From: Chris Ruffin <v-cruf...@microsoft.com>
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3541
Some platforms have devices which do not expose any additional
risk of DMA attacks but the BME bit cannot be disabled.
To allow MinPlatformPkg consumers to selectively exempt certain
devices from the PCI bus master test point, this change adds a
PCD to MinPlatformPkg.dec that allows those packages to specify
a list of PCI devices by S/B/D/F that should be excluded from
testing.
Cc: Chasel Chiu <chasel.c...@intel.com>
Cc: Nate DeSimone <nathaniel.l.desim...@intel.com>
Cc: Liming Gao <gaolim...@byosoft.com.cn>
Cc: Eric Dong <eric.d...@intel.com>
Cc: Chris Ruffin <v-cruf...@microsoft.com>
Co-authored-by: Michael Kubacki <michael.kuba...@microsoft.com>
Signed-off-by: Michael Kubacki <michael.kuba...@microsoft.com>
---
Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeCheckPci.c
| 37 ++++++++++++++++++--
Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/PeiCheckPci.c
| 35 ++++++++++++++++++
Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
| 4 +++
Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeTestPointCheckLib.inf
| 1 +
Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/PeiTestPointCheckLib.inf
| 1 +
5 files changed, 75 insertions(+), 3 deletions(-)
diff --git
a/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeCheckPci.c
b/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeCheckPci.c
index 514003944758..95f4fb8b7c7e 100644
--- a/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeCheckPci.c
+++ b/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeCheckPci.c
@@ -44,6 +44,13 @@ typedef struct {
UINT32 Data[48];
} PCI_CONFIG_SPACE;
+typedef struct {
+ UINT8 Segment;
+ UINT8 Bus;
+ UINT8 Device;
+ UINT8 Function;
+} EXEMPT_DEVICE;
+
#pragma pack()
VOID
@@ -256,7 +263,7 @@ TestPointCheckPciResource (
UINT16 MinBus;
UINT16 MaxBus;
BOOLEAN IsEnd;
-
+
DEBUG ((DEBUG_INFO, "==== TestPointCheckPciResource - Enter\n"));
HandleBuf = NULL;
Status = gBS->LocateHandleBuffer (
@@ -338,7 +345,7 @@ TestPointCheckPciResource (
// Device
DumpPciDevice ((UINT8)Bus, (UINT8)Device, (UINT8)Func,
&PciData);
}
-
+
//
// If this is not a multi-function device, we can leave the loop
// to deal with the next device.
@@ -360,7 +367,7 @@ TestPointCheckPciResource (
}
}
}
-
+
Done:
if (HandleBuf != NULL) {
FreePool (HandleBuf);
@@ -396,6 +403,9 @@ TestPointCheckPciBusMaster (
UINT8 HeaderType;
EFI_STATUS Status;
PCI_SEGMENT_INFO *PciSegmentInfo;
+ EXEMPT_DEVICE *ExemptDevicePcdPtr;
+ BOOLEAN ExemptDeviceFound;
+ UINTN Index;
PciSegmentInfo = GetPciSegmentInfo (&SegmentCount);
if (PciSegmentInfo == NULL) {
@@ -407,6 +417,27 @@ TestPointCheckPciBusMaster (
for (Bus = PciSegmentInfo[Segment].StartBusNumber; Bus <=
PciSegmentInfo[Segment].EndBusNumber; Bus++) {
for (Device = 0; Device <= 0x1F; Device++) {
for (Function = 0; Function <= 0x7; Function++) {
+ //
+ // Some platforms have devices which do not expose any additional
+ // risk of DMA attacks but are not able to be turned off. Allow
+ // the platform to define these devices and do not record errors
+ // for these devices.
+ //
+ ExemptDevicePcdPtr = (EXEMPT_DEVICE *) PcdGetPtr
(PcdTestPointIbvPlatformExemptPciBme);
+ ExemptDeviceFound = FALSE;
+ for (Index = 0; Index < (PcdGetSize
(PcdTestPointIbvPlatformExemptPciBme) / sizeof (EXEMPT_DEVICE)); Index++) {
+ if (Segment == ExemptDevicePcdPtr[Index].Segment
+ && Bus == ExemptDevicePcdPtr[Index].Bus
+ && Device == ExemptDevicePcdPtr[Index].Device
+ && Function == ExemptDevicePcdPtr[Index].Function) {
+ ExemptDeviceFound = TRUE;
+ }
+ }
+
+ if (ExemptDeviceFound) {
+ continue;
+ }
+
VendorId = PciSegmentRead16
(PCI_SEGMENT_LIB_ADDRESS(PciSegmentInfo[Segment].SegmentNumber, Bus, Device,
Function, PCI_VENDOR_ID_OFFSET));
//
// If VendorId = 0xffff, there does not exist a device at this
diff --git
a/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/PeiCheckPci.c
b/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/PeiCheckPci.c
index 1061f8ac1c62..25c3caba6eed 100644
--- a/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/PeiCheckPci.c
+++ b/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/PeiCheckPci.c
@@ -14,6 +14,17 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
#include <Library/PciSegmentInfoLib.h>
#include <IndustryStandard/Pci.h>
+#pragma pack(1)
+
+ typedef struct EXEMPT_DEVICE_STRUCT {
+ UINT8 Segment;
+ UINT8 Bus;
+ UINT8 Device;
+ UINT8 Function;
+} EXEMPT_DEVICE;
+
+#pragma pack()
+
EFI_STATUS
TestPointCheckPciBusMaster (
VOID
@@ -29,6 +40,9 @@ TestPointCheckPciBusMaster (
UINT8 HeaderType;
EFI_STATUS Status;
PCI_SEGMENT_INFO *PciSegmentInfo;
+ EXEMPT_DEVICE *ExemptDevicePcdPtr;
+ BOOLEAN ExemptDeviceFound;
+ UINTN Index;
PciSegmentInfo = GetPciSegmentInfo (&SegmentCount);
if (PciSegmentInfo == NULL) {
@@ -40,6 +54,27 @@ TestPointCheckPciBusMaster (
for (Bus = PciSegmentInfo[Segment].StartBusNumber; Bus <=
PciSegmentInfo[Segment].EndBusNumber; Bus++) {
for (Device = 0; Device <= 0x1F; Device++) {
for (Function = 0; Function <= 0x7; Function++) {
+ //
+ // Some platforms have devices which do not expose any additional
+ // risk of DMA attacks but are not able to be turned off. Allow
+ // the platform to define these devices and do not record errors
+ // for these devices.
+ //
+ ExemptDevicePcdPtr = (EXEMPT_DEVICE *) PcdGetPtr
(PcdTestPointIbvPlatformExemptPciBme);
+ ExemptDeviceFound = FALSE;
+ for (Index = 0; Index < (PcdGetSize
(PcdTestPointIbvPlatformExemptPciBme) / sizeof (EXEMPT_DEVICE)); Index++) {
+ if (Segment == ExemptDevicePcdPtr[Index].Segment
+ && Bus == ExemptDevicePcdPtr[Index].Bus
+ && Device == ExemptDevicePcdPtr[Index].Device
+ && Function == ExemptDevicePcdPtr[Index].Function) {
+ ExemptDeviceFound = TRUE;
+ }
+ }
+
+ if (ExemptDeviceFound) {
+ continue;
+ }
+
VendorId = PciSegmentRead16
(PCI_SEGMENT_LIB_ADDRESS(PciSegmentInfo[Segment].SegmentNumber, Bus, Device,
Function, PCI_VENDOR_ID_OFFSET));
//
// If VendorId = 0xffff, there does not exist a device at this
diff --git a/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
b/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
index bcb42f0ef9e6..259038dde4df 100644
--- a/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
+++ b/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
@@ -160,6 +160,10 @@ [PcdsFixedAtBuild, PcdsPatchableInModule]
# Stage Advanced: {0x03, 0x0F,
0x03, 0x1D, 0x3F, 0x0F, 0x0F, 0x07, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00}
gMinPlatformPkgTokenSpaceGuid.PcdTestPointIbvPlatformFeature|{0x03, 0x0F,
0x03, 0x1D, 0x3F, 0x0F, 0x0F, 0x07, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00}|VOID*|0x00100302
+ # The platform may define a list of devices that are exempt from PCI BME
testing.
+ # PCD Format is {SegmentNumber1, BusNumber1, DeviceNumber1, FunctionNumber1,
SegmentNumber2, BusNumber2, DeviceNumber2, FunctionNumber2, ...}
+
gMinPlatformPkgTokenSpaceGuid.PcdTestPointIbvPlatformExemptPciBme|{0}|VOID*|0x00100303
+
##
## The Flash relevant PCD are ineffective and will be patched basing on FDF
definitions during build.
## Set all of them to 0 here to prevent from confusion.
diff --git
a/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeTestPointCheckLib.inf
b/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeTestPointCheckLib.inf
index 2ae1db4ee483..15779eb9b6de 100644
---
a/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeTestPointCheckLib.inf
+++
b/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/DxeTestPointCheckLib.inf
@@ -106,3 +106,4 @@ [Protocols]
[Pcd]
gMinPlatformPkgTokenSpaceGuid.PcdTestPointIbvPlatformFeature
+ gMinPlatformPkgTokenSpaceGuid.PcdTestPointIbvPlatformExemptPciBme
diff --git
a/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/PeiTestPointCheckLib.inf
b/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/PeiTestPointCheckLib.inf
index 51369fcedc1e..ea6dc6b8ba34 100644
---
a/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/PeiTestPointCheckLib.inf
+++
b/Platform/Intel/MinPlatformPkg/Test/Library/TestPointCheckLib/PeiTestPointCheckLib.inf
@@ -47,6 +47,7 @@ [Sources]
[Pcd]
gMinPlatformPkgTokenSpaceGuid.PcdTestPointIbvPlatformFeature
+ gMinPlatformPkgTokenSpaceGuid.PcdTestPointIbvPlatformExemptPciBme
[Guids]
gEfiHobMemoryAllocStackGuid
--
2.28.0.windows.1
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