[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
  // 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
  gFullEnumeration = FALSE;\r
  return EFI_SUCCESS;\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
	143	// Check if RemainingDevicePath is the End of Device Path Node, \r
	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
	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
500e2ac2 OM	260	gBS->LocateProtocol (\r
	261	&gEfiIncompatiblePciDeviceSupportProtocolGuid,\r
	262	NULL,\r
ea669c1b	263	(VOID **) &gIncompatiblePciDeviceSupport\r
500e2ac2	264	);\r
9060e3ec	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
11a6cc5b JY	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
5624a27d WL	297	if (PcdGetBool (PcdPciDisableBusEnumeration)) {\r
	298	gFullEnumeration = FALSE;\r
	299	} else {\r
	300	gFullEnumeration = (BOOLEAN) ((SearchHostBridgeHandle (Controller) ? FALSE : TRUE));\r
	301	}\r
9060e3ec	302	\r
37623a5c	303	//\r
	304	// Open Device Path Protocol for PCI root bridge\r
	305	//\r
	306	Status = gBS->OpenProtocol (\r
	307	Controller,\r
	308	&gEfiDevicePathProtocolGuid,\r
	309	(VOID **) &ParentDevicePath,\r
	310	This->DriverBindingHandle,\r
	311	Controller,\r
	312	EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
	313	); \r
	314	ASSERT_EFI_ERROR (Status);\r
	315	\r
	316	//\r
	317	// Report Status Code to indicate PCI bus starts\r
	318	//\r
	319	REPORT_STATUS_CODE_WITH_DEVICE_PATH (\r
	320	EFI_PROGRESS_CODE,\r
	321	(EFI_IO_BUS_PCI \| EFI_IOB_PC_INIT),\r
	322	ParentDevicePath\r
	323	);\r
	324	\r
26329817	325	Status = EFI_SUCCESS;\r
9060e3ec	326	//\r
	327	// Enumerate the entire host bridge\r
	328	// After enumeration, a database that records all the device information will be created\r
	329	//\r
	330	//\r
26329817 RN	331	if (gFullEnumeration) {\r
	332	//\r
	333	// Get the rootbridge Io protocol to find the host bridge handle\r
	334	//\r
	335	Status = gBS->OpenProtocol (\r
	336	Controller,\r
	337	&gEfiPciRootBridgeIoProtocolGuid,\r
	338	(VOID **) &PciRootBridgeIo,\r
	339	gPciBusDriverBinding.DriverBindingHandle,\r
	340	Controller,\r
	341	EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
	342	);\r
	343	\r
	344	if (!EFI_ERROR (Status)) {\r
	345	Status = PciEnumerator (Controller, PciRootBridgeIo->ParentHandle);\r
	346	}\r
	347	} else {\r
	348	//\r
	349	// If PCI bus has already done the full enumeration, never do it again\r
	350	//\r
	351	Status = PciEnumeratorLight (Controller);\r
	352	}\r
9060e3ec	353	\r
	354	if (EFI_ERROR (Status)) {\r
	355	return Status;\r
	356	}\r
	357	\r
	358	//\r
	359	// Start all the devices under the entire host bridge.\r
	360	//\r
	361	StartPciDevices (Controller);\r
	362	\r
26329817	363	gFullEnumeration = FALSE;\r
9060e3ec	364	return EFI_SUCCESS;\r
	365	}\r
	366	\r
	367	/**\r
ed356b9e	368	Stop this driver on ControllerHandle. Support stopping any child handles\r
9060e3ec	369	created by this driver.\r
	370	\r
	371	@param This Protocol instance pointer.\r
	372	@param Controller Handle of device to stop driver on.\r
	373	@param NumberOfChildren Number of Handles in ChildHandleBuffer. If number of\r
	374	children is zero stop the entire bus driver.\r
	375	@param ChildHandleBuffer List of Child Handles to Stop.\r
	376	\r
	377	@retval EFI_SUCCESS This driver is removed ControllerHandle.\r
	378	@retval other This driver was not removed from this device.\r
	379	\r
	380	**/\r
	381	EFI_STATUS\r
	382	EFIAPI\r
	383	PciBusDriverBindingStop (\r
	384	IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
	385	IN EFI_HANDLE Controller,\r
	386	IN UINTN NumberOfChildren,\r
	387	IN EFI_HANDLE *ChildHandleBuffer\r
	388	)\r
	389	{\r
	390	EFI_STATUS Status;\r
	391	UINTN Index;\r
	392	BOOLEAN AllChildrenStopped;\r
	393	\r
	394	if (NumberOfChildren == 0) {\r
	395	//\r
	396	// Close the bus driver\r
	397	//\r
	398	gBS->CloseProtocol (\r
	399	Controller,\r
	400	&gEfiDevicePathProtocolGuid,\r
	401	This->DriverBindingHandle,\r
	402	Controller\r
	403	);\r
	404	gBS->CloseProtocol (\r
	405	Controller,\r
	406	&gEfiPciRootBridgeIoProtocolGuid,\r
	407	This->DriverBindingHandle,\r
	408	Controller\r
	409	);\r
	410	\r
	411	DestroyRootBridgeByHandle (\r
	412	Controller\r
	413	);\r
	414	\r
	415	return EFI_SUCCESS;\r
	416	}\r
	417	\r
	418	//\r
	419	// Stop all the children\r
	420	//\r
	421	\r
	422	AllChildrenStopped = TRUE;\r
	423	\r
	424	for (Index = 0; Index < NumberOfChildren; Index++) {\r
	425	\r
	426	//\r
	427	// De register all the pci device\r
	428	//\r
	429	Status = DeRegisterPciDevice (Controller, ChildHandleBuffer[Index]);\r
	430	\r
	431	if (EFI_ERROR (Status)) {\r
	432	AllChildrenStopped = FALSE;\r
433	}\r
434	}\r
435	\r
436	if (!AllChildrenStopped) {\r
437	return EFI_DEVICE_ERROR;\r
438	}\r
439	\r
440	return EFI_SUCCESS;\r
441	}\r
442	\r