[RFC PATCH 7/7] tsm: Add secure SPDM support

["Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>]

Add secure doe mailbox support

Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
---
 drivers/pci/tsm.c       | 24 +++++++++++++++++++-----
 include/linux/pci-tsm.h |  1 +
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/tsm.c b/drivers/pci/tsm.c
index 3251dc5eeef8..cb251497ca68 100644
--- a/drivers/pci/tsm.c
+++ b/drivers/pci/tsm.c
@@ -194,12 +194,16 @@ static void __pci_tsm_init(struct pci_dev *pdev)
 		return;
 
 	mutex_init(&pci_tsm->lock);
-	pci_tsm->doe_mb = pci_find_doe_mailbox(pdev, PCI_VENDOR_ID_PCI_SIG,
+	pci_tsm->doe_mb 	= pci_find_doe_mailbox(pdev, PCI_VENDOR_ID_PCI_SIG,
 					       PCI_DOE_PROTO_CMA);
-	pci_info(pdev, "Device security capabilities detected (%s%s%s)\n",
+	pci_tsm->doe_secure_mb 	= pci_find_doe_mailbox(pdev, PCI_VENDOR_ID_PCI_SIG,
+					       PCI_DOE_PROTO_SSESSION);
+
+	pci_info(pdev, "Device security capabilities detected (%s%s%s%s)\n",
 		 pdev->ide_cap ? " ide" : "",
 		 tee_cap ? " tee" : "",
-		 pci_tsm->doe_mb ? " doe" : "");
+		 pci_tsm->doe_mb ? " doe" : "",
+		 pci_tsm->doe_secure_mb ? " secure-doe" : "");
 
 	pci_tsm->state = PCI_TSM_INIT;
 	pci_tsm->dsm = no_free_ptr(dsm);
@@ -277,10 +281,20 @@ int pci_tsm_doe_transfer(struct pci_dev *pdev, enum pci_doe_proto type,
 			 const void *req, size_t req_sz, void *resp,
 			 size_t resp_sz)
 {
-	if (!pdev->tsm || !pdev->tsm->doe_mb)
+	struct pci_doe_mb *mb = NULL;
+
+	if (!pdev->tsm)
+		return -ENXIO;
+
+	if (type == PCI_DOE_PROTO_CMA)
+		mb = pdev->tsm->doe_mb;
+	else if (type == PCI_DOE_PROTO_SSESSION)
+		mb = pdev->tsm->doe_secure_mb;
+
+	if (!mb)
 		return -ENXIO;
 
-	return pci_doe(pdev->tsm->doe_mb, PCI_VENDOR_ID_PCI_SIG, type, req,
+	return pci_doe(mb, PCI_VENDOR_ID_PCI_SIG, type, req,
 		       req_sz, resp, resp_sz);
 }
 EXPORT_SYMBOL_GPL(pci_tsm_doe_transfer);
diff --git a/include/linux/pci-tsm.h b/include/linux/pci-tsm.h
index 6ad2081a329d..815da9c3fc50 100644
--- a/include/linux/pci-tsm.h
+++ b/include/linux/pci-tsm.h
@@ -34,6 +34,7 @@ struct pci_tsm {
 	enum pci_tsm_state state;
 	struct mutex lock;
 	struct pci_doe_mb *doe_mb;
+	struct pci_doe_mb *doe_secure_mb;
 	struct pci_dsm *dsm;
 };
 
-- 
2.43.0