Re: [PATCH v2 00/19] PCI/TSM: TEE I/O infrastructure

[Aneesh Kumar K.V <aneesh.kumar@kernel.org>]

Dan Williams <dan.j.williams@intel.com> writes:

....

To support devices without  IDE/DOE support we need something similar. 

modified   drivers/pci/tsm/core.c
@@ -1236,12 +1236,14 @@ int pci_tsm_pf0_constructor(struct pci_dev *pdev, struct pci_tsm_pf0 *tsm,
 			    struct tsm_dev *tsm_dev)
 {
 	mutex_init(&tsm->lock);
-	tsm->doe_mb = pci_find_doe_mailbox(pdev, PCI_VENDOR_ID_PCI_SIG,
-					   PCI_DOE_FEATURE_CMA);
-	if (!tsm->doe_mb) {
-		pci_warn(pdev, "TSM init failure, no CMA mailbox\n");
-		return -ENODEV;
-	}
+
+       /*
+        * Note, low-level TSM driver responsible for determining if it wants to
+        * proceed with a device that has no DOE mailbox. TSM may have an
+        * alternate method for coordinating TDISP.
+        */
+       if (!tsm->doe_mb)
+               pci_dbg(pdev, "no CMA mailbox\n");
 
 	return pci_tsm_link_constructor(pdev, &tsm->base_tsm, tsm_dev);
 }