*/
#include <linux/kernel.h>
#include <linux/err.h>
+#include <linux/slab.h>
#include <linux/reboot.h>
#include <linux/sysrq.h>
+#include <linux/stop_machine.h>
+#include <linux/freezer.h>
#include <xen/xenbus.h>
+#include <xen/grant_table.h>
+#include <xen/events.h>
+#include <xen/hvc-console.h>
+#include <xen/xen-ops.h>
-#define SHUTDOWN_INVALID -1
-#define SHUTDOWN_POWEROFF 0
-#define SHUTDOWN_SUSPEND 2
-/* Code 3 is SHUTDOWN_CRASH, which we don't use because the domain can only
- * report a crash, not be instructed to crash!
- * HALT is the same as POWEROFF, as far as we're concerned. The tools use
- * the distinction when we return the reason code to them.
- */
-#define SHUTDOWN_HALT 4
+#include <asm/xen/hypercall.h>
+#include <asm/xen/page.h>
+
+enum shutdown_state {
+ SHUTDOWN_INVALID = -1,
+ SHUTDOWN_POWEROFF = 0,
+ SHUTDOWN_SUSPEND = 2,
+ /* Code 3 is SHUTDOWN_CRASH, which we don't use because the domain can only
+ report a crash, not be instructed to crash!
+ HALT is the same as POWEROFF, as far as we're concerned. The tools use
+ the distinction when we return the reason code to them. */
+ SHUTDOWN_HALT = 4,
+};
/* Ignore multiple shutdown requests. */
-static int shutting_down = SHUTDOWN_INVALID;
+static enum shutdown_state shutting_down = SHUTDOWN_INVALID;
+
+#ifdef CONFIG_PM_SLEEP
+static int xen_suspend(void *data)
+{
+ int *cancelled = data;
+ int err;
+
+ BUG_ON(!irqs_disabled());
+
+ err = sysdev_suspend(PMSG_SUSPEND);
+ if (err) {
+ printk(KERN_ERR "xen_suspend: sysdev_suspend failed: %d\n",
+ err);
+ return err;
+ }
+
+ xen_mm_pin_all();
+ gnttab_suspend();
+ xen_pre_suspend();
+
+ /*
+ * This hypercall returns 1 if suspend was cancelled
+ * or the domain was merely checkpointed, and 0 if it
+ * is resuming in a new domain.
+ */
+ *cancelled = HYPERVISOR_suspend(virt_to_mfn(xen_start_info));
+
+ xen_post_suspend(*cancelled);
+ gnttab_resume();
+ xen_mm_unpin_all();
+
+ if (!*cancelled) {
+ xen_irq_resume();
+ xen_console_resume();
+ xen_timer_resume();
+ }
+
+ sysdev_resume();
+
+ return 0;
+}
+
+static void do_suspend(void)
+{
+ int err;
+ int cancelled = 1;
+
+ shutting_down = SHUTDOWN_SUSPEND;
+
+#ifdef CONFIG_PREEMPT
+ /* If the kernel is preemptible, we need to freeze all the processes
+ to prevent them from being in the middle of a pagetable update
+ during suspend. */
+ err = freeze_processes();
+ if (err) {
+ printk(KERN_ERR "xen suspend: freeze failed %d\n", err);
+ goto out;
+ }
+#endif
+
+ err = dpm_suspend_start(PMSG_SUSPEND);
+ if (err) {
+ printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err);
+ goto out_thaw;
+ }
+
+ printk(KERN_DEBUG "suspending xenstore...\n");
+ xs_suspend();
+
+ err = dpm_suspend_noirq(PMSG_SUSPEND);
+ if (err) {
+ printk(KERN_ERR "dpm_suspend_noirq failed: %d\n", err);
+ goto out_resume;
+ }
+
+ err = stop_machine(xen_suspend, &cancelled, cpumask_of(0));
+
+ dpm_resume_noirq(PMSG_RESUME);
+
+ if (err) {
+ printk(KERN_ERR "failed to start xen_suspend: %d\n", err);
+ cancelled = 1;
+ }
+
+out_resume:
+ if (!cancelled) {
+ xen_arch_resume();
+ xs_resume();
+ } else
+ xs_suspend_cancel();
+
+ dpm_resume_end(PMSG_RESUME);
+
+ /* Make sure timer events get retriggered on all CPUs */
+ clock_was_set();
+
+out_thaw:
+#ifdef CONFIG_PREEMPT
+ thaw_processes();
+out:
+#endif
+ shutting_down = SHUTDOWN_INVALID;
+}
+#endif /* CONFIG_PM_SLEEP */
static void shutdown_handler(struct xenbus_watch *watch,
const char **vec, unsigned int len)
}
if (strcmp(str, "poweroff") == 0 ||
- strcmp(str, "halt") == 0)
+ strcmp(str, "halt") == 0) {
+ shutting_down = SHUTDOWN_POWEROFF;
orderly_poweroff(false);
- else if (strcmp(str, "reboot") == 0)
+ } else if (strcmp(str, "reboot") == 0) {
+ shutting_down = SHUTDOWN_POWEROFF; /* ? */
ctrl_alt_del();
- else {
+#ifdef CONFIG_PM_SLEEP
+ } else if (strcmp(str, "suspend") == 0) {
+ do_suspend();
+#endif
+ } else {
printk(KERN_INFO "Ignoring shutdown request: %s\n", str);
shutting_down = SHUTDOWN_INVALID;
}
kfree(str);
}
+#ifdef CONFIG_MAGIC_SYSRQ
static void sysrq_handler(struct xenbus_watch *watch, const char **vec,
unsigned int len)
{
handle_sysrq(sysrq_key, NULL);
}
-static struct xenbus_watch shutdown_watch = {
- .node = "control/shutdown",
- .callback = shutdown_handler
-};
-
static struct xenbus_watch sysrq_watch = {
.node = "control/sysrq",
.callback = sysrq_handler
};
+#endif
+
+static struct xenbus_watch shutdown_watch = {
+ .node = "control/shutdown",
+ .callback = shutdown_handler
+};
static int setup_shutdown_watcher(void)
{
return err;
}
+#ifdef CONFIG_MAGIC_SYSRQ
err = register_xenbus_watch(&sysrq_watch);
if (err) {
printk(KERN_ERR "Failed to set sysrq watcher\n");
return err;
}
+#endif
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff