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
get_amba_resource(struct vfio_platform_device * vdev,int i)21 static 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
get_amba_irq(struct vfio_platform_device * vdev,int i)32 static 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
vfio_amba_init_dev(struct vfio_device * core_vdev)44 static 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
67 static const struct vfio_device_ops vfio_amba_ops;
vfio_amba_probe(struct amba_device * adev,const struct amba_id * id)68 static 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 vdev = vfio_alloc_device(vfio_platform_device, vdev, &adev->dev,
74 &vfio_amba_ops);
75 if (IS_ERR(vdev))
76 return PTR_ERR(vdev);
77
78 ret = vfio_register_group_dev(&vdev->vdev);
79 if (ret)
80 goto out_put_vdev;
81
82 pm_runtime_enable(&adev->dev);
83 dev_set_drvdata(&adev->dev, vdev);
84 return 0;
85
86 out_put_vdev:
87 vfio_put_device(&vdev->vdev);
88 return ret;
89 }
90
vfio_amba_release_dev(struct vfio_device * core_vdev)91 static void vfio_amba_release_dev(struct vfio_device *core_vdev)
92 {
93 struct vfio_platform_device *vdev =
94 container_of(core_vdev, struct vfio_platform_device, vdev);
95
96 vfio_platform_release_common(vdev);
97 kfree(vdev->name);
98 }
99
vfio_amba_remove(struct amba_device * adev)100 static void vfio_amba_remove(struct amba_device *adev)
101 {
102 struct vfio_platform_device *vdev = dev_get_drvdata(&adev->dev);
103
104 vfio_unregister_group_dev(&vdev->vdev);
105 pm_runtime_disable(vdev->device);
106 vfio_put_device(&vdev->vdev);
107 }
108
109 static const struct vfio_device_ops vfio_amba_ops = {
110 .name = "vfio-amba",
111 .init = vfio_amba_init_dev,
112 .release = vfio_amba_release_dev,
113 .open_device = vfio_platform_open_device,
114 .close_device = vfio_platform_close_device,
115 .ioctl = vfio_platform_ioctl,
116 .read = vfio_platform_read,
117 .write = vfio_platform_write,
118 .mmap = vfio_platform_mmap,
119 .bind_iommufd = vfio_iommufd_physical_bind,
120 .unbind_iommufd = vfio_iommufd_physical_unbind,
121 .attach_ioas = vfio_iommufd_physical_attach_ioas,
122 .detach_ioas = vfio_iommufd_physical_detach_ioas,
123 };
124
125 static const struct amba_id pl330_ids[] = {
126 { 0, 0 },
127 };
128
129 MODULE_DEVICE_TABLE(amba, pl330_ids);
130
131 static struct amba_driver vfio_amba_driver = {
132 .probe = vfio_amba_probe,
133 .remove = vfio_amba_remove,
134 .id_table = pl330_ids,
135 .drv = {
136 .name = "vfio-amba",
137 .owner = THIS_MODULE,
138 },
139 .driver_managed_dma = true,
140 };
141
142 module_amba_driver(vfio_amba_driver);
143
144 MODULE_VERSION(DRIVER_VERSION);
145 MODULE_LICENSE("GPL v2");
146 MODULE_AUTHOR(DRIVER_AUTHOR);
147 MODULE_DESCRIPTION(DRIVER_DESC);
148