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/** @file
Provide common utility functions to PciHostBridgeLib instances in
ArmVirtPkg and OvmfPkg.
Copyright (C) 2016, Red Hat, Inc.
Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2020, Huawei Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <IndustryStandard/Acpi10.h>
#include <IndustryStandard/Q35MchIch9.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/DevicePathLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/PcdLib.h>
#include <Library/PciHostBridgeUtilityLib.h>
#pragma pack(1)
typedef struct {
ACPI_HID_DEVICE_PATH AcpiDevicePath;
EFI_DEVICE_PATH_PROTOCOL EndDevicePath;
} OVMF_PCI_ROOT_BRIDGE_DEVICE_PATH;
#pragma pack ()
GLOBAL_REMOVE_IF_UNREFERENCED
CHAR16 *mPciHostBridgeUtilityLibAcpiAddressSpaceTypeStr[] = {
L"Mem", L"I/O", L"Bus"
};
STATIC
CONST
OVMF_PCI_ROOT_BRIDGE_DEVICE_PATH mRootBridgeDevicePathTemplate = {
{
{
ACPI_DEVICE_PATH,
ACPI_DP,
{
(UINT8) (sizeof(ACPI_HID_DEVICE_PATH)),
(UINT8) ((sizeof(ACPI_HID_DEVICE_PATH)) >> 8)
}
},
EISA_PNP_ID(0x0A03), // HID
0 // UID
},
{
END_DEVICE_PATH_TYPE,
END_ENTIRE_DEVICE_PATH_SUBTYPE,
{
END_DEVICE_PATH_LENGTH,
0
}
}
};
/**
Utility function to initialize a PCI_ROOT_BRIDGE structure.
@param[in] Supports Supported attributes.
@param[in] Attributes Initial attributes.
@param[in] AllocAttributes Allocation attributes.
@param[in] RootBusNumber The bus number to store in RootBus.
@param[in] MaxSubBusNumber The inclusive maximum bus number that can be
assigned to any subordinate bus found behind any
PCI bridge hanging off this root bus.
The caller is repsonsible for ensuring that
RootBusNumber <= MaxSubBusNumber. If
RootBusNumber equals MaxSubBusNumber, then the
root bus has no room for subordinate buses.
@param[in] Io IO aperture.
@param[in] Mem MMIO aperture.
@param[in] MemAbove4G MMIO aperture above 4G.
@param[in] PMem Prefetchable MMIO aperture.
@param[in] PMemAbove4G Prefetchable MMIO aperture above 4G.
@param[out] RootBus The PCI_ROOT_BRIDGE structure (allocated by the
caller) that should be filled in by this
function.
@retval EFI_SUCCESS Initialization successful. A device path
consisting of an ACPI device path node, with
UID = RootBusNumber, has been allocated and
linked into RootBus.
@retval EFI_OUT_OF_RESOURCES Memory allocation failed.
**/
EFI_STATUS
EFIAPI
PciHostBridgeUtilityInitRootBridge (
IN UINT64 Supports,
IN UINT64 Attributes,
IN UINT64 AllocAttributes,
IN UINT8 RootBusNumber,
IN UINT8 MaxSubBusNumber,
IN PCI_ROOT_BRIDGE_APERTURE *Io,
IN PCI_ROOT_BRIDGE_APERTURE *Mem,
IN PCI_ROOT_BRIDGE_APERTURE *MemAbove4G,
IN PCI_ROOT_BRIDGE_APERTURE *PMem,
IN PCI_ROOT_BRIDGE_APERTURE *PMemAbove4G,
OUT PCI_ROOT_BRIDGE *RootBus
)
{
OVMF_PCI_ROOT_BRIDGE_DEVICE_PATH *DevicePath;
//
// Be safe if other fields are added to PCI_ROOT_BRIDGE later.
//
ZeroMem (RootBus, sizeof *RootBus);
RootBus->Segment = 0;
RootBus->Supports = Supports;
RootBus->Attributes = Attributes;
RootBus->DmaAbove4G = FALSE;
RootBus->AllocationAttributes = AllocAttributes;
RootBus->Bus.Base = RootBusNumber;
RootBus->Bus.Limit = MaxSubBusNumber;
CopyMem (&RootBus->Io, Io, sizeof (*Io));
CopyMem (&RootBus->Mem, Mem, sizeof (*Mem));
CopyMem (&RootBus->MemAbove4G, MemAbove4G, sizeof (*MemAbove4G));
CopyMem (&RootBus->PMem, PMem, sizeof (*PMem));
CopyMem (&RootBus->PMemAbove4G, PMemAbove4G, sizeof (*PMemAbove4G));
RootBus->NoExtendedConfigSpace = (PcdGet16 (PcdOvmfHostBridgePciDevId) !=
INTEL_Q35_MCH_DEVICE_ID);
DevicePath = AllocateCopyPool (sizeof mRootBridgeDevicePathTemplate,
&mRootBridgeDevicePathTemplate);
if (DevicePath == NULL) {
DEBUG ((DEBUG_ERROR, "%a: %r\n", __FUNCTION__, EFI_OUT_OF_RESOURCES));
return EFI_OUT_OF_RESOURCES;
}
DevicePath->AcpiDevicePath.UID = RootBusNumber;
RootBus->DevicePath = (EFI_DEVICE_PATH_PROTOCOL *)DevicePath;
DEBUG ((DEBUG_INFO,
"%a: populated root bus %d, with room for %d subordinate bus(es)\n",
__FUNCTION__, RootBusNumber, MaxSubBusNumber - RootBusNumber));
return EFI_SUCCESS;
}
/**
Utility function to uninitialize a PCI_ROOT_BRIDGE structure set up with
PciHostBridgeUtilityInitRootBridge().
@param[in] RootBus The PCI_ROOT_BRIDGE structure, allocated by the caller and
initialized with PciHostBridgeUtilityInitRootBridge(),
that should be uninitialized. This function doesn't free
RootBus.
**/
VOID
EFIAPI
PciHostBridgeUtilityUninitRootBridge (
IN PCI_ROOT_BRIDGE *RootBus
)
{
FreePool (RootBus->DevicePath);
}
/**
Utility function to inform the platform that the resource conflict happens.
@param[in] Configuration Pointer to PCI I/O and PCI memory resource
descriptors. The Configuration contains the
resources for all the root bridges. The resource
for each root bridge is terminated with END
descriptor and an additional END is appended
indicating the end of the entire resources. The
resource descriptor field values follow the
description in
EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
.SubmitResources().
**/
VOID
EFIAPI
PciHostBridgeUtilityResourceConflict (
IN VOID *Configuration
)
{
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;
UINTN RootBridgeIndex;
DEBUG ((DEBUG_ERROR, "PciHostBridge: Resource conflict happens!\n"));
RootBridgeIndex = 0;
Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Configuration;
while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {
DEBUG ((DEBUG_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));
for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {
ASSERT (Descriptor->ResType <
ARRAY_SIZE (mPciHostBridgeUtilityLibAcpiAddressSpaceTypeStr)
);
DEBUG ((DEBUG_ERROR, " %s: Length/Alignment = 0x%lx / 0x%lx\n",
mPciHostBridgeUtilityLibAcpiAddressSpaceTypeStr[Descriptor->ResType],
Descriptor->AddrLen, Descriptor->AddrRangeMax
));
if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {
DEBUG ((DEBUG_ERROR, " Granularity/SpecificFlag = %ld / %02x%s\n",
Descriptor->AddrSpaceGranularity, Descriptor->SpecificFlag,
((Descriptor->SpecificFlag &
EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE
) != 0) ? L" (Prefetchable)" : L""
));
}
}
//
// Skip the END descriptor for root bridge
//
ASSERT (Descriptor->Desc == ACPI_END_TAG_DESCRIPTOR);
Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)(
(EFI_ACPI_END_TAG_DESCRIPTOR *)Descriptor + 1
);
}
}
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