Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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/pm_runtime.h>
11#include <linux/platform_device.h>
12
13#include "vfio_platform_private.h"
14
15#define DRIVER_VERSION "0.10"
16#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
17#define DRIVER_DESC "VFIO for platform devices - User Level meta-driver"
18
19static bool reset_required = true;
20module_param(reset_required, bool, 0444);
21MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)");
22
23/* probing devices from the linux platform bus */
24
25static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
26 int num)
27{
28 struct platform_device *dev = (struct platform_device *) vdev->opaque;
29
30 return platform_get_mem_or_io(dev, num);
31}
32
33static int get_platform_irq(struct vfio_platform_device *vdev, int i)
34{
35 struct platform_device *pdev = (struct platform_device *) vdev->opaque;
36
37 return platform_get_irq_optional(pdev, i);
38}
39
40static int vfio_platform_init_dev(struct vfio_device *core_vdev)
41{
42 struct vfio_platform_device *vdev =
43 container_of(core_vdev, struct vfio_platform_device, vdev);
44 struct platform_device *pdev = to_platform_device(core_vdev->dev);
45
46 vdev->opaque = (void *) pdev;
47 vdev->name = pdev->name;
48 vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
49 vdev->get_resource = get_platform_resource;
50 vdev->get_irq = get_platform_irq;
51 vdev->reset_required = reset_required;
52
53 return vfio_platform_init_common(vdev);
54}
55
56static const struct vfio_device_ops vfio_platform_ops;
57static int vfio_platform_probe(struct platform_device *pdev)
58{
59 struct vfio_platform_device *vdev;
60 int ret;
61
62 vdev = vfio_alloc_device(vfio_platform_device, vdev, &pdev->dev,
63 &vfio_platform_ops);
64 if (IS_ERR(vdev))
65 return PTR_ERR(vdev);
66
67 ret = vfio_register_group_dev(&vdev->vdev);
68 if (ret)
69 goto out_put_vdev;
70
71 pm_runtime_enable(&pdev->dev);
72 dev_set_drvdata(&pdev->dev, vdev);
73 return 0;
74
75out_put_vdev:
76 vfio_put_device(&vdev->vdev);
77 return ret;
78}
79
80static void vfio_platform_release_dev(struct vfio_device *core_vdev)
81{
82 struct vfio_platform_device *vdev =
83 container_of(core_vdev, struct vfio_platform_device, vdev);
84
85 vfio_platform_release_common(vdev);
86}
87
88static void vfio_platform_remove(struct platform_device *pdev)
89{
90 struct vfio_platform_device *vdev = dev_get_drvdata(&pdev->dev);
91
92 vfio_unregister_group_dev(&vdev->vdev);
93 pm_runtime_disable(vdev->device);
94 vfio_put_device(&vdev->vdev);
95}
96
97static const struct vfio_device_ops vfio_platform_ops = {
98 .name = "vfio-platform",
99 .init = vfio_platform_init_dev,
100 .release = vfio_platform_release_dev,
101 .open_device = vfio_platform_open_device,
102 .close_device = vfio_platform_close_device,
103 .ioctl = vfio_platform_ioctl,
104 .get_region_info_caps = vfio_platform_ioctl_get_region_info,
105 .read = vfio_platform_read,
106 .write = vfio_platform_write,
107 .mmap = vfio_platform_mmap,
108 .bind_iommufd = vfio_iommufd_physical_bind,
109 .unbind_iommufd = vfio_iommufd_physical_unbind,
110 .attach_ioas = vfio_iommufd_physical_attach_ioas,
111 .detach_ioas = vfio_iommufd_physical_detach_ioas,
112};
113
114static struct platform_driver vfio_platform_driver = {
115 .probe = vfio_platform_probe,
116 .remove = vfio_platform_remove,
117 .driver = {
118 .name = "vfio-platform",
119 },
120 .driver_managed_dma = true,
121};
122
123module_platform_driver(vfio_platform_driver);
124
125MODULE_VERSION(DRIVER_VERSION);
126MODULE_LICENSE("GPL v2");
127MODULE_AUTHOR(DRIVER_AUTHOR);
128MODULE_DESCRIPTION(DRIVER_DESC);