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/*
* 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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* A simple wrapper around the balloon kernel thread to allow userland
* programs access to the balloon status.
*/
#include <sys/types.h>
#include <sys/file.h>
#include <sys/errno.h>
#include <sys/open.h>
#include <sys/cred.h>
#include <sys/conf.h>
#include <sys/stat.h>
#include <sys/modctl.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/hypervisor.h>
#include <sys/sysmacros.h>
#include <sys/balloon_impl.h>
static dev_info_t *balloon_devi;
/*ARGSUSED*/
static int
balloon_getinfo(dev_info_t *devi, ddi_info_cmd_t cmd, void *arg, void **result)
{
if (getminor((dev_t)arg) != BALLOON_MINOR)
return (DDI_FAILURE);
switch (cmd) {
case DDI_INFO_DEVT2DEVINFO:
*result = balloon_devi;
break;
case DDI_INFO_DEVT2INSTANCE:
*result = 0;
break;
default:
return (DDI_FAILURE);
}
return (DDI_SUCCESS);
}
static int
balloon_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
{
if (cmd != DDI_ATTACH)
return (DDI_FAILURE);
if (ddi_create_minor_node(devi, ddi_get_name(devi), S_IFCHR,
ddi_get_instance(devi), DDI_PSEUDO, 0) != DDI_SUCCESS)
return (DDI_FAILURE);
balloon_devi = devi;
ddi_report_dev(devi);
return (DDI_SUCCESS);
}
static int
balloon_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
{
if (cmd != DDI_DETACH)
return (DDI_FAILURE);
ddi_remove_minor_node(devi, NULL);
balloon_devi = NULL;
return (DDI_SUCCESS);
}
/*ARGSUSED1*/
static int
balloon_open(dev_t *dev, int flag, int otyp, cred_t *cr)
{
return (getminor(*dev) == BALLOON_MINOR ? 0 : ENXIO);
}
/*
* When asked for one of the balloon values, we simply query the balloon thread.
*/
/*ARGSUSED*/
static int
balloon_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *cr,
int *rval_p)
{
int rval = 0;
size_t value;
switch (cmd) {
case BLN_IOCTL_CURRENT:
case BLN_IOCTL_TARGET:
case BLN_IOCTL_LOW:
case BLN_IOCTL_HIGH:
case BLN_IOCTL_LIMIT:
value = balloon_values(cmd);
if (ddi_copyout((void *)&value, (void *)arg, sizeof (value),
mode))
return (EFAULT);
break;
default:
rval = EINVAL;
break;
}
return (rval);
}
static struct cb_ops balloon_cb_ops = {
balloon_open,
nulldev, /* close */
nodev, /* strategy */
nodev, /* print */
nodev, /* dump */
nodev, /* read */
nodev, /* write */
balloon_ioctl, /* ioctl */
nodev, /* devmap */
nodev, /* mmap */
nodev, /* segmap */
nochpoll, /* poll */
ddi_prop_op,
NULL,
D_64BIT | D_MP,
CB_REV,
NULL,
NULL
};
static struct dev_ops balloon_dv_ops = {
DEVO_REV,
0,
balloon_getinfo,
nulldev, /* identify */
nulldev, /* probe */
balloon_attach,
balloon_detach,
nodev, /* reset */
&balloon_cb_ops,
NULL, /* struct bus_ops */
NULL, /* power */
ddi_quiesce_not_needed, /* quiesce */
};
static struct modldrv modldrv = {
&mod_driverops,
"balloon driver",
&balloon_dv_ops
};
static struct modlinkage modl = {
MODREV_1,
{
(void *)&modldrv,
NULL /* null termination */
}
};
int
_init(void)
{
return (mod_install(&modl));
}
int
_fini(void)
{
return (mod_remove(&modl));
}
int
_info(struct modinfo *modinfo)
{
return (mod_info(&modl, modinfo));
}
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