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s390x/watchdog: introduce diag288 watchdog device

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This patch introduces a new diag288 watchdog device that will, just like
other watchdogs, monitor a guest and take corresponding actions when it
detects that the guest is not responding.

diag288 is s390x specific. The wiring to s390x KVM will be done in
separate patches.

Signed-off-by: Xu Wang <gesaint@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
[split out qemu-option.hx base changes]
This commit is contained in:
Xu Wang 2015-02-05 18:28:32 +08:00 • committed by Christian Borntraeger
parent d7933ef3ac
commit 188f24c2c1
5 changed files with 151 additions and 0 deletions
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1
hw/watchdog/Makefile.objs
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@ -1,3 +1,4 @@
common-obj-y += watchdog.o
common-obj-$(CONFIG_WDT_IB6300ESB) += wdt_i6300esb.o
common-obj-$(CONFIG_WDT_IB700) += wdt_ib700.o
common-obj-$(CONFIG_WDT_DIAG288) += wdt_diag288.o

110
hw/watchdog/wdt_diag288.c Normal file
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@ -0,0 +1,110 @@
/*
* watchdog device diag288 support
*
* Copyright IBM, Corp. 2015
*
* Authors:
* Xu Wang <gesaint@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at your
* option) any later version. See the COPYING file in the top-level directory.
*
*/
#include "sysemu/watchdog.h"
#include "hw/sysbus.h"
#include "qemu/timer.h"
#include "hw/watchdog/wdt_diag288.h"
static WatchdogTimerModel model = {
.wdt_name = TYPE_WDT_DIAG288,
.wdt_description = "diag288 device for s390x platform",
};
static void wdt_diag288_reset(DeviceState *dev)
{
DIAG288State *diag288 = DIAG288(dev);
diag288->enabled = false;
timer_del(diag288->timer);
}
static void diag288_timer_expired(void *dev)
{
qemu_log_mask(CPU_LOG_RESET, "Watchdog timer expired.\n");
watchdog_perform_action();
wdt_diag288_reset(dev);
}
static int wdt_diag288_handle_timer(DIAG288State *diag288,
uint64_t func, uint64_t timeout)
{
switch (func) {
case WDT_DIAG288_INIT:
diag288->enabled = true;
/* fall through */
case WDT_DIAG288_CHANGE:
if (!diag288->enabled) {
return -1;
}
timer_mod(diag288->timer,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
timeout * get_ticks_per_sec());
break;
case WDT_DIAG288_CANCEL:
if (!diag288->enabled) {
return -1;
}
diag288->enabled = false;
timer_del(diag288->timer);
break;
default:
return -1;
}
return 0;
}
static void wdt_diag288_realize(DeviceState *dev, Error **errp)
{
DIAG288State *diag288 = DIAG288(dev);
diag288->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, diag288_timer_expired,
dev);
}
static void wdt_diag288_unrealize(DeviceState *dev, Error **errp)
{
DIAG288State *diag288 = DIAG288(dev);
timer_del(diag288->timer);
timer_free(diag288->timer);
}
static void wdt_diag288_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
DIAG288Class *diag288 = DIAG288_CLASS(klass);
dc->realize = wdt_diag288_realize;
dc->unrealize = wdt_diag288_unrealize;
dc->reset = wdt_diag288_reset;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
diag288->handle_timer = wdt_diag288_handle_timer;
}
static const TypeInfo wdt_diag288_info = {
.class_init = wdt_diag288_class_init,
.parent = TYPE_DEVICE,
.name = TYPE_WDT_DIAG288,
.instance_size = sizeof(DIAG288State),
.class_size = sizeof(DIAG288Class),
};
static void wdt_diag288_register_types(void)
{
watchdog_add_model(&model);
type_register_static(&wdt_diag288_info);
}
type_init(wdt_diag288_register_types)