[PATCH v2 5/8] DynamicTablesPkg: IORT set reference to Id array only if present


Sami Mujawar
 

The IORT table generator is setting up a reference to ID array for
nodes even when the ID Mapping count is zero. This is not an issue as an
OS would only access the ID Reference if the ID mapping count is not zero.

However, it would be good to set the reference to ID array to zero when
the ID Mapping count is zero rather than populating it with an incorrect
value.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
---

Notes:
v2:
- No code change since v1. Re-sending with v2 series. [SAMI]

DynamicTablesPkg/Library/Acpi/Arm/AcpiIortLibArm/IortGenerator.c | 29 +++++++++++---------
1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/DynamicTablesPkg/Library/Acpi/Arm/AcpiIortLibArm/IortGenerator.c b/DynamicTablesPkg/Library/Acpi/Arm/AcpiIortLibArm/IortGenerator.c
index 349caa8006bc34ca789cb3e321a0f87c0cd4ff0d..bdf839eab25e2b84b40c50da38f2bf961cdc5f42 100644
--- a/DynamicTablesPkg/Library/Acpi/Arm/AcpiIortLibArm/IortGenerator.c
+++ b/DynamicTablesPkg/Library/Acpi/Arm/AcpiIortLibArm/IortGenerator.c
@@ -1,7 +1,7 @@
/** @file
IORT Table Generator

- Copyright (c) 2017 - 2020, ARM Limited. All rights reserved.
+ Copyright (c) 2017 - 2021, Arm Limited. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

@par Reference(s):
@@ -870,9 +870,9 @@ AddNamedComponentNodes (
NcNode->Node.NumIdMappings = NodeList->IdMappingCount;

ObjectNameLength = AsciiStrLen (NodeList->ObjectName) + 1;
- NcNode->Node.IdReference =
- (UINT32)(sizeof (EFI_ACPI_6_0_IO_REMAPPING_NAMED_COMP_NODE) +
- (ALIGN_VALUE (ObjectNameLength, 4)));
+ NcNode->Node.IdReference = (NodeList->IdMappingCount == 0) ?
+ 0 : ((UINT32)(sizeof (EFI_ACPI_6_0_IO_REMAPPING_NAMED_COMP_NODE) +
+ (ALIGN_VALUE (ObjectNameLength, 4))));

// Named Component specific data
NcNode->Flags = NodeList->Flags;
@@ -990,7 +990,8 @@ AddRootComplexNodes (
RcNode->Node.Revision = 1;
RcNode->Node.Reserved = EFI_ACPI_RESERVED_DWORD;
RcNode->Node.NumIdMappings = NodeList->IdMappingCount;
- RcNode->Node.IdReference = sizeof (EFI_ACPI_6_0_IO_REMAPPING_RC_NODE);
+ RcNode->Node.IdReference = (NodeList->IdMappingCount == 0) ?
+ 0 : sizeof (EFI_ACPI_6_0_IO_REMAPPING_RC_NODE);

// Root Complex specific data
RcNode->CacheCoherent = NodeList->CacheCoherent;
@@ -1160,11 +1161,12 @@ AddSmmuV1V2Nodes (
SmmuNode->Node.Revision = 0;
SmmuNode->Node.Reserved = EFI_ACPI_RESERVED_DWORD;
SmmuNode->Node.NumIdMappings = NodeList->IdMappingCount;
- SmmuNode->Node.IdReference = sizeof (EFI_ACPI_6_0_IO_REMAPPING_SMMU_NODE) +
- (NodeList->ContextInterruptCount *
- sizeof (EFI_ACPI_6_0_IO_REMAPPING_SMMU_INT)) +
- (NodeList->PmuInterruptCount *
- sizeof (EFI_ACPI_6_0_IO_REMAPPING_SMMU_INT));
+ SmmuNode->Node.IdReference = (NodeList->IdMappingCount == 0) ?
+ 0 : (sizeof (EFI_ACPI_6_0_IO_REMAPPING_SMMU_NODE) +
+ (NodeList->ContextInterruptCount *
+ sizeof (EFI_ACPI_6_0_IO_REMAPPING_SMMU_INT)) +
+ (NodeList->PmuInterruptCount *
+ sizeof (EFI_ACPI_6_0_IO_REMAPPING_SMMU_INT)));

// SMMU v1/v2 specific data
SmmuNode->Base = NodeList->BaseAddress;
@@ -1319,8 +1321,8 @@ AddSmmuV3Nodes (
SmmuV3Node->Node.Revision = 2;
SmmuV3Node->Node.Reserved = EFI_ACPI_RESERVED_DWORD;
SmmuV3Node->Node.NumIdMappings = NodeList->IdMappingCount;
- SmmuV3Node->Node.IdReference =
- sizeof (EFI_ACPI_6_0_IO_REMAPPING_SMMU3_NODE);
+ SmmuV3Node->Node.IdReference = (NodeList->IdMappingCount == 0) ?
+ 0 : sizeof (EFI_ACPI_6_0_IO_REMAPPING_SMMU3_NODE);

// SMMUv3 specific data
SmmuV3Node->Base = NodeList->BaseAddress;
@@ -1438,7 +1440,8 @@ AddPmcgNodes (
PmcgNode->Node.Revision = 1;
PmcgNode->Node.Reserved = EFI_ACPI_RESERVED_DWORD;
PmcgNode->Node.NumIdMappings = NodeList->IdMappingCount;
- PmcgNode->Node.IdReference = sizeof (EFI_ACPI_6_0_IO_REMAPPING_PMCG_NODE);
+ PmcgNode->Node.IdReference = (NodeList->IdMappingCount == 0) ?
+ 0 : sizeof (EFI_ACPI_6_0_IO_REMAPPING_PMCG_NODE);

// PMCG specific data
PmcgNode->Base = NodeList->BaseAddress;
--
'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'