Merge feature/dxgkrnl/5.15 into v5.15.137

* commit '26d29d8377a78f1b0014f6c9ba6df9ed5763f885': (47 commits)
  drivers: hv: dxgkrnl: Retry sending a VM bus packet when there is no place in the ring buffer
  drivers: hv: dxgkrnl: Fixed the implementation of D3DKMTQueryClockCalibration
  drivers: hv: dxgkrnl: Fixed coding style issues
  drivers: hv: dxgkrnl: Implement known escapes
  drivers: hv: dxgkrnl: Implement D3DDKMTIsFeatureEnabled API
  drivers: hv: dxgkrnl: Implement the D3DKMTEnumProcesses API
  drivers: hv: dxgkrnl: Handle process ID in D3DKMTQueryStatistics
  drivers: hv: dxgkrnl: Added implementation for D3DKMTInvalidateCache
  drivers: hv: dxgkrnl: Added support for compute only adapters
  drivers: hv: dxgkrnl: Added missed NULL check for resource object
  drivers: hv: dxgkrnl: Close shared file objects in case of a failure
  drivers: hv: dxgkrnl: Fix synchronization locks
  drivers: hv: dxgkrnl: Improve tracing and return values from copy from user
  drivers: hv: dxgkrnl: Implement D3DKMTWaitSyncFile
  drivers: hv: dxgkrnl: Use tracing instead of dev_dbg
  drivers: hv: dxgkrnl: Creation of dxgsyncfile objects
  drivers: hv: dxgkrnl: Remove dxgk_init_ioctls
  drivers: hv: dxgkrnl: Removed struct vmbus_gpadl, which was defined in the main linux branch
  drivers: hv: dxgkrnl: Add support to map guest pages by host
  drivers: hv: dxgkrnl: Manage compute device virtual addresses
  ...

Author: kelsey-steele

MAINTAINERS

@@ -8727,6 +8727,13 @@ 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 <iourit@microsoft.com>
+L:	linux-hyperv@vger.kernel.org
+S:	Supported
+F:	drivers/hv/dxgkrnl/
+F:	include/uapi/misc/d3dkmthk.h
+
 HYPERVISOR VIRTUAL CONSOLE DRIVER
 L:	linuxppc-dev@lists.ozlabs.org
 S:	Odd Fixes

drivers/hv/Kconfig

@@ -29,4 +29,6 @@ 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 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0
+# Configuration for the hyper-v virtual compute driver (dxgkrnl)
+#
+
+config DXGKRNL
+	tristate "Microsoft Paravirtualized GPU support"
+	depends on HYPERV
+	depends on 64BIT || COMPILE_TEST
+	select DMA_SHARED_BUFFER
+	select SYNC_FILE
+	help
+	  This driver supports paravirtualized virtual compute 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 compute 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.

drivers/hv/dxgkrnl/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+# Makefile for the hyper-v compute device driver (dxgkrnl).
+
+obj-$(CONFIG_DXGKRNL)	+= dxgkrnl.o
+dxgkrnl-y := dxgmodule.o hmgr.o misc.o dxgadapter.o ioctl.o dxgvmbus.o dxgprocess.o  dxgsyncfile.o