From 22203ca48d541a75a37d40d2a5cbea067baf3823 Mon Sep 17 00:00:00 2001
From: Hell <helldweller@protonmail.com>
Date: Wed, 20 Jun 2018 17:29:59 +0700
Subject: [PATCH] some refactoring patch, added multi-version support, added
 patch for 396.24 driver

---
 README.md | 50 ++++++++++++++++++++-------------
 patch.sh  | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 108 insertions(+), 26 deletions(-)
 mode change 100644 => 100755 patch.sh

diff --git a/README.md b/README.md
index dbc2efb..4bbe2fb 100644
--- a/README.md
+++ b/README.md
@@ -1,40 +1,50 @@
 # nvidia-patch
 
-requirements:
-- ubuntu 14.04
-- nvenc-compatible gpu
-- nvidia 375.39 driver
+Requirements:
+- ubuntu (< 16.04 for 375.39 nvidia driver or kernel < 4.15)
+- nvenc-compatible gpu (https://developer.nvidia.com/video-encode-decode-gpu-support-matrix#Encoder)
+- nvidia driver (patch availible for 375.39 or 396.24)
 
-# step-by-step :
+Tested on Ubuntu 18.04 LTS (GNU/Linux 4.15.0-23-generic x86_64)
 
-Download driver: https://yadi.sk/d/yahf1Y-D3PJnzd
+## step-by-step :
+
+### Download driver
+http://us.download.nvidia.com/XFree86/Linux-x86_64/375.39/NVIDIA-Linux-x86_64-375.39.run
+http://us.download.nvidia.com/XFree86/Linux-x86_64/396.24/NVIDIA-Linux-x86_64-396.24.run
+
+### Install driver 396.24
 ```bash
+mkdir /opt/nvidia && cd /opt/nvidia
+wget http://us.download.nvidia.com/XFree86/Linux-x86_64/396.24/NVIDIA-Linux-x86_64-396.24.run
 chmod +x ./NVIDIA-Linux-x86_64-375.39.run
-
-./NVIDIA-Linux-x86_64-375.39.run
+./NVIDIA-Linux-x86_64-396.24.run
 ```
 
-check driver:
+### Check driver
 ```bash
 nvidia-smi
+```
 
-mkdir ~/nvenc_backup
-
-cd ~/nvenc_backup
-
-cp /usr/lib/x86_64-linux-gnu/libnvidia-encode.so.375.39 ~/nvenc_backup/
-
-wget https://raw.githubusercontent.com/keylase/nvidia-patch/master/patch.sh
-
-chmod +x patch.sh
+### Patch libnvidia-encode.so (with backup)
+```bash
+bash ./patch.sh
+```
 
-./patch.sh ~/nvenc_backup/libnvidia-encode.so.375.39 /usr/lib/x86_64-linux-gnu/libnvidia-encode.so.375.39
+### Silent patch libnvidia-encode.so
+```bash
+bash ./patch.sh -s
+```
 
-reboot
+### Rollback libnvidia-encode.so (restore from backup)
+```bash
+bash ./patch.sh -r
 ```
 
 ## See also
 
+https://habr.com/post/262563/
+
 If you experience `CreateBitstreamBuffer failed: out of memory (10)`, then you have to lower buffers number used for every encoding session. If you are using `ffmpeg`, consider using this [patch](https://gist.github.com/Snawoot/70ae403716c698cb86ab015626d72bd4).
 
 
diff --git a/patch.sh b/patch.sh
old mode 100644
new mode 100755
index 0644e89..474f2b9
--- a/patch.sh
+++ b/patch.sh
@@ -1,9 +1,81 @@
 #!/bin/bash
-input=$1
-output=$2
-if [ -z $1 ]; then
-  echo "Require params - example: ./patch.sh <input file> <output file>"
-  exit
+
+backup_path="/opt/nvidia/libnvidia-encode-backup"
+silent_flag=''
+rollback_flag=''
+
+print_usage() { printf '
+SYNOPSIS
+       patch.sh [OPTION]...
+
+DESCRIPTION
+       The patch for libnvidia-encode to increase encoder sessions
+
+       -s    Silent mode (No output)
+       -r    Rollback to original (Restore lib from backup)
+
+'
+}
+
+while getopts 'rs' flag; do
+  case "${flag}" in
+    r) rollback_flag='true' ;;
+    s) silent_flag='true' ;;
+    *) print_usage
+       exit 1 ;;
+  esac
+done
+
+if [[ $silent_flag ]]; then
+    exec 1> /dev/null
 fi
-sed 's/\x85\xC0\x89\xC5\x75\x18/\x29\xC0\x89\xC5\x90\x90/g' $input > $output
 
+declare -A patch_list=(
+    ["375.39"]='s/\x85\xC0\x89\xC5\x75\x18/\x29\xC0\x89\xC5\x90\x90/g'
+    ["396.24"]='s/\x85\xC0\x89\xC5\x0F\x85\x96\x00\x00\x00/\x29\xC0\x89\xC5\x90\x90\x90\x90\x90\x90/g'
+    # break nvenc.c:236,layout asm,step-mode,step,break *0x00007fff89f9ba45
+    # libnvidia-encode.so @ 0x15a45; test->sub, jne->nop-nop-nop-nop-nop-nop
+)
+
+driver_version=$(/usr/bin/nvidia-smi --query-gpu=driver_version --format=csv,noheader,nounits)
+if [[ ! $? -eq 0 ]]; then
+    echo 'Something went wrong. Check nvidia driver'
+    exit 1;
+fi
+
+echo "Detected nvidia driver version: $driver_version"
+
+patch=${patch_list[$driver_version]}
+
+if [[ ! $patch ]]; then
+    echo "Patch for this ($driver_version) nvidia driver not found." 1>&2
+    echo "Available patches for: " 1>&2
+    for drv in "${!patch_list[@]}"; do
+        echo "$drv" 1>&2
+    done
+    exit 1;
+fi
+
+if [[ $rollback_flag ]]; then
+    if [[ -f $backup_path/libnvidia-encode.so.$driver_version ]]; then
+        cp $backup_path/libnvidia-encode.so.$driver_version \
+           /usr/lib/x86_64-linux-gnu/libnvidia-encode.so.$driver_version
+        echo "Restore from backup libnvidia-encode.so.$driver_version"
+    else
+        echo "Backup not found. Try to patch first."
+        exit 1;
+    fi
+else
+    if [[ ! -f $backup_path/libnvidia-encode.so.$driver_version ]]; then
+        echo "Attention! Backup not found. Copy current libnvidia-encode to backup."
+        mkdir -p $backup_path
+        cp /usr/lib/x86_64-linux-gnu/libnvidia-encode.so.$driver_version \
+           $backup_path/libnvidia-encode.so.$driver_version
+    fi
+    sha1sum $backup_path/libnvidia-encode.so.$driver_version
+    sed "$patch" $backup_path/libnvidia-encode.so.$driver_version > \
+      /usr/lib/x86_64-linux-gnu/libnvidia-encode.so.$driver_version
+    sha1sum /usr/lib/x86_64-linux-gnu/libnvidia-encode.so.$driver_version
+    ldconfig
+    echo "Patched!"
+fi