[PATCH v5 2/4] MdeModulePkg/UfsPassThruDxe: Check for RPMB W-LUN (SecurityLun)

["Zurcher, Christopher J" <christopher.j.zurcher@intel.com>]

Currently UfsPassThru only checks for 8 common LUNs. This adds a check
for the RPMB Well-known LUN and sets the corresponding bit-mask. Further
handling of the WLUN is already present in the driver.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Christopher J Zurcher <christopher.j.zurcher@intel.com>
---
 MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThru.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThru.c b/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThru.c
index b12404aacb..26c5a8b855 100644
--- a/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThru.c
+++ b/MdeModulePkg/Bus/Ufs/UfsPassThruDxe/UfsPassThru.c
@@ -822,7 +822,9 @@ UfsPassThruDriverBindingStart (
   UINTN                                 UfsHcBase;
   UINT32                                Index;
   UFS_UNIT_DESC                         UnitDescriptor;
+  UFS_DEV_DESC                          DeviceDescriptor;
   UINT32                                UnitDescriptorSize;
+  UINT32                                DeviceDescriptorSize;
 
   Status    = EFI_SUCCESS;
   UfsHc     = NULL;
@@ -916,7 +918,6 @@ UfsPassThruDriverBindingStart (
 
   //
   // Check if 8 common luns are active and set corresponding bit mask.
-  // TODO: Parse device descriptor to decide if exposing RPMB LUN to upper layer for authentication access.
   //
   UnitDescriptorSize = sizeof (UFS_UNIT_DESC);
   for (Index = 0; Index < 8; Index++) {
@@ -931,6 +932,20 @@ UfsPassThruDriverBindingStart (
     }
   }
 
+  //
+  // Check if RPMB WLUN is supported and set corresponding bit mask.
+  //
+  DeviceDescriptorSize = sizeof (UFS_DEV_DESC);
+  Status = UfsRwDeviceDesc (Private, TRUE, UfsDeviceDesc, 0, 0, &DeviceDescriptor, &DeviceDescriptorSize);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "Failed to read device descriptor, status = %r\n", Status));
+  } else {
+    if (DeviceDescriptor.SecurityLun == 0x1) {
+      DEBUG ((DEBUG_INFO, "UFS WLUN RPMB is supported\n"));
+      Private->Luns.BitMask |= BIT11;
+    }
+  }
+
   //
   // Start the asynchronous interrupt monitor
   //
-- 
2.16.2.windows.1