2 files changed, 11 insertions, 5 deletions

diff --git a/include/uapi/linux/bsg.h b/include/uapi/linux/bsg.h
index 7a12e1c0f371..02986cf8b6f1 100644
--- a/include/uapi/linux/bsg.h
+++ b/include/uapi/linux/bsg.h
@@ -10,12 +10,13 @@
 #define BSG_SUB_PROTOCOL_SCSI_TRANSPORT 2
 
 /*
- * For flags member below
- * sg.h sg_io_hdr also has bits defined for it's flags member. However
- * none of these bits are implemented/used by bsg. The bits below are
- * allocated to not conflict with sg.h ones anyway.
+ * For flag constants below:
+ * sg.h sg_io_hdr also has bits defined for it's flags member. These
+ * two flag values (0x10 and 0x20) have the same meaning in sg.h . For
+ * bsg the BSG_FLAG_Q_AT_HEAD flag is ignored since it is the deafult.
  */
-#define BSG_FLAG_Q_AT_TAIL 0x10 /* default, == 0 at this bit, is Q_AT_HEAD */
+#define BSG_FLAG_Q_AT_TAIL 0x10 /* default is Q_AT_HEAD */
+#define BSG_FLAG_Q_AT_HEAD 0x20
 
 struct sg_io_v4 {
         __s32 guard;            /* [i] 'Q' to differentiate from v3 */
diff --git a/include/uapi/linux/virtio_blk.h b/include/uapi/linux/virtio_blk.h
index 6d8e61c48563..9ad67b267584 100644
--- a/include/uapi/linux/virtio_blk.h
+++ b/include/uapi/linux/virtio_blk.h
@@ -40,6 +40,7 @@
 #define VIRTIO_BLK_F_WCE        9       /* Writeback mode enabled after reset */
 #define VIRTIO_BLK_F_TOPOLOGY   10      /* Topology information is available */
 #define VIRTIO_BLK_F_CONFIG_WCE 11      /* Writeback mode available in config */
+#define VIRTIO_BLK_F_MQ         12      /* support more than one vq */
 
 #ifndef __KERNEL__
 /* Old (deprecated) name for VIRTIO_BLK_F_WCE. */
@@ -77,6 +78,10 @@ struct virtio_blk_config {
 
         /* writeback mode (if VIRTIO_BLK_F_CONFIG_WCE) */
         __u8 wce;
+        __u8 unused;
+
+        /* number of vqs, only available when VIRTIO_BLK_F_MQ is set */
+        __u16 num_queues;
 } __attribute__((packed));
 
 /*