linux-kernel - [PATCH v3 1/6] bus: mhi: host: Add support for separate controller configurations for VF and PF

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Message-ID: <20250821-vdev_next-20250821_sriov-v3-1-e1b017c48d4a@quicinc.com>
Date: Thu, 21 Aug 2025 18:25:33 +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 v3 1/6] 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 4edb5bb476baf02af02aed00be0d6bacf9e92634..2967ed4cec29d1c1eeb581ed44cf9afcea90f533 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;
@@ -1311,9 +1313,14 @@ 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