Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: de103f1981cfca90dd19296d4b20449a2b93dc26
https://github.com/tianocore/edk2/commit/de103f1981cfca90dd19296d4b20449a2b93dc26
Author: Foster Nong <foster.n...@intel.com>
Date: 2022-10-08 (Sat, 08 Oct 2022)
Changed paths:
M MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
Log Message:
-----------
MdeModulePkg: Handle InitialVFs=0 case for SR-IOV
Per the section 3.3.5 SR-IOV spec v1.1, InitialVFs (0ch).
InitialVFs indicates to SR-PCIM the number of VFs that are initially associated
with the PF.
The minimum value of InitialVFs is 0.
Below code is used to calculate SR-IOV reserved bus number,
if InitialVFs =0, it maybe calculate the wrong bus number in this case.
LastVF = PFRid + FirstVFOffset + (PciIoDevice->InitialVFs - 1) * VFStride
we can fix it with below code:
if (PciIoDevice->InitialVFs == 0) {
PciIoDevice->ReservedBusNum = 0;
} else {
PFRid = EFI_PCI_RID (Bus, Device, Func);
LastVF = PFRid + FirstVFOffset + (PciIoDevice->InitialVFs - 1) * VFStride;
//
// Calculate ReservedBusNum for this PF
//
PciIoDevice->ReservedBusNum = (UINT16)(EFI_PCI_BUS_OF_RID (LastVF) - Bus + 1);
//
// Calculate ReservedBusNum for this PF
//
PciIoDevice->ReservedBusNum = (UINT16)(EFI_PCI_BUS_OF_RID (LastVF) - Bus + 1);
}
https://bugzilla.tianocore.org/show_bug.cgi?id=4069
Signed-off-by: Foster Nong <foster.n...@intel.com>
Reviewed-by: Ray Ni <ray...@intel.com>
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