io/pci/pci_devctl.c

	pci_devctl.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

/*
 * PCI nexus HotPlug devctl interface
 */
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/kmem.h>
#include <sys/async.h>
#include <sys/sysmacros.h>
#include <sys/sunddi.h>
#include <sys/sunndi.h>
#include <sys/ddi_impldefs.h>
#include <sys/pci/pci_obj.h>
#include <sys/pci_tools.h>
#include <sys/pci_tools_var.h>
#include <sys/open.h>
#include <sys/errno.h>
#include <sys/file.h>
#include <sys/policy.h>
#include <sys/hotplug/pci/pcihp.h>

/*LINTLIBRARY*/

static int pci_open(dev_t *devp, int flags, int otyp, cred_t *credp);
static int pci_close(dev_t dev, int flags, int otyp, cred_t *credp);
static int pci_ioctl(dev_t dev, int cmd, intptr_t arg, int mode,
                        cred_t *credp, int *rvalp);
static int pci_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op,
    int flags, char *name, caddr_t valuep, int *lengthp);

struct cb_ops pci_cb_ops = {
    pci_open,           /* open */
    pci_close,          /* close */
    nodev,              /* strategy */
    nodev,              /* print */
    nodev,              /* dump */
    nodev,              /* read */
    nodev,              /* write */
    pci_ioctl,          /* ioctl */
    nodev,              /* devmap */
    nodev,              /* mmap */
    nodev,              /* segmap */
    nochpoll,           /* poll */
    pci_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)() */
};

/* ARGSUSED3 */
static int
pci_open(dev_t *devp, int flags, int otyp, cred_t *credp)
{
    pci_t *pci_p;

    /*
     * Make sure the open is for the right file type.
     */
    if (otyp != OTYP_CHR)
        return (EINVAL);

    /*
     * Get the soft state structure for the device.
     */
    pci_p = DEV_TO_SOFTSTATE(*devp);
    if (pci_p == NULL)
        return (ENXIO);

    /*
     * Handle the open by tracking the device state.
     */
    DEBUG2(DBG_OPEN, pci_p->pci_dip, "devp=%x: flags=%x\n", devp, flags);
    mutex_enter(&pci_p->pci_mutex);
    if (flags & FEXCL) {
        if (pci_p->pci_soft_state != PCI_SOFT_STATE_CLOSED) {
            mutex_exit(&pci_p->pci_mutex);
            DEBUG0(DBG_OPEN, pci_p->pci_dip, "busy\n");
            return (EBUSY);
        }
        pci_p->pci_soft_state = PCI_SOFT_STATE_OPEN_EXCL;
    } else {
        if (pci_p->pci_soft_state == PCI_SOFT_STATE_OPEN_EXCL) {
            mutex_exit(&pci_p->pci_mutex);
            DEBUG0(DBG_OPEN, pci_p->pci_dip, "busy\n");
            return (EBUSY);
        }
        pci_p->pci_soft_state = PCI_SOFT_STATE_OPEN;
    }
    pci_p->pci_open_count++;
    mutex_exit(&pci_p->pci_mutex);
    return (0);
}


/* ARGSUSED */
static int
pci_close(dev_t dev, int flags, int otyp, cred_t *credp)
{
    pci_t *pci_p;

    if (otyp != OTYP_CHR)
        return (EINVAL);

    pci_p = DEV_TO_SOFTSTATE(dev);
    if (pci_p == NULL)
        return (ENXIO);

    DEBUG2(DBG_CLOSE, pci_p->pci_dip, "dev=%x: flags=%x\n", dev, flags);
    mutex_enter(&pci_p->pci_mutex);
    pci_p->pci_soft_state = PCI_SOFT_STATE_CLOSED;
    pci_p->pci_open_count = 0;
    mutex_exit(&pci_p->pci_mutex);
    return (0);
}

/* ARGSUSED */
static int
pci_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, int *rvalp)
{
    pci_t *pci_p;
    dev_info_t *dip;
    struct devctl_iocdata *dcp;
    uint_t bus_state;
    int rv = 0;

    pci_p = DEV_TO_SOFTSTATE(dev);
    if (pci_p == NULL)
        return (ENXIO);

    dip = pci_p->pci_dip;
    DEBUG2(DBG_IOCTL, dip, "dev=%x: cmd=%x\n", dev, cmd);
#ifdef PCI_DMA_TEST
    if (IS_DMATEST(cmd)) {
        *rvalp = pci_dma_test(cmd, dip, pci_p, arg);
        return (0);
    }
#endif

    /*
     * PCI tools.
     */

    if ((cmd & ~IOCPARM_MASK) == PCITOOL_IOC) {
        switch (cmd) {
        case PCITOOL_DEVICE_SET_REG:
        case PCITOOL_DEVICE_GET_REG:

            /* Require full privileges. */
            if (secpolicy_kmdb(credp))
                rv = EPERM;
            else
                rv = pcitool_dev_reg_ops(
                    dev, (void *)arg, cmd, mode);
            break;

        case PCITOOL_NEXUS_SET_REG:
        case PCITOOL_NEXUS_GET_REG:

            /* Require full privileges. */
            if (secpolicy_kmdb(credp))
                rv = EPERM;
            else
                rv = pcitool_bus_reg_ops(
                    dev, (void *)arg, cmd, mode);
            break;

        case PCITOOL_DEVICE_SET_INTR:

            /* Require PRIV_SYS_RES_CONFIG, same as psradm */
            if (secpolicy_ponline(credp)) {
                rv = EPERM;
                break;
            }

        /*FALLTHRU*/
        /* These require no special privileges. */
        case PCITOOL_DEVICE_GET_INTR:
        case PCITOOL_DEVICE_NUM_INTR:
            rv = pcitool_intr_admn(dev, (void *)arg, cmd, mode);
            break;

        default:
            rv = ENOTTY;
            break;
        }

        return (rv);
    }

    /*
     * We can use the generic implementation for these ioctls
     */
    switch (cmd) {
    case DEVCTL_DEVICE_GETSTATE:
    case DEVCTL_DEVICE_ONLINE:
    case DEVCTL_DEVICE_OFFLINE:
    case DEVCTL_BUS_GETSTATE:
        return (ndi_devctl_ioctl(dip, cmd, arg, mode, 0));
    }

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

    switch (cmd) {

    case DEVCTL_DEVICE_RESET:
        DEBUG0(DBG_IOCTL, dip, "DEVCTL_DEVICE_RESET\n");
        rv = ENOTSUP;
        break;


    case DEVCTL_BUS_QUIESCE:
        DEBUG0(DBG_IOCTL, dip, "DEVCTL_BUS_QUIESCE\n");
        if (ndi_get_bus_state(dip, &bus_state) == NDI_SUCCESS)
            if (bus_state == BUS_QUIESCED)
                break;
        (void) ndi_set_bus_state(dip, BUS_QUIESCED);
        break;

    case DEVCTL_BUS_UNQUIESCE:
        DEBUG0(DBG_IOCTL, dip, "DEVCTL_BUS_UNQUIESCE\n");
        if (ndi_get_bus_state(dip, &bus_state) == NDI_SUCCESS)
            if (bus_state == BUS_ACTIVE)
                break;
        (void) ndi_set_bus_state(dip, BUS_ACTIVE);
        break;

    case DEVCTL_BUS_RESET:
        DEBUG0(DBG_IOCTL, dip, "DEVCTL_BUS_RESET\n");
        rv = ENOTSUP;
        break;

    case DEVCTL_BUS_RESETALL:
        DEBUG0(DBG_IOCTL, dip, "DEVCTL_BUS_RESETALL\n");
        rv = ENOTSUP;
        break;

    default:
        rv = ENOTTY;
    }

    ndi_dc_freehdl(dcp);
    return (rv);
}

static int pci_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op,
    int flags, char *name, caddr_t valuep, int *lengthp)
{
    if (ddi_prop_exists(DDI_DEV_T_ANY, dip, DDI_PROP_DONTPASS,
        "hotplug-capable"))
        return ((pcihp_get_cb_ops())->cb_prop_op(dev, dip,
            prop_op, flags, name, valuep, lengthp));

    return (ddi_prop_op(dev, dip, prop_op, flags, name, valuep, lengthp));
}