document CUDA only install

Document installing from sources for use with NVIDIA CUDA.
Adds instructions to INSTALL.md and a link to the README.md.

Author: burlen

INSTALL.md

@@ -1,9 +1,13 @@
-## Prerequisites
+## Installation for use with AMD GPUs
+This section describes installing for use with AMD GPUs. For use with NVIDIA
+GPUs see [here](INSTALL.md#installation-for-use-with-nvidia-gpus).
+
+### Prerequisites
 
 -   Install mesa-common-dev
 -   Either build or install [COMGR](https://github.com/RadeonOpenCompute/ROCm-CompilerSupport), [CLANG](https://github.com/RadeonOpenCompute/llvm-project) and [Device Library](https://github.com/RadeonOpenCompute/ROCm-Device-Libs)
 
-## Getting the source code
+### Getting the source code
 
 ```bash
 git clone -b develop https://github.com/ROCm-Developer-Tools/hipamd.git
@@ -12,7 +16,7 @@ git clone -b develop https://github.com/ROCm-Developer-Tools/ROCclr.git
 git clone -b develop https://github.com/RadeonOpenCompute/ROCm-OpenCL-Runtime.git
 ```
 
-## Set the environment variables
+### Set the environment variables
 
 ```bash
 export HIPAMD_DIR="$(readlink -f hipamd)"
@@ -21,7 +25,7 @@ export ROCclr_DIR="$(readlink -f ROCclr)"
 export OPENCL_DIR="$(readlink -f ROCm-OpenCL-Runtime)"
 ```
 
-## Build HIPAMD
+### Build HIPAMD
 Commands to build hipamd are as following,
 
 ```bash
@@ -36,3 +40,79 @@ Note,
 HIP_COMMON_DIR looks for hip common ([HIP](https://github.com/ROCm-Developer-Tools/HIP/)) source codes.
 By default, release version of hipamd is built.
 
+
+
+
+## Installation for use with NVIDIA GPUs
+
+This section describes installing for use with NVIDIA GPUs. For use with NVIDIA GPUs see [here](INSTALL.md#installation-for-use-with-amd-gpus).
+
+### Prerequisites
+
+- The NVIDIA CUDA toolkit with the `nvcc` compiler should be installed and in
+  the `PATH` and `LD_LIBRARY_PATH`
+
+### Installation
+
+One needs both the `hip` and `hipamd` source code repositories. These need to
+be made known to `hipamd` during the CMake configure phase. The key CMake variables
+are `HIP_PLATFORM=nvidia` and `HIP_COMMON=<path to the clone of hip repo>`.
+
+The following shell script illustrates a minimal CUDA backed HIP install from
+sources.  The script will clone the sources, configure, and install HIP for use
+with CUDA in the current directory.  You may want to modify `BUILD_DIR`,
+`INSTALL_DIR`, and `BRANCH` to suit your needs.  NOTE: This script will only
+set you up to use HIP with CUDA.
+
+```bash
+#!/bin/bash
+
+set -exuo pipefail
+
+# the directory where to compile and install
+BUILD_DIR=`pwd`/hip_nvidia/build
+INSTALL_DIR=`pwd`/hip_nvidia/install
+
+# the branch to use. the two HIP source repos should be checked out to the
+# same branch.
+BRANCH=rocm-4.5.x
+
+# make the directories for the sources, build, and install
+mkdir -p ${BUILD_DIR}
+mkdir -p ${INSTALL_DIR}
+
+# download the hip sources
+cd ${BUILD_DIR}
+
+git clone -b "${BRANCH}" --single-branch \
+    https://github.com/ROCm-Developer-Tools/hip.git
+
+git clone -b "${BRANCH}" --single-branch \
+    https://github.com/ROCm-Developer-Tools/hipamd.git
+
+# create the build directory
+mkdir -p ${BUILD_DIR}/build_${BRANCH}
+cd ${BUILD_DIR}/build_${BRANCH}
+
+# configure, make, make install
+cmake \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}" \
+    -DHIP_COMMON_DIR="${BUILD_DIR}/hip" \
+    -DHIP_PLATFORM=nvidia \
+    ../hipamd
+
+make -j install
+
+```
+
+### Post install and use
+
+In order for tools such as `hipify-perl` and `hipcc` to work, the following
+environment variables should be propagated to the runtime environment.
+
+```
+export HIP_PATH=${INSTALL_DIR}
+export PATH=${HIP_PATH}/bin/:$PATH
+export HIP_PLATFORM=nvidia
+```

README.md

@@ -1,6 +1,11 @@
-## What is this repository for? ###
+## What is this repository for?
+
+This repository provides [HIP](https://github.com/ROCm-Developer-Tools/HIP) implementation specifically for AMD and NVIDIA platforms.
+
+## Install
+
+See [INSTALL.md](INSTALL.md)
 
-This repository provides [HIP](https://github.com/ROCm-Developer-Tools/HIP) implementation specifically for AMD platform.
 
 ## DISCLAIMER
 
@@ -21,4 +26,4 @@ The hipamd repository maintains several branches. The branches that are of impor
 hipamd releases are typically naming convention for each ROCM release to help differentiate them.
 
 * rocm x.yy: These are the stable releases based on the ROCM release.
-  This type of release is typically made once a month.*
+  This type of release is typically made once a month.*