[edk2-devel] [PATCH 1/2] Mde Pkg: Support for MPAM ACPI Table
Rohit Mathew
rohit.mathew at arm.com
Tue Aug 23 21:28:50 UTC 2022
Hi Andrew,
From: Andrew Fish <afish at apple.com>
Sent: 23 August 2022 21:11
To: devel at edk2.groups.io; Rohit Mathew <Rohit.Mathew at arm.com>
Cc: username at nvidia.com; Sami Mujawar <Sami.Mujawar at arm.com>; Alexei Fedorov <Alexei.Fedorov at arm.com>; Mike Kinney <michael.d.kinney at intel.com>; gaoliming at byosoft.com.cn; zhiguang.liu at intel.com; Swatisri Kantamsetti <swatisrik at nvidia.com>; Thomas Abraham <thomas.abraham at arm.com>; Thanu Rangarajan <Thanu.Rangarajan at arm.com>; nd <nd at arm.com>
Subject: Re: [edk2-devel] [PATCH 1/2] Mde Pkg: Support for MPAM ACPI Table
On Aug 19, 2022, at 1:26 AM, Rohit Mathew <rohit.mathew at arm.com<mailto:rohit.mathew at arm.com>> wrote:
Hi Swatisri,
Thanks for the patch. Please find my comments inline marked [Rohit] -
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Sent: 16 August 2022 21:18
To: devel at edk2.groups.io<mailto:devel at edk2.groups.io>; Sami Mujawar <Sami.Mujawar at arm.com<mailto:Sami.Mujawar at arm.com>>;
Alexei Fedorov <Alexei.Fedorov at arm.com<mailto:Alexei.Fedorov at arm.com>>; michael.d.kinney at intel.com<mailto:michael.d.kinney at intel.com>;
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Cc: Swatisri Kantamsetti <swatisrik at nvidia.com<mailto:swatisrik at nvidia.com>>
Subject: [edk2-devel] [PATCH 1/2] Mde Pkg: Support for MPAM ACPI Table
From: Swatisri Kantamsetti <swatisrik at nvidia.com<mailto:swatisrik at nvidia.com>>
Added MPAM table header, MSC and Resource Node info structures
Signed-off-by: Swatisri Kantamsetti <swatisrik at nvidia.com<mailto:swatisrik at nvidia.com>>
---
MdePkg/Include/IndustryStandard/Acpi64.h | 5 ++
MdePkg/Include/IndustryStandard/Mpam.h | 69
++++++++++++++++++++++++
2 files changed, 74 insertions(+)
create mode 100644 MdePkg/Include/IndustryStandard/Mpam.h
diff --git a/MdePkg/Include/IndustryStandard/Acpi64.h
b/MdePkg/Include/IndustryStandard/Acpi64.h
index fe5ebfac2b..e54f631186 100644
--- a/MdePkg/Include/IndustryStandard/Acpi64.h
+++ b/MdePkg/Include/IndustryStandard/Acpi64.h
@@ -2952,6 +2952,11 @@ typedef struct {
///
#define
EFI_ACPI_6_4_PROCESSOR_PROPERTIES_TOPOLOGY_TABLE_STRUCTURE_SI
GNATURE SIGNATURE_32('P', 'P', 'T', 'T')
+///
+/// "MPAM" Memory System Resource Partitioning And Monitoring Table
///
+#define
+EFI_ACPI_6_4_MEMORY_SYSTEM_RESOURCE_PARTITIONING_MONITORI
NG_TABLE_STRUC
+TURE_SIGNATURE SIGNATURE_32('M', 'P', 'A', 'M')
+
///
/// "PSDT" Persistent System Description Table /// diff --git
a/MdePkg/Include/IndustryStandard/Mpam.h
b/MdePkg/Include/IndustryStandard/Mpam.h
new file mode 100644
index 0000000000..e0f75f0114
--- /dev/null
+++ b/MdePkg/Include/IndustryStandard/Mpam.h
@@ -0,0 +1,69 @@
+/** @file
+ ACPI Memory System Resource Partitioning And Monitoring (MPAM)
+ as specified in ARM spec DEN0065
+
+ Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
+ Copyright (c) 2022, ARM Limited. All rights reserved.
+ SPDX-License-Identifier: BSD-2-Clause-Patent **/
+
+#ifndef _MPAM_H_
+#define _MPAM_H_
+
+#pragma pack(1)
+
+///
+/// Memory System Resource Partitioning and Monitoring Table (MPAM)
///
+typedef struct {
+ EFI_ACPI_DESCRIPTION_HEADER Header;
+ UINT32 NumNodes;
+ UINT32 NodeOffset;
+ UINT32 Reserved;
+}
+EFI_ACPI_6_4_MEMORY_SYSTEM_RESOURCE_PARTITIONING_MONITORI
NG_TABLE_HEADE
+R;
[Rohit] Shouldn't the header be followed by MSC node body type as defined in MPAM ACPI 1.0, section 2, table 3 - The MPAM table and section 2.1, table 4 - MSC Node body?
+
+///
+/// MPAM Revision (as defined in ACPI 6.4 spec.) /// #define
+EFI_ACPI_6_4_MEMORY_SYSTEM_RESOURCE_PARTITIONING_MONITORI
NG_TABLE_REVIS
+ION 0x01
+
+///
+/// Memory System Controller Node Structure ///
+
+typedef struct {
+ UINT16 Length;
+ UINT16 Reserved;
+ UINT32 Identifier;
+ UINT64 BaseAddress;
+ UINT32 MmioSize;
+ UINT32 OverflowInterrupt;
+ UINT32 OverflowInterruptFlags;
[Rohit] Would it be better to have a type (possibly bitfield struct) instead of a plain UINT32 for Flags? (MPAM ACPI 1.0, section 2.1.1, table 5 - Interrupt flags)
Probably better NOT to use bitfields in APIs that are produced and consumed by different worlds. While the the UEFI does speak to the bit order of or a bitfield the rules around packing of bitfields is compiler defined.
I just saw a bug last week with bitfield compatibility that was introduced by clang fixing its -mms-bitfields implementation. The GCC rules for packing bitfields is different than VC++ so that is why the compiler flag -mms-bitfields exists in the 1st place . A clang -mms-bitfields bug got fixed and it broke the code as the extra padding required by VC++ got added to the bitfield.
[Rohit] Thanks for bringing this point. I think, this type could be left untouched in that case.
Thanks,
Andrew Fish
+ UINT32 Reserved1;
+ UINT32 OverflowInterruptAff;
+ UINT32 ErrorInterrupt;
+ UINT32 ErrorInterruptFlags;
[Rohit ] Same comment as before above.
+ UINT32 Reserved2;
+ UINT32 ErrorInterruptAff;
+ UINT32 MaxNRdyUsec;
+ UINT64 LinkedDeviceHwId;
+ UINT32 LinkedDeviceInstanceHwId;
+ UINT32 NumResourceNodes;
+} EFI_ACPI_6_4_MPAM_MSC_NODE;
+
+///
+/// Resource Node Structure
+///
+
+typedef struct {
+ UINT32 Identifier;
+ UINT8 RisIndex;
+ UINT16 Reserved1;
+ UINT8 LocatorType;
+ UINT64 Locator;
[Rohit ] Shouldn't " Locator " field be 12 bytes in size, possibly a separate type? (MPAM ACPI 1.0, section 2.2, table 7 - Resource node and section 2.3.2 table 10 - locator descriptor)
+ UINT32 NumFuncDep;
+} EFI_ACPI_6_4_MPAM_RESOURCE_NODE;
[Rohit] Since "NumFuncDep" field is part of EFI_ACPI_6_4_MPAM_RESOURCE_NODE type and this could be non-zero, should we also need the type for functional dependency descriptors? (MPAM ACPI 1.0, section 2.2.1, table 8 - Functional dependency descriptor)
[Rohit] Also, could some of the commonly used macros be added to this header, please? (location types, MPAM interrupt mode, interrupt types, affinity type, etc)
+
+#pragma pack()
+
+#endif
--
2.17.1
Regards,
Rohit
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