[PATCH v2 09/15] DynamicTablesPkg: FdtHwInfoParser: Add MSI Frame parser

["PierreGondois" <pierre.gondois@arm.com>]

From: Pierre Gondois <Pierre.Gondois@arm.com>

Arm GIC version 2 systems that support Message Signalled Interrupts
implement GICv2m MSI frame(s). Each GICv2m MSI frame consists of a
4k page which includes registers to generate message signalled
interrupts to an associated GIC distributor. The frame also includes
registers to discover the set of distributor lines which may be
signalled by MSIs from that frame. A system may have multiple MSI
frames, and separate frames may be defined for secure and non-secure
access.

A MSI Frame structure is part of the Multiple APIC Description Table
(MADT) and must only be used to describe non-secure MSI frames.

The MSI Frame information is described in the platform Device Tree,
the bindings for which can be found at:
 - linux/Documentation/devicetree/bindings/interrupt-controller/
   arm,gic.yaml
 - linux/Documentation/devicetree/bindings/interrupt-controller/
   arm,gic-v3.yaml

The FdtHwInfoParser implements a MSI Frame Parser that parses
the platform Device Tree to create CM_ARM_GIC_MSI_FRAME_INFO
objects which are encapsulated in a Configuration Manager
descriptor object and added to the platform information
repository.

The platform Configuration Manager can then utilise this
information when generating the MADT table.

Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
---
 .../Gic/ArmGicMsiFrameParser.c                | 214 ++++++++++++++++++
 .../Gic/ArmGicMsiFrameParser.h                |  50 ++++
 2 files changed, 264 insertions(+)
 create mode 100644 DynamicTablesPkg/Library/FdtHwInfoParserLib/Gic/ArmGicMsiFrameParser.c
 create mode 100644 DynamicTablesPkg/Library/FdtHwInfoParserLib/Gic/ArmGicMsiFrameParser.h

diff --git a/DynamicTablesPkg/Library/FdtHwInfoParserLib/Gic/ArmGicMsiFrameParser.c b/DynamicTablesPkg/Library/FdtHwInfoParserLib/Gic/ArmGicMsiFrameParser.c
new file mode 100644
index 000000000000..9e6715f69ce7
--- /dev/null
+++ b/DynamicTablesPkg/Library/FdtHwInfoParserLib/Gic/ArmGicMsiFrameParser.c
@@ -0,0 +1,214 @@
+/** @file
+  Arm Gic Msi frame Parser.
+
+  Copyright (c) 2021, ARM Limited. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+  @par Reference(s):
+  - linux/Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml
+  - linux/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml
+**/
+
+#include "CmObjectDescUtility.h"
+#include "FdtHwInfoParser.h"
+#include "Gic/ArmGicDispatcher.h"
+#include "Gic/ArmGicMsiFrameParser.h"
+
+/** List of "compatible" property values for Msi-frame nodes.
+
+  Any other "compatible" value is not supported by this module.
+*/
+STATIC CONST COMPATIBILITY_STR MsiFrameCompatibleStr[] = {
+  {"arm,gic-v2m-frame"}
+};
+
+/** COMPATIBILITY_INFO structure for the MSI frame.
+*/
+STATIC CONST COMPATIBILITY_INFO MsiFrameCompatibleInfo = {
+  ARRAY_SIZE (MsiFrameCompatibleStr),
+  MsiFrameCompatibleStr
+};
+
+/** Parse a Msi frame node.
+
+  @param [in]  Fdt            Pointer to a Flattened Device Tree (Fdt).
+  @param [in]  MsiFrameNode   Offset of a Msi frame node.
+  @param [in]  MsiFrameId     Frame ID.
+  @param [out] MsiFrameInfo   The CM_ARM_GIC_MSI_FRAME_INFO to populate.
+
+  @retval EFI_SUCCESS             The function completed successfully.
+  @retval EFI_ABORTED             An error occurred.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+MsiFrameNodeParser (
+  IN  CONST VOID                  * Fdt,
+  IN  INT32                         MsiFrameNode,
+  IN  UINT32                        MsiFrameId,
+  OUT CM_ARM_GIC_MSI_FRAME_INFO   * MsiFrameInfo
+  )
+{
+  EFI_STATUS    Status;
+  INT32         AddressCells;
+  CONST UINT8 * Data;
+  INT32         DataSize;
+
+  if ((Fdt == NULL) ||
+      (MsiFrameInfo == NULL)) {
+    ASSERT (0);
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Status = FdtGetParentAddressInfo (Fdt, MsiFrameNode, &AddressCells, NULL);
+  if (EFI_ERROR (Status)) {
+    ASSERT (0);
+    return Status;
+  }
+
+  // Don't support more than 64 bits and less than 32 bits addresses.
+  if ((AddressCells < 1)  ||
+      (AddressCells > 2)) {
+    ASSERT (0);
+    return EFI_ABORTED;
+  }
+
+  Data = fdt_getprop (Fdt, MsiFrameNode, "reg", &DataSize);
+  if ((Data == NULL) || (DataSize < (INT32)(AddressCells * sizeof (UINT32)))) {
+    // If error or not enough space.
+    ASSERT (0);
+    return EFI_ABORTED;
+  }
+
+  if (AddressCells == 2) {
+    MsiFrameInfo->PhysicalBaseAddress = fdt64_to_cpu (*(UINT64*)Data);
+  } else {
+    MsiFrameInfo->PhysicalBaseAddress = fdt32_to_cpu (*(UINT32*)Data);
+  }
+
+  MsiFrameInfo->GicMsiFrameId = MsiFrameId;
+
+  return EFI_SUCCESS;
+}
+
+/** CM_ARM_GIC_MSI_FRAME_INFO parser function.
+
+  The following structure is populated:
+  typedef struct CmArmGicMsiFrameInfo {
+    UINT32  GicMsiFrameId;                    // {Populated}
+    UINT64  PhysicalBaseAddress;              // {Populated}
+    UINT32  Flags;                            // {default = 0}
+    UINT16  SPICount;
+    UINT16  SPIBase;
+  } CM_ARM_GIC_MSI_FRAME_INFO;
+
+  A parser parses a Device Tree to populate a specific CmObj type. None,
+  one or many CmObj can be created by the parser.
+  The created CmObj are then handed to the parser's caller through the
+  HW_INFO_ADD_OBJECT interface.
+  This can also be a dispatcher. I.e. a function that not parsing a
+  Device Tree but calling other parsers.
+
+  @param [in]  FdtParserHandle A handle to the parser instance.
+  @param [in]  FdtBranch       When searching for DT node name, restrict
+                               the search to this Device Tree branch.
+
+  @retval EFI_SUCCESS             The function completed successfully.
+  @retval EFI_ABORTED             An error occurred.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+  @retval EFI_NOT_FOUND           Not found.
+  @retval EFI_UNSUPPORTED         Unsupported.
+**/
+EFI_STATUS
+EFIAPI
+ArmGicMsiFrameInfoParser (
+  IN  CONST FDT_HW_INFO_PARSER_HANDLE FdtParserHandle,
+  IN        INT32                     FdtBranch
+  )
+{
+  EFI_STATUS                  Status;
+  INT32                       MsiFrameNode;
+  UINT32                      MsiFrameNodeCount;
+
+  UINT32                      Index;
+  CM_ARM_GIC_MSI_FRAME_INFO   MsiFrameInfo;
+  VOID                      * Fdt;
+
+  if (FdtParserHandle == NULL) {
+    ASSERT (0);
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Fdt = FdtParserHandle->Fdt;
+
+  // Count the number of nodes having the "interrupt-controller" property.
+  Status = FdtCountPropNodeInBranch (
+             Fdt,
+             FdtBranch,
+             "msi-controller",
+             &MsiFrameNodeCount
+             );
+  if (EFI_ERROR (Status)) {
+    ASSERT (0);
+    return Status;
+  }
+
+  if (MsiFrameNodeCount == 0) {
+    return EFI_NOT_FOUND;
+  }
+
+  // Parse each node having the "msi-controller" property.
+  MsiFrameNode = FdtBranch;
+  for (Index = 0; Index < MsiFrameNodeCount; Index++) {
+    ZeroMem (&MsiFrameInfo, sizeof (CM_ARM_GIC_MSI_FRAME_INFO));
+
+    Status = FdtGetNextPropNodeInBranch (
+               Fdt,
+               FdtBranch,
+               "msi-controller",
+               &MsiFrameNode
+               );
+    if (EFI_ERROR (Status)) {
+      ASSERT (0);
+      if (Status == EFI_NOT_FOUND) {
+        // Should have found the node.
+        Status = EFI_ABORTED;
+      }
+      return Status;
+    }
+
+    if (!FdtNodeIsCompatible (Fdt, MsiFrameNode, &MsiFrameCompatibleInfo)) {
+      ASSERT (0);
+      Status = EFI_UNSUPPORTED;
+      return Status;
+    }
+
+    // Parse the Msi information.
+    Status = MsiFrameNodeParser (
+               Fdt,
+               MsiFrameNode,
+               Index,
+               &MsiFrameInfo
+               );
+    if (EFI_ERROR (Status)) {
+      ASSERT (0);
+      return Status;
+    }
+
+    // Add the CmObj to the Configuration Manager.
+    Status = AddSingleCmObj (
+               FdtParserHandle,
+               CREATE_CM_ARM_OBJECT_ID (EArmObjGicMsiFrameInfo),
+               &MsiFrameInfo,
+               sizeof (CM_ARM_GIC_MSI_FRAME_INFO),
+               NULL
+               );
+    if (EFI_ERROR (Status)) {
+      ASSERT (0);
+      return Status;
+    }
+  } // for
+
+  return Status;
+}
diff --git a/DynamicTablesPkg/Library/FdtHwInfoParserLib/Gic/ArmGicMsiFrameParser.h b/DynamicTablesPkg/Library/FdtHwInfoParserLib/Gic/ArmGicMsiFrameParser.h
new file mode 100644
index 000000000000..40f83010a686
--- /dev/null
+++ b/DynamicTablesPkg/Library/FdtHwInfoParserLib/Gic/ArmGicMsiFrameParser.h
@@ -0,0 +1,50 @@
+/** @file
+  Arm Gic Msi frame Parser.
+
+  Copyright (c) 2021, ARM Limited. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+  @par Reference(s):
+  - linux/Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml
+  - linux/Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml
+**/
+
+#ifndef ARM_GIC_MSI_FRAME_PARSER_H_
+#define ARM_GIC_MSI_FRAME_PARSER_H_
+
+/** CM_ARM_GIC_MSI_FRAME_INFO parser function.
+
+  The following structure is populated:
+  typedef struct CmArmGicMsiFrameInfo {
+    UINT32  GicMsiFrameId;                    // {Populated}
+    UINT64  PhysicalBaseAddress;              // {Populated}
+    UINT32  Flags;                            // {default = 0}
+    UINT16  SPICount;
+    UINT16  SPIBase;
+  } CM_ARM_GIC_MSI_FRAME_INFO;
+
+  A parser parses a Device Tree to populate a specific CmObj type. None,
+  one or many CmObj can be created by the parser.
+  The created CmObj are then handed to the parser's caller through the
+  HW_INFO_ADD_OBJECT interface.
+  This can also be a dispatcher. I.e. a function that not parsing a
+  Device Tree but calling other parsers.
+
+  @param [in]  FdtParserHandle A handle to the parser instance.
+  @param [in]  FdtBranch       When searching for DT node name, restrict
+                               the search to this Device Tree branch.
+
+  @retval EFI_SUCCESS             The function completed successfully.
+  @retval EFI_ABORTED             An error occurred.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+  @retval EFI_NOT_FOUND           Not found.
+  @retval EFI_UNSUPPORTED         Unsupported.
+**/
+EFI_STATUS
+EFIAPI
+ArmGicMsiFrameInfoParser (
+  IN  CONST FDT_HW_INFO_PARSER_HANDLE FdtParserHandle,
+  IN        INT32                     FdtBranch
+  );
+
+#endif // ARM_GIC_MSI_FRAME_PARSER_H_
-- 
2.17.1