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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/vfio.h>
#include <linux/vfio_pci_core.h>
#include <linux/virtio_pci.h>
#include <linux/virtio_net.h>
#include <linux/virtio_pci_admin.h>
#include "common.h"
static int virtiovf_pci_open_device(struct vfio_device *core_vdev)
{
struct virtiovf_pci_core_device *virtvdev = container_of(core_vdev,
struct virtiovf_pci_core_device, core_device.vdev);
struct vfio_pci_core_device *vdev = &virtvdev->core_device;
int ret;
ret = vfio_pci_core_enable(vdev);
if (ret)
return ret;
#ifdef CONFIG_VIRTIO_VFIO_PCI_ADMIN_LEGACY
ret = virtiovf_open_legacy_io(virtvdev);
if (ret) {
vfio_pci_core_disable(vdev);
return ret;
}
#endif
virtiovf_open_migration(virtvdev);
vfio_pci_core_finish_enable(vdev);
return 0;
}
static void virtiovf_pci_close_device(struct vfio_device *core_vdev)
{
struct virtiovf_pci_core_device *virtvdev = container_of(core_vdev,
struct virtiovf_pci_core_device, core_device.vdev);
virtiovf_close_migration(virtvdev);
vfio_pci_core_close_device(core_vdev);
}
#ifdef CONFIG_VIRTIO_VFIO_PCI_ADMIN_LEGACY
static int virtiovf_pci_init_device(struct vfio_device *core_vdev)
{
struct virtiovf_pci_core_device *virtvdev = container_of(core_vdev,
struct virtiovf_pci_core_device, core_device.vdev);
int ret;
ret = vfio_pci_core_init_dev(core_vdev);
if (ret)
return ret;
/*
* The vfio_device_ops.init() callback is set to virtiovf_pci_init_device()
* only when legacy I/O is supported. Now, let's initialize it.
*/
return virtiovf_init_legacy_io(virtvdev);
}
#endif
static void virtiovf_pci_core_release_dev(struct vfio_device *core_vdev)
{
#ifdef CONFIG_VIRTIO_VFIO_PCI_ADMIN_LEGACY
struct virtiovf_pci_core_device *virtvdev = container_of(core_vdev,
struct virtiovf_pci_core_device, core_device.vdev);
virtiovf_release_legacy_io(virtvdev);
#endif
vfio_pci_core_release_dev(core_vdev);
}
static const struct vfio_device_ops virtiovf_vfio_pci_lm_ops = {
.name = "virtio-vfio-pci-lm",
.init = vfio_pci_core_init_dev,
.release = virtiovf_pci_core_release_dev,
.open_device = virtiovf_pci_open_device,
.close_device = virtiovf_pci_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,
.detach_ioas = vfio_iommufd_physical_detach_ioas,
};
#ifdef CONFIG_VIRTIO_VFIO_PCI_ADMIN_LEGACY
static const struct vfio_device_ops virtiovf_vfio_pci_tran_lm_ops = {
.name = "virtio-vfio-pci-trans-lm",
.init = virtiovf_pci_init_device,
.release = virtiovf_pci_core_release_dev,
.open_device = virtiovf_pci_open_device,
.close_device = virtiovf_pci_close_device,
.ioctl = virtiovf_vfio_pci_core_ioctl,
.device_feature = vfio_pci_core_ioctl_feature,
.read = virtiovf_pci_core_read,
.write = virtiovf_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,
.detach_ioas = vfio_iommufd_physical_detach_ioas,
};
#endif
static const struct vfio_device_ops virtiovf_vfio_pci_ops = {
.name = "virtio-vfio-pci",
.init = vfio_pci_core_init_dev,
.release = vfio_pci_core_release_dev,
.open_device = virtiovf_pci_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,
.detach_ioas = vfio_iommufd_physical_detach_ioas,
};
static int virtiovf_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
const struct vfio_device_ops *ops = &virtiovf_vfio_pci_ops;
struct virtiovf_pci_core_device *virtvdev;
bool sup_legacy_io = false;
bool sup_lm = false;
int ret;
if (pdev->is_virtfn) {
#ifdef CONFIG_VIRTIO_VFIO_PCI_ADMIN_LEGACY
sup_legacy_io = virtiovf_support_legacy_io(pdev);
if (sup_legacy_io)
ops = &virtiovf_vfio_pci_tran_lm_ops;
#endif
sup_lm = virtio_pci_admin_has_dev_parts(pdev);
if (sup_lm && !sup_legacy_io)
ops = &virtiovf_vfio_pci_lm_ops;
}
virtvdev = vfio_alloc_device(virtiovf_pci_core_device, core_device.vdev,
&pdev->dev, ops);
if (IS_ERR(virtvdev))
return PTR_ERR(virtvdev);
if (sup_lm)
virtiovf_set_migratable(virtvdev);
dev_set_drvdata(&pdev->dev, &virtvdev->core_device);
ret = vfio_pci_core_register_device(&virtvdev->core_device);
if (ret)
goto out;
return 0;
out:
vfio_put_device(&virtvdev->core_device.vdev);
return ret;
}
static void virtiovf_pci_remove(struct pci_dev *pdev)
{
struct virtiovf_pci_core_device *virtvdev = dev_get_drvdata(&pdev->dev);
vfio_pci_core_unregister_device(&virtvdev->core_device);
vfio_put_device(&virtvdev->core_device.vdev);
}
static const struct pci_device_id virtiovf_pci_table[] = {
/* Only virtio-net is supported/tested so far */
{ PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_REDHAT_QUMRANET, 0x1041) },
{}
};
MODULE_DEVICE_TABLE(pci, virtiovf_pci_table);
static void virtiovf_pci_aer_reset_done(struct pci_dev *pdev)
{
#ifdef CONFIG_VIRTIO_VFIO_PCI_ADMIN_LEGACY
virtiovf_legacy_io_reset_done(pdev);
#endif
virtiovf_migration_reset_done(pdev);
}
static const struct pci_error_handlers virtiovf_err_handlers = {
.reset_done = virtiovf_pci_aer_reset_done,
.error_detected = vfio_pci_core_aer_err_detected,
};
static struct pci_driver virtiovf_pci_driver = {
.name = KBUILD_MODNAME,
.id_table = virtiovf_pci_table,
.probe = virtiovf_pci_probe,
.remove = virtiovf_pci_remove,
.err_handler = &virtiovf_err_handlers,
.driver_managed_dma = true,
};
module_pci_driver(virtiovf_pci_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Yishai Hadas <yishaih@nvidia.com>");
MODULE_DESCRIPTION(
"VIRTIO VFIO PCI - User Level meta-driver for VIRTIO NET devices");
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