Add support for "control/shutdown" power management facility

At the moment only "poweroff" and "reboot" actions are supported.
Suspend/resume requires additional changes.

1 files changed, 54 insertions, 2 deletions

diff --git a/sys/dev/pv/xen.c b/sys/dev/pv/xen.c
index 3cc0d964910..8aa7565cba8 100644
--- a/sys/dev/pv/xen.c
+++ b/sys/dev/pv/xen.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: xen.c,v 1.47 2016/01/29 19:04:30 mikeb Exp $	*/
+/*	$OpenBSD: xen.c,v 1.48 2016/01/29 19:12:26 mikeb Exp $	*/
 
 /*
  * Copyright (c) 2015 Mike Belopuhov
@@ -18,6 +18,9 @@
 
 #include <sys/param.h>
 #include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/signal.h>
+#include <sys/signalvar.h>
 #include <sys/malloc.h>
 #include <sys/kernel.h>
 #include <sys/device.h>
@@ -66,6 +69,7 @@ void	xen_disable_emulated_devices(struct xen_softc *);
 int 	xen_match(struct device *, void *, void *);
 void	xen_attach(struct device *, struct device *, void *);
 void	xen_deferred(struct device *);
+void	xen_control(void *);
 void	xen_resume(struct device *);
 int	xen_activate(struct device *, int);
 int	xen_probe_devices(struct xen_softc *);
@@ -153,7 +157,6 @@ xen_attach(struct device *parent, struct device *self, void *aux)
 	if (xs_attach(sc))
 		return;
 
-
 	xen_probe_devices(sc);
 
 	/* pvbus(4) key/value interface */
@@ -177,6 +180,55 @@ xen_deferred(struct device *self)
 	}
 
 	xen_intr_enable();
+
+	if (xs_watch(sc, "control", "shutdown", &sc->sc_ctltsk,
+	    xen_control, sc))
+		printf("%s: failed to setup shutdown control watch\n",
+		    sc->sc_dev.dv_xname);
+}
+
+void
+xen_control(void *arg)
+{
+	struct xen_softc *sc = arg;
+	struct xs_transaction xst;
+	char action[128];
+
+	memset(&xst, 0, sizeof(xst));
+	xst.xst_id = 0;
+	xst.xst_sc = sc->sc_xs;
+
+	if (xs_getprop(sc, "control", "shutdown", action, sizeof(action))) {
+		printf("%s: failed to process control event\n",
+		    sc->sc_dev.dv_xname);
+		return;
+	}
+
+	if (strlen(action) == 0)
+		return;
+
+	if (strcmp(action, "halt") == 0 || strcmp(action, "poweroff") == 0) {
+		extern int allowpowerdown;
+
+		if (allowpowerdown == 1) {
+			allowpowerdown = 0;
+			prsignal(initprocess, SIGUSR2);
+		}
+	} else if (strcmp(action, "reboot") == 0) {
+		extern int allowpowerdown;
+
+		if (allowpowerdown == 1) {
+			allowpowerdown = 0;
+			prsignal(initprocess, SIGINT);
+		}
+	} else if (strcmp(action, "crash") == 0) {
+		panic("xen told us to do this");
+	} else if (strcmp(action, "suspend") == 0) {
+		/* Not implemented yet */
+	} else {
+		printf("%s: unknown shutdown event \"%s\"\n",
+		    sc->sc_dev.dv_xname, action);
+	}
 }
 
 void