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/pm_runtime.h>
11#include <linux/amba/bus.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 AMBA devices - User Level meta-driver"
18
19/* probing devices from the AMBA bus */
20
21static struct resource *get_amba_resource(struct vfio_platform_device *vdev,
22 int i)
23{
24 struct amba_device *adev = (struct amba_device *) vdev->opaque;
25
26 if (i == 0)
27 return &adev->res;
28
29 return NULL;
30}
31
32static int get_amba_irq(struct vfio_platform_device *vdev, int i)
33{
34 struct amba_device *adev = (struct amba_device *) vdev->opaque;
35 int ret = 0;
36
37 if (i < AMBA_NR_IRQS)
38 ret = adev->irq[i];
39
40 /* zero is an unset IRQ for AMBA devices */
41 return ret ? ret : -ENXIO;
42}
43
44static int vfio_amba_init_dev(struct vfio_device *core_vdev)
45{
46 struct vfio_platform_device *vdev =
47 container_of(core_vdev, struct vfio_platform_device, vdev);
48 struct amba_device *adev = to_amba_device(core_vdev->dev);
49 int ret;
50
51 vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
52 if (!vdev->name)
53 return -ENOMEM;
54
55 vdev->opaque = (void *) adev;
56 vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
57 vdev->get_resource = get_amba_resource;
58 vdev->get_irq = get_amba_irq;
59 vdev->reset_required = false;
60
61 ret = vfio_platform_init_common(vdev);
62 if (ret)
63 kfree(vdev->name);
64 return ret;
65}
66
67static const struct vfio_device_ops vfio_amba_ops;
68static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
69{
70 struct vfio_platform_device *vdev;
71 int ret;
72
73 dev_err_once(&adev->dev, "DEPRECATION: vfio-amba is deprecated and will be removed in a future kernel release\n");
74
75 vdev = vfio_alloc_device(vfio_platform_device, vdev, &adev->dev,
76 &vfio_amba_ops);
77 if (IS_ERR(vdev))
78 return PTR_ERR(vdev);
79
80 ret = vfio_register_group_dev(&vdev->vdev);
81 if (ret)
82 goto out_put_vdev;
83
84 pm_runtime_enable(&adev->dev);
85 dev_set_drvdata(&adev->dev, vdev);
86 return 0;
87
88out_put_vdev:
89 vfio_put_device(&vdev->vdev);
90 return ret;
91}
92
93static void vfio_amba_release_dev(struct vfio_device *core_vdev)
94{
95 struct vfio_platform_device *vdev =
96 container_of(core_vdev, struct vfio_platform_device, vdev);
97
98 vfio_platform_release_common(vdev);
99 kfree(vdev->name);
100}
101
102static void vfio_amba_remove(struct amba_device *adev)
103{
104 struct vfio_platform_device *vdev = dev_get_drvdata(&adev->dev);
105
106 vfio_unregister_group_dev(&vdev->vdev);
107 pm_runtime_disable(vdev->device);
108 vfio_put_device(&vdev->vdev);
109}
110
111static const struct vfio_device_ops vfio_amba_ops = {
112 .name = "vfio-amba",
113 .init = vfio_amba_init_dev,
114 .release = vfio_amba_release_dev,
115 .open_device = vfio_platform_open_device,
116 .close_device = vfio_platform_close_device,
117 .ioctl = vfio_platform_ioctl,
118 .get_region_info_caps = vfio_platform_ioctl_get_region_info,
119 .read = vfio_platform_read,
120 .write = vfio_platform_write,
121 .mmap = vfio_platform_mmap,
122 .bind_iommufd = vfio_iommufd_physical_bind,
123 .unbind_iommufd = vfio_iommufd_physical_unbind,
124 .attach_ioas = vfio_iommufd_physical_attach_ioas,
125 .detach_ioas = vfio_iommufd_physical_detach_ioas,
126};
127
128static const struct amba_id vfio_amba_ids[] = {
129 { 0, 0 },
130};
131
132MODULE_DEVICE_TABLE(amba, vfio_amba_ids);
133
134static struct amba_driver vfio_amba_driver = {
135 .probe = vfio_amba_probe,
136 .remove = vfio_amba_remove,
137 .id_table = vfio_amba_ids,
138 .drv = {
139 .name = "vfio-amba",
140 },
141 .driver_managed_dma = true,
142};
143
144module_amba_driver(vfio_amba_driver);
145
146MODULE_VERSION(DRIVER_VERSION);
147MODULE_LICENSE("GPL v2");
148MODULE_AUTHOR(DRIVER_AUTHOR);
149MODULE_DESCRIPTION(DRIVER_DESC);