vfio: platform: probe to devices on the platform bus

/*

 * Copyright (C) 2013 - Virtual Open Systems

 * Author: Antonios Motakis <a.motakis@virtualopensystems.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License, version 2, as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/vfio.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"

/* 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;

	int i;

	for (i = 0; i < dev->num_resources; i++) {

		struct resource *r = &dev->resource[i];

		if (resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) {

			if (!num)

				return r;

			num--;

		}

	}

	return NULL;

}

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(pdev, i);

}

static int vfio_platform_probe(struct platform_device *pdev)

{

	struct vfio_platform_device *vdev;

	int ret;

	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);

	if (!vdev)

		return -ENOMEM;

	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;

	ret = vfio_platform_probe_common(vdev, &pdev->dev);

	if (ret)

		kfree(vdev);

	return ret;

}

static int vfio_platform_remove(struct platform_device *pdev)

{

	struct vfio_platform_device *vdev;

	vdev = vfio_platform_remove_common(&pdev->dev);

	if (vdev) {

		kfree(vdev);

		return 0;

	}

	return -EINVAL;

}

static struct platform_driver vfio_platform_driver = {

	.probe		= vfio_platform_probe,

	.remove		= vfio_platform_remove,

	.driver	= {

		.name	= "vfio-platform",

		.owner	= THIS_MODULE,

	},

};

module_platform_driver(vfio_platform_driver);

MODULE_VERSION(DRIVER_VERSION);

MODULE_LICENSE("GPL v2");

MODULE_AUTHOR(DRIVER_AUTHOR);

MODULE_DESCRIPTION(DRIVER_DESC);

	__u32	flags;

#define VFIO_DEVICE_FLAGS_RESET	(1 << 0)	/* Device supports reset */

#define VFIO_DEVICE_FLAGS_PCI	(1 << 1)	/* vfio-pci device */

#define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2)	/* vfio-platform device */

	__u32	num_regions;	/* Max region index + 1 */

	__u32	num_irqs;	/* Max IRQ index + 1 */

};