drivers/virt: introduce Freescale hypervisor management driver

Add the drivers/virt directory, which houses drivers that support
virtualization environments, and add the Freescale hypervisor management
driver.

The Freescale hypervisor management driver provides several services to
drivers and applications related to the Freescale hypervisor:

1. An ioctl interface for querying and managing partitions

2. A file interface to reading incoming doorbells

3. An interrupt handler for shutting down the partition upon receiving the
   shutdown doorbell from a manager partition

4. A kernel interface for receiving callbacks when a managed partition
   shuts down.

Signed-off-by: Timur Tabi <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Kumar Gala <[email protected]>

Author: Timur Tabi

Documentation/ioctl/ioctl-number.txt

@@ -301,6 +301,7 @@ Code  Seq#(hex)	Include File		Comments
 					<mailto:[email protected]>
 0xAE	all	linux/kvm.h		Kernel-based Virtual Machine
 					<mailto:[email protected]>
+0xAF	00-1F	linux/fsl_hypervisor.h	Freescale hypervisor
 0xB0	all	RATIO devices		in development:
 					<mailto:[email protected]>
 0xB1	00-1F	PPPoX			<mailto:[email protected]>

drivers/Kconfig

@@ -126,4 +126,6 @@ source "drivers/hwspinlock/Kconfig"
 
 source "drivers/clocksource/Kconfig"
 
+source "drivers/virt/Kconfig"
+
 endmenu

drivers/Makefile

@@ -122,3 +122,6 @@ obj-y				+= ieee802154/
 obj-y				+= clk/
 
 obj-$(CONFIG_HWSPINLOCK)	+= hwspinlock/
+
+# Virtualization drivers
+obj-$(CONFIG_VIRT_DRIVERS)	+= virt/

drivers/virt/Kconfig

@@ -0,0 +1,32 @@
+#
+# Virtualization support drivers
+#
+
+menuconfig VIRT_DRIVERS
+	bool "Virtualization drivers"
+	---help---
+	  Say Y here to get to see options for device drivers that support
+	  virtualization environments.
+
+	  If you say N, all options in this submenu will be skipped and disabled.
+
+if VIRT_DRIVERS
+
+config FSL_HV_MANAGER
+	tristate "Freescale hypervisor management driver"
+	depends on FSL_SOC
+	help
+          The Freescale hypervisor management driver provides several services
+	  to drivers and applications related to the Freescale hypervisor:
+
+          1) An ioctl interface for querying and managing partitions.
+
+          2) A file interface to reading incoming doorbells.
+
+          3) An interrupt handler for shutting down the partition upon
+	     receiving the shutdown doorbell from a manager partition.
+
+          4) A kernel interface for receiving callbacks when a managed
+	     partition shuts down.
+
+endif

drivers/virt/Makefile

@@ -0,0 +1,5 @@
+#
+# Makefile for drivers that support virtualization
+#
+
+obj-$(CONFIG_FSL_HV_MANAGER)	+= fsl_hypervisor.o