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

/** @file\r
  PCI Hot Plug support functions implementation for PCI Bus module..\r
\r
Copyright (c) 2006 - 2009, Intel Corporation\r
All rights reserved. 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
EFI_PCI_HOT_PLUG_INIT_PROTOCOL  *gPciHotPlugInit = NULL;\r
EFI_HPC_LOCATION                *gPciRootHpcPool = NULL;\r
UINTN                           gPciRootHpcCount = 0;\r
ROOT_HPC_DATA                   *gPciRootHpcData = NULL;\r
\r
\r
/**\r
  Event notification function to set Hot Plug controller status.\r
\r
  @param  Event                    The event that invoke this function.\r
  @param  Context                  The calling context, pointer to ROOT_HPC_DATA.\r
\r
**/\r
VOID\r
EFIAPI\r
PciHPCInitialized (\r
  IN EFI_EVENT    Event,\r
  IN VOID         *Context\r
  )\r
{\r
  ROOT_HPC_DATA   *HpcData;\r
\r
  HpcData               = (ROOT_HPC_DATA *) Context;\r
  HpcData->Initialized  = TRUE;\r
}\r
\r
/**\r
  Compare two device pathes to check if they are exactly same.\r
\r
  @param DevicePath1    A pointer to the first device path data structure.\r
  @param DevicePath2    A pointer to the second device path data structure.\r
\r
  @retval TRUE    They are same.\r
  @retval FALSE   They are not same.\r
\r
**/\r
BOOLEAN\r
EfiCompareDevicePath (\r
  IN EFI_DEVICE_PATH_PROTOCOL *DevicePath1,\r
  IN EFI_DEVICE_PATH_PROTOCOL *DevicePath2\r
  )\r
{\r
  UINTN Size1;\r
  UINTN Size2;\r
\r
  Size1 = GetDevicePathSize (DevicePath1);\r
  Size2 = GetDevicePathSize (DevicePath2);\r
\r
  if (Size1 != Size2) {\r
    return FALSE;\r
  }\r
\r
  if (CompareMem (DevicePath1, DevicePath2, Size1) != 0) {\r
    return FALSE;\r
  }\r
\r
  return TRUE;\r
}\r
\r
/**\r
  Check hot plug support and initialize root hot plug private data.\r
\r
  If Hot Plug is supported by the platform, call PCI Hot Plug Init protocol\r
  to get PCI Hot Plug controller's information and constructor the root hot plug\r
  private data structure.\r
\r
  @retval EFI_SUCCESS           They are same.\r
  @retval EFI_UNSUPPORTED       No PCI Hot Plug controler on the platform.\r
  @retval EFI_OUT_OF_RESOURCES  No memory to constructor root hot plug private\r
                                data structure.\r
\r
**/\r
EFI_STATUS\r
InitializeHotPlugSupport (\r
  VOID\r
  )\r
{\r
  EFI_STATUS        Status;\r
  EFI_HPC_LOCATION  *HpcList;\r
  UINTN             HpcCount;\r
\r
  //\r
  // Locate the PciHotPlugInit Protocol\r
  // If it doesn't exist, that means there is no\r
  // hot plug controller supported on the platform\r
  // the PCI Bus driver is running on. HotPlug Support\r
  // is an optional feature, so absence of the protocol\r
  // won't incur the penalty.\r
  //\r
  Status = gBS->LocateProtocol (\r
                  &gEfiPciHotPlugInitProtocolGuid,\r
                  NULL,\r
                  (VOID **) &gPciHotPlugInit\r
                  );\r
\r
  if (EFI_ERROR (Status)) {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  Status = gPciHotPlugInit->GetRootHpcList (\r
                              gPciHotPlugInit,\r
                              &HpcCount,\r
                              &HpcList\r
                              );\r
\r
  if (!EFI_ERROR (Status)) {\r
\r
    gPciRootHpcPool   = HpcList;\r
    gPciRootHpcCount  = HpcCount;\r
    gPciRootHpcData   = AllocateZeroPool (sizeof (ROOT_HPC_DATA) * gPciRootHpcCount);\r
    if (gPciRootHpcData == NULL) {\r
      return EFI_OUT_OF_RESOURCES;\r
    }\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Test whether device path is for root pci hot plug bus.\r
\r
  @param HpbDevicePath  A pointer to device path data structure to be tested.\r
  @param HpIndex        If HpIndex is not NULL, return the index of root hot\r
                        plug in global array when TRUE is retuned.\r
\r
  @retval TRUE          The device path is for root pci hot plug bus.\r
  @retval FALSE         The device path is not for root pci hot plug bus.\r
\r
**/\r
BOOLEAN\r
IsRootPciHotPlugBus (\r
  IN  EFI_DEVICE_PATH_PROTOCOL        *HpbDevicePath,\r
  OUT UINTN                           *HpIndex    OPTIONAL\r
  )\r
{\r
  UINTN Index;\r
\r
  for (Index = 0; Index < gPciRootHpcCount; Index++) {\r
\r
    if (EfiCompareDevicePath (gPciRootHpcPool[Index].HpbDevicePath, HpbDevicePath)) {\r
\r
      if (HpIndex != NULL) {\r
        *HpIndex = Index;\r
      }\r
\r
      return TRUE;\r
    }\r
  }\r
\r
  return FALSE;\r
}\r
\r
/**\r
  Test whether device path is for root pci hot plug controller.\r
\r
  @param HpcDevicePath  A pointer to device path data structure to be tested.\r
  @param HpIndex        If HpIndex is not NULL, return the index of root hot\r
                        plug in global array when TRUE is retuned.\r
\r
  @retval TRUE          The device path is for root pci hot plug controller.\r
  @retval FALSE         The device path is not for root pci hot plug controller.\r
\r
**/\r
BOOLEAN\r
IsRootPciHotPlugController (\r
  IN EFI_DEVICE_PATH_PROTOCOL         *HpcDevicePath,\r
  OUT UINTN                           *HpIndex\r
  )\r
{\r
  UINTN Index;\r
\r
  for (Index = 0; Index < gPciRootHpcCount; Index++) {\r
\r
    if (EfiCompareDevicePath (gPciRootHpcPool[Index].HpcDevicePath, HpcDevicePath)) {\r
\r
      if (HpIndex != NULL) {\r
        *HpIndex = Index;\r
      }\r
\r
      return TRUE;\r
    }\r
  }\r
\r
  return FALSE;\r
}\r
\r
/**\r
  Creating event object for PCI Hot Plug controller.\r
\r
  @param  HpIndex   Index of hot plug device in global array.\r
  @param  Event     The retuned event that invoke this function.\r
\r
  @return Status of create event invoken.\r
\r
**/\r
EFI_STATUS\r
CreateEventForHpc (\r
  IN  UINTN      HpIndex,\r
  OUT EFI_EVENT  *Event\r
  )\r
{\r
  EFI_STATUS  Status;\r
\r
  Status = gBS->CreateEvent (\r
                  EVT_NOTIFY_SIGNAL,\r
                  TPL_CALLBACK,\r
                  PciHPCInitialized,\r
                  gPciRootHpcData + HpIndex,\r
                  &((gPciRootHpcData + HpIndex)->Event)\r
                  );\r
\r
  if (!EFI_ERROR (Status)) {\r
    *Event = (gPciRootHpcData + HpIndex)->Event;\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Wait for all root PCI Hot Plug controller finished initializing.\r
\r
  @param TimeoutInMicroSeconds  Microseconds to wait for all root HPCs' initialization.\r
\r
  @retval EFI_SUCCESS           All HPCs initialization finished.\r
  @retval EFI_TIMEOUT           Not ALL HPCs initialization finished in Microseconds.\r
\r
**/\r
EFI_STATUS\r
AllRootHPCInitialized (\r
  IN  UINTN           TimeoutInMicroSeconds\r
  )\r
{\r
  UINT32  Delay;\r
  UINTN   Index;\r
\r
  Delay = (UINT32) ((TimeoutInMicroSeconds / 30) + 1);\r
\r
  do {\r
    for (Index = 0; Index < gPciRootHpcCount; Index++) {\r
\r
      if (!gPciRootHpcData[Index].Initialized) {\r
        break;\r
      }\r
    }\r
\r
    if (Index == gPciRootHpcCount) {\r
      return EFI_SUCCESS;\r
    }\r
\r
    //\r
    // Stall for 30 microseconds..\r
    //\r
    gBS->Stall (30);\r
\r
    Delay--;\r
\r
  } while (Delay > 0);\r
\r
  return EFI_TIMEOUT;\r
}\r
\r
/**\r
  Check whether PCI-PCI bridge has PCI Hot Plug capability register block.\r
\r
  @param PciIoDevice    A Pointer to the PCI-PCI bridge.\r
\r
  @retval TRUE    PCI device is HPC.\r
  @retval FALSE   PCI device is not HPC.\r
\r
**/\r
BOOLEAN\r
IsSHPC (\r
  IN PCI_IO_DEVICE                      *PciIoDevice\r
  )\r
{\r
\r
  EFI_STATUS  Status;\r
  UINT8       Offset;\r
\r
  if (PciIoDevice == NULL) {\r
    return FALSE;\r
  }\r
\r
  Offset = 0;\r
  Status = LocateCapabilityRegBlock (\r
            PciIoDevice,\r
            EFI_PCI_CAPABILITY_ID_HOTPLUG,\r
            &Offset,\r
            NULL\r
            );\r
\r
  //\r
  // If the PCI-PCI bridge has the hot plug controller build-in,\r
  // then return TRUE;\r
  //\r
  if (!EFI_ERROR (Status)) {\r
    return TRUE;\r
  }\r
\r
  return FALSE;\r
}\r
\r
/**\r
  Get resource padding if the specified PCI bridge is a hot plug bus.\r
\r
  @param PciIoDevice    PCI bridge instance.\r
\r
**/\r
VOID\r
GetResourcePaddingForHpb (\r
  IN PCI_IO_DEVICE      *PciIoDevice\r
  )\r
{\r
  EFI_STATUS                        Status;\r
  EFI_HPC_STATE                     State;\r
  UINT64                            PciAddress;\r
  EFI_HPC_PADDING_ATTRIBUTES        Attributes;\r
  EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptors;\r
\r
  if (IsPciHotPlugBus (PciIoDevice)) {\r
    //\r
    // If PCI-PCI bridge device is PCI Hot Plug bus.\r
    //\r
    PciAddress = EFI_PCI_ADDRESS (PciIoDevice->BusNumber, PciIoDevice->DeviceNumber, PciIoDevice->FunctionNumber, 0);\r
    Status = gPciHotPlugInit->GetResourcePadding (\r
                                gPciHotPlugInit,\r
                                PciIoDevice->DevicePath,\r
                                PciAddress,\r
                                &State,\r
                                (VOID **) &Descriptors,\r
                                &Attributes\r
                                );\r
\r
    if (EFI_ERROR (Status)) {\r
      return;\r
    }\r
\r
    if ((State & EFI_HPC_STATE_ENABLED) != 0 && (State & EFI_HPC_STATE_INITIALIZED) != 0) {\r
      PciIoDevice->ResourcePaddingDescriptors = Descriptors;\r
      PciIoDevice->PaddingAttributes          = Attributes;\r
    }\r
\r
    return;\r
  }\r
}\r
\r
/**\r
  Test whether PCI device is hot plug bus.\r
\r
  @param PciIoDevice  PCI device instance.\r
\r
  @retval TRUE    PCI device is a hot plug bus.\r
  @retval FALSE   PCI device is not a hot plug bus.\r
\r
**/\r
BOOLEAN\r
IsPciHotPlugBus (\r
  PCI_IO_DEVICE                       *PciIoDevice\r
  )\r
{\r
  if (IsSHPC (PciIoDevice)) {\r
    //\r
    // If the PPB has the hot plug controller build-in,\r
    // then return TRUE;\r
    //\r
    return TRUE;\r
  }\r
\r
  //\r
  // Otherwise, see if it is a Root HPC\r
  //\r
  if(IsRootPciHotPlugBus (PciIoDevice->DevicePath, NULL)) {\r
    return TRUE;\r
  }\r
\r
  return FALSE;\r
}\r
\r
Commit	Line	Data
9060e3ec	1	/** @file\r
	2	PCI Hot Plug support functions implementation for PCI Bus module..\r
	3	\r
	4	Copyright (c) 2006 - 2009, Intel Corporation\r
	5	All rights reserved. This program and the accompanying materials\r
	6	are licensed and made available under the terms and conditions of the BSD License\r
	7	which accompanies this distribution. The full text of the license may be found at\r
	8	http://opensource.org/licenses/bsd-license.php\r
	9	\r
	10	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	12	\r
	13	**/\r
	14	\r
	15	#include "PciBus.h"\r
	16	\r
	17	EFI_PCI_HOT_PLUG_INIT_PROTOCOL *gPciHotPlugInit = NULL;\r
	18	EFI_HPC_LOCATION *gPciRootHpcPool = NULL;\r
	19	UINTN gPciRootHpcCount = 0;\r
	20	ROOT_HPC_DATA *gPciRootHpcData = NULL;\r
	21	\r
	22	\r
	23	/**\r
	24	Event notification function to set Hot Plug controller status.\r
	25	\r
	26	@param Event The event that invoke this function.\r
	27	@param Context The calling context, pointer to ROOT_HPC_DATA.\r
	28	\r
	29	**/\r
	30	VOID\r
	31	EFIAPI\r
	32	PciHPCInitialized (\r
	33	IN EFI_EVENT Event,\r
	34	IN VOID *Context\r
	35	)\r
	36	{\r
	37	ROOT_HPC_DATA *HpcData;\r
	38	\r
	39	HpcData = (ROOT_HPC_DATA *) Context;\r
	40	HpcData->Initialized = TRUE;\r
	41	}\r
	42	\r
	43	/**\r
	44	Compare two device pathes to check if they are exactly same.\r
	45	\r
	46	@param DevicePath1 A pointer to the first device path data structure.\r
	47	@param DevicePath2 A pointer to the second device path data structure.\r
	48	\r
	49	@retval TRUE They are same.\r
	50	@retval FALSE They are not same.\r
	51	\r
	52	**/\r
	53	BOOLEAN\r
	54	EfiCompareDevicePath (\r
	55	IN EFI_DEVICE_PATH_PROTOCOL *DevicePath1,\r
	56	IN EFI_DEVICE_PATH_PROTOCOL *DevicePath2\r
	57	)\r
	58	{\r
	59	UINTN Size1;\r
	60	UINTN Size2;\r
	61	\r
	62	Size1 = GetDevicePathSize (DevicePath1);\r
	63	Size2 = GetDevicePathSize (DevicePath2);\r
	64	\r
65	if (Size1 != Size2) {\r
66	return FALSE;\r
67	}\r
68	\r
69	if (CompareMem (DevicePath1, DevicePath2, Size1) != 0) {\r
70	return FALSE;\r
71	}\r
72	\r
73	return TRUE;\r
74	}\r
75	\r
76	/**\r
77	Check hot plug support and initialize root hot plug private data.\r
78	\r
79	If Hot Plug is supported by the platform, call PCI Hot Plug Init protocol\r
80	to get PCI Hot Plug controller's information and constructor the root hot plug\r
81	private data structure.\r
82	\r
83	@retval EFI_SUCCESS They are same.\r
84	@retval EFI_UNSUPPORTED No PCI Hot Plug controler on the platform.\r
85	@retval EFI_OUT_OF_RESOURCES No memory to constructor root hot plug private\r
86	data structure.\r
87	\r
88	**/\r
89	EFI_STATUS\r
90	InitializeHotPlugSupport (\r
91	VOID\r
92	)\r
93	{\r
94	EFI_STATUS Status;\r
95	EFI_HPC_LOCATION *HpcList;\r
96	UINTN HpcCount;\r
97	\r
98	//\r
99	// Locate the PciHotPlugInit Protocol\r
100	// If it doesn't exist, that means there is no\r
101	// hot plug controller supported on the platform\r
102	// the PCI Bus driver is running on. HotPlug Support\r
103	// is an optional feature, so absence of the protocol\r
104	// won't incur the penalty.\r
105	//\r
106	Status = gBS->LocateProtocol (\r
107	&gEfiPciHotPlugInitProtocolGuid,\r
108	NULL,\r
109	(VOID **) &gPciHotPlugInit\r
110	);\r
111	\r
112	if (EFI_ERROR (Status)) {\r
113	return EFI_UNSUPPORTED;\r
114	}\r
115	\r
116	Status = gPciHotPlugInit->GetRootHpcList (\r
117	gPciHotPlugInit,\r
118	&HpcCount,\r
119	&HpcList\r
120	);\r
121	\r
122	if (!EFI_ERROR (Status)) {\r
123	\r
124	gPciRootHpcPool = HpcList;\r
125	gPciRootHpcCount = HpcCount;\r
126	gPciRootHpcData = AllocateZeroPool (sizeof (ROOT_HPC_DATA) * gPciRootHpcCount);\r
127	if (gPciRootHpcData == NULL) {\r
128	return EFI_OUT_OF_RESOURCES;\r
129	}\r
130	}\r
131	\r
132	return EFI_SUCCESS;\r
133	}\r
134	\r
135	/**\r
136	Test whether device path is for root pci hot plug bus.\r
137	\r
138	@param HpbDevicePath A pointer to device path data structure to be tested.\r
139	@param HpIndex If HpIndex is not NULL, return the index of root hot\r
140	plug in global array when TRUE is retuned.\r
141	\r
142	@retval TRUE The device path is for root pci hot plug bus.\r
143	@retval FALSE The device path is not for root pci hot plug bus.\r
144	\r
145	**/\r
146	BOOLEAN\r
147	IsRootPciHotPlugBus (\r
148	IN EFI_DEVICE_PATH_PROTOCOL *HpbDevicePath,\r
149	OUT UINTN *HpIndex OPTIONAL\r
150	)\r
151	{\r
152	UINTN Index;\r
153	\r
154	for (Index = 0; Index < gPciRootHpcCount; Index++) {\r
155	\r
156	if (EfiCompareDevicePath (gPciRootHpcPool[Index].HpbDevicePath, HpbDevicePath)) {\r
157	\r
158	if (HpIndex != NULL) {\r
159	*HpIndex = Index;\r
160	}\r
161	\r
162	return TRUE;\r
163	}\r
164	}\r
165	\r
166	return FALSE;\r
167	}\r
168	\r
169	/**\r
170	Test whether device path is for root pci hot plug controller.\r
171	\r
172	@param HpcDevicePath A pointer to device path data structure to be tested.\r
173	@param HpIndex If HpIndex is not NULL, return the index of root hot\r
174	plug in global array when TRUE is retuned.\r
175	\r
176	@retval TRUE The device path is for root pci hot plug controller.\r
177	@retval FALSE The device path is not for root pci hot plug controller.\r
178	\r
179	**/\r
180	BOOLEAN\r
181	IsRootPciHotPlugController (\r
182	IN EFI_DEVICE_PATH_PROTOCOL *HpcDevicePath,\r
183	OUT UINTN *HpIndex\r
184	)\r
185	{\r
186	UINTN Index;\r
187	\r
188	for (Index = 0; Index < gPciRootHpcCount; Index++) {\r
189	\r
190	if (EfiCompareDevicePath (gPciRootHpcPool[Index].HpcDevicePath, HpcDevicePath)) {\r
191	\r
192	if (HpIndex != NULL) {\r
193	*HpIndex = Index;\r
194	}\r
195	\r
196	return TRUE;\r
197	}\r
198	}\r
199	\r
200	return FALSE;\r
201	}\r
202	\r
203	/**\r
204	Creating event object for PCI Hot Plug controller.\r
205	\r
206	@param HpIndex Index of hot plug device in global array.\r
207	@param Event The retuned event that invoke this function.\r
208	\r
209	@return Status of create event invoken.\r
210	\r
211	**/\r
212	EFI_STATUS\r
213	CreateEventForHpc (\r
214	IN UINTN HpIndex,\r
215	OUT EFI_EVENT *Event\r
216	)\r
217	{\r
218	EFI_STATUS Status;\r
219	\r
220	Status = gBS->CreateEvent (\r
221	EVT_NOTIFY_SIGNAL,\r
222	TPL_CALLBACK,\r
223	PciHPCInitialized,\r
224	gPciRootHpcData + HpIndex,\r
225	&((gPciRootHpcData + HpIndex)->Event)\r
226	);\r
227	\r
228	if (!EFI_ERROR (Status)) {\r
229	*Event = (gPciRootHpcData + HpIndex)->Event;\r
230	}\r
231	\r
232	return Status;\r
233	}\r
234	\r
235	/**\r
236	Wait for all root PCI Hot Plug controller finished initializing.\r
237	\r
238	@param TimeoutInMicroSeconds Microseconds to wait for all root HPCs' initialization.\r
239	\r
240	@retval EFI_SUCCESS All HPCs initialization finished.\r
241	@retval EFI_TIMEOUT Not ALL HPCs initialization finished in Microseconds.\r
242	\r
243	**/\r
244	EFI_STATUS\r
245	AllRootHPCInitialized (\r
246	IN UINTN TimeoutInMicroSeconds\r
247	)\r
248	{\r
249	UINT32 Delay;\r
250	UINTN Index;\r
251	\r
252	Delay = (UINT32) ((TimeoutInMicroSeconds / 30) + 1);\r
253	\r
254	do {\r
255	for (Index = 0; Index < gPciRootHpcCount; Index++) {\r
256	\r
257	if (!gPciRootHpcData[Index].Initialized) {\r
258	break;\r
259	}\r
260	}\r
261	\r
262	if (Index == gPciRootHpcCount) {\r
263	return EFI_SUCCESS;\r
264	}\r
265	\r
266	//\r
267	// Stall for 30 microseconds..\r
268	//\r
269	gBS->Stall (30);\r
270	\r
271	Delay--;\r
272	\r
273	} while (Delay > 0);\r
274	\r
275	return EFI_TIMEOUT;\r
276	}\r
277	\r
278	/**\r
279	Check whether PCI-PCI bridge has PCI Hot Plug capability register block.\r
280	\r
281	@param PciIoDevice A Pointer to the PCI-PCI bridge.\r
282	\r
283	@retval TRUE PCI device is HPC.\r
284	@retval FALSE PCI device is not HPC.\r
285	\r
286	**/\r
287	BOOLEAN\r
288	IsSHPC (\r
289	IN PCI_IO_DEVICE *PciIoDevice\r
290	)\r
291	{\r
292	\r
293	EFI_STATUS Status;\r
294	UINT8 Offset;\r
295	\r
296	if (PciIoDevice == NULL) {\r
297	return FALSE;\r
298	}\r
299	\r
300	Offset = 0;\r
301	Status = LocateCapabilityRegBlock (\r
302	PciIoDevice,\r
303	EFI_PCI_CAPABILITY_ID_HOTPLUG,\r
304	&Offset,\r
305	NULL\r
306	);\r
307	\r
308	//\r
309	// If the PCI-PCI bridge has the hot plug controller build-in,\r
310	// then return TRUE;\r
311	//\r
312	if (!EFI_ERROR (Status)) {\r
313	return TRUE;\r
314	}\r
315	\r
316	return FALSE;\r
317	}\r
318	\r
319	/**\r
320	Get resource padding if the specified PCI bridge is a hot plug bus.\r
321	\r
322	@param PciIoDevice PCI bridge instance.\r
323	\r
324	**/\r
325	VOID\r
326	GetResourcePaddingForHpb (\r
327	IN PCI_IO_DEVICE *PciIoDevice\r
328	)\r
329	{\r
330	EFI_STATUS Status;\r
331	EFI_HPC_STATE State;\r
332	UINT64 PciAddress;\r
333	EFI_HPC_PADDING_ATTRIBUTES Attributes;\r
334	EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptors;\r
335	\r
336	if (IsPciHotPlugBus (PciIoDevice)) {\r
337	//\r
338	// If PCI-PCI bridge device is PCI Hot Plug bus.\r
339	//\r
340	PciAddress = EFI_PCI_ADDRESS (PciIoDevice->BusNumber, PciIoDevice->DeviceNumber, PciIoDevice->FunctionNumber, 0);\r
341	Status = gPciHotPlugInit->GetResourcePadding (\r
342	gPciHotPlugInit,\r
343	PciIoDevice->DevicePath,\r
344	PciAddress,\r
345	&State,\r
346	(VOID **) &Descriptors,\r
347	&Attributes\r
348	);\r
349	\r
350	if (EFI_ERROR (Status)) {\r
351	return;\r
352	}\r
353	\r
354	if ((State & EFI_HPC_STATE_ENABLED) != 0 && (State & EFI_HPC_STATE_INITIALIZED) != 0) {\r
355	PciIoDevice->ResourcePaddingDescriptors = Descriptors;\r
356	PciIoDevice->PaddingAttributes = Attributes;\r
357	}\r
358	\r
359	return;\r
360	}\r
361	}\r
362	\r
363	/**\r
364	Test whether PCI device is hot plug bus.\r
365	\r
366	@param PciIoDevice PCI device instance.\r
367	\r
368	@retval TRUE PCI device is a hot plug bus.\r
369	@retval FALSE PCI device is not a hot plug bus.\r
370	\r
371	**/\r
372	BOOLEAN\r
373	IsPciHotPlugBus (\r
374	PCI_IO_DEVICE *PciIoDevice\r
375	)\r
376	{\r
377	if (IsSHPC (PciIoDevice)) {\r
378	//\r
379	// If the PPB has the hot plug controller build-in,\r
380	// then return TRUE;\r
381	//\r
382	return TRUE;\r
383	}\r
384	\r
385	//\r
386	// Otherwise, see if it is a Root HPC\r
387	//\r
388	if(IsRootPciHotPlugBus (PciIoDevice->DevicePath, NULL)) {\r
389	return TRUE;\r
390	}\r
391	\r
392	return FALSE;\r
393	}\r
394	\r