add sensors to export what the actual size of the balloon is and what it

should be, in bytes.
currently uses SENSOR_INTEGER as sensor type, this may change in the future in
favor of a new sensor type.

ok sf@

1 files changed, 24 insertions, 1 deletions

diff --git a/sys/dev/pci/viomb.c b/sys/dev/pci/viomb.c
index e0b477ae6f4..ac24f4ee2ef 100644
--- a/sys/dev/pci/viomb.c
+++ b/sys/dev/pci/viomb.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: viomb.c,v 1.9 2014/07/09 22:45:26 jasper Exp $	 */
+/* $OpenBSD: viomb.c,v 1.10 2014/07/11 08:48:38 jasper Exp $	 */
 /* $NetBSD: viomb.c,v 1.1 2011/10/30 12:12:21 hannken Exp $	 */
 
 /*
@@ -33,6 +33,7 @@
 #include <sys/device.h>
 #include <sys/task.h>
 #include <sys/pool.h>
+#include <sys/sensors.h>
 
 #include <uvm/uvm_extern.h>
 
@@ -99,6 +100,8 @@ struct viomb_softc {
 	struct taskq		*sc_taskq;
 	struct task		sc_task;
 	struct pglist		sc_balloon_pages;
+	struct ksensor		sc_sens[2];
+	struct ksensordev	sc_sensdev;
 };
 
 int	viomb_match(struct device *, void *, void *);
@@ -204,6 +207,22 @@ viomb_attach(struct device *parent, struct device *self, void *aux)
 		goto err_dmamap;
 	task_set(&sc->sc_task, viomb_worker, sc, NULL);
 
+	strlcpy(sc->sc_sensdev.xname, DEVNAME(sc),
+	    sizeof(sc->sc_sensdev.xname));
+	strlcpy(sc->sc_sens[0].desc, "desired",
+	    sizeof(sc->sc_sens[0].desc));
+	sc->sc_sens[0].type = SENSOR_INTEGER;
+	sensor_attach(&sc->sc_sensdev, &sc->sc_sens[0]);
+	sc->sc_sens[0].value = sc->sc_npages << PAGE_SHIFT;
+
+	strlcpy(sc->sc_sens[1].desc, "current",
+	    sizeof(sc->sc_sens[1].desc));
+	sc->sc_sens[1].type = SENSOR_INTEGER;
+	sensor_attach(&sc->sc_sensdev, &sc->sc_sens[1]);
+	sc->sc_sens[1].value = sc->sc_actual << PAGE_SHIFT;
+
+	sensordev_install(&sc->sc_sensdev);
+
 	printf("\n");
 	return;
 err_dmamap:
@@ -249,6 +268,10 @@ viomb_worker(void *arg1, void *arg2)
 			   sc->sc_actual, sc->sc_npages);
 		viomb_deflate(sc);
 	}
+
+	sc->sc_sens[0].value = sc->sc_npages << PAGE_SHIFT;
+	sc->sc_sens[1].value = sc->sc_actual << PAGE_SHIFT;
+
 	splx(s);
 }