2 Driver Binding functions for PCI Bus module.
4 Single PCI bus driver instance will manager all PCI Root Bridges in one EFI based firmware,
5 since all PCI Root Bridges' resources need to be managed together.
6 Supported() function will try to get PCI Root Bridge IO Protocol.
7 Start() function will get PCI Host Bridge Resource Allocation Protocol to manage all
8 PCI Root Bridges. So it means platform needs install PCI Root Bridge IO protocol for each
9 PCI Root Bus and install PCI Host Bridge Resource Allocation Protocol.
11 Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
12 This program and the accompanying materials
13 are licensed and made available under the terms and conditions of the BSD License
14 which accompanies this distribution. The full text of the license may be found at
15 http://opensource.org/licenses/bsd-license.php
17 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
18 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
25 // PCI Bus Driver Global Variables
27 EFI_DRIVER_BINDING_PROTOCOL gPciBusDriverBinding
= {
28 PciBusDriverBindingSupported
,
29 PciBusDriverBindingStart
,
30 PciBusDriverBindingStop
,
36 EFI_HANDLE gPciHostBrigeHandles
[PCI_MAX_HOST_BRIDGE_NUM
];
37 EFI_INCOMPATIBLE_PCI_DEVICE_SUPPORT_PROTOCOL
*gIncompatiblePciDeviceSupport
= NULL
;
38 UINTN gPciHostBridgeNumber
= 0;
39 BOOLEAN gFullEnumeration
= TRUE
;
40 UINT64 gAllOne
= 0xFFFFFFFFFFFFFFFFULL
;
43 EFI_PCI_PLATFORM_PROTOCOL
*gPciPlatformProtocol
;
44 EFI_PCI_OVERRIDE_PROTOCOL
*gPciOverrideProtocol
;
45 EDKII_IOMMU_PROTOCOL
*mIoMmuProtocol
;
48 GLOBAL_REMOVE_IF_UNREFERENCED EFI_PCI_HOTPLUG_REQUEST_PROTOCOL mPciHotPlugRequest
= {
49 PciHotPlugRequestNotify
53 The Entry Point for PCI Bus module. The user code starts with this function.
55 Installs driver module protocols and. Creates virtual device handles for ConIn,
56 ConOut, and StdErr. Installs Simple Text In protocol, Simple Text In Ex protocol,
57 Simple Pointer protocol, Absolute Pointer protocol on those virtual handlers.
58 Installs Graphics Output protocol and/or UGA Draw protocol if needed.
60 @param[in] ImageHandle The firmware allocated handle for the EFI image.
61 @param[in] SystemTable A pointer to the EFI System Table.
63 @retval EFI_SUCCESS The entry point is executed successfully.
64 @retval other Some error occurred when executing this entry point.
70 IN EFI_HANDLE ImageHandle
,
71 IN EFI_SYSTEM_TABLE
*SystemTable
78 // Initializes PCI devices pool
80 InitializePciDevicePool ();
83 // Install driver model protocol(s).
85 Status
= EfiLibInstallDriverBindingComponentName2 (
88 &gPciBusDriverBinding
,
90 &gPciBusComponentName
,
91 &gPciBusComponentName2
93 ASSERT_EFI_ERROR (Status
);
95 if (FeaturePcdGet (PcdPciBusHotplugDeviceSupport
)) {
97 // If Hot Plug is supported, install EFI PCI Hot Plug Request protocol.
100 Status
= gBS
->InstallProtocolInterface (
102 &gEfiPciHotPlugRequestProtocolGuid
,
103 EFI_NATIVE_INTERFACE
,
112 Test to see if this driver supports ControllerHandle. Any ControllerHandle
113 than contains a gEfiPciRootBridgeIoProtocolGuid protocol can be supported.
115 @param This Protocol instance pointer.
116 @param Controller Handle of device to test.
117 @param RemainingDevicePath Optional parameter use to pick a specific child
120 @retval EFI_SUCCESS This driver supports this device.
121 @retval EFI_ALREADY_STARTED This driver is already running on this device.
122 @retval other This driver does not support this device.
127 PciBusDriverBindingSupported (
128 IN EFI_DRIVER_BINDING_PROTOCOL
*This
,
129 IN EFI_HANDLE Controller
,
130 IN EFI_DEVICE_PATH_PROTOCOL
*RemainingDevicePath
134 EFI_DEVICE_PATH_PROTOCOL
*ParentDevicePath
;
135 EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL
*PciRootBridgeIo
;
136 EFI_DEV_PATH_PTR Node
;
139 // Check RemainingDevicePath validation
141 if (RemainingDevicePath
!= NULL
) {
143 // Check if RemainingDevicePath is the End of Device Path Node,
144 // if yes, go on checking other conditions
146 if (!IsDevicePathEnd (RemainingDevicePath
)) {
148 // If RemainingDevicePath isn't the End of Device Path Node,
149 // check its validation
151 Node
.DevPath
= RemainingDevicePath
;
152 if (Node
.DevPath
->Type
!= HARDWARE_DEVICE_PATH
||
153 Node
.DevPath
->SubType
!= HW_PCI_DP
||
154 DevicePathNodeLength(Node
.DevPath
) != sizeof(PCI_DEVICE_PATH
)) {
155 return EFI_UNSUPPORTED
;
161 // Check if Pci Root Bridge IO protocol is installed by platform
163 Status
= gBS
->OpenProtocol (
165 &gEfiPciRootBridgeIoProtocolGuid
,
166 (VOID
**) &PciRootBridgeIo
,
167 This
->DriverBindingHandle
,
169 EFI_OPEN_PROTOCOL_BY_DRIVER
171 if (Status
== EFI_ALREADY_STARTED
) {
175 if (EFI_ERROR (Status
)) {
180 // Close the I/O Abstraction(s) used to perform the supported test
184 &gEfiPciRootBridgeIoProtocolGuid
,
185 This
->DriverBindingHandle
,
190 // Open the EFI Device Path protocol needed to perform the supported test
192 Status
= gBS
->OpenProtocol (
194 &gEfiDevicePathProtocolGuid
,
195 (VOID
**) &ParentDevicePath
,
196 This
->DriverBindingHandle
,
198 EFI_OPEN_PROTOCOL_BY_DRIVER
200 if (Status
== EFI_ALREADY_STARTED
) {
204 if (EFI_ERROR (Status
)) {
209 // Close protocol, don't use device path protocol in the Support() function
213 &gEfiDevicePathProtocolGuid
,
214 This
->DriverBindingHandle
,
222 Start this driver on ControllerHandle and enumerate Pci bus and start
223 all device under PCI bus.
225 @param This Protocol instance pointer.
226 @param Controller Handle of device to bind driver to.
227 @param RemainingDevicePath Optional parameter use to pick a specific child
230 @retval EFI_SUCCESS This driver is added to ControllerHandle.
231 @retval EFI_ALREADY_STARTED This driver is already running on ControllerHandle.
232 @retval other This driver does not support this device.
237 PciBusDriverBindingStart (
238 IN EFI_DRIVER_BINDING_PROTOCOL
*This
,
239 IN EFI_HANDLE Controller
,
240 IN EFI_DEVICE_PATH_PROTOCOL
*RemainingDevicePath
244 EFI_DEVICE_PATH_PROTOCOL
*ParentDevicePath
;
247 // Check RemainingDevicePath validation
249 if (RemainingDevicePath
!= NULL
) {
251 // Check if RemainingDevicePath is the End of Device Path Node,
252 // if yes, return EFI_SUCCESS
254 if (IsDevicePathEnd (RemainingDevicePath
)) {
259 gBS
->LocateProtocol (
260 &gEfiIncompatiblePciDeviceSupportProtocolGuid
,
262 (VOID
**) &gIncompatiblePciDeviceSupport
266 // If PCI Platform protocol is available, get it now.
267 // If the platform implements this, it must be installed before BDS phase
269 gPciPlatformProtocol
= NULL
;
270 gBS
->LocateProtocol (
271 &gEfiPciPlatformProtocolGuid
,
273 (VOID
**) &gPciPlatformProtocol
277 // If PCI Platform protocol doesn't exist, try to Pci Override Protocol.
279 if (gPciPlatformProtocol
== NULL
) {
280 gPciOverrideProtocol
= NULL
;
281 gBS
->LocateProtocol (
282 &gEfiPciOverrideProtocolGuid
,
284 (VOID
**) &gPciOverrideProtocol
288 if (mIoMmuProtocol
== NULL
) {
289 gBS
->LocateProtocol (
290 &gEdkiiIoMmuProtocolGuid
,
292 (VOID
**) &mIoMmuProtocol
296 if (PcdGetBool (PcdPciDisableBusEnumeration
)) {
297 gFullEnumeration
= FALSE
;
299 gFullEnumeration
= (BOOLEAN
) ((SearchHostBridgeHandle (Controller
) ? FALSE
: TRUE
));
303 // Open Device Path Protocol for PCI root bridge
305 Status
= gBS
->OpenProtocol (
307 &gEfiDevicePathProtocolGuid
,
308 (VOID
**) &ParentDevicePath
,
309 This
->DriverBindingHandle
,
311 EFI_OPEN_PROTOCOL_GET_PROTOCOL
313 ASSERT_EFI_ERROR (Status
);
316 // Report Status Code to indicate PCI bus starts
318 REPORT_STATUS_CODE_WITH_DEVICE_PATH (
320 (EFI_IO_BUS_PCI
| EFI_IOB_PC_INIT
),
325 // Enumerate the entire host bridge
326 // After enumeration, a database that records all the device information will be created
329 Status
= PciEnumerator (Controller
);
331 if (EFI_ERROR (Status
)) {
336 // Start all the devices under the entire host bridge.
338 StartPciDevices (Controller
);
344 Stop this driver on ControllerHandle. Support stopping any child handles
345 created by this driver.
347 @param This Protocol instance pointer.
348 @param Controller Handle of device to stop driver on.
349 @param NumberOfChildren Number of Handles in ChildHandleBuffer. If number of
350 children is zero stop the entire bus driver.
351 @param ChildHandleBuffer List of Child Handles to Stop.
353 @retval EFI_SUCCESS This driver is removed ControllerHandle.
354 @retval other This driver was not removed from this device.
359 PciBusDriverBindingStop (
360 IN EFI_DRIVER_BINDING_PROTOCOL
*This
,
361 IN EFI_HANDLE Controller
,
362 IN UINTN NumberOfChildren
,
363 IN EFI_HANDLE
*ChildHandleBuffer
368 BOOLEAN AllChildrenStopped
;
370 if (NumberOfChildren
== 0) {
372 // Close the bus driver
376 &gEfiDevicePathProtocolGuid
,
377 This
->DriverBindingHandle
,
382 &gEfiPciRootBridgeIoProtocolGuid
,
383 This
->DriverBindingHandle
,
387 DestroyRootBridgeByHandle (
395 // Stop all the children
398 AllChildrenStopped
= TRUE
;
400 for (Index
= 0; Index
< NumberOfChildren
; Index
++) {
403 // De register all the pci device
405 Status
= DeRegisterPciDevice (Controller
, ChildHandleBuffer
[Index
]);
407 if (EFI_ERROR (Status
)) {
408 AllChildrenStopped
= FALSE
;
412 if (!AllChildrenStopped
) {
413 return EFI_DEVICE_ERROR
;