cam: Set the CAM_QOS_VALID when valid

When the elapsed time of the operation is complete and stored in the QOS
field, set the CAM_QOS_VALID bit.  In iosched, test to make sure it's
set before using it.

Sponsored by:		Netflix

sys/cam/cam_iosched.c

@@ -1685,7 +1685,8 @@ cam_iosched_bio_complete(struct cam_iosched_softc *isc, struct bio *bp,
 			printf("Completing command with bio_cmd == %#x\n", bp->bio_cmd);
 	}
 
-	if (!(bp->bio_flags & BIO_ERROR) && done_ccb != NULL) {
+	if ((bp->bio_flags & BIO_ERROR) == 0 && done_ccb != NULL &&
+	    (done_ccb->ccb_h.status & CAM_QOS_VALID) != 0) {
 		sbintime_t sim_latency;
 		
 		sim_latency = cam_iosched_sbintime_t(done_ccb->ccb_h.qos.periph_data);

sys/cam/cam_xpt.c

@@ -4617,6 +4617,7 @@ xpt_done(union ccb *done_ccb)
 
 	/* Store the time the ccb was in the sim */
 	done_ccb->ccb_h.qos.periph_data = cam_iosched_delta_t(done_ccb->ccb_h.qos.periph_data);
+	done_ccb->ccb_h.status |= CAM_QOS_VALID;
 	hash = (u_int)(done_ccb->ccb_h.path_id + done_ccb->ccb_h.target_id +
 	    done_ccb->ccb_h.target_lun) % cam_num_doneqs;
 	queue = &cam_doneqs[hash];