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
19 static bool reset_required = true;
20 module_param(reset_required, bool, 0444);
21 MODULE_PARM_DESC(reset_required, "override reset requirement (default: 1)");
22
23 /* probing devices from the linux platform bus */
24
get_platform_resource(struct vfio_platform_device * vdev,int num)25 static 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
get_platform_irq(struct vfio_platform_device * vdev,int i)33 static 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
vfio_platform_init_dev(struct vfio_device * core_vdev)40 static 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
56 static const struct vfio_device_ops vfio_platform_ops;
vfio_platform_probe(struct platform_device * pdev)57 static 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
75 out_put_vdev:
76 vfio_put_device(&vdev->vdev);
77 return ret;
78 }
79
vfio_platform_release_dev(struct vfio_device * core_vdev)80 static 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
vfio_platform_remove(struct platform_device * pdev)88 static 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
97 static 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 .read = vfio_platform_read,
105 .write = vfio_platform_write,
106 .mmap = vfio_platform_mmap,
107 .bind_iommufd = vfio_iommufd_physical_bind,
108 .unbind_iommufd = vfio_iommufd_physical_unbind,
109 .attach_ioas = vfio_iommufd_physical_attach_ioas,
110 .detach_ioas = vfio_iommufd_physical_detach_ioas,
111 };
112
113 static struct platform_driver vfio_platform_driver = {
114 .probe = vfio_platform_probe,
115 .remove_new = vfio_platform_remove,
116 .driver = {
117 .name = "vfio-platform",
118 },
119 .driver_managed_dma = true,
120 };
121
122 module_platform_driver(vfio_platform_driver);
123
124 MODULE_VERSION(DRIVER_VERSION);
125 MODULE_LICENSE("GPL v2");
126 MODULE_AUTHOR(DRIVER_AUTHOR);
127 MODULE_DESCRIPTION(DRIVER_DESC);
128