OvmfPkg/XenBusDxe: Open PciIo protocol.

The PciIo interface will be used in "OvmfPkg/XenBusDxe: Add Grant Table
functions" to get the memory address of the BAR 1 and use the space to
map shared memory.

Change in V3:
- add a commit description.

Change in V2:
- Coding style
- Error handler

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16261 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 19 insertions, 0 deletions

diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.c b/OvmfPkg/XenBusDxe/XenBusDxe.c
index 4c638b85f1..776d896368 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.c
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.c
@@ -281,11 +281,25 @@ XenBusDxeDriverBindingStart (
 {

   EFI_STATUS Status;

   XENBUS_DEVICE *Dev;

+  EFI_PCI_IO_PROTOCOL *PciIo;

+

+  Status = gBS->OpenProtocol (

+                     ControllerHandle,

+                     &gEfiPciIoProtocolGuid,

+                     (VOID **) &PciIo,

+                     This->DriverBindingHandle,

+                     ControllerHandle,

+                     EFI_OPEN_PROTOCOL_BY_DRIVER

+                     );

+  if (EFI_ERROR (Status)) {

+    return Status;

+  }

 

   Dev = AllocateZeroPool (sizeof (*Dev));

   Dev->Signature = XENBUS_DEVICE_SIGNATURE;

   Dev->This = This;

   Dev->ControllerHandle = ControllerHandle;

+  Dev->PciIo = PciIo;

 

   EfiAcquireLock (&mMyDeviceLock);

   if (mMyDevice != NULL) {

@@ -323,6 +337,8 @@ XenBusDxeDriverBindingStart (
 

 ErrorAllocated:

   FreePool (Dev);

+  gBS->CloseProtocol (ControllerHandle, &gEfiPciIoProtocolGuid,

+                      This->DriverBindingHandle, ControllerHandle);

   return Status;

 }

 

@@ -365,6 +381,9 @@ XenBusDxeDriverBindingStop (
 

   gBS->CloseEvent (Dev->ExitBootEvent);

 

+  gBS->CloseProtocol (ControllerHandle, &gEfiPciIoProtocolGuid,

+         This->DriverBindingHandle, ControllerHandle);

+

   mMyDevice = NULL;

   FreePool (Dev);

   return EFI_SUCCESS;