Wei Liu
2013-Nov-26 19:25 UTC
[PATCH v3 1/8] MdeModulePkg: introduce PcdPciDisableBusEnumeration
Platforms such as Xen already enumerates PCI bridges and devices. Use
this PCD to control EDK2 behavior.
PcdPciDisableBusEnumeration is placed under [PcdFixedAtBuild,
PcdDynamic, PcdDynamicEx], so that it is possible to alter it during
runtime.
The default setting of this PCD is false (allow full PCI enumeration) to
preserve the same behavior before this change.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c | 5 ++++-
MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf | 1 +
MdeModulePkg/MdeModulePkg.dec | 3 +++
3 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c
b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c
index 5afbb82..cc6be8b 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c
@@ -284,7 +284,10 @@ PciBusDriverBindingStart (
);
}
- gFullEnumeration = (BOOLEAN) ((SearchHostBridgeHandle (Controller) ? FALSE :
TRUE));
+ if (PcdGetBool (PcdPciDisableBusEnumeration))
+ gFullEnumeration = FALSE;
+ else
+ gFullEnumeration = (BOOLEAN) ((SearchHostBridgeHandle (Controller) ? FALSE
: TRUE));
//
// Open Device Path Protocol for PCI root bridge
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf
b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf
index 34eb672..917889c 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf
@@ -108,6 +108,7 @@
gEfiMdeModulePkgTokenSpaceGuid.PcdSrIovSupport
gEfiMdeModulePkgTokenSpaceGuid.PcdAriSupport
gEfiMdeModulePkgTokenSpaceGuid.PcdMrIovSupport
+ gEfiMdeModulePkgTokenSpaceGuid.PcdPciDisableBusEnumeration
# [Event]
# ##
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index b627eb1..e86868b 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -737,6 +737,9 @@
## This PCD specifies whether the Multi Root I/O virtualization support.
gEfiMdeModulePkgTokenSpaceGuid.PcdMrIovSupport|FALSE|BOOLEAN|0x10000046
+ ## This PCD specifies whether full PCI enumeration is disabled.
+
gEfiMdeModulePkgTokenSpaceGuid.PcdPciDisableBusEnumeration|FALSE|BOOLEAN|0x10000048
+
[PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
## Single root I/O virtualization virtual function memory BAR alignment
# BITN set indicates 2 of n+12 power
--
1.7.10.4