MdeModulePkg: Enable SATA Controller PCI mem space

The SATA controller driver crashes while accessing the
PCI memory [AHCI Base Registers (ABAR)], as the PCI memory
space is not enabled.

Enable the PCI memory space access to prevent the SATA
Controller driver from crashing.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>

MdeModulePkg/Bus/Pci/SataControllerDxe/SataController.c

@@ -2,6 +2,7 @@
   This driver module produces IDE_CONTROLLER_INIT protocol for Sata Controllers.
 
   Copyright (c) 2011 - 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2018, ARM Ltd. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -364,6 +365,7 @@ SataControllerStart (
   EFI_SATA_CONTROLLER_PRIVATE_DATA  *Private;
   UINT32                            Data32;
   UINTN                             TotalCount;
+  UINT64                            Supports;
 
   DEBUG ((EFI_D_INFO, "SataControllerStart start\n"));
 
@@ -406,6 +408,52 @@ SataControllerStart (
   Private->IdeInit.CalculateMode  = IdeInitCalculateMode;
   Private->IdeInit.SetTiming      = IdeInitSetTiming;
   Private->IdeInit.EnumAll        = SATA_ENUMER_ALL;
+  Private->PciAttributesChanged   = FALSE;
+
+  //
+  // Save original PCI attributes
+  //
+  Status = PciIo->Attributes (
+                    PciIo,
+                    EfiPciIoAttributeOperationGet,
+                    0,
+                    &Private->OriginalPciAttributes
+                    );
+  if (EFI_ERROR (Status)) {
+      goto Done;
+  }
+
+  DEBUG ((
+    EFI_D_INFO,
+    "Original PCI Attributes = 0x%llx\n",
+    Private->OriginalPciAttributes
+    ));
+
+  Status = PciIo->Attributes (
+                    PciIo,
+                    EfiPciIoAttributeOperationSupported,
+                    0,
+                    &Supports
+                    );
+  if (EFI_ERROR (Status)) {
+    goto Done;
+  }
+
+  DEBUG ((EFI_D_INFO, "Supported PCI Attributes = 0x%llx\n", Supports));
+
+  Supports &= (UINT64)EFI_PCI_DEVICE_ENABLE;
+  Status = PciIo->Attributes (
+                      PciIo,
+                      EfiPciIoAttributeOperationEnable,
+                      Supports,
+                      NULL
+                      );
+  if (EFI_ERROR (Status)) {
+    goto Done;
+  }
+
+  DEBUG ((EFI_D_INFO, "Enabled PCI Attributes = 0x%llx\n", Supports));
+  Private->PciAttributesChanged = TRUE;
 
   Status = PciIo->Pci.Read (
                         PciIo,
@@ -414,7 +462,10 @@ SataControllerStart (
                         sizeof (PciData.Hdr.ClassCode),
                         PciData.Hdr.ClassCode
                         );
-  ASSERT_EFI_ERROR (Status);
+  if (EFI_ERROR (Status)) {
+    ASSERT (FALSE);
+    goto Done;
+  }
 
   if (IS_PCI_IDE (&PciData)) {
     Private->IdeInit.ChannelCount = IDE_MAX_CHANNEL;
@@ -481,6 +532,17 @@ Done:
       if (Private->IdentifyValid != NULL) {
         FreePool (Private->IdentifyValid);
       }
+      if (Private->PciAttributesChanged) {
+        //
+        // Restore original PCI attributes
+        //
+        PciIo->Attributes (
+                 PciIo,
+                 EfiPciIoAttributeOperationSet,
+                 Private->OriginalPciAttributes,
+                 NULL
+                 );
+      }
       FreePool (Private);
     }
   }
@@ -556,6 +618,17 @@ SataControllerStop (
     if (Private->IdentifyValid != NULL) {
       FreePool (Private->IdentifyValid);
     }
+    if (Private->PciAttributesChanged) {
+      //
+      // Restore original PCI attributes
+      //
+      Private->PciIo->Attributes (
+                        Private->PciIo,
+                        EfiPciIoAttributeOperationSet,
+                        Private->OriginalPciAttributes,
+                        NULL
+                        );
+    }
     FreePool (Private);
   }
 

MdeModulePkg/Bus/Pci/SataControllerDxe/SataController.h

@@ -2,6 +2,7 @@
   Header file for Sata Controller driver.
 
   Copyright (c) 2011 - 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2018, ARM Ltd. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -104,6 +105,17 @@ typedef struct _EFI_SATA_CONTROLLER_PRIVATE_DATA {
   //
   EFI_IDENTIFY_DATA                 *IdentifyData;
   BOOLEAN                           *IdentifyValid;
+
+  //
+  // Track the state so that the PCI attributes that were modified
+  // can be restored to the original value later.
+  //
+  BOOLEAN                           PciAttributesChanged;
+
+  //
+  // Copy of the original PCI Attributes
+  //
+  UINT64                            OriginalPciAttributes;
 } EFI_SATA_CONTROLLER_PRIVATE_DATA;
 
 #define SATA_CONTROLLER_PRIVATE_DATA_FROM_THIS(a) CR(a, EFI_SATA_CONTROLLER_PRIVATE_DATA, IdeInit, SATA_CONTROLLER_SIGNATURE)