[edk2-devel] [PATCH v4 4/8] DynamicTablesPkg: AML Code generation to add _PRT entries
PierreGondois
pierre.gondois at arm.com
Thu Dec 9 09:25:01 UTC 2021
From: Pierre Gondois <Pierre.Gondois at arm.com>
_PRT entries can describe interrupt mapping for Pci devices. The
object is described in ACPI 6.4 s6.2.13 "_PRT (PCI Routing Table)".
Add AmlCodeGenPrtEntry() helper function to add _PRT entries
to an existing _PRT object.
To: Sami Mujawar <sami.mujawar at arm.com>
To: Alexei Fedorov <Alexei.Fedorov at arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar at arm.com>
Signed-off-by: Pierre Gondois <Pierre.Gondois at arm.com>
---
.../Include/Library/AmlLib/AmlLib.h | 52 +++++
.../Common/AmlLib/CodeGen/AmlCodeGen.c | 214 ++++++++++++++++++
2 files changed, 266 insertions(+)
diff --git a/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h b/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h
index 8949cf4d932a..9ca34f61ba88 100644
--- a/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h
+++ b/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h
@@ -891,6 +891,58 @@ AmlCodeGenNameResourceTemplate (
OUT AML_OBJECT_NODE_HANDLE *NewObjectNode OPTIONAL
);
+/** Add a _PRT entry.
+
+ AmlCodeGenPrtEntry (0x0FFFF, 0, "LNKA", 0, PrtNameNode) is
+ equivalent of the following ASL code:
+ Package (4) {
+ 0x0FFFF, // Address: Device address (([Device Id] << 16) | 0xFFFF).
+ 0, // Pin: PCI pin number of the device (0-INTA, ...).
+ LNKA // Source: Name of the device that allocates the interrupt
+ // to which the above pin is connected.
+ 0 // Source Index: Source is assumed to only describe one
+ // interrupt, so let it to index 0.
+ }
+
+ The package is added at the tail of the list of the input _PRT node
+ name:
+ Name (_PRT, Package () {
+ [Pre-existing _PRT entries],
+ [Newly created _PRT entry]
+ })
+
+ Cf. ACPI 6.4, s6.2.13 "_PRT (PCI Routing Table)"
+
+ @ingroup CodeGenApis
+
+ @param [in] Address Address. Cf ACPI 6.4 specification, Table 6.2:
+ "ADR Object Address Encodings":
+ High word-Device #, Low word-Function #. (for
+ example, device 3, function 2 is 0x00030002).
+ To refer to all the functions on a device #,
+ use a function number of FFFF).
+ @param [in] Pin PCI pin number of the device (0-INTA ... 3-INTD).
+ Must be between 0-3.
+ @param [in] LinkName Link Name, i.e. device in the AML NameSpace
+ describing the interrupt used.
+ The input string is copied.
+ @param [in] SourceIndex Source index or GSIV.
+ @param [in] PrtNameNode Prt Named node to add the object to ....
+
+ @retval EFI_SUCCESS Success.
+ @retval EFI_INVALID_PARAMETER Invalid parameter.
+ @retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
+**/
+EFI_STATUS
+EFIAPI
+AmlAddPrtEntry (
+ IN UINT32 Address,
+ IN UINT8 Pin,
+ IN CONST CHAR8 *LinkName,
+ IN UINT32 SourceIndex,
+ IN AML_OBJECT_NODE_HANDLE PrtNameNode
+ );
+
/** AML code generation for a Device object node.
AmlCodeGenDevice ("COM0", ParentNode, NewObjectNode) is
diff --git a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
index 778e3c5ffaf0..d245848ce3fa 100644
--- a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
+++ b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
@@ -868,6 +868,220 @@ AmlCodeGenNameResourceTemplate (
return Status;
}
+/** Add a _PRT entry.
+
+ AmlCodeGenPrtEntry (0x0FFFF, 0, "LNKA", 0, PrtNameNode) is
+ equivalent of the following ASL code:
+ Package (4) {
+ 0x0FFFF, // Address: Device address (([Device Id] << 16) | 0xFFFF).
+ 0, // Pin: PCI pin number of the device (0-INTA, ...).
+ LNKA // Source: Name of the device that allocates the interrupt
+ // to which the above pin is connected.
+ 0 // Source Index: Source is assumed to only describe one
+ // interrupt, so let it to index 0.
+ }
+
+ The package is added at the tail of the list of the input _PRT node
+ name:
+ Name (_PRT, Package () {
+ [Pre-existing _PRT entries],
+ [Newly created _PRT entry]
+ })
+
+ Cf. ACPI 6.4 specification:
+ - s6.2.13 "_PRT (PCI Routing Table)"
+ - s6.1.1 "_ADR (Address)"
+
+ @param [in] Address Address. Cf ACPI 6.4 specification, Table 6.2:
+ "ADR Object Address Encodings":
+ High word-Device #, Low word-Function #. (for
+ example, device 3, function 2 is 0x00030002).
+ To refer to all the functions on a device #,
+ use a function number of FFFF).
+ @param [in] Pin PCI pin number of the device (0-INTA ... 3-INTD).
+ Must be between 0-3.
+ @param [in] LinkName Link Name, i.e. device in the AML NameSpace
+ describing the interrupt used.
+ The input string is copied.
+ @param [in] SourceIndex Source index or GSIV.
+ @param [in] PrtNameNode Prt Named node to add the object to ....
+
+ @retval EFI_SUCCESS Success.
+ @retval EFI_INVALID_PARAMETER Invalid parameter.
+ @retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
+**/
+EFI_STATUS
+EFIAPI
+AmlAddPrtEntry (
+ IN UINT32 Address,
+ IN UINT8 Pin,
+ IN CONST CHAR8 *LinkName,
+ IN UINT32 SourceIndex,
+ IN AML_OBJECT_NODE_HANDLE PrtNameNode
+ )
+{
+ EFI_STATUS Status;
+ AML_OBJECT_NODE *PrtEntryList;
+ AML_OBJECT_NODE *PackageNode;
+ AML_OBJECT_NODE *NewElementNode;
+
+ CHAR8 *AmlNameString;
+ UINT32 AmlNameStringSize;
+ AML_DATA_NODE *DataNode;
+
+ if ((Pin > 3) ||
+ (LinkName == NULL) ||
+ (PrtNameNode == NULL) ||
+ (AmlGetNodeType ((AML_NODE_HANDLE)PrtNameNode) != EAmlNodeObject) ||
+ (!AmlNodeHasOpCode (PrtNameNode, AML_NAME_OP, 0)) ||
+ !AmlNameOpCompareName (PrtNameNode, "_PRT"))
+ {
+ ASSERT (0);
+ return EFI_INVALID_PARAMETER;
+ }
+
+ NewElementNode = NULL;
+ AmlNameString = NULL;
+ DataNode = NULL;
+
+ // Get the Package object node of the _PRT node,
+ // which is the 2nd fixed argument (i.e. index 1).
+ PrtEntryList = (AML_OBJECT_NODE_HANDLE)AmlGetFixedArgument (
+ PrtNameNode,
+ EAmlParseIndexTerm1
+ );
+ if ((PrtEntryList == NULL) ||
+ (AmlGetNodeType ((AML_NODE_HANDLE)PrtEntryList) != EAmlNodeObject) ||
+ (!AmlNodeHasOpCode (PrtEntryList, AML_PACKAGE_OP, 0)))
+ {
+ ASSERT (0);
+ return EFI_INVALID_PARAMETER;
+ }
+
+ // The new _PRT entry.
+ Status = AmlCodeGenPackage (&PackageNode);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ return Status;
+ }
+
+ Status = AmlCodeGenInteger (Address, &NewElementNode);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ Status = AmlVarListAddTail (
+ (AML_NODE_HANDLE)PackageNode,
+ (AML_NODE_HANDLE)NewElementNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ NewElementNode = NULL;
+
+ Status = AmlCodeGenInteger (Pin, &NewElementNode);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ Status = AmlVarListAddTail (
+ (AML_NODE_HANDLE)PackageNode,
+ (AML_NODE_HANDLE)NewElementNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ NewElementNode = NULL;
+
+ Status = ConvertAslNameToAmlName (LinkName, &AmlNameString);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ Status = AmlGetNameStringSize (AmlNameString, &AmlNameStringSize);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ Status = AmlCreateDataNode (
+ EAmlNodeDataTypeNameString,
+ (UINT8 *)AmlNameString,
+ AmlNameStringSize,
+ &DataNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ // AmlNameString will be freed before returning.
+
+ Status = AmlVarListAddTail (
+ (AML_NODE_HANDLE)PackageNode,
+ (AML_NODE_HANDLE)DataNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ DataNode = NULL;
+
+ Status = AmlCodeGenInteger (SourceIndex, &NewElementNode);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ Status = AmlVarListAddTail (
+ (AML_NODE_HANDLE)PackageNode,
+ (AML_NODE_HANDLE)NewElementNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ // Append to the the list of _PRT entries.
+ Status = AmlVarListAddTail (
+ (AML_NODE_HANDLE)PrtEntryList,
+ (AML_NODE_HANDLE)PackageNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ // Free AmlNameString before returning as it is copied
+ // in the call to AmlCreateDataNode().
+ goto exit_handler;
+
+error_handler:
+ AmlDeleteTree ((AML_NODE_HANDLE)PackageNode);
+ if (NewElementNode != NULL) {
+ AmlDeleteTree ((AML_NODE_HANDLE)NewElementNode);
+ }
+
+ if (DataNode != NULL) {
+ AmlDeleteTree ((AML_NODE_HANDLE)DataNode);
+ }
+
+exit_handler:
+ if (AmlNameString != NULL) {
+ FreePool (AmlNameString);
+ }
+
+ return Status;
+}
+
/** AML code generation for a Device object node.
AmlCodeGenDevice ("COM0", ParentNode, NewObjectNode) is
--
2.25.1
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