[PATCH v3 08/13] OvmfPkg/MptScsiDxe: Implement GetTargetLun

["Nikita Leshenko" <nikita.leshchenko@oracle.com>]

Currently we accept only Pun=0 and Lun=0, but we will relax this in a
later patch.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2390
Signed-off-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
---
 OvmfPkg/MptScsiDxe/MptScsi.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/OvmfPkg/MptScsiDxe/MptScsi.c b/OvmfPkg/MptScsiDxe/MptScsi.c
index cba564b5f648..a77599dd4b27 100644
--- a/OvmfPkg/MptScsiDxe/MptScsi.c
+++ b/OvmfPkg/MptScsiDxe/MptScsi.c
@@ -169,7 +169,33 @@ MptScsiGetTargetLun (
   OUT UINT64                                       *Lun
   )
 {
-  return EFI_UNSUPPORTED;
+  SCSI_DEVICE_PATH *ScsiDevicePath;
+
+  if (DevicePath == NULL ||
+      Target == NULL || *Target == NULL || Lun == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (DevicePath->Type    != MESSAGING_DEVICE_PATH ||
+      DevicePath->SubType != MSG_SCSI_DP) {
+    return EFI_UNSUPPORTED;
+  }
+
+  ScsiDevicePath = (SCSI_DEVICE_PATH *)DevicePath;
+  if (ScsiDevicePath->Pun > 0 ||
+      ScsiDevicePath->Lun > 0) {
+    return EFI_NOT_FOUND;
+  }
+
+  ZeroMem (*Target, TARGET_MAX_BYTES);
+  //
+  // This device support 256 targets only, so it's enough to set the LSB
+  // of Target.
+  //
+  **Target = (UINT8)ScsiDevicePath->Pun;
+  *Lun = ScsiDevicePath->Lun;
+
+  return EFI_SUCCESS;
 }
 
 STATIC
-- 
2.20.1