linux-kernel - [PATCH v2 1/5] bus: mhi: host: Add support for separate controller configurations for VF and PF

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Message-ID: <20250710-sriov_vdev_next-20250630-v2-1-4bd862b822e8@quicinc.com>
Date: Thu, 10 Jul 2025 14:28:32 +0530
From: Vivek.Pernamitta@...cinc.com
To: Manivannan Sadhasivam <mani@...nel.org>
CC: <mhi@...ts.linux.dev>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Vivek Pernamitta <quic_vpernami@...cinc.com>,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Subject: [PATCH v2 1/5] bus: mhi: host: Add support for separate controller
 configurations for VF and PF

From: Vivek Pernamitta <quic_vpernami@...cinc.com>

Implement support for separate controller configurations for both
Virtual Functions (VF) and Physical Functions (PF).

This enhancement allows for more flexible and efficient management of
resources. The PF takes on a supervisory role and will have bootup
information such as SAHARA, DIAG, and NDB (for file system sync data,
etc.). VFs can handle resources associated with the main data movement
of the Function are available to the SI (system image) as per PCIe SRIOV
spec (rev 0.9 1.Architectural overview)

Signed-off-by: Vivek Pernamitta <quic_vpernami@...cinc.com>
Reviewed-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
 drivers/bus/mhi/host/pci_generic.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
index 5c01c23d0bcfedd23f975e99845d5fa88940ccde..7d0ac1c34ddf95ace2a85e5f08884f51604d9b0f 100644
--- a/drivers/bus/mhi/host/pci_generic.c
+++ b/drivers/bus/mhi/host/pci_generic.c
@@ -34,6 +34,7 @@
 /**
  * struct mhi_pci_dev_info - MHI PCI device specific information
  * @config: MHI controller configuration
+ * @vf_config: MHI controller configuration for Virtual function (optional)
  * @name: name of the PCI module
  * @fw: firmware path (if any)
  * @edl: emergency download mode firmware path (if any)
@@ -47,6 +48,7 @@
  */
 struct mhi_pci_dev_info {
 	const struct mhi_controller_config *config;
+	const struct mhi_controller_config *vf_config;
 	const char *name;
 	const char *fw;
 	const char *edl;
@@ -1242,9 +1244,14 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		return -ENOMEM;
 
 	INIT_WORK(&mhi_pdev->recovery_work, mhi_pci_recovery_work);
+
+	if (pdev->is_virtfn && info->vf_config)
+		mhi_cntrl_config = info->vf_config;
+	else
+		mhi_cntrl_config = info->config;
+
 	timer_setup(&mhi_pdev->health_check_timer, health_check, 0);
 
-	mhi_cntrl_config = info->config;
 	mhi_cntrl = &mhi_pdev->mhi_cntrl;
 
 	mhi_cntrl->cntrl_dev = &pdev->dev;

-- 
2.34.1