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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 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright 2019 Joyent, Inc.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/var.h>
#include <sys/thread.h>
#include <sys/cpuvar.h>
#include <sys/kstat.h>
#include <sys/uadmin.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/cmn_err.h>
#include <sys/procset.h>
#include <sys/processor.h>
#include <sys/debug.h>
#include <sys/policy.h>
#include <sys/smt.h>
/*
* CPU state diagram
*
* P_SPARE
* P_POWEROFF <---> P_OFFLINE <---> P_ONLINE <---> P_NOINTR
* P_FAULTED
* P_DISABLED
*/
int
p_online_internal_locked(processorid_t cpun, int new_status, int *old_status)
{
cpu_t *cp;
int status;
int error = 0;
int flags = 0;
ASSERT(MUTEX_HELD(&cpu_lock));
if (cpun == P_ALL_SIBLINGS) {
if (new_status != P_DISABLED) {
error = EINVAL;
goto out;
}
return (smt_disable());
}
if ((cp = cpu_get(cpun)) == NULL) {
error = EINVAL;
goto out;
}
if (new_status & P_FORCED)
flags = CPU_FORCED;
*old_status = status = cpu_get_state(cp); /* get processor status */
new_status &= ~P_FORCED;
/*
* Perform credentials check.
*/
switch (new_status) {
case P_STATUS:
goto out;
case P_ONLINE:
case P_OFFLINE:
case P_NOINTR:
case P_FAULTED:
case P_SPARE:
if (secpolicy_ponline(CRED()) != 0)
error = EPERM;
break;
case P_DISABLED:
default:
error = EINVAL;
break;
}
if (error)
goto out;
/*
* return 0 if the CPU is already in the desired new state.
*/
if (status == new_status)
goto out;
switch (new_status) {
case P_ONLINE:
switch (status) {
case P_POWEROFF:
/*
* If CPU is powered off, power it on.
*/
if (error = cpu_poweron(cp))
break;
ASSERT(cpu_get_state(cp) == P_OFFLINE);
/* FALLTHROUGH */
case P_DISABLED:
case P_OFFLINE:
case P_FAULTED:
case P_SPARE:
/*
* If CPU is in one of the offline states,
* bring it online.
*/
error = cpu_online(cp, flags);
break;
case P_NOINTR:
cpu_intr_enable(cp);
break;
}
break;
case P_OFFLINE:
switch (status) {
case P_NOINTR:
/*
* Before we take the CPU offline, we first enable I/O
* interrupts.
*/
cpu_intr_enable(cp);
/* FALLTHROUGH */
case P_ONLINE:
case P_DISABLED:
case P_FAULTED:
case P_SPARE:
/*
* CPU is online, or in a special offline state.
* Take it offline.
*/
error = cpu_offline(cp, flags);
break;
case P_POWEROFF:
/*
* If CPU is powered off, power it on.
*/
error = cpu_poweron(cp);
break;
}
break;
case P_NOINTR:
switch (status) {
case P_POWEROFF:
/*
* if CPU is powered off, power it on.
*/
if (error = cpu_poweron(cp))
break;
ASSERT(cpu_get_state(cp) == P_OFFLINE);
/* FALLTHROUGH */
case P_DISABLED:
case P_OFFLINE:
case P_FAULTED:
case P_SPARE:
/*
* First, bring the CPU online.
*/
if (error = cpu_online(cp, flags))
break;
/* FALLTHROUGH */
case P_ONLINE:
/*
* CPU is now online. Try to disable interrupts.
*/
error = cpu_intr_disable(cp);
break;
}
break;
case P_FAULTED:
switch (status) {
case P_POWEROFF:
/*
* If CPU is powered off, power it on.
*/
if (error = cpu_poweron(cp))
break;
ASSERT(cpu_get_state(cp) == P_OFFLINE);
/*FALLTHROUGH*/
case P_DISABLED:
case P_OFFLINE:
case P_ONLINE:
case P_NOINTR:
case P_SPARE:
/*
* Mark this CPU as faulted.
*/
error = cpu_faulted(cp, flags);
break;
}
break;
case P_SPARE:
switch (status) {
case P_POWEROFF:
/*
* If CPU is powered off, power it on.
*/
if (error = cpu_poweron(cp))
break;
ASSERT(cpu_get_state(cp) == P_OFFLINE);
/*FALLTHROUGH*/
case P_DISABLED:
case P_OFFLINE:
case P_FAULTED:
case P_ONLINE:
case P_NOINTR:
/*
* Mark this CPU as a spare.
*/
error = cpu_spare(cp, flags);
break;
}
break;
}
out:
return (error);
}
int
p_online_internal(processorid_t cpun, int new_status, int *old_status)
{
int rc;
mutex_enter(&cpu_lock); /* protects CPU states */
rc = p_online_internal_locked(cpun, new_status, old_status);
mutex_exit(&cpu_lock);
return (rc);
}
/*
* p_online(2) - get/change processor operational status.
*
* As noted in os/cpu.c, the P_ONLINE and other state constants are for use
* only in this system call path and other paths conveying CPU state to
* userland. In general, other kernel consumers should be using the accessor
* functions in uts/common/os/cpu.c.
*/
int
p_online(processorid_t cpun, int new_status)
{
int ret;
int old_status;
ret = p_online_internal(cpun, new_status, &old_status);
if (ret != 0)
return (set_errno(ret));
return (old_status);
}
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