tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2013 - Virtual Open Systems
4 * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
5 */
6
7#include <linux/module.h>
8#include <linux/slab.h>
9#include <linux/vfio.h>
10#include <linux/platform_device.h>
11
12#include "vfio_platform_private.h"
13
14#define DRIVER_VERSION "0.10"
15#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
16#define DRIVER_DESC "VFIO for platform devices - User Level meta-driver"
17
18static bool reset_required = true;
19module_param(reset_required, bool, 0444);
20MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)");
21
22/* probing devices from the linux platform bus */
23
24static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
25 int num)
26{
27 struct platform_device *dev = (struct platform_device *) vdev->opaque;
28
29 return platform_get_mem_or_io(dev, num);
30}
31
32static int get_platform_irq(struct vfio_platform_device *vdev, int i)
33{
34 struct platform_device *pdev = (struct platform_device *) vdev->opaque;
35
36 return platform_get_irq_optional(pdev, i);
37}
38
39static int vfio_platform_probe(struct platform_device *pdev)
40{
41 struct vfio_platform_device *vdev;
42 int ret;
43
44 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
45 if (!vdev)
46 return -ENOMEM;
47
48 vdev->opaque = (void *) pdev;
49 vdev->name = pdev->name;
50 vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
51 vdev->get_resource = get_platform_resource;
52 vdev->get_irq = get_platform_irq;
53 vdev->reset_required = reset_required;
54
55 ret = vfio_platform_probe_common(vdev, &pdev->dev);
56 if (ret) {
57 kfree(vdev);
58 return ret;
59 }
60 dev_set_drvdata(&pdev->dev, vdev);
61 return 0;
62}
63
64static int vfio_platform_remove(struct platform_device *pdev)
65{
66 struct vfio_platform_device *vdev = dev_get_drvdata(&pdev->dev);
67
68 vfio_platform_remove_common(vdev);
69 kfree(vdev);
70 return 0;
71}
72
73static struct platform_driver vfio_platform_driver = {
74 .probe = vfio_platform_probe,
75 .remove = vfio_platform_remove,
76 .driver = {
77 .name = "vfio-platform",
78 },
79};
80
81module_platform_driver(vfio_platform_driver);
82
83MODULE_VERSION(DRIVER_VERSION);
84MODULE_LICENSE("GPL v2");
85MODULE_AUTHOR(DRIVER_AUTHOR);
86MODULE_DESCRIPTION(DRIVER_DESC);