linux-kernel - [PATCH 6/9] vfio-pci-core: export vfio_pci_register_dev

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Date:   Tue, 9 Mar 2021 08:33:54 +0000
From:   Max Gurtovoy <mgurtovoy@...dia.com>
To:     <jgg@...dia.com>, <alex.williamson@...hat.com>,
        <cohuck@...hat.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <liranl@...dia.com>, <oren@...dia.com>, <tzahio@...dia.com>,
        <leonro@...dia.com>, <yarong@...dia.com>, <aviadye@...dia.com>,
        <shahafs@...dia.com>, <artemp@...dia.com>, <kwankhede@...dia.com>,
        <ACurrid@...dia.com>, <cjia@...dia.com>, <yishaih@...dia.com>,
        <mjrosato@...ux.ibm.com>, <aik@...abs.ru>, <hch@....de>,
        Max Gurtovoy <mgurtovoy@...dia.com>
Subject: [PATCH 6/9] vfio-pci-core: export vfio_pci_register_dev_region function

This function will be used to allow vendor drivers to register regions
to be used and accessed by the core subsystem driver. This way, the core
will use the region ops that are vendor specific and managed by the
vendor vfio-pci driver.

Next step that can be made is to move the logic of igd and nvlink2 to a
dedicated module instead of managing their vendor specific extensions in
the core driver.

Signed-off-by: Max Gurtovoy <mgurtovoy@...dia.com>
---
 drivers/vfio/pci/vfio_pci_core.c | 1 +
 drivers/vfio/pci/vfio_pci_core.h | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index 7b6be1e4646f..ba5dd4321487 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -711,6 +711,7 @@ int vfio_pci_register_dev_region(struct vfio_pci_core_device *vdev,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(vfio_pci_register_dev_region);
 
 struct vfio_devices {
 	struct vfio_device **devices;
diff --git a/drivers/vfio/pci/vfio_pci_core.h b/drivers/vfio/pci/vfio_pci_core.h
index 46eb3443125b..60b42df6c519 100644
--- a/drivers/vfio/pci/vfio_pci_core.h
+++ b/drivers/vfio/pci/vfio_pci_core.h
@@ -257,4 +257,9 @@ int vfio_pci_core_sriov_configure(struct pci_dev *pdev, int nr_virtfn);
 
 extern const struct pci_error_handlers vfio_pci_core_err_handlers;
 
+int vfio_pci_register_dev_region(struct vfio_pci_core_device *vdev,
+		unsigned int type, unsigned int subtype,
+		const struct vfio_pci_regops *ops,
+		size_t size, u32 flags, void *data);
+
 #endif /* VFIO_PCI_CORE_H */
-- 
2.25.4