diff options
Diffstat (limited to 'arch/x86/xen/manage.c')
-rw-r--r-- | arch/x86/xen/manage.c | 143 |
1 files changed, 0 insertions, 143 deletions
diff --git a/arch/x86/xen/manage.c b/arch/x86/xen/manage.c deleted file mode 100644 index aa7af9e6abc0..000000000000 --- a/arch/x86/xen/manage.c +++ /dev/null | |||
@@ -1,143 +0,0 @@ | |||
1 | /* | ||
2 | * Handle extern requests for shutdown, reboot and sysrq | ||
3 | */ | ||
4 | #include <linux/kernel.h> | ||
5 | #include <linux/err.h> | ||
6 | #include <linux/reboot.h> | ||
7 | #include <linux/sysrq.h> | ||
8 | |||
9 | #include <xen/xenbus.h> | ||
10 | |||
11 | #define SHUTDOWN_INVALID -1 | ||
12 | #define SHUTDOWN_POWEROFF 0 | ||
13 | #define SHUTDOWN_SUSPEND 2 | ||
14 | /* Code 3 is SHUTDOWN_CRASH, which we don't use because the domain can only | ||
15 | * report a crash, not be instructed to crash! | ||
16 | * HALT is the same as POWEROFF, as far as we're concerned. The tools use | ||
17 | * the distinction when we return the reason code to them. | ||
18 | */ | ||
19 | #define SHUTDOWN_HALT 4 | ||
20 | |||
21 | /* Ignore multiple shutdown requests. */ | ||
22 | static int shutting_down = SHUTDOWN_INVALID; | ||
23 | |||
24 | static void shutdown_handler(struct xenbus_watch *watch, | ||
25 | const char **vec, unsigned int len) | ||
26 | { | ||
27 | char *str; | ||
28 | struct xenbus_transaction xbt; | ||
29 | int err; | ||
30 | |||
31 | if (shutting_down != SHUTDOWN_INVALID) | ||
32 | return; | ||
33 | |||
34 | again: | ||
35 | err = xenbus_transaction_start(&xbt); | ||
36 | if (err) | ||
37 | return; | ||
38 | |||
39 | str = (char *)xenbus_read(xbt, "control", "shutdown", NULL); | ||
40 | /* Ignore read errors and empty reads. */ | ||
41 | if (XENBUS_IS_ERR_READ(str)) { | ||
42 | xenbus_transaction_end(xbt, 1); | ||
43 | return; | ||
44 | } | ||
45 | |||
46 | xenbus_write(xbt, "control", "shutdown", ""); | ||
47 | |||
48 | err = xenbus_transaction_end(xbt, 0); | ||
49 | if (err == -EAGAIN) { | ||
50 | kfree(str); | ||
51 | goto again; | ||
52 | } | ||
53 | |||
54 | if (strcmp(str, "poweroff") == 0 || | ||
55 | strcmp(str, "halt") == 0) | ||
56 | orderly_poweroff(false); | ||
57 | else if (strcmp(str, "reboot") == 0) | ||
58 | ctrl_alt_del(); | ||
59 | else { | ||
60 | printk(KERN_INFO "Ignoring shutdown request: %s\n", str); | ||
61 | shutting_down = SHUTDOWN_INVALID; | ||
62 | } | ||
63 | |||
64 | kfree(str); | ||
65 | } | ||
66 | |||
67 | static void sysrq_handler(struct xenbus_watch *watch, const char **vec, | ||
68 | unsigned int len) | ||
69 | { | ||
70 | char sysrq_key = '\0'; | ||
71 | struct xenbus_transaction xbt; | ||
72 | int err; | ||
73 | |||
74 | again: | ||
75 | err = xenbus_transaction_start(&xbt); | ||
76 | if (err) | ||
77 | return; | ||
78 | if (!xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key)) { | ||
79 | printk(KERN_ERR "Unable to read sysrq code in " | ||
80 | "control/sysrq\n"); | ||
81 | xenbus_transaction_end(xbt, 1); | ||
82 | return; | ||
83 | } | ||
84 | |||
85 | if (sysrq_key != '\0') | ||
86 | xenbus_printf(xbt, "control", "sysrq", "%c", '\0'); | ||
87 | |||
88 | err = xenbus_transaction_end(xbt, 0); | ||
89 | if (err == -EAGAIN) | ||
90 | goto again; | ||
91 | |||
92 | if (sysrq_key != '\0') | ||
93 | handle_sysrq(sysrq_key, NULL); | ||
94 | } | ||
95 | |||
96 | static struct xenbus_watch shutdown_watch = { | ||
97 | .node = "control/shutdown", | ||
98 | .callback = shutdown_handler | ||
99 | }; | ||
100 | |||
101 | static struct xenbus_watch sysrq_watch = { | ||
102 | .node = "control/sysrq", | ||
103 | .callback = sysrq_handler | ||
104 | }; | ||
105 | |||
106 | static int setup_shutdown_watcher(void) | ||
107 | { | ||
108 | int err; | ||
109 | |||
110 | err = register_xenbus_watch(&shutdown_watch); | ||
111 | if (err) { | ||
112 | printk(KERN_ERR "Failed to set shutdown watcher\n"); | ||
113 | return err; | ||
114 | } | ||
115 | |||
116 | err = register_xenbus_watch(&sysrq_watch); | ||
117 | if (err) { | ||
118 | printk(KERN_ERR "Failed to set sysrq watcher\n"); | ||
119 | return err; | ||
120 | } | ||
121 | |||
122 | return 0; | ||
123 | } | ||
124 | |||
125 | static int shutdown_event(struct notifier_block *notifier, | ||
126 | unsigned long event, | ||
127 | void *data) | ||
128 | { | ||
129 | setup_shutdown_watcher(); | ||
130 | return NOTIFY_DONE; | ||
131 | } | ||
132 | |||
133 | static int __init setup_shutdown_event(void) | ||
134 | { | ||
135 | static struct notifier_block xenstore_notifier = { | ||
136 | .notifier_call = shutdown_event | ||
137 | }; | ||
138 | register_xenstore_notifier(&xenstore_notifier); | ||
139 | |||
140 | return 0; | ||
141 | } | ||
142 | |||
143 | subsys_initcall(setup_shutdown_event); | ||