drivers: Implement EFI_PEI_MP_SERVICES_PPI with FSP_UNSUPPORTED type

This patch implements EFI_PEI_MP_SERVICES_PPI structure definitions
with APIs that return mp_api_unsupported().

The reason behind this change is to fix an FSP issue where FSP assumes
ownership of the APs (Application Processors) upon passing a `NULL`
pointer to the CpuMpPpi FSP-S UPD.Hence, this patch implements
`MP_SERVICES_PPI_DEFAULT` config to fill EFI_PEI_MP_SERVICES_PPI with
`mp_api_unsupported` APIs.

Later this data structure can be passed to the CpuMpPpi UPD to avoid
APs from getting hijacked by FSP while coreboot decides to set
SkipMpInit UPD.

TEST=Able to build and boot Google/Taeko with this patch.

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I31fcaa2aa633071b6d6bfa05dbe891ef87978d2c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66708
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/drivers/intel/fsp2_0/ppi/Kconfig

@@ -26,3 +26,11 @@ config MP_SERVICES_PPI_V2
 	  modification over MP services1 PPIs. A new API StartupAllCPUs have been
 	  added to allow running a task on BSP and all APs. Also the EFI_PEI_SERVICES
 	  parameter has been removed from all MP PPI APIs.
+
+config MP_SERVICES_PPI_V2_NOOP
+	bool
+	default n
+	select MP_SERVICES_PPI
+	help
+	  This option implement EFI_PEI_MP_SERVICES_PPI structure definitions
+	  with APIs that returns mp_api_unsupported().

src/drivers/intel/fsp2_0/ppi/Makefile.inc

@@ -3,3 +3,4 @@
 ramstage-$(CONFIG_MP_SERVICES_PPI) += mp_service_ppi.c
 ramstage-$(CONFIG_MP_SERVICES_PPI_V1) += mp_service1.c
 ramstage-$(CONFIG_MP_SERVICES_PPI_V2) += mp_service2.c
+ramstage-$(CONFIG_MP_SERVICES_PPI_V2_NOOP) += mp_service2_noop.c

src/drivers/intel/fsp2_0/ppi/mp_service2_noop.c

@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <fsp/api.h>
+#include <fsp/ppi/mp_service_ppi.h>
+#include <Ppi/MpServices2.h>
+
+typedef EDKII_PEI_MP_SERVICES2_PPI efi_pei_mp_services_ppi;
+
+static efi_return_status_t mps2_noop_get_number_of_processors(
+	efi_pei_mp_services_ppi *ignored1,
+	efi_uintn_t *ignored2,
+	efi_uintn_t *ignored3)
+{
+	return mp_api_unsupported();
+}
+
+static efi_return_status_t mps2_noop_get_processor_info(
+	efi_pei_mp_services_ppi *ignored1,
+	efi_uintn_t ignored2,
+	efi_processor_information *ignored3)
+{
+	return mp_api_unsupported();
+}
+
+static efi_return_status_t mps2_noop_startup_all_aps(
+	efi_pei_mp_services_ppi *ignored1,
+	efi_ap_procedure ignored2, efi_boolean_t ignored3,
+	efi_uintn_t ignored4, void *ignored5)
+{
+	return mp_api_unsupported();
+}
+
+static efi_return_status_t mps2_noop_startup_all_cpus(
+	efi_pei_mp_services_ppi *ignored1,
+	efi_ap_procedure ignored2,
+	efi_uintn_t ignored3, void *ignored4)
+{
+	return mp_api_unsupported();
+}
+
+static efi_return_status_t mps2_noop_startup_this_ap(
+	efi_pei_mp_services_ppi *ignored1,
+	efi_ap_procedure ignored2, efi_uintn_t ignored3,
+	efi_uintn_t ignored4, void *ignored5)
+{
+	return mp_api_unsupported();
+}
+
+static efi_return_status_t mps2_noop_switch_bsp(
+	efi_pei_mp_services_ppi *ignored1, efi_uintn_t ignored2,
+	efi_boolean_t ignored3)
+{
+	return mp_api_unsupported();
+}
+
+static efi_return_status_t mps2_noop_enable_disable_ap(
+	efi_pei_mp_services_ppi *ignored1,
+	efi_uintn_t ignored2, efi_boolean_t ignored3, efi_uint32_t *ignored4)
+{
+	return mp_api_unsupported();
+}
+
+static efi_return_status_t mps2_noop_identify_processor(
+	efi_pei_mp_services_ppi *ignored1,
+	efi_uintn_t *ignored2)
+{
+	return mp_api_unsupported();
+}
+
+/*
+ * Default MP Services data structure adhering to the EDK2 UEFIPKG Open
+ * Source version 2 specification
+ */
+
+static efi_pei_mp_services_ppi mp_service2_noop_ppi = {
+	mps2_noop_get_number_of_processors,
+	mps2_noop_get_processor_info,
+	mps2_noop_startup_all_aps,
+	mps2_noop_startup_this_ap,
+	mps2_noop_switch_bsp,
+	mps2_noop_enable_disable_ap,
+	mps2_noop_identify_processor,
+	mps2_noop_startup_all_cpus,
+};
+
+void *mp_fill_ppi_services_data(void)
+{
+	return (void *)&mp_service2_noop_ppi;
+}