[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 - 2018, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\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
\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
        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 (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
    //\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
\r
Commit	Line	Data
9060e3ec	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
26329817	11	Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
cd5ebaa0	12	This program and the accompanying materials\r
9060e3ec	13	are licensed and made available under the terms and conditions of the BSD License\r
	14	which accompanies this distribution. The full text of the license may be found at\r
	15	http://opensource.org/licenses/bsd-license.php\r
	16	\r
	17	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	18	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	19	\r
	20	**/\r
	21	\r
	22	#include "PciBus.h"\r
	23	\r
	24	//\r
	25	// PCI Bus Driver Global Variables\r
	26	//\r
	27	EFI_DRIVER_BINDING_PROTOCOL gPciBusDriverBinding = {\r
	28	PciBusDriverBindingSupported,\r
	29	PciBusDriverBindingStart,\r
	30	PciBusDriverBindingStop,\r
	31	0xa,\r
	32	NULL,\r
	33	NULL\r
	34	};\r
	35	\r
	36	EFI_HANDLE gPciHostBrigeHandles[PCI_MAX_HOST_BRIDGE_NUM];\r
ea669c1b	37	EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL *gIncompatiblePciDeviceSupport = NULL;\r
9060e3ec	38	UINTN gPciHostBridgeNumber = 0;\r
	39	BOOLEAN gFullEnumeration = TRUE;\r
	40	UINT64 gAllOne = 0xFFFFFFFFFFFFFFFFULL;\r
	41	UINT64 gAllZero = 0;\r
	42	\r
	43	EFI_PCI_PLATFORM_PROTOCOL *gPciPlatformProtocol;\r
	44	EFI_PCI_OVERRIDE_PROTOCOL *gPciOverrideProtocol;\r
11a6cc5b	45	EDKII_IOMMU_PROTOCOL *mIoMmuProtocol;\r
9060e3ec	46	\r
	47	\r
	48	GLOBAL_REMOVE_IF_UNREFERENCED EFI_PCI_HOTPLUG_REQUEST_PROTOCOL mPciHotPlugRequest = {\r
	49	PciHotPlugRequestNotify\r
	50	};\r
	51	\r
	52	/**\r
	53	The Entry Point for PCI Bus module. The user code starts with this function.\r
	54	\r
	55	Installs driver module protocols and. Creates virtual device handles for ConIn,\r
	56	ConOut, and StdErr. Installs Simple Text In protocol, Simple Text In Ex protocol,\r
	57	Simple Pointer protocol, Absolute Pointer protocol on those virtual handlers.\r
	58	Installs Graphics Output protocol and/or UGA Draw protocol if needed.\r
	59	\r
	60	@param[in] ImageHandle The firmware allocated handle for the EFI image.\r
	61	@param[in] SystemTable A pointer to the EFI System Table.\r
	62	\r
	63	@retval EFI_SUCCESS The entry point is executed successfully.\r
	64	@retval other Some error occurred when executing this entry point.\r
	65	\r
	66	**/\r
	67	EFI_STATUS\r
	68	EFIAPI\r
	69	PciBusEntryPoint (\r
	70	IN EFI_HANDLE ImageHandle,\r
	71	IN EFI_SYSTEM_TABLE *SystemTable\r
	72	)\r
	73	{\r
	74	EFI_STATUS Status;\r
	75	EFI_HANDLE Handle;\r
	76	\r
	77	//\r
	78	// Initializes PCI devices pool\r
	79	//\r
	80	InitializePciDevicePool ();\r
	81	\r
	82	//\r
	83	// Install driver model protocol(s).\r
	84	//\r
	85	Status = EfiLibInstallDriverBindingComponentName2 (\r
	86	ImageHandle,\r
	87	SystemTable,\r
	88	&gPciBusDriverBinding,\r
	89	ImageHandle,\r
	90	&gPciBusComponentName,\r
	91	&gPciBusComponentName2\r
	92	);\r
	93	ASSERT_EFI_ERROR (Status);\r
	94	\r
	95	if (FeaturePcdGet (PcdPciBusHotplugDeviceSupport)) {\r
	96	//\r
	97	// If Hot Plug is supported, install EFI PCI Hot Plug Request protocol.\r
	98	//\r
	99	Handle = NULL;\r
	100	Status = gBS->InstallProtocolInterface (\r
	101	&Handle,\r
	102	&gEfiPciHotPlugRequestProtocolGuid,\r
	103	EFI_NATIVE_INTERFACE,\r
	104	&mPciHotPlugRequest\r
	105	);\r
	106	}\r
	107	\r
	108	return Status;\r
	109	}\r
110	\r
111	/**\r
112	Test to see if this driver supports ControllerHandle. Any ControllerHandle\r
113	than contains a gEfiPciRootBridgeIoProtocolGuid protocol can be supported.\r
114	\r
115	@param This Protocol instance pointer.\r
116	@param Controller Handle of device to test.\r
ed356b9e	117	@param RemainingDevicePath Optional parameter use to pick a specific child\r
9060e3ec	118	device to start.\r
	119	\r
	120	@retval EFI_SUCCESS This driver supports this device.\r
	121	@retval EFI_ALREADY_STARTED This driver is already running on this device.\r
	122	@retval other This driver does not support this device.\r
	123	\r
	124	**/\r
	125	EFI_STATUS\r
	126	EFIAPI\r
	127	PciBusDriverBindingSupported (\r
	128	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
	129	IN EFI_HANDLE Controller,\r
	130	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r
	131	)\r
	132	{\r
	133	EFI_STATUS Status;\r
	134	EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;\r
	135	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;\r
	136	EFI_DEV_PATH_PTR Node;\r
	137	\r
	138	//\r
	139	// Check RemainingDevicePath validation\r
	140	//\r
	141	if (RemainingDevicePath != NULL) {\r
	142	//\r
d1102dba	143	// Check if RemainingDevicePath is the End of Device Path Node,\r
9060e3ec	144	// if yes, go on checking other conditions\r
	145	//\r
	146	if (!IsDevicePathEnd (RemainingDevicePath)) {\r
	147	//\r
	148	// If RemainingDevicePath isn't the End of Device Path Node,\r
	149	// check its validation\r
	150	//\r
	151	Node.DevPath = RemainingDevicePath;\r
	152	if (Node.DevPath->Type != HARDWARE_DEVICE_PATH \|\|\r
	153	Node.DevPath->SubType != HW_PCI_DP \|\|\r
	154	DevicePathNodeLength(Node.DevPath) != sizeof(PCI_DEVICE_PATH)) {\r
	155	return EFI_UNSUPPORTED;\r
	156	}\r
	157	}\r
	158	}\r
	159	\r
	160	//\r
	161	// Check if Pci Root Bridge IO protocol is installed by platform\r
	162	//\r
	163	Status = gBS->OpenProtocol (\r
	164	Controller,\r
	165	&gEfiPciRootBridgeIoProtocolGuid,\r
	166	(VOID **) &PciRootBridgeIo,\r
	167	This->DriverBindingHandle,\r
	168	Controller,\r
	169	EFI_OPEN_PROTOCOL_BY_DRIVER\r
	170	);\r
	171	if (Status == EFI_ALREADY_STARTED) {\r
	172	return EFI_SUCCESS;\r
	173	}\r
	174	\r
	175	if (EFI_ERROR (Status)) {\r
	176	return Status;\r
	177	}\r
	178	\r
	179	//\r
	180	// Close the I/O Abstraction(s) used to perform the supported test\r
	181	//\r
	182	gBS->CloseProtocol (\r
	183	Controller,\r
	184	&gEfiPciRootBridgeIoProtocolGuid,\r
	185	This->DriverBindingHandle,\r
	186	Controller\r
	187	);\r
	188	\r
	189	//\r
	190	// Open the EFI Device Path protocol needed to perform the supported test\r
	191	//\r
	192	Status = gBS->OpenProtocol (\r
	193	Controller,\r
	194	&gEfiDevicePathProtocolGuid,\r
	195	(VOID **) &ParentDevicePath,\r
	196	This->DriverBindingHandle,\r
	197	Controller,\r
	198	EFI_OPEN_PROTOCOL_BY_DRIVER\r
	199	);\r
	200	if (Status == EFI_ALREADY_STARTED) {\r
	201	return EFI_SUCCESS;\r
	202	}\r
	203	\r
	204	if (EFI_ERROR (Status)) {\r
	205	return Status;\r
	206	}\r
	207	\r
208	//\r
209	// Close protocol, don't use device path protocol in the Support() function\r
210	//\r
211	gBS->CloseProtocol (\r
212	Controller,\r
213	&gEfiDevicePathProtocolGuid,\r
214	This->DriverBindingHandle,\r
215	Controller\r
216	);\r
217	\r
218	return EFI_SUCCESS;\r
219	}\r
220	\r
221	/**\r
222	Start this driver on ControllerHandle and enumerate Pci bus and start\r
223	all device under PCI bus.\r
224	\r
225	@param This Protocol instance pointer.\r
226	@param Controller Handle of device to bind driver to.\r
ed356b9e	227	@param RemainingDevicePath Optional parameter use to pick a specific child\r
9060e3ec	228	device to start.\r
	229	\r
	230	@retval EFI_SUCCESS This driver is added to ControllerHandle.\r
	231	@retval EFI_ALREADY_STARTED This driver is already running on ControllerHandle.\r
	232	@retval other This driver does not support this device.\r
	233	\r
	234	**/\r
	235	EFI_STATUS\r
	236	EFIAPI\r
	237	PciBusDriverBindingStart (\r
	238	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
	239	IN EFI_HANDLE Controller,\r
	240	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath\r
	241	)\r
	242	{\r
26329817 RN	243	EFI_STATUS Status;\r
	244	EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;\r
	245	EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;\r
9060e3ec	246	\r
a012bf6e DB	247	//\r
	248	// Initialize PciRootBridgeIo to suppress incorrect compiler warning.\r
	249	//\r
	250	PciRootBridgeIo = NULL;\r
	251	\r
9060e3ec	252	//\r
	253	// Check RemainingDevicePath validation\r
	254	//\r
	255	if (RemainingDevicePath != NULL) {\r
	256	//\r
d1102dba	257	// Check if RemainingDevicePath is the End of Device Path Node,\r
9060e3ec	258	// if yes, return EFI_SUCCESS\r
	259	//\r
	260	if (IsDevicePathEnd (RemainingDevicePath)) {\r
	261	return EFI_SUCCESS;\r
	262	}\r
	263	}\r
	264	\r
500e2ac2 OM	265	gBS->LocateProtocol (\r
	266	&gEfiIncompatiblePciDeviceSupportProtocolGuid,\r
	267	NULL,\r
ea669c1b	268	(VOID **) &gIncompatiblePciDeviceSupport\r
500e2ac2	269	);\r
9060e3ec	270	\r
	271	//\r
	272	// If PCI Platform protocol is available, get it now.\r
	273	// If the platform implements this, it must be installed before BDS phase\r
	274	//\r
	275	gPciPlatformProtocol = NULL;\r
	276	gBS->LocateProtocol (\r
	277	&gEfiPciPlatformProtocolGuid,\r
	278	NULL,\r
	279	(VOID **) &gPciPlatformProtocol\r
	280	);\r
	281	\r
	282	//\r
	283	// If PCI Platform protocol doesn't exist, try to Pci Override Protocol.\r
	284	//\r
d1102dba	285	if (gPciPlatformProtocol == NULL) {\r
9060e3ec	286	gPciOverrideProtocol = NULL;\r
	287	gBS->LocateProtocol (\r
	288	&gEfiPciOverrideProtocolGuid,\r
	289	NULL,\r
	290	(VOID **) &gPciOverrideProtocol\r
	291	);\r
d1102dba	292	}\r
9060e3ec	293	\r
11a6cc5b JY	294	if (mIoMmuProtocol == NULL) {\r
	295	gBS->LocateProtocol (\r
	296	&gEdkiiIoMmuProtocolGuid,\r
	297	NULL,\r
	298	(VOID **) &mIoMmuProtocol\r
	299	);\r
	300	}\r
	301	\r
5624a27d WL	302	if (PcdGetBool (PcdPciDisableBusEnumeration)) {\r
	303	gFullEnumeration = FALSE;\r
	304	} else {\r
	305	gFullEnumeration = (BOOLEAN) ((SearchHostBridgeHandle (Controller) ? FALSE : TRUE));\r
	306	}\r
9060e3ec	307	\r
37623a5c	308	//\r
	309	// Open Device Path Protocol for PCI root bridge\r
	310	//\r
	311	Status = gBS->OpenProtocol (\r
	312	Controller,\r
	313	&gEfiDevicePathProtocolGuid,\r
	314	(VOID **) &ParentDevicePath,\r
	315	This->DriverBindingHandle,\r
	316	Controller,\r
	317	EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
d1102dba	318	);\r
37623a5c	319	ASSERT_EFI_ERROR (Status);\r
	320	\r
	321	//\r
	322	// Report Status Code to indicate PCI bus starts\r
	323	//\r
	324	REPORT_STATUS_CODE_WITH_DEVICE_PATH (\r
	325	EFI_PROGRESS_CODE,\r
	326	(EFI_IO_BUS_PCI \| EFI_IOB_PC_INIT),\r
	327	ParentDevicePath\r
	328	);\r
	329	\r
26329817	330	Status = EFI_SUCCESS;\r
9060e3ec	331	//\r
	332	// Enumerate the entire host bridge\r
	333	// After enumeration, a database that records all the device information will be created\r
	334	//\r
	335	//\r
26329817 RN	336	if (gFullEnumeration) {\r
	337	//\r
	338	// Get the rootbridge Io protocol to find the host bridge handle\r
	339	//\r
	340	Status = gBS->OpenProtocol (\r
	341	Controller,\r
	342	&gEfiPciRootBridgeIoProtocolGuid,\r
	343	(VOID **) &PciRootBridgeIo,\r
	344	gPciBusDriverBinding.DriverBindingHandle,\r
	345	Controller,\r
	346	EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
	347	);\r
	348	\r
	349	if (!EFI_ERROR (Status)) {\r
	350	Status = PciEnumerator (Controller, PciRootBridgeIo->ParentHandle);\r
	351	}\r
	352	} else {\r
	353	//\r
	354	// If PCI bus has already done the full enumeration, never do it again\r
	355	//\r
	356	Status = PciEnumeratorLight (Controller);\r
	357	}\r
9060e3ec	358	\r
	359	if (EFI_ERROR (Status)) {\r
	360	return Status;\r
	361	}\r
	362	\r
	363	//\r
	364	// Start all the devices under the entire host bridge.\r
	365	//\r
	366	StartPciDevices (Controller);\r
	367	\r
42e8bc7d RN	368	if (gFullEnumeration) {\r
	369	gFullEnumeration = FALSE;\r
	370	\r
	371	Status = gBS->InstallProtocolInterface (\r
	372	&PciRootBridgeIo->ParentHandle,\r
	373	&gEfiPciEnumerationCompleteProtocolGuid,\r
	374	EFI_NATIVE_INTERFACE,\r
	375	NULL\r
	376	);\r
	377	ASSERT_EFI_ERROR (Status);\r
	378	}\r
	379	\r
	380	return Status;\r
9060e3ec	381	}\r
	382	\r
	383	/**\r
ed356b9e	384	Stop this driver on ControllerHandle. Support stopping any child handles\r
9060e3ec	385	created by this driver.\r
	386	\r
	387	@param This Protocol instance pointer.\r
	388	@param Controller Handle of device to stop driver on.\r
	389	@param NumberOfChildren Number of Handles in ChildHandleBuffer. If number of\r
	390	children is zero stop the entire bus driver.\r
	391	@param ChildHandleBuffer List of Child Handles to Stop.\r
	392	\r
	393	@retval EFI_SUCCESS This driver is removed ControllerHandle.\r
	394	@retval other This driver was not removed from this device.\r
	395	\r
	396	**/\r
	397	EFI_STATUS\r
	398	EFIAPI\r
	399	PciBusDriverBindingStop (\r
	400	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
	401	IN EFI_HANDLE Controller,\r
	402	IN UINTN NumberOfChildren,\r
	403	IN EFI_HANDLE *ChildHandleBuffer\r
	404	)\r
	405	{\r
	406	EFI_STATUS Status;\r
	407	UINTN Index;\r
	408	BOOLEAN AllChildrenStopped;\r
	409	\r
	410	if (NumberOfChildren == 0) {\r
	411	//\r
	412	// Close the bus driver\r
	413	//\r
	414	gBS->CloseProtocol (\r
	415	Controller,\r
	416	&gEfiDevicePathProtocolGuid,\r
	417	This->DriverBindingHandle,\r
	418	Controller\r
	419	);\r
	420	gBS->CloseProtocol (\r
	421	Controller,\r
	422	&gEfiPciRootBridgeIoProtocolGuid,\r
	423	This->DriverBindingHandle,\r
	424	Controller\r
	425	);\r
	426	\r
	427	DestroyRootBridgeByHandle (\r
	428	Controller\r
	429	);\r
	430	\r
	431	return EFI_SUCCESS;\r
	432	}\r
	433	\r
	434	//\r
	435	// Stop all the children\r
	436	//\r
	437	\r
	438	AllChildrenStopped = TRUE;\r
	439	\r
	440	for (Index = 0; Index < NumberOfChildren; Index++) {\r
	441	\r
	442	//\r
	443	// De register all the pci device\r
	444	//\r
	445	Status = DeRegisterPciDevice (Controller, ChildHandleBuffer[Index]);\r
	446	\r
	447	if (EFI_ERROR (Status)) {\r
	448	AllChildrenStopped = FALSE;\r
449	}\r
450	}\r
451	\r
452	if (!AllChildrenStopped) {\r
453	return EFI_DEVICE_ERROR;\r
454	}\r
455	\r
456	return EFI_SUCCESS;\r
457	}\r
458	\r