Subject: [RFC PATCH v4 14/14] coco: host: arm64: Add NCOH_SYS stream support for RC endpoints

From: "Aneesh Kumar K.V (Arm)" <[email-masked]>
Date: Mon, 27 Apr 2026 12:21:21 +0530

Teach the host CCA pdev setup to handle PCI_EXP_TYPE_RC_END devices.

Classify RC integrated endpoints as RMI_PDEV_FLAGS_CATEGORY_ON_CHIP_EP when
building the RMM pdev parameters, and only advertise SPDM support when a
DOE mailbox is present.

Also add the stream setup path for these devices by creating an
RMI_PDEV_STREAM_NCOH_SYS stream using the endpoint pdev and its bridge
address windows. This allows RC endpoints to participate in the TDISP flow
without requiring a separate root-port pdev.

Signed-off-by: Aneesh Kumar K.V (Arm) <[email-masked]>
---
 drivers/virt/coco/arm-cca-host/arm-cca.c | 28 ++++++++++++++++++++++++
 drivers/virt/coco/arm-cca-host/rmi-da.c  | 10 +++++++++
 2 files changed, 38 insertions(+)

diff --git a/drivers/virt/coco/arm-cca-host/arm-cca.c b/drivers/virt/coco/arm-cca-host/arm-cca.c
index 265aa0cb612a..8b1182620872 100644
--- a/drivers/virt/coco/arm-cca-host/arm-cca.c
+++ b/drivers/virt/coco/arm-cca-host/arm-cca.c
@@ -277,11 +277,39 @@ static int cca_pdev_create_ncoh_stream(struct pci_dev *pdev, unsigned long strea
 	return ret;
 }
 
+static int cca_pdev_create_ncoh_sys_stream(struct pci_dev *pdev)
+{
+	int ret;
+	long stream_handle;
+	struct rmi_pdev_stream_params *params;
+	struct cca_host_pf0_ep_dsc *pf0_ep_dsc = to_cca_pf0_ep_dsc(pdev);
+
+	params = (struct rmi_pdev_stream_params *)get_zeroed_page(GFP_KERNEL);
+	if (!params)
+		return -ENOMEM;
+
+	params->flags = 0;
+	params->type = RMI_PDEV_STREAM_NCOH_SYS;
+	params->pdev_1 = virt_to_phys(pf0_ep_dsc->pdev.rmm_pdev);
+	params->pdev_2 = 0; /* ignored */
+	params->ide_sid = 0; /* ignored */
+	params->num_addr_range = pci_dev_addr_range(pdev, params->addr_range);
+
+	ret = cca_pdev_stream_connect(pdev, NULL, params, &stream_handle);
+	if (!ret)
+		pf0_ep_dsc->stream_handle = stream_handle;
+
+	free_page((unsigned long)params);
+	return ret;
+}
+
 static int cca_pdev_create_streams(struct pci_dev *pdev, unsigned long stream_id)
 {
 	switch (pci_pcie_type(pdev)) {
 	case PCI_EXP_TYPE_ENDPOINT:
 		return cca_pdev_create_ncoh_stream(pdev, stream_id);
+	case PCI_EXP_TYPE_RC_END:
+		return cca_pdev_create_ncoh_sys_stream(pdev);
 	default:
 		return -EINVAL;
 	}
diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.c b/drivers/virt/coco/arm-cca-host/rmi-da.c
index a10ac6ff03d1..33a2551fd09f 100644
--- a/drivers/virt/coco/arm-cca-host/rmi-da.c
+++ b/drivers/virt/coco/arm-cca-host/rmi-da.c
@@ -66,6 +66,16 @@ static int init_pdev_params(struct pci_dev *pdev, struct rmi_pdev_params *params
 		category = RMI_PDEV_FLAGS_CATEGORY_ROOT_PORT;
 		break;
 	}
+	case PCI_EXP_TYPE_RC_END: {
+		struct cca_host_pf0_ep_dsc *pf0_ep_dsc = to_cca_pf0_ep_dsc(pdev);
+
+		/* Use SPDM if present */
+		if (pf0_ep_dsc->pci.doe_mb)
+			params->flags = RMI_PDEV_FLAGS_SPDM;
+
+		category = RMI_PDEV_FLAGS_CATEGORY_ON_CHIP_EP;
+		break;
+	}
 	default:
 		return -EINVAL;
 	}
-- 
2.43.0