[RFC PATCH 3/4] PCI/CMA: Initial support for Component Measurement and Authentication ECN

[Jonathan Cameron <Jonathan.Cameron@huawei.com>]

This currently very much a PoC.  Currently the SPDM library only provides
a single function to allow a challenge / authentication of the PCI EP.

SPDM exchanges must occur in one of a small set of valid squences over
which the message digest used in authentication is built up.
Placing that complexity in the SPDM library seems like a good way
to enforce that logic, without having to do it for each transport.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/pci/Kconfig     | 9 +++++++++
 drivers/pci/Makefile    | 1 +
 drivers/pci/doe.c       | 2 --
 include/linux/pci-doe.h | 2 ++
 4 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index a30c59cf5e27..43e3b0d5e8cd 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -198,6 +198,15 @@ config PCI_DOE
 	  used by a number of different protocols.
 	  DOE is defined in the Data Object Exchange ECN to the PCIe r5.0 spec.
 
+config PCI_CMA
+	tristate
+	select PCI_DOE
+	select ASN1_ENCODER
+	select SPDM
+	help
+	  This enables library support for the PCI Component Measurement and
+	  Authentication ECN. This uses DMTF SPDM 1.1
+
 choice
 	prompt "PCI Express hierarchy optimization setting"
 	default PCIE_BUS_DEFAULT
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 1b61c1a1c232..3f6b3543d565 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_PCI_PF_STUB)	+= pci-pf-stub.o
 obj-$(CONFIG_PCI_ECAM)		+= ecam.o
 obj-$(CONFIG_PCI_P2PDMA)	+= p2pdma.o
 obj-$(CONFIG_PCI_DOE)		+= doe.o
+obj-$(CONFIG_PCI_CMA)		+= cma.o
 obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += xen-pcifront.o
 
 # Endpoint library must be initialized before its users
diff --git a/drivers/pci/doe.c b/drivers/pci/doe.c
index 2d20f59e42c6..f6aaeed01010 100644
--- a/drivers/pci/doe.c
+++ b/drivers/pci/doe.c
@@ -20,8 +20,6 @@
 /* Maximum number of DOE instances in the system */
 #define PCI_DOE_MAX_CNT 65536
 
-#define PCI_DOE_PROTOCOL_DISCOVERY 0
-
 #define PCI_DOE_BUSY_MAX_RETRIES 16
 #define PCI_DOE_POLL_INTERVAL (HZ / 128)
 
diff --git a/include/linux/pci-doe.h b/include/linux/pci-doe.h
index bdc5f15f14ab..1347c124ed70 100644
--- a/include/linux/pci-doe.h
+++ b/include/linux/pci-doe.h
@@ -19,6 +19,8 @@ struct pci_doe_prot {
 	u8 type;
 };
 
+#define PCI_DOE_PROTOCOL_DISCOVERY 0
+#define PCI_DOE_PROTOCOL_CMA 1
 struct workqueue_struct;
 
 enum pci_doe_state {
-- 
2.19.1