Pass through some new block device features.

MFC after:	1 month

2 files changed, 30 insertions, 5 deletions

diff --git a/sys/dev/xen/blkfront/blkfront.c b/sys/dev/xen/blkfront/blkfront.c
index d35e04a..ef36b94 100644
--- a/sys/dev/xen/blkfront/blkfront.c
+++ b/sys/dev/xen/blkfront/blkfront.c
@@ -855,6 +855,20 @@ xbd_feature_string(struct xbd_softc *sc, char *features, size_t len)
 		feature_cnt++;
 	}
 
+	if ((sc->xbd_flags & XBDF_DISCARD) != 0) {
+		if (feature_cnt != 0)
+			sbuf_printf(&sb, ", ");
+		sbuf_printf(&sb, "discard");
+		feature_cnt++;
+	}
+
+	if ((sc->xbd_flags & XBDF_PERSISTENT) != 0) {
+		if (feature_cnt != 0)
+			sbuf_printf(&sb, ", ");
+		sbuf_printf(&sb, "persistent_grants");
+		feature_cnt++;
+	}
+
 	(void) sbuf_finish(&sb);
 	return (sbuf_len(&sb));
 }
@@ -985,7 +999,8 @@ xbd_vdevice_to_unit(uint32_t vdevice, int *unit, const char **name)
 
 int
 xbd_instance_create(struct xbd_softc *sc, blkif_sector_t sectors,
-    int vdevice, uint16_t vdisk_info, unsigned long sector_size)
+    int vdevice, uint16_t vdisk_info, unsigned long sector_size,
+    unsigned long phys_sector_size)
 {
 	char features[80];
 	int unit, error = 0;
@@ -1013,6 +1028,8 @@ xbd_instance_create(struct xbd_softc *sc, blkif_sector_t sectors,
 	sc->xbd_disk->d_name = name;
 	sc->xbd_disk->d_drv1 = sc;
 	sc->xbd_disk->d_sectorsize = sector_size;
+	sc->xbd_disk->d_stripesize = phys_sector_size;
+	sc->xbd_disk->d_stripeoffset = 0;
 
 	sc->xbd_disk->d_mediasize = sectors * sector_size;
 	sc->xbd_disk->d_maxsize = sc->xbd_max_request_size;
@@ -1206,7 +1223,7 @@ static void
 xbd_connect(struct xbd_softc *sc)
 {
 	device_t dev = sc->xbd_dev;
-	unsigned long sectors, sector_size;
+	unsigned long sectors, sector_size, phys_sector_size;
 	unsigned int binfo;
 	int err, feature_barrier, feature_flush;
 	int i, j;
@@ -1229,6 +1246,11 @@ xbd_connect(struct xbd_softc *sc)
 		return;
 	}
 	err = xs_gather(XST_NIL, xenbus_get_otherend_path(dev),
+	     "physical-sector-size", "%lu", &phys_sector_size,
+	     NULL);
+	if (err || phys_sector_size <= sector_size)
+		phys_sector_size = 0;
+	err = xs_gather(XST_NIL, xenbus_get_otherend_path(dev),
 	     "feature-barrier", "%lu", &feature_barrier,
 	     NULL);
 	if (err == 0 && feature_barrier != 0)
@@ -1330,7 +1352,7 @@ xbd_connect(struct xbd_softc *sc)
 		bus_print_child_footer(device_get_parent(dev), dev);
 
 		xbd_instance_create(sc, sectors, sc->xbd_vdevice, binfo,
-		    sector_size);
+		    sector_size, phys_sector_size);
 	}
 
 	(void)xenbus_set_state(dev, XenbusStateConnected); 
diff --git a/sys/dev/xen/blkfront/block.h b/sys/dev/xen/blkfront/block.h
index 28c6ff2..ddb4088 100644
--- a/sys/dev/xen/blkfront/block.h
+++ b/sys/dev/xen/blkfront/block.h
@@ -159,10 +159,12 @@ typedef enum {
 	XBDF_READY	  = 1 << 3, /* Is ready */
 	XBDF_CM_SHORTAGE  = 1 << 4, /* Free cm resource shortage active. */
 	XBDF_GNT_SHORTAGE = 1 << 5, /* Grant ref resource shortage active */
-	XBDF_WAIT_IDLE	  = 1 << 6  /*
+	XBDF_WAIT_IDLE	  = 1 << 6,  /*
 				     * No new work until oustanding work
 				     * completes.
 				     */
+	XBDF_DISCARD	  = 1 << 7, /* backend supports discard */
+	XBDF_PERSISTENT	  = 1 << 8  /* backend supports persistent grants */
 } xbd_flag_t;
 
 /*
@@ -200,7 +202,8 @@ struct xbd_softc {
 };
 
 int xbd_instance_create(struct xbd_softc *, blkif_sector_t sectors, int device,
-			uint16_t vdisk_info, unsigned long sector_size);
+			uint16_t vdisk_info, unsigned long sector_size,
+			unsigned long phys_sector_size);
 
 static inline void
 xbd_added_qentry(struct xbd_softc *sc, xbd_q_index_t index)