diff options
Diffstat (limited to 'MdeModulePkg')
| -rw-r--r-- | MdeModulePkg/Bus/Pci/PciBusDxe/PciHotPlugSupport.c | 96 | ||||
| -rw-r--r-- | MdeModulePkg/Bus/Pci/PciBusDxe/PciHotPlugSupport.h | 21 |
2 files changed, 117 insertions, 0 deletions
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciHotPlugSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciHotPlugSupport.c index ca8766869a..73bcd32788 100644 --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciHotPlugSupport.c +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciHotPlugSupport.c @@ -317,6 +317,94 @@ IsSHPC ( }
/**
+ Check whether PciIoDevice supports PCIe hotplug.
+
+ This is equivalent to the following condition:
+ - the device is either a PCIe switch downstream port or a root port,
+ - and the device has the SlotImplemented bit set in its PCIe capability
+ register,
+ - and the device has the HotPlugCapable bit set in its slot capabilities
+ register.
+
+ @param[in] PciIoDevice The device being checked.
+
+ @retval TRUE PciIoDevice is a PCIe port that accepts a hotplugged device.
+ @retval FALSE Otherwise.
+
+**/
+BOOLEAN
+SupportsPcieHotplug (
+ IN PCI_IO_DEVICE *PciIoDevice
+ )
+{
+ UINT32 Offset;
+ EFI_STATUS Status;
+ PCI_REG_PCIE_CAPABILITY Capability;
+ PCI_REG_PCIE_SLOT_CAPABILITY SlotCapability;
+
+ if (PciIoDevice == NULL) {
+ return FALSE;
+ }
+
+ //
+ // Read the PCI Express Capabilities Register
+ //
+ if (!PciIoDevice->IsPciExp) {
+ return FALSE;
+ }
+ Offset = PciIoDevice->PciExpressCapabilityOffset +
+ OFFSET_OF (PCI_CAPABILITY_PCIEXP, Capability);
+ Status = PciIoDevice->PciIo.Pci.Read (
+ &PciIoDevice->PciIo,
+ EfiPciIoWidthUint16,
+ Offset,
+ 1,
+ &Capability
+ );
+ if (EFI_ERROR (Status)) {
+ return FALSE;
+ }
+
+ //
+ // Check the contents of the register
+ //
+ switch (Capability.Bits.DevicePortType) {
+ case PCIE_DEVICE_PORT_TYPE_ROOT_PORT:
+ case PCIE_DEVICE_PORT_TYPE_DOWNSTREAM_PORT:
+ break;
+ default:
+ return FALSE;
+ }
+ if (!Capability.Bits.SlotImplemented) {
+ return FALSE;
+ }
+
+ //
+ // Read the Slot Capabilities Register
+ //
+ Offset = PciIoDevice->PciExpressCapabilityOffset +
+ OFFSET_OF (PCI_CAPABILITY_PCIEXP, SlotCapability);
+ Status = PciIoDevice->PciIo.Pci.Read (
+ &PciIoDevice->PciIo,
+ EfiPciIoWidthUint32,
+ Offset,
+ 1,
+ &SlotCapability
+ );
+ if (EFI_ERROR (Status)) {
+ return FALSE;
+ }
+
+ //
+ // Check the contents of the register
+ //
+ if (SlotCapability.Bits.HotPlugCapable) {
+ return TRUE;
+ }
+ return FALSE;
+}
+
+/**
Get resource padding if the specified PCI bridge is a hot plug bus.
@param PciIoDevice PCI bridge instance.
@@ -382,6 +470,14 @@ IsPciHotPlugBus ( return TRUE;
}
+ if (SupportsPcieHotplug (PciIoDevice)) {
+ //
+ // If the PPB is a PCIe root complex port or a switch downstream port, and
+ // implements a hot-plug capable slot, then also return TRUE.
+ //
+ return TRUE;
+ }
+
//
// Otherwise, see if it is a Root HPC
//
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciHotPlugSupport.h b/MdeModulePkg/Bus/Pci/PciBusDxe/PciHotPlugSupport.h index 1fb9ba9720..a285d94c93 100644 --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciHotPlugSupport.h +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciHotPlugSupport.h @@ -177,6 +177,27 @@ IsSHPC ( );
/**
+ Check whether PciIoDevice supports PCIe hotplug.
+
+ This is equivalent to the following condition:
+ - the device is either a PCIe switch downstream port or a root port,
+ - and the device has the SlotImplemented bit set in its PCIe capability
+ register,
+ - and the device has the HotPlugCapable bit set in its slot capabilities
+ register.
+
+ @param[in] PciIoDevice The device being checked.
+
+ @retval TRUE PciIoDevice is a PCIe port that accepts a hotplugged device.
+ @retval FALSE Otherwise.
+
+**/
+BOOLEAN
+SupportsPcieHotplug (
+ IN PCI_IO_DEVICE *PciIoDevice
+ );
+
+/**
Get resource padding if the specified PCI bridge is a hot plug bus.
@param PciIoDevice PCI bridge instance.
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