From 81609c7695abae7ced08d061c2f86c538e0309a7 Mon Sep 17 00:00:00 2001
From: Lukasz Jobczyk <lukasz.jobczyk@intel.com>
Date: Mon, 9 Aug 2021 14:33:44 +0000
Subject: [PATCH] Use bind fence atomically

Signed-off-by: Lukasz Jobczyk <lukasz.jobczyk@intel.com>
---
 shared/source/os_interface/linux/drm_neo.cpp | 4 ++++
 shared/source/os_interface/linux/drm_neo.h   | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/shared/source/os_interface/linux/drm_neo.cpp b/shared/source/os_interface/linux/drm_neo.cpp
index 0b1d99537f..233eaf093c 100644
--- a/shared/source/os_interface/linux/drm_neo.cpp
+++ b/shared/source/os_interface/linux/drm_neo.cpp
@@ -420,6 +420,10 @@ int Drm::queryVmId(uint32_t drmContextId, uint32_t &vmId) {
     return retVal;
 }
 
+std::unique_lock<std::mutex> Drm::lockBindFenceMutex() {
+    return std::unique_lock<std::mutex>(this->bindFenceMutex);
+}
+
 int Drm::getEuTotal(int &euTotal) {
     return getParamIoctl(I915_PARAM_EU_TOTAL, &euTotal);
 }
diff --git a/shared/source/os_interface/linux/drm_neo.h b/shared/source/os_interface/linux/drm_neo.h
index 68c2f5ba7c..e9a87d6b7c 100644
--- a/shared/source/os_interface/linux/drm_neo.h
+++ b/shared/source/os_interface/linux/drm_neo.h
@@ -230,6 +230,8 @@ class Drm : public DriverModel {
 
     static std::vector<std::unique_ptr<HwDeviceId>> discoverDevices(ExecutionEnvironment &executionEnvironment);
 
+    std::unique_lock<std::mutex> lockBindFenceMutex();
+
   protected:
     Drm(std::unique_ptr<HwDeviceIdDrm> hwDeviceIdIn, RootDeviceEnvironment &rootDeviceEnvironment);
 
@@ -275,6 +277,7 @@ class Drm : public DriverModel {
     TopologyMap topologyMap;
     std::unordered_map<unsigned long, std::pair<long long, uint64_t>> ioctlStatistics;
 
+    std::mutex bindFenceMutex;
     std::array<uint64_t, EngineLimits::maxHandleCount> pagingFence;
     std::array<uint64_t, EngineLimits::maxHandleCount> fenceVal;
     StackVec<uint32_t, size_t(ResourceClass::MaxSize)> classHandles;