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188f24c2 XW |
1 | /* |
2 | * watchdog device diag288 support | |
3 | * | |
4 | * Copyright IBM, Corp. 2015 | |
5 | * | |
6 | * Authors: | |
7 | * Xu Wang <gesaint@linux.vnet.ibm.com> | |
8 | * | |
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. | |
11 | * | |
12 | */ | |
13 | ||
9615495a | 14 | #include "qemu/osdep.h" |
71e8a915 | 15 | #include "sysemu/reset.h" |
188f24c2 XW |
16 | #include "sysemu/watchdog.h" |
17 | #include "hw/sysbus.h" | |
18 | #include "qemu/timer.h" | |
19 | #include "hw/watchdog/wdt_diag288.h" | |
d6454270 | 20 | #include "migration/vmstate.h" |
03dd024f | 21 | #include "qemu/log.h" |
0b8fa32f | 22 | #include "qemu/module.h" |
188f24c2 XW |
23 | |
24 | static WatchdogTimerModel model = { | |
25 | .wdt_name = TYPE_WDT_DIAG288, | |
26 | .wdt_description = "diag288 device for s390x platform", | |
27 | }; | |
28 | ||
d67f5fe6 XW |
29 | static const VMStateDescription vmstate_diag288 = { |
30 | .name = "vmstate_diag288", | |
31 | .version_id = 0, | |
32 | .minimum_version_id = 0, | |
33 | .fields = (VMStateField[]) { | |
34 | VMSTATE_TIMER_PTR(timer, DIAG288State), | |
35 | VMSTATE_BOOL(enabled, DIAG288State), | |
36 | VMSTATE_END_OF_LIST() | |
37 | } | |
38 | }; | |
39 | ||
188f24c2 XW |
40 | static void wdt_diag288_reset(DeviceState *dev) |
41 | { | |
42 | DIAG288State *diag288 = DIAG288(dev); | |
43 | ||
44 | diag288->enabled = false; | |
45 | timer_del(diag288->timer); | |
46 | } | |
47 | ||
0c7322cf XW |
48 | static void diag288_reset(void *opaque) |
49 | { | |
50 | DeviceState *diag288 = opaque; | |
51 | ||
52 | wdt_diag288_reset(diag288); | |
53 | } | |
54 | ||
188f24c2 XW |
55 | static void diag288_timer_expired(void *dev) |
56 | { | |
57 | qemu_log_mask(CPU_LOG_RESET, "Watchdog timer expired.\n"); | |
fe345a3d SS |
58 | /* Reset the watchdog only if the guest gets notified about |
59 | * expiry. watchdog_perform_action() may temporarily relinquish | |
60 | * the BQL; reset before triggering the action to avoid races with | |
61 | * diag288 instructions. */ | |
fba9110f | 62 | switch (get_watchdog_action()) { |
4c7f4426 MP |
63 | case WATCHDOG_ACTION_DEBUG: |
64 | case WATCHDOG_ACTION_NONE: | |
65 | case WATCHDOG_ACTION_PAUSE: | |
fe345a3d SS |
66 | break; |
67 | default: | |
68 | wdt_diag288_reset(dev); | |
fba9110f | 69 | } |
fe345a3d | 70 | watchdog_perform_action(); |
188f24c2 XW |
71 | } |
72 | ||
73 | static int wdt_diag288_handle_timer(DIAG288State *diag288, | |
74 | uint64_t func, uint64_t timeout) | |
75 | { | |
76 | switch (func) { | |
77 | case WDT_DIAG288_INIT: | |
78 | diag288->enabled = true; | |
79 | /* fall through */ | |
80 | case WDT_DIAG288_CHANGE: | |
81 | if (!diag288->enabled) { | |
82 | return -1; | |
83 | } | |
84 | timer_mod(diag288->timer, | |
85 | qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + | |
73bcb24d | 86 | timeout * NANOSECONDS_PER_SECOND); |
188f24c2 XW |
87 | break; |
88 | case WDT_DIAG288_CANCEL: | |
89 | if (!diag288->enabled) { | |
90 | return -1; | |
91 | } | |
92 | diag288->enabled = false; | |
93 | timer_del(diag288->timer); | |
94 | break; | |
95 | default: | |
96 | return -1; | |
97 | } | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | static void wdt_diag288_realize(DeviceState *dev, Error **errp) | |
103 | { | |
104 | DIAG288State *diag288 = DIAG288(dev); | |
105 | ||
0c7322cf | 106 | qemu_register_reset(diag288_reset, diag288); |
188f24c2 XW |
107 | diag288->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, diag288_timer_expired, |
108 | dev); | |
109 | } | |
110 | ||
b69c3c21 | 111 | static void wdt_diag288_unrealize(DeviceState *dev) |
188f24c2 XW |
112 | { |
113 | DIAG288State *diag288 = DIAG288(dev); | |
114 | ||
115 | timer_del(diag288->timer); | |
116 | timer_free(diag288->timer); | |
117 | } | |
118 | ||
119 | static void wdt_diag288_class_init(ObjectClass *klass, void *data) | |
120 | { | |
121 | DeviceClass *dc = DEVICE_CLASS(klass); | |
122 | DIAG288Class *diag288 = DIAG288_CLASS(klass); | |
123 | ||
124 | dc->realize = wdt_diag288_realize; | |
125 | dc->unrealize = wdt_diag288_unrealize; | |
126 | dc->reset = wdt_diag288_reset; | |
84ebd3e8 | 127 | dc->hotpluggable = false; |
188f24c2 | 128 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
d67f5fe6 | 129 | dc->vmsd = &vmstate_diag288; |
188f24c2 XW |
130 | diag288->handle_timer = wdt_diag288_handle_timer; |
131 | } | |
132 | ||
133 | static const TypeInfo wdt_diag288_info = { | |
134 | .class_init = wdt_diag288_class_init, | |
135 | .parent = TYPE_DEVICE, | |
136 | .name = TYPE_WDT_DIAG288, | |
137 | .instance_size = sizeof(DIAG288State), | |
138 | .class_size = sizeof(DIAG288Class), | |
139 | }; | |
140 | ||
141 | static void wdt_diag288_register_types(void) | |
142 | { | |
143 | watchdog_add_model(&model); | |
144 | type_register_static(&wdt_diag288_info); | |
145 | } | |
146 | ||
147 | type_init(wdt_diag288_register_types) |