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MdeModuelPkg/PciBus: Return AddrTranslationOffset in GetBarAttributes 

Some platform doesn't use CPU(HOST)/Device 1:1 mapping for PCI Bus.
But PCI IO doesn't have interface to tell caller (device driver)
whether the address returned by GetBarAttributes() is HOST address
or device address.
UEFI Spec 2.6 addresses this issue by clarifying the address returned
is HOST address and caller can use AddrTranslationOffset to calculate
the device address.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Ruiyu Ni 2016-02-17 18:06:36 +08:00
parent e90f51a822
commit 7b0a1ead7d
1 changed files with 62 additions and 0 deletions
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62
MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c
View File

@ -1743,6 +1743,53 @@ PciIoAttributes (
return Status;
}
/**
Retrieve the AddrTranslationOffset from RootBridgeIo for the
specified range.
@param RootBridgeIo Root Bridge IO instance.
@param AddrRangeMin The base address of the MMIO.
@param AddrLen The length of the MMIO.
@retval The AddrTranslationOffset from RootBridgeIo for the
specified range, or (UINT64) -1 if the range is not
found in RootBridgeIo.
**/
UINT64
GetMmioAddressTranslationOffset (
EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *RootBridgeIo,
UINT64 AddrRangeMin,
UINT64 AddrLen
)
{
EFI_STATUS Status;
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Configuration;
Status = RootBridgeIo->Configuration (
RootBridgeIo,
(VOID **) &Configuration
);
if (EFI_ERROR (Status)) {
return (UINT64) -1;
}
while (Configuration->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {
if ((Configuration->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) &&
(Configuration->AddrRangeMin <= AddrRangeMin) &&
(Configuration->AddrRangeMin + Configuration->AddrLen >= AddrRangeMin + AddrLen)
) {
return Configuration->AddrTranslationOffset;
}
Configuration++;
}
//
// The resource occupied by BAR should be in the range reported by RootBridge.
//
ASSERT (FALSE);
return (UINT64) -1;
}
/**
Gets the attributes that this PCI controller supports setting on a BAR using
SetBarAttributes(), and retrieves the list of resource descriptors for a BAR.
@ -1867,6 +1914,21 @@ PciIoGetBarAttributes (
End = (EFI_ACPI_END_TAG_DESCRIPTOR *) (Descriptor + 1);
End->Desc = ACPI_END_TAG_DESCRIPTOR;
End->Checksum = 0;
//
// Get the Address Translation Offset
//
if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {
Descriptor->AddrTranslationOffset = GetMmioAddressTranslationOffset (
PciIoDevice->PciRootBridgeIo,
Descriptor->AddrRangeMin,
Descriptor->AddrLen
);
if (Descriptor->AddrTranslationOffset == (UINT64) -1) {
FreePool (Descriptor);
return EFI_UNSUPPORTED;
}
}
}
return EFI_SUCCESS;