From 60cfeeb3b656e746f98620cb99a971ee6310b028 Mon Sep 17 00:00:00 2001
From: Hao Wu <hao.a.wu@intel.com>
Date: Fri, 25 Mar 2016 09:46:58 +0800
Subject: [PATCH] MdeModulePkg NvmExpressDxe: Ensure write-through for NVMe
 write command

Set the Force Unit Access (FUA) bit in NVMe Write - Command Dword 12 to
ensure write-through behavior.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
---
 MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressBlockIo.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressBlockIo.c b/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressBlockIo.c
index 5ac90745bd..92d7d923df 100644
--- a/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressBlockIo.c
+++ b/MdeModulePkg/Bus/Pci/NvmExpressDxe/NvmExpressBlockIo.c
@@ -127,7 +127,10 @@ WriteSectors (
 
   CommandPacket.NvmeCmd->Cdw10 = (UINT32)Lba;
   CommandPacket.NvmeCmd->Cdw11 = (UINT32)RShiftU64(Lba, 32);
-  CommandPacket.NvmeCmd->Cdw12 = (Blocks - 1) & 0xFFFF;
+  //
+  // Set Force Unit Access bit (bit 30) to use write-through behaviour
+  //
+  CommandPacket.NvmeCmd->Cdw12 = ((Blocks - 1) & 0xFFFF) | BIT30;
 
   CommandPacket.MetadataBuffer = NULL;
   CommandPacket.MetadataLength = 0;