gpu: nvgpu: Userspace POSIX support

Add support for compiling nvgpu in a POSIX compliant userspace.
This code adds all of the necessary abstraction interfaces (mostly
stubbed) to enabled extremely limited and basic functionality in
nvgpu.

The goal of this code is to facilitate unit testing of the nvgpu
common core. By doing this in userspace it is much easier to write
tests that rely on very particular states within nvgpu since a user
can very precisely control the state of nvgpu.

JIRA NVGPU-525

Change-Id: I30e95016df14997d951075777e0585f912dc5960
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1683914
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 73 insertions, 0 deletions

diff --git a/userspace/Makefile b/userspace/Makefile
new file mode 100644
index 00000000..70e93bad
--- /dev/null
+++ b/userspace/Makefile
@@ -0,0 +1,73 @@
+# Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+# DEALINGS IN THE SOFTWARE.
+
+# Turn off suffix rules. They are deprecated.
+.SUFFIXES:
+
+# Full paths. Makes submakefiles easier. That said this make file _must_ be run
+# from <NVGPU>/userspace/.
+TWD=$(CURDIR)
+
+# Top level out dir.
+OUT=$(TWD)/build
+
+# Nvgpu driver code.
+NVGPU_SRC=$(TWD)/../drivers/gpu/nvgpu
+NVGPU_OUT=$(OUT)/libnvgpu
+
+INCLUDES=                       \
+        -I$(NVGPU_SRC)          \
+        -I$(NVGPU_SRC)/include  \
+        -I../include            \
+        -I../include/uapi
+
+CONFIGS=                        \
+        -D__NVGPU_POSIX__
+
+# Compiler, c-flags, etc.
+
+# CC    = clang
+CC      = gcc
+CFLAGS  = -Wall -ggdb  -Werror -fPIC $(INCLUDES) $(CONFIGS)
+LIBS    = -lpthread -pthread
+
+# Source files. We expect $(OBJS) and $(HEADERS) to get filled in here.
+include Makefile.sources
+
+# Linuxy configs. We want these so that we can mirror builds from the actual
+# Linux kernel.
+include Makefile.configs
+
+all: $(OUT)/libnvgpu-drv.so
+
+$(OUT)/libnvgpu-drv.so: $(OBJS)
+        $(CC) -shared -o $(OUT)/libnvgpu-drv.so $(OBJS) -lgcov
+
+# Default build target for all the object files we want to build in userspace.
+$(NVGPU_OUT)/%.o : $(NVGPU_SRC)/%.c $(HEADERS)
+        @if [ ! -d $(dir $@) ] ; then \
+                mkdir -p $(dir $@) ; \
+        fi
+        $(CC) $(CFLAGS) $(configs) -c -o $@ $<
+
+.PHONY: clean
+
+clean:
+        rm -rf $(OUT)