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MdeModulePkg: Enhance bus scan for all root bridge instances 

Ref:https://bugzilla.tianocore.org/show_bug.cgi?id=4000

Change flow to bus scan all root bridge instances even when any
one root bridge meet bus resource OUT_OF_RESOURCE case.
thus platform handler  of "EfiPciHostBridgeEndBusAllocation" has
an chance to do relative pci bus rebalance to handle this case.

Signed-off-by: Foster Nong <foster.nong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
This commit is contained in:
Foster Nong 2022-07-22 17:10:26 +08:00 committed by mergify[bot]
parent e76496530c
commit bd06717863
1 changed files with 14 additions and 4 deletions
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18
MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.c
View File

@ -1,7 +1,7 @@
/** @file
Internal library implementation for PCI Bus module.
Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@ -1528,6 +1528,7 @@ PciHostBridgeEnumerator (
UINT8 StartBusNumber;
LIST_ENTRY RootBridgeList;
LIST_ENTRY *Link;
EFI_STATUS RootBridgeEnumerationStatus;
if (FeaturePcdGet (PcdPciBusHotplugDeviceSupport)) {
InitializeHotPlugSupport ();
@ -1545,7 +1546,8 @@ PciHostBridgeEnumerator (
}
DEBUG ((DEBUG_INFO, "PCI Bus First Scanning\n"));
RootBridgeHandle = NULL;
RootBridgeHandle = NULL;
RootBridgeEnumerationStatus = EFI_SUCCESS;
while (PciResAlloc->GetNextRootBridge (PciResAlloc, &RootBridgeHandle) == EFI_SUCCESS) {
//
// if a root bridge instance is found, create root bridge device for it
@ -1572,7 +1574,7 @@ PciHostBridgeEnumerator (
}
if (EFI_ERROR (Status)) {
return Status;
RootBridgeEnumerationStatus = Status;
}
}
@ -1581,6 +1583,10 @@ PciHostBridgeEnumerator (
//
NotifyPhase (PciResAlloc, EfiPciHostBridgeEndBusAllocation);
if (EFI_ERROR (RootBridgeEnumerationStatus)) {
return RootBridgeEnumerationStatus;
}
if ((gPciHotPlugInit != NULL) && FeaturePcdGet (PcdPciBusHotplugDeviceSupport)) {
//
// Reset all assigned PCI bus number in all PPB
@ -1659,7 +1665,7 @@ PciHostBridgeEnumerator (
DestroyRootBridge (RootBridgeDev);
if (EFI_ERROR (Status)) {
return Status;
RootBridgeEnumerationStatus = Status;
}
}
@ -1667,6 +1673,10 @@ PciHostBridgeEnumerator (
// Notify the bus allocation phase is to end for the 2nd time
//
NotifyPhase (PciResAlloc, EfiPciHostBridgeEndBusAllocation);
if (EFI_ERROR (RootBridgeEnumerationStatus)) {
return RootBridgeEnumerationStatus;
}
}
//