misc: vpusmm: add alloc/import DMABuf for VPU

 functions are:
 1.alloc/export DMABuf accessible to VPU
 2.import external DMABuf for VPU to access
 3.translate virtual address with mem-mapped and imported DMABuf
   into VPU address

Signed-off-by: tingqian <tingqian.li@intel.com>

drivers/misc/Kconfig

@@ -482,4 +482,5 @@ source "drivers/misc/ocxl/Kconfig"
 source "drivers/misc/cardreader/Kconfig"
 source "drivers/misc/habanalabs/Kconfig"
 source "drivers/misc/gna/Kconfig"
+source "drivers/misc/vpusmm/Kconfig"
 endmenu

drivers/misc/Makefile

@@ -58,3 +58,4 @@ obj-$(CONFIG_PVPANIC)   	+= pvpanic.o
 obj-$(CONFIG_HABANA_AI)		+= habanalabs/
 obj-$(CONFIG_XILINX_SDFEC)	+= xilinx_sdfec.o
 obj-$(CONFIG_INTEL_GNA)        += gna/
+obj-$(CONFIG_VPUSMM)		+= vpusmm/

drivers/misc/vpusmm/Kconfig

@@ -0,0 +1,14 @@
+# Copyright (C) 2019 Intel Corporation
+# SPDX-License-Identifier: GPL-2.0-only
+
+config VPUSMM
+	tristate "Support for VPU Shared memory management"
+	help
+	  VPUSMM exposes following capabilities to user space application
+	  through ioctl syscall:
+	    1. allocate DMABuf qualified to be accessed by KeemBay VPU Sub-System.
+	    2. import/unimport qualified DMABuf for VPU to access.
+	    3. translate user-space virtual address within a mem-mapped
+	       region of an imported DMABuf into VPU side DMA address,
+	       which allows application to pass buffer pointer with
+	       offsets to VPU sub-system.

drivers/misc/vpusmm/Makefile

@@ -0,0 +1,6 @@
+# Copyright (C) 2019 Intel Corporation
+# SPDX-License-Identifier: GPL-2.0-only
+#     Makefile for KeemBay VPUSMM
+#
+obj-$(CONFIG_VPUSMM) += vpusmm_driver.o
+