/** @file\r
PCI Hot Plug support functions implementation for PCI Bus module..\r
\r
-Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2006 - 2019, 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
}\r
\r
/**\r
- Compare two device pathes to check if they are exactly same.\r
+ Compare two device paths 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
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_UNSUPPORTED No PCI Hot Plug controller on the platform.\r
@retval EFI_OUT_OF_RESOURCES No memory to constructor root hot plug private\r
data structure.\r
\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
+ plug in global array when TRUE is returned.\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
@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
+ plug in global array when TRUE is returned.\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
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
+ @param Event The returned event that invoke this function.\r
\r
- @return Status of create event invoken.\r
+ @return Status of create event.\r
\r
**/\r
EFI_STATUS\r
Offset = 0;\r
Status = LocateCapabilityRegBlock (\r
PciIoDevice,\r
- EFI_PCI_CAPABILITY_ID_HOTPLUG,\r
+ EFI_PCI_CAPABILITY_ID_SHPC,\r
&Offset,\r
NULL\r
);\r
return FALSE;\r
}\r
\r
+/**\r
+ Check whether PciIoDevice supports PCIe hotplug.\r
+\r
+ This is equivalent to the following condition:\r
+ - the device is either a PCIe switch downstream port or a root port,\r
+ - and the device has the SlotImplemented bit set in its PCIe capability\r
+ register,\r
+ - and the device has the HotPlugCapable bit set in its slot capabilities\r
+ register.\r
+\r
+ @param[in] PciIoDevice The device being checked.\r
+\r
+ @retval TRUE PciIoDevice is a PCIe port that accepts a hot-plugged device.\r
+ @retval FALSE Otherwise.\r
+\r
+**/\r
+BOOLEAN\r
+SupportsPcieHotplug (\r
+ IN PCI_IO_DEVICE *PciIoDevice\r
+ )\r
+{\r
+ UINT32 Offset;\r
+ EFI_STATUS Status;\r
+ PCI_REG_PCIE_CAPABILITY Capability;\r
+ PCI_REG_PCIE_SLOT_CAPABILITY SlotCapability;\r
+\r
+ if (PciIoDevice == NULL) {\r
+ return FALSE;\r
+ }\r
+\r
+ //\r
+ // Read the PCI Express Capabilities Register\r
+ //\r
+ if (!PciIoDevice->IsPciExp) {\r
+ return FALSE;\r
+ }\r
+ Offset = PciIoDevice->PciExpressCapabilityOffset +\r
+ OFFSET_OF (PCI_CAPABILITY_PCIEXP, Capability);\r
+ Status = PciIoDevice->PciIo.Pci.Read (\r
+ &PciIoDevice->PciIo,\r
+ EfiPciIoWidthUint16,\r
+ Offset,\r
+ 1,\r
+ &Capability\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return FALSE;\r
+ }\r
+\r
+ //\r
+ // Check the contents of the register\r
+ //\r
+ switch (Capability.Bits.DevicePortType) {\r
+ case PCIE_DEVICE_PORT_TYPE_ROOT_PORT:\r
+ case PCIE_DEVICE_PORT_TYPE_DOWNSTREAM_PORT:\r
+ break;\r
+ default:\r
+ return FALSE;\r
+ }\r
+ if (!Capability.Bits.SlotImplemented) {\r
+ return FALSE;\r
+ }\r
+\r
+ //\r
+ // Read the Slot Capabilities Register\r
+ //\r
+ Offset = PciIoDevice->PciExpressCapabilityOffset +\r
+ OFFSET_OF (PCI_CAPABILITY_PCIEXP, SlotCapability);\r
+ Status = PciIoDevice->PciIo.Pci.Read (\r
+ &PciIoDevice->PciIo,\r
+ EfiPciIoWidthUint32,\r
+ Offset,\r
+ 1,\r
+ &SlotCapability\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return FALSE;\r
+ }\r
+\r
+ //\r
+ // Check the contents of the register\r
+ //\r
+ if (SlotCapability.Bits.HotPlugCapable) {\r
+ return TRUE;\r
+ }\r
+ return FALSE;\r
+}\r
+\r
/**\r
Get resource padding if the specified PCI bridge is a hot plug bus.\r
\r
return TRUE;\r
}\r
\r
+ if (SupportsPcieHotplug (PciIoDevice)) {\r
+ //\r
+ // If the PPB is a PCIe root complex port or a switch downstream port, and\r
+ // implements a hot-plug capable slot, then also return TRUE.\r
+ //\r
+ return TRUE;\r
+ }\r
+\r
//\r
// Otherwise, see if it is a Root HPC\r
//\r
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