[mirror_edk2.git] / MdeModulePkg / Bus / Pci / PciBusDxe / PciBus.c

/** @file\r
  Driver Binding functions for PCI Bus module.\r
\r
  Single PCI bus driver instance will manager all PCI Root Bridges in one EFI based firmware,\r
  since all PCI Root Bridges' resources need to be managed together.\r
  Supported() function will try to get PCI Root Bridge IO Protocol.\r
  Start() function will get PCI Host Bridge Resource Allocation Protocol to manage all\r
  PCI Root Bridges. So it means platform needs install PCI Root Bridge IO protocol for each\r
  PCI Root Bus and install PCI Host Bridge Resource Allocation Protocol.\r
\r
Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "PciBus.h"\r
\r
//\r
// PCI Bus Driver Global Variables\r
//\r
EFI_DRIVER_BINDING_PROTOCOL  gPciBusDriverBinding = {\r
  PciBusDriverBindingSupported,\r
  PciBusDriverBindingStart,\r
  PciBusDriverBindingStop,\r
  0xa,\r
  NULL,\r
  NULL\r
};\r
\r
EFI_HANDLE                                    gPciHostBrigeHandles[PCI_MAX_HOST_BRIDGE_NUM];\r
EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL  *gIncompatiblePciDeviceSupport = NULL;\r
UINTN                                         gPciHostBridgeNumber           = 0;\r
BOOLEAN                                       gFullEnumeration               = TRUE;\r
UINT64                                        gAllOne                        = 0xFFFFFFFFFFFFFFFFULL;\r
UINT64                                        gAllZero                       = 0;\r
\r
EFI_PCI_PLATFORM_PROTOCOL       *gPciPlatformProtocol;\r
EFI_PCI_OVERRIDE_PROTOCOL       *gPciOverrideProtocol;\r
EDKII_IOMMU_PROTOCOL            *mIoMmuProtocol;\r
EDKII_DEVICE_SECURITY_PROTOCOL  *mDeviceSecurityProtocol;\r
\r
GLOBAL_REMOVE_IF_UNREFERENCED EFI_PCI_HOTPLUG_REQUEST_PROTOCOL  mPciHotPlugRequest = {\r
  PciHotPlugRequestNotify\r
};\r
\r
/**\r
  The Entry Point for PCI Bus module. The user code starts with this function.\r
\r
  Installs driver module protocols and. Creates virtual device handles for ConIn,\r
  ConOut, and StdErr. Installs Simple Text In protocol, Simple Text In Ex protocol,\r
  Simple Pointer protocol, Absolute Pointer protocol on those virtual handlers.\r
  Installs Graphics Output protocol and/or UGA Draw protocol if needed.\r
\r
  @param[in] ImageHandle    The firmware allocated handle for the EFI image.\r
  @param[in] SystemTable    A pointer to the EFI System Table.\r
\r
  @retval EFI_SUCCESS       The entry point is executed successfully.\r
  @retval other             Some error occurred when executing this entry point.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
PciBusEntryPoint (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  EFI_STATUS  Status;\r
  EFI_HANDLE  Handle;\r
\r
  //\r
  // Initializes PCI devices pool\r
  //\r
  InitializePciDevicePool ();\r
\r
  //\r
  // Install driver model protocol(s).\r
  //\r
  Status = EfiLibInstallDriverBindingComponentName2 (\r
             ImageHandle,\r
             SystemTable,\r
             &gPciBusDriverBinding,\r
             ImageHandle,\r
             &gPciBusComponentName,\r
             &gPciBusComponentName2\r
             );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  if (FeaturePcdGet (PcdPciBusHotplugDeviceSupport)) {\r
    //\r
    // If Hot Plug is supported, install EFI PCI Hot Plug Request protocol.\r
    //\r
    Handle = NULL;\r
    Status = gBS->InstallProtocolInterface (\r
                    &Handle,\r
                    &gEfiPciHotPlugRequestProtocolGuid,\r
                    EFI_NATIVE_INTERFACE,\r
                    &mPciHotPlugRequest\r
                    );\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Test to see if this driver supports ControllerHandle. Any ControllerHandle\r
  than contains a gEfiPciRootBridgeIoProtocolGuid protocol can be supported.\r
\r
  @param  This                Protocol instance pointer.\r
  @param  Controller          Handle of device to test.\r
  @param  RemainingDevicePath Optional parameter use to pick a specific child\r
                              device to start.\r
\r
  @retval EFI_SUCCESS         This driver supports this device.\r
  @retval EFI_ALREADY_STARTED This driver is already running on this device.\r
  @retval other               This driver does not support this device.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
PciBusDriverBindingSupported (\r
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                   Controller,\r
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath\r
  )\r
{\r
  EFI_STATUS                       Status;\r
  EFI_DEVICE_PATH_PROTOCOL         *ParentDevicePath;\r
  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *PciRootBridgeIo;\r
  EFI_DEV_PATH_PTR                 Node;\r
\r
  //\r
  // Check RemainingDevicePath validation\r
  //\r
  if (RemainingDevicePath != NULL) {\r
    //\r
    // Check if RemainingDevicePath is the End of Device Path Node,\r
    // if yes, go on checking other conditions\r
    //\r
    if (!IsDevicePathEnd (RemainingDevicePath)) {\r
      //\r
      // If RemainingDevicePath isn't the End of Device Path Node,\r
      // check its validation\r
      //\r
      Node.DevPath = RemainingDevicePath;\r
      if ((Node.DevPath->Type != HARDWARE_DEVICE_PATH) ||\r
          (Node.DevPath->SubType != HW_PCI_DP) ||\r
          (DevicePathNodeLength (Node.DevPath) != sizeof (PCI_DEVICE_PATH)))\r
      {\r
        return EFI_UNSUPPORTED;\r
      }\r
    }\r
  }\r
\r
  //\r
  // Check if Pci Root Bridge IO protocol is installed by platform\r
  //\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiPciRootBridgeIoProtocolGuid,\r
                  (VOID **)&PciRootBridgeIo,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_BY_DRIVER\r
                  );\r
  if (Status == EFI_ALREADY_STARTED) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Close the I/O Abstraction(s) used to perform the supported test\r
  //\r
  gBS->CloseProtocol (\r
         Controller,\r
         &gEfiPciRootBridgeIoProtocolGuid,\r
         This->DriverBindingHandle,\r
         Controller\r
         );\r
\r
  //\r
  // Open the EFI Device Path protocol needed to perform the supported test\r
  //\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiDevicePathProtocolGuid,\r
                  (VOID **)&ParentDevicePath,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_BY_DRIVER\r
                  );\r
  if (Status == EFI_ALREADY_STARTED) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Close protocol, don't use device path protocol in the Support() function\r
  //\r
  gBS->CloseProtocol (\r
         Controller,\r
         &gEfiDevicePathProtocolGuid,\r
         This->DriverBindingHandle,\r
         Controller\r
         );\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Start this driver on ControllerHandle and enumerate Pci bus and start\r
  all device under PCI bus.\r
\r
  @param  This                 Protocol instance pointer.\r
  @param  Controller           Handle of device to bind driver to.\r
  @param  RemainingDevicePath  Optional parameter use to pick a specific child\r
                               device to start.\r
\r
  @retval EFI_SUCCESS          This driver is added to ControllerHandle.\r
  @retval EFI_ALREADY_STARTED  This driver is already running on ControllerHandle.\r
  @retval other                This driver does not support this device.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
PciBusDriverBindingStart (\r
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                   Controller,\r
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath\r
  )\r
{\r
  EFI_STATUS                       Status;\r
  EFI_DEVICE_PATH_PROTOCOL         *ParentDevicePath;\r
  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *PciRootBridgeIo;\r
\r
  //\r
  // Initialize PciRootBridgeIo to suppress incorrect compiler warning.\r
  //\r
  PciRootBridgeIo = NULL;\r
\r
  //\r
  // Check RemainingDevicePath validation\r
  //\r
  if (RemainingDevicePath != NULL) {\r
    //\r
    // Check if RemainingDevicePath is the End of Device Path Node,\r
    // if yes, return EFI_SUCCESS\r
    //\r
    if (IsDevicePathEnd (RemainingDevicePath)) {\r
      return EFI_SUCCESS;\r
    }\r
  }\r
\r
  gBS->LocateProtocol (\r
         &gEfiIncompatiblePciDeviceSupportProtocolGuid,\r
         NULL,\r
         (VOID **)&gIncompatiblePciDeviceSupport\r
         );\r
\r
  //\r
  // If PCI Platform protocol is available, get it now.\r
  // If the platform implements this, it must be installed before BDS phase\r
  //\r
  gPciPlatformProtocol = NULL;\r
  gBS->LocateProtocol (\r
         &gEfiPciPlatformProtocolGuid,\r
         NULL,\r
         (VOID **)&gPciPlatformProtocol\r
         );\r
\r
  //\r
  // If PCI Platform protocol doesn't exist, try to Pci Override Protocol.\r
  //\r
  if (gPciPlatformProtocol == NULL) {\r
    gPciOverrideProtocol = NULL;\r
    gBS->LocateProtocol (\r
           &gEfiPciOverrideProtocolGuid,\r
           NULL,\r
           (VOID **)&gPciOverrideProtocol\r
           );\r
  }\r
\r
  if (mIoMmuProtocol == NULL) {\r
    gBS->LocateProtocol (\r
           &gEdkiiIoMmuProtocolGuid,\r
           NULL,\r
           (VOID **)&mIoMmuProtocol\r
           );\r
  }\r
\r
  if (mDeviceSecurityProtocol == NULL) {\r
    gBS->LocateProtocol (\r
           &gEdkiiDeviceSecurityProtocolGuid,\r
           NULL,\r
           (VOID **)&mDeviceSecurityProtocol\r
           );\r
  }\r
\r
  if (PcdGetBool (PcdPciDisableBusEnumeration)) {\r
    gFullEnumeration = FALSE;\r
  } else {\r
    gFullEnumeration = (BOOLEAN)((SearchHostBridgeHandle (Controller) ? FALSE : TRUE));\r
  }\r
\r
  //\r
  // Open Device Path Protocol for PCI root bridge\r
  //\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiDevicePathProtocolGuid,\r
                  (VOID **)&ParentDevicePath,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  //\r
  // Report Status Code to indicate PCI bus starts\r
  //\r
  REPORT_STATUS_CODE_WITH_DEVICE_PATH (\r
    EFI_PROGRESS_CODE,\r
    (EFI_IO_BUS_PCI | EFI_IOB_PC_INIT),\r
    ParentDevicePath\r
    );\r
\r
  Status = EFI_SUCCESS;\r
  //\r
  // Enumerate the entire host bridge\r
  // After enumeration, a database that records all the device information will be created\r
  //\r
  //\r
  if (gFullEnumeration) {\r
    //\r
    // Get the rootbridge Io protocol to find the host bridge handle\r
    //\r
    Status = gBS->OpenProtocol (\r
                    Controller,\r
                    &gEfiPciRootBridgeIoProtocolGuid,\r
                    (VOID **)&PciRootBridgeIo,\r
                    gPciBusDriverBinding.DriverBindingHandle,\r
                    Controller,\r
                    EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
                    );\r
\r
    if (!EFI_ERROR (Status)) {\r
      Status = PciEnumerator (Controller, PciRootBridgeIo->ParentHandle);\r
    }\r
  } else {\r
    //\r
    // If PCI bus has already done the full enumeration, never do it again\r
    //\r
    Status = PciEnumeratorLight (Controller);\r
  }\r
\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Start all the devices under the entire host bridge.\r
  //\r
  StartPciDevices (Controller);\r
\r
  if (gFullEnumeration) {\r
    gFullEnumeration = FALSE;\r
\r
    Status = gBS->InstallProtocolInterface (\r
                    &PciRootBridgeIo->ParentHandle,\r
                    &gEfiPciEnumerationCompleteProtocolGuid,\r
                    EFI_NATIVE_INTERFACE,\r
                    NULL\r
                    );\r
    ASSERT_EFI_ERROR (Status);\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Stop this driver on ControllerHandle. Support stopping any child handles\r
  created by this driver.\r
\r
  @param  This              Protocol instance pointer.\r
  @param  Controller        Handle of device to stop driver on.\r
  @param  NumberOfChildren  Number of Handles in ChildHandleBuffer. If number of\r
                            children is zero stop the entire bus driver.\r
  @param  ChildHandleBuffer List of Child Handles to Stop.\r
\r
  @retval EFI_SUCCESS       This driver is removed ControllerHandle.\r
  @retval other             This driver was not removed from this device.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
PciBusDriverBindingStop (\r
  IN  EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN  EFI_HANDLE                   Controller,\r
  IN  UINTN                        NumberOfChildren,\r
  IN  EFI_HANDLE                   *ChildHandleBuffer\r
  )\r
{\r
  EFI_STATUS  Status;\r
  UINTN       Index;\r
  BOOLEAN     AllChildrenStopped;\r
\r
  if (NumberOfChildren == 0) {\r
    //\r
    // Close the bus driver\r
    //\r
    gBS->CloseProtocol (\r
           Controller,\r
           &gEfiDevicePathProtocolGuid,\r
           This->DriverBindingHandle,\r
           Controller\r
           );\r
    gBS->CloseProtocol (\r
           Controller,\r
           &gEfiPciRootBridgeIoProtocolGuid,\r
           This->DriverBindingHandle,\r
           Controller\r
           );\r
\r
    DestroyRootBridgeByHandle (\r
      Controller\r
      );\r
\r
    return EFI_SUCCESS;\r
  }\r
\r
  //\r
  // Stop all the children\r
  //\r
\r
  AllChildrenStopped = TRUE;\r
\r
  for (Index = 0; Index < NumberOfChildren; Index++) {\r
    //\r
    // De register all the pci device\r
    //\r
    Status = DeRegisterPciDevice (Controller, ChildHandleBuffer[Index]);\r
\r
    if (EFI_ERROR (Status)) {\r
      AllChildrenStopped = FALSE;\r
    }\r
  }\r
\r
  if (!AllChildrenStopped) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
Commit	Line	Data
	1	/** @file\r
	2	Driver Binding functions for PCI Bus module.\r
	3	\r
	4	Single PCI bus driver instance will manager all PCI Root Bridges in one EFI based firmware,\r
	5	since all PCI Root Bridges' resources need to be managed together.\r
	6	Supported() function will try to get PCI Root Bridge IO Protocol.\r
	7	Start() function will get PCI Host Bridge Resource Allocation Protocol to manage all\r
	8	PCI Root Bridges. So it means platform needs install PCI Root Bridge IO protocol for each\r
	9	PCI Root Bus and install PCI Host Bridge Resource Allocation Protocol.\r
	10	\r
	11	Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>\r
	12	SPDX-License-Identifier: BSD-2-Clause-Patent\r
	13	\r
	14	**/\r
	15	\r
	16	#include "PciBus.h"\r
	17	\r
	18	//\r
	19	// PCI Bus Driver Global Variables\r
	20	//\r
	21	EFI_DRIVER_BINDING_PROTOCOL gPciBusDriverBinding = {\r
	22	PciBusDriverBindingSupported,\r
	23	PciBusDriverBindingStart,\r
	24	PciBusDriverBindingStop,\r
	25	0xa,\r
	26	NULL,\r
	27	NULL\r
	28	};\r
	29	\r
	30	EFI_HANDLE gPciHostBrigeHandles[PCI_MAX_HOST_BRIDGE_NUM];\r
	31	EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL *gIncompatiblePciDeviceSupport = NULL;\r
	32	UINTN gPciHostBridgeNumber = 0;\r
	33	BOOLEAN gFullEnumeration = TRUE;\r
	34	UINT64 gAllOne = 0xFFFFFFFFFFFFFFFFULL;\r
	35	UINT64 gAllZero = 0;\r
	36	\r
	37	EFI_PCI_PLATFORM_PROTOCOL *gPciPlatformProtocol;\r
	38	EFI_PCI_OVERRIDE_PROTOCOL *gPciOverrideProtocol;\r
	39	EDKII_IOMMU_PROTOCOL *mIoMmuProtocol;\r
	40	EDKII_DEVICE_SECURITY_PROTOCOL *mDeviceSecurityProtocol;\r
	41	\r
	42	GLOBAL_REMOVE_IF_UNREFERENCED EFI_PCI_HOTPLUG_REQUEST_PROTOCOL mPciHotPlugRequest = {\r
	43	PciHotPlugRequestNotify\r
	44	};\r
	45	\r
	46	/**\r
	47	The Entry Point for PCI Bus module. The user code starts with this function.\r
	48	\r
	49	Installs driver module protocols and. Creates virtual device handles for ConIn,\r
	50	ConOut, and StdErr. Installs Simple Text In protocol, Simple Text In Ex protocol,\r
	51	Simple Pointer protocol, Absolute Pointer protocol on those virtual handlers.\r
	52	Installs Graphics Output protocol and/or UGA Draw protocol if needed.\r
	53	\r
	54	@param[in] ImageHandle The firmware allocated handle for the EFI image.\r
	55	@param[in] SystemTable A pointer to the EFI System Table.\r
	56	\r
	57	@retval EFI_SUCCESS The entry point is executed successfully.\r
	58	@retval other Some error occurred when executing this entry point.\r
	59	\r
	60	**/\r
	61	EFI_STATUS\r
	62	EFIAPI\r
	63	PciBusEntryPoint (\r
	64	IN EFI_HANDLE ImageHandle,\r
	65	IN EFI_SYSTEM_TABLE *SystemTable\r
	66	)\r
	67	{\r
	68	EFI_STATUS Status;\r
	69	EFI_HANDLE Handle;\r
	70	\r
	71	//\r
	72	// Initializes PCI devices pool\r
	73	//\r
	74	InitializePciDevicePool ();\r
	75	\r
	76	//\r
	77	// Install driver model protocol(s).\r
	78	//\r
	79	Status = EfiLibInstallDriverBindingComponentName2 (\r
	80	ImageHandle,\r
	81	SystemTable,\r
	82	&gPciBusDriverBinding,\r
	83	ImageHandle,\r
	84	&gPciBusComponentName,\r
	85	&gPciBusComponentName2\r
	86	);\r
	87	ASSERT_EFI_ERROR (Status);\r
	88	\r
	89	if (FeaturePcdGet (PcdPciBusHotplugDeviceSupport)) {\r
	90	//\r
	91	// If Hot Plug is supported, install EFI PCI Hot Plug Request protocol.\r
	92	//\r
	93	Handle = NULL;\r
	94	Status = gBS->InstallProtocolInterface (\r
	95	&Handle,\r
	96	&gEfiPciHotPlugRequestProtocolGuid,\r
	97	EFI_NATIVE_INTERFACE,\r
	98	&mPciHotPlugRequest\r
	99	);\r
	100	}\r
	101	\r
	102	return Status;\r
	103	}\r
	104	\r
	105	/**\r
	106	Test to see if this driver supports ControllerHandle. Any ControllerHandle\r
	107	than contains a gEfiPciRootBridgeIoProtocolGuid protocol can be supported.\r
	108	\r
	109	@param This Protocol instance pointer.\r
	110	@param Controller Handle of device to test.\r
	111	@param RemainingDevicePath Optional parameter use to pick a specific child\r
	112	device to start.\r
	113	\r
	114	@retval EFI_SUCCESS This driver supports this device.\r
	115	@retval EFI_ALREADY_STARTED This driver is already running on this device.\r
	116	@retval other This driver does not support this device.\r
	117	\r
	118	**/\r
	119	EFI_STATUS\r
	120	EFIAPI\r
	121	PciBusDriverBindingSupported (\r
	122	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
	123	IN EFI_HANDLE Controller,\r
	124	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r
	125	)\r
	126	{\r
	127	EFI_STATUS Status;\r
	128	EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;\r
	129	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;\r
	130	EFI_DEV_PATH_PTR Node;\r
	131	\r
	132	//\r
	133	// Check RemainingDevicePath validation\r
	134	//\r
	135	if (RemainingDevicePath != NULL) {\r
	136	//\r
	137	// Check if RemainingDevicePath is the End of Device Path Node,\r
	138	// if yes, go on checking other conditions\r
	139	//\r
	140	if (!IsDevicePathEnd (RemainingDevicePath)) {\r
	141	//\r
	142	// If RemainingDevicePath isn't the End of Device Path Node,\r
	143	// check its validation\r
	144	//\r
	145	Node.DevPath = RemainingDevicePath;\r
	146	if ((Node.DevPath->Type != HARDWARE_DEVICE_PATH) \|\|\r
	147	(Node.DevPath->SubType != HW_PCI_DP) \|\|\r
	148	(DevicePathNodeLength (Node.DevPath) != sizeof (PCI_DEVICE_PATH)))\r
	149	{\r
	150	return EFI_UNSUPPORTED;\r
	151	}\r
	152	}\r
	153	}\r
	154	\r
	155	//\r
	156	// Check if Pci Root Bridge IO protocol is installed by platform\r
	157	//\r
	158	Status = gBS->OpenProtocol (\r
	159	Controller,\r
	160	&gEfiPciRootBridgeIoProtocolGuid,\r
	161	(VOID **)&PciRootBridgeIo,\r
	162	This->DriverBindingHandle,\r
	163	Controller,\r
	164	EFI_OPEN_PROTOCOL_BY_DRIVER\r
	165	);\r
	166	if (Status == EFI_ALREADY_STARTED) {\r
	167	return EFI_SUCCESS;\r
	168	}\r
	169	\r
	170	if (EFI_ERROR (Status)) {\r
	171	return Status;\r
	172	}\r
	173	\r
	174	//\r
	175	// Close the I/O Abstraction(s) used to perform the supported test\r
	176	//\r
	177	gBS->CloseProtocol (\r
	178	Controller,\r
	179	&gEfiPciRootBridgeIoProtocolGuid,\r
	180	This->DriverBindingHandle,\r
	181	Controller\r
	182	);\r
	183	\r
	184	//\r
	185	// Open the EFI Device Path protocol needed to perform the supported test\r
	186	//\r
	187	Status = gBS->OpenProtocol (\r
	188	Controller,\r
	189	&gEfiDevicePathProtocolGuid,\r
	190	(VOID **)&ParentDevicePath,\r
	191	This->DriverBindingHandle,\r
	192	Controller,\r
	193	EFI_OPEN_PROTOCOL_BY_DRIVER\r
	194	);\r
	195	if (Status == EFI_ALREADY_STARTED) {\r
	196	return EFI_SUCCESS;\r
	197	}\r
	198	\r
	199	if (EFI_ERROR (Status)) {\r
	200	return Status;\r
	201	}\r
	202	\r
	203	//\r
	204	// Close protocol, don't use device path protocol in the Support() function\r
	205	//\r
	206	gBS->CloseProtocol (\r
	207	Controller,\r
	208	&gEfiDevicePathProtocolGuid,\r
	209	This->DriverBindingHandle,\r
	210	Controller\r
	211	);\r
	212	\r
	213	return EFI_SUCCESS;\r
	214	}\r
	215	\r
	216	/**\r
	217	Start this driver on ControllerHandle and enumerate Pci bus and start\r
	218	all device under PCI bus.\r
	219	\r
	220	@param This Protocol instance pointer.\r
	221	@param Controller Handle of device to bind driver to.\r
	222	@param RemainingDevicePath Optional parameter use to pick a specific child\r
	223	device to start.\r
	224	\r
	225	@retval EFI_SUCCESS This driver is added to ControllerHandle.\r
	226	@retval EFI_ALREADY_STARTED This driver is already running on ControllerHandle.\r
	227	@retval other This driver does not support this device.\r
	228	\r
	229	**/\r
	230	EFI_STATUS\r
	231	EFIAPI\r
	232	PciBusDriverBindingStart (\r
	233	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
	234	IN EFI_HANDLE Controller,\r
	235	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r
	236	)\r
	237	{\r
	238	EFI_STATUS Status;\r
	239	EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;\r
	240	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;\r
	241	\r
	242	//\r
	243	// Initialize PciRootBridgeIo to suppress incorrect compiler warning.\r
	244	//\r
	245	PciRootBridgeIo = NULL;\r
	246	\r
	247	//\r
	248	// Check RemainingDevicePath validation\r
	249	//\r
	250	if (RemainingDevicePath != NULL) {\r
	251	//\r
	252	// Check if RemainingDevicePath is the End of Device Path Node,\r
	253	// if yes, return EFI_SUCCESS\r
	254	//\r
	255	if (IsDevicePathEnd (RemainingDevicePath)) {\r
	256	return EFI_SUCCESS;\r
	257	}\r
	258	}\r
	259	\r
	260	gBS->LocateProtocol (\r
	261	&gEfiIncompatiblePciDeviceSupportProtocolGuid,\r
	262	NULL,\r
	263	(VOID **)&gIncompatiblePciDeviceSupport\r
	264	);\r
	265	\r
	266	//\r
	267	// If PCI Platform protocol is available, get it now.\r
	268	// If the platform implements this, it must be installed before BDS phase\r
	269	//\r
	270	gPciPlatformProtocol = NULL;\r
	271	gBS->LocateProtocol (\r
	272	&gEfiPciPlatformProtocolGuid,\r
	273	NULL,\r
	274	(VOID **)&gPciPlatformProtocol\r
	275	);\r
	276	\r
	277	//\r
	278	// If PCI Platform protocol doesn't exist, try to Pci Override Protocol.\r
	279	//\r
	280	if (gPciPlatformProtocol == NULL) {\r
	281	gPciOverrideProtocol = NULL;\r
	282	gBS->LocateProtocol (\r
	283	&gEfiPciOverrideProtocolGuid,\r
	284	NULL,\r
	285	(VOID **)&gPciOverrideProtocol\r
	286	);\r
	287	}\r
	288	\r
	289	if (mIoMmuProtocol == NULL) {\r
	290	gBS->LocateProtocol (\r
	291	&gEdkiiIoMmuProtocolGuid,\r
	292	NULL,\r
	293	(VOID **)&mIoMmuProtocol\r
	294	);\r
	295	}\r
	296	\r
	297	if (mDeviceSecurityProtocol == NULL) {\r
	298	gBS->LocateProtocol (\r
	299	&gEdkiiDeviceSecurityProtocolGuid,\r
	300	NULL,\r
	301	(VOID **)&mDeviceSecurityProtocol\r
	302	);\r
	303	}\r
	304	\r
	305	if (PcdGetBool (PcdPciDisableBusEnumeration)) {\r
	306	gFullEnumeration = FALSE;\r
	307	} else {\r
	308	gFullEnumeration = (BOOLEAN)((SearchHostBridgeHandle (Controller) ? FALSE : TRUE));\r
	309	}\r
	310	\r
	311	//\r
	312	// Open Device Path Protocol for PCI root bridge\r
	313	//\r
	314	Status = gBS->OpenProtocol (\r
	315	Controller,\r
	316	&gEfiDevicePathProtocolGuid,\r
	317	(VOID **)&ParentDevicePath,\r
	318	This->DriverBindingHandle,\r
	319	Controller,\r
	320	EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
	321	);\r
	322	ASSERT_EFI_ERROR (Status);\r
	323	\r
	324	//\r
	325	// Report Status Code to indicate PCI bus starts\r
	326	//\r
	327	REPORT_STATUS_CODE_WITH_DEVICE_PATH (\r
	328	EFI_PROGRESS_CODE,\r
	329	(EFI_IO_BUS_PCI \| EFI_IOB_PC_INIT),\r
	330	ParentDevicePath\r
	331	);\r
	332	\r
	333	Status = EFI_SUCCESS;\r
	334	//\r
	335	// Enumerate the entire host bridge\r
	336	// After enumeration, a database that records all the device information will be created\r
	337	//\r
	338	//\r
	339	if (gFullEnumeration) {\r
	340	//\r
	341	// Get the rootbridge Io protocol to find the host bridge handle\r
	342	//\r
	343	Status = gBS->OpenProtocol (\r
	344	Controller,\r
	345	&gEfiPciRootBridgeIoProtocolGuid,\r
	346	(VOID **)&PciRootBridgeIo,\r
	347	gPciBusDriverBinding.DriverBindingHandle,\r
	348	Controller,\r
	349	EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
	350	);\r
	351	\r
	352	if (!EFI_ERROR (Status)) {\r
	353	Status = PciEnumerator (Controller, PciRootBridgeIo->ParentHandle);\r
	354	}\r
	355	} else {\r
	356	//\r
	357	// If PCI bus has already done the full enumeration, never do it again\r
	358	//\r
	359	Status = PciEnumeratorLight (Controller);\r
	360	}\r
	361	\r
	362	if (EFI_ERROR (Status)) {\r
	363	return Status;\r
	364	}\r
	365	\r
	366	//\r
	367	// Start all the devices under the entire host bridge.\r
	368	//\r
	369	StartPciDevices (Controller);\r
	370	\r
	371	if (gFullEnumeration) {\r
	372	gFullEnumeration = FALSE;\r
	373	\r
	374	Status = gBS->InstallProtocolInterface (\r
	375	&PciRootBridgeIo->ParentHandle,\r
	376	&gEfiPciEnumerationCompleteProtocolGuid,\r
	377	EFI_NATIVE_INTERFACE,\r
	378	NULL\r
	379	);\r
	380	ASSERT_EFI_ERROR (Status);\r
	381	}\r
	382	\r
	383	return Status;\r
	384	}\r
	385	\r
	386	/**\r
	387	Stop this driver on ControllerHandle. Support stopping any child handles\r
	388	created by this driver.\r
	389	\r
	390	@param This Protocol instance pointer.\r
	391	@param Controller Handle of device to stop driver on.\r
	392	@param NumberOfChildren Number of Handles in ChildHandleBuffer. If number of\r
	393	children is zero stop the entire bus driver.\r
	394	@param ChildHandleBuffer List of Child Handles to Stop.\r
	395	\r
	396	@retval EFI_SUCCESS This driver is removed ControllerHandle.\r
	397	@retval other This driver was not removed from this device.\r
	398	\r
	399	**/\r
	400	EFI_STATUS\r
	401	EFIAPI\r
	402	PciBusDriverBindingStop (\r
	403	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
	404	IN EFI_HANDLE Controller,\r
	405	IN UINTN NumberOfChildren,\r
	406	IN EFI_HANDLE *ChildHandleBuffer\r
	407	)\r
	408	{\r
	409	EFI_STATUS Status;\r
	410	UINTN Index;\r
	411	BOOLEAN AllChildrenStopped;\r
	412	\r
	413	if (NumberOfChildren == 0) {\r
	414	//\r
	415	// Close the bus driver\r
	416	//\r
	417	gBS->CloseProtocol (\r
	418	Controller,\r
	419	&gEfiDevicePathProtocolGuid,\r
	420	This->DriverBindingHandle,\r
	421	Controller\r
	422	);\r
	423	gBS->CloseProtocol (\r
	424	Controller,\r
	425	&gEfiPciRootBridgeIoProtocolGuid,\r
	426	This->DriverBindingHandle,\r
	427	Controller\r
	428	);\r
	429	\r
	430	DestroyRootBridgeByHandle (\r
	431	Controller\r
	432	);\r
	433	\r
	434	return EFI_SUCCESS;\r
	435	}\r
	436	\r
	437	//\r
	438	// Stop all the children\r
	439	//\r
	440	\r
	441	AllChildrenStopped = TRUE;\r
	442	\r
	443	for (Index = 0; Index < NumberOfChildren; Index++) {\r
	444	//\r
	445	// De register all the pci device\r
	446	//\r
	447	Status = DeRegisterPciDevice (Controller, ChildHandleBuffer[Index]);\r
	448	\r
	449	if (EFI_ERROR (Status)) {\r
	450	AllChildrenStopped = FALSE;\r
	451	}\r
	452	}\r
	453	\r
	454	if (!AllChildrenStopped) {\r
	455	return EFI_DEVICE_ERROR;\r
	456	}\r
	457	\r
	458	return EFI_SUCCESS;\r
	459	}\r