Commit 38fe3975 authored by Brett Creeley's avatar Brett Creeley Committed by Alex Williamson
Browse files

vfio/pds: Initial support for pds VFIO driver 



This is the initial framework for the new pds-vfio-pci device driver.
This does the very basics of registering the PDS PCI device and
configuring it as a VFIO PCI device.

With this change, the VF device can be bound to the pds-vfio-pci driver
on the host and presented to the VM as an ethernet VF.

Signed-off-by: default avatarBrett Creeley <brett.creeley@amd.com>
Signed-off-by: default avatarShannon Nelson <shannon.nelson@amd.com>
Reviewed-by: default avatarSimon Horman <horms@kernel.org>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Reviewed-by: default avatarShameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20230807205755.29579-3-brett.creeley@amd.com


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent 9a4087fa

drivers/vfio/pci/Makefile

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@@ -11,3 +11,5 @@ obj-$(CONFIG_VFIO_PCI) += vfio-pci.o 
obj-$(CONFIG_MLX5_VFIO_PCI)           += mlx5/



obj-$(CONFIG_HISI_ACC_VFIO_PCI) += hisilicon/



obj-$(CONFIG_PDS_VFIO_PCI) += pds/

drivers/vfio/pci/pds/Makefile

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# SPDX-License-Identifier: GPL-2.0

# Copyright (c) 2023 Advanced Micro Devices, Inc.



obj-$(CONFIG_PDS_VFIO_PCI) += pds-vfio-pci.o



pds-vfio-pci-y := \

	pci_drv.o	\

	vfio_dev.o

drivers/vfio/pci/pds/pci_drv.c

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// SPDX-License-Identifier: GPL-2.0

/* Copyright(c) 2023 Advanced Micro Devices, Inc. */



#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt



#include <linux/module.h>

#include <linux/pci.h>

#include <linux/types.h>

#include <linux/vfio.h>



#include <linux/pds/pds_core_if.h>



#include "vfio_dev.h"



#define PDS_VFIO_DRV_DESCRIPTION	"AMD/Pensando VFIO Device Driver"

#define PCI_VENDOR_ID_PENSANDO		0x1dd8



static int pds_vfio_pci_probe(struct pci_dev *pdev,

			      const struct pci_device_id *id)

{

	struct pds_vfio_pci_device *pds_vfio;

	int err;



	pds_vfio = vfio_alloc_device(pds_vfio_pci_device, vfio_coredev.vdev,

				     &pdev->dev, pds_vfio_ops_info());

	if (IS_ERR(pds_vfio))

		return PTR_ERR(pds_vfio);



	dev_set_drvdata(&pdev->dev, &pds_vfio->vfio_coredev);



	err = vfio_pci_core_register_device(&pds_vfio->vfio_coredev);

	if (err)

		goto out_put_vdev;



	return 0;



out_put_vdev:

	vfio_put_device(&pds_vfio->vfio_coredev.vdev);

	return err;

}



static void pds_vfio_pci_remove(struct pci_dev *pdev)

{

	struct pds_vfio_pci_device *pds_vfio = pds_vfio_pci_drvdata(pdev);



	vfio_pci_core_unregister_device(&pds_vfio->vfio_coredev);

	vfio_put_device(&pds_vfio->vfio_coredev.vdev);

}



static const struct pci_device_id pds_vfio_pci_table[] = {

	{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_PENSANDO, 0x1003) }, /* Ethernet VF */

	{ 0, }

};

MODULE_DEVICE_TABLE(pci, pds_vfio_pci_table);



static struct pci_driver pds_vfio_pci_driver = {

	.name = KBUILD_MODNAME,

	.id_table = pds_vfio_pci_table,

	.probe = pds_vfio_pci_probe,

	.remove = pds_vfio_pci_remove,

	.driver_managed_dma = true,

};



module_pci_driver(pds_vfio_pci_driver);



MODULE_DESCRIPTION(PDS_VFIO_DRV_DESCRIPTION);

MODULE_AUTHOR("Brett Creeley <brett.creeley@amd.com>");

MODULE_LICENSE("GPL");

drivers/vfio/pci/pds/vfio_dev.c

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// SPDX-License-Identifier: GPL-2.0

/* Copyright(c) 2023 Advanced Micro Devices, Inc. */



#include <linux/vfio.h>

#include <linux/vfio_pci_core.h>



#include "vfio_dev.h"



struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev)

{

	struct vfio_pci_core_device *core_device = dev_get_drvdata(&pdev->dev);



	return container_of(core_device, struct pds_vfio_pci_device,

			    vfio_coredev);

}



static int pds_vfio_init_device(struct vfio_device *vdev)

{

	struct pds_vfio_pci_device *pds_vfio =

		container_of(vdev, struct pds_vfio_pci_device,

			     vfio_coredev.vdev);

	struct pci_dev *pdev = to_pci_dev(vdev->dev);

	int err, vf_id;



	vf_id = pci_iov_vf_id(pdev);

	if (vf_id < 0)

		return vf_id;



	err = vfio_pci_core_init_dev(vdev);

	if (err)

		return err;



	pds_vfio->vf_id = vf_id;



	return 0;

}



static int pds_vfio_open_device(struct vfio_device *vdev)

{

	struct pds_vfio_pci_device *pds_vfio =

		container_of(vdev, struct pds_vfio_pci_device,

			     vfio_coredev.vdev);

	int err;



	err = vfio_pci_core_enable(&pds_vfio->vfio_coredev);

	if (err)

		return err;



	vfio_pci_core_finish_enable(&pds_vfio->vfio_coredev);



	return 0;

}



static const struct vfio_device_ops pds_vfio_ops = {

	.name = "pds-vfio",

	.init = pds_vfio_init_device,

	.release = vfio_pci_core_release_dev,

	.open_device = pds_vfio_open_device,

	.close_device = vfio_pci_core_close_device,

	.ioctl = vfio_pci_core_ioctl,

	.device_feature = vfio_pci_core_ioctl_feature,

	.read = vfio_pci_core_read,

	.write = vfio_pci_core_write,

	.mmap = vfio_pci_core_mmap,

	.request = vfio_pci_core_request,

	.match = vfio_pci_core_match,

	.bind_iommufd = vfio_iommufd_physical_bind,

	.unbind_iommufd = vfio_iommufd_physical_unbind,

	.attach_ioas = vfio_iommufd_physical_attach_ioas,

};



const struct vfio_device_ops *pds_vfio_ops_info(void)

{

	return &pds_vfio_ops;

}

drivers/vfio/pci/pds/vfio_dev.h

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/* SPDX-License-Identifier: GPL-2.0 */

/* Copyright(c) 2023 Advanced Micro Devices, Inc. */



#ifndef _VFIO_DEV_H_

#define _VFIO_DEV_H_



#include <linux/pci.h>

#include <linux/vfio_pci_core.h>



struct pds_vfio_pci_device {

	struct vfio_pci_core_device vfio_coredev;



	int vf_id;

};



const struct vfio_device_ops *pds_vfio_ops_info(void);

struct pds_vfio_pci_device *pds_vfio_pci_drvdata(struct pci_dev *pdev);



#endif /* _VFIO_DEV_H_ */