Merge feature/dxgkrnl (ec49cf3)

* msft/feature/dxgkrnl:
  drivers: hv: dxgkrnl: create a MAINTAINERS entry
  drivers: hv: dxgkrnl: hook up dxgkrnl
  drivers: hv: dxgkrnl: core code

Author: tyhicks

MAINTAINERS

@@ -8190,6 +8190,12 @@ F:	Documentation/devicetree/bindings/mtd/ti,am654-hbmc.txt
 F:	drivers/mtd/hyperbus/
 F:	include/linux/mtd/hyperbus.h
 
+Hyper-V vGPU DRIVER
+M:	Iouri Tarassov <[email protected]>
+L:	[email protected]
+S:	Supported
+F:	drivers/hv/dxgkrnl/
+
 HYPERVISOR VIRTUAL CONSOLE DRIVER
 L:	[email protected]
 S:	Odd Fixes

drivers/hv/Kconfig

@@ -26,4 +26,6 @@ config HYPERV_BALLOON
 	help
 	  Select this option to enable Hyper-V Balloon driver.
 
+source "drivers/hv/dxgkrnl/Kconfig"
+
 endmenu

drivers/hv/Makefile

@@ -2,6 +2,7 @@
 obj-$(CONFIG_HYPERV)		+= hv_vmbus.o
 obj-$(CONFIG_HYPERV_UTILS)	+= hv_utils.o
 obj-$(CONFIG_HYPERV_BALLOON)	+= hv_balloon.o
+obj-$(CONFIG_DXGKRNL)		+= dxgkrnl/
 
 CFLAGS_hv_trace.o = -I$(src)
 CFLAGS_hv_balloon.o = -I$(src)

drivers/hv/dxgkrnl/Kconfig

@@ -0,0 +1,32 @@
+#
+# dxgkrnl configuration
+#
+
+config DXGKRNL
+	tristate "Microsoft Paravirtualized GPU support"
+	depends on HYPERV
+	help
+	  This driver supports paravirtualized virtual GPU devices, exposed by
+	  Microsoft Hyper-V when Linux is running inside of a virtual machine
+	  hosted by Windows. The virtual machines needs to be configured to use
+	  host GPU adapters. The driver name is dxgkrnl.
+
+	  An example of such virtual machine is a  Windows Subsystem for
+	  Linux container. When such container is instantiated, the Windows host
+	  assigns compatible host GPU adapters to the container. The corresponding
+	  virtual GPU devices appear on the PCI bus in the container. These
+	  devices are enumerated and accessed by this driver.
+
+	  Communications with the driver are done by using the Microsoft libdxcore
+	  library, which translates the D3DKMT interface
+	  <https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/d3dkmthk/>
+	  to the driver IOCTLs. The virtual GPU devices are paravirtualized,
+	  which means that access to the hardware is done in the host. The driver
+	  communicates with the host using Hyper-V VM bus communication channels.
+
+config DXGKRNL_DEBUG
+	bool "Enable debug checks for Microsoft Paravirtualized GPU driver"
+	depends on DXGKRNL
+	help
+	  Say Y here if you want the Microsoft Paravirtualized GPU driver to
+	  perform additional checks and provide more debug information.

drivers/hv/dxgkrnl/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+# Makefile for the Linux video drivers.
+
+obj-$(CONFIG_DXGKRNL)	+= dxgkrnl.o
+dxgkrnl-y		:= dxgmodule.o hmgr.o misc.o dxgadapter.o ioctl.o dxgvmbus.o dxgprocess.o