From f755fb81f6e07767fc523998f2898b7ede098123 Mon Sep 17 00:00:00 2001
From: Malaya Kumar Parida <malaya.kumar.parida@intel.com>
Date: Tue, 25 Nov 2025 16:06:51 +0530
Subject: [PATCH] ZC v2223 : Skip IddCxSetRealtimeGPUPriority for MTL

Signed-off-by: Malaya Kumar Parida <malaya.kumar.parida@intel.com>
---
 DVServerUMD/DVServer/DVServercommon.h | 11 ++++
 DVServerUMD/DVServer/Driver.cpp       | 84 ++++++++++++++++++++++++---
 DVServerUMD/DVServer/Driver.h         |  6 ++
 3 files changed, 93 insertions(+), 8 deletions(-)

diff --git a/DVServerUMD/DVServer/DVServercommon.h b/DVServerUMD/DVServer/DVServercommon.h
index 269b008..8a9877a 100644
--- a/DVServerUMD/DVServer/DVServercommon.h
+++ b/DVServerUMD/DVServer/DVServercommon.h
@@ -23,4 +23,15 @@
 #define DISP_INFO                  L"Global\\DISP_INFO"
 #define PRIMARY_IDD_INDEX          0
 
+//MTL Device ID Lists
+#define DEV_ID_7D40 0x7D40
+#define DEV_ID_7D45 0x7D45
+#define DEV_ID_7D55 0x7D55
+#define DEV_ID_7D60 0x7D60
+#define DEV_ID_7D67 0x7D67
+#define DEV_ID_7DD5 0x7DD5
+
+constexpr auto DEVICE_ID_REGEX_PATTERN = R"(DEV_([0-9A-Fa-f]{4}))";
+constexpr int MAX_ENUM_ATTEMPTS = 100;  // Prevent infinite loops
+
 #endif /* __DVSERVER_COMMON_H__ */
diff --git a/DVServerUMD/DVServer/Driver.cpp b/DVServerUMD/DVServer/Driver.cpp
index b14bf0f..7a5bca6 100644
--- a/DVServerUMD/DVServer/Driver.cpp
+++ b/DVServerUMD/DVServer/Driver.cpp
@@ -750,15 +750,33 @@ void SwapChainProcessor::RunCore()
 		ERR("IddCxSwapChainSetDevice failed, screen = %d, err = %s\n", m_screen_num, err);
 		return;
 	}
-	if (IDD_IS_FUNCTION_AVAILABLE(IddCxSetRealtimeGPUPriority))
-	{
-		IDARG_IN_SETREALTIMEGPUPRIORITY SetPriority = {};
-		SetPriority.pDevice = DxgiDevice.Get();
-		hr = IddCxSetRealtimeGPUPriority(m_hSwapChain, &SetPriority);
-		if (FAILED(hr)) {
-			ERR("IddCxSetRealtimeGPUPriority failed\n");
+	DWORD gpuDeviceId = GetGpuDeviceId();
+	if (gpuDeviceId != 0)
+		DBGPRINT("GPU PCI Device ID: 0x%04X\n", gpuDeviceId);
+	else
+		DBGPRINT("No GPU PCI Device ID found.\n");
+
+	switch (gpuDeviceId) {
+		case DEV_ID_7D40:
+		case DEV_ID_7D45:
+		case DEV_ID_7D55:
+		case DEV_ID_7D60:
+		case DEV_ID_7D67:
+		case DEV_ID_7DD5:
+			DBGPRINT("IddCxSetRealtimeGPUPriority skipped");
+			break;
+		default:
+			DBGPRINT("IddCxSetRealtimeGPUPriority engaged");
+			if (IDD_IS_FUNCTION_AVAILABLE(IddCxSetRealtimeGPUPriority)) {
+				IDARG_IN_SETREALTIMEGPUPRIORITY SetPriority = {};
+				SetPriority.pDevice = DxgiDevice.Get();
+				hr = IddCxSetRealtimeGPUPriority(m_hSwapChain, &SetPriority);
+				if (FAILED(hr)) {
+					ERR("IddCxSetRealtimeGPUPriority failed\n");
+				}
+			}
+			break;
 		}
-	}
 
 	//reset the resolution flag whenever there is a resolution change
 	m_resolution_changed = TRUE;
@@ -1995,4 +2013,54 @@ bool IsWindows11OrLater()
 	return true;
 }
 
+DWORD GetGpuDeviceId()
+{
+	HDEVINFO deviceInfoSet = SetupDiGetClassDevs(&GUID_DEVCLASS_DISPLAY, nullptr, nullptr, DIGCF_PRESENT);
+	if (deviceInfoSet == INVALID_HANDLE_VALUE) {
+		ERR("SetupDiGetClassDevs failed.\n");
+		return 0;
+	}
+
+	DWORD deviceIdFromPci = 0;
+	SP_DEVINFO_DATA deviceInfoData = {};
+	deviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
+
+	std::regex deviceIdRegex(DEVICE_ID_REGEX_PATTERN);
+	std::smatch match;
+
+	for (DWORD i = 0; i < MAX_ENUM_ATTEMPTS; ++i) {
+		if (!SetupDiEnumDeviceInfo(deviceInfoSet, i, &deviceInfoData))
+			break;
+
+		TCHAR deviceInstanceId[MAX_DEVICE_ID_LEN];
+		if (CM_Get_Device_ID(deviceInfoData.DevInst, deviceInstanceId, MAX_DEVICE_ID_LEN, 0) == CR_SUCCESS) {
+			std::wstring instanceId(deviceInstanceId);
+
+			// Convert wide string to UTF-8
+			int size_needed = WideCharToMultiByte(CP_UTF8, 0, instanceId.c_str(), -1, nullptr, 0, nullptr, nullptr);
+			std::string instanceIdStr(size_needed, 0);
+			WideCharToMultiByte(CP_UTF8, 0, instanceId.c_str(), -1, &instanceIdStr[0], size_needed, nullptr, nullptr);
+
+
+			if (std::regex_search(instanceIdStr, match, deviceIdRegex)) {
+				try {
+					deviceIdFromPci = std::stoul(match[1].str(), nullptr, 16);
+					// Validate range (for safety, PCI Device IDs are 16-bit)
+					if (deviceIdFromPci > 0xFFFF) {
+						ERR("Invalid Device ID extracted: 0x%08X\n", deviceIdFromPci);
+						deviceIdFromPci = 0;
+					}
+					break;
+				}
+				catch (const std::exception&) {
+					ERR("Error parsing Device ID from string: %s\n", match[1].str().c_str());
+				}
+			}
+		}
+	}
+
+	SetupDiDestroyDeviceInfoList(deviceInfoSet);
+
+	return deviceIdFromPci;
+}
 #pragma endregion
diff --git a/DVServerUMD/DVServer/Driver.h b/DVServerUMD/DVServer/Driver.h
index eed6b43..4677a60 100644
--- a/DVServerUMD/DVServer/Driver.h
+++ b/DVServerUMD/DVServer/Driver.h
@@ -15,6 +15,11 @@
 #include <memory>
 #include <vector>
 
+#include <devguid.h>
+#include <string>
+#include <regex>
+#include <cfgmgr32.h>
+
 #include "Trace.h"
 #include "DVServeredid.h"
 #include "..\..\DVServerKMD\Public.h"
@@ -197,6 +202,7 @@ namespace Microsoft
 int hpd_event_create(IDDCX_ADAPTER AdapterObject);
 int get_hpd_data(HANDLE devHandle, struct hp_info* data);
 bool IsWindows11OrLater();
+DWORD GetGpuDeviceId();
 struct disp_info {
 	int disp_count;
 	HANDLE mutex;