Revamp ROCm support

This refines where we extract the LLM libraries to by adding a new
OLLAMA_HOME env var, that defaults to `~/.ollama` The logic was already
idempotenent, so this should speed up startups after the first time a
new release is deployed.  It also cleans up after itself.

We now build only a single ROCm version (latest major) on both windows
and linux.  Given the large size of ROCms tensor files, we split the
dependency out.  It's bundled into the installer on windows, and a
separate download on windows.  The linux install script is now smart and
detects the presence of AMD GPUs and looks to see if rocm v6 is already
present, and if not, then downloads our dependency tar file.

For Linux discovery, we now use sysfs and check each GPU against what
ROCm supports so we can degrade to CPU gracefully instead of having
llama.cpp+rocm assert/crash on us.  For Windows, we now use go's windows
dynamic library loading logic to access the amdhip64.dll APIs to query
the GPU information.

llm/generate/gen_windows.ps1

@@ -2,19 +2,52 @@
 
 $ErrorActionPreference = "Stop"
 
+function amdGPUs {
+    if ($env:AMDGPU_TARGETS) {
+        return $env:AMDGPU_TARGETS
+    }
+    # TODO - load from some common data file for linux + windows build consistency
+    $GPU_LIST = @(
+        "gfx900"
+        "gfx906:xnack-"
+        "gfx908:xnack-"
+        "gfx90a:xnack+"
+        "gfx90a:xnack-"
+        "gfx1010"
+        "gfx1012"
+        "gfx1030"
+        "gfx1100"
+        "gfx1101"
+        "gfx1102"
+    )
+    $GPU_LIST -join ';'
+}
+
 function init_vars {
+    # Verify the environment is a Developer Shell for MSVC 2019
+    write-host $env:VSINSTALLDIR
+    if (($env:VSINSTALLDIR -eq $null)) {
+        Write-Error "`r`nBUILD ERROR - YOUR DEVELOPMENT ENVIRONMENT IS NOT SET UP CORRECTLY`r`nTo build Ollama you must run from an MSVC Developer Shell`r`nSee .\docs\development.md for instructions to set up your dev environment"
+        exit 1
+    }
     $script:SRC_DIR = $(resolve-path "..\..\")
     $script:llamacppDir = "../llama.cpp"
-    $script:cmakeDefs = @("-DBUILD_SHARED_LIBS=on", "-DLLAMA_NATIVE=off",  "-A", "x64")
+    $script:cmakeDefs = @(
+        "-DBUILD_SHARED_LIBS=on",
+        "-DLLAMA_NATIVE=off"
+        )
     $script:cmakeTargets = @("ext_server")
     $script:ARCH = "amd64" # arm not yet supported.
     if ($env:CGO_CFLAGS -contains "-g") {
-        $script:cmakeDefs += @("-DCMAKE_VERBOSE_MAKEFILE=on", "-DLLAMA_SERVER_VERBOSE=on")
+        $script:cmakeDefs += @("-DCMAKE_VERBOSE_MAKEFILE=on", "-DLLAMA_SERVER_VERBOSE=on", "-DCMAKE_BUILD_TYPE=RelWithDebInfo")
         $script:config = "RelWithDebInfo"
     } else {
-        $script:cmakeDefs += @("-DLLAMA_SERVER_VERBOSE=off")
+        $script:cmakeDefs += @("-DLLAMA_SERVER_VERBOSE=off", "-DCMAKE_BUILD_TYPE=Release")
         $script:config = "Release"
     }
+    if ($null -ne $env:CMAKE_SYSTEM_VERSION) {
+        $script:cmakeDefs += @("-DCMAKE_SYSTEM_VERSION=${env:CMAKE_SYSTEM_VERSION}")
+    }
     # Try to find the CUDA dir
     if ($env:CUDA_LIB_DIR -eq $null) {
         $d=(get-command -ea 'silentlycontinue' nvcc).path
@@ -157,7 +190,7 @@ apply_patches
 $script:commonCpuDefs = @("-DCMAKE_POSITION_INDEPENDENT_CODE=on")
 
 init_vars
-$script:cmakeDefs = $script:commonCpuDefs + @("-DLLAMA_AVX=off", "-DLLAMA_AVX2=off", "-DLLAMA_AVX512=off", "-DLLAMA_FMA=off", "-DLLAMA_F16C=off") + $script:cmakeDefs
+$script:cmakeDefs = $script:commonCpuDefs + @("-A", "x64", "-DLLAMA_AVX=off", "-DLLAMA_AVX2=off", "-DLLAMA_AVX512=off", "-DLLAMA_FMA=off", "-DLLAMA_F16C=off") + $script:cmakeDefs
 $script:buildDir="${script:llamacppDir}/build/windows/${script:ARCH}/cpu"
 write-host "Building LCD CPU"
 build
@@ -166,7 +199,7 @@ sign
 compress_libs
 
 init_vars
-$script:cmakeDefs = $script:commonCpuDefs + @("-DLLAMA_AVX=on", "-DLLAMA_AVX2=off", "-DLLAMA_AVX512=off", "-DLLAMA_FMA=off", "-DLLAMA_F16C=off") + $script:cmakeDefs
+$script:cmakeDefs = $script:commonCpuDefs + @("-A", "x64", "-DLLAMA_AVX=on", "-DLLAMA_AVX2=off", "-DLLAMA_AVX512=off", "-DLLAMA_FMA=off", "-DLLAMA_F16C=off") + $script:cmakeDefs
 $script:buildDir="${script:llamacppDir}/build/windows/${script:ARCH}/cpu_avx"
 write-host "Building AVX CPU"
 build
@@ -175,7 +208,7 @@ sign
 compress_libs
 
 init_vars
-$script:cmakeDefs = $script:commonCpuDefs + @("-DLLAMA_AVX=on", "-DLLAMA_AVX2=on", "-DLLAMA_AVX512=off", "-DLLAMA_FMA=on", "-DLLAMA_F16C=on") + $script:cmakeDefs
+$script:cmakeDefs = $script:commonCpuDefs + @("-A", "x64", "-DLLAMA_AVX=on", "-DLLAMA_AVX2=on", "-DLLAMA_AVX512=off", "-DLLAMA_FMA=on", "-DLLAMA_F16C=on") + $script:cmakeDefs
 $script:buildDir="${script:llamacppDir}/build/windows/${script:ARCH}/cpu_avx2"
 write-host "Building AVX2 CPU"
 build
@@ -192,18 +225,51 @@ if ($null -ne $script:CUDA_LIB_DIR) {
     }
     init_vars
     $script:buildDir="${script:llamacppDir}/build/windows/${script:ARCH}/cuda$script:CUDA_VARIANT"
-    $script:cmakeDefs += @("-DLLAMA_CUBLAS=ON", "-DLLAMA_AVX=on", "-DLLAMA_AVX2=off", "-DCUDAToolkit_INCLUDE_DIR=$script:CUDA_INCLUDE_DIR", "-DCMAKE_CUDA_ARCHITECTURES=${script:CMAKE_CUDA_ARCHITECTURES}")
+    $script:cmakeDefs += @("-A", "x64", "-DLLAMA_CUBLAS=ON", "-DLLAMA_AVX=on", "-DLLAMA_AVX2=off", "-DCUDAToolkit_INCLUDE_DIR=$script:CUDA_INCLUDE_DIR", "-DCMAKE_CUDA_ARCHITECTURES=${script:CMAKE_CUDA_ARCHITECTURES}")
+    write-host "Building CUDA"
     build
     install
     sign
     compress_libs
 }
-# TODO - actually implement ROCm support on windows
-$script:buildDir="${script:llamacppDir}/build/windows/${script:ARCH}/rocm"
 
-rm -ea 0 -recurse -force -path "${script:buildDir}/lib"
-md "${script:buildDir}/lib" -ea 0 > $null
-echo $null >> "${script:buildDir}/lib/.generated"
+if ($null -ne $env:HIP_PATH) {
+    $script:ROCM_VERSION=(get-item $env:HIP_PATH).Basename
+    if ($null -ne $script:ROCM_VERSION) {
+        $script:ROCM_VARIANT="_v"+$script:ROCM_VERSION
+    }
+
+    init_vars
+    $script:buildDir="${script:llamacppDir}/build/windows/${script:ARCH}/rocm$script:ROCM_VARIANT"
+    $script:cmakeDefs += @(
+        "-G", "Ninja", 
+        "-DCMAKE_C_COMPILER=clang.exe",
+        "-DCMAKE_CXX_COMPILER=clang++.exe",
+        "-DLLAMA_HIPBLAS=on",
+        "-DLLAMA_AVX=on",
+        "-DLLAMA_AVX2=off",
+        "-DCMAKE_POSITION_INDEPENDENT_CODE=on",
+        "-DAMDGPU_TARGETS=$(amdGPUs)",
+        "-DGPU_TARGETS=$(amdGPUs)"
+        )
+
+    # Make sure the ROCm binary dir is first in the path
+    $env:PATH="$env:HIP_PATH\bin;$env:VSINSTALLDIR\Common7\IDE\CommonExtensions\Microsoft\CMake\Ninja;$env:PATH"
+
+    # We have to clobber the LIB var from the developer shell for clang to work properly
+    $env:LIB=""
+
+    write-host "Building ROCm"
+    build
+    # Ninja doesn't prefix with config name
+    ${script:config}=""
+    install
+    if ($null -ne $script:DUMPBIN) {
+        & "$script:DUMPBIN" /dependents "${script:buildDir}/bin/${script:config}/ext_server.dll" | select-string ".dll"
+    }
+    sign
+    compress_libs
+}
 
 cleanup
 write-host "`ngo generate completed"