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According to Volume 5 of the PI spec, 10.8.2 PCI Host Bridge Resource
Allocation Protocol, SubmitResources(),
It is considered an error if no resource requests are submitted for a
PCI root bridge. If a PCI root bridge does not require any resources, a
zero-length resource request must explicitly be submitted.
Under MdeModulePkg/Bus/Pci/PciBusDxe/, we have:
PciHostBridgeResourceAllocator() [PciLib.c]
ConstructAcpiResourceRequestor(..., &AcpiConfig) [PciEnumerator.c]
PciResAlloc->SubmitResources(..., &AcpiConfig)
ASSERT_EFI_ERROR ()
If ConstructAcpiResourceRequestor() finds no resources to request (for
example because no PCI devices are on the root bridge), it places a
zero-length EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR followed by an
EFI_ACPI_END_TAG_DESCRIPTOR in "AcpiConfig"; satisfying the PI spec.
However, PciHostBridgeDxe's SubmitResources() function does not expect
such input; the following part of the code rejects it:
switch (Ptr->ResType) {
case 0:
//
// Check invalid Address Sapce Granularity
//
if (Ptr->AddrSpaceGranularity != 32) {
return EFI_INVALID_PARAMETER;
}
Skip EFI_ACPI_ADDRESS_SPACE_DESCRIPTORs with zero AddrLen early. Also,
allow PciHostBridgeResourceAllocator() to proceed to the AllocateResources
phase by setting "ResourceSubmited" to TRUE.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Olivier Martin <Olivier.martin@arm.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16907 6f19259b-4bc3-4df7-8a09-765794883524