From: "Bob Feng" <bob.c.feng@intel.com>
To: devel@edk2.groups.io
Cc: Foster Nong <foster.nong@intel.com>
Subject: [PATCH] MdeModulePkg: Handle InitialVFs=0 case for SR-IOV
Date: Thu, 29 Sep 2022 16:49:40 +0800 [thread overview]
Message-ID: <14266957051500e82d927d794b07e44954db06c3.1664416117.git.foster.nong@intel.com> (raw)
From: Foster Nong <foster.nong@intel.com>
Per SR-IOV spec,InitialVFs minimum is 0. Below code which use to calculate SR-IOV bus number,
if InitialVFs =0, it maybe calculate the wrong bus number.
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.nong@intel.com>
---
.../Bus/Pci/PciBusDxe/PciEnumeratorSupport.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
index 509f828b62..eb250f6f7b 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
@@ -2416,13 +2416,17 @@ CreatePciIoDevice (
//
// Calculate LastVF
//
- PFRid = EFI_PCI_RID (Bus, Device, Func);
- LastVF = PFRid + FirstVFOffset + (PciIoDevice->InitialVFs - 1) * VFStride;
+ 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);
+ }
DEBUG ((
DEBUG_INFO,
--
2.37.1.windows.1
next reply other threads:[~2022-09-29 8:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-29 8:49 Bob Feng [this message]
2022-09-29 8:54 ` [edk2-devel] [PATCH] MdeModulePkg: Handle InitialVFs=0 case for SR-IOV Ni, Ray
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