[PATCH v2] staging: Remove the drivers for the Unisys s-Par

[Fabio M. De Francesco]

The Unisys sub-tree contains three drivers for the "Unisys Secure Partition"
(s-Par(R)): visorhba, visorinput, visornic.

They have no maintainers, in fact the only one that is listed in MAINTAINERS
has an unreacheable email address. During 2021 and 2022 several patches have
been submitted to these drivers but nobody at Unisys cared of reviewing the
changes. Probably, also the "sparmaintainer" internal list of unisys.com is
not anymore read by interested Unisys' engineers.

Therefore, remove the ./unisys subdirectory and delete the relevant entries
in the MAINTAINERS, Kconfig, Makefile files.

Cc: David Kershner <david.kershner@xxxxxxxxxx>
Cc: sparmaintainer@xxxxxxxxxx
Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@xxxxxxxxx>
---

v1->v2: Add two "Cc:" lines, one to David Kershner and the second to the
"sparmaintainer" list at unisys.com, as requested by Greg Kroah-Hartman.

 MAINTAINERS                                   |    8 -
 drivers/staging/Kconfig                       |    2 -
 drivers/staging/Makefile                      |    1 -
 .../ABI/sysfs-platform-visorchipset           |   89 -
 .../staging/unisys/Documentation/overview.txt |  337 ---
 drivers/staging/unisys/Kconfig                |   16 -
 drivers/staging/unisys/MAINTAINERS            |    5 -
 drivers/staging/unisys/Makefile               |    7 -
 drivers/staging/unisys/TODO                   |   16 -
 drivers/staging/unisys/include/iochannel.h    |  571 -----
 drivers/staging/unisys/visorhba/Kconfig       |   15 -
 drivers/staging/unisys/visorhba/Makefile      |   10 -
 .../staging/unisys/visorhba/visorhba_main.c   | 1142 ---------
 drivers/staging/unisys/visorinput/Kconfig     |   16 -
 drivers/staging/unisys/visorinput/Makefile    |    7 -
 .../staging/unisys/visorinput/visorinput.c    |  788 ------
 drivers/staging/unisys/visornic/Kconfig       |   16 -
 drivers/staging/unisys/visornic/Makefile      |   10 -
 .../staging/unisys/visornic/visornic_main.c   | 2131 -----------------
 19 files changed, 5187 deletions(-)
 delete mode 100644 drivers/staging/unisys/Documentation/ABI/sysfs-platform-visorchipset
 delete mode 100644 drivers/staging/unisys/Documentation/overview.txt
 delete mode 100644 drivers/staging/unisys/Kconfig
 delete mode 100644 drivers/staging/unisys/MAINTAINERS
 delete mode 100644 drivers/staging/unisys/Makefile
 delete mode 100644 drivers/staging/unisys/TODO
 delete mode 100644 drivers/staging/unisys/include/iochannel.h
 delete mode 100644 drivers/staging/unisys/visorhba/Kconfig
 delete mode 100644 drivers/staging/unisys/visorhba/Makefile
 delete mode 100644 drivers/staging/unisys/visorhba/visorhba_main.c
 delete mode 100644 drivers/staging/unisys/visorinput/Kconfig
 delete mode 100644 drivers/staging/unisys/visorinput/Makefile
 delete mode 100644 drivers/staging/unisys/visorinput/visorinput.c
 delete mode 100644 drivers/staging/unisys/visornic/Kconfig
 delete mode 100644 drivers/staging/unisys/visornic/Makefile
 delete mode 100644 drivers/staging/unisys/visornic/visornic_main.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 3ed62dcd144e..a62da6d0f943 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20183,14 +20183,6 @@ F:	drivers/cdrom/cdrom.c
 F:	include/linux/cdrom.h
 F:	include/uapi/linux/cdrom.h
 
-UNISYS S-PAR DRIVERS
-M:	David Kershner <david.kershner@xxxxxxxxxx>
-L:	sparmaintainer@xxxxxxxxxx (Unisys internal)
-S:	Supported
-F:	drivers/staging/unisys/
-F:	drivers/visorbus/
-F:	include/linux/visorbus.h
-
 UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER
 R:	Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
 R:	Avri Altman <avri.altman@xxxxxxx>
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index fc274737053d..a4d9f39dde90 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -64,8 +64,6 @@ source "drivers/staging/gdm724x/Kconfig"
 
 source "drivers/staging/fwserial/Kconfig"
 
-source "drivers/staging/unisys/Kconfig"
-
 source "drivers/staging/clocking-wizard/Kconfig"
 
 source "drivers/staging/fbtft/Kconfig"
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 65e317922e3f..a17a2aeaceba 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -22,7 +22,6 @@ obj-$(CONFIG_MFD_NVEC)		+= nvec/
 obj-$(CONFIG_STAGING_BOARD)	+= board/
 obj-$(CONFIG_LTE_GDM724X)	+= gdm724x/
 obj-$(CONFIG_FIREWIRE_SERIAL)	+= fwserial/
-obj-$(CONFIG_UNISYSSPAR)	+= unisys/
 obj-$(CONFIG_COMMON_CLK_XLNX_CLKWZRD)	+= clocking-wizard/
 obj-$(CONFIG_FB_TFT)		+= fbtft/
 obj-$(CONFIG_MOST)		+= most/
diff --git a/drivers/staging/unisys/Documentation/ABI/sysfs-platform-visorchipset b/drivers/staging/unisys/Documentation/ABI/sysfs-platform-visorchipset
deleted file mode 100644
index c2359de17eaf..000000000000
--- a/drivers/staging/unisys/Documentation/ABI/sysfs-platform-visorchipset
+++ /dev/null
@@ -1,89 +0,0 @@
-This file describes sysfs entries beneath /devices/platform/visorchipset.
-
-What:		install/error
-Date:		7/18/2014
-KernelVersion: 	TBD
-Contact:	sparmaintainer@xxxxxxxxxx
-Description:	used to send the ID of a string that should be displayed on
-		s-Par's automatic installation progress screen when an error
-		is encountered during installation. This field has no effect
-		if not in installation mode.
-Users:		sparmaintainer@xxxxxxxxxx
-
-What:		install/remainingsteps
-Date:		7/18/2014
-KernelVersion: 	TBD
-Contact:	sparmaintainer@xxxxxxxxxx
-Description:	used to set the value of the progress bar on the s-Par automatic
-		installation progress screen. This field has no effect if not in
-		installation mode.
-Users:		sparmaintainer@xxxxxxxxxx
-
-What:		install/textid
-Date:		7/18/2014
-KernelVersion: 	TBD
-Contact:	sparmaintainer@xxxxxxxxxx
-Description:	used to send the ID of a string that should be displayed on
-		s-Par's automatic installation progress screen. Setting this
-		field when not in installation mode (boottotool was set on
-		the previous guest boot) has no effect.
-Users:		sparmaintainer@xxxxxxxxxx
-
-What:		install/boottotool
-Date:		7/18/2014
-KernelVersion: 	TBD
-Contact:	sparmaintainer@xxxxxxxxxx
-Description:	The boottotool flag controls s-Par behavior on the next boot of
-		this guest. Setting the flag will cause the guest to boot from
-		the utility and installation image, which will use the value in
-		the toolaction field to determine what operation is being
-		requested.
-Users:		sparmaintainer@xxxxxxxxxx
-
-What:		install/toolaction
-Date:		7/18/2014
-KernelVersion: 	TBD
-Contact:	sparmaintainer@xxxxxxxxxx
-Description:	This field is used to tell s-Par which type of recovery tool
-		action to perform on the next guest boot-up. The meaning of the
-		value is dependent on the type of installation software used to
-		commission the guest.
-Users:		sparmaintainer@xxxxxxxxxx
-
-What:		parahotplug/deviceenabled
-Date:		7/18/2014
-KernelVersion: 	TBD
-Contact:	sparmaintainer@xxxxxxxxxx
-Description:	This entry is used by a Unisys support script installed on the
-		guest, and triggered by a udev event. The support script is
-		responsible for enabling and disabling SR-IOV devices when the
-		PF device is being recovered in another guest.
-
-		Some SR-IOV devices have problems when the PF is reset without
-		first disabling all VFs attached to that PF. s-Par handles this
-		situation by sending a message to guests using these VFs, and
-		the script will disable the device. When the PF is recovered,
-		another message is sent to the guests to re-enable the VFs.
-
-		The parahotplug/deviceenabled interface is used to acknowledge
-		the recovery message.
-Users:		sparmaintainer@xxxxxxxxxx
-
-What:		parahotplug/devicedisabled
-Date:		7/18/2014
-KernelVersion: 	TBD
-Contact:	sparmaintainer@xxxxxxxxxx
-Description:	This entry is used by a Unisys support script installed on the
-		guest, and triggered by a udev event. The support script is
-		responsible for enabling and disabling SR-IOV devices when the
-		PF device is being recovered in another guest.
-
-		Some SR-IOV devices have problems when the PF is reset without
-		first disabling all VFs attached to that PF. s-Par handles this
-		situation by sending a message to guests using these VFs, and
-		the script will disable the device. When the PF is recovered,
-		another message is sent to the guests to re-enable the VFs.
-
-		The parahotplug/devicedisaabled interface is used to acknowledge
-		the initial recovery message.
-Users:		sparmaintainer@xxxxxxxxxx
diff --git a/drivers/staging/unisys/Documentation/overview.txt b/drivers/staging/unisys/Documentation/overview.txt
deleted file mode 100644
index cf29f884cbe0..000000000000
--- a/drivers/staging/unisys/Documentation/overview.txt
+++ /dev/null
@@ -1,337 +0,0 @@
-1. Overview
------------
-
-This document describes the driver set for Unisys Secure Partitioning
-(s-Par(R)).
-
-s-Par is firmware that provides hardware partitioning capabilities for
-splitting large-scale Intel x86 servers into multiple isolated
-partitions. s-Par provides a set of para-virtualized device drivers to
-allow guest partitions on the same server to share devices that would
-normally be unsharable, specifically:
-
-* visornic - network interface
-* visorhba - scsi disk adapter
-* visorinput - keyboard and mouse
-
-These drivers conform to the standard Linux bus/device model described
-within Documentation/driver-api/driver-model/, and utilize a driver named
-visorbus to present the virtual busses involved. Drivers in the 'visor*'
-driver set are commonly referred to as "guest drivers" or "client drivers".
-All drivers except visorbus expose a device of a specific usable class to the
-Linux guest environment (e.g., block, network, or input), and are collectively
-referred to as "function drivers".
-
-The back-end for each device is owned and managed by a small,
-single-purpose service partition in the s-Par firmware, which communicates
-with each guest partition sharing that device through an area of shared memory
-called a "channel". In s-Par nomenclature, the back-end is often referred to
-as the "service partition", "IO partition" (for virtual network and scsi disk
-devices), or "console partition" (for virtual keyboard and mouse devices).
-
-Each virtual device requires exactly 1 dedicated channel, which the guest
-driver and back-end use to communicate.  The hypervisor need not intervene
-(other than normal interrupt handling) in the interactions that occur across
-this channel.
-
-NOT covered in this document:
-
-* s-Par also supports sharing physical PCI adapters via SR-IOV, but
-  because this requires no specific support in the guest partitions, it will
-  not be discussed in this document.  Shared SR-IOV devices should be used
-  wherever possible for highest performance.
-
-* Because the s-Par back-end provides a standard EFI framebuffer to each
-  guest, the already-existing efifb Linux driver is used to provide guest
-  video access. Thus, the only s-Par-unique support that is necessary to
-  provide a guest graphics console are for keyboard and mouse (via visorinput).
-
-
-2. Driver Descriptions
-----------------------
-
-2.1. visorbus
--------------
-
-2.1.1. Overview
----------------
-
-The visorbus driver handles the virtual busses on which all of the virtual
-devices reside. It provides a registration function named
-visorbus_register_visor_driver() that is called by each of the function
-drivers at initialization time, which the function driver uses to tell
-visorbus about the device classes (via specifying a list of device type
-GUIDs) it wants to handle. For use by function drivers, visorbus provides
-implementation for struct visor_driver and struct visor_device, as well
-as utility functions for communicating with the back-end.
-
-visorbus is associated with ACPI id "PNP0A07" in modules.alias, so if built
-as a module it will typically be loaded automatically via standard udev or
-systemd (God help us) configurations.
-
-visorbus can similarly force auto-loading of function drivers for virtual
-devices it discovers, as it includes a MODALIAS environment variable of this
-form in the hotplug uevent environment when each virtual device is
-discovered:
-
-    visorbus:<device type GUID>
-
-visorbus notifies each function driver when a device of its registered class
-arrives and departs, by calling the function driver's probe() and remove()
-methods.
-
-The actual struct device objects that correspond to each virtual bus and
-each virtual device are created and owned by visorbus.  These device objects
-are created in response to messages from the s-Par back-end received on a
-special control channel called the "controlvm channel" (each guest partition
-has access to exactly 1 controlvm channel), and have a lifetime that is
-independent of the function drivers that control them.
-
-2.1.2. "struct visor device" Function Driver Interfaces
--------------------------------------------------------
-
-The interface between visorbus and its function drivers is defined in
-visorbus.h, and described below.
-
-When a visor function driver loads, it calls visorbus_register_visor_driver()
-to register itself with visorbus. The significant information passed in this
-exchange is as follows:
-
-* the GUID(s) of the channel type(s) that are handled by this driver, as
-  well as a "friendly name" identifying each (this will be published under
-  /sys/devices/visorbus<x>/dev<y>)
-
-* the addresses of callback functions to be called whenever a virtual
-  device/channel with the appropriate channel-type GUID(s) appears or
-  disappears
-
-* the address of a "channel_interrupt" function, which will be automatically
-  called at specific intervals to enable the driver to poll the device
-  channel for activity
-
-The following functions implemented within each function driver will be
-called automatically by the visorbus driver at appropriate times:
-
-* The probe() function notifies about the creation of each new virtual
-  device/channel instance.
-
-* The remove() function notifies about the destruction of a virtual
-  device/channel instance.
-
-* The channel_interrupt() function is called at frequent intervals to
-  give the function driver an opportunity to poll the virtual device channel
-  for requests.  Information is passed to this function to enable the
-  function driver to use the visorchannel_signalinsert() and
-  visorchannel_signalremove() functions to respond to and initiate activity
-  over the channel.  (Note that since it is the visorbus driver that
-  determines when this is called, it is very easy to switch to
-  interrupt-driven mechanisms when available for particular virtual device
-  types.)
-
-* The pause() function is called should it ever be necessary to direct the
-  function driver to temporarily stop accessing the device channel.  An
-  example of when this is needed is when the service partition implementing
-  the back-end of the virtual device needs to be recovered.  After a
-  successful return of pause(), the function driver must not access the
-  device channel until a subsequent resume() occurs.
-
-* The resume() function is the "book-end" to pause(), and is described above.
-
-2.1.3. sysfs Advertised Information
------------------------------------
-
-Because visorbus is a standard Linux bus driver in the model described in
-Documentation/driver-api/driver-model/, the hierarchy of s-Par virtual devices is
-published in the sysfs tree beneath /bus/visorbus/, e.g.,
-/sys/bus/visorbus/devices/ might look like:
-
-    vbus1:dev1 -> ../../../devices/visorbus1/vbus1:dev1
-    vbus1:dev2 -> ../../../devices/visorbus1/vbus1:dev2
-    vbus1:dev3 -> ../../../devices/visorbus1/vbus1:dev3
-    vbus2:dev0 -> ../../../devices/visorbus2/vbus2:dev0
-    vbus2:dev1 -> ../../../devices/visorbus2/vbus2:dev1
-    vbus2:dev2 -> ../../../devices/visorbus2/vbus2:dev2
-    visorbus1 -> ../../../devices/visorbus1
-    visorbus2 -> ../../../devices/visorbus2
-
-visor_device notes:
-
-* Each visorbus<n> entry denotes the existence of a struct visor_device
-  denoting virtual bus #<n>.  A unique s-Par channel exists for each such
-  virtual bus.
-
-* Virtual bus numbers uniquely identify s-Par back-end service partitions.
-  In this example, bus 1 corresponds to the s-Par console partition
-  (controls keyboard, video, and mouse), whereas bus 2 corresponds to the
-  s-Par IO partition (controls network and disk).
-
-* Each vbus<x>:dev<y> entry denotes the existence of a struct visor_device
-  denoting virtual device #<y> outboard of virtual bus #<x>.  A unique s-Par
-  channel exists for each such virtual device.
-
-* If a function driver has loaded and claimed a particular device, the
-  bus/visorbus/devices/vbus<x>:dev<y>/driver symlink will indicate that
-  function driver.
-
-Every active visorbus device will have a sysfs subtree under:
-
-    /sys/devices/visorbus<x>/vbus<x>:dev<y>/
-
-The following files exist under /sys/devices/visorbus<x>/vbus<x>:dev<y>:
-
-    subsystem                 link to sysfs tree that describes the
-                              visorbus bus type; e.g.:
-                                  ../../../bus/visorbus
-
-    driver                    link to sysfs tree that describes the
-                              function driver controlling this device;
-                              e.g.:
-                                  ../../../bus/visorbus/drivers/visorhba
-                              Note that this "driver" link will not exist
-                              if the appropriate function driver has not
-                              been loaded yet.
-
-    channel                   properties of the device channel (all in
-                              ascii text format)
-
-        clientpartition       handle identifying the guest (client) side
-                              of this channel, e.g. 0x10000000.
-
-        nbytes                total size of this channel in bytes
-
-        physaddr              the guest physical address for the base of
-                              the channel
-
-        typeguid              a GUID identifying the channel type, in
-                              xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx notation
-
-        typename              a "friendly name" for this channel type, e.g.,
-                              "keyboard".  Note that this name is provided by
-                              a particular function driver, so "typename"
-                              will return an empty string until AFTER the
-                              appropriate function driver controlling this
-                              channel type is loaded
-
-        zoneguid              a GUID identifying the channel zone, in
-                              xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx notation
-
-
-2.2. visorhba
--------------
-
-The visorhba driver registers with visorbus as the function driver to
-handle virtual scsi disk devices, specified using the
-VISOR_VHBA_CHANNEL_GUID type in the visorbus_register_visor_driver()
-call. visorhba uses scsi_add_host() to expose a Linux block device
-(e.g., /sys/block/) in the guest environment for each s-Par virtual device.
-
-visorhba 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.
-
-When compiled as a module, visorhba can be autoloaded by visorbus in
-standard udev/systemd environments, as it includes the modules.alias
-definition:
-
-    "visorbus:"+VISOR_VHBA_CHANNEL_GUID_STR
-
-i.e.:
-
-    alias visorbus:414815ed-c58c-11da-95a9-00e08161165f visorhba
-
-
-2.3. visornic
--------------
-
-The visornic driver registers with visorbus as the function driver to
-handle virtual network devices, specified using the
-VISOR_VNIC_CHANNEL_GUID type in the visorbus_register_visor_driver()
-call. visornic uses register_netdev() to expose a Linux device of class net
-(e.g., /sys/class/net/) in the guest environment for each s-Par virtual
-device.
-
-visornic provides a paravirtualized network interface to a
-guest by proxying buffer information between the guest and the service
-partition that owns the shared network interface, using a channel
-between the guest and the service partition. The connectivity of this
-interface with the shared interface and possibly other guest
-partitions is defined by the s-Par configuration and enforced by the
-service partition; the guest driver handles communication and link
-status.
-
-When compiled as a module, visornic can be autoloaded by visorbus in
-standard udev/systemd environments, as it includes the modules.alias
-definition:
-
-    "visorbus:"+VISOR_VNIC_CHANNEL_GUID_STR
-
-i.e.:
-
-    alias visorbus:8cd5994d-c58e-11da-95a9-00e08161165f visornic
-
-
-2.4. visorinput
----------------
-
-The visorinput driver registers with visorbus as the function driver to
-handle human input devices, specified using the
-VISOR_KEYBOARD_CHANNEL_GUID and VISOR_MOUSE_CHANNEL_GUID
-types in the visorbus_register_visor_driver() call. visorinput uses
-input_register_device() to expose devices of class input
-(e.g., /sys/class/input/) for virtual keyboard and virtual mouse devices.
-A s-Par virtual keyboard device maps 1-to-1 with a Linux input device
-named "visor Keyboard", while a s-Par virtual mouse device has 2 Linux input
-devices created for it: 1 named "visor Wheel", and 1 named "visor Mouse".
-
-By registering as input class devices, modern versions of X will
-automatically find and properly use s-Par virtual keyboard and mouse devices.
-As the s-Par back-end reports keyboard and mouse activity via events on the
-virtual device channel, the visorinput driver delivers the activity to the
-Linux environment by calling input_report_key() and input_report_abs().
-
-You can interact with the guest console using the usyscon Partition Desktop
-(a.k.a., "pd") application, provided as part of s-Par.  After installing the
-usyscon Partition Desktop into a Linux environment via the
-usyscon_partitiondesktop-*.rpm, or into a Windows environment via
-PartitionDesktop.msi, you will be able to launch a console for your guest
-Linux environment by clicking the console icon in the s-Par web UI.
-
-When compiled as a module, visorinput can be autoloaded by visorbus in
-standard udev/systemd environments, as it includes the modules.alias
-definition:
-
-    "visorbus:"+VISOR_MOUSE_CHANNEL_GUID_STR
-    "visorbus:"+VISOR_KEYBOARD_CHANNEL_GUID_STR
-
-i.e.:
-
-    alias visorbus:c73416d0-b0b8-44af-b304-9d2ae99f1b3d visorinput
-    alias visorbus:addf07d4-94a9-46e2-81c3-61abcdbdbd87 visorinput
-
-
-3. Minimum Required Driver Set
-------------------------------
-
-visorbus is required for every Linux guest running under s-Par.
-
-visorhba is typically required for a Linux guest running under s-Par, as it
-is required if your guest boot disk is a virtual device provided by the s-Par
-back-end, which is the default configuration.  However, for advanced
-configurations where the Linux guest boots via an SR-IOV-provided HBA or
-SAN disk for example, visorhba is not technically required.
-
-visornic is typically required for a Linux guest running under s-Par, as it
-is required if your guest network interface is a virtual device provided by
-the s-Par back-end, which is the default configuration.  However, for
-configurations where the Linux guest is provided with an SR-IOV NIC
-for example, visornic is not technically required.
-
-visorinput is only required for a Linux guest running under s-Par if you
-require graphics-mode access to your guest console.
diff --git a/drivers/staging/unisys/Kconfig b/drivers/staging/unisys/Kconfig
deleted file mode 100644
index 43fe1ce538e1..000000000000
--- a/drivers/staging/unisys/Kconfig
+++ /dev/null
@@ -1,16 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Unisys SPAR driver configuration
-#
-menuconfig UNISYSSPAR
-	bool "Unisys SPAR driver support"
-	help
-	  Support for the Unisys SPAR drivers
-
-if UNISYSSPAR
-
-source "drivers/staging/unisys/visornic/Kconfig"
-source "drivers/staging/unisys/visorinput/Kconfig"
-source "drivers/staging/unisys/visorhba/Kconfig"
-
-endif # UNISYSSPAR
diff --git a/drivers/staging/unisys/MAINTAINERS b/drivers/staging/unisys/MAINTAINERS
deleted file mode 100644
index aaddc619c329..000000000000
--- a/drivers/staging/unisys/MAINTAINERS
+++ /dev/null
@@ -1,5 +0,0 @@
-Unisys s-Par drivers
-M:	David Kershner <sparmaintainer@xxxxxxxxxx>
-S:	Maintained
-F:	drivers/staging/unisys/Documentation/overview.txt
-F:	drivers/staging/unisys/
diff --git a/drivers/staging/unisys/Makefile b/drivers/staging/unisys/Makefile
deleted file mode 100644
index c0f76cc196a6..000000000000
--- a/drivers/staging/unisys/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for Unisys SPAR drivers
-#
-obj-$(CONFIG_UNISYS_VISORNIC)		+= visornic/
-obj-$(CONFIG_UNISYS_VISORINPUT)		+= visorinput/
-obj-$(CONFIG_UNISYS_VISORHBA)		+= visorhba/
diff --git a/drivers/staging/unisys/TODO b/drivers/staging/unisys/TODO
deleted file mode 100644
index d863f266bf76..000000000000
--- a/drivers/staging/unisys/TODO
+++ /dev/null
@@ -1,16 +0,0 @@
-TODO:
-	- enhance visornic to use channel_interrupt() hook instead of a
-	  kernel thread
-	- enhance visorhba to use channel_interrupt() hook instead of a
-	  kernel thread
-	- teach visorbus to handle virtual interrupts triggered by s-Par
-	  back-end, and call function driver's channel_interrupt() function
-	  when they occur
-	- enhance debugfs interfaces (e.g., per device, etc.)
-	- upgrade/remove deprecated workqueue operations
-	- move individual drivers into proper driver subsystems
-
-Patches to:
-	Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
-	Ken Cox <jkc@xxxxxxxxxx>
-	Unisys s-Par maintainer mailing list <sparmaintainer@xxxxxxxxxx>
diff --git a/drivers/staging/unisys/include/iochannel.h b/drivers/staging/unisys/include/iochannel.h
deleted file mode 100644
index 9ef812c0bc42..000000000000
--- a/drivers/staging/unisys/include/iochannel.h
+++ /dev/null
@@ -1,571 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * Copyright (C) 2010 - 2016 UNISYS CORPORATION
- * All rights reserved.
- */
-
-#ifndef __IOCHANNEL_H__
-#define __IOCHANNEL_H__
-
-/*
- * Everything needed for IOPart-GuestPart communication is define in
- * this file. Note: Everything is OS-independent because this file is
- * used by Windows, Linux and possible EFI drivers.
- *
- * Communication flow between the IOPart and GuestPart uses the channel headers
- * channel state. The following states are currently being used:
- *       UNINIT(All Zeroes), CHANNEL_ATTACHING, CHANNEL_ATTACHED, CHANNEL_OPENED
- *
- * Additional states will be used later. No locking is needed to switch between
- * states due to the following rules:
- *
- *      1.  IOPart is only the only partition allowed to change from UNIT
- *      2.  IOPart is only the only partition allowed to change from
- *		CHANNEL_ATTACHING
- *      3.  GuestPart is only the only partition allowed to change from
- *		CHANNEL_ATTACHED
- *
- * The state changes are the following: IOPart sees the channel is in UNINIT,
- *        UNINIT -> CHANNEL_ATTACHING (performed only by IOPart)
- *        CHANNEL_ATTACHING -> CHANNEL_ATTACHED (performed only by IOPart)
- *        CHANNEL_ATTACHED -> CHANNEL_OPENED (performed only by GuestPart)
- */
-
-#include <linux/uuid.h>
-#include <linux/skbuff.h>
-#include <linux/visorbus.h>
-
-/*
- * Must increment these whenever you insert or delete fields within this channel
- * struct. Also increment whenever you change the meaning of fields within this
- * channel struct so as to break pre-existing software. Note that you can
- * usually add fields to the END of the channel struct without needing to
- * increment this.
- */
-#define VISOR_VHBA_CHANNEL_VERSIONID 2
-#define VISOR_VNIC_CHANNEL_VERSIONID 2
-
-/*
- * Everything necessary to handle SCSI & NIC traffic between Guest Partition and
- * IO Partition is defined below.
- */
-
-/*
- * Define the two queues per data channel between iopart and ioguestparts.
- *	IOCHAN_TO_IOPART -- used by guest to 'insert' signals to iopart.
- *	IOCHAN_FROM_IOPART -- used by guest to 'remove' signals from IO part.
- */
-#define IOCHAN_TO_IOPART 0
-#define IOCHAN_FROM_IOPART 1
-
-/* Size of cdb - i.e., SCSI cmnd */
-#define MAX_CMND_SIZE 16
-
-/* Unisys-specific DMA direction values */
-enum uis_dma_data_direction {
-	UIS_DMA_BIDIRECTIONAL = 0,
-	UIS_DMA_TO_DEVICE = 1,
-	UIS_DMA_FROM_DEVICE = 2,
-	UIS_DMA_NONE = 3
-};
-
-#define MAX_SENSE_SIZE 64
-#define MAX_PHYS_INFO 64
-
-/*
- * enum net_types - Various types of network packets that can be sent in cmdrsp.
- * @NET_RCV_POST:	Submit buffer to hold receiving incoming packet.
- * @NET_RCV:		visornic -> uisnic. Incoming packet received.
- * @NET_XMIT:		uisnic -> visornic. For outgoing packet.
- * @NET_XMIT_DONE:	visornic -> uisnic. Outgoing packet xmitted.
- * @NET_RCV_ENBDIS:	uisnic -> visornic. Enable/Disable packet reception.
- * @NET_RCV_ENBDIS_ACK:	visornic -> uisnic. Acknowledge enable/disable packet.
- * @NET_RCV_PROMISC:	uisnic -> visornic. Enable/Disable promiscuous mode.
- * @NET_CONNECT_STATUS:	visornic -> uisnic. Indicate the loss or restoration of
- *			a network connection.
- * @NET_MACADDR:	uisnic -> visornic. Indicates the client has requested
- *			to update it's MAC address.
- * @NET_MACADDR_ACK:	MAC address acknowledge.
- */
-enum net_types {
-	NET_RCV_POST = 0,
-	NET_RCV,
-	NET_XMIT,
-	NET_XMIT_DONE,
-	NET_RCV_ENBDIS,
-	NET_RCV_ENBDIS_ACK,
-	/* Reception */
-	NET_RCV_PROMISC,
-	NET_CONNECT_STATUS,
-	NET_MACADDR,
-	NET_MACADDR_ACK,
-};
-
-/* Minimum eth data size */
-#define ETH_MIN_DATA_SIZE 46
-#define ETH_MIN_PACKET_SIZE (ETH_HLEN + ETH_MIN_DATA_SIZE)
-
-/* Maximum data size */
-#define VISOR_ETH_MAX_MTU 16384
-
-#ifndef MAX_MACADDR_LEN
-/* Number of bytes in MAC address */
-#define MAX_MACADDR_LEN 6
-#endif
-
-/* Various types of scsi task mgmt commands. */
-enum task_mgmt_types {
-	TASK_MGMT_ABORT_TASK = 1,
-	TASK_MGMT_BUS_RESET,
-	TASK_MGMT_LUN_RESET,
-	TASK_MGMT_TARGET_RESET,
-};
-
-/* Various types of vdisk mgmt commands. */
-enum vdisk_mgmt_types {
-	VDISK_MGMT_ACQUIRE = 1,
-	VDISK_MGMT_RELEASE,
-};
-
-struct phys_info {
-	u64 pi_pfn;
-	u16 pi_off;
-	u16 pi_len;
-} __packed;
-
-#define MIN_NUMSIGNALS 64
-
-/* Structs with pragma pack. */
-
-struct guest_phys_info {
-	u64 address;
-	u64 length;
-} __packed;
-
-/*
- * struct uisscsi_dest
- * @channel: Bus number.
- * @id:      Target number.
- * @lun:     Logical unit number.
- */
-struct uisscsi_dest {
-	u32 channel;
-	u32 id;
-	u32 lun;
-} __packed;
-
-struct vhba_wwnn {
-	u32 wwnn1;
-	u32 wwnn2;
-} __packed;
-
-/*
- * struct vhba_config_max
- * @max_channel: Maximum channel for devices attached to this bus.
- * @max_id:	 Maximum SCSI ID for devices attached to bus.
- * @max_lun:	 Maximum SCSI LUN for devices attached to bus.
- * @cmd_per_lun: Maximum number of outstanding commands per LUN.
- * @max_io_size: Maximum io size for devices attached to this bus. Max io size
- *		 is often determined by the resource of the hba.
- *		 e.g Max scatter gather list length * page size / sector size.
- *
- * WARNING: Values stored in this structure must contain maximum counts (not
- * maximum values).
- *
- * 20 bytes
- */
-struct vhba_config_max {
-	u32 max_channel;
-	u32 max_id;
-	u32 max_lun;
-	u32 cmd_per_lun;
-	u32 max_io_size;
-} __packed;
-
-/*
- * struct uiscmdrsp_scsi
- *
- * @handle:		The handle to the cmd that was received. Send it back as
- *			is in the rsp packet.
- * @cmnd:		The cdb for the command.
- * @bufflen:		Length of data to be transferred out or in.
- * @guest_phys_entries:	Number of entries in scatter-gather list.
- * @struct gpi_list:	Physical address information for each fragment.
- * @data_dir:		Direction of the data, if any.
- * @struct vdest:	Identifies the virtual hba, id, channel, lun to which
- *			cmd was sent.
- * @linuxstat:		Original Linux status used by Linux vdisk.
- * @scsistat:		The scsi status.
- * @addlstat:		Non-scsi status.
- * @sensebuf:		Sense info in case cmd failed. sensebuf holds the
- *			sense_data struct. See sense_data struct for more
- *			details.
- * @*vdisk:		Pointer to the vdisk to clean up when IO completes.
- * @no_disk_result:	Used to return no disk inquiry result when
- *			no_disk_result is set to 1
- *			scsi.scsistat is SAM_STAT_GOOD
- *			scsi.addlstat is 0
- *			scsi.linuxstat is SAM_STAT_GOOD
- *			That is, there is NO error.
- */
-struct uiscmdrsp_scsi {
-	u64 handle;
-	u8 cmnd[MAX_CMND_SIZE];
-	u32 bufflen;
-	u16 guest_phys_entries;
-	struct guest_phys_info gpi_list[MAX_PHYS_INFO];
-	u32 data_dir;
-	struct uisscsi_dest vdest;
-	/* Needed to queue the rsp back to cmd originator. */
-	int linuxstat;
-	u8 scsistat;
-	u8 addlstat;
-#define ADDL_SEL_TIMEOUT 4
-	/* The following fields are need to determine the result of command. */
-	u8 sensebuf[MAX_SENSE_SIZE];
-	void *vdisk;
-	int no_disk_result;
-} __packed;
-
-/*
- * Defines to support sending correct inquiry result when no disk is
- * configured.
- *
- * From SCSI SPC2 -
- *
- * If the target is not capable of supporting a device on this logical unit, the
- * device server shall set this field to 7Fh (PERIPHERAL QUALIFIER set to 011b
- * and PERIPHERAL DEVICE TYPE set to 1Fh).
- *
- * The device server is capable of supporting the specified peripheral device
- * type on this logical unit. However, the physical device is not currently
- * connected to this logical unit.
- */
-
-/*
- * Peripheral qualifier of 0x3
- * Peripheral type of 0x1f
- * Specifies no device but target present
- */
-#define DEV_NOT_CAPABLE 0x7f
-/*
- * Peripheral qualifier of 0x1
- * Peripheral type of 0 - disk
- * Specifies device capable, but not present
- */
-#define DEV_DISK_CAPABLE_NOT_PRESENT 0x20
-/* HiSup = 1; shows support for report luns must be returned for lun 0. */
-#define DEV_HISUPPORT 0x10
-
-/*
- * Peripheral qualifier of 0x3
- * Peripheral type of 0x1f
- * Specifies no device but target present
- */
-#define DEV_NOT_CAPABLE 0x7f
-/*
- * Peripheral qualifier of 0x1
- * Peripheral type of 0 - disk
- * Specifies device capable, but not present
- */
-#define DEV_DISK_CAPABLE_NOT_PRESENT 0x20
-/* HiSup = 1; shows support for report luns must be returned for lun 0. */
-#define DEV_HISUPPORT 0x10
-
-/*
- * NOTE: Linux code assumes inquiry contains 36 bytes. Without checking length
- * in buf[4] some Linux code accesses bytes beyond 5 to retrieve vendor, product
- * and revision. Yikes! So let us always send back 36 bytes, the minimum for
- * inquiry result.
- */
-#define NO_DISK_INQUIRY_RESULT_LEN 36
-/* 5 bytes minimum for inquiry result */
-#define MIN_INQUIRY_RESULT_LEN 5
-
-/* SCSI device version for no disk inquiry result */
-/* indicates SCSI SPC2 (SPC3 is 5) */
-#define SCSI_SPC2_VER 4
-
-/* Struct and Defines to support sense information. */
-
-/*
- * The following struct is returned in sensebuf field in uiscmdrsp_scsi. It is
- * initialized in exactly the manner that is recommended in Windows (hence the
- * odd values).
- * When set, these fields will have the following values:
- * ErrorCode = 0x70		indicates current error
- * Valid = 1			indicates sense info is valid
- * SenseKey			contains sense key as defined by SCSI specs.
- * AdditionalSenseCode		contains sense key as defined by SCSI specs.
- * AdditionalSenseCodeQualifier	contains qualifier to sense code as defined by
- *				scsi docs.
- * AdditionalSenseLength	contains will be sizeof(sense_data)-8=10.
- */
-struct sense_data {
-	u8 errorcode:7;
-	u8 valid:1;
-	u8 segment_number;
-	u8 sense_key:4;
-	u8 reserved:1;
-	u8 incorrect_length:1;
-	u8 end_of_media:1;
-	u8 file_mark:1;
-	u8 information[4];
-	u8 additional_sense_length;
-	u8 command_specific_information[4];
-	u8 additional_sense_code;
-	u8 additional_sense_code_qualifier;
-	u8 fru_code;
-	u8 sense_key_specific[3];
-} __packed;
-
-/*
- * struct net_pkt_xmt
- * @len:		    Full length of data in the packet.
- * @num_frags:		    Number of fragments in frags containing data.
- * @struct phys_info frags: Physical page information.
- * @ethhdr:		    The ethernet header.
- * @struct lincsum:	    These are needed for csum at uisnic end.
- *      @valid:	    1 = struct is valid - else ignore.
- *      @hrawoffv:  1 = hwrafoff is valid.
- *      @nhrawoffv: 1 = nhwrafoff is valid.
- *      @protocol:  Specifies packet protocol.
- *      @csum:	    Value used to set skb->csum at IOPart.
- *      @hrawoff:   Value used to set skb->h.raw at IOPart. hrawoff points to
- *		    the start of the TRANSPORT LAYER HEADER.
- *      @nhrawoff:  Value used to set skb->nh.raw at IOPart. nhrawoff points to
- *		    the start of the NETWORK LAYER HEADER.
- *
- * NOTE:
- * The full packet is described in frags but the ethernet header is separately
- * kept in ethhdr so that uisnic doesn't have "MAP" the guest memory to get to
- * the header. uisnic needs ethhdr to determine how to route the packet.
- */
-struct net_pkt_xmt {
-	int len;
-	int num_frags;
-	struct phys_info frags[MAX_PHYS_INFO];
-	char ethhdr[ETH_HLEN];
-	struct {
-		u8 valid;
-		u8 hrawoffv;
-		u8 nhrawoffv;
-		__be16 protocol;
-		__wsum csum;
-		u32 hrawoff;
-		u32 nhrawoff;
-	} lincsum;
-} __packed;
-
-struct net_pkt_xmtdone {
-	/* Result of NET_XMIT */
-	u32 xmt_done_result;
-} __packed;
-
-/*
- * RCVPOST_BUF_SIZE must be at most page_size(4096) - cache_line_size (64) The
- * reason is because dev_skb_alloc which is used to generate RCV_POST skbs in
- * visornic requires that there is "overhead" in the buffer, and pads 16 bytes.
- * Use 1 full cache line size for "overhead" so that transfers are optimized.
- * IOVM requires that a buffer be represented by 1 phys_info structure
- * which can only cover page_size.
- */
-#define RCVPOST_BUF_SIZE 4032
-#define MAX_NET_RCV_CHAIN \
-	((VISOR_ETH_MAX_MTU + ETH_HLEN + RCVPOST_BUF_SIZE - 1) \
-	 / RCVPOST_BUF_SIZE)
-
-/* rcv buf size must be large enough to include ethernet data len + ethernet
- * header len - we are choosing 2K because it is guaranteed to be describable.
- */
-struct net_pkt_rcvpost {
-	/* Physical page information for the single fragment 2K rcv buf */
-	struct phys_info frag;
-	/*
-	 * Ensures that receive posts are returned to the adapter which we sent
-	 * them from originally.
-	 */
-	u64 unique_num;
-
-} __packed;
-
-/*
- * struct net_pkt_rcv
- * @rcv_done_len:	Length of the received data.
- * @numrcvbufs:		Contains the incoming data. Guest side MUST chain these
- *			together.
- * @*rcvbuf:		List of chained rcvbufa. Each entry is a receive buffer
- *			provided by NET_RCV_POST. NOTE: First rcvbuf in the
- *			chain will also be provided in net.buf.
- * @unique_num:
- * @rcvs_dropped_delta:
- *
- * The number of rcvbuf that can be chained is based on max mtu and size of each
- * rcvbuf.
- */
-struct net_pkt_rcv {
-	u32 rcv_done_len;
-	u8 numrcvbufs;
-	void *rcvbuf[MAX_NET_RCV_CHAIN];
-	u64 unique_num;
-	u32 rcvs_dropped_delta;
-} __packed;
-
-struct net_pkt_enbdis {
-	void *context;
-	/* 1 = enable, 0 = disable */
-	u16 enable;
-} __packed;
-
-struct net_pkt_macaddr {
-	void *context;
-	/* 6 bytes */
-	u8 macaddr[MAX_MACADDR_LEN];
-} __packed;
-
-/*
- * struct uiscmdrsp_net - cmd rsp packet used for VNIC network traffic.
- * @enum type:
- * @*buf:
- * @union:
- *	@struct xmt:	 Used for NET_XMIT.
- *	@struct xmtdone: Used for NET_XMIT_DONE.
- *	@struct rcvpost: Used for NET_RCV_POST.
- *	@struct rcv:	 Used for NET_RCV.
- *	@struct enbdis:	 Used for NET_RCV_ENBDIS, NET_RCV_ENBDIS_ACK,
- *			 NET_RCV_PROMSIC, and NET_CONNECT_STATUS.
- *	@struct macaddr:
- */
-struct uiscmdrsp_net {
-	enum net_types type;
-	void *buf;
-	union {
-		struct net_pkt_xmt xmt;
-		struct net_pkt_xmtdone xmtdone;
-		struct net_pkt_rcvpost rcvpost;
-		struct net_pkt_rcv rcv;
-		struct net_pkt_enbdis enbdis;
-		struct net_pkt_macaddr macaddr;
-	};
-} __packed;
-
-/*
- * struct uiscmdrsp_scsitaskmgmt
- * @enum tasktype:	 The type of task.
- * @struct vdest:	 The vdisk for which this task mgmt is generated.
- * @handle:		 This is a handle that the guest has saved off for its
- *			 own use. The handle value is preserved by iopart and
- *			 returned as in task mgmt rsp.
- * @notify_handle:	 For Linux guests, this is a pointer to wait_queue_head
- *			 that a thread is waiting on to see if the taskmgmt
- *			 command has completed. When the rsp is received by
- *			 guest, the thread receiving the response uses this to
- *			 notify the thread waiting for taskmgmt command
- *			 completion. It's value is preserved by iopart and
- *			 returned as in the task mgmt rsp.
- * @notifyresult_handle: This is a handle to the location in the guest where
- *			 the result of the taskmgmt command (result field) is
- *			 saved to when the response is handled. It's value is
- *			 preserved by iopart and returned as is in the task mgmt
- *			 rsp.
- * @result:		 Result of taskmgmt command - set by IOPart.
- */
-struct uiscmdrsp_scsitaskmgmt {
-	enum task_mgmt_types tasktype;
-	struct uisscsi_dest vdest;
-	u64 handle;
-	u64 notify_handle;
-	u64 notifyresult_handle;
-	char result;
-
-#define TASK_MGMT_FAILED 0
-} __packed;
-
-/*
- * struct uiscmdrsp_disknotify - Used by uissd to send disk add/remove
- *				 notifications to Guest.
- * @add:     0-remove, 1-add.
- * @*v_hba:  Channel info to route msg.
- * @channel: SCSI Path of Disk to added or removed.
- * @id:	     SCSI Path of Disk to added or removed.
- * @lun:     SCSI Path of Disk to added or removed.
- *
- * Note that the vHba pointer is not used by the Client/Guest side.
- */
-struct uiscmdrsp_disknotify {
-	u8 add;
-	void *v_hba;
-	u32 channel, id, lun;
-} __packed;
-
-/* Keeping cmd and rsp info in one structure for now cmd rsp packet for SCSI */
-struct uiscmdrsp {
-	char cmdtype;
-	/* Describes what type of information is in the struct */
-#define CMD_SCSI_TYPE	      1
-#define CMD_NET_TYPE	      2
-#define CMD_SCSITASKMGMT_TYPE 3
-#define CMD_NOTIFYGUEST_TYPE  4
-	union {
-		struct uiscmdrsp_scsi scsi;
-		struct uiscmdrsp_net net;
-		struct uiscmdrsp_scsitaskmgmt scsitaskmgmt;
-		struct uiscmdrsp_disknotify disknotify;
-	};
-	/* Send the response when the cmd is done (scsi and scsittaskmgmt). */
-	void *private_data;
-	/* General Purpose Queue Link */
-	struct uiscmdrsp *next;
-	/* Pointer to the nextactive commands */
-	struct uiscmdrsp *activeQ_next;
-	/* Pointer to the prevactive commands */
-	struct uiscmdrsp *activeQ_prev;
-} __packed;
-
-/* total = 28 bytes */
-struct iochannel_vhba {
-	/* 8 bytes */
-	struct vhba_wwnn wwnn;
-	/* 20 bytes */
-	struct vhba_config_max max;
-} __packed;
-
-struct iochannel_vnic {
-	/* 6 bytes */
-	u8 macaddr[6];
-	/* 4 bytes */
-	u32 num_rcv_bufs;
-	/* 4 bytes */
-	u32 mtu;
-	/* 16 bytes */
-	guid_t zone_guid;
-} __packed;
-
-/*
- * This is just the header of the IO channel. It is assumed that directly after
- * this header there is a large region of memory which contains the command and
- * response queues as specified in cmd_q and rsp_q SIGNAL_QUEUE_HEADERS.
- */
-struct visor_io_channel {
-	struct channel_header channel_header;
-	struct signal_queue_header cmd_q;
-	struct signal_queue_header rsp_q;
-	union {
-		struct iochannel_vhba vhba;
-		struct iochannel_vnic vnic;
-	} __packed;
-
-#define MAX_CLIENTSTRING_LEN 1024
-	/* client_string is NULL termimated so holds max-1 bytes */
-	 u8 client_string[MAX_CLIENTSTRING_LEN];
-} __packed;
-
-/* INLINE functions for initializing and accessing I/O data channels. */
-#define SIZEOF_CMDRSP (64 * DIV_ROUND_UP(sizeof(struct uiscmdrsp), 64))
-
-/* Use 4K page sizes when passing page info between Guest and IOPartition. */
-#define PI_PAGE_SIZE 0x1000
-#define PI_PAGE_MASK 0x0FFF
-
-/* __IOCHANNEL_H__ */
-#endif
diff --git a/drivers/staging/unisys/visorhba/Kconfig b/drivers/staging/unisys/visorhba/Kconfig
deleted file mode 100644
index ed59ac11c322..000000000000
--- a/drivers/staging/unisys/visorhba/Kconfig
+++ /dev/null
@@ -1,15 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Unisys visorhba configuration
-#
-
-config UNISYS_VISORHBA
-	tristate "Unisys visorhba driver"
-	depends on UNISYSSPAR && UNISYS_VISORBUS && SCSI
-	help
-		The Unisys visorhba driver provides support for s-Par HBA
-		devices exposed on the s-Par visorbus. When a message is sent
-		to visorbus to create a HBA device, the probe function of
-		visorhba is called to create the scsi device.
-		If you say Y here, you will enable the Unisys visorhba driver.
-
diff --git a/drivers/staging/unisys/visorhba/Makefile b/drivers/staging/unisys/visorhba/Makefile
deleted file mode 100644
index b613a7dcdae9..000000000000
--- a/drivers/staging/unisys/visorhba/Makefile
+++ /dev/null
@@ -1,10 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for Unisys channel
-#
-
-obj-$(CONFIG_UNISYS_VISORHBA)	+= visorhba.o
-
-visorhba-y := visorhba_main.o
-
-ccflags-y += -I $(srctree)/$(src)/../include
diff --git a/drivers/staging/unisys/visorhba/visorhba_main.c b/drivers/staging/unisys/visorhba/visorhba_main.c
deleted file mode 100644
index 48aa18f8b984..000000000000
--- a/drivers/staging/unisys/visorhba/visorhba_main.c
+++ /dev/null
@@ -1,1142 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (c) 2012 - 2015 UNISYS CORPORATION
- * All rights reserved.
- */
-
-#include <linux/debugfs.h>
-#include <linux/kthread.h>
-#include <linux/module.h>
-#include <linux/seq_file.h>
-#include <linux/visorbus.h>
-#include <linux/xarray.h>
-#include <scsi/scsi.h>
-#include <scsi/scsi_host.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_device.h>
-
-#include "iochannel.h"
-
-/* The Send and Receive Buffers of the IO Queue may both be full */
-
-#define IOS_ERROR_THRESHOLD  1000
-#define MAX_PENDING_REQUESTS (MIN_NUMSIGNALS * 2)
-#define VISORHBA_ERROR_COUNT 30
-
-static struct dentry *visorhba_debugfs_dir;
-
-/* GUIDS for HBA channel type supported by this driver */
-static struct visor_channeltype_descriptor visorhba_channel_types[] = {
-	/* Note that the only channel type we expect to be reported by the
-	 * bus driver is the VISOR_VHBA channel.
-	 */
-	{ VISOR_VHBA_CHANNEL_GUID, "sparvhba", sizeof(struct channel_header),
-	  VISOR_VHBA_CHANNEL_VERSIONID },
-	{}
-};
-
-MODULE_DEVICE_TABLE(visorbus, visorhba_channel_types);
-MODULE_ALIAS("visorbus:" VISOR_VHBA_CHANNEL_GUID_STR);
-
-struct visordisk_info {
-	struct scsi_device *sdev;
-	u32 valid;
-	atomic_t ios_threshold;
-	atomic_t error_count;
-	struct visordisk_info *next;
-};
-
-struct scsipending {
-	struct uiscmdrsp cmdrsp;
-	/* The Data being tracked */
-	void *sent;
-	/* Type of pointer that is being stored */
-	char cmdtype;
-};
-
-/* Each scsi_host has a host_data area that contains this struct. */
-struct visorhba_devdata {
-	struct Scsi_Host *scsihost;
-	struct visor_device *dev;
-	struct list_head dev_info_list;
-	/* Tracks the requests that have been forwarded to
-	 * the IOVM and haven't returned yet
-	 */
-	struct scsipending pending[MAX_PENDING_REQUESTS];
-	/* Start search for next pending free slot here */
-	unsigned int nextinsert;
-	/* lock to protect data in devdata */
-	spinlock_t privlock;
-	bool serverdown;
-	bool serverchangingstate;
-	unsigned long long acquire_failed_cnt;
-	unsigned long long interrupts_rcvd;
-	unsigned long long interrupts_notme;
-	unsigned long long interrupts_disabled;
-	u64 __iomem *flags_addr;
-	struct visordisk_info head;
-	unsigned int max_buff_len;
-	int devnum;
-	struct uiscmdrsp *cmdrsp;
-	/*
-	 * allows us to pass int handles back-and-forth between us and
-	 * iovm, instead of raw pointers
-	 */
-	struct xarray xa;
-	struct dentry *debugfs_dir;
-	struct dentry *debugfs_info;
-};
-
-struct visorhba_devices_open {
-	struct visorhba_devdata *devdata;
-};
-
-/*
- * add_scsipending_entry - Save off io command that is pending in
- *			   Service Partition
- * @devdata: Pointer to devdata
- * @cmdtype: Specifies the type of command pending
- * @new:     The command to be saved
- *
- * Saves off the io command that is being handled by the Service
- * Partition so that it can be handled when it completes. If new is
- * NULL it is assumed the entry refers only to the cmdrsp.
- *
- * Return: Insert_location where entry was added on success,
- *	   -EBUSY if it can't
- */
-static int add_scsipending_entry(struct visorhba_devdata *devdata,
-				 char cmdtype, void *new)
-{
-	unsigned long flags;
-	struct scsipending *entry;
-	int insert_location;
-
-	spin_lock_irqsave(&devdata->privlock, flags);
-	insert_location = devdata->nextinsert;
-	while (devdata->pending[insert_location].sent) {
-		insert_location = (insert_location + 1) % MAX_PENDING_REQUESTS;
-		if (insert_location == (int)devdata->nextinsert) {
-			spin_unlock_irqrestore(&devdata->privlock, flags);
-			return -EBUSY;
-		}
-	}
-
-	entry = &devdata->pending[insert_location];
-	memset(&entry->cmdrsp, 0, sizeof(entry->cmdrsp));
-	entry->cmdtype = cmdtype;
-	if (new)
-		entry->sent = new;
-	/* wants to send cmdrsp */
-	else
-		entry->sent = &entry->cmdrsp;
-	devdata->nextinsert = (insert_location + 1) % MAX_PENDING_REQUESTS;
-	spin_unlock_irqrestore(&devdata->privlock, flags);
-
-	return insert_location;
-}
-
-/*
- * del_scsipending_ent - Removes an entry from the pending array
- * @devdata: Device holding the pending array
- * @del:     Entry to remove
- *
- * Removes the entry pointed at by del and returns it.
- *
- * Return: The scsipending entry pointed to on success, NULL on failure
- */
-static void *del_scsipending_ent(struct visorhba_devdata *devdata, int del)
-{
-	unsigned long flags;
-	void *sent;
-
-	if (del >= MAX_PENDING_REQUESTS)
-		return NULL;
-
-	spin_lock_irqsave(&devdata->privlock, flags);
-	sent = devdata->pending[del].sent;
-	devdata->pending[del].cmdtype = 0;
-	devdata->pending[del].sent = NULL;
-	spin_unlock_irqrestore(&devdata->privlock, flags);
-
-	return sent;
-}
-
-/*
- * get_scsipending_cmdrsp - Return the cmdrsp stored in a pending entry
- * @ddata: Device holding the pending array
- * @ent:   Entry that stores the cmdrsp
- *
- * Each scsipending entry has a cmdrsp in it. The cmdrsp is only valid
- * if the "sent" field is not NULL.
- *
- * Return: A pointer to the cmdrsp, NULL on failure
- */
-static struct uiscmdrsp *get_scsipending_cmdrsp(struct visorhba_devdata *ddata,
-						int ent)
-{
-	if (ddata->pending[ent].sent)
-		return &ddata->pending[ent].cmdrsp;
-
-	return NULL;
-}
-
-/*
- * setup_scsitaskmgmt_handles - Stash the necessary handles so that the
- *				completion processing logic for a taskmgmt
- *				cmd will be able to find who to wake up
- *				and where to stash the result
- * @xa:       The data object maintaining the pointer<-->int mappings
- * @cmdrsp:   Response from the IOVM
- * @event:    The event handle to associate with an id
- * @result:   The location to place the result of the event handle into
- */
-static int setup_scsitaskmgmt_handles(struct xarray *xa, struct uiscmdrsp *cmdrsp,
-				      wait_queue_head_t *event, int *result)
-{
-	int ret;
-	u32 id;
-
-	/* specify the event that has to be triggered when this cmd is complete */
-	ret = xa_alloc_irq(xa, &id, event, xa_limit_32b, GFP_KERNEL);
-	if (ret)
-		return ret;
-	cmdrsp->scsitaskmgmt.notify_handle = id;
-	ret = xa_alloc_irq(xa, &id, result, xa_limit_32b, GFP_KERNEL);
-	if (ret) {
-		xa_erase_irq(xa, cmdrsp->scsitaskmgmt.notify_handle);
-		return ret;
-	}
-	cmdrsp->scsitaskmgmt.notifyresult_handle = id;
-
-	return 0;
-}
-
-/*
- * cleanup_scsitaskmgmt_handles - Forget handles created by
- *				  setup_scsitaskmgmt_handles()
- * @xa: The data object maintaining the pointer<-->int mappings
- * @cmdrsp:   Response from the IOVM
- */
-static void cleanup_scsitaskmgmt_handles(struct xarray *xa,
-					 struct uiscmdrsp *cmdrsp)
-{
-	xa_erase_irq(xa, cmdrsp->scsitaskmgmt.notify_handle);
-	xa_erase_irq(xa, cmdrsp->scsitaskmgmt.notifyresult_handle);
-}
-
-/*
- * forward_taskmgmt_command - Send taskmegmt command to the Service
- *			      Partition
- * @tasktype: Type of taskmgmt command
- * @scsidev:  Scsidev that issued command
- *
- * Create a cmdrsp packet and send it to the Service Partition
- * that will service this request.
- *
- * Return: Int representing whether command was queued successfully or not
- */
-static int forward_taskmgmt_command(enum task_mgmt_types tasktype,
-				    struct scsi_device *scsidev)
-{
-	struct uiscmdrsp *cmdrsp;
-	struct visorhba_devdata *devdata =
-		(struct visorhba_devdata *)scsidev->host->hostdata;
-	int notifyresult = 0xffff;
-	wait_queue_head_t notifyevent;
-	int scsicmd_id;
-	int ret;
-
-	if (devdata->serverdown || devdata->serverchangingstate)
-		return FAILED;
-
-	scsicmd_id = add_scsipending_entry(devdata, CMD_SCSITASKMGMT_TYPE,
-					   NULL);
-	if (scsicmd_id < 0)
-		return FAILED;
-
-	cmdrsp = get_scsipending_cmdrsp(devdata, scsicmd_id);
-
-	init_waitqueue_head(&notifyevent);
-
-	/* issue TASK_MGMT_ABORT_TASK */
-	cmdrsp->cmdtype = CMD_SCSITASKMGMT_TYPE;
-
-	ret = setup_scsitaskmgmt_handles(&devdata->xa, cmdrsp,
-					 &notifyevent, &notifyresult);
-	if (ret) {
-		dev_dbg(&scsidev->sdev_gendev,
-			"visorhba: setup_scsitaskmgmt_handles returned %d\n", ret);
-		return FAILED;
-	}
-
-	/* save destination */
-	cmdrsp->scsitaskmgmt.tasktype = tasktype;
-	cmdrsp->scsitaskmgmt.vdest.channel = scsidev->channel;
-	cmdrsp->scsitaskmgmt.vdest.id = scsidev->id;
-	cmdrsp->scsitaskmgmt.vdest.lun = scsidev->lun;
-	cmdrsp->scsitaskmgmt.handle = scsicmd_id;
-
-	dev_dbg(&scsidev->sdev_gendev,
-		"visorhba: initiating type=%d taskmgmt command\n", tasktype);
-	if (visorchannel_signalinsert(devdata->dev->visorchannel,
-				      IOCHAN_TO_IOPART,
-				      cmdrsp))
-		goto err_del_scsipending_ent;
-
-	/* It can take the Service Partition up to 35 seconds to complete
-	 * an IO in some cases, so wait 45 seconds and error out
-	 */
-	if (!wait_event_timeout(notifyevent, notifyresult != 0xffff,
-				msecs_to_jiffies(45000)))
-		goto err_del_scsipending_ent;
-
-	dev_dbg(&scsidev->sdev_gendev,
-		"visorhba: taskmgmt type=%d success; result=0x%x\n",
-		 tasktype, notifyresult);
-	cleanup_scsitaskmgmt_handles(&devdata->xa, cmdrsp);
-	return SUCCESS;
-
-err_del_scsipending_ent:
-	dev_dbg(&scsidev->sdev_gendev,
-		"visorhba: taskmgmt type=%d not executed\n", tasktype);
-	del_scsipending_ent(devdata, scsicmd_id);
-	cleanup_scsitaskmgmt_handles(&devdata->xa, cmdrsp);
-	return FAILED;
-}
-
-/*
- * visorhba_abort_handler - Send TASK_MGMT_ABORT_TASK
- * @scsicmd: The scsicmd that needs aborted
- *
- * Return: SUCCESS if inserted, FAILED otherwise
- */
-static int visorhba_abort_handler(struct scsi_cmnd *scsicmd)
-{
-	/* issue TASK_MGMT_ABORT_TASK */
-	struct scsi_device *scsidev;
-	struct visordisk_info *vdisk;
-	int rtn;
-
-	scsidev = scsicmd->device;
-	vdisk = scsidev->hostdata;
-	if (atomic_read(&vdisk->error_count) < VISORHBA_ERROR_COUNT)
-		atomic_inc(&vdisk->error_count);
-	else
-		atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD);
-	rtn = forward_taskmgmt_command(TASK_MGMT_ABORT_TASK, scsidev);
-	if (rtn == SUCCESS) {
-		scsicmd->result = DID_ABORT << 16;
-		scsi_done(scsicmd);
-	}
-	return rtn;
-}
-
-/*
- * visorhba_device_reset_handler - Send TASK_MGMT_LUN_RESET
- * @scsicmd: The scsicmd that needs aborted
- *
- * Return: SUCCESS if inserted, FAILED otherwise
- */
-static int visorhba_device_reset_handler(struct scsi_cmnd *scsicmd)
-{
-	/* issue TASK_MGMT_LUN_RESET */
-	struct scsi_device *scsidev;
-	struct visordisk_info *vdisk;
-	int rtn;
-
-	scsidev = scsicmd->device;
-	vdisk = scsidev->hostdata;
-	if (atomic_read(&vdisk->error_count) < VISORHBA_ERROR_COUNT)
-		atomic_inc(&vdisk->error_count);
-	else
-		atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD);
-	rtn = forward_taskmgmt_command(TASK_MGMT_LUN_RESET, scsidev);
-	if (rtn == SUCCESS) {
-		scsicmd->result = DID_RESET << 16;
-		scsi_done(scsicmd);
-	}
-	return rtn;
-}
-
-/*
- * visorhba_bus_reset_handler - Send TASK_MGMT_TARGET_RESET for each
- *				target on the bus
- * @scsicmd: The scsicmd that needs aborted
- *
- * Return: SUCCESS if inserted, FAILED otherwise
- */
-static int visorhba_bus_reset_handler(struct scsi_cmnd *scsicmd)
-{
-	struct scsi_device *scsidev;
-	struct visordisk_info *vdisk;
-	int rtn;
-
-	scsidev = scsicmd->device;
-	shost_for_each_device(scsidev, scsidev->host) {
-		vdisk = scsidev->hostdata;
-		if (atomic_read(&vdisk->error_count) < VISORHBA_ERROR_COUNT)
-			atomic_inc(&vdisk->error_count);
-		else
-			atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD);
-	}
-	rtn = forward_taskmgmt_command(TASK_MGMT_BUS_RESET, scsidev);
-	if (rtn == SUCCESS) {
-		scsicmd->result = DID_RESET << 16;
-		scsi_done(scsicmd);
-	}
-	return rtn;
-}
-
-/*
- * visorhba_host_reset_handler - Not supported
- * @scsicmd: The scsicmd that needs to be aborted
- *
- * Return: Not supported, return SUCCESS
- */
-static int visorhba_host_reset_handler(struct scsi_cmnd *scsicmd)
-{
-	/* issue TASK_MGMT_TARGET_RESET for each target on each bus for host */
-	return SUCCESS;
-}
-
-/*
- * visorhba_get_info - Get information about SCSI device
- * @shp: Scsi host that is requesting information
- *
- * Return: String with visorhba information
- */
-static const char *visorhba_get_info(struct Scsi_Host *shp)
-{
-	/* Return version string */
-	return "visorhba";
-}
-
-/*
- * dma_data_dir_linux_to_spar - convert dma_data_direction value to
- *				Unisys-specific equivalent
- * @d: dma direction value to convert
- *
- * Returns the Unisys-specific dma direction value corresponding to @d
- */
-static u32 dma_data_dir_linux_to_spar(enum dma_data_direction d)
-{
-	switch (d) {
-	case DMA_BIDIRECTIONAL:
-		return UIS_DMA_BIDIRECTIONAL;
-	case DMA_TO_DEVICE:
-		return UIS_DMA_TO_DEVICE;
-	case DMA_FROM_DEVICE:
-		return UIS_DMA_FROM_DEVICE;
-	case DMA_NONE:
-		return UIS_DMA_NONE;
-	default:
-		return UIS_DMA_NONE;
-	}
-}
-
-/*
- * visorhba_queue_command_lck - Queues command to the Service Partition
- * @scsicmd:		Command to be queued
- * @vsiorhba_cmnd_done: Done command to call when scsicmd is returned
- *
- * Queues to scsicmd to the ServicePartition after converting it to a
- * uiscmdrsp structure.
- *
- * Return: 0 if successfully queued to the Service Partition, otherwise
- *	   error code
- */
-static int visorhba_queue_command_lck(struct scsi_cmnd *scsicmd)
-{
-	void (*visorhba_cmnd_done)(struct scsi_cmnd *) = scsi_done;
-	struct uiscmdrsp *cmdrsp;
-	struct scsi_device *scsidev = scsicmd->device;
-	int insert_location;
-	unsigned char *cdb = scsicmd->cmnd;
-	struct Scsi_Host *scsihost = scsidev->host;
-	unsigned int i;
-	struct visorhba_devdata *devdata =
-		(struct visorhba_devdata *)scsihost->hostdata;
-	struct scatterlist *sg = NULL;
-	struct scatterlist *sglist = NULL;
-
-	if (devdata->serverdown || devdata->serverchangingstate)
-		return SCSI_MLQUEUE_DEVICE_BUSY;
-
-	insert_location = add_scsipending_entry(devdata, CMD_SCSI_TYPE,
-						(void *)scsicmd);
-	if (insert_location < 0)
-		return SCSI_MLQUEUE_DEVICE_BUSY;
-
-	cmdrsp = get_scsipending_cmdrsp(devdata, insert_location);
-	cmdrsp->cmdtype = CMD_SCSI_TYPE;
-	/* save the pending insertion location. Deletion from pending
-	 * will return the scsicmd pointer for completion
-	 */
-	cmdrsp->scsi.handle = insert_location;
-
-	WARN_ON_ONCE(visorhba_cmnd_done != scsi_done);
-	/* save destination */
-	cmdrsp->scsi.vdest.channel = scsidev->channel;
-	cmdrsp->scsi.vdest.id = scsidev->id;
-	cmdrsp->scsi.vdest.lun = scsidev->lun;
-	/* save datadir */
-	cmdrsp->scsi.data_dir =
-		dma_data_dir_linux_to_spar(scsicmd->sc_data_direction);
-	memcpy(cmdrsp->scsi.cmnd, cdb, MAX_CMND_SIZE);
-	cmdrsp->scsi.bufflen = scsi_bufflen(scsicmd);
-
-	/* keep track of the max buffer length so far. */
-	if (cmdrsp->scsi.bufflen > devdata->max_buff_len)
-		devdata->max_buff_len = cmdrsp->scsi.bufflen;
-
-	if (scsi_sg_count(scsicmd) > MAX_PHYS_INFO)
-		goto err_del_scsipending_ent;
-
-	/* convert buffer to phys information  */
-	/* buffer is scatterlist - copy it out */
-	sglist = scsi_sglist(scsicmd);
-
-	for_each_sg(sglist, sg, scsi_sg_count(scsicmd), i) {
-		cmdrsp->scsi.gpi_list[i].address = sg_phys(sg);
-		cmdrsp->scsi.gpi_list[i].length = sg->length;
-	}
-	cmdrsp->scsi.guest_phys_entries = scsi_sg_count(scsicmd);
-
-	if (visorchannel_signalinsert(devdata->dev->visorchannel,
-				      IOCHAN_TO_IOPART,
-				      cmdrsp))
-		/* queue must be full and we aren't going to wait */
-		goto err_del_scsipending_ent;
-
-	return 0;
-
-err_del_scsipending_ent:
-	del_scsipending_ent(devdata, insert_location);
-	return SCSI_MLQUEUE_DEVICE_BUSY;
-}
-
-#ifdef DEF_SCSI_QCMD
-static DEF_SCSI_QCMD(visorhba_queue_command)
-#else
-#define visorhba_queue_command visorhba_queue_command_lck
-#endif
-
-/*
- * visorhba_slave_alloc - Called when new disk is discovered
- * @scsidev: New disk
- *
- * Create a new visordisk_info structure and add it to our
- * list of vdisks.
- *
- * Return: 0 on success, -ENOMEM on failure.
- */
-static int visorhba_slave_alloc(struct scsi_device *scsidev)
-{
-	/* this is called by the midlayer before scan for new devices --
-	 * LLD can alloc any struct & do init if needed.
-	 */
-	struct visordisk_info *vdisk;
-	struct visorhba_devdata *devdata;
-	struct Scsi_Host *scsihost = (struct Scsi_Host *)scsidev->host;
-
-	/* already allocated return success */
-	if (scsidev->hostdata)
-		return 0;
-
-	/* even though we errored, treat as success */
-	devdata = (struct visorhba_devdata *)scsihost->hostdata;
-	if (!devdata)
-		return 0;
-
-	vdisk = kzalloc(sizeof(*vdisk), GFP_ATOMIC);
-	if (!vdisk)
-		return -ENOMEM;
-
-	vdisk->sdev = scsidev;
-	scsidev->hostdata = vdisk;
-	return 0;
-}
-
-/*
- * visorhba_slave_destroy - Disk is going away, clean up resources.
- * @scsidev: Scsi device to destroy
- */
-static void visorhba_slave_destroy(struct scsi_device *scsidev)
-{
-	/* midlevel calls this after device has been quiesced and
-	 * before it is to be deleted.
-	 */
-	struct visordisk_info *vdisk;
-
-	vdisk = scsidev->hostdata;
-	scsidev->hostdata = NULL;
-	kfree(vdisk);
-}
-
-static struct scsi_host_template visorhba_driver_template = {
-	.name = "Unisys Visor HBA",
-	.info = visorhba_get_info,
-	.queuecommand = visorhba_queue_command,
-	.eh_abort_handler = visorhba_abort_handler,
-	.eh_device_reset_handler = visorhba_device_reset_handler,
-	.eh_bus_reset_handler = visorhba_bus_reset_handler,
-	.eh_host_reset_handler = visorhba_host_reset_handler,
-#define visorhba_MAX_CMNDS 128
-	.can_queue = visorhba_MAX_CMNDS,
-	.sg_tablesize = 64,
-	.this_id = -1,
-	.slave_alloc = visorhba_slave_alloc,
-	.slave_destroy = visorhba_slave_destroy,
-};
-
-/*
- * info_debugfs_show - Debugfs interface to dump visorhba states
- * @seq: The sequence file to write information to
- * @v:   Unused, but needed for use with seq file single_open invocation
- *
- * Presents a file in the debugfs tree named: /visorhba/vbus<x>:dev<y>/info.
- *
- * Return: SUCCESS
- */
-static int info_debugfs_show(struct seq_file *seq, void *v)
-{
-	struct visorhba_devdata *devdata = seq->private;
-
-	seq_printf(seq, "max_buff_len = %u\n", devdata->max_buff_len);
-	seq_printf(seq, "interrupts_rcvd = %llu\n", devdata->interrupts_rcvd);
-	seq_printf(seq, "interrupts_disabled = %llu\n",
-		   devdata->interrupts_disabled);
-	seq_printf(seq, "interrupts_notme = %llu\n",
-		   devdata->interrupts_notme);
-	seq_printf(seq, "flags_addr = %p\n", devdata->flags_addr);
-	if (devdata->flags_addr) {
-		u64 phys_flags_addr =
-			virt_to_phys((__force  void *)devdata->flags_addr);
-		seq_printf(seq, "phys_flags_addr = 0x%016llx\n",
-			   phys_flags_addr);
-		seq_printf(seq, "FeatureFlags = %llu\n",
-			   (u64)readq(devdata->flags_addr));
-	}
-	seq_printf(seq, "acquire_failed_cnt = %llu\n",
-		   devdata->acquire_failed_cnt);
-
-	return 0;
-}
-DEFINE_SHOW_ATTRIBUTE(info_debugfs);
-
-/*
- * complete_taskmgmt_command - Complete task management
- * @idrtable: The data object maintaining the pointer<-->int mappings
- * @cmdrsp:   Response from the IOVM
- * @result:   The result of the task management command
- *
- * Service Partition returned the result of the task management
- * command. Wake up anyone waiting for it.
- */
-static void complete_taskmgmt_command(struct xarray *xa,
-				      struct uiscmdrsp *cmdrsp, int result)
-{
-	wait_queue_head_t *wq =
-		xa_load(xa, cmdrsp->scsitaskmgmt.notify_handle);
-	int *scsi_result_ptr =
-		xa_load(xa, cmdrsp->scsitaskmgmt.notifyresult_handle);
-	if (unlikely(!(wq && scsi_result_ptr))) {
-		pr_err("visorhba: no completion context; cmd will time out\n");
-		return;
-	}
-
-	/* copy the result of the taskmgmt and
-	 * wake up the error handler that is waiting for this
-	 */
-	pr_debug("visorhba: notifying initiator with result=0x%x\n", result);
-	*scsi_result_ptr = result;
-	wake_up_all(wq);
-}
-
-/*
- * visorhba_serverdown_complete - Called when we are done cleaning up
- *				  from serverdown
- * @devdata: Visorhba instance on which to complete serverdown
- *
- * Called when we are done cleanning up from serverdown, stop processing
- * queue, fail pending IOs.
- */
-static void visorhba_serverdown_complete(struct visorhba_devdata *devdata)
-{
-	int i;
-	struct scsipending *pendingdel = NULL;
-	struct scsi_cmnd *scsicmd = NULL;
-	struct uiscmdrsp *cmdrsp;
-	unsigned long flags;
-
-	/* Stop using the IOVM response queue (queue should be drained
-	 * by the end)
-	 */
-	visorbus_disable_channel_interrupts(devdata->dev);
-
-	/* Fail commands that weren't completed */
-	spin_lock_irqsave(&devdata->privlock, flags);
-	for (i = 0; i < MAX_PENDING_REQUESTS; i++) {
-		pendingdel = &devdata->pending[i];
-		switch (pendingdel->cmdtype) {
-		case CMD_SCSI_TYPE:
-			scsicmd = pendingdel->sent;
-			scsicmd->result = DID_RESET << 16;
-			scsi_done(scsicmd);
-			break;
-		case CMD_SCSITASKMGMT_TYPE:
-			cmdrsp = pendingdel->sent;
-			complete_taskmgmt_command(&devdata->xa, cmdrsp,
-						  TASK_MGMT_FAILED);
-			break;
-		default:
-			break;
-		}
-		pendingdel->cmdtype = 0;
-		pendingdel->sent = NULL;
-	}
-	spin_unlock_irqrestore(&devdata->privlock, flags);
-
-	devdata->serverdown = true;
-	devdata->serverchangingstate = false;
-}
-
-/*
- * visorhba_serverdown - Got notified that the IOVM is down
- * @devdata: Visorhba that is being serviced by downed IOVM
- *
- * Something happened to the IOVM, return immediately and
- * schedule cleanup work.
- *
- * Return: 0 on success, -EINVAL on failure
- */
-static int visorhba_serverdown(struct visorhba_devdata *devdata)
-{
-	if (!devdata->serverdown && !devdata->serverchangingstate) {
-		devdata->serverchangingstate = true;
-		visorhba_serverdown_complete(devdata);
-	} else if (devdata->serverchangingstate) {
-		return -EINVAL;
-	}
-	return 0;
-}
-
-/*
- * do_scsi_linuxstat - Scsi command returned linuxstat
- * @cmdrsp:  Response from IOVM
- * @scsicmd: Command issued
- *
- * Don't log errors for disk-not-present inquiries.
- */
-static void do_scsi_linuxstat(struct uiscmdrsp *cmdrsp,
-			      struct scsi_cmnd *scsicmd)
-{
-	struct visordisk_info *vdisk;
-	struct scsi_device *scsidev;
-
-	scsidev = scsicmd->device;
-	memcpy(scsicmd->sense_buffer, cmdrsp->scsi.sensebuf, MAX_SENSE_SIZE);
-
-	/* Do not log errors for disk-not-present inquiries */
-	if (cmdrsp->scsi.cmnd[0] == INQUIRY &&
-	    (host_byte(cmdrsp->scsi.linuxstat) == DID_NO_CONNECT) &&
-	    cmdrsp->scsi.addlstat == ADDL_SEL_TIMEOUT)
-		return;
-	/* Okay see what our error_count is here.... */
-	vdisk = scsidev->hostdata;
-	if (atomic_read(&vdisk->error_count) < VISORHBA_ERROR_COUNT) {
-		atomic_inc(&vdisk->error_count);
-		atomic_set(&vdisk->ios_threshold, IOS_ERROR_THRESHOLD);
-	}
-}
-
-static int set_no_disk_inquiry_result(unsigned char *buf, size_t len,
-				      bool is_lun0)
-{
-	if (len < NO_DISK_INQUIRY_RESULT_LEN)
-		return -EINVAL;
-	memset(buf, 0, NO_DISK_INQUIRY_RESULT_LEN);
-	buf[2] = SCSI_SPC2_VER;
-	if (is_lun0) {
-		buf[0] = DEV_DISK_CAPABLE_NOT_PRESENT;
-		buf[3] = DEV_HISUPPORT;
-	} else {
-		buf[0] = DEV_NOT_CAPABLE;
-	}
-	buf[4] = NO_DISK_INQUIRY_RESULT_LEN - 5;
-	strncpy(buf + 8, "DELLPSEUDO DEVICE .", NO_DISK_INQUIRY_RESULT_LEN - 8);
-	return 0;
-}
-
-/*
- * do_scsi_nolinuxstat - Scsi command didn't have linuxstat
- * @cmdrsp:  Response from IOVM
- * @scsicmd: Command issued
- *
- * Handle response when no linuxstat was returned.
- */
-static void do_scsi_nolinuxstat(struct uiscmdrsp *cmdrsp,
-				struct scsi_cmnd *scsicmd)
-{
-	struct scsi_device *scsidev;
-	unsigned char *buf;
-	struct scatterlist *sg;
-	unsigned int i;
-	char *this_page;
-	char *this_page_orig;
-	int bufind = 0;
-	struct visordisk_info *vdisk;
-
-	scsidev = scsicmd->device;
-	if (cmdrsp->scsi.cmnd[0] == INQUIRY &&
-	    cmdrsp->scsi.bufflen >= MIN_INQUIRY_RESULT_LEN) {
-		if (cmdrsp->scsi.no_disk_result == 0)
-			return;
-
-		buf = kzalloc(36, GFP_KERNEL);
-		if (!buf)
-			return;
-
-		/* Linux scsi code wants a device at Lun 0
-		 * to issue report luns, but we don't want
-		 * a disk there so we'll present a processor
-		 * there.
-		 */
-		set_no_disk_inquiry_result(buf, (size_t)cmdrsp->scsi.bufflen,
-					   scsidev->lun == 0);
-
-		if (scsi_sg_count(scsicmd) == 0) {
-			memcpy(scsi_sglist(scsicmd), buf,
-			       cmdrsp->scsi.bufflen);
-			kfree(buf);
-			return;
-		}
-
-		scsi_for_each_sg(scsicmd, sg, scsi_sg_count(scsicmd), i) {
-			this_page_orig = kmap_atomic(sg_page(sg));
-			this_page = (void *)((unsigned long)this_page_orig |
-					     sg->offset);
-			memcpy(this_page, buf + bufind, sg->length);
-			kunmap_atomic(this_page_orig);
-		}
-		kfree(buf);
-	} else {
-		vdisk = scsidev->hostdata;
-		if (atomic_read(&vdisk->ios_threshold) > 0) {
-			atomic_dec(&vdisk->ios_threshold);
-			if (atomic_read(&vdisk->ios_threshold) == 0)
-				atomic_set(&vdisk->error_count, 0);
-		}
-	}
-}
-
-/*
- * complete_scsi_command - Complete a scsi command
- * @uiscmdrsp: Response from Service Partition
- * @scsicmd:   The scsi command
- *
- * Response was returned by the Service Partition. Finish it and send
- * completion to the scsi midlayer.
- */
-static void complete_scsi_command(struct uiscmdrsp *cmdrsp,
-				  struct scsi_cmnd *scsicmd)
-{
-	/* take what we need out of cmdrsp and complete the scsicmd */
-	scsicmd->result = cmdrsp->scsi.linuxstat;
-	if (cmdrsp->scsi.linuxstat)
-		do_scsi_linuxstat(cmdrsp, scsicmd);
-	else
-		do_scsi_nolinuxstat(cmdrsp, scsicmd);
-
-	scsi_done(scsicmd);
-}
-
-/*
- * drain_queue - Pull responses out of iochannel
- * @cmdrsp:  Response from the IOSP
- * @devdata: Device that owns this iochannel
- *
- * Pulls responses out of the iochannel and process the responses.
- */
-static void drain_queue(struct uiscmdrsp *cmdrsp,
-			struct visorhba_devdata *devdata)
-{
-	struct scsi_cmnd *scsicmd;
-
-	while (1) {
-		/* queue empty */
-		if (visorchannel_signalremove(devdata->dev->visorchannel,
-					      IOCHAN_FROM_IOPART,
-					      cmdrsp))
-			break;
-		if (cmdrsp->cmdtype == CMD_SCSI_TYPE) {
-			/* scsicmd location is returned by the
-			 * deletion
-			 */
-			scsicmd = del_scsipending_ent(devdata,
-						      cmdrsp->scsi.handle);
-			if (!scsicmd)
-				break;
-			/* complete the orig cmd */
-			complete_scsi_command(cmdrsp, scsicmd);
-		} else if (cmdrsp->cmdtype == CMD_SCSITASKMGMT_TYPE) {
-			if (!del_scsipending_ent(devdata,
-						 cmdrsp->scsitaskmgmt.handle))
-				break;
-			complete_taskmgmt_command(&devdata->xa, cmdrsp,
-						  cmdrsp->scsitaskmgmt.result);
-		} else if (cmdrsp->cmdtype == CMD_NOTIFYGUEST_TYPE)
-			dev_err_once(&devdata->dev->device,
-				     "ignoring unsupported NOTIFYGUEST\n");
-		/* cmdrsp is now available for re-use */
-	}
-}
-
-/*
- * This is used only when this driver is active as an hba driver in the
- * client guest partition.  It is called periodically so we can obtain
- * and process the command respond from the IO Service Partition periodically.
- */
-static void visorhba_channel_interrupt(struct visor_device *dev)
-{
-	struct visorhba_devdata *devdata = dev_get_drvdata(&dev->device);
-
-	if (!devdata)
-		return;
-
-	drain_queue(devdata->cmdrsp, devdata);
-}
-
-/*
- * visorhba_pause - Function to handle visorbus pause messages
- * @dev:	   Device that is pausing
- * @complete_func: Function to call when finished
- *
- * Something has happened to the IO Service Partition that is
- * handling this device. Quiet this device and reset commands
- * so that the Service Partition can be corrected.
- *
- * Return: SUCCESS
- */
-static int visorhba_pause(struct visor_device *dev,
-			  visorbus_state_complete_func complete_func)
-{
-	struct visorhba_devdata *devdata = dev_get_drvdata(&dev->device);
-
-	visorhba_serverdown(devdata);
-	complete_func(dev, 0);
-	return 0;
-}
-
-/*
- * visorhba_resume - Function called when the IO Service Partition is back
- * @dev:	   Device that is pausing
- * @complete_func: Function to call when finished
- *
- * Yay! The IO Service Partition is back, the channel has been wiped
- * so lets re-establish connection and start processing responses.
- *
- * Return: 0 on success, -EINVAL on failure
- */
-static int visorhba_resume(struct visor_device *dev,
-			   visorbus_state_complete_func complete_func)
-{
-	struct visorhba_devdata *devdata;
-
-	devdata = dev_get_drvdata(&dev->device);
-	if (!devdata)
-		return -EINVAL;
-
-	if (devdata->serverdown && !devdata->serverchangingstate)
-		devdata->serverchangingstate = true;
-
-	visorbus_enable_channel_interrupts(dev);
-	devdata->serverdown = false;
-	devdata->serverchangingstate = false;
-
-	return 0;
-}
-
-/*
- * visorhba_probe - Device has been discovered; do acquire
- * @dev: visor_device that was discovered
- *
- * A new HBA was discovered; do the initial connections of it.
- *
- * Return: 0 on success, otherwise error code
- */
-static int visorhba_probe(struct visor_device *dev)
-{
-	struct Scsi_Host *scsihost;
-	struct vhba_config_max max;
-	struct visorhba_devdata *devdata = NULL;
-	int err, channel_offset;
-	u64 features;
-
-	scsihost = scsi_host_alloc(&visorhba_driver_template,
-				   sizeof(*devdata));
-	if (!scsihost)
-		return -ENODEV;
-
-	channel_offset = offsetof(struct visor_io_channel, vhba.max);
-	err = visorbus_read_channel(dev, channel_offset, &max,
-				    sizeof(struct vhba_config_max));
-	if (err < 0)
-		goto err_scsi_host_put;
-
-	scsihost->max_id = (unsigned int)max.max_id;
-	scsihost->max_lun = (unsigned int)max.max_lun;
-	scsihost->cmd_per_lun = (unsigned int)max.cmd_per_lun;
-	scsihost->max_sectors =
-	    (unsigned short)(max.max_io_size >> 9);
-	scsihost->sg_tablesize =
-	    (unsigned short)(max.max_io_size / PAGE_SIZE);
-	if (scsihost->sg_tablesize > MAX_PHYS_INFO)
-		scsihost->sg_tablesize = MAX_PHYS_INFO;
-	err = scsi_add_host(scsihost, &dev->device);
-	if (err < 0)
-		goto err_scsi_host_put;
-
-	devdata = (struct visorhba_devdata *)scsihost->hostdata;
-	devdata->dev = dev;
-	dev_set_drvdata(&dev->device, devdata);
-
-	devdata->debugfs_dir = debugfs_create_dir(dev_name(&dev->device),
-						  visorhba_debugfs_dir);
-	if (!devdata->debugfs_dir) {
-		err = -ENOMEM;
-		goto err_scsi_remove_host;
-	}
-	devdata->debugfs_info =
-		debugfs_create_file("info", 0440,
-				    devdata->debugfs_dir, devdata,
-				    &info_debugfs_fops);
-	if (!devdata->debugfs_info) {
-		err = -ENOMEM;
-		goto err_debugfs_dir;
-	}
-
-	spin_lock_init(&devdata->privlock);
-	devdata->serverdown = false;
-	devdata->serverchangingstate = false;
-	devdata->scsihost = scsihost;
-
-	channel_offset = offsetof(struct visor_io_channel,
-				  channel_header.features);
-	err = visorbus_read_channel(dev, channel_offset, &features, 8);
-	if (err)
-		goto err_debugfs_info;
-	features |= VISOR_CHANNEL_IS_POLLING;
-	err = visorbus_write_channel(dev, channel_offset, &features, 8);
-	if (err)
-		goto err_debugfs_info;
-
-	xa_init(&devdata->xa);
-
-	devdata->cmdrsp = kmalloc(sizeof(*devdata->cmdrsp), GFP_ATOMIC);
-	visorbus_enable_channel_interrupts(dev);
-
-	scsi_scan_host(scsihost);
-
-	return 0;
-
-err_debugfs_info:
-	debugfs_remove(devdata->debugfs_info);
-
-err_debugfs_dir:
-	debugfs_remove_recursive(devdata->debugfs_dir);
-
-err_scsi_remove_host:
-	scsi_remove_host(scsihost);
-
-err_scsi_host_put:
-	scsi_host_put(scsihost);
-	return err;
-}
-
-/*
- * visorhba_remove - Remove a visorhba device
- * @dev: Device to remove
- *
- * Removes the visorhba device.
- */
-static void visorhba_remove(struct visor_device *dev)
-{
-	struct visorhba_devdata *devdata = dev_get_drvdata(&dev->device);
-	struct Scsi_Host *scsihost = NULL;
-
-	if (!devdata)
-		return;
-
-	scsihost = devdata->scsihost;
-	kfree(devdata->cmdrsp);
-	visorbus_disable_channel_interrupts(dev);
-	scsi_remove_host(scsihost);
-	scsi_host_put(scsihost);
-
-	dev_set_drvdata(&dev->device, NULL);
-	debugfs_remove(devdata->debugfs_info);
-	debugfs_remove_recursive(devdata->debugfs_dir);
-}
-
-/* This is used to tell the visorbus driver which types of visor devices
- * we support, and what functions to call when a visor device that we support
- * is attached or removed.
- */
-static struct visor_driver visorhba_driver = {
-	.name = "visorhba",
-	.owner = THIS_MODULE,
-	.channel_types = visorhba_channel_types,
-	.probe = visorhba_probe,
-	.remove = visorhba_remove,
-	.pause = visorhba_pause,
-	.resume = visorhba_resume,
-	.channel_interrupt = visorhba_channel_interrupt,
-};
-
-/*
- * visorhba_init - Driver init routine
- *
- * Initialize the visorhba driver and register it with visorbus
- * to handle s-Par virtual host bus adapter.
- *
- * Return: 0 on success, error code otherwise
- */
-static int visorhba_init(void)
-{
-	int rc;
-
-	visorhba_debugfs_dir = debugfs_create_dir("visorhba", NULL);
-	if (!visorhba_debugfs_dir)
-		return -ENOMEM;
-
-	rc = visorbus_register_visor_driver(&visorhba_driver);
-	if (rc)
-		goto cleanup_debugfs;
-
-	return 0;
-
-cleanup_debugfs:
-	debugfs_remove_recursive(visorhba_debugfs_dir);
-
-	return rc;
-}
-
-/*
- * visorhba_exit - Driver exit routine
- *
- * Unregister driver from the bus and free up memory.
- */
-static void visorhba_exit(void)
-{
-	visorbus_unregister_visor_driver(&visorhba_driver);
-	debugfs_remove_recursive(visorhba_debugfs_dir);
-}
-
-module_init(visorhba_init);
-module_exit(visorhba_exit);
-
-MODULE_AUTHOR("Unisys");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("s-Par HBA driver for virtual SCSI host busses");
diff --git a/drivers/staging/unisys/visorinput/Kconfig b/drivers/staging/unisys/visorinput/Kconfig
deleted file mode 100644
index 5f036393aee9..000000000000
--- a/drivers/staging/unisys/visorinput/Kconfig
+++ /dev/null
@@ -1,16 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Unisys visorinput configuration
-#
-
-config UNISYS_VISORINPUT
-	tristate "Unisys visorinput driver"
-	depends on UNISYSSPAR && UNISYS_VISORBUS && INPUT
-	help
-		The Unisys s-Par visorinput driver provides a virtualized system
-		console (keyboard and mouse) that is accessible through the
-		s-Par firmware's user interface. s-Par provides video using the EFI
-		GOP protocol, so If this driver is not present, the Linux guest should
-		still boot with visible output in the partition desktop, but keyboard
-		and mouse interaction will not be available.
-
diff --git a/drivers/staging/unisys/visorinput/Makefile b/drivers/staging/unisys/visorinput/Makefile
deleted file mode 100644
index 68ced7c8a65f..000000000000
--- a/drivers/staging/unisys/visorinput/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for Unisys visorinput
-#
-
-obj-$(CONFIG_UNISYS_VISORINPUT)	+= visorinput.o
-
diff --git a/drivers/staging/unisys/visorinput/visorinput.c b/drivers/staging/unisys/visorinput/visorinput.c
deleted file mode 100644
index dffa71ac3cc5..000000000000
--- a/drivers/staging/unisys/visorinput/visorinput.c
+++ /dev/null
@@ -1,788 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2011 - 2015 UNISYS CORPORATION
- * All rights reserved.
- */
-
-/*
- * This driver lives in a generic guest Linux partition, and registers to
- * receive keyboard and mouse channels from the visorbus driver.  It reads
- * inputs from such channels, and delivers it to the Linux OS in the
- * standard way the Linux expects for input drivers.
- */
-
-#include <linux/fb.h>
-#include <linux/input.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/uuid.h>
-#include <linux/visorbus.h>
-
-/* These defines identify mouse and keyboard activity which is specified by the
- * firmware to the host using the cmsimpleinput protocol.  @ingroup coretypes
- */
-/* only motion; arg1=x, arg2=y */
-#define INPUTACTION_XY_MOTION 1
-
-/* arg1: 1=left,2=center,3=right */
-#define INPUTACTION_MOUSE_BUTTON_DOWN 2
-#define INPUTACTION_MOUSE_BUTTON_UP 3
-#define INPUTACTION_MOUSE_BUTTON_CLICK 4
-#define INPUTACTION_MOUSE_BUTTON_DCLICK 5
-
-/* arg1: wheel rotation away from/toward user */
-#define INPUTACTION_WHEEL_ROTATE_AWAY 6
-#define INPUTACTION_WHEEL_ROTATE_TOWARD 7
-
-/* arg1: scancode, as follows: If arg1 <= 0xff, it's a 1-byte scancode and arg1
- *	 is that scancode. If arg1 > 0xff, it's a 2-byte scanecode, with the 1st
- *	 byte in the low 8 bits, and the 2nd byte in the high 8 bits.
- *	 E.g., the right ALT key would appear as x'38e0'.
- */
-#define INPUTACTION_KEY_DOWN 64
-#define INPUTACTION_KEY_UP 65
-#define INPUTACTION_KEY_DOWN_UP 67
-
-/* arg1: scancode (in same format as inputaction_keyDown); MUST refer to one of
- *	 the locking keys, like capslock, numlock, or scrolllock.
- * arg2: 1 iff locking key should be in the LOCKED position (e.g., light is ON)
- */
-#define INPUTACTION_SET_LOCKING_KEY_STATE 66
-
-/* Keyboard channel {c73416d0-b0b8-44af-b304-9d2ae99f1b3d} */
-#define VISOR_KEYBOARD_CHANNEL_GUID \
-	GUID_INIT(0xc73416d0, 0xb0b8, 0x44af, \
-		  0xb3, 0x4, 0x9d, 0x2a, 0xe9, 0x9f, 0x1b, 0x3d)
-#define VISOR_KEYBOARD_CHANNEL_GUID_STR "c73416d0-b0b8-44af-b304-9d2ae99f1b3d"
-
-/* Mouse channel {addf07d4-94a9-46e2-81c3-61abcdbdbd87} */
-#define VISOR_MOUSE_CHANNEL_GUID \
-	GUID_INIT(0xaddf07d4, 0x94a9, 0x46e2, \
-		  0x81, 0xc3, 0x61, 0xab, 0xcd, 0xbd, 0xbd, 0x87)
-#define VISOR_MOUSE_CHANNEL_GUID_STR "addf07d4-94a9-46e2-81c3-61abcdbdbd87"
-
-#define PIXELS_ACROSS_DEFAULT 1024
-#define PIXELS_DOWN_DEFAULT   768
-#define KEYCODE_TABLE_BYTES   256
-
-struct visor_inputactivity {
-	u16 action;
-	u16 arg1;
-	u16 arg2;
-	u16 arg3;
-} __packed;
-
-struct visor_inputreport {
-	u64 seq_no;
-	struct visor_inputactivity activity;
-} __packed;
-
-/* header of keyboard/mouse channels */
-struct visor_input_channel_data {
-	u32 n_input_reports;
-	union {
-		struct {
-			u16 x_res;
-			u16 y_res;
-		} mouse;
-		struct {
-			u32 flags;
-		} keyboard;
-	};
-} __packed;
-
-enum visorinput_dev_type {
-	visorinput_keyboard,
-	visorinput_mouse,
-};
-
-/*
- * This is the private data that we store for each device. A pointer to this
- * struct is maintained via dev_get_drvdata() / dev_set_drvdata() for each
- * struct device.
- */
-struct visorinput_devdata {
-	struct visor_device *dev;
-	/* lock for dev */
-	struct mutex lock_visor_dev;
-	struct input_dev *visorinput_dev;
-	bool paused;
-	bool interrupts_enabled;
-	/* size of following array */
-	unsigned int keycode_table_bytes;
-	/* for keyboard devices: visorkbd_keycode[] + visorkbd_ext_keycode[] */
-	unsigned char keycode_table[];
-};
-
-static const guid_t visor_keyboard_channel_guid = VISOR_KEYBOARD_CHANNEL_GUID;
-static const guid_t visor_mouse_channel_guid = VISOR_MOUSE_CHANNEL_GUID;
-
-/*
- * Borrowed from drivers/input/keyboard/atakbd.c
- * This maps 1-byte scancodes to keycodes.
- */
-static const unsigned char visorkbd_keycode[KEYCODE_TABLE_BYTES] = {
-	/* American layout */
-	[0] = KEY_GRAVE,
-	[1] = KEY_ESC,
-	[2] = KEY_1,
-	[3] = KEY_2,
-	[4] = KEY_3,
-	[5] = KEY_4,
-	[6] = KEY_5,
-	[7] = KEY_6,
-	[8] = KEY_7,
-	[9] = KEY_8,
-	[10] = KEY_9,
-	[11] = KEY_0,
-	[12] = KEY_MINUS,
-	[13] = KEY_EQUAL,
-	[14] = KEY_BACKSPACE,
-	[15] = KEY_TAB,
-	[16] = KEY_Q,
-	[17] = KEY_W,
-	[18] = KEY_E,
-	[19] = KEY_R,
-	[20] = KEY_T,
-	[21] = KEY_Y,
-	[22] = KEY_U,
-	[23] = KEY_I,
-	[24] = KEY_O,
-	[25] = KEY_P,
-	[26] = KEY_LEFTBRACE,
-	[27] = KEY_RIGHTBRACE,
-	[28] = KEY_ENTER,
-	[29] = KEY_LEFTCTRL,
-	[30] = KEY_A,
-	[31] = KEY_S,
-	[32] = KEY_D,
-	[33] = KEY_F,
-	[34] = KEY_G,
-	[35] = KEY_H,
-	[36] = KEY_J,
-	[37] = KEY_K,
-	[38] = KEY_L,
-	[39] = KEY_SEMICOLON,
-	[40] = KEY_APOSTROPHE,
-	[41] = KEY_GRAVE,
-	[42] = KEY_LEFTSHIFT,
-	[43] = KEY_BACKSLASH,
-	[44] = KEY_Z,
-	[45] = KEY_X,
-	[46] = KEY_C,
-	[47] = KEY_V,
-	[48] = KEY_B,
-	[49] = KEY_N,
-	[50] = KEY_M,
-	[51] = KEY_COMMA,
-	[52] = KEY_DOT,
-	[53] = KEY_SLASH,
-	[54] = KEY_RIGHTSHIFT,
-	[55] = KEY_KPASTERISK,
-	[56] = KEY_LEFTALT,
-	[57] = KEY_SPACE,
-	[58] = KEY_CAPSLOCK,
-	[59] = KEY_F1,
-	[60] = KEY_F2,
-	[61] = KEY_F3,
-	[62] = KEY_F4,
-	[63] = KEY_F5,
-	[64] = KEY_F6,
-	[65] = KEY_F7,
-	[66] = KEY_F8,
-	[67] = KEY_F9,
-	[68] = KEY_F10,
-	[69] = KEY_NUMLOCK,
-	[70] = KEY_SCROLLLOCK,
-	[71] = KEY_KP7,
-	[72] = KEY_KP8,
-	[73] = KEY_KP9,
-	[74] = KEY_KPMINUS,
-	[75] = KEY_KP4,
-	[76] = KEY_KP5,
-	[77] = KEY_KP6,
-	[78] = KEY_KPPLUS,
-	[79] = KEY_KP1,
-	[80] = KEY_KP2,
-	[81] = KEY_KP3,
-	[82] = KEY_KP0,
-	[83] = KEY_KPDOT,
-	/* enables UK backslash+pipe key and FR lessthan+greaterthan key */
-	[86] = KEY_102ND,
-	[87] = KEY_F11,
-	[88] = KEY_F12,
-	[90] = KEY_KPLEFTPAREN,
-	[91] = KEY_KPRIGHTPAREN,
-	[92] = KEY_KPASTERISK,
-	[93] = KEY_KPASTERISK,
-	[94] = KEY_KPPLUS,
-	[95] = KEY_HELP,
-	[96] = KEY_KPENTER,
-	[97] = KEY_RIGHTCTRL,
-	[98] = KEY_KPSLASH,
-	[99] = KEY_KPLEFTPAREN,
-	[100] = KEY_KPRIGHTPAREN,
-	[101] = KEY_KPSLASH,
-	[102] = KEY_HOME,
-	[103] = KEY_UP,
-	[104] = KEY_PAGEUP,
-	[105] = KEY_LEFT,
-	[106] = KEY_RIGHT,
-	[107] = KEY_END,
-	[108] = KEY_DOWN,
-	[109] = KEY_PAGEDOWN,
-	[110] = KEY_INSERT,
-	[111] = KEY_DELETE,
-	[112] = KEY_MACRO,
-	[113] = KEY_MUTE
-};
-
-/*
- * This maps the <xx> in extended scancodes of the form "0xE0 <xx>" into
- * keycodes.
- */
-static const unsigned char visorkbd_ext_keycode[KEYCODE_TABLE_BYTES] = {
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,		    /* 0x00 */
-	0, 0, 0, 0, 0, 0, 0, 0,					    /* 0x10 */
-	0, 0, 0, 0, KEY_KPENTER, KEY_RIGHTCTRL, 0, 0,		    /* 0x18 */
-	0, 0, 0, 0, 0, 0, 0, 0,					    /* 0x20 */
-	KEY_RIGHTALT, 0, 0, 0, 0, 0, 0, 0,			    /* 0x28 */
-	0, 0, 0, 0, 0, 0, 0, 0,					    /* 0x30 */
-	KEY_RIGHTALT /* AltGr */, 0, 0, 0, 0, 0, 0, 0,		    /* 0x38 */
-	0, 0, 0, 0, 0, 0, 0, KEY_HOME,				    /* 0x40 */
-	KEY_UP, KEY_PAGEUP, 0, KEY_LEFT, 0, KEY_RIGHT, 0, KEY_END,  /* 0x48 */
-	KEY_DOWN, KEY_PAGEDOWN, KEY_INSERT, KEY_DELETE, 0, 0, 0, 0, /* 0x50 */
-	0, 0, 0, 0, 0, 0, 0, 0,					    /* 0x58 */
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,		    /* 0x60 */
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,		    /* 0x70 */
-};
-
-static int visorinput_open(struct input_dev *visorinput_dev)
-{
-	struct visorinput_devdata *devdata = input_get_drvdata(visorinput_dev);
-
-	if (!devdata) {
-		dev_err(&visorinput_dev->dev,
-			"%s input_get_drvdata(%p) returned NULL\n",
-			__func__, visorinput_dev);
-		return -EINVAL;
-	}
-	dev_dbg(&visorinput_dev->dev, "%s opened\n", __func__);
-
-	/*
-	 * If we're not paused, really enable interrupts. Regardless of whether
-	 * we are paused, set a flag indicating interrupts should be enabled so
-	 * when we resume, interrupts will really be enabled.
-	 */
-	mutex_lock(&devdata->lock_visor_dev);
-	devdata->interrupts_enabled = true;
-	if (devdata->paused)
-		goto out_unlock;
-	visorbus_enable_channel_interrupts(devdata->dev);
-
-out_unlock:
-	mutex_unlock(&devdata->lock_visor_dev);
-	return 0;
-}
-
-static void visorinput_close(struct input_dev *visorinput_dev)
-{
-	struct visorinput_devdata *devdata = input_get_drvdata(visorinput_dev);
-
-	if (!devdata) {
-		dev_err(&visorinput_dev->dev,
-			"%s input_get_drvdata(%p) returned NULL\n",
-			__func__, visorinput_dev);
-		return;
-	}
-	dev_dbg(&visorinput_dev->dev, "%s closed\n", __func__);
-
-	/*
-	 * If we're not paused, really disable interrupts. Regardless of
-	 * whether we are paused, set a flag indicating interrupts should be
-	 * disabled so when we resume we will not re-enable them.
-	 */
-	mutex_lock(&devdata->lock_visor_dev);
-	devdata->interrupts_enabled = false;
-	if (devdata->paused)
-		goto out_unlock;
-	visorbus_disable_channel_interrupts(devdata->dev);
-
-out_unlock:
-	mutex_unlock(&devdata->lock_visor_dev);
-}
-
-/*
- * setup_client_keyboard() initializes and returns a Linux input node that we
- * can use to deliver keyboard inputs to Linux.  We of course do this when we
- * see keyboard inputs coming in on a keyboard channel.
- */
-static struct input_dev *setup_client_keyboard(void *devdata,
-					       unsigned char *keycode_table)
-
-{
-	int i;
-	struct input_dev *visorinput_dev = input_allocate_device();
-
-	if (!visorinput_dev)
-		return NULL;
-
-	visorinput_dev->name = "visor Keyboard";
-	visorinput_dev->phys = "visorkbd:input0";
-	visorinput_dev->id.bustype = BUS_VIRTUAL;
-	visorinput_dev->id.vendor = 0x0001;
-	visorinput_dev->id.product = 0x0001;
-	visorinput_dev->id.version = 0x0100;
-
-	visorinput_dev->evbit[0] = BIT_MASK(EV_KEY) |
-				   BIT_MASK(EV_REP) |
-				   BIT_MASK(EV_LED);
-	visorinput_dev->ledbit[0] = BIT_MASK(LED_CAPSL) |
-				    BIT_MASK(LED_SCROLLL) |
-				    BIT_MASK(LED_NUML);
-	visorinput_dev->keycode = keycode_table;
-	/* sizeof(unsigned char) */
-	visorinput_dev->keycodesize = 1;
-	visorinput_dev->keycodemax = KEYCODE_TABLE_BYTES;
-
-	for (i = 1; i < visorinput_dev->keycodemax; i++)
-		set_bit(keycode_table[i], visorinput_dev->keybit);
-	for (i = 1; i < visorinput_dev->keycodemax; i++)
-		set_bit(keycode_table[i + KEYCODE_TABLE_BYTES],
-			visorinput_dev->keybit);
-
-	visorinput_dev->open = visorinput_open;
-	visorinput_dev->close = visorinput_close;
-	/* pre input_register! */
-	input_set_drvdata(visorinput_dev, devdata);
-
-	return visorinput_dev;
-}
-
-static struct input_dev *setup_client_mouse(void *devdata, unsigned int xres,
-					    unsigned int yres)
-{
-	struct input_dev *visorinput_dev = input_allocate_device();
-
-	if (!visorinput_dev)
-		return NULL;
-
-	visorinput_dev->name = "visor Mouse";
-	visorinput_dev->phys = "visormou:input0";
-	visorinput_dev->id.bustype = BUS_VIRTUAL;
-	visorinput_dev->id.vendor = 0x0001;
-	visorinput_dev->id.product = 0x0002;
-	visorinput_dev->id.version = 0x0100;
-
-	visorinput_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
-	set_bit(BTN_LEFT, visorinput_dev->keybit);
-	set_bit(BTN_RIGHT, visorinput_dev->keybit);
-	set_bit(BTN_MIDDLE, visorinput_dev->keybit);
-
-	if (xres == 0)
-		xres = PIXELS_ACROSS_DEFAULT;
-	if (yres == 0)
-		yres = PIXELS_DOWN_DEFAULT;
-	input_set_abs_params(visorinput_dev, ABS_X, 0, xres, 0, 0);
-	input_set_abs_params(visorinput_dev, ABS_Y, 0, yres, 0, 0);
-
-	visorinput_dev->open = visorinput_open;
-	visorinput_dev->close = visorinput_close;
-	/* pre input_register! */
-	input_set_drvdata(visorinput_dev, devdata);
-	input_set_capability(visorinput_dev, EV_REL, REL_WHEEL);
-
-	return visorinput_dev;
-}
-
-static struct visorinput_devdata *devdata_create(struct visor_device *dev,
-						 enum visorinput_dev_type dtype)
-{
-	struct visorinput_devdata *devdata = NULL;
-	unsigned int extra_bytes = 0;
-	unsigned int size, xres, yres, err;
-	struct visor_input_channel_data data;
-
-	if (dtype == visorinput_keyboard)
-		/* allocate room for devdata->keycode_table, filled in below */
-		extra_bytes = KEYCODE_TABLE_BYTES * 2;
-	devdata = kzalloc(struct_size(devdata, keycode_table, extra_bytes),
-			  GFP_KERNEL);
-	if (!devdata)
-		return NULL;
-	mutex_init(&devdata->lock_visor_dev);
-	mutex_lock(&devdata->lock_visor_dev);
-	devdata->dev = dev;
-
-	/*
-	 * visorinput_open() can be called as soon as input_register_device()
-	 * happens, and that will enable channel interrupts.  Setting paused
-	 * prevents us from getting into visorinput_channel_interrupt() prior
-	 * to the device structure being totally initialized.
-	 */
-	devdata->paused = true;
-
-	/*
-	 * This is an input device in a client guest partition, so we need to
-	 * create whatever input nodes are necessary to deliver our inputs to
-	 * the guest OS.
-	 */
-	switch (dtype) {
-	case visorinput_keyboard:
-		devdata->keycode_table_bytes = extra_bytes;
-		memcpy(devdata->keycode_table, visorkbd_keycode,
-		       KEYCODE_TABLE_BYTES);
-		memcpy(devdata->keycode_table + KEYCODE_TABLE_BYTES,
-		       visorkbd_ext_keycode, KEYCODE_TABLE_BYTES);
-		devdata->visorinput_dev = setup_client_keyboard
-			(devdata, devdata->keycode_table);
-		if (!devdata->visorinput_dev)
-			goto cleanups_register;
-		break;
-	case visorinput_mouse:
-		size = sizeof(struct visor_input_channel_data);
-		err = visorbus_read_channel(dev, sizeof(struct channel_header),
-					    &data, size);
-		if (err)
-			goto cleanups_register;
-		xres = data.mouse.x_res;
-		yres = data.mouse.y_res;
-		devdata->visorinput_dev = setup_client_mouse(devdata, xres,
-							     yres);
-		if (!devdata->visorinput_dev)
-			goto cleanups_register;
-		break;
-	default:
-		/* No other input devices supported */
-		break;
-	}
-
-	dev_set_drvdata(&dev->device, devdata);
-	mutex_unlock(&devdata->lock_visor_dev);
-
-	/*
-	 * Device struct is completely set up now, with the exception of
-	 * visorinput_dev being registered. We need to unlock before we
-	 * register the device, because this can cause an on-stack call of
-	 * visorinput_open(), which would deadlock if we had the lock.
-	 */
-	if (input_register_device(devdata->visorinput_dev)) {
-		input_free_device(devdata->visorinput_dev);
-		goto err_kfree_devdata;
-	}
-
-	mutex_lock(&devdata->lock_visor_dev);
-	/*
-	 * Establish calls to visorinput_channel_interrupt() if that is the
-	 * desired state that we've kept track of in interrupts_enabled while
-	 * the device was being created.
-	 */
-	devdata->paused = false;
-	if (devdata->interrupts_enabled)
-		visorbus_enable_channel_interrupts(dev);
-	mutex_unlock(&devdata->lock_visor_dev);
-
-	return devdata;
-
-cleanups_register:
-	mutex_unlock(&devdata->lock_visor_dev);
-err_kfree_devdata:
-	kfree(devdata);
-	return NULL;
-}
-
-static int visorinput_probe(struct visor_device *dev)
-{
-	const guid_t *guid;
-	enum visorinput_dev_type dtype;
-
-	guid = visorchannel_get_guid(dev->visorchannel);
-	if (guid_equal(guid, &visor_mouse_channel_guid))
-		dtype = visorinput_mouse;
-	else if (guid_equal(guid, &visor_keyboard_channel_guid))
-		dtype = visorinput_keyboard;
-	else
-		return -ENODEV;
-	visorbus_disable_channel_interrupts(dev);
-	if (!devdata_create(dev, dtype))
-		return -ENOMEM;
-	return 0;
-}
-
-static void unregister_client_input(struct input_dev *visorinput_dev)
-{
-	if (visorinput_dev)
-		input_unregister_device(visorinput_dev);
-}
-
-static void visorinput_remove(struct visor_device *dev)
-{
-	struct visorinput_devdata *devdata = dev_get_drvdata(&dev->device);
-
-	if (!devdata)
-		return;
-
-	mutex_lock(&devdata->lock_visor_dev);
-	visorbus_disable_channel_interrupts(dev);
-
-	/*
-	 * due to above, at this time no thread of execution will be in
-	 * visorinput_channel_interrupt()
-	 */
-
-	dev_set_drvdata(&dev->device, NULL);
-	mutex_unlock(&devdata->lock_visor_dev);
-
-	unregister_client_input(devdata->visorinput_dev);
-	kfree(devdata);
-}
-
-/*
- * Make it so the current locking state of the locking key indicated by
- * <keycode> is as indicated by <desired_state> (1=locked, 0=unlocked).
- */
-static void handle_locking_key(struct input_dev *visorinput_dev, int keycode,
-			       int desired_state)
-{
-	int led;
-
-	switch (keycode) {
-	case KEY_CAPSLOCK:
-		led = LED_CAPSL;
-		break;
-	case KEY_SCROLLLOCK:
-		led = LED_SCROLLL;
-		break;
-	case KEY_NUMLOCK:
-		led = LED_NUML;
-		break;
-	default:
-		return;
-	}
-	if (test_bit(led, visorinput_dev->led) != desired_state) {
-		input_report_key(visorinput_dev, keycode, 1);
-		input_sync(visorinput_dev);
-		input_report_key(visorinput_dev, keycode, 0);
-		input_sync(visorinput_dev);
-		__change_bit(led, visorinput_dev->led);
-	}
-}
-
-/*
- * <scancode> is either a 1-byte scancode, or an extended 16-bit scancode with
- * 0xE0 in the low byte and the extended scancode value in the next higher byte.
- */
-static int scancode_to_keycode(int scancode)
-{
-	if (scancode > 0xff)
-		return visorkbd_ext_keycode[(scancode >> 8) & 0xff];
-
-	return visorkbd_keycode[scancode];
-}
-
-static int calc_button(int x)
-{
-	switch (x) {
-	case 1:
-		return BTN_LEFT;
-	case 2:
-		return BTN_MIDDLE;
-	case 3:
-		return BTN_RIGHT;
-	default:
-		return -EINVAL;
-	}
-}
-
-/*
- * This is used only when this driver is active as an input driver in the
- * client guest partition.  It is called periodically so we can obtain inputs
- * from the channel, and deliver them to the guest OS.
- */
-static void visorinput_channel_interrupt(struct visor_device *dev)
-{
-	struct visor_inputreport r;
-	int scancode, keycode;
-	struct input_dev *visorinput_dev;
-	int xmotion, ymotion, button;
-	int i;
-	struct visorinput_devdata *devdata = dev_get_drvdata(&dev->device);
-
-	if (!devdata)
-		return;
-
-	visorinput_dev = devdata->visorinput_dev;
-
-	while (!visorchannel_signalremove(dev->visorchannel, 0, &r)) {
-		scancode = r.activity.arg1;
-		keycode = scancode_to_keycode(scancode);
-		switch (r.activity.action) {
-		case INPUTACTION_KEY_DOWN:
-			input_report_key(visorinput_dev, keycode, 1);
-			input_sync(visorinput_dev);
-			break;
-		case INPUTACTION_KEY_UP:
-			input_report_key(visorinput_dev, keycode, 0);
-			input_sync(visorinput_dev);
-			break;
-		case INPUTACTION_KEY_DOWN_UP:
-			input_report_key(visorinput_dev, keycode, 1);
-			input_sync(visorinput_dev);
-			input_report_key(visorinput_dev, keycode, 0);
-			input_sync(visorinput_dev);
-			break;
-		case INPUTACTION_SET_LOCKING_KEY_STATE:
-			handle_locking_key(visorinput_dev, keycode,
-					   r.activity.arg2);
-			break;
-		case INPUTACTION_XY_MOTION:
-			xmotion = r.activity.arg1;
-			ymotion = r.activity.arg2;
-			input_report_abs(visorinput_dev, ABS_X, xmotion);
-			input_report_abs(visorinput_dev, ABS_Y, ymotion);
-			input_sync(visorinput_dev);
-			break;
-		case INPUTACTION_MOUSE_BUTTON_DOWN:
-			button = calc_button(r.activity.arg1);
-			if (button < 0)
-				break;
-			input_report_key(visorinput_dev, button, 1);
-			input_sync(visorinput_dev);
-			break;
-		case INPUTACTION_MOUSE_BUTTON_UP:
-			button = calc_button(r.activity.arg1);
-			if (button < 0)
-				break;
-			input_report_key(visorinput_dev, button, 0);
-			input_sync(visorinput_dev);
-			break;
-		case INPUTACTION_MOUSE_BUTTON_CLICK:
-			button = calc_button(r.activity.arg1);
-			if (button < 0)
-				break;
-			input_report_key(visorinput_dev, button, 1);
-			input_sync(visorinput_dev);
-			input_report_key(visorinput_dev, button, 0);
-			input_sync(visorinput_dev);
-			break;
-		case INPUTACTION_MOUSE_BUTTON_DCLICK:
-			button = calc_button(r.activity.arg1);
-			if (button < 0)
-				break;
-			for (i = 0; i < 2; i++) {
-				input_report_key(visorinput_dev, button, 1);
-				input_sync(visorinput_dev);
-				input_report_key(visorinput_dev, button, 0);
-				input_sync(visorinput_dev);
-			}
-			break;
-		case INPUTACTION_WHEEL_ROTATE_AWAY:
-			input_report_rel(visorinput_dev, REL_WHEEL, 1);
-			input_sync(visorinput_dev);
-			break;
-		case INPUTACTION_WHEEL_ROTATE_TOWARD:
-			input_report_rel(visorinput_dev, REL_WHEEL, -1);
-			input_sync(visorinput_dev);
-			break;
-		default:
-			/* Unsupported input action */
-			break;
-		}
-	}
-}
-
-static int visorinput_pause(struct visor_device *dev,
-			    visorbus_state_complete_func complete_func)
-{
-	int rc;
-	struct visorinput_devdata *devdata = dev_get_drvdata(&dev->device);
-
-	if (!devdata) {
-		rc = -ENODEV;
-		goto out;
-	}
-
-	mutex_lock(&devdata->lock_visor_dev);
-	if (devdata->paused) {
-		rc = -EBUSY;
-		goto out_locked;
-	}
-	if (devdata->interrupts_enabled)
-		visorbus_disable_channel_interrupts(dev);
-
-	/*
-	 * due to above, at this time no thread of execution will be in
-	 * visorinput_channel_interrupt()
-	 */
-	devdata->paused = true;
-	complete_func(dev, 0);
-	rc = 0;
-out_locked:
-	mutex_unlock(&devdata->lock_visor_dev);
-out:
-	return rc;
-}
-
-static int visorinput_resume(struct visor_device *dev,
-			     visorbus_state_complete_func complete_func)
-{
-	int rc;
-	struct visorinput_devdata *devdata = dev_get_drvdata(&dev->device);
-
-	if (!devdata) {
-		rc = -ENODEV;
-		goto out;
-	}
-	mutex_lock(&devdata->lock_visor_dev);
-	if (!devdata->paused) {
-		rc = -EBUSY;
-		goto out_locked;
-	}
-	devdata->paused = false;
-	complete_func(dev, 0);
-
-	/*
-	 * Re-establish calls to visorinput_channel_interrupt() if that is the
-	 * desired state that we've kept track of in interrupts_enabled while
-	 * the device was paused.
-	 */
-	if (devdata->interrupts_enabled)
-		visorbus_enable_channel_interrupts(dev);
-
-	rc = 0;
-out_locked:
-	mutex_unlock(&devdata->lock_visor_dev);
-out:
-	return rc;
-}
-
-/* GUIDS for all channel types supported by this driver. */
-static struct visor_channeltype_descriptor visorinput_channel_types[] = {
-	{ VISOR_KEYBOARD_CHANNEL_GUID, "keyboard",
-	  sizeof(struct channel_header), 0 },
-	{ VISOR_MOUSE_CHANNEL_GUID, "mouse", sizeof(struct channel_header), 0 },
-	{}
-};
-
-static struct visor_driver visorinput_driver = {
-	.name = "visorinput",
-	.owner = THIS_MODULE,
-	.channel_types = visorinput_channel_types,
-	.probe = visorinput_probe,
-	.remove = visorinput_remove,
-	.channel_interrupt = visorinput_channel_interrupt,
-	.pause = visorinput_pause,
-	.resume = visorinput_resume,
-};
-
-module_driver(visorinput_driver, visorbus_register_visor_driver,
-	      visorbus_unregister_visor_driver);
-
-MODULE_DEVICE_TABLE(visorbus, visorinput_channel_types);
-
-MODULE_AUTHOR("Unisys");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("s-Par human input driver for virtual keyboard/mouse");
-
-MODULE_ALIAS("visorbus:" VISOR_MOUSE_CHANNEL_GUID_STR);
-MODULE_ALIAS("visorbus:" VISOR_KEYBOARD_CHANNEL_GUID_STR);
diff --git a/drivers/staging/unisys/visornic/Kconfig b/drivers/staging/unisys/visornic/Kconfig
deleted file mode 100644
index 3f8f5570821b..000000000000
--- a/drivers/staging/unisys/visornic/Kconfig
+++ /dev/null
@@ -1,16 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Unisys visornic configuration
-#
-
-config UNISYS_VISORNIC
-	tristate "Unisys visornic driver"
-	depends on UNISYSSPAR && UNISYS_VISORBUS && NET
-	help
-		The Unisys Visornic driver provides support for s-Par network
-		devices exposed on the s-Par visorbus. When a message is sent
-		to visorbus to create a network device, the probe function of
-		visornic is called to create the netdev device. Networking on
-		s-Par switches will not work if this driver is not selected.
-		If you say Y here, you will enable the Unisys visornic driver.
-
diff --git a/drivers/staging/unisys/visornic/Makefile b/drivers/staging/unisys/visornic/Makefile
deleted file mode 100644
index f2984880c340..000000000000
--- a/drivers/staging/unisys/visornic/Makefile
+++ /dev/null
@@ -1,10 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for Unisys channel
-#
-
-obj-$(CONFIG_UNISYS_VISORNIC)	+= visornic.o
-
-visornic-y := visornic_main.o
-
-ccflags-y += -I $(srctree)/$(src)/../include
diff --git a/drivers/staging/unisys/visornic/visornic_main.c b/drivers/staging/unisys/visornic/visornic_main.c
deleted file mode 100644
index bb7ec492503e..000000000000
--- a/drivers/staging/unisys/visornic/visornic_main.c
+++ /dev/null
@@ -1,2131 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (c) 2012 - 2015 UNISYS CORPORATION
- * All rights reserved.
- */
-
-/* This driver lives in a spar partition, and registers to ethernet io
- * channels from the visorbus driver. It creates netdev devices and
- * forwards transmit to the IO channel and accepts rcvs from the IO
- * Partition via the IO channel.
- */
-
-#include <linux/debugfs.h>
-#include <linux/etherdevice.h>
-#include <linux/module.h>
-#include <linux/netdevice.h>
-#include <linux/kthread.h>
-#include <linux/skbuff.h>
-#include <linux/rtnetlink.h>
-#include <linux/visorbus.h>
-
-#include "iochannel.h"
-
-#define VISORNIC_INFINITE_RSP_WAIT 0
-
-/* MAX_BUF = 64 lines x 32 MAXVNIC x 80 characters
- *         = 163840 bytes
- */
-#define MAX_BUF 163840
-#define NAPI_WEIGHT 64
-
-/* GUIDS for director channel type supported by this driver.  */
-/* {8cd5994d-c58e-11da-95a9-00e08161165f} */
-#define VISOR_VNIC_CHANNEL_GUID \
-	GUID_INIT(0x8cd5994d, 0xc58e, 0x11da, \
-		0x95, 0xa9, 0x0, 0xe0, 0x81, 0x61, 0x16, 0x5f)
-#define VISOR_VNIC_CHANNEL_GUID_STR \
-	"8cd5994d-c58e-11da-95a9-00e08161165f"
-
-static struct visor_channeltype_descriptor visornic_channel_types[] = {
-	/* Note that the only channel type we expect to be reported by the
-	 * bus driver is the VISOR_VNIC channel.
-	 */
-	{ VISOR_VNIC_CHANNEL_GUID, "ultravnic", sizeof(struct channel_header),
-	  VISOR_VNIC_CHANNEL_VERSIONID },
-	{}
-};
-MODULE_DEVICE_TABLE(visorbus, visornic_channel_types);
-/* FIXME XXX: This next line of code must be fixed and removed before
- * acceptance into the 'normal' part of the kernel.  It is only here as a place
- * holder to get module autoloading functionality working for visorbus.  Code
- * must be added to scripts/mode/file2alias.c, etc., to get this working
- * properly.
- */
-MODULE_ALIAS("visorbus:" VISOR_VNIC_CHANNEL_GUID_STR);
-
-struct chanstat {
-	unsigned long got_rcv;
-	unsigned long got_enbdisack;
-	unsigned long got_xmit_done;
-	unsigned long xmit_fail;
-	unsigned long sent_enbdis;
-	unsigned long sent_promisc;
-	unsigned long sent_post;
-	unsigned long sent_post_failed;
-	unsigned long sent_xmit;
-	unsigned long reject_count;
-	unsigned long extra_rcvbufs_sent;
-};
-
-/* struct visornic_devdata
- * @enabled:                        0 disabled 1 enabled to receive.
- * @enab_dis_acked:                 NET_RCV_ENABLE/DISABLE acked by IOPART.
- * @struct *dev:
- * @struct *netdev:
- * @struct net_stats:
- * @interrupt_rcvd:
- * @rsp_queue:
- * @struct **rcvbuf:
- * @incarnation_id:                 incarnation_id lets IOPART know about
- *                                  re-birth.
- * @old_flags:                      flags as they were prior to
- *                                  set_multicast_list.
- * @usage:                          count of users.
- * @num_rcv_bufs:                   number of rcv buffers the vnic will post.
- * @num_rcv_bufs_could_not_alloc:
- * @num_rcvbuf_in_iovm:
- * @alloc_failed_in_if_needed_cnt:
- * @alloc_failed_in_repost_rtn_cnt:
- * @max_outstanding_net_xmits:      absolute max number of outstanding xmits
- *                                  - should never hit this.
- * @upper_threshold_net_xmits:      high water mark for calling
- *                                  netif_stop_queue().
- * @lower_threshold_net_xmits:      high water mark for calling
- *                                  netif_wake_queue().
- * @struct xmitbufhead:             xmitbufhead - head of the xmit buffer list
- *                                  sent to the IOPART end.
- * @server_down_complete_func:
- * @struct timeout_reset:
- * @struct *cmdrsp_rcv:             cmdrsp_rcv is used for posting/unposting rcv
- *                                  buffers.
- * @struct *xmit_cmdrsp:            xmit_cmdrsp - issues NET_XMIT - only one
- *                                  active xmit at a time.
- * @server_down:                    IOPART is down.
- * @server_change_state:            Processing SERVER_CHANGESTATE msg.
- * @going_away:                     device is being torn down.
- * @interrupts_rcvd:
- * @interrupts_notme:
- * @interrupts_disabled:
- * @busy_cnt:
- * @priv_lock:                      spinlock to access devdata structures.
- * @flow_control_upper_hits:
- * @flow_control_lower_hits:
- * @n_rcv0:                         # rcvs of 0 buffers.
- * @n_rcv1:                         # rcvs of 1 buffers.
- * @n_rcv2:                         # rcvs of 2 buffers.
- * @n_rcvx:                         # rcvs of >2 buffers.
- * @found_repost_rcvbuf_cnt:        # repost_rcvbuf_cnt.
- * @repost_found_skb_cnt:           # of found the skb.
- * @n_repost_deficit:               # of lost rcv buffers.
- * @bad_rcv_buf:                    # of unknown rcv skb not freed.
- * @n_rcv_packets_not_accepted:     # bogs rcv packets.
- * @queuefullmsg_logged:
- * @struct chstat:
- * @struct napi:
- * @struct cmdrsp:
- */
-struct visornic_devdata {
-	unsigned short enabled;
-	unsigned short enab_dis_acked;
-
-	struct visor_device *dev;
-	struct net_device *netdev;
-	struct net_device_stats net_stats;
-	atomic_t interrupt_rcvd;
-	wait_queue_head_t rsp_queue;
-	struct sk_buff **rcvbuf;
-	u64 incarnation_id;
-	unsigned short old_flags;
-	atomic_t usage;
-
-	int num_rcv_bufs;
-	int num_rcv_bufs_could_not_alloc;
-	atomic_t num_rcvbuf_in_iovm;
-	unsigned long alloc_failed_in_if_needed_cnt;
-	unsigned long alloc_failed_in_repost_rtn_cnt;
-
-	unsigned long max_outstanding_net_xmits;
-	unsigned long upper_threshold_net_xmits;
-	unsigned long lower_threshold_net_xmits;
-	struct sk_buff_head xmitbufhead;
-
-	visorbus_state_complete_func server_down_complete_func;
-	struct work_struct timeout_reset;
-	struct uiscmdrsp *cmdrsp_rcv;
-	struct uiscmdrsp *xmit_cmdrsp;
-	bool server_down;
-	bool server_change_state;
-	bool going_away;
-	u64 interrupts_rcvd;
-	u64 interrupts_notme;
-	u64 interrupts_disabled;
-	u64 busy_cnt;
-	/* spinlock to access devdata structures. */
-	spinlock_t priv_lock;
-
-	/* flow control counter */
-	u64 flow_control_upper_hits;
-	u64 flow_control_lower_hits;
-
-	/* debug counters */
-	unsigned long n_rcv0;
-	unsigned long n_rcv1;
-	unsigned long n_rcv2;
-	unsigned long n_rcvx;
-	unsigned long found_repost_rcvbuf_cnt;
-	unsigned long repost_found_skb_cnt;
-	unsigned long n_repost_deficit;
-	unsigned long bad_rcv_buf;
-	unsigned long n_rcv_packets_not_accepted;
-
-	int queuefullmsg_logged;
-	struct chanstat chstat;
-	struct napi_struct napi;
-	struct uiscmdrsp cmdrsp[SIZEOF_CMDRSP];
-};
-
-/* Returns next non-zero index on success or 0 on failure (i.e. out of room). */
-static u16 add_physinfo_entries(u64 inp_pfn, u16 inp_off, u16 inp_len,
-				u16 index, u16 max_pi_arr_entries,
-				struct phys_info pi_arr[])
-{
-	u16 i, len, firstlen;
-
-	firstlen = PI_PAGE_SIZE - inp_off;
-	if (inp_len <= firstlen) {
-		/* The input entry spans only one page - add as is. */
-		if (index >= max_pi_arr_entries)
-			return 0;
-		pi_arr[index].pi_pfn = inp_pfn;
-		pi_arr[index].pi_off = (u16)inp_off;
-		pi_arr[index].pi_len = (u16)inp_len;
-		return index + 1;
-	}
-
-	/* This entry spans multiple pages. */
-	for (len = inp_len, i = 0; len;
-		len -= pi_arr[index + i].pi_len, i++) {
-		if (index + i >= max_pi_arr_entries)
-			return 0;
-		pi_arr[index + i].pi_pfn = inp_pfn + i;
-		if (i == 0) {
-			pi_arr[index].pi_off = inp_off;
-			pi_arr[index].pi_len = firstlen;
-		} else {
-			pi_arr[index + i].pi_off = 0;
-			pi_arr[index + i].pi_len = min_t(u16, len,
-							 PI_PAGE_SIZE);
-		}
-	}
-	return index + i;
-}
-
-/* visor_copy_fragsinfo_from_skb - copy fragment list in the SKB to a phys_info
- *				   array that the IOPART understands
- * @skb:	  Skbuff that we are pulling the frags from.
- * @firstfraglen: Length of first fragment in skb.
- * @frags_max:	  Max len of frags array.
- * @frags:	  Frags array filled in on output.
- *
- * Return: Positive integer indicating number of entries filled in frags on
- *         success, negative integer on error.
- */
-static int visor_copy_fragsinfo_from_skb(struct sk_buff *skb,
-					 unsigned int firstfraglen,
-					 unsigned int frags_max,
-					 struct phys_info frags[])
-{
-	unsigned int count = 0, frag, size, offset = 0, numfrags;
-	unsigned int total_count;
-
-	numfrags = skb_shinfo(skb)->nr_frags;
-
-	/* Compute the number of fragments this skb has, and if its more than
-	 * frag array can hold, linearize the skb
-	 */
-	total_count = numfrags + (firstfraglen / PI_PAGE_SIZE);
-	if (firstfraglen % PI_PAGE_SIZE)
-		total_count++;
-
-	if (total_count > frags_max) {
-		if (skb_linearize(skb))
-			return -EINVAL;
-		numfrags = skb_shinfo(skb)->nr_frags;
-		firstfraglen = 0;
-	}
-
-	while (firstfraglen) {
-		if (count == frags_max)
-			return -EINVAL;
-
-		frags[count].pi_pfn =
-			page_to_pfn(virt_to_page(skb->data + offset));
-		frags[count].pi_off =
-			(unsigned long)(skb->data + offset) & PI_PAGE_MASK;
-		size = min_t(unsigned int, firstfraglen,
-			     PI_PAGE_SIZE - frags[count].pi_off);
-
-		/* can take smallest of firstfraglen (what's left) OR
-		 * bytes left in the page
-		 */
-		frags[count].pi_len = size;
-		firstfraglen -= size;
-		offset += size;
-		count++;
-	}
-	if (numfrags) {
-		if ((count + numfrags) > frags_max)
-			return -EINVAL;
-
-		for (frag = 0; frag < numfrags; frag++) {
-			count = add_physinfo_entries(page_to_pfn(
-				  skb_frag_page(&skb_shinfo(skb)->frags[frag])),
-				  skb_frag_off(&skb_shinfo(skb)->frags[frag]),
-				  skb_frag_size(&skb_shinfo(skb)->frags[frag]),
-				  count, frags_max, frags);
-			/* add_physinfo_entries only returns
-			 * zero if the frags array is out of room
-			 * That should never happen because we
-			 * fail above, if count+numfrags > frags_max.
-			 */
-			if (!count)
-				return -EINVAL;
-		}
-	}
-	if (skb_shinfo(skb)->frag_list) {
-		struct sk_buff *skbinlist;
-		int c;
-
-		for (skbinlist = skb_shinfo(skb)->frag_list; skbinlist;
-		     skbinlist = skbinlist->next) {
-			c = visor_copy_fragsinfo_from_skb(skbinlist,
-							  skbinlist->len -
-							  skbinlist->data_len,
-							  frags_max - count,
-							  &frags[count]);
-			if (c < 0)
-				return c;
-			count += c;
-		}
-	}
-	return count;
-}
-
-static ssize_t enable_ints_write(struct file *file,
-				 const char __user *buffer,
-				 size_t count, loff_t *ppos)
-{
-	/* Don't want to break ABI here by having a debugfs
-	 * file that no longer exists or is writable, so
-	 * lets just make this a vestigual function
-	 */
-	return count;
-}
-
-static const struct file_operations debugfs_enable_ints_fops = {
-	.write = enable_ints_write,
-};
-
-/* visornic_serverdown_complete - pause device following IOPART going down
- * @devdata: Device managed by IOPART.
- *
- * The IO partition has gone down, and we need to do some cleanup for when it
- * comes back. Treat the IO partition as the link being down.
- */
-static void visornic_serverdown_complete(struct visornic_devdata *devdata)
-{
-	struct net_device *netdev = devdata->netdev;
-
-	/* Stop polling for interrupts */
-	visorbus_disable_channel_interrupts(devdata->dev);
-
-	rtnl_lock();
-	dev_close(netdev);
-	rtnl_unlock();
-
-	atomic_set(&devdata->num_rcvbuf_in_iovm, 0);
-	devdata->chstat.sent_xmit = 0;
-	devdata->chstat.got_xmit_done = 0;
-
-	if (devdata->server_down_complete_func)
-		(*devdata->server_down_complete_func)(devdata->dev, 0);
-
-	devdata->server_down = true;
-	devdata->server_change_state = false;
-	devdata->server_down_complete_func = NULL;
-}
-
-/* visornic_serverdown - Command has notified us that IOPART is down
- * @devdata:	   Device managed by IOPART.
- * @complete_func: Function to call when finished.
- *
- * Schedule the work needed to handle the server down request. Make sure we
- * haven't already handled the server change state event.
- *
- * Return: 0 if we scheduled the work, negative integer on error.
- */
-static int visornic_serverdown(struct visornic_devdata *devdata,
-			       visorbus_state_complete_func complete_func)
-{
-	unsigned long flags;
-	int err;
-
-	spin_lock_irqsave(&devdata->priv_lock, flags);
-	if (devdata->server_change_state) {
-		dev_dbg(&devdata->dev->device, "%s changing state\n",
-			__func__);
-		err = -EINVAL;
-		goto err_unlock;
-	}
-	if (devdata->server_down) {
-		dev_dbg(&devdata->dev->device, "%s already down\n",
-			__func__);
-		err = -EINVAL;
-		goto err_unlock;
-	}
-	if (devdata->going_away) {
-		dev_dbg(&devdata->dev->device,
-			"%s aborting because device removal pending\n",
-			__func__);
-		err = -ENODEV;
-		goto err_unlock;
-	}
-	devdata->server_change_state = true;
-	devdata->server_down_complete_func = complete_func;
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-
-	visornic_serverdown_complete(devdata);
-	return 0;
-
-err_unlock:
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-	return err;
-}
-
-/* alloc_rcv_buf - alloc rcv buffer to be given to the IO Partition
- * @netdev: Network adapter the rcv bufs are attached too.
- *
- * Create an sk_buff (rcv_buf) that will be passed to the IO Partition
- * so that it can write rcv data into our memory space.
- *
- * Return: Pointer to sk_buff.
- */
-static struct sk_buff *alloc_rcv_buf(struct net_device *netdev)
-{
-	struct sk_buff *skb;
-
-	/* NOTE: the first fragment in each rcv buffer is pointed to by
-	 * rcvskb->data. For now all rcv buffers will be RCVPOST_BUF_SIZE
-	 * in length, so the first frag is large enough to hold 1514.
-	 */
-	skb = alloc_skb(RCVPOST_BUF_SIZE, GFP_ATOMIC);
-	if (!skb)
-		return NULL;
-	skb->dev = netdev;
-	/* current value of mtu doesn't come into play here; large
-	 * packets will just end up using multiple rcv buffers all of
-	 * same size.
-	 */
-	skb->len = RCVPOST_BUF_SIZE;
-	/* alloc_skb already zeroes it out for clarification. */
-	skb->data_len = 0;
-	return skb;
-}
-
-/* post_skb - post a skb to the IO Partition
- * @cmdrsp:  Cmdrsp packet to be send to the IO Partition.
- * @devdata: visornic_devdata to post the skb to.
- * @skb:     Skb to give to the IO partition.
- *
- * Return: 0 on success, negative integer on error.
- */
-static int post_skb(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata,
-		    struct sk_buff *skb)
-{
-	int err;
-
-	cmdrsp->net.buf = skb;
-	cmdrsp->net.rcvpost.frag.pi_pfn = page_to_pfn(virt_to_page(skb->data));
-	cmdrsp->net.rcvpost.frag.pi_off =
-		(unsigned long)skb->data & PI_PAGE_MASK;
-	cmdrsp->net.rcvpost.frag.pi_len = skb->len;
-	cmdrsp->net.rcvpost.unique_num = devdata->incarnation_id;
-
-	if ((cmdrsp->net.rcvpost.frag.pi_off + skb->len) > PI_PAGE_SIZE)
-		return -EINVAL;
-
-	cmdrsp->net.type = NET_RCV_POST;
-	cmdrsp->cmdtype = CMD_NET_TYPE;
-	err = visorchannel_signalinsert(devdata->dev->visorchannel,
-					IOCHAN_TO_IOPART,
-					cmdrsp);
-	if (err) {
-		devdata->chstat.sent_post_failed++;
-		return err;
-	}
-
-	atomic_inc(&devdata->num_rcvbuf_in_iovm);
-	devdata->chstat.sent_post++;
-	return 0;
-}
-
-/* send_enbdis - Send NET_RCV_ENBDIS to IO Partition
- * @netdev:  Netdevice we are enabling/disabling, used as context return value.
- * @state:   Enable = 1/disable = 0.
- * @devdata: Visornic device we are enabling/disabling.
- *
- * Send the enable/disable message to the IO Partition.
- *
- * Return: 0 on success, negative integer on error.
- */
-static int send_enbdis(struct net_device *netdev, int state,
-		       struct visornic_devdata *devdata)
-{
-	int err;
-
-	devdata->cmdrsp_rcv->net.enbdis.enable = state;
-	devdata->cmdrsp_rcv->net.enbdis.context = netdev;
-	devdata->cmdrsp_rcv->net.type = NET_RCV_ENBDIS;
-	devdata->cmdrsp_rcv->cmdtype = CMD_NET_TYPE;
-	err = visorchannel_signalinsert(devdata->dev->visorchannel,
-					IOCHAN_TO_IOPART,
-					devdata->cmdrsp_rcv);
-	if (err)
-		return err;
-	devdata->chstat.sent_enbdis++;
-	return 0;
-}
-
-/* visornic_disable_with_timeout - disable network adapter
- * @netdev:  netdevice to disable.
- * @timeout: Timeout to wait for disable.
- *
- * Disable the network adapter and inform the IO Partition that we are disabled.
- * Reclaim memory from rcv bufs.
- *
- * Return: 0 on success, negative integer on failure of IO Partition responding.
- */
-static int visornic_disable_with_timeout(struct net_device *netdev,
-					 const int timeout)
-{
-	struct visornic_devdata *devdata = netdev_priv(netdev);
-	int i;
-	unsigned long flags;
-	int wait = 0;
-	int err;
-
-	/* send a msg telling the other end we are stopping incoming pkts */
-	spin_lock_irqsave(&devdata->priv_lock, flags);
-	devdata->enabled = 0;
-	/* must wait for ack */
-	devdata->enab_dis_acked = 0;
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-
-	/* send disable and wait for ack -- don't hold lock when sending
-	 * disable because if the queue is full, insert might sleep.
-	 * If an error occurs, don't wait for the timeout.
-	 */
-	err = send_enbdis(netdev, 0, devdata);
-	if (err)
-		return err;
-
-	/* wait for ack to arrive before we try to free rcv buffers
-	 * NOTE: the other end automatically unposts the rcv buffers
-	 * when it gets a disable.
-	 */
-	spin_lock_irqsave(&devdata->priv_lock, flags);
-	while ((timeout == VISORNIC_INFINITE_RSP_WAIT) ||
-	       (wait < timeout)) {
-		if (devdata->enab_dis_acked)
-			break;
-		if (devdata->server_down || devdata->server_change_state) {
-			dev_dbg(&netdev->dev, "%s server went away\n",
-				__func__);
-			break;
-		}
-		set_current_state(TASK_INTERRUPTIBLE);
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		wait += schedule_timeout(msecs_to_jiffies(10));
-		spin_lock_irqsave(&devdata->priv_lock, flags);
-	}
-
-	/* Wait for usage to go to 1 (no other users) before freeing
-	 * rcv buffers
-	 */
-	if (atomic_read(&devdata->usage) > 1) {
-		while (1) {
-			set_current_state(TASK_INTERRUPTIBLE);
-			spin_unlock_irqrestore(&devdata->priv_lock, flags);
-			schedule_timeout(msecs_to_jiffies(10));
-			spin_lock_irqsave(&devdata->priv_lock, flags);
-			if (atomic_read(&devdata->usage))
-				break;
-		}
-	}
-	/* we've set enabled to 0, so we can give up the lock. */
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-
-	/* stop the transmit queue so nothing more can be transmitted */
-	netif_stop_queue(netdev);
-
-	napi_disable(&devdata->napi);
-
-	skb_queue_purge(&devdata->xmitbufhead);
-
-	/* Free rcv buffers - other end has automatically unposed them on
-	 * disable
-	 */
-	for (i = 0; i < devdata->num_rcv_bufs; i++) {
-		if (devdata->rcvbuf[i]) {
-			kfree_skb(devdata->rcvbuf[i]);
-			devdata->rcvbuf[i] = NULL;
-		}
-	}
-
-	return 0;
-}
-
-/* init_rcv_bufs - initialize receive buffs and send them to the IO Partition
- * @netdev:  struct netdevice.
- * @devdata: visornic_devdata.
- *
- * Allocate rcv buffers and post them to the IO Partition.
- *
- * Return: 0 on success, negative integer on failure.
- */
-static int init_rcv_bufs(struct net_device *netdev,
-			 struct visornic_devdata *devdata)
-{
-	int i, j, count, err;
-
-	/* allocate fixed number of receive buffers to post to uisnic
-	 * post receive buffers after we've allocated a required amount
-	 */
-	for (i = 0; i < devdata->num_rcv_bufs; i++) {
-		devdata->rcvbuf[i] = alloc_rcv_buf(netdev);
-		/* if we failed to allocate one let us stop */
-		if (!devdata->rcvbuf[i])
-			break;
-	}
-	/* couldn't even allocate one -- bail out */
-	if (i == 0)
-		return -ENOMEM;
-	count = i;
-
-	/* Ensure we can alloc 2/3rd of the requested number of buffers.
-	 * 2/3 is an arbitrary choice; used also in ndis init.c
-	 */
-	if (count < ((2 * devdata->num_rcv_bufs) / 3)) {
-		/* free receive buffers we did alloc and then bail out */
-		for (i = 0; i < count; i++) {
-			kfree_skb(devdata->rcvbuf[i]);
-			devdata->rcvbuf[i] = NULL;
-		}
-		return -ENOMEM;
-	}
-
-	/* post receive buffers to receive incoming input - without holding
-	 * lock - we've not enabled nor started the queue so there shouldn't
-	 * be any rcv or xmit activity
-	 */
-	for (i = 0; i < count; i++) {
-		err = post_skb(devdata->cmdrsp_rcv, devdata,
-			       devdata->rcvbuf[i]);
-		if (!err)
-			continue;
-
-		/* Error handling -
-		 * If we posted at least one skb, we should return success,
-		 * but need to free the resources that we have not successfully
-		 * posted.
-		 */
-		for (j = i; j < count; j++) {
-			kfree_skb(devdata->rcvbuf[j]);
-			devdata->rcvbuf[j] = NULL;
-		}
-		if (i == 0)
-			return err;
-		break;
-	}
-
-	return 0;
-}
-
-/* visornic_enable_with_timeout	- send enable to IO Partition
- * @netdev:  struct net_device.
- * @timeout: Time to wait for the ACK from the enable.
- *
- * Sends enable to IOVM and inits, and posts receive buffers to IOVM. Timeout is
- * defined in msecs (timeout of 0 specifies infinite wait).
- *
- * Return: 0 on success, negative integer on failure.
- */
-static int visornic_enable_with_timeout(struct net_device *netdev,
-					const int timeout)
-{
-	int err = 0;
-	struct visornic_devdata *devdata = netdev_priv(netdev);
-	unsigned long flags;
-	int wait = 0;
-
-	napi_enable(&devdata->napi);
-
-	/* NOTE: the other end automatically unposts the rcv buffers when it
-	 * gets a disable.
-	 */
-	err = init_rcv_bufs(netdev, devdata);
-	if (err < 0) {
-		dev_err(&netdev->dev,
-			"%s failed to init rcv bufs\n", __func__);
-		return err;
-	}
-
-	spin_lock_irqsave(&devdata->priv_lock, flags);
-	devdata->enabled = 1;
-	devdata->enab_dis_acked = 0;
-
-	/* now we're ready, let's send an ENB to uisnic but until we get
-	 * an ACK back from uisnic, we'll drop the packets
-	 */
-	devdata->n_rcv_packets_not_accepted = 0;
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-
-	/* send enable and wait for ack -- don't hold lock when sending enable
-	 * because if the queue is full, insert might sleep. If an error
-	 * occurs error out.
-	 */
-	err = send_enbdis(netdev, 1, devdata);
-	if (err)
-		return err;
-
-	spin_lock_irqsave(&devdata->priv_lock, flags);
-	while ((timeout == VISORNIC_INFINITE_RSP_WAIT) ||
-	       (wait < timeout)) {
-		if (devdata->enab_dis_acked)
-			break;
-		if (devdata->server_down || devdata->server_change_state) {
-			dev_dbg(&netdev->dev, "%s server went away\n",
-				__func__);
-			break;
-		}
-		set_current_state(TASK_INTERRUPTIBLE);
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		wait += schedule_timeout(msecs_to_jiffies(10));
-		spin_lock_irqsave(&devdata->priv_lock, flags);
-	}
-
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-
-	if (!devdata->enab_dis_acked) {
-		dev_err(&netdev->dev, "%s missing ACK\n", __func__);
-		return -EIO;
-	}
-
-	netif_start_queue(netdev);
-	return 0;
-}
-
-/* visornic_timeout_reset - handle xmit timeout resets
- * @work: Work item that scheduled the work.
- *
- * Transmit timeouts are typically handled by resetting the device for our
- * virtual NIC; we will send a disable and enable to the IOVM. If it doesn't
- * respond, we will trigger a serverdown.
- */
-static void visornic_timeout_reset(struct work_struct *work)
-{
-	struct visornic_devdata *devdata;
-	struct net_device *netdev;
-	int response = 0;
-
-	devdata = container_of(work, struct visornic_devdata, timeout_reset);
-	netdev = devdata->netdev;
-
-	rtnl_lock();
-	if (!netif_running(netdev)) {
-		rtnl_unlock();
-		return;
-	}
-
-	response = visornic_disable_with_timeout(netdev,
-						 VISORNIC_INFINITE_RSP_WAIT);
-	if (response)
-		goto call_serverdown;
-
-	response = visornic_enable_with_timeout(netdev,
-						VISORNIC_INFINITE_RSP_WAIT);
-	if (response)
-		goto call_serverdown;
-
-	rtnl_unlock();
-
-	return;
-
-call_serverdown:
-	visornic_serverdown(devdata, NULL);
-	rtnl_unlock();
-}
-
-/* visornic_open - enable the visornic device and mark the queue started
- * @netdev: netdevice to start.
- *
- * Enable the device and start the transmit queue.
- *
- * Return: 0 on success.
- */
-static int visornic_open(struct net_device *netdev)
-{
-	visornic_enable_with_timeout(netdev, VISORNIC_INFINITE_RSP_WAIT);
-	return 0;
-}
-
-/* visornic_close - disables the visornic device and stops the queues
- * @netdev: netdevice to stop.
- *
- * Disable the device and stop the transmit queue.
- *
- * Return 0 on success.
- */
-static int visornic_close(struct net_device *netdev)
-{
-	visornic_disable_with_timeout(netdev, VISORNIC_INFINITE_RSP_WAIT);
-	return 0;
-}
-
-/* devdata_xmits_outstanding - compute outstanding xmits
- * @devdata: visornic_devdata for device
- *
- * Return: Long integer representing the number of outstanding xmits.
- */
-static unsigned long devdata_xmits_outstanding(struct visornic_devdata *devdata)
-{
-	if (devdata->chstat.sent_xmit >= devdata->chstat.got_xmit_done)
-		return devdata->chstat.sent_xmit -
-			devdata->chstat.got_xmit_done;
-	return (ULONG_MAX - devdata->chstat.got_xmit_done
-		+ devdata->chstat.sent_xmit + 1);
-}
-
-/* vnic_hit_high_watermark
- * @devdata:	    Indicates visornic device we are checking.
- * @high_watermark: Max num of unacked xmits we will tolerate before we will
- *		    start throttling.
- *
- * Return: True iff the number of unacked xmits sent to the IO Partition is >=
- *	   high_watermark. False otherwise.
- */
-static bool vnic_hit_high_watermark(struct visornic_devdata *devdata,
-				    ulong high_watermark)
-{
-	return (devdata_xmits_outstanding(devdata) >= high_watermark);
-}
-
-/* vnic_hit_low_watermark
- * @devdata:	   Indicates visornic device we are checking.
- * @low_watermark: We will wait until the num of unacked xmits drops to this
- *		   value or lower before we start transmitting again.
- *
- * Return: True iff the number of unacked xmits sent to the IO Partition is <=
- *	   low_watermark.
- */
-static bool vnic_hit_low_watermark(struct visornic_devdata *devdata,
-				   ulong low_watermark)
-{
-	return (devdata_xmits_outstanding(devdata) <= low_watermark);
-}
-
-/* visornic_xmit - send a packet to the IO Partition
- * @skb:    Packet to be sent.
- * @netdev: Net device the packet is being sent from.
- *
- * Convert the skb to a cmdrsp so the IO Partition can understand it, and send
- * the XMIT command to the IO Partition for processing. This function is
- * protected from concurrent calls by a spinlock xmit_lock in the net_device
- * struct. As soon as the function returns, it can be called again.
- *
- * Return: NETDEV_TX_OK.
- */
-static netdev_tx_t visornic_xmit(struct sk_buff *skb, struct net_device *netdev)
-{
-	struct visornic_devdata *devdata;
-	int len, firstfraglen, padlen;
-	struct uiscmdrsp *cmdrsp = NULL;
-	unsigned long flags;
-	int err;
-
-	devdata = netdev_priv(netdev);
-	spin_lock_irqsave(&devdata->priv_lock, flags);
-
-	if (netif_queue_stopped(netdev) || devdata->server_down ||
-	    devdata->server_change_state) {
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		devdata->busy_cnt++;
-		dev_dbg(&netdev->dev,
-			"%s busy - queue stopped\n", __func__);
-		kfree_skb(skb);
-		return NETDEV_TX_OK;
-	}
-
-	/* sk_buff struct is used to host network data throughout all the
-	 * linux network subsystems
-	 */
-	len = skb->len;
-
-	/* skb->len is the FULL length of data (including fragmentary portion)
-	 * skb->data_len is the length of the fragment portion in frags
-	 * skb->len - skb->data_len is size of the 1st fragment in skb->data
-	 * calculate the length of the first fragment that skb->data is
-	 * pointing to
-	 */
-	firstfraglen = skb->len - skb->data_len;
-	if (firstfraglen < ETH_HLEN) {
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		devdata->busy_cnt++;
-		dev_err(&netdev->dev,
-			"%s busy - first frag too small (%d)\n",
-			__func__, firstfraglen);
-		kfree_skb(skb);
-		return NETDEV_TX_OK;
-	}
-
-	if (len < ETH_MIN_PACKET_SIZE &&
-	    ((skb_end_pointer(skb) - skb->data) >= ETH_MIN_PACKET_SIZE)) {
-		/* pad the packet out to minimum size */
-		padlen = ETH_MIN_PACKET_SIZE - len;
-		skb_put_zero(skb, padlen);
-		len += padlen;
-		firstfraglen += padlen;
-	}
-
-	cmdrsp = devdata->xmit_cmdrsp;
-	/* clear cmdrsp */
-	memset(cmdrsp, 0, SIZEOF_CMDRSP);
-	cmdrsp->net.type = NET_XMIT;
-	cmdrsp->cmdtype = CMD_NET_TYPE;
-
-	/* save the pointer to skb -- we'll need it for completion */
-	cmdrsp->net.buf = skb;
-
-	if (vnic_hit_high_watermark(devdata,
-				    devdata->max_outstanding_net_xmits)) {
-		/* extra NET_XMITs queued over to IOVM - need to wait */
-		devdata->chstat.reject_count++;
-		if (!devdata->queuefullmsg_logged &&
-		    ((devdata->chstat.reject_count & 0x3ff) == 1))
-			devdata->queuefullmsg_logged = 1;
-		netif_stop_queue(netdev);
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		devdata->busy_cnt++;
-		dev_dbg(&netdev->dev,
-			"%s busy - waiting for iovm to catch up\n",
-			__func__);
-		kfree_skb(skb);
-		return NETDEV_TX_OK;
-	}
-	if (devdata->queuefullmsg_logged)
-		devdata->queuefullmsg_logged = 0;
-
-	if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
-		cmdrsp->net.xmt.lincsum.valid = 1;
-		cmdrsp->net.xmt.lincsum.protocol = skb->protocol;
-		if (skb_transport_header(skb) > skb->data) {
-			cmdrsp->net.xmt.lincsum.hrawoff =
-				skb_transport_header(skb) - skb->data;
-			cmdrsp->net.xmt.lincsum.hrawoff = 1;
-		}
-		if (skb_network_header(skb) > skb->data) {
-			cmdrsp->net.xmt.lincsum.nhrawoff =
-				skb_network_header(skb) - skb->data;
-			cmdrsp->net.xmt.lincsum.nhrawoffv = 1;
-		}
-		cmdrsp->net.xmt.lincsum.csum = skb->csum;
-	} else {
-		cmdrsp->net.xmt.lincsum.valid = 0;
-	}
-
-	/* save off the length of the entire data packet */
-	cmdrsp->net.xmt.len = len;
-
-	/* copy ethernet header from first frag into ocmdrsp
-	 * - everything else will be pass in frags & DMA'ed
-	 */
-	memcpy(cmdrsp->net.xmt.ethhdr, skb->data, ETH_HLEN);
-
-	/* copy frags info - from skb->data we need to only provide access
-	 * beyond eth header
-	 */
-	cmdrsp->net.xmt.num_frags =
-		visor_copy_fragsinfo_from_skb(skb, firstfraglen,
-					      MAX_PHYS_INFO,
-					      cmdrsp->net.xmt.frags);
-	if (cmdrsp->net.xmt.num_frags < 0) {
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		devdata->busy_cnt++;
-		dev_err(&netdev->dev,
-			"%s busy - copy frags failed\n", __func__);
-		kfree_skb(skb);
-		return NETDEV_TX_OK;
-	}
-
-	err = visorchannel_signalinsert(devdata->dev->visorchannel,
-					IOCHAN_TO_IOPART, cmdrsp);
-	if (err) {
-		netif_stop_queue(netdev);
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		devdata->busy_cnt++;
-		dev_dbg(&netdev->dev,
-			"%s busy - signalinsert failed\n", __func__);
-		kfree_skb(skb);
-		return NETDEV_TX_OK;
-	}
-
-	/* Track the skbs that have been sent to the IOVM for XMIT */
-	skb_queue_head(&devdata->xmitbufhead, skb);
-
-	/* update xmt stats */
-	devdata->net_stats.tx_packets++;
-	devdata->net_stats.tx_bytes += skb->len;
-	devdata->chstat.sent_xmit++;
-
-	/* check if we have hit the high watermark for netif_stop_queue() */
-	if (vnic_hit_high_watermark(devdata,
-				    devdata->upper_threshold_net_xmits)) {
-		/* extra NET_XMITs queued over to IOVM - need to wait */
-		/* stop queue - call netif_wake_queue() after lower threshold */
-		netif_stop_queue(netdev);
-		dev_dbg(&netdev->dev,
-			"%s busy - invoking iovm flow control\n",
-			__func__);
-		devdata->flow_control_upper_hits++;
-	}
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-
-	/* skb will be freed when we get back NET_XMIT_DONE */
-	return NETDEV_TX_OK;
-}
-
-/* visornic_get_stats - returns net_stats of the visornic device
- * @netdev: netdevice.
- *
- * Return: Pointer to the net_device_stats struct for the device.
- */
-static struct net_device_stats *visornic_get_stats(struct net_device *netdev)
-{
-	struct visornic_devdata *devdata = netdev_priv(netdev);
-
-	return &devdata->net_stats;
-}
-
-/* visornic_change_mtu - changes mtu of device
- * @netdev: netdevice.
- * @new_mtu: Value of new mtu.
- *
- * The device's MTU cannot be changed by system; it must be changed via a
- * CONTROLVM message. All vnics and pnics in a switch have to have the same MTU
- * for everything to work. Currently not supported.
- *
- * Return: -EINVAL.
- */
-static int visornic_change_mtu(struct net_device *netdev, int new_mtu)
-{
-	return -EINVAL;
-}
-
-/* visornic_set_multi - set visornic device flags
- * @netdev: netdevice.
- *
- * The only flag we currently support is IFF_PROMISC.
- */
-static void visornic_set_multi(struct net_device *netdev)
-{
-	struct uiscmdrsp *cmdrsp;
-	struct visornic_devdata *devdata = netdev_priv(netdev);
-	int err = 0;
-
-	if (devdata->old_flags == netdev->flags)
-		return;
-
-	if ((netdev->flags & IFF_PROMISC) ==
-	    (devdata->old_flags & IFF_PROMISC))
-		goto out_save_flags;
-
-	cmdrsp = kmalloc(SIZEOF_CMDRSP, GFP_ATOMIC);
-	if (!cmdrsp)
-		return;
-	cmdrsp->cmdtype = CMD_NET_TYPE;
-	cmdrsp->net.type = NET_RCV_PROMISC;
-	cmdrsp->net.enbdis.context = netdev;
-	cmdrsp->net.enbdis.enable =
-		netdev->flags & IFF_PROMISC;
-	err = visorchannel_signalinsert(devdata->dev->visorchannel,
-					IOCHAN_TO_IOPART,
-					cmdrsp);
-	kfree(cmdrsp);
-	if (err)
-		return;
-
-out_save_flags:
-	devdata->old_flags = netdev->flags;
-}
-
-/* visornic_xmit_timeout - request to timeout the xmit
- * @netdev: netdevice.
- *
- * Queue the work and return. Make sure we have not already been informed that
- * the IO Partition is gone; if so, we will have already timed-out the xmits.
- */
-static void visornic_xmit_timeout(struct net_device *netdev, unsigned int txqueue)
-{
-	struct visornic_devdata *devdata = netdev_priv(netdev);
-	unsigned long flags;
-
-	spin_lock_irqsave(&devdata->priv_lock, flags);
-	if (devdata->going_away) {
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		dev_dbg(&devdata->dev->device,
-			"%s aborting because device removal pending\n",
-			__func__);
-		return;
-	}
-
-	/* Ensure that a ServerDown message hasn't been received */
-	if (!devdata->enabled ||
-	    (devdata->server_down && !devdata->server_change_state)) {
-		dev_dbg(&netdev->dev, "%s no processing\n",
-			__func__);
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		return;
-	}
-	schedule_work(&devdata->timeout_reset);
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-}
-
-/* repost_return - repost rcv bufs that have come back
- * @cmdrsp: IO channel command struct to post.
- * @devdata: Visornic devdata for the device.
- * @skb: Socket buffer.
- * @netdev: netdevice.
- *
- * Repost rcv buffers that have been returned to us when we are finished
- * with them.
- *
- * Return: 0 for success, negative integer on error.
- */
-static int repost_return(struct uiscmdrsp *cmdrsp,
-			 struct visornic_devdata *devdata,
-			 struct sk_buff *skb, struct net_device *netdev)
-{
-	struct net_pkt_rcv copy;
-	int i = 0, cc, numreposted;
-	int found_skb = 0;
-	int status = 0;
-
-	copy = cmdrsp->net.rcv;
-	switch (copy.numrcvbufs) {
-	case 0:
-		devdata->n_rcv0++;
-		break;
-	case 1:
-		devdata->n_rcv1++;
-		break;
-	case 2:
-		devdata->n_rcv2++;
-		break;
-	default:
-		devdata->n_rcvx++;
-		break;
-	}
-	for (cc = 0, numreposted = 0; cc < copy.numrcvbufs; cc++) {
-		for (i = 0; i < devdata->num_rcv_bufs; i++) {
-			if (devdata->rcvbuf[i] != copy.rcvbuf[cc])
-				continue;
-
-			if ((skb) && devdata->rcvbuf[i] == skb) {
-				devdata->found_repost_rcvbuf_cnt++;
-				found_skb = 1;
-				devdata->repost_found_skb_cnt++;
-			}
-			devdata->rcvbuf[i] = alloc_rcv_buf(netdev);
-			if (!devdata->rcvbuf[i]) {
-				devdata->num_rcv_bufs_could_not_alloc++;
-				devdata->alloc_failed_in_repost_rtn_cnt++;
-				status = -ENOMEM;
-				break;
-			}
-			status = post_skb(cmdrsp, devdata, devdata->rcvbuf[i]);
-			if (status) {
-				kfree_skb(devdata->rcvbuf[i]);
-				devdata->rcvbuf[i] = NULL;
-				break;
-			}
-			numreposted++;
-			break;
-		}
-	}
-	if (numreposted != copy.numrcvbufs) {
-		devdata->n_repost_deficit++;
-		status = -EINVAL;
-	}
-	if (skb) {
-		if (found_skb) {
-			kfree_skb(skb);
-		} else {
-			status = -EINVAL;
-			devdata->bad_rcv_buf++;
-		}
-	}
-	return status;
-}
-
-/* visornic_rx - handle receive packets coming back from IO Partition
- * @cmdrsp: Receive packet returned from IO Partition.
- *
- * Got a receive packet back from the IO Partition; handle it and send it up
- * the stack.
-
- * Return: 1 iff an skb was received, otherwise 0.
- */
-static int visornic_rx(struct uiscmdrsp *cmdrsp)
-{
-	struct visornic_devdata *devdata;
-	struct sk_buff *skb, *prev, *curr;
-	struct net_device *netdev;
-	int cc, currsize, off;
-	struct ethhdr *eth;
-	unsigned long flags;
-
-	/* post new rcv buf to the other end using the cmdrsp we have at hand
-	 * post it without holding lock - but we'll use the signal lock to
-	 * synchronize the queue insert the cmdrsp that contains the net.rcv
-	 * is the one we are using to repost, so copy the info we need from it.
-	 */
-	skb = cmdrsp->net.buf;
-	netdev = skb->dev;
-
-	devdata = netdev_priv(netdev);
-
-	spin_lock_irqsave(&devdata->priv_lock, flags);
-	atomic_dec(&devdata->num_rcvbuf_in_iovm);
-
-	/* set length to how much was ACTUALLY received -
-	 * NOTE: rcv_done_len includes actual length of data rcvd
-	 * including ethhdr
-	 */
-	skb->len = cmdrsp->net.rcv.rcv_done_len;
-
-	/* update rcv stats - call it with priv_lock held */
-	devdata->net_stats.rx_packets++;
-	devdata->net_stats.rx_bytes += skb->len;
-
-	/* test enabled while holding lock */
-	if (!(devdata->enabled && devdata->enab_dis_acked)) {
-		/* don't process it unless we're in enable mode and until
-		 * we've gotten an ACK saying the other end got our RCV enable
-		 */
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		repost_return(cmdrsp, devdata, skb, netdev);
-		return 0;
-	}
-
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-
-	/* when skb was allocated, skb->dev, skb->data, skb->len and
-	 * skb->data_len were setup. AND, data has already put into the
-	 * skb (both first frag and in frags pages)
-	 * NOTE: firstfragslen is the amount of data in skb->data and that
-	 * which is not in nr_frags or frag_list. This is now simply
-	 * RCVPOST_BUF_SIZE. bump tail to show how much data is in
-	 * firstfrag & set data_len to show rest see if we have to chain
-	 * frag_list.
-	 */
-	/* do PRECAUTIONARY check */
-	if (skb->len > RCVPOST_BUF_SIZE) {
-		if (cmdrsp->net.rcv.numrcvbufs < 2) {
-			if (repost_return(cmdrsp, devdata, skb, netdev) < 0)
-				dev_err(&devdata->netdev->dev,
-					"repost_return failed");
-			return 0;
-		}
-		/* length rcvd is greater than firstfrag in this skb rcv buf  */
-		/* amount in skb->data */
-		skb->tail += RCVPOST_BUF_SIZE;
-		/* amount that will be in frag_list */
-		skb->data_len = skb->len - RCVPOST_BUF_SIZE;
-	} else {
-		/* data fits in this skb - no chaining - do
-		 * PRECAUTIONARY check
-		 */
-		/* should be 1 */
-		if (cmdrsp->net.rcv.numrcvbufs != 1) {
-			if (repost_return(cmdrsp, devdata, skb, netdev) < 0)
-				dev_err(&devdata->netdev->dev,
-					"repost_return failed");
-			return 0;
-		}
-		skb->tail += skb->len;
-		/* nothing rcvd in frag_list */
-		skb->data_len = 0;
-	}
-	off = skb_tail_pointer(skb) - skb->data;
-
-	/* amount we bumped tail by in the head skb
-	 * it is used to calculate the size of each chained skb below
-	 * it is also used to index into bufline to continue the copy
-	 * (for chansocktwopc)
-	 * if necessary chain the rcv skbs together.
-	 * NOTE: index 0 has the same as cmdrsp->net.rcv.skb; we need to
-	 * chain the rest to that one.
-	 * - do PRECAUTIONARY check
-	 */
-	if (cmdrsp->net.rcv.rcvbuf[0] != skb) {
-		if (repost_return(cmdrsp, devdata, skb, netdev) < 0)
-			dev_err(&devdata->netdev->dev, "repost_return failed");
-		return 0;
-	}
-
-	if (cmdrsp->net.rcv.numrcvbufs > 1) {
-		/* chain the various rcv buffers into the skb's frag_list. */
-		/* Note: off was initialized above  */
-		for (cc = 1, prev = NULL;
-		     cc < cmdrsp->net.rcv.numrcvbufs; cc++) {
-			curr = (struct sk_buff *)cmdrsp->net.rcv.rcvbuf[cc];
-			curr->next = NULL;
-			/* start of list- set head */
-			if (!prev)
-				skb_shinfo(skb)->frag_list = curr;
-			else
-				prev->next = curr;
-			prev = curr;
-
-			/* should we set skb->len and skb->data_len for each
-			 * buffer being chained??? can't hurt!
-			 */
-			currsize = min(skb->len - off,
-				       (unsigned int)RCVPOST_BUF_SIZE);
-			curr->len = currsize;
-			curr->tail += currsize;
-			curr->data_len = 0;
-			off += currsize;
-		}
-		/* assert skb->len == off */
-		if (skb->len != off) {
-			netdev_err(devdata->netdev,
-				   "something wrong; skb->len:%d != off:%d\n",
-				   skb->len, off);
-		}
-	}
-
-	/* set up packet's protocol type using ethernet header - this
-	 * sets up skb->pkt_type & it also PULLS out the eth header
-	 */
-	skb->protocol = eth_type_trans(skb, netdev);
-	eth = eth_hdr(skb);
-	skb->csum = 0;
-	skb->ip_summed = CHECKSUM_NONE;
-
-	do {
-		/* accept all packets */
-		if (netdev->flags & IFF_PROMISC)
-			break;
-		if (skb->pkt_type == PACKET_BROADCAST) {
-			/* accept all broadcast packets */
-			if (netdev->flags & IFF_BROADCAST)
-				break;
-		} else if (skb->pkt_type == PACKET_MULTICAST) {
-			if ((netdev->flags & IFF_MULTICAST) &&
-			    (netdev_mc_count(netdev))) {
-				struct netdev_hw_addr *ha;
-				int found_mc = 0;
-
-				/* only accept multicast packets that we can
-				 * find in our multicast address list
-				 */
-				netdev_for_each_mc_addr(ha, netdev) {
-					if (ether_addr_equal(eth->h_dest,
-							     ha->addr)) {
-						found_mc = 1;
-						break;
-					}
-				}
-				/* accept pkt, dest matches a multicast addr */
-				if (found_mc)
-					break;
-			}
-		/* accept packet, h_dest must match vnic  mac address */
-		} else if (skb->pkt_type == PACKET_HOST) {
-			break;
-		} else if (skb->pkt_type == PACKET_OTHERHOST) {
-			/* something is not right */
-			dev_err(&devdata->netdev->dev,
-				"**** FAILED to deliver rcv packet to OS; name:%s Dest:%pM VNIC:%pM\n",
-				netdev->name, eth->h_dest, netdev->dev_addr);
-		}
-		/* drop packet - don't forward it up to OS */
-		devdata->n_rcv_packets_not_accepted++;
-		repost_return(cmdrsp, devdata, skb, netdev);
-		return 0;
-	} while (0);
-
-	netif_receive_skb(skb);
-	/* netif_rx returns various values, but "in practice most drivers
-	 * ignore the return value
-	 */
-
-	skb = NULL;
-	/* whether the packet got dropped or handled, the skb is freed by
-	 * kernel code, so we shouldn't free it. but we should repost a
-	 * new rcv buffer.
-	 */
-	repost_return(cmdrsp, devdata, skb, netdev);
-	return 1;
-}
-
-/* devdata_initialize - initialize devdata structure
- * @devdata: visornic_devdata structure to initialize.
- * @dev:     visorbus_device it belongs to.
- *
- * Setup initial values for the visornic, based on channel and default values.
- *
- * Return: A pointer to the devdata structure.
- */
-static struct visornic_devdata *devdata_initialize(
-					struct visornic_devdata *devdata,
-					struct visor_device *dev)
-{
-	devdata->dev = dev;
-	devdata->incarnation_id = get_jiffies_64();
-	return devdata;
-}
-
-/* devdata_release - free up references in devdata
- * @devdata: Struct to clean up.
- */
-static void devdata_release(struct visornic_devdata *devdata)
-{
-	kfree(devdata->rcvbuf);
-	kfree(devdata->cmdrsp_rcv);
-	kfree(devdata->xmit_cmdrsp);
-}
-
-static const struct net_device_ops visornic_dev_ops = {
-	.ndo_open = visornic_open,
-	.ndo_stop = visornic_close,
-	.ndo_start_xmit = visornic_xmit,
-	.ndo_get_stats = visornic_get_stats,
-	.ndo_change_mtu = visornic_change_mtu,
-	.ndo_tx_timeout = visornic_xmit_timeout,
-	.ndo_set_rx_mode = visornic_set_multi,
-};
-
-/* DebugFS code */
-static ssize_t info_debugfs_read(struct file *file, char __user *buf,
-				 size_t len, loff_t *offset)
-{
-	ssize_t bytes_read = 0;
-	int str_pos = 0;
-	struct visornic_devdata *devdata;
-	struct net_device *dev;
-	char *vbuf;
-
-	if (len > MAX_BUF)
-		len = MAX_BUF;
-	vbuf = kzalloc(len, GFP_KERNEL);
-	if (!vbuf)
-		return -ENOMEM;
-
-	/* for each vnic channel dump out channel specific data */
-	rcu_read_lock();
-	for_each_netdev_rcu(current->nsproxy->net_ns, dev) {
-		/* Only consider netdevs that are visornic, and are open */
-		if (dev->netdev_ops != &visornic_dev_ops ||
-		    (!netif_queue_stopped(dev)))
-			continue;
-
-		devdata = netdev_priv(dev);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     "netdev = %s (0x%p), MAC Addr %pM\n",
-				     dev->name,
-				     dev,
-				     dev->dev_addr);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     "VisorNic Dev Info = 0x%p\n", devdata);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " num_rcv_bufs = %d\n",
-				     devdata->num_rcv_bufs);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " max_outstanding_next_xmits = %lu\n",
-				    devdata->max_outstanding_net_xmits);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " upper_threshold_net_xmits = %lu\n",
-				     devdata->upper_threshold_net_xmits);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " lower_threshold_net_xmits = %lu\n",
-				     devdata->lower_threshold_net_xmits);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " queuefullmsg_logged = %d\n",
-				     devdata->queuefullmsg_logged);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " chstat.got_rcv = %lu\n",
-				     devdata->chstat.got_rcv);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " chstat.got_enbdisack = %lu\n",
-				     devdata->chstat.got_enbdisack);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " chstat.got_xmit_done = %lu\n",
-				     devdata->chstat.got_xmit_done);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " chstat.xmit_fail = %lu\n",
-				     devdata->chstat.xmit_fail);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " chstat.sent_enbdis = %lu\n",
-				     devdata->chstat.sent_enbdis);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " chstat.sent_promisc = %lu\n",
-				     devdata->chstat.sent_promisc);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " chstat.sent_post = %lu\n",
-				     devdata->chstat.sent_post);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " chstat.sent_post_failed = %lu\n",
-				     devdata->chstat.sent_post_failed);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " chstat.sent_xmit = %lu\n",
-				     devdata->chstat.sent_xmit);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " chstat.reject_count = %lu\n",
-				     devdata->chstat.reject_count);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " chstat.extra_rcvbufs_sent = %lu\n",
-				     devdata->chstat.extra_rcvbufs_sent);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " n_rcv0 = %lu\n", devdata->n_rcv0);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " n_rcv1 = %lu\n", devdata->n_rcv1);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " n_rcv2 = %lu\n", devdata->n_rcv2);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " n_rcvx = %lu\n", devdata->n_rcvx);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " num_rcvbuf_in_iovm = %d\n",
-				     atomic_read(&devdata->num_rcvbuf_in_iovm));
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " alloc_failed_in_if_needed_cnt = %lu\n",
-				     devdata->alloc_failed_in_if_needed_cnt);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " alloc_failed_in_repost_rtn_cnt = %lu\n",
-				     devdata->alloc_failed_in_repost_rtn_cnt);
-		/* str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-		 *		     " inner_loop_limit_reached_cnt = %lu\n",
-		 *		     devdata->inner_loop_limit_reached_cnt);
-		 */
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " found_repost_rcvbuf_cnt = %lu\n",
-				     devdata->found_repost_rcvbuf_cnt);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " repost_found_skb_cnt = %lu\n",
-				     devdata->repost_found_skb_cnt);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " n_repost_deficit = %lu\n",
-				     devdata->n_repost_deficit);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " bad_rcv_buf = %lu\n",
-				     devdata->bad_rcv_buf);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " n_rcv_packets_not_accepted = %lu\n",
-				     devdata->n_rcv_packets_not_accepted);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " interrupts_rcvd = %llu\n",
-				     devdata->interrupts_rcvd);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " interrupts_notme = %llu\n",
-				     devdata->interrupts_notme);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " interrupts_disabled = %llu\n",
-				     devdata->interrupts_disabled);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " busy_cnt = %llu\n",
-				     devdata->busy_cnt);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " flow_control_upper_hits = %llu\n",
-				     devdata->flow_control_upper_hits);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " flow_control_lower_hits = %llu\n",
-				     devdata->flow_control_lower_hits);
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " netif_queue = %s\n",
-				     netif_queue_stopped(devdata->netdev) ?
-				     "stopped" : "running");
-		str_pos += scnprintf(vbuf + str_pos, len - str_pos,
-				     " xmits_outstanding = %lu\n",
-				     devdata_xmits_outstanding(devdata));
-	}
-	rcu_read_unlock();
-	bytes_read = simple_read_from_buffer(buf, len, offset, vbuf, str_pos);
-	kfree(vbuf);
-	return bytes_read;
-}
-
-static struct dentry *visornic_debugfs_dir;
-static const struct file_operations debugfs_info_fops = {
-	.read = info_debugfs_read,
-};
-
-/* send_rcv_posts_if_needed - send receive buffers to the IO Partition.
- * @devdata: Visornic device.
- */
-static void send_rcv_posts_if_needed(struct visornic_devdata *devdata)
-{
-	int i;
-	struct net_device *netdev;
-	struct uiscmdrsp *cmdrsp = devdata->cmdrsp_rcv;
-	int cur_num_rcv_bufs_to_alloc, rcv_bufs_allocated;
-	int err;
-
-	/* don't do this until vnic is marked ready */
-	if (!(devdata->enabled && devdata->enab_dis_acked))
-		return;
-
-	netdev = devdata->netdev;
-	rcv_bufs_allocated = 0;
-	/* this code is trying to prevent getting stuck here forever,
-	 * but still retry it if you can't allocate them all this time.
-	 */
-	cur_num_rcv_bufs_to_alloc = devdata->num_rcv_bufs_could_not_alloc;
-	while (cur_num_rcv_bufs_to_alloc > 0) {
-		cur_num_rcv_bufs_to_alloc--;
-		for (i = 0; i < devdata->num_rcv_bufs; i++) {
-			if (devdata->rcvbuf[i])
-				continue;
-			devdata->rcvbuf[i] = alloc_rcv_buf(netdev);
-			if (!devdata->rcvbuf[i]) {
-				devdata->alloc_failed_in_if_needed_cnt++;
-				break;
-			}
-			rcv_bufs_allocated++;
-			err = post_skb(cmdrsp, devdata, devdata->rcvbuf[i]);
-			if (err) {
-				kfree_skb(devdata->rcvbuf[i]);
-				devdata->rcvbuf[i] = NULL;
-				break;
-			}
-			devdata->chstat.extra_rcvbufs_sent++;
-		}
-	}
-	devdata->num_rcv_bufs_could_not_alloc -= rcv_bufs_allocated;
-}
-
-/* drain_resp_queue - drains and ignores all messages from the resp queue
- * @cmdrsp:  IO channel command response message.
- * @devdata: Visornic device to drain.
- */
-static void drain_resp_queue(struct uiscmdrsp *cmdrsp,
-			     struct visornic_devdata *devdata)
-{
-	while (!visorchannel_signalremove(devdata->dev->visorchannel,
-					  IOCHAN_FROM_IOPART,
-					  cmdrsp))
-		;
-}
-
-/* service_resp_queue - drain the response queue
- * @cmdrsp:  IO channel command response message.
- * @devdata: Visornic device to drain.
- * @rx_work_done:
- * @budget:
- *
- * Drain the response queue of any responses from the IO Partition. Process the
- * responses as we get them.
- */
-static void service_resp_queue(struct uiscmdrsp *cmdrsp,
-			       struct visornic_devdata *devdata,
-			       int *rx_work_done, int budget)
-{
-	unsigned long flags;
-	struct net_device *netdev;
-
-	while (*rx_work_done < budget) {
-		/* TODO: CLIENT ACQUIRE -- Don't really need this at the
-		 * moment
-		 */
-		/* queue empty */
-		if (visorchannel_signalremove(devdata->dev->visorchannel,
-					      IOCHAN_FROM_IOPART,
-					      cmdrsp))
-			break;
-
-		switch (cmdrsp->net.type) {
-		case NET_RCV:
-			devdata->chstat.got_rcv++;
-			/* process incoming packet */
-			*rx_work_done += visornic_rx(cmdrsp);
-			break;
-		case NET_XMIT_DONE:
-			spin_lock_irqsave(&devdata->priv_lock, flags);
-			devdata->chstat.got_xmit_done++;
-			if (cmdrsp->net.xmtdone.xmt_done_result)
-				devdata->chstat.xmit_fail++;
-			/* only call queue wake if we stopped it */
-			netdev = ((struct sk_buff *)cmdrsp->net.buf)->dev;
-			/* ASSERT netdev == vnicinfo->netdev; */
-			if (netdev == devdata->netdev &&
-			    netif_queue_stopped(netdev)) {
-				/* check if we have crossed the lower watermark
-				 * for netif_wake_queue()
-				 */
-				if (vnic_hit_low_watermark
-				    (devdata,
-				     devdata->lower_threshold_net_xmits)) {
-					/* enough NET_XMITs completed
-					 * so can restart netif queue
-					 */
-					netif_wake_queue(netdev);
-					devdata->flow_control_lower_hits++;
-				}
-			}
-			skb_unlink(cmdrsp->net.buf, &devdata->xmitbufhead);
-			spin_unlock_irqrestore(&devdata->priv_lock, flags);
-			kfree_skb(cmdrsp->net.buf);
-			break;
-		case NET_RCV_ENBDIS_ACK:
-			devdata->chstat.got_enbdisack++;
-			netdev = (struct net_device *)
-			cmdrsp->net.enbdis.context;
-			spin_lock_irqsave(&devdata->priv_lock, flags);
-			devdata->enab_dis_acked = 1;
-			spin_unlock_irqrestore(&devdata->priv_lock, flags);
-
-			if (devdata->server_down &&
-			    devdata->server_change_state) {
-				/* Inform Linux that the link is up */
-				devdata->server_down = false;
-				devdata->server_change_state = false;
-				netif_wake_queue(netdev);
-				netif_carrier_on(netdev);
-			}
-			break;
-		case NET_CONNECT_STATUS:
-			netdev = devdata->netdev;
-			if (cmdrsp->net.enbdis.enable == 1) {
-				spin_lock_irqsave(&devdata->priv_lock, flags);
-				devdata->enabled = cmdrsp->net.enbdis.enable;
-				spin_unlock_irqrestore(&devdata->priv_lock,
-						       flags);
-				netif_wake_queue(netdev);
-				netif_carrier_on(netdev);
-			} else {
-				netif_stop_queue(netdev);
-				netif_carrier_off(netdev);
-				spin_lock_irqsave(&devdata->priv_lock, flags);
-				devdata->enabled = cmdrsp->net.enbdis.enable;
-				spin_unlock_irqrestore(&devdata->priv_lock,
-						       flags);
-			}
-			break;
-		default:
-			break;
-		}
-		/* cmdrsp is now available for reuse  */
-	}
-}
-
-static int visornic_poll(struct napi_struct *napi, int budget)
-{
-	struct visornic_devdata *devdata = container_of(napi,
-							struct visornic_devdata,
-							napi);
-	int rx_count = 0;
-
-	send_rcv_posts_if_needed(devdata);
-	service_resp_queue(devdata->cmdrsp, devdata, &rx_count, budget);
-
-	/* If there aren't any more packets to receive stop the poll */
-	if (rx_count < budget)
-		napi_complete_done(napi, rx_count);
-
-	return rx_count;
-}
-
-/* visornic_channel_interrupt	- checks the status of the response queue
- *
- * Main function of the vnic_incoming thread. Periodically check the response
- * queue and drain it if needed.
- */
-static void visornic_channel_interrupt(struct visor_device *dev)
-{
-	struct visornic_devdata *devdata = dev_get_drvdata(&dev->device);
-
-	if (!devdata)
-		return;
-
-	if (!visorchannel_signalempty(devdata->dev->visorchannel,
-				      IOCHAN_FROM_IOPART))
-		napi_schedule(&devdata->napi);
-
-	atomic_set(&devdata->interrupt_rcvd, 0);
-}
-
-/* visornic_probe - probe function for visornic devices
- * @dev: The visor device discovered.
- *
- * Called when visorbus discovers a visornic device on its bus. It creates a new
- * visornic ethernet adapter.
- *
- * Return: 0 on success, or negative integer on error.
- */
-static int visornic_probe(struct visor_device *dev)
-{
-	struct visornic_devdata *devdata = NULL;
-	struct net_device *netdev = NULL;
-	int err;
-	int channel_offset = 0;
-	u8 addr[ETH_ALEN];
-	u64 features;
-
-	netdev = alloc_etherdev(sizeof(struct visornic_devdata));
-	if (!netdev) {
-		dev_err(&dev->device,
-			"%s alloc_etherdev failed\n", __func__);
-		return -ENOMEM;
-	}
-
-	netdev->netdev_ops = &visornic_dev_ops;
-	netdev->watchdog_timeo = 5 * HZ;
-	SET_NETDEV_DEV(netdev, &dev->device);
-
-	/* Get MAC address from channel and read it into the device. */
-	netdev->addr_len = ETH_ALEN;
-	channel_offset = offsetof(struct visor_io_channel, vnic.macaddr);
-	err = visorbus_read_channel(dev, channel_offset, addr, ETH_ALEN);
-	if (err < 0) {
-		dev_err(&dev->device,
-			"%s failed to get mac addr from chan (%d)\n",
-			__func__, err);
-		goto cleanup_netdev;
-	}
-	eth_hw_addr_set(netdev, addr);
-
-	devdata = devdata_initialize(netdev_priv(netdev), dev);
-	if (!devdata) {
-		dev_err(&dev->device,
-			"%s devdata_initialize failed\n", __func__);
-		err = -ENOMEM;
-		goto cleanup_netdev;
-	}
-	/* don't trust messages laying around in the channel */
-	drain_resp_queue(devdata->cmdrsp, devdata);
-
-	devdata->netdev = netdev;
-	dev_set_drvdata(&dev->device, devdata);
-	init_waitqueue_head(&devdata->rsp_queue);
-	spin_lock_init(&devdata->priv_lock);
-	/* not yet */
-	devdata->enabled = 0;
-	atomic_set(&devdata->usage, 1);
-
-	/* Setup rcv bufs */
-	channel_offset = offsetof(struct visor_io_channel, vnic.num_rcv_bufs);
-	err = visorbus_read_channel(dev, channel_offset,
-				    &devdata->num_rcv_bufs, 4);
-	if (err) {
-		dev_err(&dev->device,
-			"%s failed to get #rcv bufs from chan (%d)\n",
-			__func__, err);
-		goto cleanup_netdev;
-	}
-
-	devdata->rcvbuf = kcalloc(devdata->num_rcv_bufs,
-				  sizeof(struct sk_buff *), GFP_KERNEL);
-	if (!devdata->rcvbuf) {
-		err = -ENOMEM;
-		goto cleanup_netdev;
-	}
-
-	/* set the net_xmit outstanding threshold
-	 * always leave two slots open but you should have 3 at a minimum
-	 * note that max_outstanding_net_xmits must be > 0
-	 */
-	devdata->max_outstanding_net_xmits =
-		max_t(unsigned long, 3, ((devdata->num_rcv_bufs / 3) - 2));
-	devdata->upper_threshold_net_xmits =
-		max_t(unsigned long,
-		      2, (devdata->max_outstanding_net_xmits - 1));
-	devdata->lower_threshold_net_xmits =
-		max_t(unsigned long,
-		      1, (devdata->max_outstanding_net_xmits / 2));
-
-	skb_queue_head_init(&devdata->xmitbufhead);
-
-	/* create a cmdrsp we can use to post and unpost rcv buffers */
-	devdata->cmdrsp_rcv = kmalloc(SIZEOF_CMDRSP, GFP_KERNEL);
-	if (!devdata->cmdrsp_rcv) {
-		err = -ENOMEM;
-		goto cleanup_rcvbuf;
-	}
-	devdata->xmit_cmdrsp = kmalloc(SIZEOF_CMDRSP, GFP_KERNEL);
-	if (!devdata->xmit_cmdrsp) {
-		err = -ENOMEM;
-		goto cleanup_cmdrsp_rcv;
-	}
-	INIT_WORK(&devdata->timeout_reset, visornic_timeout_reset);
-	devdata->server_down = false;
-	devdata->server_change_state = false;
-
-	/*set the default mtu */
-	channel_offset = offsetof(struct visor_io_channel, vnic.mtu);
-	err = visorbus_read_channel(dev, channel_offset, &netdev->mtu, 4);
-	if (err) {
-		dev_err(&dev->device,
-			"%s failed to get mtu from chan (%d)\n",
-			__func__, err);
-		goto cleanup_xmit_cmdrsp;
-	}
-
-	/* TODO: Setup Interrupt information */
-	/* Let's start our threads to get responses */
-	netif_napi_add(netdev, &devdata->napi, visornic_poll, NAPI_WEIGHT);
-
-	channel_offset = offsetof(struct visor_io_channel,
-				  channel_header.features);
-	err = visorbus_read_channel(dev, channel_offset, &features, 8);
-	if (err) {
-		dev_err(&dev->device,
-			"%s failed to get features from chan (%d)\n",
-			__func__, err);
-		goto cleanup_napi_add;
-	}
-
-	features |= VISOR_CHANNEL_IS_POLLING;
-	features |= VISOR_DRIVER_ENHANCED_RCVBUF_CHECKING;
-	err = visorbus_write_channel(dev, channel_offset, &features, 8);
-	if (err) {
-		dev_err(&dev->device,
-			"%s failed to set features in chan (%d)\n",
-			__func__, err);
-		goto cleanup_napi_add;
-	}
-
-	/* Note: Interrupts have to be enable before the while
-	 * loop below because the napi routine is responsible for
-	 * setting enab_dis_acked
-	 */
-	visorbus_enable_channel_interrupts(dev);
-
-	err = register_netdev(netdev);
-	if (err) {
-		dev_err(&dev->device,
-			"%s register_netdev failed (%d)\n", __func__, err);
-		goto cleanup_napi_add;
-	}
-
-	dev_info(&dev->device, "%s success netdev=%s\n",
-		 __func__, netdev->name);
-	return 0;
-
-cleanup_napi_add:
-	visorbus_disable_channel_interrupts(dev);
-	netif_napi_del(&devdata->napi);
-
-cleanup_xmit_cmdrsp:
-	kfree(devdata->xmit_cmdrsp);
-
-cleanup_cmdrsp_rcv:
-	kfree(devdata->cmdrsp_rcv);
-
-cleanup_rcvbuf:
-	kfree(devdata->rcvbuf);
-
-cleanup_netdev:
-	free_netdev(netdev);
-	return err;
-}
-
-/* host_side_disappeared - IO Partition is gone
- * @devdata: Device object.
- *
- * IO partition servicing this device is gone; do cleanup.
- */
-static void host_side_disappeared(struct visornic_devdata *devdata)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&devdata->priv_lock, flags);
-	/* indicate device destroyed */
-	devdata->dev = NULL;
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-}
-
-/* visornic_remove - called when visornic dev goes away
- * @dev: Visornic device that is being removed.
- *
- * Called when DEVICE_DESTROY gets called to remove device.
- */
-static void visornic_remove(struct visor_device *dev)
-{
-	struct visornic_devdata *devdata = dev_get_drvdata(&dev->device);
-	struct net_device *netdev;
-	unsigned long flags;
-
-	if (!devdata) {
-		dev_err(&dev->device, "%s no devdata\n", __func__);
-		return;
-	}
-	spin_lock_irqsave(&devdata->priv_lock, flags);
-	if (devdata->going_away) {
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		dev_err(&dev->device, "%s already being removed\n", __func__);
-		return;
-	}
-	devdata->going_away = true;
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-	netdev = devdata->netdev;
-	if (!netdev) {
-		dev_err(&dev->device, "%s not net device\n", __func__);
-		return;
-	}
-
-	/* going_away prevents new items being added to the workqueues */
-	cancel_work_sync(&devdata->timeout_reset);
-
-	/* this will call visornic_close() */
-	unregister_netdev(netdev);
-
-	visorbus_disable_channel_interrupts(devdata->dev);
-	netif_napi_del(&devdata->napi);
-
-	dev_set_drvdata(&dev->device, NULL);
-	host_side_disappeared(devdata);
-	devdata_release(devdata);
-	free_netdev(netdev);
-}
-
-/* visornic_pause - called when IO Part disappears
- * @dev:	   Visornic device that is being serviced.
- * @complete_func: Call when finished.
- *
- * Called when the IO Partition has gone down. Need to free up resources and
- * wait for IO partition to come back. Mark link as down and don't attempt any
- * DMA. When we have freed memory, call the complete_func so that Command knows
- * we are done. If we don't call complete_func, the IO Partition will never
- * come back.
- *
- * Return: 0 on success.
- */
-static int visornic_pause(struct visor_device *dev,
-			  visorbus_state_complete_func complete_func)
-{
-	struct visornic_devdata *devdata = dev_get_drvdata(&dev->device);
-
-	visornic_serverdown(devdata, complete_func);
-	return 0;
-}
-
-/* visornic_resume - called when IO Partition has recovered
- * @dev:	   Visornic device that is being serviced.
- * @compelte_func: Call when finished.
- *
- * Called when the IO partition has recovered. Re-establish connection to the IO
- * Partition and set the link up. Okay to do DMA again.
- *
- * Returns 0 for success, negative integer on error.
- */
-static int visornic_resume(struct visor_device *dev,
-			   visorbus_state_complete_func complete_func)
-{
-	struct visornic_devdata *devdata;
-	struct net_device *netdev;
-	unsigned long flags;
-
-	devdata = dev_get_drvdata(&dev->device);
-	if (!devdata) {
-		dev_err(&dev->device, "%s no devdata\n", __func__);
-		return -EINVAL;
-	}
-
-	netdev = devdata->netdev;
-
-	spin_lock_irqsave(&devdata->priv_lock, flags);
-	if (devdata->server_change_state) {
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		dev_err(&dev->device, "%s server already changing state\n",
-			__func__);
-		return -EINVAL;
-	}
-	if (!devdata->server_down) {
-		spin_unlock_irqrestore(&devdata->priv_lock, flags);
-		dev_err(&dev->device, "%s server not down\n", __func__);
-		complete_func(dev, 0);
-		return 0;
-	}
-	devdata->server_change_state = true;
-	spin_unlock_irqrestore(&devdata->priv_lock, flags);
-
-	/* Must transition channel to ATTACHED state BEFORE
-	 * we can start using the device again.
-	 * TODO: State transitions
-	 */
-	visorbus_enable_channel_interrupts(dev);
-
-	rtnl_lock();
-	dev_open(netdev, NULL);
-	rtnl_unlock();
-
-	complete_func(dev, 0);
-	return 0;
-}
-
-/* This is used to tell the visorbus driver which types of visor devices
- * we support, and what functions to call when a visor device that we support
- * is attached or removed.
- */
-static struct visor_driver visornic_driver = {
-	.name = "visornic",
-	.owner = THIS_MODULE,
-	.channel_types = visornic_channel_types,
-	.probe = visornic_probe,
-	.remove = visornic_remove,
-	.pause = visornic_pause,
-	.resume = visornic_resume,
-	.channel_interrupt = visornic_channel_interrupt,
-};
-
-/* visornic_init - init function
- *
- * Init function for the visornic driver. Do initial driver setup and wait
- * for devices.
- *
- * Return: 0 on success, negative integer on error.
- */
-static int visornic_init(void)
-{
-	int err;
-
-	visornic_debugfs_dir = debugfs_create_dir("visornic", NULL);
-
-	debugfs_create_file("info", 0400, visornic_debugfs_dir, NULL,
-			    &debugfs_info_fops);
-	debugfs_create_file("enable_ints", 0200, visornic_debugfs_dir, NULL,
-			    &debugfs_enable_ints_fops);
-
-	err = visorbus_register_visor_driver(&visornic_driver);
-	if (err)
-		debugfs_remove_recursive(visornic_debugfs_dir);
-
-	return err;
-}
-
-/* visornic_cleanup - driver exit routine
- *
- * Unregister driver from the bus and free up memory.
- */
-static void visornic_cleanup(void)
-{
-	visorbus_unregister_visor_driver(&visornic_driver);
-	debugfs_remove_recursive(visornic_debugfs_dir);
-}
-
-module_init(visornic_init);
-module_exit(visornic_cleanup);
-
-MODULE_AUTHOR("Unisys");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("s-Par NIC driver for virtual network devices");
-- 
2.34.1