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audk/OvmfPkg/Library/PciHostBridgeLib/PciHostBridgeLib.c

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/** @file
OVMF's instance of the PCI Host Bridge Library.
Copyright (C) 2016, Red Hat, Inc.
Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php.
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <PiDxe.h>
#include <IndustryStandard/Pci.h>
#include <IndustryStandard/Q35MchIch9.h>
#include <Protocol/PciHostBridgeResourceAllocation.h>
#include <Protocol/PciRootBridgeIo.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/DevicePathLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/PciHostBridgeLib.h>
#include <Library/PciLib.h>
#include <Library/QemuFwCfgLib.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 *mPciHostBridgeLibAcpiAddressSpaceTypeStr[] = {
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
}
}
};
/**
Initialize a PCI_ROOT_BRIDGE structure.
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[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.
**/
STATIC
EFI_STATUS
InitRootBridge (
IN UINT8 RootBusNumber,
IN UINT8 MaxSubBusNumber,
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 = EFI_PCI_ATTRIBUTE_IDE_PRIMARY_IO |
EFI_PCI_ATTRIBUTE_IDE_SECONDARY_IO |
EFI_PCI_ATTRIBUTE_ISA_IO_16 |
EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO |
EFI_PCI_ATTRIBUTE_VGA_MEMORY |
EFI_PCI_ATTRIBUTE_VGA_IO_16 |
EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16;
RootBus->Attributes = RootBus->Supports;
RootBus->DmaAbove4G = FALSE;
RootBus->AllocationAttributes = EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM;
RootBus->PMem.Base = 0;
RootBus->PMem.Limit = 0;
RootBus->PMemAbove4G.Base = 0;
RootBus->PMemAbove4G.Limit = 0;
RootBus->MemAbove4G.Base = 0;
RootBus->MemAbove4G.Limit = 0;
RootBus->Bus.Base = RootBusNumber;
RootBus->Bus.Limit = MaxSubBusNumber;
RootBus->Io.Base = PcdGet64 (PcdPciIoBase);
RootBus->Io.Limit = PcdGet64 (PcdPciIoBase) + (PcdGet64 (PcdPciIoSize) - 1);
RootBus->Mem.Base = PcdGet64 (PcdPciMmio32Base);
RootBus->Mem.Limit = PcdGet64 (PcdPciMmio32Base) +
(PcdGet64 (PcdPciMmio32Size) - 1);
RootBus->NoExtendedConfigSpace = (PcdGet16 (PcdOvmfHostBridgePciDevId) !=
INTEL_Q35_MCH_DEVICE_ID);
DevicePath = AllocateCopyPool (sizeof mRootBridgeDevicePathTemplate,
&mRootBridgeDevicePathTemplate);
if (DevicePath == NULL) {
DEBUG ((EFI_D_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 ((EFI_D_INFO,
"%a: populated root bus %d, with room for %d subordinate bus(es)\n",
__FUNCTION__, RootBusNumber, MaxSubBusNumber - RootBusNumber));
return EFI_SUCCESS;
}
/**
Uninitialize a PCI_ROOT_BRIDGE structure set up with InitRootBridge().
param[in] RootBus The PCI_ROOT_BRIDGE structure, allocated by the caller and
initialized with InitRootBridge(), that should be
uninitialized. This function doesn't free RootBus.
**/
STATIC
VOID
UninitRootBridge (
IN PCI_ROOT_BRIDGE *RootBus
)
{
FreePool (RootBus->DevicePath);
}
/**
Return all the root bridge instances in an array.
@param Count Return the count of root bridge instances.
@return All the root bridge instances in an array.
The array should be passed into PciHostBridgeFreeRootBridges()
when it's not used.
**/
PCI_ROOT_BRIDGE *
EFIAPI
PciHostBridgeGetRootBridges (
UINTN *Count
)
{
EFI_STATUS Status;
FIRMWARE_CONFIG_ITEM FwCfgItem;
UINTN FwCfgSize;
UINT64 ExtraRootBridges;
PCI_ROOT_BRIDGE *Bridges;
UINTN Initialized;
UINTN LastRootBridgeNumber;
UINTN RootBridgeNumber;
*Count = 0;
//
// QEMU provides the number of extra root buses, shortening the exhaustive
// search below. If there is no hint, the feature is missing.
//
Status = QemuFwCfgFindFile ("etc/extra-pci-roots", &FwCfgItem, &FwCfgSize);
if (EFI_ERROR (Status) || FwCfgSize != sizeof ExtraRootBridges) {
ExtraRootBridges = 0;
} else {
QemuFwCfgSelectItem (FwCfgItem);
QemuFwCfgReadBytes (FwCfgSize, &ExtraRootBridges);
if (ExtraRootBridges > PCI_MAX_BUS) {
DEBUG ((EFI_D_ERROR, "%a: invalid count of extra root buses (%Lu) "
"reported by QEMU\n", __FUNCTION__, ExtraRootBridges));
return NULL;
}
DEBUG ((EFI_D_INFO, "%a: %Lu extra root buses reported by QEMU\n",
__FUNCTION__, ExtraRootBridges));
}
//
// Allocate the "main" root bridge, and any extra root bridges.
//
Bridges = AllocatePool ((1 + (UINTN)ExtraRootBridges) * sizeof *Bridges);
if (Bridges == NULL) {
DEBUG ((EFI_D_ERROR, "%a: %r\n", __FUNCTION__, EFI_OUT_OF_RESOURCES));
return NULL;
}
Initialized = 0;
//
// The "main" root bus is always there.
//
LastRootBridgeNumber = 0;
//
// Scan all other root buses. If function 0 of any device on a bus returns a
// VendorId register value different from all-bits-one, then that bus is
// alive.
//
for (RootBridgeNumber = 1;
RootBridgeNumber <= PCI_MAX_BUS && Initialized < ExtraRootBridges;
++RootBridgeNumber) {
UINTN Device;
for (Device = 0; Device <= PCI_MAX_DEVICE; ++Device) {
if (PciRead16 (PCI_LIB_ADDRESS (RootBridgeNumber, Device, 0,
PCI_VENDOR_ID_OFFSET)) != MAX_UINT16) {
break;
}
}
if (Device <= PCI_MAX_DEVICE) {
//
// Found the next root bus. We can now install the *previous* one,
// because now we know how big a bus number range *that* one has, for any
// subordinate buses that might exist behind PCI bridges hanging off it.
//
Status = InitRootBridge ((UINT8)LastRootBridgeNumber,
(UINT8)(RootBridgeNumber - 1), &Bridges[Initialized]);
if (EFI_ERROR (Status)) {
goto FreeBridges;
}
++Initialized;
LastRootBridgeNumber = RootBridgeNumber;
}
}
//
// Install the last root bus (which might be the only, ie. main, root bus, if
// we've found no extra root buses).
//
Status = InitRootBridge ((UINT8)LastRootBridgeNumber, PCI_MAX_BUS,
&Bridges[Initialized]);
if (EFI_ERROR (Status)) {
goto FreeBridges;
}
++Initialized;
*Count = Initialized;
return Bridges;
FreeBridges:
while (Initialized > 0) {
--Initialized;
UninitRootBridge (&Bridges[Initialized]);
}
FreePool (Bridges);
return NULL;
}
/**
Free the root bridge instances array returned from
PciHostBridgeGetRootBridges().
@param The root bridge instances array.
@param The count of the array.
**/
VOID
EFIAPI
PciHostBridgeFreeRootBridges (
PCI_ROOT_BRIDGE *Bridges,
UINTN Count
)
{
if (Bridges == NULL && Count == 0) {
return;
}
ASSERT (Bridges != NULL && Count > 0);
do {
--Count;
UninitRootBridge (&Bridges[Count]);
} while (Count > 0);
FreePool (Bridges);
}
/**
Inform the platform that the resource conflict happens.
@param HostBridgeHandle Handle of the Host Bridge.
@param 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
PciHostBridgeResourceConflict (
EFI_HANDLE HostBridgeHandle,
VOID *Configuration
)
{
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;
UINTN RootBridgeIndex;
DEBUG ((EFI_D_ERROR, "PciHostBridge: Resource conflict happens!\n"));
RootBridgeIndex = 0;
Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Configuration;
while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {
DEBUG ((EFI_D_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));
for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {
ASSERT (Descriptor->ResType <
(sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr) /
sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr[0])
)
);
DEBUG ((EFI_D_ERROR, " %s: Length/Alignment = 0x%lx / 0x%lx\n",
mPciHostBridgeLibAcpiAddressSpaceTypeStr[Descriptor->ResType],
Descriptor->AddrLen, Descriptor->AddrRangeMax
));
if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {
DEBUG ((EFI_D_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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