2 * watchdog device diag288 support
4 * Copyright IBM, Corp. 2015
7 * Xu Wang <gesaint@linux.vnet.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2 or (at your
10 * option) any later version. See the COPYING file in the top-level directory.
14 #include "qemu/osdep.h"
15 #include "sysemu/watchdog.h"
16 #include "hw/sysbus.h"
17 #include "qemu/timer.h"
18 #include "hw/watchdog/wdt_diag288.h"
20 static WatchdogTimerModel model
= {
21 .wdt_name
= TYPE_WDT_DIAG288
,
22 .wdt_description
= "diag288 device for s390x platform",
25 static const VMStateDescription vmstate_diag288
= {
26 .name
= "vmstate_diag288",
28 .minimum_version_id
= 0,
29 .fields
= (VMStateField
[]) {
30 VMSTATE_TIMER_PTR(timer
, DIAG288State
),
31 VMSTATE_BOOL(enabled
, DIAG288State
),
36 static void wdt_diag288_reset(DeviceState
*dev
)
38 DIAG288State
*diag288
= DIAG288(dev
);
40 diag288
->enabled
= false;
41 timer_del(diag288
->timer
);
44 static void diag288_reset(void *opaque
)
46 DeviceState
*diag288
= opaque
;
48 wdt_diag288_reset(diag288
);
51 static void diag288_timer_expired(void *dev
)
53 qemu_log_mask(CPU_LOG_RESET
, "Watchdog timer expired.\n");
54 /* Reset the watchdog only if the guest gets notified about
55 * expiry. watchdog_perform_action() may temporarily relinquish
56 * the BQL; reset before triggering the action to avoid races with
57 * diag288 instructions. */
58 switch (get_watchdog_action()) {
64 wdt_diag288_reset(dev
);
66 watchdog_perform_action();
69 static int wdt_diag288_handle_timer(DIAG288State
*diag288
,
70 uint64_t func
, uint64_t timeout
)
73 case WDT_DIAG288_INIT
:
74 diag288
->enabled
= true;
76 case WDT_DIAG288_CHANGE
:
77 if (!diag288
->enabled
) {
80 timer_mod(diag288
->timer
,
81 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
) +
82 timeout
* get_ticks_per_sec());
84 case WDT_DIAG288_CANCEL
:
85 if (!diag288
->enabled
) {
88 diag288
->enabled
= false;
89 timer_del(diag288
->timer
);
98 static void wdt_diag288_realize(DeviceState
*dev
, Error
**errp
)
100 DIAG288State
*diag288
= DIAG288(dev
);
102 qemu_register_reset(diag288_reset
, diag288
);
103 diag288
->timer
= timer_new_ns(QEMU_CLOCK_VIRTUAL
, diag288_timer_expired
,
107 static void wdt_diag288_unrealize(DeviceState
*dev
, Error
**errp
)
109 DIAG288State
*diag288
= DIAG288(dev
);
111 timer_del(diag288
->timer
);
112 timer_free(diag288
->timer
);
115 static void wdt_diag288_class_init(ObjectClass
*klass
, void *data
)
117 DeviceClass
*dc
= DEVICE_CLASS(klass
);
118 DIAG288Class
*diag288
= DIAG288_CLASS(klass
);
120 dc
->realize
= wdt_diag288_realize
;
121 dc
->unrealize
= wdt_diag288_unrealize
;
122 dc
->reset
= wdt_diag288_reset
;
123 set_bit(DEVICE_CATEGORY_MISC
, dc
->categories
);
124 dc
->vmsd
= &vmstate_diag288
;
125 diag288
->handle_timer
= wdt_diag288_handle_timer
;
128 static const TypeInfo wdt_diag288_info
= {
129 .class_init
= wdt_diag288_class_init
,
130 .parent
= TYPE_DEVICE
,
131 .name
= TYPE_WDT_DIAG288
,
132 .instance_size
= sizeof(DIAG288State
),
133 .class_size
= sizeof(DIAG288Class
),
136 static void wdt_diag288_register_types(void)
138 watchdog_add_model(&model
);
139 type_register_static(&wdt_diag288_info
);
142 type_init(wdt_diag288_register_types
)