staging: virthba driver to access shared SCSI hba

The virthba module provides access to a shared SCSI host bus adapter
and one or more disk devices, by proxying SCSI commands between the
guest and the service partition that owns the shared SCSI adapter,
using a channel between the guest and the service partition. The disks
that appear on the shared bus are defined by the s-Par configuration
and enforced by the service partition, while the guest driver handles
sending commands and handling responses. Each disk is shared as a
whole to a guest. Sharing the bus adapter in this way provides
resiliency; should the device encounter an error, only the service
partition is rebooted, and the device is reinitialized. This allows
guests to continue running and to recover from the error.

Signed-off-by: Ken Cox <jkc@redhat.com>
Cc: Ben Romer <sparmaintainer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/Kconfig

@@ -15,5 +15,6 @@ source "drivers/staging/unisys/visorchipset/Kconfig"
 source "drivers/staging/unisys/channels/Kconfig"
 source "drivers/staging/unisys/uislib/Kconfig"
 source "drivers/staging/unisys/virtpci/Kconfig"
+source "drivers/staging/unisys/virthba/Kconfig"
 
 endif # UNISYSSPAR

drivers/staging/unisys/Makefile

@@ -7,3 +7,4 @@ obj-$(CONFIG_UNISYS_VISORCHIPSET)	+= visorchipset/
 obj-$(CONFIG_UNISYS_CHANNELSTUB)	+= channels/
 obj-$(CONFIG_UNISYS_UISLIB)		+= uislib/
 obj-$(CONFIG_UNISYS_VIRTPCI)		+= virtpci/
+obj-$(CONFIG_UNISYS_VIRTHBA)		+= virthba/

drivers/staging/unisys/virthba/Kconfig

@@ -0,0 +1,10 @@
+#
+# Unisys virthba configuration
+#
+
+config UNISYS_VIRTHBA
+	tristate "Unisys virthba driver"
+	depends on UNISYSSPAR && UNISYS_VISORCHIPSET && UNISYS_CHANNELSTUB && UNISYS_UISLIB && UNISYS_VIRTPCI
+	---help---
+	If you say Y here, you will enable the Unisys virthba driver.
+

drivers/staging/unisys/virthba/Makefile

@@ -0,0 +1,16 @@
+#
+# Makefile for Unisys virthba
+#
+
+obj-$(CONFIG_UNISYS_VIRTHBA)	+= virthba.o
+
+ccflags-y += -Idrivers/staging/unisys/include
+ccflags-y += -Idrivers/staging/unisys/uislib
+ccflags-y += -Idrivers/staging/unisys/timskmod
+ccflags-y += -Idrivers/staging/unisys/visorchipset
+ccflags-y += -Idrivers/staging/unisys/virtpci
+ccflags-y += -Idrivers/staging/unisys/common-spar/include
+ccflags-y += -Idrivers/staging/unisys/common-spar/include/channels
+
+ccflags-y += -DCONFIG_SPAR_GUEST -DGUESTDRIVERBUILD -DNOAUTOVERSION
+

drivers/staging/unisys/virthba/virthba.h

@@ -0,0 +1,31 @@
+/* virthba.h
+ *
+ * Copyright © 2010 - 2013 UNISYS CORPORATION
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ */
+
+/*
+ * Unisys Virtual HBA driver header
+ */
+
+
+
+#ifndef __VIRTHBA_H__
+#define __VIRTHBA_H__
+
+
+#define VIRTHBA_VERSION "01.00"
+
+
+#endif /* __VIRTHBA_H__ */