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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 (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
* Delphix (c) 2012 by Delphix. All rights reserved.
*/
/*
* Dump driver. Provides ioctls to get/set crash dump configuration.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/uio.h>
#include <sys/cred.h>
#include <sys/kmem.h>
#include <sys/errno.h>
#include <sys/modctl.h>
#include <sys/dumphdr.h>
#include <sys/dumpadm.h>
#include <sys/pathname.h>
#include <sys/file.h>
#include <vm/anon.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
static dev_info_t *dump_devi;
static int
dump_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
{
if (cmd != DDI_ATTACH)
return (DDI_FAILURE);
if (ddi_create_minor_node(devi, "dump", S_IFCHR, 0, DDI_PSEUDO, 0) ==
DDI_FAILURE) {
ddi_remove_minor_node(devi, NULL);
return (DDI_FAILURE);
}
dump_devi = devi;
return (DDI_SUCCESS);
}
static int
dump_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
{
if (cmd != DDI_DETACH)
return (DDI_FAILURE);
ddi_remove_minor_node(devi, NULL);
return (DDI_SUCCESS);
}
/*ARGSUSED*/
static int
dump_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
{
switch (infocmd) {
case DDI_INFO_DEVT2DEVINFO:
*result = dump_devi;
return (DDI_SUCCESS);
case DDI_INFO_DEVT2INSTANCE:
*result = 0;
return (DDI_SUCCESS);
}
return (DDI_FAILURE);
}
/*ARGSUSED*/
int
dump_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *cred, int *rvalp)
{
uint64_t size;
uint64_t dumpsize_in_pages;
int error = 0;
char *pathbuf = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
char uuidbuf[36 + 1];
size_t len;
vnode_t *vp;
switch (cmd) {
case DIOCGETDUMPSIZE:
if (dump_conflags & DUMP_ALL)
size = ptob((uint64_t)physmem) / DUMP_COMPRESS_RATIO;
else {
/*
* We can't give a good answer for the DUMP_CURPROC
* because we won't know which process to use until it
* causes a panic. We'll therefore punt and give the
* caller the size for the kernel.
*
* This kernel size equation takes care of the
* boot time kernel footprint and also accounts
* for availrmem changes due to user explicit locking.
* Refer to common/vm/vm_page.c for an explanation
* of these counters.
*/
dumpsize_in_pages = (physinstalled - obp_pages -
availrmem -
anon_segkp_pages_locked -
k_anoninfo.ani_mem_resv -
pages_locked -
pages_claimed -
pages_useclaim);
/*
* Protect against vm vagaries.
*/
if (dumpsize_in_pages > (uint64_t)physmem)
dumpsize_in_pages = (uint64_t)physmem;
size = ptob(dumpsize_in_pages) / DUMP_COMPRESS_RATIO;
}
if (copyout(&size, (void *)arg, sizeof (size)) < 0)
error = EFAULT;
break;
case DIOCGETCONF:
mutex_enter(&dump_lock);
*rvalp = dump_conflags;
if (dumpvp && !(dumpvp->v_flag & VISSWAP))
*rvalp |= DUMP_EXCL;
mutex_exit(&dump_lock);
break;
case DIOCSETCONF:
mutex_enter(&dump_lock);
if (arg == DUMP_KERNEL || arg == DUMP_ALL ||
arg == DUMP_CURPROC)
dump_conflags = arg;
else
error = EINVAL;
mutex_exit(&dump_lock);
break;
case DIOCGETDEV:
mutex_enter(&dump_lock);
if (dumppath == NULL) {
mutex_exit(&dump_lock);
error = ENODEV;
break;
}
(void) strcpy(pathbuf, dumppath);
mutex_exit(&dump_lock);
error = copyoutstr(pathbuf, (void *)arg, MAXPATHLEN, NULL);
break;
case DIOCSETDEV:
case DIOCTRYDEV:
if ((error = copyinstr((char *)arg, pathbuf, MAXPATHLEN,
NULL)) != 0 || (error = lookupname(pathbuf, UIO_SYSSPACE,
FOLLOW, NULLVPP, &vp)) != 0)
break;
mutex_enter(&dump_lock);
if (vp->v_type == VBLK)
error = dumpinit(vp, pathbuf, cmd == DIOCTRYDEV);
else
error = ENOTBLK;
mutex_exit(&dump_lock);
VN_RELE(vp);
break;
case DIOCDUMP:
mutex_enter(&dump_lock);
if (dumpvp == NULL)
error = ENODEV;
else if (dumpvp->v_flag & VISSWAP)
error = EBUSY;
else
dumpsys();
mutex_exit(&dump_lock);
break;
case DIOCSETUUID:
if ((error = copyinstr((char *)arg, uuidbuf, sizeof (uuidbuf),
&len)) != 0)
break;
if (len != 37) {
error = EINVAL;
break;
}
error = dump_set_uuid(uuidbuf);
break;
case DIOCGETUUID:
error = copyoutstr(dump_get_uuid(), (void *)arg, 37, NULL);
break;
case DIOCRMDEV:
mutex_enter(&dump_lock);
if (dumpvp != NULL)
dumpfini();
mutex_exit(&dump_lock);
break;
default:
error = ENXIO;
}
kmem_free(pathbuf, MAXPATHLEN);
return (error);
}
struct cb_ops dump_cb_ops = {
nulldev, /* open */
nulldev, /* close */
nodev, /* strategy */
nodev, /* print */
nodev, /* dump */
nodev, /* read */
nodev, /* write */
dump_ioctl, /* ioctl */
nodev, /* devmap */
nodev, /* mmap */
nodev, /* segmap */
nochpoll, /* poll */
ddi_prop_op, /* prop_op */
0, /* streamtab */
D_NEW|D_MP /* Driver compatibility flag */
};
struct dev_ops dump_ops = {
DEVO_REV, /* devo_rev, */
0, /* refcnt */
dump_info, /* info */
nulldev, /* identify */
nulldev, /* probe */
dump_attach, /* attach */
dump_detach, /* detach */
nodev, /* reset */
&dump_cb_ops, /* driver operations */
(struct bus_ops *)0, /* bus operations */
NULL, /* power */
ddi_quiesce_not_needed, /* quiesce */
};
static struct modldrv modldrv = {
&mod_driverops, "crash dump driver", &dump_ops,
};
static struct modlinkage modlinkage = {
MODREV_1, (void *)&modldrv, NULL
};
int
_init(void)
{
return (mod_install(&modlinkage));
}
int
_fini(void)
{
return (mod_remove(&modlinkage));
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&modlinkage, modinfop));
}
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