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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" |
188f24c2 XW |
15 | #include "sysemu/watchdog.h" |
16 | #include "hw/sysbus.h" | |
17 | #include "qemu/timer.h" | |
18 | #include "hw/watchdog/wdt_diag288.h" | |
19 | ||
20 | static WatchdogTimerModel model = { | |
21 | .wdt_name = TYPE_WDT_DIAG288, | |
22 | .wdt_description = "diag288 device for s390x platform", | |
23 | }; | |
24 | ||
d67f5fe6 XW |
25 | static const VMStateDescription vmstate_diag288 = { |
26 | .name = "vmstate_diag288", | |
27 | .version_id = 0, | |
28 | .minimum_version_id = 0, | |
29 | .fields = (VMStateField[]) { | |
30 | VMSTATE_TIMER_PTR(timer, DIAG288State), | |
31 | VMSTATE_BOOL(enabled, DIAG288State), | |
32 | VMSTATE_END_OF_LIST() | |
33 | } | |
34 | }; | |
35 | ||
188f24c2 XW |
36 | static void wdt_diag288_reset(DeviceState *dev) |
37 | { | |
38 | DIAG288State *diag288 = DIAG288(dev); | |
39 | ||
40 | diag288->enabled = false; | |
41 | timer_del(diag288->timer); | |
42 | } | |
43 | ||
0c7322cf XW |
44 | static void diag288_reset(void *opaque) |
45 | { | |
46 | DeviceState *diag288 = opaque; | |
47 | ||
48 | wdt_diag288_reset(diag288); | |
49 | } | |
50 | ||
188f24c2 XW |
51 | static void diag288_timer_expired(void *dev) |
52 | { | |
53 | qemu_log_mask(CPU_LOG_RESET, "Watchdog timer expired.\n"); | |
fe345a3d SS |
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. */ | |
fba9110f BT |
58 | switch (get_watchdog_action()) { |
59 | case WDT_DEBUG: | |
60 | case WDT_NONE: | |
61 | case WDT_PAUSE: | |
fe345a3d SS |
62 | break; |
63 | default: | |
64 | wdt_diag288_reset(dev); | |
fba9110f | 65 | } |
fe345a3d | 66 | watchdog_perform_action(); |
188f24c2 XW |
67 | } |
68 | ||
69 | static int wdt_diag288_handle_timer(DIAG288State *diag288, | |
70 | uint64_t func, uint64_t timeout) | |
71 | { | |
72 | switch (func) { | |
73 | case WDT_DIAG288_INIT: | |
74 | diag288->enabled = true; | |
75 | /* fall through */ | |
76 | case WDT_DIAG288_CHANGE: | |
77 | if (!diag288->enabled) { | |
78 | return -1; | |
79 | } | |
80 | timer_mod(diag288->timer, | |
81 | qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + | |
82 | timeout * get_ticks_per_sec()); | |
83 | break; | |
84 | case WDT_DIAG288_CANCEL: | |
85 | if (!diag288->enabled) { | |
86 | return -1; | |
87 | } | |
88 | diag288->enabled = false; | |
89 | timer_del(diag288->timer); | |
90 | break; | |
91 | default: | |
92 | return -1; | |
93 | } | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | static void wdt_diag288_realize(DeviceState *dev, Error **errp) | |
99 | { | |
100 | DIAG288State *diag288 = DIAG288(dev); | |
101 | ||
0c7322cf | 102 | qemu_register_reset(diag288_reset, diag288); |
188f24c2 XW |
103 | diag288->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, diag288_timer_expired, |
104 | dev); | |
105 | } | |
106 | ||
107 | static void wdt_diag288_unrealize(DeviceState *dev, Error **errp) | |
108 | { | |
109 | DIAG288State *diag288 = DIAG288(dev); | |
110 | ||
111 | timer_del(diag288->timer); | |
112 | timer_free(diag288->timer); | |
113 | } | |
114 | ||
115 | static void wdt_diag288_class_init(ObjectClass *klass, void *data) | |
116 | { | |
117 | DeviceClass *dc = DEVICE_CLASS(klass); | |
118 | DIAG288Class *diag288 = DIAG288_CLASS(klass); | |
119 | ||
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); | |
d67f5fe6 | 124 | dc->vmsd = &vmstate_diag288; |
188f24c2 XW |
125 | diag288->handle_timer = wdt_diag288_handle_timer; |
126 | } | |
127 | ||
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), | |
134 | }; | |
135 | ||
136 | static void wdt_diag288_register_types(void) | |
137 | { | |
138 | watchdog_add_model(&model); | |
139 | type_register_static(&wdt_diag288_info); | |
140 | } | |
141 | ||
142 | type_init(wdt_diag288_register_types) |