Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Handle extern requests for shutdown, reboot and sysrq |
| 3 | */ |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 4 | |
| 5 | #define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt |
| 6 | |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 7 | #include <linux/kernel.h> |
| 8 | #include <linux/err.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 9 | #include <linux/slab.h> |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 10 | #include <linux/reboot.h> |
| 11 | #include <linux/sysrq.h> |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 12 | #include <linux/stop_machine.h> |
| 13 | #include <linux/freezer.h> |
Rafael J. Wysocki | 19234c0 | 2011-04-20 00:36:11 +0200 | [diff] [blame] | 14 | #include <linux/syscore_ops.h> |
Paul Gortmaker | 63c9744 | 2011-07-10 13:22:07 -0400 | [diff] [blame] | 15 | #include <linux/export.h> |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 16 | |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 17 | #include <xen/xen.h> |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 18 | #include <xen/xenbus.h> |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 19 | #include <xen/grant_table.h> |
| 20 | #include <xen/events.h> |
| 21 | #include <xen/hvc-console.h> |
Julien Grall | a9fd60e | 2015-06-17 15:28:02 +0100 | [diff] [blame] | 22 | #include <xen/page.h> |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 23 | #include <xen/xen-ops.h> |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 24 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 25 | #include <asm/xen/hypercall.h> |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 26 | #include <asm/xen/hypervisor.h> |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 27 | |
| 28 | enum shutdown_state { |
| 29 | SHUTDOWN_INVALID = -1, |
| 30 | SHUTDOWN_POWEROFF = 0, |
| 31 | SHUTDOWN_SUSPEND = 2, |
| 32 | /* Code 3 is SHUTDOWN_CRASH, which we don't use because the domain can only |
| 33 | report a crash, not be instructed to crash! |
| 34 | HALT is the same as POWEROFF, as far as we're concerned. The tools use |
| 35 | the distinction when we return the reason code to them. */ |
| 36 | SHUTDOWN_HALT = 4, |
| 37 | }; |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 38 | |
| 39 | /* Ignore multiple shutdown requests. */ |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 40 | static enum shutdown_state shutting_down = SHUTDOWN_INVALID; |
| 41 | |
Ian Campbell | ceb1802 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 42 | struct suspend_info { |
| 43 | int cancelled; |
| 44 | }; |
| 45 | |
Stanislaw Gruszka | cd97988 | 2014-02-26 11:30:30 +0100 | [diff] [blame] | 46 | static RAW_NOTIFIER_HEAD(xen_resume_notifier); |
| 47 | |
| 48 | void xen_resume_notifier_register(struct notifier_block *nb) |
| 49 | { |
| 50 | raw_notifier_chain_register(&xen_resume_notifier, nb); |
| 51 | } |
| 52 | EXPORT_SYMBOL_GPL(xen_resume_notifier_register); |
| 53 | |
| 54 | void xen_resume_notifier_unregister(struct notifier_block *nb) |
| 55 | { |
| 56 | raw_notifier_chain_unregister(&xen_resume_notifier, nb); |
| 57 | } |
| 58 | EXPORT_SYMBOL_GPL(xen_resume_notifier_unregister); |
| 59 | |
Stefano Stabellini | 65e053a | 2013-06-27 14:28:38 +0100 | [diff] [blame] | 60 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 61 | static int xen_suspend(void *data) |
| 62 | { |
Ian Campbell | ceb1802 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 63 | struct suspend_info *si = data; |
Jeremy Fitzhardinge | 359cdd3 | 2008-05-26 23:31:28 +0100 | [diff] [blame] | 64 | int err; |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 65 | |
| 66 | BUG_ON(!irqs_disabled()); |
| 67 | |
Rafael J. Wysocki | 2e711c0 | 2011-04-26 19:15:07 +0200 | [diff] [blame] | 68 | err = syscore_suspend(); |
Rafael J. Wysocki | 770824b | 2009-02-22 18:38:50 +0100 | [diff] [blame] | 69 | if (err) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 70 | pr_err("%s: system core suspend failed: %d\n", __func__, err); |
Rafael J. Wysocki | 770824b | 2009-02-22 18:38:50 +0100 | [diff] [blame] | 71 | return err; |
| 72 | } |
Jeremy Fitzhardinge | 359cdd3 | 2008-05-26 23:31:28 +0100 | [diff] [blame] | 73 | |
David Vrabel | aa8532c | 2014-05-08 11:09:23 +0100 | [diff] [blame] | 74 | gnttab_suspend(); |
| 75 | xen_arch_pre_suspend(); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 76 | |
| 77 | /* |
| 78 | * This hypercall returns 1 if suspend was cancelled |
| 79 | * or the domain was merely checkpointed, and 0 if it |
| 80 | * is resuming in a new domain. |
| 81 | */ |
David Vrabel | aa8532c | 2014-05-08 11:09:23 +0100 | [diff] [blame] | 82 | si->cancelled = HYPERVISOR_suspend(xen_pv_domain() |
Julien Grall | 0df4f26 | 2015-08-07 17:34:37 +0100 | [diff] [blame] | 83 | ? virt_to_gfn(xen_start_info) |
David Vrabel | aa8532c | 2014-05-08 11:09:23 +0100 | [diff] [blame] | 84 | : 0); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 85 | |
David Vrabel | aa8532c | 2014-05-08 11:09:23 +0100 | [diff] [blame] | 86 | xen_arch_post_suspend(si->cancelled); |
| 87 | gnttab_resume(); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 88 | |
Ian Campbell | ceb1802 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 89 | if (!si->cancelled) { |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 90 | xen_irq_resume(); |
Isaku Yamahata | ad55db9 | 2008-07-08 15:06:32 -0700 | [diff] [blame] | 91 | xen_timer_resume(); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 92 | } |
| 93 | |
Rafael J. Wysocki | 19234c0 | 2011-04-20 00:36:11 +0200 | [diff] [blame] | 94 | syscore_resume(); |
Ian Campbell | 1e6fcf8 | 2009-03-25 17:46:42 +0000 | [diff] [blame] | 95 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | static void do_suspend(void) |
| 100 | { |
| 101 | int err; |
Ian Campbell | ceb1802 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 102 | struct suspend_info si; |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 103 | |
| 104 | shutting_down = SHUTDOWN_SUSPEND; |
| 105 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 106 | err = freeze_processes(); |
| 107 | if (err) { |
Ross Lagerwall | 72978b2 | 2015-01-19 13:19:38 +0000 | [diff] [blame] | 108 | pr_err("%s: freeze processes failed %d\n", __func__, err); |
Tejun Heo | 3fc1f1e | 2010-05-06 18:49:20 +0200 | [diff] [blame] | 109 | goto out; |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 110 | } |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 111 | |
Ross Lagerwall | 72978b2 | 2015-01-19 13:19:38 +0000 | [diff] [blame] | 112 | err = freeze_kernel_threads(); |
| 113 | if (err) { |
| 114 | pr_err("%s: freeze kernel threads failed %d\n", __func__, err); |
| 115 | goto out_thaw; |
| 116 | } |
| 117 | |
Shriram Rajagopalan | b3e96c0 | 2011-02-22 14:59:06 -0800 | [diff] [blame] | 118 | err = dpm_suspend_start(PMSG_FREEZE); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 119 | if (err) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 120 | pr_err("%s: dpm_suspend_start %d\n", __func__, err); |
Ian Campbell | 65f6338 | 2009-12-01 11:47:14 +0000 | [diff] [blame] | 121 | goto out_thaw; |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 122 | } |
| 123 | |
Ian Campbell | c5cae66 | 2009-12-17 13:57:09 +0000 | [diff] [blame] | 124 | printk(KERN_DEBUG "suspending xenstore...\n"); |
| 125 | xs_suspend(); |
| 126 | |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 127 | err = dpm_suspend_end(PMSG_FREEZE); |
Rafael J. Wysocki | 2ed8d2b3 | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 128 | if (err) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 129 | pr_err("dpm_suspend_end failed: %d\n", err); |
Konrad Rzeszutek Wilk | 186bab1 | 2012-04-17 14:35:49 -0400 | [diff] [blame] | 130 | si.cancelled = 0; |
Ian Campbell | 65f6338 | 2009-12-01 11:47:14 +0000 | [diff] [blame] | 131 | goto out_resume; |
Rafael J. Wysocki | 2ed8d2b3 | 2009-03-16 22:34:06 +0100 | [diff] [blame] | 132 | } |
| 133 | |
Boris Ostrovsky | 2b953a5 | 2015-04-28 18:46:20 -0400 | [diff] [blame] | 134 | xen_arch_suspend(); |
| 135 | |
Ian Campbell | ceb1802 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 136 | si.cancelled = 1; |
| 137 | |
Ian Campbell | b056b6a | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 138 | err = stop_machine(xen_suspend, &si, cpumask_of(0)); |
Jeremy Fitzhardinge | 922cc38a | 2009-11-24 09:58:49 -0800 | [diff] [blame] | 139 | |
David Vrabel | 1b64782 | 2014-07-02 17:25:23 +0100 | [diff] [blame] | 140 | /* Resume console as early as possible. */ |
| 141 | if (!si.cancelled) |
| 142 | xen_console_resume(); |
| 143 | |
Stanislaw Gruszka | cd97988 | 2014-02-26 11:30:30 +0100 | [diff] [blame] | 144 | raw_notifier_call_chain(&xen_resume_notifier, 0, NULL); |
| 145 | |
Rafael J. Wysocki | cf579df | 2012-01-29 20:38:29 +0100 | [diff] [blame] | 146 | dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE); |
Jeremy Fitzhardinge | 922cc38a | 2009-11-24 09:58:49 -0800 | [diff] [blame] | 147 | |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 148 | if (err) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 149 | pr_err("failed to start xen_suspend: %d\n", err); |
Ian Campbell | ceb1802 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 150 | si.cancelled = 1; |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 151 | } |
| 152 | |
Boris Ostrovsky | 2b953a5 | 2015-04-28 18:46:20 -0400 | [diff] [blame] | 153 | xen_arch_resume(); |
| 154 | |
Ian Campbell | c5cae66 | 2009-12-17 13:57:09 +0000 | [diff] [blame] | 155 | out_resume: |
Boris Ostrovsky | 2b953a5 | 2015-04-28 18:46:20 -0400 | [diff] [blame] | 156 | if (!si.cancelled) |
Ian Campbell | de5b31b | 2009-02-09 12:05:50 -0800 | [diff] [blame] | 157 | xs_resume(); |
Boris Ostrovsky | 2b953a5 | 2015-04-28 18:46:20 -0400 | [diff] [blame] | 158 | else |
Ian Campbell | de5b31b | 2009-02-09 12:05:50 -0800 | [diff] [blame] | 159 | xs_suspend_cancel(); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 160 | |
Shriram Rajagopalan | b3e96c0 | 2011-02-22 14:59:06 -0800 | [diff] [blame] | 161 | dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 162 | |
Ian Campbell | 65f6338 | 2009-12-01 11:47:14 +0000 | [diff] [blame] | 163 | out_thaw: |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 164 | thaw_processes(); |
Ian Campbell | 65f6338 | 2009-12-01 11:47:14 +0000 | [diff] [blame] | 165 | out: |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 166 | shutting_down = SHUTDOWN_INVALID; |
| 167 | } |
Rafael J. Wysocki | 1f112ce | 2011-04-11 22:54:42 +0200 | [diff] [blame] | 168 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 169 | |
Ian Campbell | 5527172 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 170 | struct shutdown_handler { |
Juergen Gross | 44b3c7a | 2016-10-11 13:34:16 +0200 | [diff] [blame] | 171 | #define SHUTDOWN_CMD_SIZE 11 |
| 172 | const char command[SHUTDOWN_CMD_SIZE]; |
| 173 | bool flag; |
Ian Campbell | 5527172 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 174 | void (*cb)(void); |
| 175 | }; |
| 176 | |
Konrad Rzeszutek Wilk | eb47f71 | 2014-04-04 14:53:41 -0400 | [diff] [blame] | 177 | static int poweroff_nb(struct notifier_block *cb, unsigned long code, void *unused) |
| 178 | { |
| 179 | switch (code) { |
| 180 | case SYS_DOWN: |
| 181 | case SYS_HALT: |
| 182 | case SYS_POWER_OFF: |
| 183 | shutting_down = SHUTDOWN_POWEROFF; |
| 184 | default: |
| 185 | break; |
| 186 | } |
| 187 | return NOTIFY_DONE; |
| 188 | } |
Ian Campbell | 5527172 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 189 | static void do_poweroff(void) |
| 190 | { |
Konrad Rzeszutek Wilk | eb47f71 | 2014-04-04 14:53:41 -0400 | [diff] [blame] | 191 | switch (system_state) { |
| 192 | case SYSTEM_BOOTING: |
| 193 | orderly_poweroff(true); |
| 194 | break; |
| 195 | case SYSTEM_RUNNING: |
| 196 | orderly_poweroff(false); |
| 197 | break; |
| 198 | default: |
| 199 | /* Don't do it when we are halting/rebooting. */ |
| 200 | pr_info("Ignoring Xen toolstack shutdown.\n"); |
| 201 | break; |
| 202 | } |
Ian Campbell | 5527172 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | static void do_reboot(void) |
| 206 | { |
| 207 | shutting_down = SHUTDOWN_POWEROFF; /* ? */ |
| 208 | ctrl_alt_del(); |
| 209 | } |
| 210 | |
Juergen Gross | 44b3c7a | 2016-10-11 13:34:16 +0200 | [diff] [blame] | 211 | static struct shutdown_handler shutdown_handlers[] = { |
| 212 | { "poweroff", true, do_poweroff }, |
| 213 | { "halt", false, do_poweroff }, |
| 214 | { "reboot", true, do_reboot }, |
| 215 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
| 216 | { "suspend", true, do_suspend }, |
| 217 | #endif |
| 218 | }; |
| 219 | |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 220 | static void shutdown_handler(struct xenbus_watch *watch, |
Juergen Gross | 5584ea2 | 2017-02-09 14:39:57 +0100 | [diff] [blame] | 221 | const char *path, const char *token) |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 222 | { |
| 223 | char *str; |
| 224 | struct xenbus_transaction xbt; |
| 225 | int err; |
Juergen Gross | 44b3c7a | 2016-10-11 13:34:16 +0200 | [diff] [blame] | 226 | int idx; |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 227 | |
| 228 | if (shutting_down != SHUTDOWN_INVALID) |
| 229 | return; |
| 230 | |
| 231 | again: |
| 232 | err = xenbus_transaction_start(&xbt); |
| 233 | if (err) |
| 234 | return; |
| 235 | |
| 236 | str = (char *)xenbus_read(xbt, "control", "shutdown", NULL); |
| 237 | /* Ignore read errors and empty reads. */ |
| 238 | if (XENBUS_IS_ERR_READ(str)) { |
| 239 | xenbus_transaction_end(xbt, 1); |
| 240 | return; |
| 241 | } |
| 242 | |
Juergen Gross | 44b3c7a | 2016-10-11 13:34:16 +0200 | [diff] [blame] | 243 | for (idx = 0; idx < ARRAY_SIZE(shutdown_handlers); idx++) { |
| 244 | if (strcmp(str, shutdown_handlers[idx].command) == 0) |
Ian Campbell | 5527172 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 245 | break; |
| 246 | } |
| 247 | |
| 248 | /* Only acknowledge commands which we are prepared to handle. */ |
Juergen Gross | 44b3c7a | 2016-10-11 13:34:16 +0200 | [diff] [blame] | 249 | if (idx < ARRAY_SIZE(shutdown_handlers)) |
Ian Campbell | 5527172 | 2011-02-17 11:04:20 +0000 | [diff] [blame] | 250 | xenbus_write(xbt, "control", "shutdown", ""); |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 251 | |
| 252 | err = xenbus_transaction_end(xbt, 0); |
| 253 | if (err == -EAGAIN) { |
| 254 | kfree(str); |
| 255 | goto again; |
| 256 | } |
| 257 | |
Juergen Gross | 44b3c7a | 2016-10-11 13:34:16 +0200 | [diff] [blame] | 258 | if (idx < ARRAY_SIZE(shutdown_handlers)) { |
| 259 | shutdown_handlers[idx].cb(); |
Jeremy Fitzhardinge | 0e91398 | 2008-05-26 23:31:27 +0100 | [diff] [blame] | 260 | } else { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 261 | pr_info("Ignoring shutdown request: %s\n", str); |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 262 | shutting_down = SHUTDOWN_INVALID; |
| 263 | } |
| 264 | |
| 265 | kfree(str); |
| 266 | } |
| 267 | |
Randy Dunlap | f3bc318 | 2010-05-24 14:33:41 -0700 | [diff] [blame] | 268 | #ifdef CONFIG_MAGIC_SYSRQ |
Juergen Gross | 5584ea2 | 2017-02-09 14:39:57 +0100 | [diff] [blame] | 269 | static void sysrq_handler(struct xenbus_watch *watch, const char *path, |
| 270 | const char *token) |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 271 | { |
| 272 | char sysrq_key = '\0'; |
| 273 | struct xenbus_transaction xbt; |
| 274 | int err; |
| 275 | |
| 276 | again: |
| 277 | err = xenbus_transaction_start(&xbt); |
| 278 | if (err) |
| 279 | return; |
Jan Beulich | 4fed1b1 | 2017-02-03 01:54:05 -0700 | [diff] [blame] | 280 | if (xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key) < 0) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 281 | pr_err("Unable to read sysrq code in control/sysrq\n"); |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 282 | xenbus_transaction_end(xbt, 1); |
| 283 | return; |
| 284 | } |
| 285 | |
| 286 | if (sysrq_key != '\0') |
| 287 | xenbus_printf(xbt, "control", "sysrq", "%c", '\0'); |
| 288 | |
| 289 | err = xenbus_transaction_end(xbt, 0); |
| 290 | if (err == -EAGAIN) |
| 291 | goto again; |
| 292 | |
| 293 | if (sysrq_key != '\0') |
Dmitry Torokhov | f335397 | 2010-08-17 21:15:47 -0700 | [diff] [blame] | 294 | handle_sysrq(sysrq_key); |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 295 | } |
| 296 | |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 297 | static struct xenbus_watch sysrq_watch = { |
| 298 | .node = "control/sysrq", |
| 299 | .callback = sysrq_handler |
| 300 | }; |
Randy Dunlap | f3bc318 | 2010-05-24 14:33:41 -0700 | [diff] [blame] | 301 | #endif |
| 302 | |
| 303 | static struct xenbus_watch shutdown_watch = { |
| 304 | .node = "control/shutdown", |
| 305 | .callback = shutdown_handler |
| 306 | }; |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 307 | |
Konrad Rzeszutek Wilk | eb47f71 | 2014-04-04 14:53:41 -0400 | [diff] [blame] | 308 | static struct notifier_block xen_reboot_nb = { |
| 309 | .notifier_call = poweroff_nb, |
| 310 | }; |
| 311 | |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 312 | static int setup_shutdown_watcher(void) |
| 313 | { |
| 314 | int err; |
Juergen Gross | 44b3c7a | 2016-10-11 13:34:16 +0200 | [diff] [blame] | 315 | int idx; |
| 316 | #define FEATURE_PATH_SIZE (SHUTDOWN_CMD_SIZE + sizeof("feature-")) |
| 317 | char node[FEATURE_PATH_SIZE]; |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 318 | |
| 319 | err = register_xenbus_watch(&shutdown_watch); |
| 320 | if (err) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 321 | pr_err("Failed to set shutdown watcher\n"); |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 322 | return err; |
| 323 | } |
| 324 | |
Konrad Rzeszutek Wilk | eb47f71 | 2014-04-04 14:53:41 -0400 | [diff] [blame] | 325 | |
Randy Dunlap | f3bc318 | 2010-05-24 14:33:41 -0700 | [diff] [blame] | 326 | #ifdef CONFIG_MAGIC_SYSRQ |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 327 | err = register_xenbus_watch(&sysrq_watch); |
| 328 | if (err) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 329 | pr_err("Failed to set sysrq watcher\n"); |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 330 | return err; |
| 331 | } |
Randy Dunlap | f3bc318 | 2010-05-24 14:33:41 -0700 | [diff] [blame] | 332 | #endif |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 333 | |
Juergen Gross | 44b3c7a | 2016-10-11 13:34:16 +0200 | [diff] [blame] | 334 | for (idx = 0; idx < ARRAY_SIZE(shutdown_handlers); idx++) { |
| 335 | if (!shutdown_handlers[idx].flag) |
| 336 | continue; |
| 337 | snprintf(node, FEATURE_PATH_SIZE, "feature-%s", |
| 338 | shutdown_handlers[idx].command); |
| 339 | xenbus_printf(XBT_NIL, "control", node, "%u", 1); |
| 340 | } |
| 341 | |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | static int shutdown_event(struct notifier_block *notifier, |
| 346 | unsigned long event, |
| 347 | void *data) |
| 348 | { |
| 349 | setup_shutdown_watcher(); |
| 350 | return NOTIFY_DONE; |
| 351 | } |
| 352 | |
Stefano Stabellini | 016b6f5 | 2010-05-14 12:45:07 +0100 | [diff] [blame] | 353 | int xen_setup_shutdown_event(void) |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 354 | { |
| 355 | static struct notifier_block xenstore_notifier = { |
| 356 | .notifier_call = shutdown_event |
| 357 | }; |
Stefano Stabellini | 702d4eb9 | 2010-12-02 17:54:50 +0000 | [diff] [blame] | 358 | |
| 359 | if (!xen_domain()) |
| 360 | return -ENODEV; |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 361 | register_xenstore_notifier(&xenstore_notifier); |
Konrad Rzeszutek Wilk | eb47f71 | 2014-04-04 14:53:41 -0400 | [diff] [blame] | 362 | register_reboot_notifier(&xen_reboot_nb); |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 363 | |
| 364 | return 0; |
| 365 | } |
Stefano Stabellini | 183d03c | 2010-05-17 17:08:21 +0100 | [diff] [blame] | 366 | EXPORT_SYMBOL_GPL(xen_setup_shutdown_event); |
Jeremy Fitzhardinge | 3e2b8fb | 2007-07-17 18:37:07 -0700 | [diff] [blame] | 367 | |
Stefano Stabellini | 702d4eb9 | 2010-12-02 17:54:50 +0000 | [diff] [blame] | 368 | subsys_initcall(xen_setup_shutdown_event); |