crypto/ccp: Implement SEV-TIO PCIe IDE (phase1)

Implement the SEV-TIO (Trusted I/O) firmware interface for PCIe TDISP
(Trust Domain In-Socket Protocol). This enables secure communication
between trusted domains and PCIe devices through the PSP (Platform
Security Processor).

The implementation includes:
- Device Security Manager (DSM) operations for establishing secure links
- SPDM (Security Protocol and Data Model) over DOE (Data Object Exchange)
- IDE (Integrity Data Encryption) stream management for secure PCIe

This module bridges the SEV firmware stack with the generic PCIe TSM
framework.

This is phase1 as described in Documentation/driver-api/pci/tsm.rst.

On AMD SEV, the AMD PSP firmware acts as TSM (manages the security/trust).
The CCP driver provides the interface to it and registers in the TSM
subsystem.

Detect the PSP support (reported via FEATURE_INFO + SNP_PLATFORM_STATUS)
and enable SEV-TIO in the SNP_INIT_EX call if the hardware supports TIO.

Implement SEV TIO PSP command wrappers in sev-dev-tio.c and store
the data in the SEV-TIO-specific structs.

Implement TSM hooks and IDE setup in sev-dev-tsm.c.

Signed-off-by: Alexey Kardashevskiy <aik@amd.com>
Link: https://patch.msgid.link/692f506bb80c9_261c11004@dwillia2-mobl4.notmuch
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Author: aik

drivers/crypto/ccp/Kconfig

@@ -39,6 +39,7 @@ config CRYPTO_DEV_SP_PSP
 	bool "Platform Security Processor (PSP) device"
 	default y
 	depends on CRYPTO_DEV_CCP_DD && X86_64 && AMD_IOMMU
+	select PCI_TSM
 	help
 	 Provide support for the AMD Platform Security Processor (PSP).
 	 The PSP is a dedicated processor that provides support for key

drivers/crypto/ccp/Makefile

@@ -16,6 +16,10 @@ ccp-$(CONFIG_CRYPTO_DEV_SP_PSP) += psp-dev.o \
                                    hsti.o \
                                    sfs.o
 
+ifeq ($(CONFIG_PCI_TSM),y)
+ccp-$(CONFIG_CRYPTO_DEV_SP_PSP) += sev-dev-tsm.o sev-dev-tio.o
+endif
+
 obj-$(CONFIG_CRYPTO_DEV_CCP_CRYPTO) += ccp-crypto.o
 ccp-crypto-objs := ccp-crypto-main.o \
 		   ccp-crypto-aes.o \