X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=MdeModulePkg%2FBus%2FPci%2FPciBusDxe%2FPciDeviceSupport.c;fp=MdeModulePkg%2FBus%2FPci%2FPciBusDxe%2FPciDeviceSupport.c;h=97bb971a5966a2d869d8da42b47cb4e5be386f27;hp=004f2a3b5bb14986409977fb7b2d92366387355b;hb=8315563285719f09f13e69a408f34558fc41c822;hpb=a0a03415d6d44da3a7d84c140444039de992a192

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c
index 004f2a3b5b..97bb971a59 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c
@@ -20,72 +20,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 //
 LIST_ENTRY  mPciDevicePool;
 
-/**
- Disable Bus Master Enable bit in all devices in the list.
-
- @param Devices  A device list.
-**/
-VOID
-DisableBmeOnTree (
-  IN LIST_ENTRY      *Devices
-  )
-{
-  LIST_ENTRY      *Link;
-  PCI_IO_DEVICE   *PciIoDevice;
-  UINT16           Command;
-
-  for ( Link = GetFirstNode (Devices)
-      ; !IsNull (Devices, Link)
-      ; Link = GetNextNode (Devices, Link)
-      ) {
-    PciIoDevice = PCI_IO_DEVICE_FROM_LINK (Link);
-    //
-    // Turn off all children's Bus Master, if any
-    //
-    DisableBmeOnTree (&PciIoDevice->ChildList);
-
-    //
-    // If this is a device that supports BME, disable BME on this device.
-    //
-    if ((PciIoDevice->Supports & EFI_PCI_IO_ATTRIBUTE_BUS_MASTER) != 0) {
-      PCI_READ_COMMAND_REGISTER(PciIoDevice, &Command);
-      if ((Command & EFI_PCI_COMMAND_BUS_MASTER) != 0) {
-        Command &= ~EFI_PCI_COMMAND_BUS_MASTER;
-        PCI_SET_COMMAND_REGISTER (PciIoDevice, Command);
-        DEBUG ((
-          DEBUG_INFO,"  %02x   %02x      %02x         %04x\n",
-          PciIoDevice->BusNumber, PciIoDevice->DeviceNumber, PciIoDevice->FunctionNumber,
-          Command
-          ));
-      }
-    }
-  }
-}
-
-/**
-  Exit Boot Services Event notification handler.
-
-  Disable Bus Master on any that were enabled during BDS.
-
-  @param[in]  Event     Event whose notification function is being invoked.
-  @param[in]  Context   Pointer to the notification function's context.
-
-**/
-VOID
-EFIAPI
-OnExitBootServices (
-  IN      EFI_EVENT                 Event,
-  IN      VOID                      *Context
-  )
-{
-  DEBUG ((
-    DEBUG_INFO,
-    "PciBus: Disable Bus Master of all devices...\n"
-    "  Bus# Device# Function#  NewCommand\n"
-    ));
-  DisableBmeOnTree(&mPciDevicePool);
-}
-
 /**
   Initialize the PCI devices pool.
 
@@ -95,27 +29,7 @@ InitializePciDevicePool (
   VOID
   )
 {
-  EFI_EVENT   ExitBootServicesEvent;
-  EFI_STATUS  Status;
-
   InitializeListHead (&mPciDevicePool);
-
-  //
-  // DisableBME on ExitBootServices should be synchonized with any IOMMU ExitBootServices routine.
-  // DisableBME should be run before the IOMMU protections are disabled.
-  // One way to do this is to ensure that the IOMMU ExitBootServices callback runs at TPL_CALLBACK.
-  //
-  Status = gBS->CreateEventEx (
-                  EVT_NOTIFY_SIGNAL,
-                  TPL_NOTIFY,
-                  OnExitBootServices,
-                  NULL,
-                  &gEfiEventExitBootServicesGuid,
-                  &ExitBootServicesEvent
-                  );
-  if (EFI_ERROR (Status)) {
-    DEBUG ((DEBUG_ERROR, "PciBus: Unable to hook ExitBootServices event - %r\n", Status));
-  }
 }
 
 /**