wdt.c revision 927a453e165c072d45bd6aa2945b3db0fce17c56
0N/A/*
3909N/A * CDDL HEADER START
0N/A *
0N/A * The contents of this file are subject to the terms of the
0N/A * Common Development and Distribution License (the "License").
0N/A * You may not use this file except in compliance with the License.
2362N/A *
0N/A * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
2362N/A * or http://www.opensolaris.org/os/licensing.
0N/A * See the License for the specific language governing permissions
0N/A * and limitations under the License.
0N/A *
0N/A * When distributing Covered Code, include this CDDL HEADER in each
0N/A * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
0N/A * If applicable, add the following below this CDDL HEADER, with the
0N/A * fields enclosed by brackets "[]" replaced with your own identifying
0N/A * information: Portions Copyright [yyyy] [name of copyright owner]
0N/A *
0N/A * CDDL HEADER END
0N/A */
2362N/A/*
2362N/A * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
2362N/A * Use is subject to license terms.
0N/A */
0N/A
0N/A#pragma ident "%Z%%M% %I% %E% SMI"
0N/A
0N/A#include <sys/types.h>
0N/A#include <sys/hsvc.h>
0N/A#include <sys/wdt.h>
2080N/A#include <sys/cmn_err.h>
0N/A#include <sys/kmem.h>
0N/A#include <sys/systm.h>
0N/A#include <sys/sysmacros.h>
0N/A#include <sys/hypervisor_api.h>
0N/A#include <sys/mach_descrip.h>
0N/A#include <sys/mdesc.h>
0N/A
3259N/A#define WDT_ON 1
3259N/A#define WDT_OFF 0
955N/A#define WDT_DEFAULT_RESOLUTION 10 /* 10 milliseconds */
955N/A/*
955N/A * MILLISEC defines the number of milliseconds in a second.
955N/A */
2157N/A#define WDT_MAX_RESOLUTION (1 * MILLISEC) /* 1 second */
2157N/A#define WDT_REGULAR_TIMEOUT (10 * MILLISEC) /* 10 seconds */
0N/A#define WDT_LONG_TIMEOUT (60 * MILLISEC) /* 60 seconds */
0N/A#define WDT_MIN_COREAPI_MAJOR 1
0N/A#define WDT_MIN_COREAPI_MINOR 1
0N/A/*
0N/A * The ratio to calculate the watchdog timer pat interval.
0N/A */
0N/A#define WDT_PAT_INTERVAL(x) ((x) / 2)
0N/A
0N/Aint watchdog_enabled = 1;
0N/A
0N/Astatic void set_watchdog_pat_intervals(void);
2080N/Astatic void config_watchdog(uint64_t, int);
0N/A
0N/A/*
0N/A * Flag used to pat/suspend/resume the watchdog timer.
2080N/A */
0N/Aint watchdog_activated = WDT_OFF;
0N/Astatic uint64_t watchdog_regular_timeout = WDT_REGULAR_TIMEOUT;
0N/Astatic uint64_t watchdog_long_timeout = 0;
2080N/Astatic uint64_t watchdog_resolution = WDT_DEFAULT_RESOLUTION;
0N/Astatic int64_t watchdog_last_pat = 0; /* The time of last pat. */
0N/Astatic int64_t last_pat_interval = 0; /* The pat interval of last pat. */
0N/Astatic int64_t watchdog_long_pat_interval = 0;
2080N/Astatic int64_t watchdog_regular_pat_interval = 0;
0N/A
void
watchdog_init(void)
{
int num_nodes;
int nplat;
md_t *mdp;
mde_cookie_t *listp = NULL;
int listsz;
uint64_t major;
uint64_t minor;
uint64_t watchdog_max_timeout;
if (!watchdog_enabled) {
return;
}
if (hsvc_version(HSVC_GROUP_CORE, &major, &minor) != 0 ||
major != WDT_MIN_COREAPI_MAJOR ||
minor < WDT_MIN_COREAPI_MINOR) {
cmn_err(CE_NOTE, "Disabling watchdog as watchdog services are "
"not available\n");
watchdog_enabled = 0;
return;
}
/*
* Get the watchdog-max-timeout and watchdog-resolution MD properties.
*/
if ((mdp = md_get_handle()) == NULL) {
cmn_err(CE_WARN, "Unable to initialize machine description, "
"watchdog is disabled.");
watchdog_enabled = 0;
return;
}
num_nodes = md_node_count(mdp);
ASSERT(num_nodes > 0);
listsz = num_nodes * sizeof (mde_cookie_t);
listp = kmem_zalloc(listsz, KM_SLEEP);
nplat = md_scan_dag(mdp, md_root_node(mdp),
md_find_name(mdp, "platform"), md_find_name(mdp, "fwd"), listp);
ASSERT(nplat == 1);
if (md_get_prop_val(mdp, listp[0], "watchdog-max-timeout",
&watchdog_max_timeout)) {
cmn_err(CE_WARN, "Cannot read watchdog-max-timeout, watchdog "
"is disabled.");
watchdog_enabled = 0;
kmem_free(listp, listsz);
(void) md_fini_handle(mdp);
return;
}
if (watchdog_max_timeout < WDT_REGULAR_TIMEOUT) {
cmn_err(CE_WARN, "Invalid watchdog-max-timeout value, watchdog "
"is disabled.");
watchdog_enabled = 0;
kmem_free(listp, listsz);
(void) md_fini_handle(mdp);
return;
}
if (md_get_prop_val(mdp, listp[0], "watchdog-resolution",
&watchdog_resolution)) {
cmn_err(CE_WARN, "Cannot read watchdog-resolution, watchdog "
"is disabled.");
watchdog_enabled = 0;
kmem_free(listp, listsz);
(void) md_fini_handle(mdp);
return;
}
if (watchdog_resolution == 0 ||
watchdog_resolution > WDT_MAX_RESOLUTION) {
watchdog_resolution = WDT_DEFAULT_RESOLUTION;
}
kmem_free(listp, listsz);
(void) md_fini_handle(mdp);
watchdog_long_timeout = MIN(WDT_LONG_TIMEOUT, watchdog_max_timeout);
/*
* round the timeout to the nearest smaller value.
*/
watchdog_long_timeout -=
watchdog_long_timeout % watchdog_resolution;
watchdog_regular_timeout -=
watchdog_regular_timeout % watchdog_resolution;
set_watchdog_pat_intervals();
config_watchdog(watchdog_regular_timeout, WDT_ON);
}
/*
* Pat the watchdog timer periodically, for regular pat in tod_get when
* the kernel runs normally and long pat in deadman when panicking.
*/
void
watchdog_pat()
{
int64_t pat_interval;
int64_t current_lbolt64;
uint64_t timeout;
if (watchdog_enabled && watchdog_activated) {
if (panicstr) {
/*
* long timeout is only used while panicking.
*/
timeout = watchdog_long_timeout;
pat_interval = watchdog_long_pat_interval;
} else {
timeout = watchdog_regular_timeout;
pat_interval = watchdog_regular_pat_interval;
}
current_lbolt64 = lbolt64;
if ((current_lbolt64 - watchdog_last_pat)
>= last_pat_interval) {
/*
* Pat the watchdog via hv api:
*/
config_watchdog(timeout, WDT_ON);
last_pat_interval = pat_interval;
watchdog_last_pat = current_lbolt64;
}
}
}
/*
* We don't save/restore the remaining watchdog timeout time at present.
*/
void
watchdog_suspend()
{
if (watchdog_enabled && watchdog_activated) {
config_watchdog(0, WDT_OFF);
}
}
/*
* We don't save/restore the remaining watchdog timeout time at present.
*/
void
watchdog_resume()
{
if (watchdog_enabled && !watchdog_activated) {
if (panicstr) {
config_watchdog(watchdog_long_timeout, WDT_ON);
} else {
config_watchdog(watchdog_regular_timeout, WDT_ON);
}
}
}
void
watchdog_clear()
{
if (watchdog_enabled && watchdog_activated) {
config_watchdog(0, WDT_OFF);
}
}
/*
* Set the pat intervals for both regular (when Solaris is running),
* and long timeout (i.e., when panicking) cases.
*/
static void
set_watchdog_pat_intervals(void)
{
watchdog_regular_pat_interval =
MSEC_TO_TICK(WDT_PAT_INTERVAL(watchdog_regular_timeout));
watchdog_long_pat_interval =
MSEC_TO_TICK(WDT_PAT_INTERVAL(watchdog_long_timeout));
}
static void
config_watchdog(uint64_t timeout, int new_state)
{
uint64_t time_remaining;
uint64_t ret;
watchdog_activated = new_state;
ret = hv_mach_set_watchdog(timeout, &time_remaining);
if (ret != H_EOK) {
cmn_err(CE_WARN, "Failed to operate on the watchdog. "
"Error = 0x%lx", ret);
watchdog_enabled = 0;
}
}