io/px/px_devctl.c

	px_devctl.c revision d4bc0535efa2c2219e9f83246a5f371dc7f94273
/*
 * 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.
 */

/*
 * 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/open.h>
#include <sys/errno.h>
#include <sys/file.h>
#include <sys/policy.h>
#include <sys/hotplug/pci/pcihp.h>
#include "px_obj.h"
#include <sys/pci_tools.h>
#include "px_tools_ext.h"
#include <sys/pcie_pwr.h>

/*LINTLIBRARY*/

static int px_open(dev_t *devp, int flags, int otyp, cred_t *credp);
static int px_close(dev_t dev, int flags, int otyp, cred_t *credp);
static int px_ioctl(dev_t dev, int cmd, intptr_t arg, int mode,
                        cred_t *credp, int *rvalp);
static int px_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 px_cb_ops = {
    px_open,            /* open */
    px_close,           /* close */
    nodev,              /* strategy */
    nodev,              /* print */
    nodev,              /* dump */
    nodev,              /* read */
    nodev,              /* write */
    px_ioctl,           /* ioctl */
    nodev,              /* devmap */
    nodev,              /* mmap */
    nodev,              /* segmap */
    nochpoll,           /* poll */
    px_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
px_open(dev_t *devp, int flags, int otyp, cred_t *credp)
{
    px_t *px_p;
    int rval;
    uint_t orig_px_soft_state;

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

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

    /*
     * Handle the open by tracking the device state.
     */
    DBG(DBG_OPEN, px_p->px_dip, "devp=%x: flags=%x\n", devp, flags);
    mutex_enter(&px_p->px_mutex);
    orig_px_soft_state = px_p->px_soft_state;
    if (flags & FEXCL) {
        if (px_p->px_soft_state != PX_SOFT_STATE_CLOSED) {
            mutex_exit(&px_p->px_mutex);
            DBG(DBG_OPEN, px_p->px_dip, "busy\n");
            return (EBUSY);
        }
        px_p->px_soft_state = PX_SOFT_STATE_OPEN_EXCL;
    } else {
        if (px_p->px_soft_state == PX_SOFT_STATE_OPEN_EXCL) {
            mutex_exit(&px_p->px_mutex);
            DBG(DBG_OPEN, px_p->px_dip, "busy\n");
            return (EBUSY);
        }
        px_p->px_soft_state = PX_SOFT_STATE_OPEN;
    }

    if (px_p->px_dev_caps & PX_HOTPLUG_CAPABLE)
        if (rval = (pcihp_get_cb_ops())->cb_open(devp, flags,
            otyp, credp)) {
            px_p->px_soft_state = orig_px_soft_state;
            mutex_exit(&px_p->px_mutex);
            return (rval);
        }

    px_p->px_open_count++;
    mutex_exit(&px_p->px_mutex);
    return (0);
}


/* ARGSUSED */
static int
px_close(dev_t dev, int flags, int otyp, cred_t *credp)
{
    px_t *px_p;
    int rval;

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

    px_p = PX_DEV_TO_SOFTSTATE(dev);
    if (px_p == NULL)
        return (ENXIO);

    DBG(DBG_CLOSE, px_p->px_dip, "dev=%x: flags=%x\n", dev, flags);
    mutex_enter(&px_p->px_mutex);

    if (px_p->px_dev_caps & PX_HOTPLUG_CAPABLE)
        if (rval = (pcihp_get_cb_ops())->cb_close(dev, flags,
            otyp, credp)) {
            mutex_exit(&px_p->px_mutex);
            return (rval);
        }

    px_p->px_soft_state = PX_SOFT_STATE_CLOSED;
    px_p->px_open_count = 0;
    mutex_exit(&px_p->px_mutex);
    return (0);
}

/* ARGSUSED */
static int
px_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, int *rvalp)
{
    px_t *px_p;
    dev_info_t *dip;
    struct devctl_iocdata *dcp;
    uint_t bus_state;
    int rv = DDI_SUCCESS;
    int minor = getminor(dev);

    px_p = PX_DEV_TO_SOFTSTATE(dev);
    if (px_p == NULL)
        return (ENXIO);

    dip = px_p->px_dip;
    DBG(DBG_IOCTL, dip, "dev=%x: cmd=%x\n", dev, cmd);

#ifdef  PX_DMA_TEST
    if (IS_DMATEST(cmd)) {
        *rvalp = px_dma_test(cmd, dip, px_p, arg);
        return (0);
    }
#endif  /* PX_DMA_TEST */

    switch (PCIHP_AP_MINOR_NUM_TO_PCI_DEVNUM(minor)) {

    /*
     * PCI tools.
     */
    case PCI_TOOL_REG_MINOR_NUM:

        switch (cmd) {
        case PCITOOL_DEVICE_SET_REG:
        case PCITOOL_DEVICE_GET_REG:

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

        default:
            rv = ENOTTY;
        }
        return (rv);

    case PCI_TOOL_INTR_MINOR_NUM:

        switch (cmd) {
        case PCITOOL_DEVICE_SET_INTR:

            /* Require full privileges. */
            if (secpolicy_kmdb(credp)) {
                rv = EPERM;
                break;
            }

        /*FALLTHRU*/
        /* These require no special privileges. */
        case PCITOOL_DEVICE_GET_INTR:
        case PCITOOL_SYSTEM_INTR_INFO:
            rv = pxtool_intr(dip, (void *)arg, cmd, mode);
            break;

        default:
            rv = ENOTTY;
        }
        return (rv);

    default:
        if (px_p->px_dev_caps & PX_HOTPLUG_CAPABLE)
            return ((pcihp_get_cb_ops())->cb_ioctl(dev, cmd,
                arg, mode, credp, rvalp));
        break;
    }

    if ((cmd & ~PPMREQ_MASK) == PPMREQ) {

        /* Need privileges to use these ioctls. */
        if (drv_priv(credp)) {
            DBG(DBG_TOOLS, dip,
                "px_tools: Insufficient privileges\n");

            return (EPERM);
        }
        return (px_lib_pmctl(cmd, px_p));
    }

    /*
     * 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:
        DBG(DBG_IOCTL, dip, "DEVCTL_DEVICE_RESET\n");
        rv = ENOTSUP;
        break;


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

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

    default:
        rv = ENOTTY;
    }

    ndi_dc_freehdl(dcp);
    return (rv);
}

static int px_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));
}