/** @file
Supporting functions implementaion for PCI devices management.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.
(C) Copyright 2018 Hewlett Packard Enterprise Development LP
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
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "PciBus.h"
//
// This device structure is serviced as a header.
// Its next field points to the first root bridge device node.
//
LIST_ENTRY mPciDevicePool;
/**
Initialize the PCI devices pool.
**/
VOID
InitializePciDevicePool (
VOID
)
{
InitializeListHead (&mPciDevicePool);
}
/**
Insert a root bridge into PCI device pool.
@param RootBridge A pointer to the PCI_IO_DEVICE.
**/
VOID
InsertRootBridge (
IN PCI_IO_DEVICE *RootBridge
)
{
InsertTailList (&mPciDevicePool, &(RootBridge->Link));
}
/**
This function is used to insert a PCI device node under
a bridge.
@param Bridge The PCI bridge.
@param PciDeviceNode The PCI device needs inserting.
**/
VOID
InsertPciDevice (
IN PCI_IO_DEVICE *Bridge,
IN PCI_IO_DEVICE *PciDeviceNode
)
{
InsertTailList (&Bridge->ChildList, &(PciDeviceNode->Link));
PciDeviceNode->Parent = Bridge;
}
/**
Destroy root bridge and remove it from deivce tree.
@param RootBridge The bridge want to be removed.
**/
VOID
DestroyRootBridge (
IN PCI_IO_DEVICE *RootBridge
)
{
DestroyPciDeviceTree (RootBridge);
FreePciDevice (RootBridge);
}
/**
Destroy a pci device node.
All direct or indirect allocated resource for this node will be freed.
@param PciIoDevice A pointer to the PCI_IO_DEVICE to be destoried.
**/
VOID
FreePciDevice (
IN PCI_IO_DEVICE *PciIoDevice
)
{
ASSERT (PciIoDevice != NULL);
//
// Assume all children have been removed underneath this device
//
if (PciIoDevice->ResourcePaddingDescriptors != NULL) {
FreePool (PciIoDevice->ResourcePaddingDescriptors);
}
if (PciIoDevice->DevicePath != NULL) {
FreePool (PciIoDevice->DevicePath);
}
if (PciIoDevice->BusNumberRanges != NULL) {
FreePool (PciIoDevice->BusNumberRanges);
}
FreePool (PciIoDevice);
}
/**
Destroy all the pci device node under the bridge.
Bridge itself is not included.
@param Bridge A pointer to the PCI_IO_DEVICE.
**/
VOID
DestroyPciDeviceTree (
IN PCI_IO_DEVICE *Bridge
)
{
LIST_ENTRY *CurrentLink;
PCI_IO_DEVICE *Temp;
while (!IsListEmpty (&Bridge->ChildList)) {
CurrentLink = Bridge->ChildList.ForwardLink;
//
// Remove this node from the linked list
//
RemoveEntryList (CurrentLink);
Temp = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
if (!IsListEmpty (&Temp->ChildList)) {
DestroyPciDeviceTree (Temp);
}
FreePciDevice (Temp);
}
}
/**
Destroy all device nodes under the root bridge
specified by Controller.
The root bridge itself is also included.
@param Controller Root bridge handle.
@retval EFI_SUCCESS Destory all devcie nodes successfully.
@retval EFI_NOT_FOUND Cannot find any PCI device under specified
root bridge.
**/
EFI_STATUS
DestroyRootBridgeByHandle (
IN EFI_HANDLE Controller
)
{
LIST_ENTRY *CurrentLink;
PCI_IO_DEVICE *Temp;
CurrentLink = mPciDevicePool.ForwardLink;
while (CurrentLink != NULL && CurrentLink != &mPciDevicePool) {
Temp = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
if (Temp->Handle == Controller) {
RemoveEntryList (CurrentLink);
DestroyPciDeviceTree (Temp);
FreePciDevice (Temp);
return EFI_SUCCESS;
}
CurrentLink = CurrentLink->ForwardLink;
}
return EFI_NOT_FOUND;
}
/**
This function registers the PCI IO device.
It creates a handle for this PCI IO device (if the handle does not exist), attaches
appropriate protocols onto the handle, does necessary initialization, and sets up
parent/child relationship with its bus controller.
@param Controller An EFI handle for the PCI bus controller.
@param PciIoDevice A PCI_IO_DEVICE pointer to the PCI IO device to be registered.
@param Handle A pointer to hold the returned EFI handle for the PCI IO device.
@retval EFI_SUCCESS The PCI device is successfully registered.
@retval other An error occurred when registering the PCI device.
**/
EFI_STATUS
RegisterPciDevice (
IN EFI_HANDLE Controller,
IN PCI_IO_DEVICE *PciIoDevice,
OUT EFI_HANDLE *Handle OPTIONAL
)
{
EFI_STATUS Status;
VOID *PlatformOpRomBuffer;
UINTN PlatformOpRomSize;
EFI_PCI_IO_PROTOCOL *PciIo;
UINT8 Data8;
BOOLEAN HasEfiImage;
//
// Install the pciio protocol, device path protocol
//
Status = gBS->InstallMultipleProtocolInterfaces (
&PciIoDevice->Handle,
&gEfiDevicePathProtocolGuid,
PciIoDevice->DevicePath,
&gEfiPciIoProtocolGuid,
&PciIoDevice->PciIo,
NULL
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Force Interrupt line to "Unknown" or "No Connection"
//
PciIo = &(PciIoDevice->PciIo);
Data8 = PCI_INT_LINE_UNKNOWN;
PciIo->Pci.Write (PciIo, EfiPciIoWidthUint8, 0x3C, 1, &Data8);
//
// Process OpRom
//
if (!PciIoDevice->AllOpRomProcessed) {
//
// Get the OpRom provided by platform
//
if (gPciPlatformProtocol != NULL) {
Status = gPciPlatformProtocol->GetPciRom (
gPciPlatformProtocol,
PciIoDevice->Handle,
&PlatformOpRomBuffer,
&PlatformOpRomSize
);
if (!EFI_ERROR (Status)) {
PciIoDevice->EmbeddedRom = FALSE;
PciIoDevice->RomSize = PlatformOpRomSize;
PciIoDevice->PciIo.RomSize = PlatformOpRomSize;
PciIoDevice->PciIo.RomImage = PlatformOpRomBuffer;
//
// For OpROM read from gPciPlatformProtocol:
// Add the Rom Image to internal database for later PCI light enumeration
//
PciRomAddImageMapping (
NULL,
PciIoDevice->PciRootBridgeIo->SegmentNumber,
PciIoDevice->BusNumber,
PciIoDevice->DeviceNumber,
PciIoDevice->FunctionNumber,
PciIoDevice->PciIo.RomImage,
PciIoDevice->PciIo.RomSize
);
}
} else if (gPciOverrideProtocol != NULL) {
Status = gPciOverrideProtocol->GetPciRom (
gPciOverrideProtocol,
PciIoDevice->Handle,
&PlatformOpRomBuffer,
&PlatformOpRomSize
);
if (!EFI_ERROR (Status)) {
PciIoDevice->EmbeddedRom = FALSE;
PciIoDevice->RomSize = PlatformOpRomSize;
PciIoDevice->PciIo.RomSize = PlatformOpRomSize;
PciIoDevice->PciIo.RomImage = PlatformOpRomBuffer;
//
// For OpROM read from gPciOverrideProtocol:
// Add the Rom Image to internal database for later PCI light enumeration
//
PciRomAddImageMapping (
NULL,
PciIoDevice->PciRootBridgeIo->SegmentNumber,
PciIoDevice->BusNumber,
PciIoDevice->DeviceNumber,
PciIoDevice->FunctionNumber,
PciIoDevice->PciIo.RomImage,
PciIoDevice->PciIo.RomSize
);
}
}
}
//
// Determine if there are EFI images in the option rom
//
HasEfiImage = ContainEfiImage (PciIoDevice->PciIo.RomImage, PciIoDevice->PciIo.RomSize);
if (HasEfiImage) {
Status = gBS->InstallMultipleProtocolInterfaces (
&PciIoDevice->Handle,
&gEfiLoadFile2ProtocolGuid,
&PciIoDevice->LoadFile2,
NULL
);
if (EFI_ERROR (Status)) {
gBS->UninstallMultipleProtocolInterfaces (
&PciIoDevice->Handle,
&gEfiDevicePathProtocolGuid,
PciIoDevice->DevicePath,
&gEfiPciIoProtocolGuid,
&PciIoDevice->PciIo,
NULL
);
return Status;
}
}
if (!PciIoDevice->AllOpRomProcessed) {
PciIoDevice->AllOpRomProcessed = TRUE;
//
// Dispatch the EFI OpRom for the PCI device.
// The OpRom is got from platform in the above code
// or loaded from device in the previous round of bus enumeration
//
if (HasEfiImage) {
ProcessOpRomImage (PciIoDevice);
}
}
if (PciIoDevice->BusOverride) {
//
// Install Bus Specific Driver Override Protocol
//
Status = gBS->InstallMultipleProtocolInterfaces (
&PciIoDevice->Handle,
&gEfiBusSpecificDriverOverrideProtocolGuid,
&PciIoDevice->PciDriverOverride,
NULL
);
if (EFI_ERROR (Status)) {
gBS->UninstallMultipleProtocolInterfaces (
&PciIoDevice->Handle,
&gEfiDevicePathProtocolGuid,
PciIoDevice->DevicePath,
&gEfiPciIoProtocolGuid,
&PciIoDevice->PciIo,
NULL
);
if (HasEfiImage) {
gBS->UninstallMultipleProtocolInterfaces (
&PciIoDevice->Handle,
&gEfiLoadFile2ProtocolGuid,
&PciIoDevice->LoadFile2,
NULL
);
}
return Status;
}
}
Status = gBS->OpenProtocol (
Controller,
&gEfiPciRootBridgeIoProtocolGuid,
(VOID **) &(PciIoDevice->PciRootBridgeIo),
gPciBusDriverBinding.DriverBindingHandle,
PciIoDevice->Handle,
EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
);
if (EFI_ERROR (Status)) {
return Status;
}
if (Handle != NULL) {
*Handle = PciIoDevice->Handle;
}
//
// Indicate the pci device is registered
//
PciIoDevice->Registered = TRUE;
return EFI_SUCCESS;
}
/**
This function is used to remove the whole PCI devices on the specified bridge from
the root bridge.
@param RootBridgeHandle The root bridge device handle.
@param Bridge The bridge device to be removed.
**/
VOID
RemoveAllPciDeviceOnBridge (
EFI_HANDLE RootBridgeHandle,
PCI_IO_DEVICE *Bridge
)
{
LIST_ENTRY *CurrentLink;
PCI_IO_DEVICE *Temp;
while (!IsListEmpty (&Bridge->ChildList)) {
CurrentLink = Bridge->ChildList.ForwardLink;
Temp = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
//
// Check if the current node has been deregistered before
// If it is not, then deregister it
//
if (Temp->Registered) {
DeRegisterPciDevice (RootBridgeHandle, Temp->Handle);
}
//
// Remove this node from the linked list
//
RemoveEntryList (CurrentLink);
if (!IsListEmpty (&Temp->ChildList)) {
RemoveAllPciDeviceOnBridge (RootBridgeHandle, Temp);
}
FreePciDevice (Temp);
}
}
/**
This function is used to de-register the PCI IO device.
That includes un-installing PciIo protocol from the specified PCI
device handle.
@param Controller An EFI handle for the PCI bus controller.
@param Handle PCI device handle.
@retval EFI_SUCCESS The PCI device is successfully de-registered.
@retval other An error occurred when de-registering the PCI device.
**/
EFI_STATUS
DeRegisterPciDevice (
IN EFI_HANDLE Controller,
IN EFI_HANDLE Handle
)
{
EFI_PCI_IO_PROTOCOL *PciIo;
EFI_STATUS Status;
PCI_IO_DEVICE *PciIoDevice;
PCI_IO_DEVICE *Node;
LIST_ENTRY *CurrentLink;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;
Status = gBS->OpenProtocol (
Handle,
&gEfiPciIoProtocolGuid,
(VOID **) &PciIo,
gPciBusDriverBinding.DriverBindingHandle,
Controller,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (!EFI_ERROR (Status)) {
PciIoDevice = PCI_IO_DEVICE_FROM_PCI_IO_THIS (PciIo);
//
// If it is already de-registered
//
if (!PciIoDevice->Registered) {
return EFI_SUCCESS;
}
//
// If it is PPB, first de-register its children
//
if (!IsListEmpty (&PciIoDevice->ChildList)) {
CurrentLink = PciIoDevice->ChildList.ForwardLink;
while (CurrentLink != NULL && CurrentLink != &PciIoDevice->ChildList) {
Node = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
Status = DeRegisterPciDevice (Controller, Node->Handle);
if (EFI_ERROR (Status)) {
return Status;
}
CurrentLink = CurrentLink->ForwardLink;
}
}
//
// Close the child handle
//
Status = gBS->CloseProtocol (
Controller,
&gEfiPciRootBridgeIoProtocolGuid,
gPciBusDriverBinding.DriverBindingHandle,
Handle
);
//
// Un-install the Device Path protocol and PCI I/O protocol
// and Bus Specific Driver Override protocol if needed.
//
if (PciIoDevice->BusOverride) {
Status = gBS->UninstallMultipleProtocolInterfaces (
Handle,
&gEfiDevicePathProtocolGuid,
PciIoDevice->DevicePath,
&gEfiPciIoProtocolGuid,
&PciIoDevice->PciIo,
&gEfiBusSpecificDriverOverrideProtocolGuid,
&PciIoDevice->PciDriverOverride,
NULL
);
} else {
Status = gBS->UninstallMultipleProtocolInterfaces (
Handle,
&gEfiDevicePathProtocolGuid,
PciIoDevice->DevicePath,
&gEfiPciIoProtocolGuid,
&PciIoDevice->PciIo,
NULL
);
}
if (!EFI_ERROR (Status)) {
//
// Try to uninstall LoadFile2 protocol if exists
//
Status = gBS->OpenProtocol (
Handle,
&gEfiLoadFile2ProtocolGuid,
NULL,
gPciBusDriverBinding.DriverBindingHandle,
Controller,
EFI_OPEN_PROTOCOL_TEST_PROTOCOL
);
if (!EFI_ERROR (Status)) {
Status = gBS->UninstallMultipleProtocolInterfaces (
Handle,
&gEfiLoadFile2ProtocolGuid,
&PciIoDevice->LoadFile2,
NULL
);
}
//
// Restore Status
//
Status = EFI_SUCCESS;
}
if (EFI_ERROR (Status)) {
gBS->OpenProtocol (
Controller,
&gEfiPciRootBridgeIoProtocolGuid,
(VOID **) &PciRootBridgeIo,
gPciBusDriverBinding.DriverBindingHandle,
Handle,
EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
);
return Status;
}
//
// The Device Driver should disable this device after disconnect
// so the Pci Bus driver will not touch this device any more.
// Restore the register field to the original value
//
PciIoDevice->Registered = FALSE;
PciIoDevice->Handle = NULL;
} else {
//
// Handle may be closed before
//
return EFI_SUCCESS;
}
return EFI_SUCCESS;
}
/**
Start to manage the PCI device on the specified root bridge or PCI-PCI Bridge.
@param Controller The root bridge handle.
@param RootBridge A pointer to the PCI_IO_DEVICE.
@param RemainingDevicePath A pointer to the EFI_DEVICE_PATH_PROTOCOL.
@param NumberOfChildren Children number.
@param ChildHandleBuffer A pointer to the child handle buffer.
@retval EFI_NOT_READY Device is not allocated.
@retval EFI_UNSUPPORTED Device only support PCI-PCI bridge.
@retval EFI_NOT_FOUND Can not find the specific device.
@retval EFI_SUCCESS Success to start Pci devices on bridge.
**/
EFI_STATUS
StartPciDevicesOnBridge (
IN EFI_HANDLE Controller,
IN PCI_IO_DEVICE *RootBridge,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath,
IN OUT UINT8 *NumberOfChildren,
IN OUT EFI_HANDLE *ChildHandleBuffer
)
{
PCI_IO_DEVICE *PciIoDevice;
EFI_DEV_PATH_PTR Node;
EFI_DEVICE_PATH_PROTOCOL *CurrentDevicePath;
EFI_STATUS Status;
LIST_ENTRY *CurrentLink;
UINT64 Supports;
PciIoDevice = NULL;
CurrentLink = RootBridge->ChildList.ForwardLink;
while (CurrentLink != NULL && CurrentLink != &RootBridge->ChildList) {
PciIoDevice = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
if (RemainingDevicePath != NULL) {
Node.DevPath = RemainingDevicePath;
if (Node.Pci->Device != PciIoDevice->DeviceNumber ||
Node.Pci->Function != PciIoDevice->FunctionNumber) {
CurrentLink = CurrentLink->ForwardLink;
continue;
}
//
// Check if the device has been assigned with required resource
//
if (!PciIoDevice->Allocated) {
return EFI_NOT_READY;
}
//
// Check if the current node has been registered before
// If it is not, register it
//
if (!PciIoDevice->Registered) {
Status = RegisterPciDevice (
Controller,
PciIoDevice,
NULL
);
}
if (NumberOfChildren != NULL && ChildHandleBuffer != NULL && PciIoDevice->Registered) {
ChildHandleBuffer[*NumberOfChildren] = PciIoDevice->Handle;
(*NumberOfChildren)++;
}
//
// Get the next device path
//
CurrentDevicePath = NextDevicePathNode (RemainingDevicePath);
if (IsDevicePathEnd (CurrentDevicePath)) {
return EFI_SUCCESS;
}
//
// If it is a PPB
//
if (IS_PCI_BRIDGE (&PciIoDevice->Pci)) {
Status = StartPciDevicesOnBridge (
Controller,
PciIoDevice,
CurrentDevicePath,
NumberOfChildren,
ChildHandleBuffer
);
PciIoDevice->PciIo.Attributes (
&(PciIoDevice->PciIo),
EfiPciIoAttributeOperationSupported,
0,
&Supports
);
Supports &= (UINT64)EFI_PCI_DEVICE_ENABLE;
PciIoDevice->PciIo.Attributes (
&(PciIoDevice->PciIo),
EfiPciIoAttributeOperationEnable,
Supports,
NULL
);
return Status;
} else {
//
// Currently, the PCI bus driver only support PCI-PCI bridge
//
return EFI_UNSUPPORTED;
}
} else {
//
// If remaining device path is NULL,
// try to enable all the pci devices under this bridge
//
if (!PciIoDevice->Registered && PciIoDevice->Allocated) {
Status = RegisterPciDevice (
Controller,
PciIoDevice,
NULL
);
}
if (NumberOfChildren != NULL && ChildHandleBuffer != NULL && PciIoDevice->Registered) {
ChildHandleBuffer[*NumberOfChildren] = PciIoDevice->Handle;
(*NumberOfChildren)++;
}
if (IS_PCI_BRIDGE (&PciIoDevice->Pci)) {
Status = StartPciDevicesOnBridge (
Controller,
PciIoDevice,
RemainingDevicePath,
NumberOfChildren,
ChildHandleBuffer
);
PciIoDevice->PciIo.Attributes (
&(PciIoDevice->PciIo),
EfiPciIoAttributeOperationSupported,
0,
&Supports
);
Supports &= (UINT64)EFI_PCI_DEVICE_ENABLE;
PciIoDevice->PciIo.Attributes (
&(PciIoDevice->PciIo),
EfiPciIoAttributeOperationEnable,
Supports,
NULL
);
}
CurrentLink = CurrentLink->ForwardLink;
}
}
if (PciIoDevice == NULL) {
return EFI_NOT_FOUND;
} else {
return EFI_SUCCESS;
}
}
/**
Start to manage all the PCI devices it found previously under
the entire host bridge.
@param Controller The root bridge handle.
@retval EFI_NOT_READY Device is not allocated.
@retval EFI_SUCCESS Success to start Pci device on host bridge.
**/
EFI_STATUS
StartPciDevices (
IN EFI_HANDLE Controller
)
{
PCI_IO_DEVICE *RootBridge;
EFI_HANDLE ThisHostBridge;
LIST_ENTRY *CurrentLink;
RootBridge = GetRootBridgeByHandle (Controller);
ASSERT (RootBridge != NULL);
ThisHostBridge = RootBridge->PciRootBridgeIo->ParentHandle;
CurrentLink = mPciDevicePool.ForwardLink;
while (CurrentLink != NULL && CurrentLink != &mPciDevicePool) {
RootBridge = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
//
// Locate the right root bridge to start
//
if (RootBridge->PciRootBridgeIo->ParentHandle == ThisHostBridge) {
StartPciDevicesOnBridge (
RootBridge->Handle,
RootBridge,
NULL,
NULL,
NULL
);
}
CurrentLink = CurrentLink->ForwardLink;
}
return EFI_SUCCESS;
}
/**
Create root bridge device.
@param RootBridgeHandle Specified root bridge hanle.
@return The crated root bridge device instance, NULL means no
root bridge device instance created.
**/
PCI_IO_DEVICE *
CreateRootBridge (
IN EFI_HANDLE RootBridgeHandle
)
{
EFI_STATUS Status;
PCI_IO_DEVICE *Dev;
EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;
Dev = AllocateZeroPool (sizeof (PCI_IO_DEVICE));
if (Dev == NULL) {
return NULL;
}
Dev->Signature = PCI_IO_DEVICE_SIGNATURE;
Dev->Handle = RootBridgeHandle;
InitializeListHead (&Dev->ChildList);
Status = gBS->OpenProtocol (
RootBridgeHandle,
&gEfiDevicePathProtocolGuid,
(VOID **) &ParentDevicePath,
gPciBusDriverBinding.DriverBindingHandle,
RootBridgeHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
FreePool (Dev);
return NULL;
}
//
// Record the root bridge parent device path
//
Dev->DevicePath = DuplicateDevicePath (ParentDevicePath);
//
// Get the pci root bridge io protocol
//
Status = gBS->OpenProtocol (
RootBridgeHandle,
&gEfiPciRootBridgeIoProtocolGuid,
(VOID **) &PciRootBridgeIo,
gPciBusDriverBinding.DriverBindingHandle,
RootBridgeHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
FreePciDevice (Dev);
return NULL;
}
Dev->PciRootBridgeIo = PciRootBridgeIo;
//
// Initialize the PCI I/O instance structure
//
InitializePciIoInstance (Dev);
InitializePciDriverOverrideInstance (Dev);
InitializePciLoadFile2 (Dev);
//
// Initialize reserved resource list and
// option rom driver list
//
InitializeListHead (&Dev->ReservedResourceList);
InitializeListHead (&Dev->OptionRomDriverList);
return Dev;
}
/**
Get root bridge device instance by specific root bridge handle.
@param RootBridgeHandle Given root bridge handle.
@return The root bridge device instance, NULL means no root bridge
device instance found.
**/
PCI_IO_DEVICE *
GetRootBridgeByHandle (
EFI_HANDLE RootBridgeHandle
)
{
PCI_IO_DEVICE *RootBridgeDev;
LIST_ENTRY *CurrentLink;
CurrentLink = mPciDevicePool.ForwardLink;
while (CurrentLink != NULL && CurrentLink != &mPciDevicePool) {
RootBridgeDev = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
if (RootBridgeDev->Handle == RootBridgeHandle) {
return RootBridgeDev;
}
CurrentLink = CurrentLink->ForwardLink;
}
return NULL;
}
/**
Judege whether Pci device existed.
@param Bridge Parent bridege instance.
@param PciIoDevice Device instance.
@retval TRUE Pci device existed.
@retval FALSE Pci device did not exist.
**/
BOOLEAN
PciDeviceExisted (
IN PCI_IO_DEVICE *Bridge,
IN PCI_IO_DEVICE *PciIoDevice
)
{
PCI_IO_DEVICE *Temp;
LIST_ENTRY *CurrentLink;
CurrentLink = Bridge->ChildList.ForwardLink;
while (CurrentLink != NULL && CurrentLink != &Bridge->ChildList) {
Temp = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
if (Temp == PciIoDevice) {
return TRUE;
}
if (!IsListEmpty (&Temp->ChildList)) {
if (PciDeviceExisted (Temp, PciIoDevice)) {
return TRUE;
}
}
CurrentLink = CurrentLink->ForwardLink;
}
return FALSE;
}
/**
Get the active VGA device on the specified Host Bridge.
@param HostBridgeHandle Host Bridge handle.
@return The active VGA device on the specified Host Bridge.
**/
PCI_IO_DEVICE *
LocateVgaDeviceOnHostBridge (
IN EFI_HANDLE HostBridgeHandle
)
{
LIST_ENTRY *CurrentLink;
PCI_IO_DEVICE *PciIoDevice;
CurrentLink = mPciDevicePool.ForwardLink;
while (CurrentLink != NULL && CurrentLink != &mPciDevicePool) {
PciIoDevice = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
if (PciIoDevice->PciRootBridgeIo->ParentHandle== HostBridgeHandle) {
PciIoDevice = LocateVgaDevice (PciIoDevice);
if (PciIoDevice != NULL) {
return PciIoDevice;
}
}
CurrentLink = CurrentLink->ForwardLink;
}
return NULL;
}
/**
Locate the active VGA device under the bridge.
@param Bridge PCI IO instance for the bridge.
@return The active VGA device.
**/
PCI_IO_DEVICE *
LocateVgaDevice (
IN PCI_IO_DEVICE *Bridge
)
{
LIST_ENTRY *CurrentLink;
PCI_IO_DEVICE *PciIoDevice;
CurrentLink = Bridge->ChildList.ForwardLink;
while (CurrentLink != NULL && CurrentLink != &Bridge->ChildList) {
PciIoDevice = PCI_IO_DEVICE_FROM_LINK (CurrentLink);
if (IS_PCI_VGA(&PciIoDevice->Pci) &&
(PciIoDevice->Attributes &
(EFI_PCI_IO_ATTRIBUTE_VGA_MEMORY |
EFI_PCI_IO_ATTRIBUTE_VGA_IO |
EFI_PCI_IO_ATTRIBUTE_VGA_IO_16)) != 0) {
return PciIoDevice;
}
if (IS_PCI_BRIDGE (&PciIoDevice->Pci)) {
PciIoDevice = LocateVgaDevice (PciIoDevice);
if (PciIoDevice != NULL) {
return PciIoDevice;
}
}
CurrentLink = CurrentLink->ForwardLink;
}
return NULL;
}