Add SCSI passthrough support to CISS. This allows devices like tape drives

that are on a CISS bus to be exported up to CAM and made available as normal
devices.  This will typically add one or two buses to CAM, which will be
numbered starting at 32 to allow room for CISS proxy buses.  Also, the CISS
firmware usually hides disk devices, but these can also be exposed as 'pass'
devices if you set the hw.ciss.expose_hidden_physical tunable.

Sponsored by:	Tape Laboratories, Inc.
MFC After: 3 days

1 files changed, 19 insertions, 0 deletions

diff --git a/sys/dev/ciss/cissvar.h b/sys/dev/ciss/cissvar.h
index b1bdd42..5657ea0 100644
--- a/sys/dev/ciss/cissvar.h
+++ b/sys/dev/ciss/cissvar.h
@@ -167,6 +167,22 @@ struct ciss_ldrive
 };
 
 /*
+ * Per-physical-drive data
+ */
+struct ciss_pdrive
+{
+    union ciss_device_address	cp_address;
+    int				cp_online;
+};
+
+#define CISS_PHYSICAL_SHIFT	5
+#define CISS_PHYSICAL_BASE	(1 << CISS_PHYSICAL_SHIFT)
+#define CISS_MAX_PHYSTGT	15
+
+#define CISS_IS_PHYSICAL(bus)	(bus >= CISS_PHYSICAL_BASE)
+#define CISS_CAM_TO_PBUS(bus)	(bus - CISS_PHYSICAL_BASE)
+
+/*
  * Per-adapter data
  */
 struct ciss_softc
@@ -212,8 +228,11 @@ struct ciss_softc
     struct ciss_request		*ciss_periodic_notify;	/* notify callback request */
 
     struct ciss_ldrive		**ciss_logical;
+    struct ciss_pdrive		**ciss_physical;
     union ciss_device_address	*ciss_controllers;	/* controller address */
     int				ciss_max_bus_number;	/* maximum bus number */
+    int				ciss_max_logical_bus;
+    int				ciss_max_physical_bus;
 
     struct cam_devq		*ciss_cam_devq;
     struct cam_sim		**ciss_cam_sim;