[edk2-staging][PATCH 13/15] edk2-staging/RedfishClientPkg: Introduce Computer System collection driver

["Nickle Wang" <nickle.wang@hpe.com>]

Introduce new feature driver to support Computer System Collection
schema. Update corresponding FDF and DSC file to enable this feature
driver.

Signed-off-by: Nickle Wang <nickle.wang@hpe.com>
Cc: Abner Chang <abner.chang@amd.com>
Cc: Yang Atom <Atom.Yang@amd.com>
Cc: Nick Ramirez <nramirez@nvidia.com>
---
 .../ComputerSystemCollectionDxe.c             | 667 ++++++++++++++++++
 .../ComputerSystemCollectionDxe.h             |  21 +
 .../ComputerSystemCollectionDxe.inf           |  56 ++
 RedfishClientPkg/RedfishClient.fdf.inc        |   2 +
 .../RedfishClientComponents.dsc.inc           |   2 +
 RedfishClientPkg/RedfishClientLibs.dsc.inc    |   1 +
 6 files changed, 749 insertions(+)
 create mode 100644 RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.c
 create mode 100644 RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.h
 create mode 100644 RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.inf

diff --git a/RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.c b/RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.c
new file mode 100644
index 0000000000..dbf5ab3395
--- /dev/null
+++ b/RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.c
@@ -0,0 +1,667 @@
+/** @file
+
+  Redfish feature driver implementation - ComputerSystemCollection
+
+  (C) Copyright 2020-2022 Hewlett Packard Enterprise Development LP<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "ComputerSystemCollectionDxe.h"
+
+REDFISH_COLLECTION_PRIVATE *mRedfishCollectionPrivate = NULL;
+
+EFI_STATUS
+HandleResource (
+  IN  REDFISH_COLLECTION_PRIVATE *Private,
+  IN  EFI_STRING                 Uri
+  )
+{
+  EFI_STATUS                              Status;
+  REDFISH_SCHEMA_INFO                     SchemaInfo;
+  EFI_STRING                              ConfigLang;
+  EFI_STRING                              ReturnedConfigLang;
+  UINTN                                   Index;
+
+  if (Private == NULL || IS_EMPTY_STRING (Uri)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // Resource match
+  //
+
+  DEBUG ((REDFISH_DEBUG_TRACE, "%a, process resource for: %s\n", __FUNCTION__, Uri));
+
+  Status = GetRedfishSchemaInfo (Private->RedfishService, Private->JsonStructProtocol, Uri, &SchemaInfo);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a, failed to get schema information from: %s %r\n", __FUNCTION__, Uri, Status));
+    return Status;
+  }
+  //
+  // Check and see if this is target resource that we want to handle.
+  // Some resource is handled by other provider so we have to make sure this first.
+  //
+  DEBUG ((REDFISH_DEBUG_TRACE, "%s Identify for %s\n", __FUNCTION__, Uri));
+  ConfigLang = RedfishGetConfigLanguage (Uri);
+  if (ConfigLang == NULL) {
+    Status = EdkIIRedfishResourceConfigIdentify (&SchemaInfo, Uri, Private->InformationExchange);
+    if (EFI_ERROR (Status)) {
+      if (Status == EFI_UNSUPPORTED) {
+        DEBUG ((DEBUG_INFO, "%a, \"%s\" is not handled by us\n", __FUNCTION__, Uri));
+        return EFI_SUCCESS;
+      }
+
+      DEBUG ((DEBUG_ERROR, "%a, fail to identify resource: \"%s\": %r\n", __FUNCTION__, Uri, Status));
+      return Status;
+    }
+  } else {
+    DEBUG ((REDFISH_DEBUG_TRACE, "%a, history record found: %s\n", __FUNCTION__, ConfigLang));
+    //
+    // Set exchange information
+    //
+    Status = GetArrayIndexFromArrayTypeConfigureLang (ConfigLang, &ReturnedConfigLang, &Index);
+    if (!EFI_ERROR (Status) || Status == EFI_NOT_FOUND) {
+      Private->InformationExchange->ReturnedInformation.Type = InformationTypeCollectionMemberConfigLanguage;
+      Private->InformationExchange->ReturnedInformation.ConfigureLanguageList.Count = 1;
+      Private->InformationExchange->ReturnedInformation.ConfigureLanguageList.List =
+        AllocateZeroPool(sizeof (REDFISH_FEATURE_ARRAY_TYPE_CONFIG_LANG));
+
+      if (Private->InformationExchange->ReturnedInformation.ConfigureLanguageList.List == NULL) {
+        DEBUG ((DEBUG_ERROR, "%a, Fail to allocate memory for REDFISH_FEATURE_ARRAY_TYPE_CONFIG_LANG.\n", __FUNCTION__));
+        return EFI_OUT_OF_RESOURCES;
+      }
+      Private->InformationExchange->ReturnedInformation.ConfigureLanguageList.List [0].Index = Index;
+      Private->InformationExchange->ReturnedInformation.ConfigureLanguageList.List [0].ConfigureLang =
+          (EFI_STRING)AllocateCopyPool(StrSize(ReturnedConfigLang), (VOID *)ReturnedConfigLang);
+    } else {
+      DEBUG ((DEBUG_ERROR, "%a, GetArrayIndexFromArrayTypeConfigureLang fail: %r\n", __FUNCTION__, Status));
+    }
+    FreePool (ConfigLang);
+  }
+
+  //
+  // Check and see if target property exist or not even when collection memeber exists.
+  // If not, we sill do provision.
+  //
+  DEBUG ((REDFISH_DEBUG_TRACE, "%a Check for %s\n", __FUNCTION__, Uri));
+  Status = EdkIIRedfishResourceConfigCheck (&SchemaInfo, Uri);
+  if (EFI_ERROR (Status)) {
+    //
+    // The target property does not exist, do the provision to create property.
+    //
+    DEBUG ((REDFISH_DEBUG_TRACE, "%a provision for %s\n", __FUNCTION__, Uri));
+    Status = EdkIIRedfishResourceConfigProvisionging (&SchemaInfo, Uri, Private->InformationExchange, FALSE);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((DEBUG_ERROR, "%a, failed to provision with GET mode: %r\n", __FUNCTION__, Status));
+    }
+
+    return Status;
+  }
+
+  //
+  // Consume first.
+  //
+  DEBUG ((REDFISH_DEBUG_TRACE, "%a consume for %s\n", __FUNCTION__, Uri));
+  Status = EdkIIRedfishResourceConfigConsume (&SchemaInfo, Uri);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a, failed to consume resoruce for: %s: %r\n", __FUNCTION__, Uri, Status));
+  }
+
+  //
+  // Patch.
+  //
+  DEBUG ((REDFISH_DEBUG_TRACE, "%a update for %s\n", __FUNCTION__, Uri));
+  Status = EdkIIRedfishResourceConfigUpdate (&SchemaInfo, Uri);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a, failed to update resoruce for: %s: %r\n", __FUNCTION__, Uri, Status));
+  }
+
+  return Status;
+}
+
+EFI_STATUS
+HandleCollectionResource (
+  IN  REDFISH_COLLECTION_PRIVATE  *Private
+  )
+{
+  EFI_STATUS                              Status;
+  EFI_REDFISH_COMPUTERSYSTEMCOLLECTION            *Collection;
+  EFI_REDFISH_COMPUTERSYSTEMCOLLECTION_CS         *CollectionCs;
+  RedfishCS_Link                          *List;
+  RedfishCS_Header                        *Header;
+  RedfishCS_Type_Uri_Data                 *UriData;
+  EFI_STRING                              MemberUri;
+
+  if (Private == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (Private->JsonStructProtocol == NULL || Private->CollectionJson == NULL) {
+    return EFI_NOT_READY;
+  }
+
+  DEBUG ((REDFISH_DEBUG_TRACE, "%a, process collection for: %s\n", __FUNCTION__, Private->CollectionUri));
+
+  //
+  // Convert JSON text to C structure.
+  //
+  Status = Private->JsonStructProtocol->ToStructure (
+                                          Private->JsonStructProtocol,
+                                          NULL,
+                                          Private->CollectionJson,
+                                          (EFI_REST_JSON_STRUCTURE_HEADER **)&Collection
+                                          );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a, ToStructure() failed: %r\n", __FUNCTION__, Status));
+    return Status;
+  }
+
+  CollectionCs = Collection->ComputerSystemCollection;
+
+  if (*CollectionCs->Membersodata_count == 0) {
+    return EFI_NOT_FOUND;
+  }
+
+  if (IsLinkEmpty (&CollectionCs->Members)) {
+    return EFI_NOT_FOUND;
+  }
+
+  List = GetFirstLink (&CollectionCs->Members);
+  while (TRUE) {
+
+    Header = (RedfishCS_Header *)List;
+    if (Header->ResourceType == RedfishCS_Type_Uri) {
+      UriData = (RedfishCS_Type_Uri_Data *)Header;
+      MemberUri = NULL;
+      MemberUri = StrAsciiToUnicode (UriData->Uri);
+      ASSERT (MemberUri != NULL);
+      if (MemberUri != NULL) {
+        Status = HandleResource (Private, MemberUri);
+        if (EFI_ERROR (Status)) {
+          DEBUG ((DEBUG_ERROR, "%a, process ComputerSystemCollection resource: %a failed: %r\n", __FUNCTION__, UriData->Uri, Status));
+        }
+
+        FreePool (MemberUri);
+      }
+    }
+
+    if (IsLinkAtEnd (&CollectionCs->Members, List)) {
+      break;
+    }
+
+    List = GetNextLink (&CollectionCs->Members, List);
+  }
+
+  //
+  // Release resource.
+  //
+  Private->JsonStructProtocol->DestoryStructure (Private->JsonStructProtocol, (EFI_REST_JSON_STRUCTURE_HEADER *)Collection);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+CreateCollectionResource (
+  IN  REDFISH_COLLECTION_PRIVATE           *Private
+  )
+{
+  EFI_STATUS                            Status;
+  REDFISH_SCHEMA_INFO                   SchemaInfo;
+
+  if (Private == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  DEBUG ((REDFISH_DEBUG_TRACE, "%a, create resource for collection for: %s\n", __FUNCTION__, Private->CollectionUri));
+
+  Status = GetSupportedSchemaVersion (REDFISH_SCHEMA_NAME, &SchemaInfo);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a, failed to find supported schema from HII database: %r\n", __FUNCTION__, Status));
+    return Status;
+  }
+
+  DEBUG ((REDFISH_DEBUG_TRACE, "%a, supported schema: %a %a.%a.%a\n", __FUNCTION__, SchemaInfo.Schema, SchemaInfo.Major, SchemaInfo.Minor, SchemaInfo.Errata));
+
+  Status = EdkIIRedfishResourceConfigProvisionging (&SchemaInfo, Private->CollectionUri, Private->InformationExchange, TRUE);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a, failed to create resoruce for: %s: %r\n", __FUNCTION__, Private->CollectionUri, Status));
+  }
+
+  return Status;
+}
+
+EFI_STATUS
+ReleaseCollectionResource (
+  IN REDFISH_COLLECTION_PRIVATE *Private
+  )
+{
+
+  if (Private == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // Release resource
+  //
+  if (Private->RedResponse.Payload != NULL) {
+    RedfishFreeResponse (
+      Private->RedResponse.StatusCode,
+      Private->RedResponse.HeaderCount,
+      Private->RedResponse.Headers,
+      Private->RedResponse.Payload
+      );
+    Private->RedResponse.StatusCode = NULL;
+    Private->RedResponse.HeaderCount = 0;
+    Private->RedResponse.Headers = NULL;
+    Private->RedResponse.Payload = NULL;
+  }
+
+  if (Private->CollectionJson != NULL) {
+    FreePool (Private->CollectionJson);
+    Private->CollectionJson = NULL;
+  }
+
+  if (Private->RedfishVersion != NULL) {
+    FreePool (Private->RedfishVersion);
+    Private->RedfishVersion = NULL;
+  }
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+CollectionHandler (
+  IN REDFISH_COLLECTION_PRIVATE *Private
+  )
+{
+  EFI_STATUS  Status;
+
+  if (Private == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  DEBUG ((REDFISH_DEBUG_TRACE, "%a, collection handler for %s\n", __FUNCTION__, Private->CollectionUri));
+
+  //
+  // Query collection from Redfish service.
+  //
+  Status = GetResourceByUri (Private->RedfishService, Private->CollectionUri, &Private->RedResponse);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a, unable to get resource from: %s :%r\n", __FUNCTION__, Private->CollectionUri, Status));
+    goto ON_RELEASE;
+  }
+
+  Private->CollectionPayload = Private->RedResponse.Payload;
+  ASSERT (Private->CollectionPayload != NULL);
+
+  Private->CollectionJson = JsonDumpString (RedfishJsonInPayload (Private->CollectionPayload), EDKII_JSON_COMPACT);
+  ASSERT (Private->CollectionJson != NULL);
+
+  Status = HandleCollectionResource (Private);
+  if (EFI_ERROR (Status) && Status == EFI_NOT_FOUND) {
+    Status = CreateCollectionResource (Private);
+  }
+
+ON_RELEASE:
+
+  ReleaseCollectionResource (Private);
+
+  return Status;
+}
+
+/**
+  The callback function provided by Redfish Feature driver.
+
+  @param[in]     This                Pointer to EDKII_REDFISH_FEATURE_PROTOCOL instance.
+  @param[in]     FeatureAction       The action Redfish feature driver should take.
+  @param[in]     Uri                 The collection URI.
+  @param[in]     Context             The context of Redfish feature driver.
+  @param[in,out] InformationExchange The pointer to RESOURCE_INFORMATION_EXCHANGE
+
+  @retval EFI_SUCCESS              Redfish feature driver callback is executed successfully.
+  @retval Others                   Some errors happened.
+
+  @retval EFI_SUCCESS              Redfish feature driver callback is executed successfully.
+  @retval Others                   Some errors happened.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishCollectionFeatureCallback (
+  IN     EDKII_REDFISH_FEATURE_PROTOCOL *This,
+  IN     FEATURE_CALLBACK_ACTION        FeatureAction,
+  IN     VOID                           *Context,
+  IN OUT RESOURCE_INFORMATION_EXCHANGE  *InformationExchange
+  )
+{
+  EFI_STATUS                   Status;
+  REDFISH_SERVICE              RedfishService;
+  REDFISH_COLLECTION_PRIVATE   *Private;
+  EFI_STRING                   ResourceUri;
+
+  if (FeatureAction != CallbackActionStartOperation) {
+    return EFI_UNSUPPORTED;
+  }
+
+  Private = (REDFISH_COLLECTION_PRIVATE *)Context;
+
+  RedfishService = Private->RedfishService;
+  if (RedfishService == NULL) {
+    return EFI_NOT_READY;
+  }
+
+  //
+  // Save in private structure.
+  //
+  Private->InformationExchange = InformationExchange;
+
+  //
+  // Find Redfish version on BMC
+  //
+  Private->RedfishVersion = RedfishGetVersion (RedfishService);
+
+  //
+  // Create the full URI from Redfish service root.
+  //
+  ResourceUri = (EFI_STRING)AllocateZeroPool (MAX_URI_LENGTH * sizeof(CHAR16));
+  if (ResourceUri == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a, Fail to allocate memory for full URI.\n", __FUNCTION__));
+    return EFI_OUT_OF_RESOURCES;
+  }
+  StrCatS (ResourceUri, MAX_URI_LENGTH, Private->RedfishVersion);
+  StrCatS (ResourceUri, MAX_URI_LENGTH, InformationExchange->SendInformation.FullUri);
+
+  //
+  // Initialize collection path
+  //
+  Private->CollectionUri = RedfishGetUri (ResourceUri);
+  if (Private->CollectionUri == NULL) {
+    ASSERT (FALSE);
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  Status = CollectionHandler (Private);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a, CollectionHandler failure: %r\n", __FUNCTION__, Status));
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Initialize a Redfish configure handler.
+
+  This function will be called by the Redfish config driver to initialize each Redfish configure
+  handler.
+
+  @param[in]   This                     Pointer to EDKII_REDFISH_CONFIG_HANDLER_PROTOCOL instance.
+  @param[in]   RedfishConfigServiceInfo Redfish service informaion.
+
+  @retval EFI_SUCCESS                  The handler has been initialized successfully.
+  @retval EFI_DEVICE_ERROR             Failed to create or configure the REST EX protocol instance.
+  @retval EFI_ALREADY_STARTED          This handler has already been initialized.
+  @retval Other                        Error happens during the initialization.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishCollectionInit (
+  IN  EDKII_REDFISH_CONFIG_HANDLER_PROTOCOL  *This,
+  IN  REDFISH_CONFIG_SERVICE_INFORMATION   *RedfishConfigServiceInfo
+  )
+{
+  REDFISH_COLLECTION_PRIVATE *Private;
+
+  Private = REDFISH_COLLECTION_PRIVATE_DATA_FROM_PROTOCOL (This);
+
+  Private->RedfishService = RedfishCreateService (RedfishConfigServiceInfo);
+  if (Private->RedfishService == NULL) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Stop a Redfish configure handler.
+
+  @param[in]   This                Pointer to EDKII_REDFISH_CONFIG_HANDLER_PROTOCOL instance.
+
+  @retval EFI_SUCCESS              This handler has been stoped successfully.
+  @retval Others                   Some error happened.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishCollectionStop (
+  IN  EDKII_REDFISH_CONFIG_HANDLER_PROTOCOL       *This
+  )
+{
+  REDFISH_COLLECTION_PRIVATE *Private;
+
+  Private = REDFISH_COLLECTION_PRIVATE_DATA_FROM_PROTOCOL (This);
+
+  if (Private->RedfishService != NULL) {
+    RedfishCleanupService (Private->RedfishService);
+    Private->RedfishService = NULL;
+  }
+
+  ReleaseCollectionResource (Private);
+
+  if (Private->FeatureProtocol != NULL) {
+    Private->FeatureProtocol->Unregister (
+                                Private->FeatureProtocol,
+                                REDFISH_MANAGED_URI,
+                                NULL
+                                );
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Callback function when gEfiRestJsonStructureProtocolGuid is installed.
+
+  @param[in] Event    Event whose notification function is being invoked.
+  @param[in] Context  Pointer to the notification function's context.
+**/
+VOID
+EFIAPI
+EfiRestJasonStructureProtocolIsReady
+ (
+  IN  EFI_EVENT                             Event,
+  IN  VOID                                  *Context
+  )
+{
+  EFI_STATUS  Status;
+
+  if (mRedfishCollectionPrivate == NULL) {
+    return;
+  }
+
+  if (mRedfishCollectionPrivate->JsonStructProtocol != NULL) {
+    return;
+  }
+
+  Status = gBS->LocateProtocol (
+                 &gEfiRestJsonStructureProtocolGuid,
+                 NULL,
+                 (VOID **)&mRedfishCollectionPrivate->JsonStructProtocol
+                 );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a, failed to locate gEfiRestJsonStructureProtocolGuid: %r\n", __FUNCTION__, Status));
+  }
+
+  gBS->CloseEvent (Event);
+}
+
+/**
+  Callback function when gEdkIIRedfishFeatureProtocolGuid is installed.
+
+  @param[in] Event    Event whose notification function is being invoked.
+  @param[in] Context  Pointer to the notification function's context.
+**/
+VOID
+EFIAPI
+EdkIIRedfishFeatureProtocolIsReady
+ (
+  IN  EFI_EVENT                             Event,
+  IN  VOID                                  *Context
+  )
+{
+  EFI_STATUS                      Status;
+  EDKII_REDFISH_FEATURE_PROTOCOL  *FeatureProtocol;
+
+  if (mRedfishCollectionPrivate == NULL) {
+    return;
+  }
+
+  if (mRedfishCollectionPrivate->FeatureProtocol != NULL) {
+    return;
+  }
+
+  Status = gBS->LocateProtocol (
+                 &gEdkIIRedfishFeatureProtocolGuid,
+                 NULL,
+                 (VOID **)&FeatureProtocol
+                 );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a, failed to locate gEdkIIRedfishFeatureProtocolGuid: %r\n", __FUNCTION__, Status));
+    gBS->CloseEvent (Event);
+    return;
+  }
+
+  Status = FeatureProtocol->Register (
+                              FeatureProtocol,
+                              REDFISH_MANAGED_URI,
+                              RedfishCollectionFeatureCallback,
+                              (VOID *)mRedfishCollectionPrivate
+                              );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a, failed to register %s: %r\n", __FUNCTION__, REDFISH_MANAGED_URI, Status));
+  }
+
+  mRedfishCollectionPrivate->FeatureProtocol = FeatureProtocol;
+
+  gBS->CloseEvent (Event);
+}
+
+/**
+  Unloads an image.
+
+  @param  ImageHandle           Handle that identifies the image to be unloaded.
+
+  @retval EFI_SUCCESS           The image has been unloaded.
+  @retval EFI_INVALID_PARAMETER ImageHandle is not a valid image handle.
+
+**/
+EFI_STATUS
+EFIAPI
+RedfishCollectionUnload (
+  IN EFI_HANDLE  ImageHandle
+  )
+{
+  EFI_STATUS                             Status;
+  EDKII_REDFISH_CONFIG_HANDLER_PROTOCOL  *ConfigHandler;
+
+  if (mRedfishCollectionPrivate == NULL) {
+    return EFI_NOT_READY;
+  }
+
+  ConfigHandler = NULL;
+
+  //
+  // Firstly, find ConfigHandler Protocol interface in this ImageHandle.
+  //
+  Status = gBS->OpenProtocol (
+                  ImageHandle,
+                  &gEdkIIRedfishConfigHandlerProtocolGuid,
+                  (VOID **) &ConfigHandler,
+                  NULL,
+                  NULL,
+                  EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL
+                  );
+  if (EFI_ERROR (Status) || ConfigHandler == NULL) {
+    return Status;
+  }
+
+  ConfigHandler->Stop (ConfigHandler);
+
+  //
+  // Last, uninstall ConfigHandler Protocol.
+  //
+  Status = gBS->UninstallMultipleProtocolInterfaces (
+                  ImageHandle,
+                  &gEdkIIRedfishConfigHandlerProtocolGuid,
+                  ConfigHandler,
+                  NULL
+                  );
+
+  FreePool (mRedfishCollectionPrivate);
+  mRedfishCollectionPrivate = NULL;
+
+  return Status;
+}
+
+EDKII_REDFISH_CONFIG_HANDLER_PROTOCOL mRedfishConfigHandler = {
+  RedfishCollectionInit,
+  RedfishCollectionStop
+};
+
+/**
+  This is the declaration of an EFI image entry point. This entry point is
+  the same for UEFI Applications, UEFI OS Loaders, and UEFI Drivers including
+  both device drivers and bus drivers. It initialize the global variables and
+  publish the driver binding protocol.
+
+  @param[in]   ImageHandle      The firmware allocated handle for the UEFI image.
+  @param[in]   SystemTable      A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS           The operation completed successfully.
+  @retval EFI_ACCESS_DENIED     EFI_ISCSI_INITIATOR_NAME_PROTOCOL was installed unexpectedly.
+  @retval Others                Other errors as indicated.
+**/
+EFI_STATUS
+EFIAPI
+RedfishCollectionEntryPoint (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS               Status;
+  VOID                     *Registration;
+
+  if (mRedfishCollectionPrivate != NULL) {
+    return EFI_ALREADY_STARTED;
+  }
+
+  mRedfishCollectionPrivate = AllocateZeroPool (sizeof (REDFISH_COLLECTION_PRIVATE));
+  CopyMem (&mRedfishCollectionPrivate->ConfigHandler, &mRedfishConfigHandler, sizeof (EDKII_REDFISH_CONFIG_HANDLER_PROTOCOL));
+
+  Status = gBS->InstallProtocolInterface (
+                  &ImageHandle,
+                  &gEdkIIRedfishConfigHandlerProtocolGuid,
+                  EFI_NATIVE_INTERFACE,
+                  &mRedfishCollectionPrivate->ConfigHandler
+                  );
+
+  EfiCreateProtocolNotifyEvent (
+    &gEfiRestJsonStructureProtocolGuid,
+    TPL_CALLBACK,
+    EfiRestJasonStructureProtocolIsReady,
+    NULL,
+    &Registration
+    );
+
+  EfiCreateProtocolNotifyEvent (
+    &gEdkIIRedfishFeatureProtocolGuid,
+    TPL_CALLBACK,
+    EdkIIRedfishFeatureProtocolIsReady,
+    NULL,
+    &Registration
+    );
+
+  return Status;
+}
diff --git a/RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.h b/RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.h
new file mode 100644
index 0000000000..a4778c1012
--- /dev/null
+++ b/RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.h
@@ -0,0 +1,21 @@
+/** @file
+
+  Redfish feature driver implementation - internal header file
+
+  (C) Copyright 2020-2022 Hewlett Packard Enterprise Development LP<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef EFI_REDFISH_COMPUTERSYSTEM_COLLECTION_H_
+#define EFI_REDFISH_COMPUTERSYSTEM_COLLECTION_H_
+
+#include <RedfishJsonStructure/ComputerSystemCollection/EfiComputerSystemCollection.h>
+#include <RedfishCollectionCommon.h>
+
+#define REDFISH_SCHEMA_NAME             "ComputerSystem"
+#define REDFISH_MANAGED_URI             L"Systems/{}"
+#define MAX_URI_LENGTH                  256
+
+#endif
diff --git a/RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.inf b/RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.inf
new file mode 100644
index 0000000000..107d6c0769
--- /dev/null
+++ b/RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.inf
@@ -0,0 +1,56 @@
+## @file
+#
+#  Redfish ComputerSystemCollection collection driver.
+#
+#  (C) Copyright 2020-2022 Hewlett Packard Enterprise Development LP<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+
+[Defines]
+  INF_VERSION               = 0x00010005
+  BASE_NAME                 = ComputerSystemCollectionDxe
+  FILE_GUID                 = df883f2e-9f58-4514-9cc9-06cbe6f63073
+  MODULE_TYPE               = DXE_DRIVER
+  VERSION_STRING            = 1.0
+  ENTRY_POINT               = RedfishCollectionEntryPoint
+  UNLOAD_IMAGE              = RedfishCollectionUnload
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  RedfishPkg/RedfishPkg.dec
+  RedfishClientPkg/RedfishClientPkg.dec
+
+[Sources]
+  ComputerSystemCollectionDxe.h
+  ComputerSystemCollectionDxe.c
+
+[LibraryClasses]
+  DebugLib
+  BaseMemoryLib
+  ConverterCommonLib
+  MemoryAllocationLib
+  RedfishFeatureUtilityLib
+  RedfishLib
+  UefiLib
+  UefiDriverEntryPoint
+  UefiBootServicesTableLib
+  EdkIIRedfishResourceConfigLib
+  RedfishVersionLib
+
+[Protocols]
+  gEdkIIRedfishConfigHandlerProtocolGuid    ## CONSUMED
+  gEfiRestJsonStructureProtocolGuid         ## CONSUMED
+  gEdkIIRedfishFeatureProtocolGuid          ## CONSUMED
+
+[Guids]
+
+[Pcd]
+  gEfiRedfishClientPkgTokenSpaceGuid.PcdMaxRedfishSchemaStringSize
+  gEfiRedfishClientPkgTokenSpaceGuid.PcdMaxRedfishSchemaVersionSize
+
+[Depex]
+  TRUE
diff --git a/RedfishClientPkg/RedfishClient.fdf.inc b/RedfishClientPkg/RedfishClient.fdf.inc
index 5c4b9670b0..7d5de56591 100644
--- a/RedfishClientPkg/RedfishClient.fdf.inc
+++ b/RedfishClientPkg/RedfishClient.fdf.inc
@@ -16,6 +16,7 @@
   INF RedfishClientPkg/RedfishConfigLangMapDxe/RedfishConfigLangMapDxe.inf
   INF RedfishClientPkg/Features/Memory/V1_7_1/Dxe/MemoryDxe.inf
   INF RedfishClientPkg/Features/MemoryCollectionDxe/MemoryCollectionDxe.inf
+  INF RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.inf
 
   !include RedfishClientPkg/RedfishJsonStructureDxe.fdf.inc
   #
@@ -23,4 +24,5 @@
   #
   INF RedfishClientPkg/Converter/Memory/v1_7_1/RedfishMemory_V1_7_1_Dxe.inf
   INF RedfishClientPkg/Converter/MemoryCollection/RedfishMemoryCollection_Dxe.inf
+  INF RedfishClientPkg/Converter/ComputerSystemCollection/RedfishComputerSystemCollection_Dxe.inf
 !endif
diff --git a/RedfishClientPkg/RedfishClientComponents.dsc.inc b/RedfishClientPkg/RedfishClientComponents.dsc.inc
index 031d87558e..d4a33385f6 100644
--- a/RedfishClientPkg/RedfishClientComponents.dsc.inc
+++ b/RedfishClientPkg/RedfishClientComponents.dsc.inc
@@ -21,6 +21,7 @@
   #
   RedfishClientPkg/Features/Memory/V1_7_1/Dxe/MemoryDxe.inf
   RedfishClientPkg/Features/MemoryCollectionDxe/MemoryCollectionDxe.inf
+  RedfishClientPkg/Features/ComputerSystemCollectionDxe/ComputerSystemCollectionDxe.inf
 
   !include RedfishClientPkg/RedfishJsonStructureDxe.dsc.inc
 
@@ -30,3 +31,4 @@
   RedfishClientPkg/Converter/Memory/v1_7_1/RedfishMemory_V1_7_1_Dxe.inf
   RedfishClientPkg/Converter/MemoryCollection/RedfishMemoryCollection_Dxe.inf
 !endif
+  RedfishClientPkg/Converter/ComputerSystemCollection/RedfishComputerSystemCollection_Dxe.inf
diff --git a/RedfishClientPkg/RedfishClientLibs.dsc.inc b/RedfishClientPkg/RedfishClientLibs.dsc.inc
index 413b83a732..21595613f5 100644
--- a/RedfishClientPkg/RedfishClientLibs.dsc.inc
+++ b/RedfishClientPkg/RedfishClientLibs.dsc.inc
@@ -19,6 +19,7 @@
   #
   MemoryV1_7_1Lib|RedfishClientPkg/ConverterLib/edk2library/Memory/v1_7_1/Lib.inf
   MemoryCollectionLib|RedfishClientPkg/ConverterLib/edk2library/MemoryCollection/Lib.inf
+  ComputerSystemCollectionLib|RedfishClientPkg/ConverterLib/edk2library/ComputerSystemCollection/Lib.inf
 
   NetLib|NetworkPkg/Library/DxeNetLib/DxeNetLib.inf
   HttpLib|NetworkPkg/Library/DxeHttpLib/DxeHttpLib.inf
-- 
2.32.0.windows.2