "DDI_DMA_SMEM_FREE",
    "DDI_DMA_SET_SBUS64"
};
#endif  /* DEBUG */

/*
 * bus dma control entry point:
 */
/*ARGSUSED*/
int
px_dma_ctlops(dev_info_t *dip, dev_info_t *rdip, ddi_dma_handle_t handle,
    enum ddi_dma_ctlops cmd, off_t *offp, size_t *lenp, caddr_t *objp,
    uint_t cache_flags)
{
    ddi_dma_impl_t *mp = (ddi_dma_impl_t *)handle;

#ifdef  DEBUG
    DBG(DBG_DMA_CTL, dip, "%s: rdip=%s%d\n", px_dmactl_str[cmd],
        ddi_driver_name(rdip), ddi_get_instance(rdip));
#endif  /* DEBUG */

    switch (cmd) {
    case DDI_DMA_FREE:
        (void) px_dma_unbindhdl(dip, rdip, handle);
        (void) px_dma_freehdl(dip, rdip, handle);
        return (DDI_SUCCESS);
    case DDI_DMA_RESERVE: {
        px_t *px_p = DIP_TO_STATE(dip);
        return (px_fdvma_reserve(dip, rdip, px_p,
            (ddi_dma_req_t *)offp, (ddi_dma_handle_t *)objp));
        }
    case DDI_DMA_RELEASE: {
        px_t *px_p = DIP_TO_STATE(dip);
        return (px_fdvma_release(dip, px_p, mp));
        }
    default:
        break;
    }

    switch (PX_DMA_TYPE(mp)) {
    case PX_DMAI_FLAGS_DVMA:
        return (px_dvma_ctl(dip, rdip, mp, cmd, offp, lenp, objp,
            cache_flags));
    case PX_DMAI_FLAGS_PTP:
    case PX_DMAI_FLAGS_BYPASS:
        return (px_dma_ctl(dip, rdip, mp, cmd, offp, lenp, objp,
            cache_flags));
    default:
        cmn_err(CE_PANIC, "%s%d: px_dma_ctlops(%x):bad dma type %x",
            ddi_driver_name(rdip), ddi_get_instance(rdip), cmd,
            mp->dmai_flags);
        /*NOTREACHED*/
    }
    return (0);
}

/*
 * control ops entry point:
 *
 * Requests handled completely:
 *  DDI_CTLOPS_INITCHILD    see init_child() for details
 *  DDI_CTLOPS_UNINITCHILD
 *  DDI_CTLOPS_REPORTDEV    see report_dev() for details
 *  DDI_CTLOPS_IOMIN    cache line size if streaming otherwise 1
 *  DDI_CTLOPS_REGSIZE
 *  DDI_CTLOPS_NREGS
 *  DDI_CTLOPS_DVMAPAGESIZE
 *  DDI_CTLOPS_POKE
 *  DDI_CTLOPS_PEEK
 *
 * All others passed to parent.
 */
int
px_ctlops(dev_info_t *dip, dev_info_t *rdip,
    ddi_ctl_enum_t op, void *arg, void *result)
{
    px_t *px_p = DIP_TO_STATE(dip);
    struct detachspec *ds;
    struct attachspec *as;

    switch (op) {
    case DDI_CTLOPS_INITCHILD:
        return (px_init_child(px_p, (dev_info_t *)arg));

    case DDI_CTLOPS_UNINITCHILD:
        return (px_uninit_child(px_p, (dev_info_t *)arg));

    case DDI_CTLOPS_ATTACH:
        if (!pcie_is_child(dip, rdip))
            return (DDI_SUCCESS);

        as = (struct attachspec *)arg;
        switch (as->when) {
        case DDI_PRE:
            if (as->cmd == DDI_ATTACH) {
                DBG(DBG_PWR, dip, "PRE_ATTACH for %s@%d\n",
                    ddi_driver_name(rdip),
                    ddi_get_instance(rdip));
                return (pcie_pm_hold(dip));
            }
            if (as->cmd == DDI_RESUME) {
                ddi_acc_handle_t    config_handle;
                DBG(DBG_PWR, dip, "PRE_RESUME for %s@%d\n",
                    ddi_driver_name(rdip),
                    ddi_get_instance(rdip));

                if (pci_config_setup(rdip, &config_handle) ==
                    DDI_SUCCESS) {
                    pcie_clear_errors(rdip, config_handle);
                    pci_config_teardown(&config_handle);
                }
            }
            return (DDI_SUCCESS);

        case DDI_POST:
            DBG(DBG_PWR, dip, "POST_ATTACH for %s@%d\n",
                ddi_driver_name(rdip), ddi_get_instance(rdip));
            if (as->cmd == DDI_ATTACH && as->result != DDI_SUCCESS)
                pcie_pm_release(dip);

            pf_init(rdip, (void *)px_p->px_fm_ibc);

            (void) pcie_postattach_child(rdip);

            return (DDI_SUCCESS);
        default:
            break;
        }
        break;

    case DDI_CTLOPS_DETACH:
        ds = (struct detachspec *)arg;
        switch (ds->when) {
        case DDI_POST:
            if (ds->cmd == DDI_DETACH &&
                ds->result == DDI_SUCCESS) {
                DBG(DBG_PWR, dip, "POST_DETACH for %s@%d\n",
                    ddi_driver_name(rdip),
                    ddi_get_instance(rdip));
                return (pcie_pm_remove_child(dip, rdip));
            }
            return (DDI_SUCCESS);
        case DDI_PRE:
            pf_fini(rdip);
            return (DDI_SUCCESS);
        default:
            break;
        }
        break;

    case DDI_CTLOPS_REPORTDEV:
        return (px_report_dev(rdip));

    case DDI_CTLOPS_IOMIN:
        return (DDI_SUCCESS);

    case DDI_CTLOPS_REGSIZE:
        *((off_t *)result) = px_get_reg_set_size(rdip, *((int *)arg));
        return (*((off_t *)result) == 0 ? DDI_FAILURE : DDI_SUCCESS);

    case DDI_CTLOPS_NREGS:
        *((uint_t *)result) = px_get_nreg_set(rdip);
        return (DDI_SUCCESS);

    case DDI_CTLOPS_DVMAPAGESIZE:
        *((ulong_t *)result) = MMU_PAGE_SIZE;
        return (DDI_SUCCESS);

    case DDI_CTLOPS_POKE:   /* platform dependent implementation. */
        return (px_lib_ctlops_poke(dip, rdip,
            (peekpoke_ctlops_t *)arg));

    case DDI_CTLOPS_PEEK:   /* platform dependent implementation. */
        return (px_lib_ctlops_peek(dip, rdip,
            (peekpoke_ctlops_t *)arg, result));

    case DDI_CTLOPS_POWER:
    default:
        break;
    }

    /*
     * Now pass the request up to our parent.
     */
    DBG(DBG_CTLOPS, dip, "passing request to parent: rdip=%s%d\n",
        ddi_driver_name(rdip), ddi_get_instance(rdip));
    return (ddi_ctlops(dip, rdip, op, arg, result));
}

/* ARGSUSED */
int
px_intr_ops(dev_info_t *dip, dev_info_t *rdip, ddi_intr_op_t intr_op,
    ddi_intr_handle_impl_t *hdlp, void *result)
{
    int intr_types, ret = DDI_SUCCESS;

    DBG(DBG_INTROPS, dip, "px_intr_ops: rdip=%s%d\n",
        ddi_driver_name(rdip), ddi_get_instance(rdip));

    /* Process DDI_INTROP_SUPPORTED_TYPES request here */
    if (intr_op == DDI_INTROP_SUPPORTED_TYPES) {
        *(int *)result = i_ddi_get_intx_nintrs(rdip) ?
            DDI_INTR_TYPE_FIXED : 0;

        if ((pci_msi_get_supported_type(rdip,
            &intr_types)) == DDI_SUCCESS) {
            /*
             * Double check supported interrupt types vs.
             * what the host bridge supports.
             */
            *(int *)result |= intr_types;
        }

        return (ret);
    }

    /*
     * PCI-E nexus driver supports fixed, MSI and MSI-X interrupts.
     * Return failure if interrupt type is not supported.
     */
    switch (hdlp->ih_type) {
    case DDI_INTR_TYPE_FIXED:
        ret = px_intx_ops(dip, rdip, intr_op, hdlp, result);
        break;
    case DDI_INTR_TYPE_MSI:
    case DDI_INTR_TYPE_MSIX:
        ret = px_msix_ops(dip, rdip, intr_op, hdlp, result);
        break;
    default:
        ret = DDI_ENOTSUP;
        break;
    }

    return (ret);
}

static int
px_init_hotplug(px_t *px_p)
{
    px_bus_range_t bus_range;
    dev_info_t *dip;
    pciehpc_regops_t regops;

    dip = px_p->px_dip;

    if (ddi_prop_exists(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS,
        "hotplug-capable") == 0)
        return (DDI_FAILURE);

    /*
     * Before initializing hotplug - open up bus range.  The busra
     * module will initialize its pool of bus numbers from this.
     * "busra" will be the agent that keeps track of them during
     * hotplug.  Also, note, that busra will remove any bus numbers
     * already in use from boot time.
     */
    if (ddi_prop_exists(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS,
        "bus-range") == 0) {
        cmn_err(CE_WARN, "%s%d: bus-range not found\n",
            ddi_driver_name(dip), ddi_get_instance(dip));
#ifdef  DEBUG
        bus_range.lo = 0x0;
        bus_range.hi = 0xff;

        if (ndi_prop_update_int_array(DDI_DEV_T_NONE,
            dip, "bus-range", (int *)&bus_range, 2)
            != DDI_PROP_SUCCESS) {
            return (DDI_FAILURE);
        }
#else
        return (DDI_FAILURE);
#endif
    }

    if (px_lib_hotplug_init(dip, (void *)&regops) != DDI_SUCCESS)
        return (DDI_FAILURE);

    if (pciehpc_init(dip, &regops) != DDI_SUCCESS) {
        px_lib_hotplug_uninit(dip);
        return (DDI_FAILURE);
    }

    if (pcihp_init(dip) != DDI_SUCCESS) {
        (void) pciehpc_uninit(dip);
        px_lib_hotplug_uninit(dip);
        return (DDI_FAILURE);
    }

    if (pcihp_get_cb_ops() != NULL) {
        DBG(DBG_ATTACH, dip, "%s%d hotplug enabled",
            ddi_driver_name(dip), ddi_get_instance(dip));
        px_p->px_dev_caps |= PX_HOTPLUG_CAPABLE;
    }

    return (DDI_SUCCESS);
}

static int
px_uninit_hotplug(dev_info_t *dip)
{
    if (pcihp_uninit(dip) != DDI_SUCCESS)
        return (DDI_FAILURE);

    if (pciehpc_uninit(dip) != DDI_SUCCESS)
        return (DDI_FAILURE);

    px_lib_hotplug_uninit(dip);

    return (DDI_SUCCESS);
}