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/*
* 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"
/*
* System call to checkpoint and resume the currently running kernel
*/
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/modctl.h>
#include <sys/syscall.h>
#include <sys/cred.h>
#include <sys/uadmin.h>
#include <sys/cmn_err.h>
#include <sys/systm.h>
#include <sys/cpr.h>
#include <sys/swap.h>
#include <sys/vfs.h>
#include <sys/autoconf.h>
#include <sys/machsystm.h>
extern int i_cpr_is_supported(void);
extern int cpr_is_ufs(struct vfs *);
extern int cpr_check_spec_statefile(void);
extern int cpr_reusable_mount_check(void);
extern void cpr_forget_cprconfig(void);
extern int i_cpr_reusable_supported(void);
extern int i_cpr_reusefini(void);
extern struct mod_ops mod_miscops;
static struct modlmisc modlmisc = {
&mod_miscops, "checkpoint resume"
};
static struct modlinkage modlinkage = {
MODREV_1, (void *)&modlmisc, NULL
};
char _depends_on[] = "misc/bootdev"; /* i_devname_to_promname() */
int cpr_reusable_mode;
kmutex_t cpr_slock; /* cpr serial lock */
cpr_t cpr_state;
int cpr_debug;
int cpr_test_mode; /* true if called via uadmin testmode */
/*
* All the loadable module related code follows
*/
int
_init(void)
{
register int e;
if ((e = mod_install(&modlinkage)) == 0) {
mutex_init(&cpr_slock, NULL, MUTEX_DEFAULT, NULL);
}
return (e);
}
int
_fini(void)
{
register int e;
if ((e = mod_remove(&modlinkage)) == 0) {
mutex_destroy(&cpr_slock);
}
return (e);
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&modlinkage, modinfop));
}
int
cpr(int fcn)
{
static const char noswapstr[] = "reusable statefile requires "
"that no swap area be configured.\n";
static const char blockstr[] = "reusable statefile must be "
"a block device. See power.conf(4) and pmconfig(1M).\n";
static const char normalfmt[] = "cannot run normal "
"checkpoint/resume when in reusable statefile mode. "
"use uadmin A_FREEZE AD_REUSEFINI (uadmin %d %d) "
"to exit reusable statefile mode.\n";
static const char modefmt[] = "%s in reusable mode.\n";
register int rc = 0;
extern int cpr_init(int);
extern void cpr_done(void);
/*
* Need to know if we're in reusable mode, but we will likely have
* rebooted since REUSEINIT, so we have to get the info from the
* file system
*/
if (!cpr_reusable_mode)
cpr_reusable_mode = cpr_get_reusable_mode();
cpr_forget_cprconfig();
switch (fcn) {
case AD_CPR_REUSEINIT:
if (!i_cpr_reusable_supported())
return (ENOTSUP);
if (!cpr_statefile_is_spec()) {
cpr_err(CE_CONT, blockstr);
return (EINVAL);
}
if ((rc = cpr_check_spec_statefile()) != 0)
return (rc);
if (swapinfo) {
cpr_err(CE_CONT, noswapstr);
return (EINVAL);
}
cpr_test_mode = 0;
break;
case AD_CPR_NOCOMPRESS:
case AD_CPR_COMPRESS:
case AD_CPR_FORCE:
if (cpr_reusable_mode) {
cpr_err(CE_CONT, normalfmt, A_FREEZE, AD_REUSEFINI);
return (ENOTSUP);
}
cpr_test_mode = 0;
break;
case AD_CPR_REUSABLE:
if (!i_cpr_reusable_supported())
return (ENOTSUP);
if (!cpr_statefile_is_spec()) {
cpr_err(CE_CONT, blockstr);
return (EINVAL);
}
if ((rc = cpr_check_spec_statefile()) != 0)
return (rc);
if (swapinfo) {
cpr_err(CE_CONT, noswapstr);
return (EINVAL);
}
if ((rc = cpr_reusable_mount_check()) != 0)
return (rc);
cpr_test_mode = 0;
break;
case AD_CPR_REUSEFINI:
if (!i_cpr_reusable_supported())
return (ENOTSUP);
cpr_test_mode = 0;
break;
case AD_CPR_TESTZ:
case AD_CPR_TESTNOZ:
case AD_CPR_TESTHALT:
if (cpr_reusable_mode) {
cpr_err(CE_CONT, normalfmt, A_FREEZE, AD_REUSEFINI);
return (ENOTSUP);
}
cpr_test_mode = 1;
break;
case AD_CPR_CHECK:
if (!i_cpr_is_supported() || cpr_reusable_mode)
return (ENOTSUP);
return (0);
case AD_CPR_PRINT:
CPR_STAT_EVENT_END("POST CPR DELAY");
cpr_stat_event_print();
return (0);
case AD_CPR_DEBUG0:
cpr_debug = 0;
return (0);
case AD_CPR_DEBUG1:
case AD_CPR_DEBUG2:
case AD_CPR_DEBUG3:
case AD_CPR_DEBUG4:
case AD_CPR_DEBUG5:
case AD_CPR_DEBUG7:
case AD_CPR_DEBUG8:
cpr_debug |= CPR_DEBUG_BIT(fcn);
return (0);
case AD_CPR_DEBUG9:
cpr_debug |= LEVEL6;
return (0);
default:
return (ENOTSUP);
}
if (!i_cpr_is_supported() || !cpr_is_ufs(rootvfs))
return (ENOTSUP);
if (fcn == AD_CPR_REUSEINIT) {
if (mutex_tryenter(&cpr_slock) == 0)
return (EBUSY);
if (cpr_reusable_mode) {
cpr_err(CE_CONT, modefmt, "already");
mutex_exit(&cpr_slock);
return (EBUSY);
}
rc = i_cpr_reuseinit();
mutex_exit(&cpr_slock);
return (rc);
}
if (fcn == AD_CPR_REUSEFINI) {
if (mutex_tryenter(&cpr_slock) == 0)
return (EBUSY);
if (!cpr_reusable_mode) {
cpr_err(CE_CONT, modefmt, "not");
mutex_exit(&cpr_slock);
return (EINVAL);
}
rc = i_cpr_reusefini();
mutex_exit(&cpr_slock);
return (rc);
}
/*
* acquire cpr serial lock and init cpr state structure.
*/
if (rc = cpr_init(fcn))
return (rc);
if (fcn == AD_CPR_REUSABLE) {
if ((rc = i_cpr_check_cprinfo()) != 0) {
mutex_exit(&cpr_slock);
return (rc);
}
}
/*
* Call the main cpr routine. If we are successful, we will be coming
* down from the resume side, otherwise we are still in suspend.
*/
cpr_err(CE_CONT, "System is being suspended");
if (rc = cpr_main()) {
CPR->c_flags |= C_ERROR;
cpr_err(CE_NOTE, "Suspend operation failed.");
} else if (CPR->c_flags & C_SUSPENDING) {
extern void cpr_power_down();
/*
* Back from a successful checkpoint
*/
if (fcn == AD_CPR_TESTZ || fcn == AD_CPR_TESTNOZ) {
mdboot(0, AD_BOOT, "", B_FALSE);
/* NOTREACHED */
}
/* make sure there are no more changes to the device tree */
devtree_freeze();
/*
* stop other cpus and raise our priority. since there is only
* one active cpu after this, and our priority will be too high
* for us to be preempted, we're essentially single threaded
* from here on out.
*/
stop_other_cpus();
(void) spl6();
/*
* try and reset leaf devices. reset_leaves() should only
* be called when there are no other threads that could be
* accessing devices
*/
reset_leaves();
/*
* If cpr_power_down() succeeds, it'll not return.
*
* Drives with write-cache enabled need to flush
* their cache.
*/
if (fcn != AD_CPR_TESTHALT)
cpr_power_down();
errp("(Done. Please Switch Off)\n");
halt(NULL);
/* NOTREACHED */
}
/*
* For resuming: release resources and the serial lock.
*/
cpr_done();
return (rc);
}
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