1 | /* $Id: shutdown_xenbus.c,v 1.7 2011/09/20 00:12:24 jym Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c)2006 YAMAMOTO Takashi, |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
26 | * SUCH DAMAGE. |
27 | */ |
28 | |
29 | /* |
30 | * Copyright (c) 2005 Manuel Bouyer. |
31 | * |
32 | * Redistribution and use in source and binary forms, with or without |
33 | * modification, are permitted provided that the following conditions |
34 | * are met: |
35 | * 1. Redistributions of source code must retain the above copyright |
36 | * notice, this list of conditions and the following disclaimer. |
37 | * 2. Redistributions in binary form must reproduce the above copyright |
38 | * notice, this list of conditions and the following disclaimer in the |
39 | * documentation and/or other materials provided with the distribution. |
40 | * |
41 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
42 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
43 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
44 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
45 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
46 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
47 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
48 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
49 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
50 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
51 | * |
52 | */ |
53 | |
54 | /* |
55 | * watch "control/shutdown" and generate sysmon events. |
56 | */ |
57 | |
58 | #include <sys/cdefs.h> |
59 | __KERNEL_RCSID(0, "$NetBSD: shutdown_xenbus.c,v 1.7 2011/09/20 00:12:24 jym Exp $" ); |
60 | |
61 | #include <sys/param.h> |
62 | #include <sys/malloc.h> |
63 | |
64 | #include <dev/sysmon/sysmonvar.h> |
65 | |
66 | #include <xen/xenbus.h> |
67 | #include <xen/shutdown_xenbus.h> |
68 | |
69 | #define SHUTDOWN_PATH "control" |
70 | #define SHUTDOWN_NAME "shutdown" |
71 | |
72 | static struct sysmon_pswitch xenbus_power = { |
73 | .smpsw_type = PSWITCH_TYPE_POWER, |
74 | .smpsw_name = "xenbus" , |
75 | }; |
76 | static struct sysmon_pswitch xenbus_reset = { |
77 | .smpsw_type = PSWITCH_TYPE_RESET, |
78 | .smpsw_name = "xenbus" , |
79 | }; |
80 | static struct sysmon_pswitch xenbus_sleep = { |
81 | .smpsw_type = PSWITCH_TYPE_SLEEP, |
82 | .smpsw_name = "xenbus" , |
83 | }; |
84 | |
85 | static void |
86 | xenbus_shutdown_handler(struct xenbus_watch *watch, const char **vec, |
87 | unsigned int len) |
88 | { |
89 | |
90 | struct xenbus_transaction *xbt; |
91 | int error; |
92 | char *reqstr; |
93 | unsigned int reqstrlen; |
94 | |
95 | again: |
96 | xbt = xenbus_transaction_start(); |
97 | if (xbt == NULL) { |
98 | return; |
99 | } |
100 | error = xenbus_read(xbt, SHUTDOWN_PATH, SHUTDOWN_NAME, |
101 | &reqstrlen, &reqstr); |
102 | if (error) { |
103 | if (error != ENOENT) { |
104 | printf("%s: xenbus_read %d\n" , __func__, error); |
105 | } |
106 | error = xenbus_transaction_end(xbt, 1); |
107 | if (error != 0) { |
108 | printf("%s: xenbus_transaction_end 1 %d\n" , |
109 | __func__, error); |
110 | } |
111 | return; |
112 | } |
113 | KASSERT(strlen(reqstr) == reqstrlen); |
114 | error = xenbus_rm(xbt, SHUTDOWN_PATH, SHUTDOWN_NAME); |
115 | if (error) { |
116 | printf("%s: xenbus_rm %d\n" , __func__, error); |
117 | } |
118 | error = xenbus_transaction_end(xbt, 0); |
119 | if (error == EAGAIN) { |
120 | free(reqstr, M_DEVBUF); |
121 | goto again; |
122 | } |
123 | if (error != 0) { |
124 | printf("%s: xenbus_transaction_end 2 %d\n" , __func__, error); |
125 | } |
126 | if (strcmp(reqstr, "poweroff" ) == 0) { |
127 | sysmon_pswitch_event(&xenbus_power, PSWITCH_EVENT_PRESSED); |
128 | } else if (strcmp(reqstr, "halt" ) == 0) { /* XXX eventually halt without -p */ |
129 | sysmon_pswitch_event(&xenbus_power, PSWITCH_EVENT_PRESSED); |
130 | } else if (strcmp(reqstr, "reboot" ) == 0) { |
131 | sysmon_pswitch_event(&xenbus_reset, PSWITCH_EVENT_PRESSED); |
132 | } else if (strcmp(reqstr, "suspend" ) == 0) { |
133 | xen_suspend_allow = true; |
134 | sysmon_pswitch_event(&xenbus_sleep, PSWITCH_EVENT_PRESSED); |
135 | } else { |
136 | printf("ignore shutdown request: %s\n" , reqstr); |
137 | } |
138 | free(reqstr, M_DEVBUF); |
139 | } |
140 | |
141 | static struct xenbus_watch xenbus_shutdown_watch = { |
142 | .node = __UNCONST(SHUTDOWN_PATH "/" SHUTDOWN_NAME), /* XXX */ |
143 | .xbw_callback = xenbus_shutdown_handler, |
144 | }; |
145 | |
146 | void |
147 | shutdown_xenbus_setup(void) |
148 | { |
149 | xen_suspend_allow = false; |
150 | |
151 | if (sysmon_pswitch_register(&xenbus_power) != 0 || |
152 | sysmon_pswitch_register(&xenbus_reset) != 0 || |
153 | sysmon_pswitch_register(&xenbus_sleep) != 0) { |
154 | aprint_error("%s: unable to register with sysmon\n" , __func__); |
155 | return; |
156 | } |
157 | if (register_xenbus_watch(&xenbus_shutdown_watch)) { |
158 | aprint_error("%s: unable to watch control/shutdown\n" , __func__); |
159 | } |
160 | } |
161 | |