DynamicTablesPkg: AcpiSsdtPcieLibArm: Create support library
Add support library to allow for customization of _OSC and slot info. The functions in the library are unchanged, with the exception of adding PciInfo pointer to the APIs. Signed-off-by: Jeff Brasen <jbrasen@nvidia.com> Reviewed-by: Pierre Gondois <pierre.gondois@arm.com> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
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Jeff Brasen
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/** @file
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SSDT PCIe Support Library.
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Copyright (c) 2021 - 2022, Arm Limited. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Reference(s):
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- PCI Firmware Specification - Revision 3.0
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- ACPI 6.4 specification:
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- s6.2.13 "_PRT (PCI Routing Table)"
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- s6.1.1 "_ADR (Address)"
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- linux kernel code
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- Arm Base Boot Requirements v1.0
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- Arm Base System Architecture v1.0
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**/
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#include <Library/AcpiLib.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Protocol/AcpiTable.h>
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// Module specific include files.
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#include <AcpiTableGenerator.h>
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#include <ConfigurationManagerObject.h>
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#include <ConfigurationManagerHelper.h>
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#include <Library/AcpiHelperLib.h>
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#include <Library/TableHelperLib.h>
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#include <Library/AmlLib/AmlLib.h>
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#include <Library/SsdtPcieSupportLib.h>
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#include <Protocol/ConfigurationManagerProtocol.h>
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#include "SsdtPcieSupportLibPrivate.h"
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/** Generate Pci slots devices.
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PCI Firmware Specification - Revision 3.3,
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s4.8 "Generic ACPI PCI Slot Description" requests to describe the PCI slot
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used. It should be possible to enumerate them, but this is additional
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information.
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@param [in] PciInfo Pci device information.
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@param [in] MappingTable The mapping table structure.
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@param [in, out] PciNode Pci node to amend.
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@retval EFI_SUCCESS Success.
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@retval EFI_INVALID_PARAMETER Invalid parameter.
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@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
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**/
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EFI_STATUS
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EFIAPI
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GeneratePciSlots (
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IN CONST CM_ARM_PCI_CONFIG_SPACE_INFO *PciInfo,
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IN CONST MAPPING_TABLE *MappingTable,
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IN OUT AML_OBJECT_NODE_HANDLE PciNode
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)
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{
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EFI_STATUS Status;
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UINT32 Index;
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UINT32 LastIndex;
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UINT32 DeviceId;
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CHAR8 AslName[AML_NAME_SEG_SIZE + 1];
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AML_OBJECT_NODE_HANDLE DeviceNode;
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ASSERT (MappingTable != NULL);
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ASSERT (PciNode != NULL);
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// Generic device name is "Dxx".
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CopyMem (AslName, "Dxx_", AML_NAME_SEG_SIZE + 1);
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LastIndex = MappingTable->LastIndex;
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// There are at most 32 devices on a Pci bus.
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if (LastIndex >= 32) {
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ASSERT (0);
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return EFI_INVALID_PARAMETER;
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}
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for (Index = 0; Index < LastIndex; Index++) {
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DeviceId = MappingTable->Table[Index];
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AslName[AML_NAME_SEG_SIZE - 3] = AsciiFromHex (DeviceId & 0xF);
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AslName[AML_NAME_SEG_SIZE - 2] = AsciiFromHex ((DeviceId >> 4) & 0xF);
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// ASL:
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// Device (Dxx) {
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// Name (_ADR, <address value>)
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// }
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Status = AmlCodeGenDevice (AslName, PciNode, &DeviceNode);
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if (EFI_ERROR (Status)) {
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ASSERT (0);
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return Status;
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}
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/* ACPI 6.4 specification, Table 6.2: "ADR Object Address Encodings"
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High word-Device #, Low word-Function #. (for example, device 3,
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function 2 is 0x00030002). To refer to all the functions on a device #,
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use a function number of FFFF).
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*/
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Status = AmlCodeGenNameInteger (
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"_ADR",
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(DeviceId << 16) | 0xFFFF,
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DeviceNode,
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NULL
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);
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if (EFI_ERROR (Status)) {
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ASSERT (0);
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return Status;
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}
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// _SUN object is not generated as we don't know which slot will be used.
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}
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return Status;
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}
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/** Add an _OSC template method to the PciNode.
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The _OSC method is provided as an AML blob. The blob is
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parsed and attached at the end of the PciNode list of variable elements.
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@param [in] PciInfo Pci device information.
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@param [in, out] PciNode Pci node to amend.
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@retval EFI_SUCCESS The function completed successfully.
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@retval EFI_INVALID_PARAMETER Invalid parameter.
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@retval EFI_OUT_OF_RESOURCES Could not allocate memory.
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**/
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EFI_STATUS
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EFIAPI
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AddOscMethod (
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IN CONST CM_ARM_PCI_CONFIG_SPACE_INFO *PciInfo,
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IN OUT AML_OBJECT_NODE_HANDLE PciNode
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)
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{
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EFI_STATUS Status;
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EFI_STATUS Status1;
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EFI_ACPI_DESCRIPTION_HEADER *SsdtPcieOscTemplate;
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AML_ROOT_NODE_HANDLE OscTemplateRoot;
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AML_OBJECT_NODE_HANDLE OscNode;
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ASSERT (PciNode != NULL);
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// Parse the Ssdt Pci Osc Template.
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SsdtPcieOscTemplate = (EFI_ACPI_DESCRIPTION_HEADER *)
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ssdtpcieosctemplate_aml_code;
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OscNode = NULL;
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OscTemplateRoot = NULL;
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Status = AmlParseDefinitionBlock (
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SsdtPcieOscTemplate,
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&OscTemplateRoot
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);
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if (EFI_ERROR (Status)) {
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DEBUG ((
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DEBUG_ERROR,
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"ERROR: SSDT-PCI-OSC: Failed to parse SSDT PCI OSC Template."
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" Status = %r\n",
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Status
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));
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return Status;
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}
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Status = AmlFindNode (OscTemplateRoot, "\\_OSC", &OscNode);
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if (EFI_ERROR (Status)) {
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goto error_handler;
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}
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Status = AmlDetachNode (OscNode);
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if (EFI_ERROR (Status)) {
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goto error_handler;
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}
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Status = AmlAttachNode (PciNode, OscNode);
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if (EFI_ERROR (Status)) {
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// Free the detached node.
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AmlDeleteTree (OscNode);
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goto error_handler;
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}
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error_handler:
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// Cleanup
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Status1 = AmlDeleteTree (OscTemplateRoot);
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if (EFI_ERROR (Status1)) {
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DEBUG ((
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DEBUG_ERROR,
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"ERROR: SSDT-PCI-OSC: Failed to cleanup AML tree."
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" Status = %r\n",
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Status1
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));
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// If Status was success but we failed to delete the AML Tree
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// return Status1 else return the original error code, i.e. Status.
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if (!EFI_ERROR (Status)) {
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return Status1;
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}
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}
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return Status;
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}
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