From dc080d3b61e570e7a3163fc24afa6f8388d0c0bf Mon Sep 17 00:00:00 2001
From: Heyi Guo <heyi.guo@linaro.org>
Date: Thu, 8 Feb 2018 11:13:27 +0800
Subject: [PATCH 1/1] MdeModulePkg/PciBus: return CPU address for
 GetBarAttributes

According to UEFI spec 2.7, PciIo->GetBarAttributes should return host
address (CPU view ddress) rather than device address (PCI view
address), and
device address = host address + address translation offset,
so we subtract translation from device address before returning.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Heyi Guo <heyi.guo@linaro.org>
Signed-off-by: Yi Li <phoenix.liyi@huawei.com>
Reviewed-by: Ni Ruiyu <ruiyu.ni@intel.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c
index fef3eceb7f..62179eb44b 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c
@@ -1972,6 +1972,10 @@ PciIoGetBarAttributes (
         return EFI_UNSUPPORTED;
       }
     }
+
+    // According to UEFI spec 2.7, we need return host address for
+    // PciIo->GetBarAttributes, and host address = device address - translation.
+    Descriptor->AddrRangeMin -= Descriptor->AddrTranslationOffset;
   }
 
   return EFI_SUCCESS;
-- 
2.39.2