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