Re: [PATCH 8/9] Ufs: fix to add cache operation

["Tian, Feng" <feng.tian@intel.com>]

Haojian,

The CmdDescHost is a EdkiiUfsHcOperationBusMasterCommonBuffer common buffer, which means Host and DMA could access this region at the same time. So there is no cache coherent issue:)

Thanks
Feng

-----Original Message-----
From: Haojian Zhuang [mailto:haojian.zhuang@linaro.org] 
Sent: Friday, January 6, 2017 2:52 PM
To: Tian, Feng <feng.tian@intel.com>; leif.lindholm@linaro.org; ard.biesheuvel@linaro.org; edk2-devel@lists.01.org
Cc: Haojian Zhuang <haojian.zhuang@linaro.org>
Subject: [PATCH 8/9] Ufs: fix to add cache operation

Since command UPIU is initialized with virtual address that CPU accesses, need to add cache operation.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
---
 MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThru.h      | 1 +
 MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThruDxe.inf | 1 +
 MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThruHci.c   | 8 ++++++++
 3 files changed, 10 insertions(+)

diff --git a/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThru.h b/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThru.h
index 7fc82ba..af13757 100644
--- a/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThru.h
+++ b/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThru.h
@@ -26,6 +26,7 @@
 #include <Library/BaseMemoryLib.h>
 #include <Library/MemoryAllocationLib.h>  #include <Library/UefiBootServicesTableLib.h>
+#include <Library/CacheMaintenanceLib.h>
 #include <Library/DevicePathLib.h>
 #include <Library/TimerLib.h>
 
diff --git a/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThruDxe.inf b/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThruDxe.inf
index c90c72f..254f51a 100644
--- a/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThruDxe.inf
+++ b/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThruDxe.inf
@@ -49,6 +49,7 @@
   BaseMemoryLib
   UefiLib
   BaseLib
+  CacheMaintenanceLib
   UefiDriverEntryPoint
   DebugLib
   DevicePathLib
diff --git a/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThruHci.c b/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThruHci.c
index db70fb1..98a17ac 100644
--- a/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThruHci.c
+++ b/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThruHci.c
@@ -1449,6 +1449,7 @@ UfsExecScsiCmds (
   UTP_TR_PRD                           *PrdtBase;
   EFI_TPL                              OldTpl;
   UFS_PASS_THRU_TRANS_REQ              *TransReq;
+  UINTN                                TotalLen;
 
   TransReq       = AllocateZeroPool (sizeof (UFS_PASS_THRU_TRANS_REQ));
   if (TransReq == NULL) {
@@ -1521,6 +1522,13 @@ UfsExecScsiCmds (
   UfsInitUtpPrdt (PrdtBase, (VOID*)(UINTN)DataBufPhyAddr, DataLen);
 
   //
+  // Flush & invalidate data cache since CmdDescHost is virtual address  
+ // and Command UPIU is updated after Map ().
+  //
+  TotalLen = (TransReq->Trd->PrdtO << 2) + (TransReq->Trd->PrdtL << 2);  
+ WriteBackInvalidateDataCacheRange (TransReq->CmdDescHost, TotalLen);
+
+  //
   // Insert the async SCSI cmd to the Async I/O list
   //
   if (Event != NULL) {
--
2.7.4