From f5859a6112cac9f18283f83022e9ceb2a819123b Mon Sep 17 00:00:00 2001
From: Vladislav Yarmak <vladislav@vm-0.com>
Date: Sat, 30 Nov 2019 23:40:14 +0200
Subject: [PATCH] add patch for Nvidia FBC

---
 patch-fbc.sh | 165 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 165 insertions(+)
 create mode 100755 patch-fbc.sh

diff --git a/patch-fbc.sh b/patch-fbc.sh
new file mode 100755
index 0000000..48d0e1e
--- /dev/null
+++ b/patch-fbc.sh
@@ -0,0 +1,165 @@
+#!/bin/bash
+# halt on any error for safety and proper pipe handling
+set -euo pipefail ; # <- this semicolon and comment make options apply
+# even when script is corrupt by CRLF line terminators (issue #75)
+# empty line must follow this comment for immediate fail with CRLF newlines
+
+backup_path="/opt/nvidia/libnvidia-fbc-backup"
+silent_flag=''
+
+print_usage() { printf '
+SYNOPSIS
+       patch-fbc.sh [-s] [-r|-h|-c VERSION|-l]
+
+DESCRIPTION
+       The patch for Nvidia drivers to allow FBC on consumer devices
+
+       -s             Silent mode (No output)
+       -r             Rollback to original (Restore lib from backup)
+       -h             Print this help message
+       -c VERSION     Check if version VERSION supported by this patch.
+                      Returns true exit code (0) if version is supported.
+       -l             List supported driver versions
+
+'
+}
+
+# shellcheck disable=SC2209
+opmode="patch"
+
+while getopts 'rshc:l' flag; do
+    case "${flag}" in
+        r) opmode="${opmode}rollback" ;;
+        s) silent_flag='true' ;;
+        h) opmode="${opmode}help" ;;
+        c) opmode="${opmode}checkversion" ; checked_version="$OPTARG" ;;
+        l) opmode="${opmode}listversions" ;;
+        *) echo "Incorrect option specified in command line" ; exit 2 ;;
+    esac
+done
+
+if [[ $silent_flag ]]; then
+    exec 1> /dev/null
+fi
+
+declare -A patch_list=(
+    ["440.36"]='s/\x85\xc0\x89\xc3\x0f\x85\xa9\xfa\xff\xff/\x31\xc0\x89\xc3\x0f\x85\xa9\xfa\xff\xff/'
+)
+
+declare -A object_list=(
+    ["440.36"]='libnvidia-fbc.so'
+)
+
+check_version_supported () {
+    local ver="$1"
+    [[ "${patch_list[$ver]+isset}" && "${object_list[$ver]+isset}" ]]
+}
+
+get_supported_versions () {
+    for drv in "${!patch_list[@]}"; do
+        [[ "${object_list[$drv]+isset}" ]] && echo "$drv"
+    done | sort -t. -n
+    return 0
+}
+
+patch_common () {
+    NVIDIA_SMI="$(command -v nvidia-smi || true)"
+    if [[ ! "$NVIDIA_SMI" ]] ; then
+        echo 'nvidia-smi utility not found. Probably driver is not installed.'
+        exit 1
+    fi
+
+    if ! driver_version=$("$NVIDIA_SMI" --query-gpu=driver_version --format=csv,noheader,nounits | head -n 1) ; then
+        echo 'Something went wrong. Check nvidia driver'
+        exit 1
+    fi
+
+    echo "Detected nvidia driver version: $driver_version"
+
+    if ! check_version_supported "$driver_version" ; then
+        echo "Patch for this ($driver_version) nvidia driver not found."
+        echo "Patch is available for versions: "
+        get_supported_versions
+        exit 1
+    fi
+
+    patch="${patch_list[$driver_version]}"
+    object="${object_list[$driver_version]}"
+
+    declare -a driver_locations=(
+        '/usr/lib/x86_64-linux-gnu'
+        '/usr/lib/x86_64-linux-gnu/nvidia/current/'
+        '/usr/lib64'
+        "/usr/lib/nvidia-${driver_version%%.*}"
+    )
+
+    dir_found=''
+    for driver_dir in "${driver_locations[@]}" ; do
+        if [[ -e "$driver_dir/$object.$driver_version" ]]; then
+            dir_found='true'
+            break
+        fi
+    done
+
+    [[ "$dir_found" ]] || { echo "ERROR: cannot detect driver directory"; exit 1; }
+
+}
+
+rollback () {
+    patch_common
+    if [[ -f "$backup_path/$object.$driver_version" ]]; then
+        cp -p "$backup_path/$object.$driver_version" \
+           "$driver_dir/$object.$driver_version"
+        echo "Restore from backup $object.$driver_version"
+    else
+        echo "Backup not found. Try to patch first."
+        exit 1
+    fi
+}
+
+patch () {
+    patch_common
+    if [[ -f "$backup_path/$object.$driver_version" ]]; then
+        bkp_hash="$(sha1sum "$backup_path/$object.$driver_version" | cut -f1 -d\ )"
+        drv_hash="$(sha1sum "$driver_dir/$object.$driver_version" | cut -f1 -d\ )"
+        if [[ "$bkp_hash" != "$drv_hash" ]] ; then
+            echo "Backup exists and driver file differ from backup. Skipping patch."
+            return 0
+        fi
+    else
+        echo "Attention! Backup not found. Copying current $object to backup."
+        mkdir -p "$backup_path"
+        cp -p "$driver_dir/$object.$driver_version" \
+           "$backup_path/$object.$driver_version"
+    fi
+    sha1sum "$backup_path/$object.$driver_version"
+    sed "$patch" "$backup_path/$object.$driver_version" > \
+      "${PATCH_OUTPUT_DIR-$driver_dir}/$object.$driver_version"
+    sha1sum "${PATCH_OUTPUT_DIR-$driver_dir}/$object.$driver_version"
+    ldconfig
+    echo "Patched!"
+}
+
+query_version_support () {
+    if check_version_supported "$checked_version" ; then
+        echo "SUPPORTED"
+        exit 0
+    else
+        echo "NOT SUPPORTED"
+        exit 1
+    fi
+}
+
+list_supported_versions () {
+    get_supported_versions
+}
+
+case "${opmode}" in
+    patch) patch ;;
+    patchrollback) rollback ;;
+    patchhelp) print_usage ; exit 2 ;;
+    patchcheckversion) query_version_support ;;
+    patchlistversions) list_supported_versions ;;
+    *) echo "Incorrect combination of flags. Use option -h to get help."
+       exit 2 ;;
+esac