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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013 - Virtual Open Systems
* Author: Antonios Motakis <a.motakis@virtualopensystems.com>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vfio.h>
#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include "vfio_platform_private.h"
#define DRIVER_VERSION "0.10"
#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
#define DRIVER_DESC "VFIO for platform devices - User Level meta-driver"
static bool reset_required = true;
module_param(reset_required, bool, 0444);
MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)");
/* probing devices from the linux platform bus */
static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
int num)
{
struct platform_device *dev = (struct platform_device *) vdev->opaque;
return platform_get_mem_or_io(dev, num);
}
static int get_platform_irq(struct vfio_platform_device *vdev, int i)
{
struct platform_device *pdev = (struct platform_device *) vdev->opaque;
return platform_get_irq_optional(pdev, i);
}
static int vfio_platform_init_dev(struct vfio_device *core_vdev)
{
struct vfio_platform_device *vdev =
container_of(core_vdev, struct vfio_platform_device, vdev);
struct platform_device *pdev = to_platform_device(core_vdev->dev);
vdev->opaque = (void *) pdev;
vdev->name = pdev->name;
vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
vdev->get_resource = get_platform_resource;
vdev->get_irq = get_platform_irq;
vdev->reset_required = reset_required;
return vfio_platform_init_common(vdev);
}
static const struct vfio_device_ops vfio_platform_ops;
static int vfio_platform_probe(struct platform_device *pdev)
{
struct vfio_platform_device *vdev;
int ret;
vdev = vfio_alloc_device(vfio_platform_device, vdev, &pdev->dev,
&vfio_platform_ops);
if (IS_ERR(vdev))
return PTR_ERR(vdev);
ret = vfio_register_group_dev(&vdev->vdev);
if (ret)
goto out_put_vdev;
pm_runtime_enable(&pdev->dev);
dev_set_drvdata(&pdev->dev, vdev);
return 0;
out_put_vdev:
vfio_put_device(&vdev->vdev);
return ret;
}
static void vfio_platform_release_dev(struct vfio_device *core_vdev)
{
struct vfio_platform_device *vdev =
container_of(core_vdev, struct vfio_platform_device, vdev);
vfio_platform_release_common(vdev);
vfio_free_device(core_vdev);
}
static int vfio_platform_remove(struct platform_device *pdev)
{
struct vfio_platform_device *vdev = dev_get_drvdata(&pdev->dev);
vfio_unregister_group_dev(&vdev->vdev);
pm_runtime_disable(vdev->device);
vfio_put_device(&vdev->vdev);
return 0;
}
static const struct vfio_device_ops vfio_platform_ops = {
.name = "vfio-platform",
.init = vfio_platform_init_dev,
.release = vfio_platform_release_dev,
.open_device = vfio_platform_open_device,
.close_device = vfio_platform_close_device,
.ioctl = vfio_platform_ioctl,
.read = vfio_platform_read,
.write = vfio_platform_write,
.mmap = vfio_platform_mmap,
};
static struct platform_driver vfio_platform_driver = {
.probe = vfio_platform_probe,
.remove = vfio_platform_remove,
.driver = {
.name = "vfio-platform",
},
.driver_managed_dma = true,
};
module_platform_driver(vfio_platform_driver);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
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